diff --git a/.babelrc b/.babelrc
deleted file mode 100644
index 6c34ee4f..00000000
--- a/.babelrc
+++ /dev/null
@@ -1,13 +0,0 @@
-{
-  "presets": [
-    "env"
-  ],
-  "plugins": [
-    ["transform-runtime", {
-      "helpers": false,
-      "polyfill": true,
-      "regenerator": true,
-      "moduleName": "babel-runtime"
-    }]
-  ]
-}
diff --git a/.gitignore b/.gitignore
index 5349e805..e5ff4b7d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,3 +6,6 @@ jsonata-es5.min.js
 node_modules/
 npm-debug.log
 .idea/
+es2015/
+es5/
+dist/
\ No newline at end of file
diff --git a/test/async-function.js b/__tests__/async-function.ts
similarity index 59%
rename from test/async-function.js
rename to __tests__/async-function.ts
index 55b7216e..60518661 100644
--- a/test/async-function.js
+++ b/__tests__/async-function.ts
@@ -1,14 +1,9 @@
 "use strict";
 
-var jsonata = require('../jsonata');
+var jsonata = require('../src').jsonata;
 var request = require('request');
-//var assert = require('assert');
-var chai = require("chai");
-var expect = chai.expect;
-var chaiAsPromised = require("chai-as-promised");
-chai.use(chaiAsPromised);
 
-var jsonataPromise = function(expr, data, bindings) {
+var jsonataPromise = function(expr, data?, bindings?) {
     return new Promise(function(resolve, reject) {
         expr.evaluate(data, bindings, function(error, response) {
             if(error) reject(error);
@@ -31,10 +26,12 @@ var httpget = function(url) {
 
 describe('Invoke JSONata with callback', function() {
     describe('Make HTTP request', function() {
-        it('should return promise to results', function() {
+        it('should return promise to results', async () => {
             var expr = jsonata('$httpget("https://api.npmjs.org/downloads/range/2016-09-01:2017-03-31/jsonata").downloads{ $substring(day, 0, 7): $sum(downloads) }');
             expr.assign('httpget', httpget);
-            return expect(jsonataPromise(expr)).to.eventually.deep.equal({
+            let result = await jsonataPromise(expr);
+
+            expect(result).toEqual({
                 '2016-09': 205,
                 '2016-10': 1266,
                 '2016-11': 2783,
@@ -49,45 +46,57 @@ describe('Invoke JSONata with callback', function() {
 
 describe('Invoke JSONata with callback - errors', function() {
     describe('type error', function() {
-        it('should throw', function() {
+        it('should throw', async () => {
             var expr = jsonata('5 + $httpget("htttttps://api.npmjs.org/downloads/range/2016-09-01:2017-03-31/jsonata")');
             expr.assign('httpget', httpget);
-            return expect(jsonataPromise(expr)).to.be.rejected;
-            //              .to.deep.contain({position: 7, code: 'T0410', token: 'count', index: 2});;
+            
+            try {
+                await jsonataPromise(expr);
+                expect(undefined).toBeDefined();
+            } catch(e) {
+                // Expected outcome
+            }
         });
-
     });
 
     describe('Make HTTP request with dodgy url', function() {
-        it('should throw', function() {
+        it('should throw', async () => {
             var expr = jsonata('$httpget("htttttps://api.npmjs.org/downloads/range/2016-09-01:2017-03-31/jsonata").downloads{ $substring(day, 0, 7): $sum(downloads) }');
             expr.assign('httpget', httpget);
-            return expect(jsonataPromise(expr)).to.be.rejected;
-            //              .to.deep.contain({position: 7, code: 'T0410', token: 'count', index: 2});;
+            try {
+                await jsonataPromise(expr);
+                expect(undefined).toBeDefined();
+            } catch(e) {
+                // Expected outcome
+            }
         });
     });
 });
 
 describe('Invoke JSONata with callback - return values', function() {
-    it('should handle an undefined value', function() {
+    it('should handle an undefined value', async () => {
         var data = { value: undefined };
         var expr = jsonata('value');
-        return expect(jsonataPromise(expr, data)).to.eventually.equal(undefined);
+        let result = await jsonataPromise(expr, data);
+        expect(result).toEqual(undefined);
     });
-    it('should handle a null value', function() {
+    it('should handle a null value', async() =>  {
         var data = { value: null };
         var expr = jsonata('value');
-        return expect(jsonataPromise(expr, data)).to.eventually.equal(null);
+        let result = await jsonataPromise(expr, data);
+        return expect(result).toEqual(null);
     });
-    it('should handle a value', function() {
+    it('should handle a value', async() =>  {
         var data = { value: 'hello' };
         var expr = jsonata('value');
-        return expect(jsonataPromise(expr, data)).to.eventually.equal('hello');
+        let result = await jsonataPromise(expr, data);
+        return expect(result).toEqual('hello');
     });
-    it('should handle a promise', function() {
+    it('should handle a promise', async() => {
         var data = { value: Promise.resolve('hello') };
         var expr = jsonata('value');
-        return expect(jsonataPromise(expr, data)).to.eventually.equal('hello');
+        let result = await jsonataPromise(expr, data);
+        return expect(result).toEqual('hello');
     });
 });
 
@@ -111,52 +120,65 @@ describe('Handle chained functions that end in promises', function() {
         counter: counter
     };
 
-    it('basic function that returns a thenable', function() {
+    it('basic function that returns a thenable', async() => {
         var data = {};
         var expr = jsonata('$counter(5)');
-        return expect(jsonataPromise(expr, data, bindings)).to.eventually.equal(5);
+        let result = await jsonataPromise(expr, data, bindings);
+        expect(result).toEqual(5);
     });
 
-    it('basic function that returns a thenable, but invokes another function', function() {
+    it('basic function that returns a thenable, but invokes another function', async() =>  {
         var data = {};
         var expr = jsonata('$counter(0).inc()');
-        return expect(jsonataPromise(expr, data, bindings)).to.eventually.equal(1);
+        let result = await jsonataPromise(expr, data, bindings);
+        return expect(result).toEqual(1);
     });
 
-    it('basic function that returns a thenable, but invokes another function several times', function() {
+    it('basic function that returns a thenable, but invokes another function several times', async() =>  {
         var data = {};
         var expr = jsonata('$counter(0).inc().inc().inc().inc()');
-        return expect(jsonataPromise(expr, data, bindings)).to.eventually.equal(4);
+        let result = await jsonataPromise(expr, data, bindings);
+        return expect(result).toEqual(4);
     });
 
-    it('basic function that returns a thenable and part of a numeric expression', function() {
+    it('basic function that returns a thenable and part of a numeric expression', async() =>  {
         var data = {};
         var expr = jsonata('$counter(3) + 5');
-        return expect(jsonataPromise(expr, data, bindings)).to.eventually.equal(8);
+        let result = await jsonataPromise(expr, data, bindings);
+        return expect(result).toEqual(8);
     });
 
-    it('basic function that returns a thenable, but invokes another function several times and part of a numeric expression', function() {
+    it('basic function that returns a thenable, but invokes another function several times and part of a numeric expression', async() =>  {
         var data = {};
         var expr = jsonata('$counter(0).inc().inc().inc().inc() + 3');
-        return expect(jsonataPromise(expr, data, bindings)).to.eventually.equal(7);
+        let result = await jsonataPromise(expr, data, bindings);
+
+        return expect(result).toEqual(7);
     });
 
-    it('basic function that returns a thenable, but invokes another function - nested', function() {
+    it('basic function that returns a thenable, but invokes another function - nested', async() =>  {
         var data = {};
         var expr = jsonata('$counter($counter(3).inc().inc()).inc()');
-        return expect(jsonataPromise(expr, data, bindings)).to.eventually.equal(6);
+        let result = await jsonataPromise(expr, data, bindings);
+        return expect(result).toEqual(6);
     });
 
-    it('basic function that returns a thenable, then invokes a built-in function', function() {
+    it('basic function that returns a thenable, then invokes a built-in function', async() => {
         var data = {};
         var expr = jsonata('$counter(3).inc().$string()');
-        return expect(jsonataPromise(expr, data, bindings)).to.eventually.equal('4');
+        let result = await jsonataPromise(expr, data, bindings);
+        return expect(result).toEqual('4');
     });
 
-    it('basic function that returns a thenable, but invokes a non-existent function', function() {
+    it('basic function that returns a thenable, but invokes a non-existent function', async() => {
         var data = {};
         var expr = jsonata('$counter(2).inc().foo()');
-        return expect(jsonataPromise(expr, data, bindings)).to.be.rejected;
-    });
 
+        try {
+            await jsonataPromise(expr, data, bindings);
+            expect(undefined).toBeDefined();
+        } catch(e) {
+            // Expected outcome
+        }
+    });
 });
\ No newline at end of file
diff --git a/test/implementation-tests.js b/__tests__/implementation-tests.ts
similarity index 76%
rename from test/implementation-tests.js
rename to __tests__/implementation-tests.ts
index 88fed1bc..74bb7c79 100644
--- a/test/implementation-tests.js
+++ b/__tests__/implementation-tests.ts
@@ -10,9 +10,8 @@
 
 "use strict";
 
-var jsonata = require("../jsonata");
-var chai = require("chai");
-var expect = chai.expect;
+var jsonata = require('../src').jsonata;
+import { timeboxExpression } from '../src/utils';
 
 var testdata2 = {
     Account: {
@@ -96,7 +95,7 @@ describe("Functions with side-effects", () => {
                 var result = expr.evaluate(testdata2);
                 // number between 1502264152715 and 2000000000000 (18 May 2033)
                 var expected = result > 1502264152715 && result < 2000000000000;
-                expect(expected).to.deep.equal(true);
+                expect(expected).toEqual(true);
             });
         });
 
@@ -105,7 +104,7 @@ describe("Functions with side-effects", () => {
                 var expr = jsonata('{"now": $millis(), "delay": $sum([1..10000]), "later": $millis()}.(now = later)');
                 var result = expr.evaluate(testdata2);
                 var expected = true;
-                expect(result).to.deep.equal(expected);
+                expect(result).toEqual(expected);
             });
         });
 
@@ -114,7 +113,7 @@ describe("Functions with side-effects", () => {
                 var expr = jsonata("($sum([1..10000]); $millis())");
                 var result = expr.evaluate(testdata2);
                 var result2 = expr.evaluate(testdata2);
-                expect(result).to.not.equal(result2);
+                expect(result).not.toEqual(result2);
             });
         });
     });
@@ -124,9 +123,9 @@ describe("Functions with side-effects", () => {
             var expr = jsonata("$now()");
             var result = expr.evaluate(testdata2);
             // follows this pattern - "2017-05-09T10:10:16.918Z"
-            expect(result).to.match(/^\d\d\d\d-\d\d-\d\dT\d\d:\d\d:\d\d.\d\d\dZ$/);
+            expect(result).toMatch(/^\d\d\d\d-\d\d-\d\dT\d\d:\d\d:\d\d.\d\d\dZ$/);
             // var match = /^\d\d\d\d-\d\d-\d\dT\d\d:\d\d:\d\d.\d\d\dZ$/.test(result);
-            // expect(match).to.deep.equal(true);
+            // expect(match).toEqual(true);
         });
     });
 
@@ -135,7 +134,7 @@ describe("Functions with side-effects", () => {
             var expr = jsonata('{"now": $now(), "delay": $sum([1..10000]), "later": $now()}.(now = later)');
             var result = expr.evaluate(testdata2);
             var expected = true;
-            expect(result).to.deep.equal(expected);
+            expect(result).toEqual(expected);
         });
     });
 
@@ -144,7 +143,7 @@ describe("Functions with side-effects", () => {
             var expr = jsonata("($sum([1..10000]); $now())");
             var result = expr.evaluate(testdata2);
             var result2 = expr.evaluate(testdata2);
-            expect(result).to.not.equal(result2);
+            expect(result).not.toEqual(result2);
         });
     });
 
@@ -154,7 +153,7 @@ describe("Functions with side-effects", () => {
             var result = expr.evaluate(testdata2);
             // number between 1502264152715 and 2000000000000 (18 May 2033)
             var expected = result > 1502264152715 && result < 2000000000000;
-            expect(expected).to.deep.equal(true);
+            expect(expected).toEqual(true);
         });
     });
 
@@ -164,7 +163,7 @@ describe("Functions with side-effects", () => {
                 var expr = jsonata("$random()");
                 var result = expr.evaluate();
                 var expected = result >= 0 && result < 1;
-                expect(true).to.deep.equal(expected);
+                expect(true).toEqual(expected);
             });
         });
 
@@ -173,7 +172,7 @@ describe("Functions with side-effects", () => {
                 var expr = jsonata("$random() = $random()");
                 var result = expr.evaluate();
                 var expected = false;
-                expect(result).to.deep.equal(expected);
+                expect(result).toEqual(expected);
             });
         });
     });
@@ -202,8 +201,8 @@ describe("Tests that bind Javascript functions", () => {
                     }
                 ]
             };
-            expect(result).to.deep.equal(expected);
-            expect(count).to.equal(1);
+            expect(result).toEqual(expected);
+            expect(count).toEqual(1);
         });
     });
 
@@ -215,7 +214,7 @@ describe("Tests that bind Javascript functions", () => {
                 return "time for tea";
             });
             var result = expr.evaluate(testdata2);
-            expect(result).to.equal("time for tea");
+            expect(result).toEqual("time for tea");
         });
     });
 
@@ -231,7 +230,7 @@ describe("Tests that bind Javascript functions", () => {
             );
             var result = expr.evaluate(testdata2);
             var expected = [1, 2, 3, 4];
-            expect(result).to.deep.equal(expected);
+            expect(result).toEqual(expected);
         });
     });
     describe("map a user-defined Javascript function with undefined signature", function() {
@@ -242,7 +241,7 @@ describe("Tests that bind Javascript functions", () => {
             });
             var result = expr.evaluate(testdata2);
             var expected = [1, 2, 3, 4];
-            expect(result).to.deep.equal(expected);
+            expect(result).toEqual(expected);
         });
     });
 
@@ -254,7 +253,7 @@ describe("Tests that bind Javascript functions", () => {
             });
             var result = expr.evaluate(testdata2);
             var expected = [1, 2, 3, 4];
-            expect(result).to.deep.equal(expected);
+            expect(result).toEqual(expected);
         });
     });
     describe("Partially apply user-defined Javascript function", function() {
@@ -271,7 +270,7 @@ describe("Tests that bind Javascript functions", () => {
             });
             var result = expr.evaluate(testdata2);
             var expected = "Hello";
-            expect(result).to.deep.equal(expected);
+            expect(result).toEqual(expected);
         });
     });
 });
@@ -283,7 +282,7 @@ describe("Tests that are specific to a Javascript runtime", () => {
             var expr = jsonata('/ab/ ("ab")');
             var result = expr.evaluate();
             var expected = { match: "ab", start: 0, end: 2, groups: [] };
-            expect(JSON.stringify(result)).to.equal(JSON.stringify(expected));
+            expect(JSON.stringify(result)).toEqual(JSON.stringify(expected));
         });
     });
 
@@ -292,7 +291,7 @@ describe("Tests that are specific to a Javascript runtime", () => {
             var expr = jsonata("/ab/ ()");
             var result = expr.evaluate();
             var expected = undefined;
-            expect(JSON.stringify(result)).to.equal(JSON.stringify(expected));
+            expect(JSON.stringify(result)).toEqual(JSON.stringify(expected));
         });
     });
 
@@ -301,7 +300,7 @@ describe("Tests that are specific to a Javascript runtime", () => {
             var expr = jsonata('/ab+/ ("ababbabbcc")');
             var result = expr.evaluate();
             var expected = { match: "ab", start: 0, end: 2, groups: [] };
-            expect(JSON.stringify(result)).to.equal(JSON.stringify(expected));
+            expect(JSON.stringify(result)).toEqual(JSON.stringify(expected));
         });
     });
 
@@ -310,7 +309,7 @@ describe("Tests that are specific to a Javascript runtime", () => {
             var expr = jsonata('/a(b+)/ ("ababbabbcc")');
             var result = expr.evaluate();
             var expected = { match: "ab", start: 0, end: 2, groups: ["b"] };
-            expect(JSON.stringify(result)).to.equal(JSON.stringify(expected));
+            expect(JSON.stringify(result)).toEqual(JSON.stringify(expected));
         });
     });
 
@@ -319,7 +318,7 @@ describe("Tests that are specific to a Javascript runtime", () => {
             var expr = jsonata('/a(b+)/ ("ababbabbcc").next()');
             var result = expr.evaluate();
             var expected = { match: "abb", start: 2, end: 5, groups: ["bb"] };
-            expect(JSON.stringify(result)).to.equal(JSON.stringify(expected));
+            expect(JSON.stringify(result)).toEqual(JSON.stringify(expected));
         });
     });
 
@@ -328,7 +327,7 @@ describe("Tests that are specific to a Javascript runtime", () => {
             var expr = jsonata('/a(b+)/ ("ababbabbcc").next().next()');
             var result = expr.evaluate();
             var expected = { match: "abb", start: 5, end: 8, groups: ["bb"] };
-            expect(JSON.stringify(result)).to.equal(JSON.stringify(expected));
+            expect(JSON.stringify(result)).toEqual(JSON.stringify(expected));
         });
     });
 
@@ -337,7 +336,7 @@ describe("Tests that are specific to a Javascript runtime", () => {
             var expr = jsonata('/a(b+)/ ("ababbabbcc").next().next().next()');
             var result = expr.evaluate();
             var expected = undefined;
-            expect(JSON.stringify(result)).to.equal(JSON.stringify(expected));
+            expect(JSON.stringify(result)).toEqual(JSON.stringify(expected));
         });
     });
 
@@ -346,29 +345,25 @@ describe("Tests that are specific to a Javascript runtime", () => {
             var expr = jsonata('/a(b+)/i ("Ababbabbcc")');
             var result = expr.evaluate();
             var expected = { match: "Ab", start: 0, end: 2, groups: ["b"] };
-            expect(JSON.stringify(result)).to.equal(JSON.stringify(expected));
+            expect(JSON.stringify(result)).toEqual(JSON.stringify(expected));
         });
     });
 
     describe("empty regex", function() {
         it("should throw error", function() {
-            expect(function() {
+            expectError(() => {
                 var expr = jsonata("//");
-                expr.evaluate();
-            })
-                .to.throw()
-                .to.deep.contain({ position: 1, code: "S0301" });
+                expr.evaluate();                
+            }, {position: 1, code: "S0301"});
         });
     });
 
-    describe("empty regex", function() {
+    describe("incomplete regex", function() {
         it("should throw error", function() {
-            expect(function() {
+            expectError(() => {
                 var expr = jsonata("/");
                 expr.evaluate();
-            })
-                .to.throw()
-                .to.deep.contain({ position: 1, code: "S0302" });
+            }, {position: 1, code: "S0302"});
         });
     });
 
@@ -386,7 +381,7 @@ describe("Tests that are specific to a Javascript runtime", () => {
                     },
                     { match: "ab", index: 5, groups: [] }
                 ];
-                expect(result).to.deep.equal(expected);
+                expect(result).toEqual(expected);
             });
         });
 
@@ -403,7 +398,7 @@ describe("Tests that are specific to a Javascript runtime", () => {
                     },
                     { match: "abb", index: 5, groups: ["bb"] }
                 ];
-                expect(result).to.deep.equal(expected);
+                expect(result).toEqual(expected);
             });
         });
 
@@ -412,7 +407,7 @@ describe("Tests that are specific to a Javascript runtime", () => {
                 var expr = jsonata('$match("ababbabbcc",/a(b+)/, 1)');
                 var result = expr.evaluate();
                 var expected = { match: "ab", index: 0, groups: ["b"] };
-                expect(result).to.deep.equal(expected);
+                expect(result).toEqual(expected);
             });
         });
 
@@ -421,7 +416,7 @@ describe("Tests that are specific to a Javascript runtime", () => {
                 var expr = jsonata('$match("ababbabbcc",/a(b+)/, 0)');
                 var result = expr.evaluate();
                 var expected = undefined;
-                expect(result).to.deep.equal(expected);
+                expect(result).toEqual(expected);
             });
         });
 
@@ -430,7 +425,7 @@ describe("Tests that are specific to a Javascript runtime", () => {
                 var expr = jsonata("$match(nothing,/a(xb+)/)");
                 var result = expr.evaluate();
                 var expected = undefined;
-                expect(result).to.deep.equal(expected);
+                expect(result).toEqual(expected);
             });
         });
 
@@ -439,84 +434,70 @@ describe("Tests that are specific to a Javascript runtime", () => {
                 var expr = jsonata('$match("ababbabbcc",/a(xb+)/)');
                 var result = expr.evaluate();
                 var expected = undefined;
-                expect(result).to.deep.equal(expected);
+                expect(result).toEqual(expected);
             });
         });
 
         describe('$match("a, b, c, d", /ab/, -3)', function() {
             it("should throw error", function() {
                 var expr = jsonata('$match("a, b, c, d", /ab/, -3)');
-                expect(function() {
+                expectError(() => {
                     expr.evaluate();
-                })
-                    .to.throw()
-                    .to.deep.contain({ position: 7, code: "D3040", token: "match", index: 3, value: -3 });
+                }, { position: 7, code: "D3040", token: "match", index: 3, value: -3 });
             });
         });
 
         describe('$match("a, b, c, d", /ab/, null)', function() {
             it("should throw error", function() {
                 var expr = jsonata('$match("a, b, c, d", /ab/, null)');
-                expect(function() {
+                expectError(() => {
                     expr.evaluate();
-                })
-                    .to.throw()
-                    .to.deep.contain({ position: 7, code: "T0410", token: "match", index: 3, value: null });
+                }, { position: 7, code: "T0410", token: "match", index: 3, value: null });
             });
         });
 
         describe('$match("a, b, c, d", /ab/, "2")', function() {
             it("should throw error", function() {
                 var expr = jsonata('$match("a, b, c, d", /ab/, "2")');
-                expect(function() {
+                expectError(() => {
                     expr.evaluate();
-                })
-                    .to.throw()
-                    .to.deep.contain({ position: 7, code: "T0410", token: "match", index: 3, value: "2" });
+                }, { position: 7, code: "T0410", token: "match", index: 3, value: "2" });
             });
         });
 
         describe('$match("a, b, c, d", "ab")', function() {
             it("should throw error", function() {
                 var expr = jsonata('$match("a, b, c, d", "ab")');
-                expect(function() {
+                expectError(() => {
                     expr.evaluate();
-                })
-                    .to.throw()
-                    .to.deep.contain({ position: 7, code: "T0410", token: "match", index: 2, value: "ab" });
+                }, { position: 7, code: "T0410", token: "match", index: 2, value: "ab" });
             });
         });
 
         describe('$match("a, b, c, d", true)', function() {
             it("should throw error", function() {
                 var expr = jsonata('$match("a, b, c, d", true)');
-                expect(function() {
+                expectError(() => {
                     expr.evaluate();
-                })
-                    .to.throw()
-                    .to.deep.contain({ position: 7, code: "T0410", token: "match", index: 2, value: true });
+                }, { position: 7, code: "T0410", token: "match", index: 2, value: true });
             });
         });
 
         describe("$match(12345, 3)", function() {
             it("should throw error", function() {
                 var expr = jsonata("$match(12345, 3)");
-                expect(function() {
+                expectError(() => {
                     expr.evaluate();
-                })
-                    .to.throw()
-                    .to.deep.contain({ position: 7, code: "T0410", token: "match", index: 1, value: 12345 });
+                }, { position: 7, code: "T0410", token: "match", index: 1, value: 12345 });
             });
         });
 
         describe("$match(12345)", function() {
             it("should throw error", function() {
                 var expr = jsonata("$match(12345)");
-                expect(function() {
+                expectError(() => {
                     expr.evaluate();
-                })
-                    .to.throw()
-                    .to.deep.contain({ position: 7, code: "T0410", token: "match", index: 1 });
+                }, { position: 7, code: "T0410", token: "match", index: 1 });
             });
         });
     });
@@ -529,7 +510,7 @@ describe("Test that yield platform specific results", () => {
             var expr = jsonata("$sqrt(10) * $sqrt(10)");
             var result = expr.evaluate();
             var expected = 10;
-            expect(result).to.be.closeTo(expected, 1e-13);
+            expect(result).toBeCloseTo(expected);
         });
     });
 });
@@ -537,69 +518,36 @@ describe("Test that yield platform specific results", () => {
 describe("Tests that include infinite recursion", () => {
     describe("stack overflow - infinite recursive function - non-tail call", function() {
         it("should throw error", function() {
-            expect(function() {
+            expectError(() => {
                 var expr = jsonata("(" + "  $inf := function($n){$n+$inf($n-1)};" + "  $inf(5)" + ")");
                 timeboxExpression(expr, 1000, 300);
                 expr.evaluate();
-            })
-                .to.throw()
-                .to.deep.contain({ position: 46, code: "U1001" });
+            }, { position: 46, code: "U1001" });
         });
     });
 
     describe("stack overflow - infinite recursive function - tail call", function() {
-        this.timeout(5000);
+        jest.setTimeout(5000);
         it("should throw error", function() {
-            expect(function() {
+            expectError(() => {
                 var expr = jsonata("(" + "  $inf := function(){$inf()};" + "  $inf()" + ")");
                 timeboxExpression(expr, 1000, 500);
                 expr.evaluate();
-            })
-                .to.throw()
-                .to.deep.contain({ position: 37, code: "U1001" });
+            }, { position: 37, code: "U1001" });
         });
     });
 });
 
-/**
- * Protect the process/browser from a runnaway expression
- * i.e. Infinite loop (tail recursion), or excessive stack growth
- *
- * @param {Object} expr - expression to protect
- * @param {Number} timeout - max time in ms
- * @param {Number} maxDepth - max stack depth
- */
-function timeboxExpression(expr, timeout, maxDepth) {
-    var depth = 0;
-    var time = Date.now();
-
-    var checkRunnaway = function() {
-        if (depth > maxDepth) {
-            // stack too deep
-            throw {
-                message:
-                    "Stack overflow error: Check for non-terminating recursive function.  Consider rewriting as tail-recursive.",
-                stack: new Error().stack,
-                code: "U1001"
-            };
-        }
-        if (Date.now() - time > timeout) {
-            // expression has run for too long
-            throw {
-                message: "Expression evaluation timeout: Check for infinite loop",
-                stack: new Error().stack,
-                code: "U1001"
-            };
-        }
-    };
 
-    // register callbacks
-    expr.assign("__evaluate_entry", function() {
-        depth++;
-        checkRunnaway();
-    });
-    expr.assign("__evaluate_exit", function() {
-        depth--;
-        checkRunnaway();
-    });
+function expectError(f: () => any, fields) {
+    let error = false;
+    try {
+        f();
+    } catch(e) {
+        Object.keys(fields).forEach((key) => {
+            expect(e[key]).toEqual(fields[key]);
+        });
+        error = true;
+    }
+    expect(error).toBeTruthy();                        
 }
diff --git a/__tests__/parser-recovery.ts b/__tests__/parser-recovery.ts
new file mode 100644
index 00000000..da662c89
--- /dev/null
+++ b/__tests__/parser-recovery.ts
@@ -0,0 +1,502 @@
+"use strict";
+
+var jsonata = require("../src").jsonata;
+var assert = require("assert");
+
+describe("Invoke parser with valid expression", function() {
+    describe("Account.Order[0]", function() {
+        it("should return ast", function() {
+            var expr = jsonata("Account.Order[0]", { recover: true });
+            var ast = expr.ast();
+            var expected_ast = {
+                type: "path",
+                keepSingletonArray: false,
+                position: 8,
+                value: ".",
+                steps: [
+                    {
+                        value: "Account",
+                        type: "name",
+                        position: 7,
+                    },
+                    {
+                        value: "Order",
+                        type: "name",
+                        position: 13,
+                        predicate: [
+                            {
+                                value: 0,
+                                type: "literal",
+                                position: 15,
+                            },
+                        ],
+                    },
+                ],
+            };
+            var errors = expr.errors();
+            var expected_errors = [];
+            assert.deepEqual(ast, expected_ast);
+            assert.deepEqual(errors, expected_errors);
+        });
+    });
+});
+
+describe("Invoke parser with incomplete expression", function() {
+    describe("Account.", function() {
+        it("should return ast", function() {
+            var expr = jsonata("Account.", { recover: true });
+            var ast = expr.ast();
+            var expected_ast = {
+                type: "path",
+                keepSingletonArray: false,
+                position: 8,
+                value: ".",
+                steps: [
+                    {
+                        value: "Account",
+                        type: "name",
+                        position: 7,
+                    },
+                    {
+                        type: "error",
+                        error: {
+                            code: "S0207",
+                            position: 8,
+                            token: "(end)",
+                        },
+                        lhs: {
+                            position: 8,
+                            type: "end",
+                            value: "(end)",
+                        },
+                        position: 8,
+                        remaining: [],
+                        value: "(end)",
+                    },
+                ],
+            };
+            var errors = expr.errors();
+            var expected_errors = [
+                {
+                    code: "S0207",
+                    position: 8,
+                    token: "(end)",
+                },
+            ];
+            assert.deepEqual(ast, expected_ast);
+            assert.deepEqual(errors, expected_errors);
+        });
+    });
+
+    describe("Account[", function() {
+        it("should return ast", function() {
+            var expr = jsonata("Account[", { recover: true });
+            var ast = expr.ast();
+            var expected_ast = {
+                type: "path",
+                keepSingletonArray: false,
+                position: 7,
+                value: "Account",
+                steps: [
+                    {
+                        value: "Account",
+                        type: "name",
+                        position: 7,
+                        predicate: [
+                            {
+                                type: "error",
+                                error: {
+                                    code: "S0207",
+                                    position: 8,
+                                    token: "(end)",
+                                },
+                                lhs: {
+                                    position: 8,
+                                    type: "end",
+                                    value: "(end)",
+                                },
+                                position: 8,
+                                remaining: [],
+                                value: "(end)",
+                            },
+                        ],
+                    },
+                ],
+            };
+            var errors = expr.errors();
+            var expected_errors = [
+                {
+                    code: "S0203",
+                    position: 8,
+                    token: "(end)",
+                    value: "]",
+                    remaining: [],
+                },
+                {
+                    code: "S0207",
+                    position: 8,
+                    token: "(end)",
+                },
+            ];
+            assert.deepEqual(ast, expected_ast);
+            assert.deepEqual(errors, expected_errors);
+        });
+    });
+
+    describe("Account.Order[;0].Product", function() {
+        it("should return ast", function() {
+            var expr = jsonata("Account.Order[;0].Product", { recover: true });
+            var ast = expr.ast();
+            var expected_ast = {
+                type: "path",
+                keepSingletonArray: false,
+                position: 8,
+                value: ".",
+                steps: [
+                    {
+                        value: "Account",
+                        type: "name",
+                        position: 7,
+                    },
+                    {
+                        value: "Order",
+                        type: "name",
+                        position: 13,
+                        predicate: [
+                            {
+                                code: "S0211",
+                                token: ";",
+                                position: 15,
+                                remaining: [
+                                    { value: 0, type: "literal", position: 16 },
+                                    { type: "operator", value: "]", position: 17 },
+                                    { type: "operator", value: ".", position: 18 },
+                                    { type: "name", value: "Product", position: 25 },
+                                ],
+                                type: "error",
+                            },
+                        ],
+                    },
+                ],
+            };
+            var errors = expr.errors();
+            var expected_errors = [
+                {
+                    code: "S0211",
+                    token: ";",
+                    position: 15,
+                    remaining: [
+                        { value: 0, type: "literal", position: 16 },
+                        { type: "operator", value: "]", position: 17 },
+                        { type: "operator", value: ".", position: 18 },
+                        { type: "name", value: "Product", position: 25 },
+                    ],
+                    type: "error",
+                },
+                {
+                    code: "S0202",
+                    position: 16,
+                    token: "0",
+                    value: "]",
+                    remaining: [
+                        {
+                            value: 0,
+                            type: "literal",
+                            position: 16,
+                        },
+                    ],
+                },
+            ];
+            assert.deepEqual(ast, expected_ast);
+            assert.deepEqual(errors, expected_errors);
+        });
+    });
+
+    describe("Account.Order[0;].Product", function() {
+        it("should return ast", function() {
+            var expr = jsonata("Account.Order[0;].Product", { recover: true });
+            var ast = expr.ast();
+            var expected_ast = {
+                type: "path",
+                keepSingletonArray: false,
+                position: 8,
+                value: ".",
+                steps: [
+                    {
+                        value: "Account",
+                        type: "name",
+                        position: 7,
+                    },
+                    {
+                        value: "Order",
+                        type: "name",
+                        position: 13,
+                        predicate: [
+                            {
+                                value: 0,
+                                type: "literal",
+                                position: 15,
+                            },
+                        ],
+                    },
+                ],
+            };
+            var errors = expr.errors();
+            var expected_errors = [
+                {
+                    code: "S0202",
+                    position: 16,
+                    token: ";",
+                    value: "]",
+                    remaining: [
+                        { value: ";", type: "operator", position: 16 },
+                        { type: "operator", value: "]", position: 17 },
+                        { type: "operator", value: ".", position: 18 },
+                        { type: "name", value: "Product", position: 25 },
+                    ],
+                },
+            ];
+            assert.deepEqual(ast, expected_ast);
+            assert.deepEqual(errors, expected_errors);
+        });
+    });
+
+    describe("Account.Order[0].Product;", function() {
+        it("should return ast", function() {
+            var expr = jsonata("Account.Order[0].Product;", { recover: true });
+            var ast = expr.ast();
+            var expected_ast = {
+                type: "path",
+                keepSingletonArray: false,
+                position: 17,
+                value: ".",
+                steps: [
+                    {
+                        value: "Account",
+                        type: "name",
+                        position: 7,
+                    },
+                    {
+                        value: "Order",
+                        type: "name",
+                        position: 13,
+                        predicate: [
+                            {
+                                value: 0,
+                                type: "literal",
+                                position: 15,
+                            },
+                        ],
+                    },
+                    {
+                        value: "Product",
+                        type: "name",
+                        position: 24,
+                    },
+                ],
+            };
+            var errors = expr.errors();
+            var expected_errors = [
+                {
+                    code: "S0201",
+                    position: 25,
+                    remaining: [
+                        {
+                            position: 25,
+                            type: "operator",
+                            value: ";",
+                        },
+                    ],
+                    token: ";",
+                },
+            ];
+            assert.deepEqual(ast, expected_ast);
+            assert.deepEqual(errors, expected_errors);
+        });
+    });
+
+    describe("$equals3lucy[0].UnstructuredAnswers^()[0].Text", function() {
+        it("should return ast", function() {
+            var expr = jsonata("$equals3lucy[0].UnstructuredAnswers^()[0].Text", { recover: true });
+            var ast = expr.ast();
+            var expected_ast = {
+                type: "sort",
+                value: "^",
+                position: 36,
+                lhs: {
+                    type: "path",
+                    keepSingletonArray: false,
+                    position: 16,
+                    value: ".",
+                    steps: [
+                        {
+                            value: "equals3lucy",
+                            type: "variable",
+                            position: 12,
+                            predicate: [
+                                {
+                                    value: 0,
+                                    type: "literal",
+                                    position: 14,
+                                },
+                            ],
+                        },
+                        {
+                            value: "UnstructuredAnswers",
+                            type: "name",
+                            position: 35,
+                        },
+                    ],
+                },
+                rhs: [
+                    {
+                        descending: false,
+                        expression: {
+                            code: "S0211",
+                            token: ")",
+                            position: 38,
+                            remaining: [
+                                {
+                                    type: "operator",
+                                    value: "[",
+                                    position: 39,
+                                },
+                                {
+                                    type: "number",
+                                    value: 0,
+                                    position: 40,
+                                },
+                                {
+                                    type: "operator",
+                                    value: "]",
+                                    position: 41,
+                                },
+                                {
+                                    type: "operator",
+                                    value: ".",
+                                    position: 42,
+                                },
+                                {
+                                    type: "name",
+                                    value: "Text",
+                                    position: 46,
+                                },
+                            ],
+                            type: "error",
+                            predicate: [
+                                {
+                                    type: "error",
+                                    error: {
+                                        code: "S0207",
+                                        position: 46,
+                                        token: "(end)",
+                                    },
+                                    lhs: {
+                                        position: 46,
+                                        type: "end",
+                                        value: "(end)",
+                                    },
+                                    position: 46,
+                                    remaining: [],
+                                    value: "(end)",
+                                },
+                            ],
+                        },
+                    },
+                ],
+            };
+            var errors = expr.errors();
+            var expected_errors = [
+                {
+                    code: "S0211",
+                    position: 38,
+                    predicate: [
+                        {
+                            error: {
+                                code: "S0207",
+                                position: 46,
+                                token: "(end)",
+                            },
+                            type: "error",
+                            lhs: {
+                                position: 46,
+                                type: "end",
+                                value: "(end)",
+                            },
+                            position: 46,
+                            remaining: [],
+                            value: "(end)",
+                        },
+                    ],
+                    remaining: [
+                        {
+                            position: 39,
+                            type: "operator",
+                            value: "[",
+                        },
+                        {
+                            position: 40,
+                            type: "number",
+                            value: 0,
+                        },
+                        {
+                            position: 41,
+                            type: "operator",
+                            value: "]",
+                        },
+                        {
+                            position: 42,
+                            type: "operator",
+                            value: ".",
+                        },
+                        {
+                            position: 46,
+                            type: "name",
+                            value: "Text",
+                        },
+                    ],
+                    token: ")",
+                    type: "error",
+                },
+                {
+                    code: "S0203",
+                    position: 46,
+                    remaining: [],
+                    token: "(end)",
+                    value: "]",
+                },
+                {
+                    code: "S0203",
+                    position: 46,
+                    remaining: [],
+                    token: "(end)",
+                    value: ")",
+                },
+                {
+                    code: "S0207",
+                    position: 46,
+                    token: "(end)",
+                },
+            ];
+            assert.deepEqual(ast, expected_ast);
+            assert.deepEqual(errors, expected_errors);
+        });
+    });
+
+    describe("An expression with syntax error should not be executable", function() {
+        describe("Account.", function() {
+            it("should return ast", function() {
+                var expr = jsonata("Account.", { recover: true });
+                let error = false;
+                try {
+                    expr.evaluate({});
+                } catch (e) {
+                    expect(e.position).toEqual(0);
+                    expect(e.code).toEqual("S0500");
+                    error = true;
+                }
+                expect(error).toBeTruthy();
+            });
+        });
+    });
+});
diff --git a/test/run-test-suite.js b/__tests__/run-test-suite.ts
similarity index 76%
rename from test/run-test-suite.js
rename to __tests__/run-test-suite.ts
index ddf6ff52..d17e82f1 100644
--- a/test/run-test-suite.js
+++ b/__tests__/run-test-suite.ts
@@ -8,9 +8,8 @@
 
 var fs = require("fs");
 var path = require("path");
-var jsonata = require("../jsonata");
-var chai = require("chai");
-var expect = chai.expect;
+var jsonata = require('../src').jsonata;
+import { timeboxExpression } from '../src/utils';
 
 let groups = fs.readdirSync(path.join(__dirname, "test-suite", "groups")).filter((name) => !name.endsWith(".json"));
 
@@ -58,7 +57,7 @@ describe("JSONata Test Suite", () => {
                         // If there is a timelimit and depth limit for this case, use the
                         // `timeboxExpression` function to limit evaluation
                         if ("timelimit" in testcase && "depth" in testcase) {
-                            this.timeout(testcase.timelimit * 2);
+                            jest.setTimeout(testcase.timelimit*2);
                             timeboxExpression(expr, testcase.timelimit, testcase.depth);
                         }
                     } catch (e) {
@@ -67,10 +66,10 @@ describe("JSONata Test Suite", () => {
                         // `code` field in the testcase)
                         if (testcase.code) {
                             // See if we go the code we expected
-                            expect(e.code).to.equal(testcase.code);
+                            expect(e.code).toEqual(testcase.code);
                             // If a token was specified, check for that too
                             if (testcase.hasOwnProperty("token")) {
-                                expect(e.token).to.equal(testcase.token);
+                                expect(e.code).toEqual(testcase.token);
                             }
                         } else {
                             // If we get here, something went wrong because an exception
@@ -91,21 +90,26 @@ describe("JSONata Test Suite", () => {
                             // First is that we have an undefined result.  So, check
                             // to see if the result we get from evaluation is undefined
                             let result = expr.evaluate(dataset, testcase.bindings);
-                            expect(result).to.deep.equal(undefined);
+                            expect(result).toBeUndefined();
                         } else if ("result" in testcase) {
                             // Second is that a (defined) result was provided.  In this case,
                             // we do a deep equality check against the expected result.
                             let result = expr.evaluate(dataset, testcase.bindings);
-                            expect(result).to.deep.equal(testcase.result);
+                            expect(result).toEqual(testcase.result);
                         } else if ("code" in testcase) {
                             // Finally, if a `code` field was specified, we expected the
                             // evaluation to fail and include the specified code in the
                             // thrown exception.
-                            expect(function() {
-                                expr.evaluate(dataset, testcase.bindings);
-                            })
-                                .to.throw()
-                                .to.deep.contain({ code: testcase.code });
+                            let error = false;
+                            try {
+                                expr.evaluate(dataset, testcase.bindings);                                
+                            } catch(e) {
+                                expect(e.code).toEqual(testcase.code);
+                                error = true;
+                            }
+                            // If this is thrown, it is because we expected an error to be
+                            // thrown but it wasn't.
+                            expect(error).toBeTruthy();
                         } else {
                             // If we get here, it means there is something wrong with
                             // the test case data because there was nothing to check.
@@ -118,49 +122,6 @@ describe("JSONata Test Suite", () => {
     });
 });
 
-/**
- * Protect the process/browser from a runnaway expression
- * i.e. Infinite loop (tail recursion), or excessive stack growth
- *
- * @param {Object} expr - expression to protect
- * @param {Number} timeout - max time in ms
- * @param {Number} maxDepth - max stack depth
- */
-function timeboxExpression(expr, timeout, maxDepth) {
-    var depth = 0;
-    var time = Date.now();
-
-    var checkRunnaway = function() {
-        if (depth > maxDepth) {
-            // stack too deep
-            throw {
-                message:
-                    "Stack overflow error: Check for non-terminating recursive function.  Consider rewriting as tail-recursive.",
-                stack: new Error().stack,
-                code: "U1001"
-            };
-        }
-        if (Date.now() - time > timeout) {
-            // expression has run for too long
-            throw {
-                message: "Expression evaluation timeout: Check for infinite loop",
-                stack: new Error().stack,
-                code: "U1001"
-            };
-        }
-    };
-
-    // register callbacks
-    expr.assign("__evaluate_entry", function() {
-        depth++;
-        checkRunnaway();
-    });
-    expr.assign("__evaluate_exit", function() {
-        depth--;
-        checkRunnaway();
-    });
-}
-
 /**
  * Based on the collection of datasets and the information provided as part of the testcase,
  * determine what input data to use in the case (may return undefined).
@@ -180,4 +141,10 @@ function resolveDataset(datasets, testcase) {
         return datasets[testcase.dataset];
     }
     throw new Error("Unable to find dataset "+testcase.dataset+" among known datasets, are you sure the datasets directory has a file named "+testcase.dataset+".json?");
-}
\ No newline at end of file
+}
+
+describe("This is a jest test", () => {
+    test("An actual test", async () => {
+        return 5;
+    })
+})
\ No newline at end of file
diff --git a/test/test-suite/TESTSUITE.md b/__tests__/test-suite/TESTSUITE.md
similarity index 100%
rename from test/test-suite/TESTSUITE.md
rename to __tests__/test-suite/TESTSUITE.md
diff --git a/test/test-suite/datasets/dataset0.json b/__tests__/test-suite/datasets/dataset0.json
similarity index 100%
rename from test/test-suite/datasets/dataset0.json
rename to __tests__/test-suite/datasets/dataset0.json
diff --git a/test/test-suite/datasets/dataset1.json b/__tests__/test-suite/datasets/dataset1.json
similarity index 100%
rename from test/test-suite/datasets/dataset1.json
rename to __tests__/test-suite/datasets/dataset1.json
diff --git a/test/test-suite/datasets/dataset10.json b/__tests__/test-suite/datasets/dataset10.json
similarity index 100%
rename from test/test-suite/datasets/dataset10.json
rename to __tests__/test-suite/datasets/dataset10.json
diff --git a/test/test-suite/datasets/dataset11.json b/__tests__/test-suite/datasets/dataset11.json
similarity index 100%
rename from test/test-suite/datasets/dataset11.json
rename to __tests__/test-suite/datasets/dataset11.json
diff --git a/test/test-suite/datasets/dataset12.json b/__tests__/test-suite/datasets/dataset12.json
similarity index 100%
rename from test/test-suite/datasets/dataset12.json
rename to __tests__/test-suite/datasets/dataset12.json
diff --git a/test/test-suite/datasets/dataset13.json b/__tests__/test-suite/datasets/dataset13.json
similarity index 100%
rename from test/test-suite/datasets/dataset13.json
rename to __tests__/test-suite/datasets/dataset13.json
diff --git a/test/test-suite/datasets/dataset14.json b/__tests__/test-suite/datasets/dataset14.json
similarity index 100%
rename from test/test-suite/datasets/dataset14.json
rename to __tests__/test-suite/datasets/dataset14.json
diff --git a/test/test-suite/datasets/dataset15.json b/__tests__/test-suite/datasets/dataset15.json
similarity index 100%
rename from test/test-suite/datasets/dataset15.json
rename to __tests__/test-suite/datasets/dataset15.json
diff --git a/test/test-suite/datasets/dataset16.json b/__tests__/test-suite/datasets/dataset16.json
similarity index 100%
rename from test/test-suite/datasets/dataset16.json
rename to __tests__/test-suite/datasets/dataset16.json
diff --git a/test/test-suite/datasets/dataset17.json b/__tests__/test-suite/datasets/dataset17.json
similarity index 100%
rename from test/test-suite/datasets/dataset17.json
rename to __tests__/test-suite/datasets/dataset17.json
diff --git a/test/test-suite/datasets/dataset18.json b/__tests__/test-suite/datasets/dataset18.json
similarity index 100%
rename from test/test-suite/datasets/dataset18.json
rename to __tests__/test-suite/datasets/dataset18.json
diff --git a/test/test-suite/datasets/dataset19.json b/__tests__/test-suite/datasets/dataset19.json
similarity index 100%
rename from test/test-suite/datasets/dataset19.json
rename to __tests__/test-suite/datasets/dataset19.json
diff --git a/test/test-suite/datasets/dataset2.json b/__tests__/test-suite/datasets/dataset2.json
similarity index 100%
rename from test/test-suite/datasets/dataset2.json
rename to __tests__/test-suite/datasets/dataset2.json
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rename from test/test-suite/groups/string-concat/case011.json
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diff --git a/test/test-suite/groups/tail-recursion/case000.json b/__tests__/test-suite/groups/tail-recursion/case000.json
similarity index 100%
rename from test/test-suite/groups/tail-recursion/case000.json
rename to __tests__/test-suite/groups/tail-recursion/case000.json
diff --git a/test/test-suite/groups/tail-recursion/case001.json b/__tests__/test-suite/groups/tail-recursion/case001.json
similarity index 90%
rename from test/test-suite/groups/tail-recursion/case001.json
rename to __tests__/test-suite/groups/tail-recursion/case001.json
index c9fdf2f9..15ef1d31 100644
--- a/test/test-suite/groups/tail-recursion/case001.json
+++ b/__tests__/test-suite/groups/tail-recursion/case001.json
@@ -1,7 +1,7 @@
 {
     "expr": "(  $factorial := function($n){$n = 0 ? 1 : $n * $factorial($n - 1)};  $factorial(99))             ",
     "dataset": null,
-    "timelimit": 1000,
+    "timelimit": 2000,
     "depth": 302,
     "bindings": {},
     "result": 9.33262154439441e+155
diff --git a/test/test-suite/groups/tail-recursion/case002.json b/__tests__/test-suite/groups/tail-recursion/case002.json
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diff --git a/test/test-suite/groups/tail-recursion/case004.json b/__tests__/test-suite/groups/tail-recursion/case004.json
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rename from test/test-suite/groups/tail-recursion/case007.json
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diff --git a/jsonata.d.ts b/jsonata.d.ts
deleted file mode 100644
index cb55c8e7..00000000
--- a/jsonata.d.ts
+++ /dev/null
@@ -1,20 +0,0 @@
-// Type definitions for jsonata 1.4
-// Project: https://github.com/jsonata-js/jsonata
-// Definitions by: Nick <https://github.com/nick121212> and Michael M. Tiller <https://github.com/xogeny>
-
-declare function jsonata(str: string): jsonata.Expression;
-declare namespace jsonata {
-  interface ExprNode {
-      type: string;
-      value: any;
-      position: number;
-  }
-  interface Expression {
-    evaluate(input: any, bindings?: { [name: string]: any }, callback?: (err: Error, resp: any) => void): any;
-    assign(name: string, value: any): void;
-    registerFunction(name: string, f: Function, signature?: string): void;
-    ast(): ExprNode;
-  }
-}
-
-export = jsonata;
\ No newline at end of file
diff --git a/jsonata.js b/jsonata.js
deleted file mode 100644
index 291e758a..00000000
--- a/jsonata.js
+++ /dev/null
@@ -1,5008 +0,0 @@
-/**
- * © Copyright IBM Corp. 2016, 2017 All Rights Reserved
- *   Project name: JSONata
- *   This project is licensed under the MIT License, see LICENSE
- */
-
-/**
- * @module JSONata
- * @description JSON query and transformation language
- */
-
-/**
- * jsonata
- * @function
- * @param {Object} expr - JSONata expression
- * @returns {{evaluate: evaluate, assign: assign}} Evaluated expression
- */
-var jsonata = (function() {
-    'use strict';
-
-    var operators = {
-        '.': 75,
-        '[': 80,
-        ']': 0,
-        '{': 70,
-        '}': 0,
-        '(': 80,
-        ')': 0,
-        ',': 0,
-        '@': 75,
-        '#': 70,
-        ';': 80,
-        ':': 80,
-        '?': 20,
-        '+': 50,
-        '-': 50,
-        '*': 60,
-        '/': 60,
-        '%': 60,
-        '|': 20,
-        '=': 40,
-        '<': 40,
-        '>': 40,
-        '^': 40,
-        '**': 60,
-        '..': 20,
-        ':=': 10,
-        '!=': 40,
-        '<=': 40,
-        '>=': 40,
-        '~>': 40,
-        'and': 30,
-        'or': 25,
-        'in': 40,
-        '&': 50,
-        '!': 0,   // not an operator, but needed as a stop character for name tokens
-        '~': 0   // not an operator, but needed as a stop character for name tokens
-    };
-
-    var escapes = {  // JSON string escape sequences - see json.org
-        '"': '"',
-        '\\': '\\',
-        '/': '/',
-        'b': '\b',
-        'f': '\f',
-        'n': '\n',
-        'r': '\r',
-        't': '\t'
-    };
-
-    // Tokenizer (lexer) - invoked by the parser to return one token at a time
-    var tokenizer = function (path) {
-        var position = 0;
-        var length = path.length;
-
-        var create = function (type, value) {
-            var obj = {type: type, value: value, position: position};
-            return obj;
-        };
-
-        var scanRegex = function() {
-            // the prefix '/' will have been previously scanned. Find the end of the regex.
-            // search for closing '/' ignoring any that are escaped, or within brackets
-            var start = position;
-            var depth = 0;
-            var pattern;
-            var flags;
-            while(position < length) {
-                var currentChar = path.charAt(position);
-                if(currentChar === '/' && path.charAt(position - 1) !== '\\' && depth === 0) {
-                    // end of regex found
-                    pattern = path.substring(start, position);
-                    if(pattern === '') {
-                        throw {
-                            code: "S0301",
-                            stack: (new Error()).stack,
-                            position: position
-                        };
-                    }
-                    position++;
-                    currentChar = path.charAt(position);
-                    // flags
-                    start = position;
-                    while(currentChar === 'i' || currentChar === 'm') {
-                        position++;
-                        currentChar = path.charAt(position);
-                    }
-                    flags = path.substring(start, position) + 'g';
-                    return new RegExp(pattern, flags);
-                }
-                if((currentChar === '(' || currentChar === '[' || currentChar === '{') && path.charAt(position - 1) !== '\\' ) {
-                    depth++;
-                }
-                if((currentChar === ')' || currentChar === ']' || currentChar === '}') && path.charAt(position - 1) !== '\\' ) {
-                    depth--;
-                }
-
-                position++;
-            }
-            throw {
-                code: "S0302",
-                stack: (new Error()).stack,
-                position: position
-            };
-        };
-
-        var next = function (prefix) {
-            if (position >= length) return null;
-            var currentChar = path.charAt(position);
-            // skip whitespace
-            while (position < length && ' \t\n\r\v'.indexOf(currentChar) > -1) {
-                position++;
-                currentChar = path.charAt(position);
-            }
-            // test for regex
-            if (prefix !== true && currentChar === '/') {
-                position++;
-                return create('regex', scanRegex());
-            }
-            // handle double-char operators
-            if (currentChar === '.' && path.charAt(position + 1) === '.') {
-                // double-dot .. range operator
-                position += 2;
-                return create('operator', '..');
-            }
-            if (currentChar === ':' && path.charAt(position + 1) === '=') {
-                // := assignment
-                position += 2;
-                return create('operator', ':=');
-            }
-            if (currentChar === '!' && path.charAt(position + 1) === '=') {
-                // !=
-                position += 2;
-                return create('operator', '!=');
-            }
-            if (currentChar === '>' && path.charAt(position + 1) === '=') {
-                // >=
-                position += 2;
-                return create('operator', '>=');
-            }
-            if (currentChar === '<' && path.charAt(position + 1) === '=') {
-                // <=
-                position += 2;
-                return create('operator', '<=');
-            }
-            if (currentChar === '*' && path.charAt(position + 1) === '*') {
-                // **  descendant wildcard
-                position += 2;
-                return create('operator', '**');
-            }
-            if (currentChar === '~' && path.charAt(position + 1) === '>') {
-                // ~>  chain function
-                position += 2;
-                return create('operator', '~>');
-            }
-            // test for single char operators
-            if (operators.hasOwnProperty(currentChar)) {
-                position++;
-                return create('operator', currentChar);
-            }
-            // test for string literals
-            if (currentChar === '"' || currentChar === "'") {
-                var quoteType = currentChar;
-                // double quoted string literal - find end of string
-                position++;
-                var qstr = "";
-                while (position < length) {
-                    currentChar = path.charAt(position);
-                    if (currentChar === '\\') { // escape sequence
-                        position++;
-                        currentChar = path.charAt(position);
-                        if (escapes.hasOwnProperty(currentChar)) {
-                            qstr += escapes[currentChar];
-                        } else if (currentChar === 'u') {
-                            // \u should be followed by 4 hex digits
-                            var octets = path.substr(position + 1, 4);
-                            if (/^[0-9a-fA-F]+$/.test(octets)) {
-                                var codepoint = parseInt(octets, 16);
-                                qstr += String.fromCharCode(codepoint);
-                                position += 4;
-                            } else {
-                                throw {
-                                    code: "S0104",
-                                    stack: (new Error()).stack,
-                                    position: position
-                                };
-                            }
-                        } else {
-                            // illegal escape sequence
-                            throw {
-                                code: "S0103",
-                                stack: (new Error()).stack,
-                                position: position,
-                                token: currentChar
-                            };
-
-                        }
-                    } else if (currentChar === quoteType) {
-                        position++;
-                        return create('string', qstr);
-                    } else {
-                        qstr += currentChar;
-                    }
-                    position++;
-                }
-                throw {
-                    code: "S0101",
-                    stack: (new Error()).stack,
-                    position: position
-                };
-            }
-            // test for numbers
-            var numregex = /^-?(0|([1-9][0-9]*))(\.[0-9]+)?([Ee][-+]?[0-9]+)?/;
-            var match = numregex.exec(path.substring(position));
-            if (match !== null) {
-                var num = parseFloat(match[0]);
-                if (!isNaN(num) && isFinite(num)) {
-                    position += match[0].length;
-                    return create('number', num);
-                } else {
-                    throw {
-                        code: "S0102",
-                        stack: (new Error()).stack,
-                        position: position,
-                        token: match[0]
-                    };
-                }
-            }
-            // test for quoted names (backticks)
-            var name;
-            if(currentChar === '`') {
-                // scan for closing quote
-                position++;
-                var end = path.indexOf('`', position);
-                if(end !== -1) {
-                    name = path.substring(position, end);
-                    position = end + 1;
-                    return create('name', name);
-                }
-                position = length;
-                throw {
-                    code: "S0105",
-                    stack: (new Error()).stack,
-                    position: position
-                };
-            }
-            // test for names
-            var i = position;
-            var ch;
-            for (;;) {
-                ch = path.charAt(i);
-                if (i === length || ' \t\n\r\v'.indexOf(ch) > -1 || operators.hasOwnProperty(ch)) {
-                    if (path.charAt(position) === '$') {
-                        // variable reference
-                        name = path.substring(position + 1, i);
-                        position = i;
-                        return create('variable', name);
-                    } else {
-                        name = path.substring(position, i);
-                        position = i;
-                        switch (name) {
-                            case 'or':
-                            case 'in':
-                            case 'and':
-                                return create('operator', name);
-                            case 'true':
-                                return create('value', true);
-                            case 'false':
-                                return create('value', false);
-                            case 'null':
-                                return create('value', null);
-                            default:
-                                if (position === length && name === '') {
-                                    // whitespace at end of input
-                                    return null;
-                                }
-                                return create('name', name);
-                        }
-                    }
-                } else {
-                    i++;
-                }
-            }
-        };
-
-        return next;
-    };
-
-    /**
-     * Parses a function signature definition and returns a validation function
-     * @param {string} signature - the signature between the <angle brackets>
-     * @returns {Function} validation function
-     */
-    function parseSignature(signature) {
-        // create a Regex that represents this signature and return a function that when invoked,
-        // returns the validated (possibly fixed-up) arguments, or throws a validation error
-        // step through the signature, one symbol at a time
-        var position = 1;
-        var params = [];
-        var param = {};
-        var prevParam = param;
-        while (position < signature.length) {
-            var symbol = signature.charAt(position);
-            if(symbol === ':') {
-                // TODO figure out what to do with the return type
-                // ignore it for now
-                break;
-            }
-
-            var next = function() {
-                params.push(param);
-                prevParam = param;
-                param = {};
-            };
-
-            var findClosingBracket = function(str, start, openSymbol, closeSymbol) {
-                // returns the position of the closing symbol (e.g. bracket) in a string
-                // that balances the opening symbol at position start
-                var depth = 1;
-                var position = start;
-                while(position < str.length) {
-                    position++;
-                    symbol = str.charAt(position);
-                    if(symbol === closeSymbol) {
-                        depth--;
-                        if(depth === 0) {
-                            // we're done
-                            break; // out of while loop
-                        }
-                    } else if(symbol === openSymbol) {
-                        depth++;
-                    }
-                }
-                return position;
-            };
-
-            switch (symbol) {
-                case 's': // string
-                case 'n': // number
-                case 'b': // boolean
-                case 'l': // not so sure about expecting null?
-                case 'o': // object
-                    param.regex = '[' + symbol + 'm]';
-                    param.type = symbol;
-                    next();
-                    break;
-                case 'a': // array
-                    //  normally treat any value as singleton array
-                    param.regex = '[asnblfom]';
-                    param.type = symbol;
-                    param.array = true;
-                    next();
-                    break;
-                case 'f': // function
-                    param.regex = 'f';
-                    param.type = symbol;
-                    next();
-                    break;
-                case 'j': // any JSON type
-                    param.regex = '[asnblom]';
-                    param.type = symbol;
-                    next();
-                    break;
-                case 'x': // any type
-                    param.regex = '[asnblfom]';
-                    param.type = symbol;
-                    next();
-                    break;
-                case '-': // use context if param not supplied
-                    prevParam.context = true;
-                    prevParam.contextRegex = new RegExp(prevParam.regex); // pre-compiled to test the context type at runtime
-                    prevParam.regex += '?';
-                    break;
-                case '?': // optional param
-                case '+': // one or more
-                    prevParam.regex += symbol;
-                    break;
-                case '(': // choice of types
-                    // search forward for matching ')'
-                    var endParen = findClosingBracket(signature, position, '(', ')');
-                    var choice = signature.substring(position + 1, endParen);
-                    if(choice.indexOf('<') === -1) {
-                        // no parameterized types, simple regex
-                        param.regex = '[' + choice + 'm]';
-                    } else {
-                        // TODO harder
-                        throw {
-                            code: "S0402",
-                            stack: (new Error()).stack,
-                            value: choice,
-                            offset: position
-                        };
-                    }
-                    param.type = '(' + choice + ')';
-                    position = endParen;
-                    next();
-                    break;
-                case '<': // type parameter - can only be applied to 'a' and 'f'
-                    if(prevParam.type === 'a' || prevParam.type === 'f') {
-                        // search forward for matching '>'
-                        var endPos = findClosingBracket(signature, position, '<', '>');
-                        prevParam.subtype = signature.substring(position + 1, endPos);
-                        position = endPos;
-                    } else {
-                        throw {
-                            code: "S0401",
-                            stack: (new Error()).stack,
-                            value: prevParam.type,
-                            offset: position
-                        };
-                    }
-                    break;
-            }
-            position++;
-        }
-        var regexStr = '^' +
-          params.map(function(param) {
-              return '(' + param.regex + ')';
-          }).join('') +
-          '$';
-        var regex = new RegExp(regexStr);
-        var getSymbol = function(value) {
-            var symbol;
-            if(isFunction(value)) {
-                symbol = 'f';
-            } else {
-                var type = typeof value;
-                switch (type) {
-                    case 'string':
-                        symbol = 's';
-                        break;
-                    case 'number':
-                        symbol = 'n';
-                        break;
-                    case 'boolean':
-                        symbol = 'b';
-                        break;
-                    case 'object':
-                        if (value === null) {
-                            symbol = 'l';
-                        } else if (Array.isArray(value)) {
-                            symbol = 'a';
-                        } else {
-                            symbol = 'o';
-                        }
-                        break;
-                    case 'undefined':
-                    default:
-                        // any value can be undefined, but should be allowed to match
-                        symbol = 'm'; // m for missing
-                }
-            }
-            return symbol;
-        };
-
-        var throwValidationError = function(badArgs, badSig) {
-            // to figure out where this went wrong we need apply each component of the
-            // regex to each argument until we get to the one that fails to match
-            var partialPattern = '^';
-            var goodTo = 0;
-            for(var index = 0; index < params.length; index++) {
-                partialPattern += params[index].regex;
-                var match = badSig.match(partialPattern);
-                if(match === null) {
-                    // failed here
-                    throw {
-                        code: "T0410",
-                        stack: (new Error()).stack,
-                        value: badArgs[goodTo],
-                        index: goodTo + 1
-                    };
-                }
-                goodTo = match[0].length;
-            }
-            // if it got this far, it's probably because of extraneous arguments (we
-            // haven't added the trailing '$' in the regex yet.
-            throw {
-                code: "T0410",
-                stack: (new Error()).stack,
-                value: badArgs[goodTo],
-                index: goodTo + 1
-            };
-        };
-
-        return {
-            definition: signature,
-            validate: function(args, context) {
-                var suppliedSig = '';
-                args.forEach(function(arg) {
-                    suppliedSig += getSymbol(arg);
-                });
-                var isValid = regex.exec(suppliedSig);
-                if(isValid) {
-                    var validatedArgs = [];
-                    var argIndex = 0;
-                    params.forEach(function(param, index) {
-                        var arg = args[argIndex];
-                        var match = isValid[index + 1];
-                        if(match === '') {
-                            if (param.context && param.contextRegex) {
-                                // substitute context value for missing arg
-                                // first check that the context value is the right type
-                                var contextType = getSymbol(context);
-                                // test contextType against the regex for this arg (without the trailing ?)
-                                if(param.contextRegex.test(contextType)) {
-                                    validatedArgs.push(context);
-                                } else {
-                                    // context value not compatible with this argument
-                                    throw {
-                                        code: "T0411",
-                                        stack: (new Error()).stack,
-                                        value: context,
-                                        index: argIndex + 1
-                                    };
-                                }
-                            } else {
-                                validatedArgs.push(arg);
-                                argIndex++;
-                            }
-                        } else {
-                            // may have matched multiple args (if the regex ends with a '+'
-                            // split into single tokens
-                            match.split('').forEach(function(single) {
-                                if (param.type === 'a') {
-                                    if (single === 'm') {
-                                        // missing (undefined)
-                                        arg = undefined;
-                                    } else {
-                                        arg = args[argIndex];
-                                        var arrayOK = true;
-                                        // is there type information on the contents of the array?
-                                        if (typeof param.subtype !== 'undefined') {
-                                            if (single !== 'a' && match !== param.subtype) {
-                                                arrayOK = false;
-                                            } else if (single === 'a') {
-                                                if (arg.length > 0) {
-                                                    var itemType = getSymbol(arg[0]);
-                                                    if (itemType !== param.subtype.charAt(0)) { // TODO recurse further
-                                                        arrayOK = false;
-                                                    } else {
-                                                        // make sure every item in the array is this type
-                                                        var differentItems = arg.filter(function (val) {
-                                                            return (getSymbol(val) !== itemType);
-                                                        });
-                                                        arrayOK = (differentItems.length === 0);
-                                                    }
-                                                }
-                                            }
-                                        }
-                                        if (!arrayOK) {
-                                            throw {
-                                                code: "T0412",
-                                                stack: (new Error()).stack,
-                                                value: arg,
-                                                index: argIndex + 1,
-                                                type: param.subtype // TODO translate symbol to type name
-                                            };
-                                        }
-                                        // the function expects an array. If it's not one, make it so
-                                        if (single !== 'a') {
-                                            arg = [arg];
-                                        }
-                                    }
-                                    validatedArgs.push(arg);
-                                    argIndex++;
-                                } else {
-                                    validatedArgs.push(arg);
-                                    argIndex++;
-                                }
-                            });
-                        }
-                    });
-                    return validatedArgs;
-                }
-                throwValidationError(args, suppliedSig);
-            }
-        };
-    }
-
-    // This parser implements the 'Top down operator precedence' algorithm developed by Vaughan R Pratt; http://dl.acm.org/citation.cfm?id=512931.
-    // and builds on the Javascript framework described by Douglas Crockford at http://javascript.crockford.com/tdop/tdop.html
-    // and in 'Beautiful Code', edited by Andy Oram and Greg Wilson, Copyright 2007 O'Reilly Media, Inc. 798-0-596-51004-6
-
-    var parser = function (source, recover) {
-        var node;
-        var lexer;
-
-        var symbol_table = {};
-        var errors = [];
-
-        var remainingTokens = function() {
-            var remaining = [];
-            if(node.id !== '(end)') {
-                remaining.push({type: node.type, value: node.value, position: node.position});
-            }
-            var nxt = lexer();
-            while(nxt !== null) {
-                remaining.push(nxt);
-                nxt = lexer();
-            }
-            return remaining;
-        };
-
-        var base_symbol = {
-            nud: function () {
-                // error - symbol has been invoked as a unary operator
-                var err = {
-                    code: 'S0211',
-                    token: this.value,
-                    position: this.position
-                };
-
-                if(recover) {
-                    err.remaining = remainingTokens();
-                    err.type = 'error';
-                    errors.push(err);
-                    return err;
-                } else {
-                    err.stack = (new Error()).stack;
-                    throw err;
-                }
-            }
-        };
-
-        var symbol = function (id, bp) {
-            var s = symbol_table[id];
-            bp = bp || 0;
-            if (s) {
-                if (bp >= s.lbp) {
-                    s.lbp = bp;
-                }
-            } else {
-                s = Object.create(base_symbol);
-                s.id = s.value = id;
-                s.lbp = bp;
-                symbol_table[id] = s;
-            }
-            return s;
-        };
-
-        var handleError = function(err) {
-            if(recover) {
-                // tokenize the rest of the buffer and add it to an error token
-                err.remaining = remainingTokens();
-                errors.push(err);
-                var symbol = symbol_table["(error)"];
-                node = Object.create(symbol);
-                node.error = err;
-                node.type = "(error)";
-                return node;
-            } else {
-                err.stack = (new Error()).stack;
-                throw err;
-            }
-        };
-
-        var advance = function (id, infix) {
-            if (id && node.id !== id) {
-                var code;
-                if(node.id === '(end)') {
-                    // unexpected end of buffer
-                    code = "S0203";
-                } else {
-                    code = "S0202";
-                }
-                var err = {
-                    code: code,
-                    position: node.position,
-                    token: node.value,
-                    value: id
-                };
-                return handleError(err);
-            }
-            var next_token = lexer(infix);
-            if (next_token === null) {
-                node = symbol_table["(end)"];
-                node.position = source.length;
-                return node;
-            }
-            var value = next_token.value;
-            var type = next_token.type;
-            var symbol;
-            switch (type) {
-                case 'name':
-                case 'variable':
-                    symbol = symbol_table["(name)"];
-                    break;
-                case 'operator':
-                    symbol = symbol_table[value];
-                    if (!symbol) {
-                        return handleError( {
-                            code: "S0204",
-                            stack: (new Error()).stack,
-                            position: next_token.position,
-                            token: value
-                        });
-                    }
-                    break;
-                case 'string':
-                case 'number':
-                case 'value':
-                    type = "literal";
-                    symbol = symbol_table["(literal)"];
-                    break;
-                case 'regex':
-                    type = "regex";
-                    symbol = symbol_table["(regex)"];
-                    break;
-                    /* istanbul ignore next */
-                default:
-                    return handleError( {
-                        code: "S0205",
-                        stack: (new Error()).stack,
-                        position: next_token.position,
-                        token: value
-                    });
-            }
-
-            node = Object.create(symbol);
-            node.value = value;
-            node.type = type;
-            node.position = next_token.position;
-            return node;
-        };
-
-        // Pratt's algorithm
-        var expression = function (rbp) {
-            var left;
-            var t = node;
-            advance(null, true);
-            left = t.nud();
-            while (rbp < node.lbp) {
-                t = node;
-                advance();
-                left = t.led(left);
-            }
-            return left;
-        };
-
-        var terminal = function(id) {
-            var s = symbol(id, 0);
-            s.nud = function() {
-                return this;
-            };
-        };
-
-        // match infix operators
-        // <expression> <operator> <expression>
-        // left associative
-        var infix = function (id, bp, led) {
-            var bindingPower = bp || operators[id];
-            var s = symbol(id, bindingPower);
-            s.led = led || function (left) {
-                this.lhs = left;
-                this.rhs = expression(bindingPower);
-                this.type = "binary";
-                return this;
-            };
-            return s;
-        };
-
-        // match infix operators
-        // <expression> <operator> <expression>
-        // right associative
-        var infixr = function (id, bp, led) {
-            var bindingPower = bp || operators[id];
-            var s = symbol(id, bindingPower);
-            s.led = led || function (left) {
-                this.lhs = left;
-                this.rhs = expression(bindingPower - 1); // subtract 1 from bindingPower for right associative operators
-                this.type = "binary";
-                return this;
-            };
-            return s;
-        };
-
-        // match prefix operators
-        // <operator> <expression>
-        var prefix = function (id, nud) {
-            var s = symbol(id);
-            s.nud = nud || function () {
-                this.expression = expression(70);
-                this.type = "unary";
-                return this;
-            };
-            return s;
-        };
-
-        terminal("(end)");
-        terminal("(name)");
-        terminal("(literal)");
-        terminal("(regex)");
-        symbol(":");
-        symbol(";");
-        symbol(",");
-        symbol(")");
-        symbol("]");
-        symbol("}");
-        symbol(".."); // range operator
-        infix("."); // field reference
-        infix("+"); // numeric addition
-        infix("-"); // numeric subtraction
-        infix("*"); // numeric multiplication
-        infix("/"); // numeric division
-        infix("%"); // numeric modulus
-        infix("="); // equality
-        infix("<"); // less than
-        infix(">"); // greater than
-        infix("!="); // not equal to
-        infix("<="); // less than or equal
-        infix(">="); // greater than or equal
-        infix("&"); // string concatenation
-        infix("and"); // Boolean AND
-        infix("or"); // Boolean OR
-        infix("in"); // is member of array
-        terminal("and"); // the 'keywords' can also be used as terminals (field names)
-        terminal("or"); //
-        terminal("in"); //
-        infixr(":="); // bind variable
-        prefix("-"); // unary numeric negation
-        infix("~>"); // function application
-
-        infixr("(error)", 10, function(left) {
-            this.lhs = left;
-
-            this.error = node.error;
-            this.remaining = remainingTokens();
-            this.type = 'error';
-            return this;
-        });
-
-        // field wildcard (single level)
-        prefix('*', function () {
-            this.type = "wildcard";
-            return this;
-        });
-
-        // descendant wildcard (multi-level)
-        prefix('**', function () {
-            this.type = "descendant";
-            return this;
-        });
-
-        // function invocation
-        infix("(", operators['('], function (left) {
-            // left is is what we are trying to invoke
-            this.procedure = left;
-            this.type = 'function';
-            this.arguments = [];
-            if (node.id !== ')') {
-                for (;;) {
-                    if (node.type === 'operator' && node.id === '?') {
-                        // partial function application
-                        this.type = 'partial';
-                        this.arguments.push(node);
-                        advance('?');
-                    } else {
-                        this.arguments.push(expression(0));
-                    }
-                    if (node.id !== ',') break;
-                    advance(',');
-                }
-            }
-            advance(")", true);
-            // if the name of the function is 'function' or λ, then this is function definition (lambda function)
-            if (left.type === 'name' && (left.value === 'function' || left.value === '\u03BB')) {
-                // all of the args must be VARIABLE tokens
-                this.arguments.forEach(function (arg, index) {
-                    if (arg.type !== 'variable') {
-                        return handleError( {
-                            code: "S0208",
-                            stack: (new Error()).stack,
-                            position: arg.position,
-                            token: arg.value,
-                            value: index + 1
-                        });
-                    }
-                });
-                this.type = 'lambda';
-                // is the next token a '<' - if so, parse the function signature
-                if(node.id === '<') {
-                    var sigPos = node.position;
-                    var depth = 1;
-                    var sig = '<';
-                    while(depth > 0 && node.id !== '{' && node.id !== '(end)') {
-                        var tok = advance();
-                        if(tok.id === '>') {
-                            depth--;
-                        } else if(tok.id === '<') {
-                            depth++;
-                        }
-                        sig += tok.value;
-                    }
-                    advance('>');
-                    try {
-                        this.signature = parseSignature(sig);
-                    } catch(err) {
-                        // insert the position into this error
-                        err.position = sigPos + err.offset;
-                        return handleError( err );
-                    }
-                }
-                // parse the function body
-                advance('{');
-                this.body = expression(0);
-                advance('}');
-            }
-            return this;
-        });
-
-        // parenthesis - block expression
-        prefix("(", function () {
-            var expressions = [];
-            while (node.id !== ")") {
-                expressions.push(expression(0));
-                if (node.id !== ";") {
-                    break;
-                }
-                advance(";");
-            }
-            advance(")", true);
-            this.type = 'block';
-            this.expressions = expressions;
-            return this;
-        });
-
-        // array constructor
-        prefix("[", function () {
-            var a = [];
-            if (node.id !== "]") {
-                for (;;) {
-                    var item = expression(0);
-                    if (node.id === "..") {
-                        // range operator
-                        var range = {type: "binary", value: "..", position: node.position, lhs: item};
-                        advance("..");
-                        range.rhs = expression(0);
-                        item = range;
-                    }
-                    a.push(item);
-                    if (node.id !== ",") {
-                        break;
-                    }
-                    advance(",");
-                }
-            }
-            advance("]", true);
-            this.expressions = a;
-            this.type = "unary";
-            return this;
-        });
-
-        // filter - predicate or array index
-        infix("[", operators['['], function (left) {
-            if(node.id === "]") {
-                // empty predicate means maintain singleton arrays in the output
-                var step = left;
-                while(step && step.type === 'binary' && step.value === '[') {
-                    step = step.lhs;
-                }
-                step.keepArray = true;
-                advance("]");
-                return left;
-            } else {
-                this.lhs = left;
-                this.rhs = expression(operators[']']);
-                this.type = 'binary';
-                advance("]", true);
-                return this;
-            }
-        });
-
-        // order-by
-        infix("^", operators['^'], function (left) {
-            advance("(");
-            var terms = [];
-            for(;;) {
-                var term = {
-                    descending: false
-                };
-                if (node.id === "<") {
-                    // ascending sort
-                    advance("<");
-                } else if (node.id === ">") {
-                    // descending sort
-                    term.descending = true;
-                    advance(">");
-                } else {
-                    //unspecified - default to ascending
-                }
-                term.expression = expression(0);
-                terms.push(term);
-                if(node.id !== ",") {
-                    break;
-                }
-                advance(",");
-            }
-            advance(")");
-            this.lhs = left;
-            this.rhs = terms;
-            this.type = 'binary';
-            return this;
-        });
-
-        var objectParser = function (left) {
-            var a = [];
-            if (node.id !== "}") {
-                for (;;) {
-                    var n = expression(0);
-                    advance(":");
-                    var v = expression(0);
-                    a.push([n, v]); // holds an array of name/value expression pairs
-                    if (node.id !== ",") {
-                        break;
-                    }
-                    advance(",");
-                }
-            }
-            advance("}", true);
-            if(typeof left === 'undefined') {
-                // NUD - unary prefix form
-                this.lhs = a;
-                this.type = "unary";
-            } else {
-                // LED - binary infix form
-                this.lhs = left;
-                this.rhs = a;
-                this.type = 'binary';
-            }
-            return this;
-        };
-
-        // object constructor
-        prefix("{", objectParser);
-
-        // object grouping
-        infix("{", operators['{'], objectParser);
-
-        // if/then/else ternary operator ?:
-        infix("?", operators['?'], function (left) {
-            this.type = 'condition';
-            this.condition = left;
-            this.then = expression(0);
-            if (node.id === ':') {
-                // else condition
-                advance(":");
-                this.else = expression(0);
-            }
-            return this;
-        });
-
-        // object transformer
-        prefix("|", function () {
-            this.type = 'transform';
-            this.pattern = expression(0);
-            advance('|');
-            this.update = expression(0);
-            if(node.id === ',') {
-                advance(',');
-                this.delete = expression(0);
-            }
-            advance('|');
-            return this;
-        });
-
-        // tail call optimization
-        // this is invoked by the post parser to analyse lambda functions to see
-        // if they make a tail call.  If so, it is replaced by a thunk which will
-        // be invoked by the trampoline loop during function application.
-        // This enables tail-recursive functions to be written without growing the stack
-        var tail_call_optimize = function(expr) {
-            var result;
-            if(expr.type === 'function') {
-                var thunk = {type: 'lambda', thunk: true, arguments: [], position: expr.position};
-                thunk.body = expr;
-                result = thunk;
-            } else if(expr.type === 'condition') {
-                // analyse both branches
-                expr.then = tail_call_optimize(expr.then);
-                if(typeof expr.else !== 'undefined') {
-                    expr.else = tail_call_optimize(expr.else);
-                }
-                result = expr;
-            } else if(expr.type === 'block') {
-                // only the last expression in the block
-                var length = expr.expressions.length;
-                if(length > 0) {
-                    expr.expressions[length - 1] = tail_call_optimize(expr.expressions[length - 1]);
-                }
-                result = expr;
-            } else {
-                result = expr;
-            }
-            return result;
-        };
-
-        // post-parse stage
-        // the purpose of this is flatten the parts of the AST representing location paths,
-        // converting them to arrays of steps which in turn may contain arrays of predicates.
-        // following this, nodes containing '.' and '[' should be eliminated from the AST.
-        var ast_optimize = function (expr) {
-            var result;
-            switch (expr.type) {
-                case 'binary':
-                    switch (expr.value) {
-                        case '.':
-                            var lstep = ast_optimize(expr.lhs);
-                            result = {type: 'path', steps: []};
-                            if (lstep.type === 'path') {
-                                Array.prototype.push.apply(result.steps, lstep.steps);
-                            } else {
-                                result.steps = [lstep];
-                            }
-                            var rest = ast_optimize(expr.rhs);
-                            if(rest.type === 'function' &&
-                              rest.procedure.type === 'path' &&
-                              rest.procedure.steps.length === 1 &&
-                              rest.procedure.steps[0].type === 'name' &&
-                              result.steps[result.steps.length-1].type === 'function') {
-                                // next function in chain of functions - will override a thenable
-                                result.steps[result.steps.length-1].nextFunction = rest.procedure.steps[0].value;
-                            }
-                            if(rest.type !== 'path') {
-                                rest = {type: 'path', steps: [rest]};
-                            }
-                            Array.prototype.push.apply(result.steps, rest.steps);
-                            // any steps within a path that are literals, should be changed to 'name'
-                            result.steps.filter(function(step) {
-                                return step.type === 'literal';
-                            }).forEach(function(lit) {
-                                lit.type = 'name';
-                            });
-                            // any step that signals keeping a singleton array, should be flagged on the path
-                            if(result.steps.filter(function(step) { return step.keepArray === true;}).length > 0) {
-                                result.keepSingletonArray = true;
-                            }
-                            // if first step is a path constructor, flag it for special handling
-                            var firststep = result.steps[0];
-                            if(firststep.type === 'unary' && firststep.value === '[') {
-                                firststep.consarray = true;
-                            }
-                            // if the last step is an array constructor, flag it so it doesn't flatten
-                            var laststep = result.steps[result.steps.length - 1];
-                            if(laststep.type === 'unary' && laststep.value === '[') {
-                                laststep.consarray = true;
-                            }
-                            break;
-                        case '[':
-                            // predicated step
-                            // LHS is a step or a predicated step
-                            // RHS is the predicate expr
-                            result = ast_optimize(expr.lhs);
-                            var step = result;
-                            if(result.type === 'path') {
-                                step = result.steps[result.steps.length - 1];
-                            }
-                            if (typeof step.group !== 'undefined') {
-                                throw {
-                                    code: "S0209",
-                                    stack: (new Error()).stack,
-                                    position: expr.position
-                                };
-                            }
-                            if (typeof step.predicate === 'undefined') {
-                                step.predicate = [];
-                            }
-                            step.predicate.push(ast_optimize(expr.rhs));
-                            break;
-                        case '{':
-                            // group-by
-                            // LHS is a step or a predicated step
-                            // RHS is the object constructor expr
-                            result = ast_optimize(expr.lhs);
-                            if (typeof result.group !== 'undefined') {
-                                throw {
-                                    code: "S0210",
-                                    stack: (new Error()).stack,
-                                    position: expr.position
-                                };
-                            }
-                            // object constructor - process each pair
-                            result.group = {
-                                lhs: expr.rhs.map(function (pair) {
-                                    return [ast_optimize(pair[0]), ast_optimize(pair[1])];
-                                }),
-                                position: expr.position
-                            };
-                            break;
-                        case '^':
-                            // order-by
-                            // LHS is the array to be ordered
-                            // RHS defines the terms
-                            result = {type: 'sort', value: expr.value, position: expr.position};
-                            result.lhs = ast_optimize(expr.lhs);
-                            result.rhs = expr.rhs.map(function (terms) {
-                                return {
-                                    descending: terms.descending,
-                                    expression: ast_optimize(terms.expression)
-                                };
-                            });
-                            break;
-                        case ':=':
-                            result = {type: 'bind', value: expr.value, position: expr.position};
-                            result.lhs = ast_optimize(expr.lhs);
-                            result.rhs = ast_optimize(expr.rhs);
-                            break;
-                        case '~>':
-                            result = {type: 'apply', value: expr.value, position: expr.position};
-                            result.lhs = ast_optimize(expr.lhs);
-                            result.rhs = ast_optimize(expr.rhs);
-                            break;
-                        default:
-                            result = {type: expr.type, value: expr.value, position: expr.position};
-                            result.lhs = ast_optimize(expr.lhs);
-                            result.rhs = ast_optimize(expr.rhs);
-                    }
-                    break;
-                case 'unary':
-                    result = {type: expr.type, value: expr.value, position: expr.position};
-                    if (expr.value === '[') {
-                        // array constructor - process each item
-                        result.expressions = expr.expressions.map(function (item) {
-                            return ast_optimize(item);
-                        });
-                    } else if (expr.value === '{') {
-                        // object constructor - process each pair
-                        result.lhs = expr.lhs.map(function (pair) {
-                            return [ast_optimize(pair[0]), ast_optimize(pair[1])];
-                        });
-                    } else {
-                        // all other unary expressions - just process the expression
-                        result.expression = ast_optimize(expr.expression);
-                        // if unary minus on a number, then pre-process
-                        if (expr.value === '-' && result.expression.type === 'literal' && isNumeric(result.expression.value)) {
-                            result = result.expression;
-                            result.value = -result.value;
-                        }
-                    }
-                    break;
-                case 'function':
-                case 'partial':
-                    result = {type: expr.type, name: expr.name, value: expr.value, position: expr.position};
-                    result.arguments = expr.arguments.map(function (arg) {
-                        return ast_optimize(arg);
-                    });
-                    result.procedure = ast_optimize(expr.procedure);
-                    break;
-                case 'lambda':
-                    result = {type: expr.type, arguments: expr.arguments, signature: expr.signature, position: expr.position};
-                    var body = ast_optimize(expr.body);
-                    result.body = tail_call_optimize(body);
-                    break;
-                case 'condition':
-                    result = {type: expr.type, position: expr.position};
-                    result.condition = ast_optimize(expr.condition);
-                    result.then = ast_optimize(expr.then);
-                    if (typeof expr.else !== 'undefined') {
-                        result.else = ast_optimize(expr.else);
-                    }
-                    break;
-                case 'transform':
-                    result = {type: expr.type, position: expr.position};
-                    result.pattern = ast_optimize(expr.pattern);
-                    result.update = ast_optimize(expr.update);
-                    if(typeof expr.delete !== 'undefined') {
-                        result.delete = ast_optimize(expr.delete);
-                    }
-                    break;
-                case 'block':
-                    result = {type: expr.type, position: expr.position};
-                    // array of expressions - process each one
-                    result.expressions = expr.expressions.map(function (item) {
-                        return ast_optimize(item);
-                    });
-                    // TODO scan the array of expressions to see if any of them assign variables
-                    // if so, need to mark the block as one that needs to create a new frame
-                    break;
-                case 'name':
-                    result = {type: 'path', steps: [expr]};
-                    if(expr.keepArray) {
-                        result.keepSingletonArray = true;
-                    }
-                    break;
-                case 'literal':
-                case 'wildcard':
-                case 'descendant':
-                case 'variable':
-                case 'regex':
-                    result = expr;
-                    break;
-                case 'operator':
-                    // the tokens 'and' and 'or' might have been used as a name rather than an operator
-                    if (expr.value === 'and' || expr.value === 'or' || expr.value === 'in') {
-                        expr.type = 'name';
-                        result = ast_optimize(expr);
-                    } else /* istanbul ignore else */ if (expr.value === '?') {
-                        // partial application
-                        result = expr;
-                    } else {
-                        throw {
-                            code: "S0201",
-                            stack: (new Error()).stack,
-                            position: expr.position,
-                            token: expr.value
-                        };
-                    }
-                    break;
-                case 'error':
-                    result = expr;
-                    if(expr.lhs) {
-                        result = ast_optimize(expr.lhs);
-                    }
-                    break;
-                default:
-                    var code = "S0206";
-                    /* istanbul ignore else */
-                    if (expr.id === '(end)') {
-                        code = "S0207";
-                    }
-                    var err = {
-                        code: code,
-                        position: expr.position,
-                        token: expr.value
-                    };
-                    if(recover) {
-                        errors.push(err);
-                        return {type: 'error', error: err};
-                    } else {
-                        err.stack = (new Error()).stack;
-                        throw err;
-                    }
-            }
-            return result;
-        };
-
-        // now invoke the tokenizer and the parser and return the syntax tree
-        lexer = tokenizer(source);
-        advance();
-        // parse the tokens
-        var expr = expression(0);
-        if (node.id !== '(end)') {
-            var err = {
-                code: "S0201",
-                position: node.position,
-                token: node.value
-            };
-            handleError(err);
-        }
-        expr = ast_optimize(expr);
-
-        if(errors.length > 0) {
-            expr.errors = errors;
-        }
-
-        return expr;
-    };
-
-    // Start of Evaluator code
-
-    var staticFrame = createFrame(null);
-
-    /**
-     * Check if value is a finite number
-     * @param {float} n - number to evaluate
-     * @returns {boolean} True if n is a finite number
-     */
-    function isNumeric(n) {
-        var isNum = false;
-        if(typeof n === 'number') {
-            isNum = !isNaN(n);
-            if (isNum && !isFinite(n)) {
-                throw {
-                    code: "D1001",
-                    value: n,
-                    stack: (new Error()).stack
-                };
-            }
-        }
-        return isNum;
-    }
-
-    /**
-     * Returns true if the arg is an array of strings
-     * @param {*} arg - the item to test
-     * @returns {boolean} True if arg is an array of strings
-     */
-    function isArrayOfStrings(arg) {
-        var result = false;
-        /* istanbul ignore else */
-        if(Array.isArray(arg)) {
-            result = (arg.filter(function(item){return typeof item !== 'string';}).length === 0);
-        }
-        return result;
-    }
-
-    /**
-     * Returns true if the arg is an array of numbers
-     * @param {*} arg - the item to test
-     * @returns {boolean} True if arg is an array of numbers
-     */
-    function isArrayOfNumbers(arg) {
-        var result = false;
-        if(Array.isArray(arg)) {
-            result = (arg.filter(function(item){return !isNumeric(item);}).length === 0);
-        }
-        return result;
-    }
-
-    // Polyfill
-    /* istanbul ignore next */
-    Number.isInteger = Number.isInteger || function(value) {
-        return typeof value === "number" &&
-          isFinite(value) &&
-          Math.floor(value) === value;
-    };
-
-    /**
-     * Evaluate expression against input data
-     * @param {Object} expr - JSONata expression
-     * @param {Object} input - Input data to evaluate against
-     * @param {Object} environment - Environment
-     * @returns {*} Evaluated input data
-     */
-    function* evaluate(expr, input, environment) {
-        var result;
-
-        var entryCallback = environment.lookup('__evaluate_entry');
-        if(entryCallback) {
-            entryCallback(expr, input, environment);
-        }
-
-        switch (expr.type) {
-            case 'path':
-                result = yield * evaluatePath(expr, input, environment);
-                break;
-            case 'binary':
-                result = yield * evaluateBinary(expr, input, environment);
-                break;
-            case 'unary':
-                result = yield * evaluateUnary(expr, input, environment);
-                break;
-            case 'name':
-                result = evaluateName(expr, input, environment);
-                break;
-            case 'literal':
-                result = evaluateLiteral(expr, input, environment);
-                break;
-            case 'wildcard':
-                result = evaluateWildcard(expr, input, environment);
-                break;
-            case 'descendant':
-                result = evaluateDescendants(expr, input, environment);
-                break;
-            case 'condition':
-                result = yield * evaluateCondition(expr, input, environment);
-                break;
-            case 'block':
-                result = yield * evaluateBlock(expr, input, environment);
-                break;
-            case 'bind':
-                result = yield * evaluateBindExpression(expr, input, environment);
-                break;
-            case 'regex':
-                result = evaluateRegex(expr, input, environment);
-                break;
-            case 'function':
-                result = yield * evaluateFunction(expr, input, environment);
-                break;
-            case 'variable':
-                result = evaluateVariable(expr, input, environment);
-                break;
-            case 'lambda':
-                result = evaluateLambda(expr, input, environment);
-                break;
-            case 'partial':
-                result = yield * evaluatePartialApplication(expr, input, environment);
-                break;
-            case 'apply':
-                result = yield * evaluateApplyExpression(expr, input, environment);
-                break;
-            case 'sort':
-                result = yield * evaluateSortExpression(expr, input, environment);
-                break;
-            case 'transform':
-                result = evaluateTransformExpression(expr, input, environment);
-                break;
-        }
-
-        if(environment.lookup('__jsonata_async') &&
-          (typeof result === 'undefined' || result === null || typeof result.then !== 'function')) {
-            result = Promise.resolve(result);
-        }
-        if(environment.lookup('__jsonata_async') && typeof result.then === 'function' && expr.nextFunction && typeof result[expr.nextFunction] === 'function') {
-            // although this is a 'thenable', it is chaining a different function
-            // so don't yield since yielding will trigger the .then()
-        } else {
-            result = yield result;
-        }
-
-
-        if (expr.hasOwnProperty('predicate')) {
-            result = yield * applyPredicates(expr.predicate, result, environment);
-
-        }
-        if (expr.hasOwnProperty('group')) {
-            result = yield * evaluateGroupExpression(expr.group, result, environment);
-        }
-
-        var exitCallback = environment.lookup('__evaluate_exit');
-        if(exitCallback) {
-            exitCallback(expr, input, environment, result);
-        }
-
-        if(result && result.sequence) {
-            result = result.value();
-        }
-
-        return result;
-    }
-
-    /**
-     * Create an empty sequence to contain query results
-     * @returns {Array} - empty sequence
-     */
-    function createSequence() {
-        var sequence = toSequence([]);
-        if (arguments.length === 1) {
-            sequence.push(arguments[0]);
-        }
-        return sequence;
-    }
-
-    /**
-     * Converts an array to a result sequence (by adding special properties)
-     * @param {Array} arr - the array to convert
-     * @returns {*} - the sequence
-     */
-    function toSequence(arr) {
-        Object.defineProperty(arr, 'sequence', {
-            enumerable: false,
-            configurable: false,
-            get: function () {
-                return true;
-            }
-        });
-        Object.defineProperty(arr, 'keepSingleton', {
-            enumerable: false,
-            configurable: false,
-            writable: true,
-            value: false
-        });
-        Object.defineProperty(arr, 'value', {
-            enumerable: false,
-            configurable: false,
-            get: function () {
-                return function() {
-                    switch (this.length) {
-                        case 0:
-                            return undefined;
-                        case 1:
-                            return this.keepSingleton ? this : this[0];
-                        default:
-                            return this;
-                    }
-                };
-            }
-        });
-        return arr;
-    }
-
-    /**
-     * Evaluate path expression against input data
-     * @param {Object} expr - JSONata expression
-     * @param {Object} input - Input data to evaluate against
-     * @param {Object} environment - Environment
-     * @returns {*} Evaluated input data
-     */
-    function* evaluatePath(expr, input, environment) {
-        var inputSequence;
-        // expr is an array of steps
-        // if the first step is a variable reference ($...), including root reference ($$),
-        //   then the path is absolute rather than relative
-        if (expr.steps[0].type === 'variable') {
-            inputSequence = createSequence(input);  // dummy singleton sequence for first (absolute) step
-        } else if (Array.isArray(input)) {
-            inputSequence = input;
-        } else {
-            // if input is not an array, make it so
-            inputSequence = createSequence(input);
-        }
-
-        var resultSequence;
-
-        // evaluate each step in turn
-        for(var ii = 0; ii < expr.steps.length; ii++) {
-            var step = expr.steps[ii];
-
-            // if the first step is an explicit array constructor, then just evaluate that (i.e. don't iterate over a context array)
-            if(ii === 0 && step.consarray) {
-                resultSequence = yield * evaluate(step, inputSequence, environment);
-            } else {
-                resultSequence = yield * evaluateStep(step, inputSequence, environment, ii === expr.steps.length - 1);
-            }
-
-            if(typeof resultSequence === 'undefined' || resultSequence.length === 0) {
-                break;
-            }
-            inputSequence = resultSequence;
-        }
-
-        if(expr.keepSingletonArray) {
-            resultSequence.keepSingleton = true;
-        }
-
-        return resultSequence;
-    }
-
-    /**
-     * Evaluate a step within a path
-     * @param {Object} expr - JSONata expression
-     * @param {Object} input - Input data to evaluate against
-     * @param {Object} environment - Environment
-     * @param {boolean} lastStep - flag the last step in a path
-     * @returns {*} Evaluated input data
-     */
-    function* evaluateStep(expr, input, environment, lastStep) {
-        var result = createSequence();
-
-        for(var ii = 0; ii < input.length; ii++) {
-            var res = yield * evaluate(expr, input[ii], environment);
-            if(typeof res !== 'undefined') {
-                result.push(res);
-            }
-        }
-
-        var resultSequence = createSequence();
-        if(lastStep && result.length === 1 && Array.isArray(result[0]) && !result[0].sequence) {
-            resultSequence = result[0];
-        } else {
-            // flatten the sequence
-            result.forEach(function(res) {
-                if (!Array.isArray(res) || res.cons || res.keepSingleton) {
-                    // it's not an array - just push into the result sequence
-                    resultSequence.push(res);
-                } else {
-                    // res is a sequence - flatten it into the parent sequence
-                    Array.prototype.push.apply(resultSequence, res);
-                }
-            });
-        }
-
-        return resultSequence;
-    }
-
-    /**
-     * Apply predicates to input data
-     * @param {Object} predicates - Predicates
-     * @param {Object} input - Input data to apply predicates against
-     * @param {Object} environment - Environment
-     * @returns {*} Result after applying predicates
-     */
-    function* applyPredicates(predicates, input, environment) {
-        var inputSequence = input;
-        // lhs potentially holds an array
-        // we want to iterate over the array, and only keep the items that are
-        // truthy when applied to the predicate.
-        // if the predicate evaluates to an integer, then select that index
-
-        var results = createSequence();
-        for(var ii = 0; ii < predicates.length; ii++) {
-            var predicate = predicates[ii];
-            // if it's not an array, turn it into one
-            // since in XPath >= 2.0 an item is equivalent to a singleton sequence of that item
-            // if input is not an array, make it so
-            if (!Array.isArray(inputSequence)) {
-                inputSequence = createSequence(inputSequence);
-            }
-            results = createSequence();
-            if (predicate.type === 'literal' && isNumeric(predicate.value)) {
-                var index = predicate.value;
-                if (!Number.isInteger(index)) {
-                    // round it down
-                    index = Math.floor(index);
-                }
-                if (index < 0) {
-                    // count in from end of array
-                    index = inputSequence.length + index;
-                }
-                results = inputSequence[index];
-            } else {
-                results = yield * evaluateFilter(predicate, inputSequence, environment);
-            }
-            inputSequence = results;
-        }
-        return results;
-    }
-
-    /**
-     * Apply filter predicate to input data
-     * @param {Object} predicate - filter expression
-     * @param {Object} input - Input data to apply predicates against
-     * @param {Object} environment - Environment
-     * @returns {*} Result after applying predicates
-     */
-    function* evaluateFilter(predicate, input, environment) {
-        var results = createSequence();
-        for(var index = 0; index < input.length; index++) {
-            var item = input[index];
-            var res = yield * evaluate(predicate, item, environment);
-            if (isNumeric(res)) {
-                res = [res];
-            }
-            if(isArrayOfNumbers(res)) {
-                res.forEach(function(ires) {
-                    if (!Number.isInteger(ires)) {
-                        // round it down
-                        ires = Math.floor(ires);
-                    }
-                    if (ires < 0) {
-                        // count in from end of array
-                        ires = input.length + ires;
-                    }
-                    if (ires === index) {
-                        results.push(item);
-                    }
-                });
-            } else if (functionBoolean(res)) { // truthy
-                results.push(item);
-            }
-        }
-        return results;
-    }
-
-    /**
-     * Evaluate binary expression against input data
-     * @param {Object} expr - JSONata expression
-     * @param {Object} input - Input data to evaluate against
-     * @param {Object} environment - Environment
-     * @returns {*} Evaluated input data
-     */
-    function * evaluateBinary(expr, input, environment) {
-        var result;
-        var lhs = yield * evaluate(expr.lhs, input, environment);
-        var rhs = yield * evaluate(expr.rhs, input, environment);
-        var op = expr.value;
-
-        try {
-            switch (op) {
-                case '+':
-                case '-':
-                case '*':
-                case '/':
-                case '%':
-                    result = evaluateNumericExpression(lhs, rhs, op);
-                    break;
-                case '=':
-                case '!=':
-                case '<':
-                case '<=':
-                case '>':
-                case '>=':
-                    result = evaluateComparisonExpression(lhs, rhs, op);
-                    break;
-                case '&':
-                    result = evaluateStringConcat(lhs, rhs);
-                    break;
-                case 'and':
-                case 'or':
-                    result = evaluateBooleanExpression(lhs, rhs, op);
-                    break;
-                case '..':
-                    result = evaluateRangeExpression(lhs, rhs);
-                    break;
-                case 'in':
-                    result = evaluateIncludesExpression(lhs, rhs);
-                    break;
-            }
-        } catch(err) {
-            err.position = expr.position;
-            err.token = op;
-            throw err;
-        }
-        return result;
-    }
-
-    /**
-     * Evaluate unary expression against input data
-     * @param {Object} expr - JSONata expression
-     * @param {Object} input - Input data to evaluate against
-     * @param {Object} environment - Environment
-     * @returns {*} Evaluated input data
-     */
-    function* evaluateUnary(expr, input, environment) {
-        var result;
-
-        switch (expr.value) {
-            case '-':
-                result = yield * evaluate(expr.expression, input, environment);
-                if(typeof result === 'undefined') {
-                    result = undefined;
-                } else if (isNumeric(result)) {
-                    result = -result;
-                } else {
-                    throw {
-                        code: "D1002",
-                        stack: (new Error()).stack,
-                        position: expr.position,
-                        token: expr.value,
-                        value: result
-                    };
-                }
-                break;
-            case '[':
-                // array constructor - evaluate each item
-                result = [];
-                for(var ii = 0; ii < expr.expressions.length; ii++) {
-                    var item = expr.expressions[ii];
-                    var value = yield * evaluate(item, input, environment);
-                    if (typeof value !== 'undefined') {
-                        if(item.value === '[') {
-                            result.push(value);
-                        } else {
-                            result = functionAppend(result, value);
-                        }
-                    }
-                }
-                if(expr.consarray) {
-                    Object.defineProperty(result, 'cons', {
-                        enumerable: false,
-                        configurable: false,
-                        value: true
-                    });
-                }
-                break;
-            case '{':
-                // object constructor - apply grouping
-                result = yield * evaluateGroupExpression(expr, input, environment);
-                break;
-
-        }
-        return result;
-    }
-
-    /**
-     * Evaluate name object against input data
-     * @param {Object} expr - JSONata expression
-     * @param {Object} input - Input data to evaluate against
-     * @param {Object} environment - Environment
-     * @returns {*} Evaluated input data
-     */
-    function evaluateName(expr, input, environment) {
-        // lookup the 'name' item in the input
-        var result;
-        if (Array.isArray(input)) {
-            result = createSequence();
-            for(var ii = 0; ii < input.length; ii++) {
-                var res =  evaluateName(expr, input[ii], environment);
-                if (typeof res !== 'undefined') {
-                    result.push(res);
-                }
-            }
-        } else if (input !== null && typeof input === 'object') {
-            result = input[expr.value];
-        }
-        return result;
-    }
-
-    /**
-     * Evaluate literal against input data
-     * @param {Object} expr - JSONata expression
-     * @returns {*} Evaluated input data
-     */
-    function evaluateLiteral(expr) {
-        return expr.value;
-    }
-
-    /**
-     * Evaluate wildcard against input data
-     * @param {Object} expr - JSONata expression
-     * @param {Object} input - Input data to evaluate against
-     * @returns {*} Evaluated input data
-     */
-    function evaluateWildcard(expr, input) {
-        var results = createSequence();
-        if (input !== null && typeof input === 'object') {
-            Object.keys(input).forEach(function (key) {
-                var value = input[key];
-                if(Array.isArray(value)) {
-                    value = flatten(value);
-                    results = functionAppend(results, value);
-                } else {
-                    results.push(value);
-                }
-            });
-        }
-
-        //        result = normalizeSequence(results);
-        return results;
-    }
-
-    /**
-     * Returns a flattened array
-     * @param {Array} arg - the array to be flatten
-     * @param {Array} flattened - carries the flattened array - if not defined, will initialize to []
-     * @returns {Array} - the flattened array
-     */
-    function flatten(arg, flattened) {
-        if(typeof flattened === 'undefined') {
-            flattened = [];
-        }
-        if(Array.isArray(arg)) {
-            arg.forEach(function (item) {
-                flatten(item, flattened);
-            });
-        } else {
-            flattened.push(arg);
-        }
-        return flattened;
-    }
-
-    /**
-     * Evaluate descendants against input data
-     * @param {Object} expr - JSONata expression
-     * @param {Object} input - Input data to evaluate against
-     * @returns {*} Evaluated input data
-     */
-    function evaluateDescendants(expr, input) {
-        var result;
-        var resultSequence = createSequence();
-        if (typeof input !== 'undefined') {
-            // traverse all descendants of this object/array
-            recurseDescendants(input, resultSequence);
-            if (resultSequence.length === 1) {
-                result = resultSequence[0];
-            } else {
-                result = resultSequence;
-            }
-        }
-        return result;
-    }
-
-    /**
-     * Recurse through descendants
-     * @param {Object} input - Input data
-     * @param {Object} results - Results
-     */
-    function recurseDescendants(input, results) {
-        // this is the equivalent of //* in XPath
-        if (!Array.isArray(input)) {
-            results.push(input);
-        }
-        if (Array.isArray(input)) {
-            input.forEach(function (member) {
-                recurseDescendants(member, results);
-            });
-        } else if (input !== null && typeof input === 'object') {
-            Object.keys(input).forEach(function (key) {
-                recurseDescendants(input[key], results);
-            });
-        }
-    }
-
-    /**
-     * Evaluate numeric expression against input data
-     * @param {Object} lhs - LHS value
-     * @param {Object} rhs - RHS value
-     * @param {Object} op - opcode
-     * @returns {*} Result
-     */
-    function evaluateNumericExpression(lhs, rhs, op) {
-        var result;
-
-        if (typeof lhs === 'undefined' || typeof rhs === 'undefined') {
-            // if either side is undefined, the result is undefined
-            return result;
-        }
-
-        if (!isNumeric(lhs)) {
-            throw {
-                code: "T2001",
-                stack: (new Error()).stack,
-                value: lhs
-            };
-        }
-        if (!isNumeric(rhs)) {
-            throw {
-                code: "T2002",
-                stack: (new Error()).stack,
-                value: rhs
-            };
-        }
-
-        switch (op) {
-            case '+':
-                result = lhs + rhs;
-                break;
-            case '-':
-                result = lhs - rhs;
-                break;
-            case '*':
-                result = lhs * rhs;
-                break;
-            case '/':
-                result = lhs / rhs;
-                break;
-            case '%':
-                result = lhs % rhs;
-                break;
-        }
-        return result;
-    }
-
-    /**
-     * Evaluate comparison expression against input data
-     * @param {Object} lhs - LHS value
-     * @param {Object} rhs - RHS value
-     * @param {Object} op - opcode
-     * @returns {*} Result
-     */
-    function evaluateComparisonExpression(lhs, rhs, op) {
-        var result;
-
-        // type checks
-        var ltype = typeof lhs;
-        var rtype = typeof rhs;
-
-        if (ltype === 'undefined' || rtype === 'undefined') {
-            // if either side is undefined, the result is false
-            return false;
-        }
-
-        var validate = function() {
-            // if aa or bb are not string or numeric values, then throw an error
-            if (!(ltype === 'string' || ltype === 'number') || !(rtype === 'string' || rtype === 'number')) {
-                throw {
-                    code: "T2010",
-                    stack: (new Error()).stack,
-                    value: !(ltype === 'string' || ltype === 'number') ? lhs : rhs
-                };
-            }
-
-            //if aa and bb are not of the same type
-            if (ltype !== rtype) {
-                throw {
-                    code: "T2009",
-                    stack: (new Error()).stack,
-                    value: lhs,
-                    value2: rhs
-                };
-            }
-        };
-
-        switch (op) {
-            case '=':
-                result = lhs === rhs;
-                break;
-            case '!=':
-                result = (lhs !== rhs);
-                break;
-            case '<':
-                validate();
-                result = lhs < rhs;
-                break;
-            case '<=':
-                validate();
-                result = lhs <= rhs;
-                break;
-            case '>':
-                validate();
-                result = lhs > rhs;
-                break;
-            case '>=':
-                validate();
-                result = lhs >= rhs;
-                break;
-        }
-        return result;
-    }
-
-    /**
-     * Inclusion operator - in
-     *
-     * @param {Object} lhs - LHS value
-     * @param {Object} rhs - RHS value
-     * @returns {boolean} - true if lhs is a member of rhs
-     */
-    function evaluateIncludesExpression(lhs, rhs) {
-        var result = false;
-
-        if (typeof lhs === 'undefined' || typeof rhs === 'undefined') {
-            // if either side is undefined, the result is false
-            return false;
-        }
-
-        if(!Array.isArray(rhs)) {
-            rhs = [rhs];
-        }
-
-        for(var i = 0; i < rhs.length; i++) {
-            if(rhs[i] === lhs) {
-                result = true;
-                break;
-            }
-        }
-
-        return result;
-    }
-
-    /**
-     * Evaluate boolean expression against input data
-     * @param {Object} lhs - LHS value
-     * @param {Object} rhs - RHS value
-     * @param {Object} op - opcode
-     * @returns {*} Result
-     */
-    function evaluateBooleanExpression(lhs, rhs, op) {
-        var result;
-
-        switch (op) {
-            case 'and':
-                result = functionBoolean(lhs) && functionBoolean(rhs);
-                break;
-            case 'or':
-                result = functionBoolean(lhs) || functionBoolean(rhs);
-                break;
-        }
-        return result;
-    }
-
-    /**
-     * Evaluate string concatenation against input data
-     * @param {Object} lhs - LHS value
-     * @param {Object} rhs - RHS value
-     * @returns {string|*} Concatenated string
-     */
-    function evaluateStringConcat(lhs, rhs) {
-        var result;
-
-        var lstr = '';
-        var rstr = '';
-        if (typeof lhs !== 'undefined') {
-            lstr = functionString(lhs);
-        }
-        if (typeof rhs !== 'undefined') {
-            rstr = functionString(rhs);
-        }
-
-        result = lstr.concat(rstr);
-        return result;
-    }
-
-    /**
-     * Evaluate group expression against input data
-     * @param {Object} expr - JSONata expression
-     * @param {Object} input - Input data to evaluate against
-     * @param {Object} environment - Environment
-     * @returns {{}} Evaluated input data
-     */
-    function* evaluateGroupExpression(expr, input, environment) {
-        var result = {};
-        var groups = {};
-        // group the input sequence by 'key' expression
-        if (!Array.isArray(input)) {
-            input = createSequence(input);
-        }
-        for(var itemIndex = 0; itemIndex < input.length; itemIndex++) {
-            var item = input[itemIndex];
-            for(var pairIndex = 0; pairIndex < expr.lhs.length; pairIndex++) {
-                var pair = expr.lhs[pairIndex];
-                var key = yield * evaluate(pair[0], item, environment);
-                // key has to be a string
-                if (typeof  key !== 'string') {
-                    throw {
-                        code: "T1003",
-                        stack: (new Error()).stack,
-                        position: expr.position,
-                        value: key
-                    };
-                }
-                var entry = {data: item, expr: pair[1]};
-                if (groups.hasOwnProperty(key)) {
-                    // a value already exists in this slot
-                    // append it as an array
-                    groups[key].data = functionAppend(groups[key].data, item);
-                } else {
-                    groups[key] = entry;
-                }
-            }
-        }
-
-        // iterate over the groups to evaluate the 'value' expression
-        for (key in groups) {
-            entry = groups[key];
-            var value = yield * evaluate(entry.expr, entry.data, environment);
-            if(typeof value !== 'undefined') {
-                result[key] = value;
-            }
-        }
-
-        return result;
-    }
-
-    /**
-     * Evaluate range expression against input data
-     * @param {Object} lhs - LHS value
-     * @param {Object} rhs - RHS value
-     * @returns {Array} Resultant array
-     */
-    function evaluateRangeExpression(lhs, rhs) {
-        var result;
-
-        if (typeof lhs === 'undefined' || typeof rhs === 'undefined') {
-            // if either side is undefined, the result is undefined
-            return result;
-        }
-
-        if (lhs > rhs) {
-            // if the lhs is greater than the rhs, return undefined
-            return result;
-        }
-
-        if (!Number.isInteger(lhs)) {
-            throw {
-                code: "T2003",
-                stack: (new Error()).stack,
-                value: lhs
-            };
-        }
-        if (!Number.isInteger(rhs)) {
-            throw {
-                code: "T2004",
-                stack: (new Error()).stack,
-                value: rhs
-            };
-        }
-
-        result = new Array(rhs - lhs + 1);
-        for (var item = lhs, index = 0; item <= rhs; item++, index++) {
-            result[index] = item;
-        }
-        return toSequence(result);
-    }
-
-    /**
-     * Evaluate bind expression against input data
-     * @param {Object} expr - JSONata expression
-     * @param {Object} input - Input data to evaluate against
-     * @param {Object} environment - Environment
-     * @returns {*} Evaluated input data
-     */
-    function* evaluateBindExpression(expr, input, environment) {
-        // The RHS is the expression to evaluate
-        // The LHS is the name of the variable to bind to - should be a VARIABLE token
-        var value = yield * evaluate(expr.rhs, input, environment);
-        if (expr.lhs.type !== 'variable') {
-            throw {
-                code: "D2005",
-                stack: (new Error()).stack,
-                position: expr.position,
-                token: expr.value,
-                value: expr.lhs.type === 'path' ? expr.lhs.steps[0].value : expr.lhs.value
-            };
-        }
-        environment.bind(expr.lhs.value, value);
-        return value;
-    }
-
-    /**
-     * Evaluate condition against input data
-     * @param {Object} expr - JSONata expression
-     * @param {Object} input - Input data to evaluate against
-     * @param {Object} environment - Environment
-     * @returns {*} Evaluated input data
-     */
-    function* evaluateCondition(expr, input, environment) {
-        var result;
-        var condition = yield * evaluate(expr.condition, input, environment);
-        if (functionBoolean(condition)) {
-            result = yield * evaluate(expr.then, input, environment);
-        } else if (typeof expr.else !== 'undefined') {
-            result = yield * evaluate(expr.else, input, environment);
-        }
-        return result;
-    }
-
-    /**
-     * Evaluate block against input data
-     * @param {Object} expr - JSONata expression
-     * @param {Object} input - Input data to evaluate against
-     * @param {Object} environment - Environment
-     * @returns {*} Evaluated input data
-     */
-    function* evaluateBlock(expr, input, environment) {
-        var result;
-        // create a new frame to limit the scope of variable assignments
-        // TODO, only do this if the post-parse stage has flagged this as required
-        var frame = createFrame(environment);
-        // invoke each expression in turn
-        // only return the result of the last one
-        for(var ii = 0; ii < expr.expressions.length; ii++) {
-            result = yield * evaluate(expr.expressions[ii], input, frame);
-        }
-
-        return result;
-    }
-
-    /**
-     * Prepare a regex
-     * @param {Object} expr - expression containing regex
-     * @returns {Function} Higher order function representing prepared regex
-     */
-    function evaluateRegex(expr) {
-        expr.value.lastIndex = 0;
-        var closure = function(str) {
-            var re = expr.value;
-            var result;
-            var match = re.exec(str);
-            if(match !== null) {
-                result = {
-                    match: match[0],
-                    start: match.index,
-                    end: match.index + match[0].length,
-                    groups: []
-                };
-                if(match.length > 1) {
-                    for(var i = 1; i < match.length; i++) {
-                        result.groups.push(match[i]);
-                    }
-                }
-                result.next = function() {
-                    if(re.lastIndex >= str.length) {
-                        return undefined;
-                    } else {
-                        var next = closure(str);
-                        if(next && next.match === '' && re.lastIndex === expr.value.lastIndex) {
-                            // matches zero length string; this will never progress
-                            throw {
-                                code: "D1004",
-                                stack: (new Error()).stack,
-                                position: expr.position,
-                                value: expr.value.source
-                            };
-                        }
-                        return next;
-                    }
-                };
-            }
-
-            return result;
-        };
-        return closure;
-    }
-
-    /**
-     * Evaluate variable against input data
-     * @param {Object} expr - JSONata expression
-     * @param {Object} input - Input data to evaluate against
-     * @param {Object} environment - Environment
-     * @returns {*} Evaluated input data
-     */
-    function evaluateVariable(expr, input, environment) {
-        // lookup the variable value in the environment
-        var result;
-        // if the variable name is empty string, then it refers to context value
-        if (expr.value === '') {
-            result = input;
-        } else {
-            result = environment.lookup(expr.value);
-        }
-        return result;
-    }
-
-    /**
-     * sort / order-by operator
-     * @param {Object} expr - AST for operator
-     * @param {Object} input - Input data to evaluate against
-     * @param {Object} environment - Environment
-     * @returns {*} Ordered sequence
-     */
-    function* evaluateSortExpression(expr, input, environment) {
-        var result;
-
-        // evaluate the lhs, then sort the results in order according to rhs expression
-        var lhs = yield * evaluate(expr.lhs, input, environment);
-
-        // sort the lhs array
-        // use comparator function
-        var comparator = function(a, b) {
-            // expr.rhs is an array of order-by in priority order
-            var comp = 0;
-            for(var index = 0; comp === 0 && index < expr.rhs.length; index++) {
-                var term = expr.rhs[index];
-                //evaluate the rhs expression in the context of a
-                var aa = driveGenerator(term.expression, a, environment);
-                //evaluate the rhs expression in the context of b
-                var bb = driveGenerator(term.expression, b, environment);
-
-                // type checks
-                var atype = typeof aa;
-                var btype = typeof bb;
-                // undefined should be last in sort order
-                if(atype === 'undefined') {
-                    // swap them, unless btype is also undefined
-                    comp = (btype === 'undefined') ? 0 : 1;
-                    continue;
-                }
-                if(btype === 'undefined') {
-                    comp = -1;
-                    continue;
-                }
-
-                // if aa or bb are not string or numeric values, then throw an error
-                if(!(atype === 'string' || atype === 'number') || !(btype === 'string' || btype === 'number')) {
-                    throw {
-                        code: "T2008",
-                        stack: (new Error()).stack,
-                        position: expr.position,
-                        value: !(atype === 'string' || atype === 'number') ? aa : bb
-                    };
-                }
-
-                //if aa and bb are not of the same type
-                if(atype !== btype) {
-                    throw {
-                        code: "T2007",
-                        stack: (new Error()).stack,
-                        position: expr.position,
-                        value: aa,
-                        value2: bb
-                    };
-                }
-                if(aa === bb) {
-                    // both the same - move on to next term
-                    continue;
-                } else if (aa < bb) {
-                    comp = -1;
-                } else {
-                    comp = 1;
-                }
-                if(term.descending === true) {
-                    comp = -comp;
-                }
-            }
-            // only swap a & b if comp equals 1
-            return comp === 1;
-        };
-
-        result = functionSort(lhs, comparator);
-
-        return result;
-    }
-
-    /**
-     * create a transformer function
-     * @param {Object} expr - AST for operator
-     * @param {Object} input - Input data to evaluate against
-     * @param {Object} environment - Environment
-     * @returns {*} tranformer function
-     */
-    function evaluateTransformExpression(expr, input, environment) {
-        // create a function to implement the transform definition
-        var transformer = function*(obj) { // signature <(oa):o>
-            // undefined inputs always return undefined
-            if(typeof obj === 'undefined') {
-                return undefined;
-            }
-
-            // this function returns a copy of obj with changes specified by the pattern/operation
-            var cloneFunction = environment.lookup('clone');
-            if(!isFunction(cloneFunction)) {
-                // throw type error
-                throw {
-                    code: "T2013",
-                    stack: (new Error()).stack,
-                    position: expr.position
-                };
-            }
-            var result = yield * apply(cloneFunction, [obj], environment);
-            var matches = yield * evaluate(expr.pattern, result, environment);
-            if(typeof matches !== 'undefined') {
-                if(!Array.isArray(matches)) {
-                    matches = [matches];
-                }
-                for(var ii = 0; ii < matches.length; ii++) {
-                    var match = matches[ii];
-                    // evaluate the update value for each match
-                    var update = yield * evaluate(expr.update, match, environment);
-                    // update must be an object
-                    var updateType = typeof update;
-                    if(updateType !== 'undefined') {
-                        if(updateType !== 'object' || update === null) {
-                            // throw type error
-                            throw {
-                                code: "T2011",
-                                stack: (new Error()).stack,
-                                position: expr.update.position,
-                                value: update
-                            };
-                        }
-                        // merge the update
-                        for(var prop in update) {
-                            match[prop] = update[prop];
-                        }
-                    }
-
-                    // delete, if specified, must be an array of strings (or single string)
-                    if(typeof expr.delete !== 'undefined') {
-                        var deletions = yield * evaluate(expr.delete, match, environment);
-                        if(typeof deletions !== 'undefined') {
-                            var val = deletions;
-                            if (!Array.isArray(deletions)) {
-                                deletions = [deletions];
-                            }
-                            if (!isArrayOfStrings(deletions)) {
-                                // throw type error
-                                throw {
-                                    code: "T2012",
-                                    stack: (new Error()).stack,
-                                    position: expr.delete.position,
-                                    value: val
-                                };
-                            }
-                            for (var jj = 0; jj < deletions.length; jj++) {
-                                delete match[deletions[jj]];
-                            }
-                        }
-                    }
-                }
-            }
-
-            return result;
-        };
-
-        return defineFunction(transformer, '<(oa):o>');
-    }
-
-    /**
-     * Evaluate an expression by driving the generator to completion
-     * Used when it's not possible to yield
-     * @param {Object} expr - AST
-     * @param {Object} input - Input data to evaluate against
-     * @param {Object} environment - Environment
-     * @returns {*} result
-     */
-    function driveGenerator(expr, input, environment) {
-        var gen = evaluate(expr, input, environment);
-        // returns a generator - so iterate over it
-        var comp = gen.next();
-        while (!comp.done) {
-            comp = gen.next(comp.value);
-        }
-        return comp.value;
-    }
-
-    var chain = driveGenerator(parser('function($f, $g) { function($x){ $g($f($x)) } }'), null, staticFrame);
-
-    /**
-     * Apply the function on the RHS using the sequence on the LHS as the first argument
-     * @param {Object} expr - JSONata expression
-     * @param {Object} input - Input data to evaluate against
-     * @param {Object} environment - Environment
-     * @returns {*} Evaluated input data
-     */
-    function* evaluateApplyExpression(expr, input, environment) {
-        var result;
-
-
-        if(expr.rhs.type === 'function') {
-            // this is a function _invocation_; invoke it with lhs expression as the first argument
-            expr.rhs.arguments.unshift(expr.lhs);
-            result = yield * evaluateFunction(expr.rhs, input, environment);
-            expr.rhs.arguments.shift();
-        } else {
-            var lhs = yield * evaluate(expr.lhs, input, environment);
-            var func = yield * evaluate(expr.rhs, input, environment);
-
-            if(!isFunction(func)) {
-                throw {
-                    code: "T2006",
-                    stack: (new Error()).stack,
-                    position: expr.position,
-                    value: func
-                };
-            }
-
-            if(isFunction(lhs)) {
-                // this is function chaining (func1 ~> func2)
-                // λ($f, $g) { λ($x){ $g($f($x)) } }
-                result = yield * apply(chain, [lhs, func], environment);
-            } else {
-                result = yield * apply(func, [lhs], environment);
-            }
-
-        }
-
-        return result;
-    }
-
-    /**
-     *
-     * @param {Object} arg - expression to test
-     * @returns {boolean} - true if it is a function (lambda or built-in)
-     */
-    function isFunction(arg) {
-        return ((arg && (arg._jsonata_function === true || arg._jsonata_lambda === true)) || typeof arg === 'function');
-    }
-
-    /**
-     * Tests whether arg is a lambda function
-     * @param {*} arg - the value to test
-     * @returns {boolean} - true if it is a lambda function
-     */
-    function isLambda(arg) {
-        return arg && arg._jsonata_lambda === true;
-    }
-
-    /**
-     * @param {Object} arg - expression to test
-     * @returns {boolean} - true if it is a generator i.e. the result from calling a
-     * generator function
-     */
-    function isGenerator(arg) {
-        return (
-            typeof arg === 'object' &&
-            arg !== null &&
-            Symbol.iterator in arg &&
-            typeof arg[Symbol.iterator] === 'function' &&
-            'next' in arg &&
-            typeof arg.next === 'function'
-        );
-    }
-
-    /**
-     * Evaluate function against input data
-     * @param {Object} expr - JSONata expression
-     * @param {Object} input - Input data to evaluate against
-     * @param {Object} environment - Environment
-     * @param {Object} [applyto] - LHS of ~> operator
-     * @returns {*} Evaluated input data
-     */
-    function* evaluateFunction(expr, input, environment) {
-        var result;
-
-        // create the procedure
-        // can't assume that expr.procedure is a lambda type directly
-        // could be an expression that evaluates to a function (e.g. variable reference, parens expr etc.
-        // evaluate it generically first, then check that it is a function.  Throw error if not.
-        var proc = yield * evaluate(expr.procedure, input, environment);
-
-        if (typeof proc === 'undefined' && expr.procedure.type === 'path' && environment.lookup(expr.procedure.steps[0].value)) {
-            // help the user out here if they simply forgot the leading $
-            throw {
-                code: "T1005",
-                stack: (new Error()).stack,
-                position: expr.position,
-                token: expr.procedure.steps[0].value
-            };
-        }
-
-        var evaluatedArgs = [];
-        // eager evaluation - evaluate the arguments
-        for (var jj = 0; jj < expr.arguments.length; jj++) {
-            evaluatedArgs.push(yield* evaluate(expr.arguments[jj], input, environment));
-        }
-        // apply the procedure
-        try {
-            result = yield * apply(proc, evaluatedArgs, input);
-        } catch (err) {
-            // add the position field to the error
-            err.position = expr.position;
-            // and the function identifier
-            err.token = expr.procedure.type === 'path' ? expr.procedure.steps[0].value : expr.procedure.value;
-            throw err;
-        }
-        return result;
-    }
-
-    /**
-     * Apply procedure or function
-     * @param {Object} proc - Procedure
-     * @param {Array} args - Arguments
-     * @param {Object} self - Self
-     * @returns {*} Result of procedure
-     */
-    function* apply(proc, args, self) {
-        var result;
-        result = yield * applyInner(proc, args, self);
-        while(isLambda(result) && result.thunk === true) {
-            // trampoline loop - this gets invoked as a result of tail-call optimization
-            // the function returned a tail-call thunk
-            // unpack it, evaluate its arguments, and apply the tail call
-            var next = yield * evaluate(result.body.procedure, result.input, result.environment);
-            var evaluatedArgs = [];
-            for(var ii = 0; ii < result.body.arguments.length; ii++) {
-                evaluatedArgs.push(yield * evaluate(result.body.arguments[ii], result.input, result.environment));
-            }
-
-            result = yield * applyInner(next, evaluatedArgs, self);
-        }
-        return result;
-    }
-
-    /**
-     * Apply procedure or function
-     * @param {Object} proc - Procedure
-     * @param {Array} args - Arguments
-     * @param {Object} self - Self
-     * @returns {*} Result of procedure
-     */
-    function* applyInner(proc, args, self) {
-        var result;
-        var validatedArgs = args;
-        if(proc) {
-            validatedArgs = validateArguments(proc.signature, args, self);
-        }
-        if (isLambda(proc)) {
-            result = yield * applyProcedure(proc, validatedArgs);
-        } else if (proc && proc._jsonata_function === true) {
-            result = proc.implementation.apply(self, validatedArgs);
-            // `proc.implementation` might be a generator function
-            // and `result` might be a generator - if so, yield
-            if(isGenerator(result)) {
-                result = yield *result;
-            }
-        } else if (typeof proc === 'function') {
-            result = proc.apply(self, validatedArgs);
-            /* istanbul ignore next */
-            if(isGenerator(result)) {
-                result = yield *result;
-            }
-        } else {
-            throw {
-                code: "T1006",
-                stack: (new Error()).stack
-            };
-        }
-        return result;
-    }
-
-    /**
-     * Evaluate lambda against input data
-     * @param {Object} expr - JSONata expression
-     * @param {Object} input - Input data to evaluate against
-     * @param {Object} environment - Environment
-     * @returns {{lambda: boolean, input: *, environment: *, arguments: *, body: *}} Evaluated input data
-     */
-    function evaluateLambda(expr, input, environment) {
-        // make a function (closure)
-        var procedure = {
-            _jsonata_lambda: true,
-            input: input,
-            environment: environment,
-            arguments: expr.arguments,
-            signature: expr.signature,
-            body: expr.body
-        };
-        if(expr.thunk === true) {
-            procedure.thunk = true;
-        }
-        return procedure;
-    }
-
-    /**
-     * Evaluate partial application
-     * @param {Object} expr - JSONata expression
-     * @param {Object} input - Input data to evaluate against
-     * @param {Object} environment - Environment
-     * @returns {*} Evaluated input data
-     */
-    function* evaluatePartialApplication(expr, input, environment) {
-        // partially apply a function
-        var result;
-        // evaluate the arguments
-        var evaluatedArgs = [];
-        for(var ii = 0; ii < expr.arguments.length; ii++) {
-            var arg = expr.arguments[ii];
-            if (arg.type === 'operator' && arg.value === '?') {
-                evaluatedArgs.push(arg);
-            } else {
-                evaluatedArgs.push(yield * evaluate(arg, input, environment));
-            }
-        }
-        // lookup the procedure
-        var proc = yield * evaluate(expr.procedure, input, environment);
-        if (typeof proc === 'undefined' && expr.procedure.type === 'path' && environment.lookup(expr.procedure.steps[0].value)) {
-            // help the user out here if they simply forgot the leading $
-            throw {
-                code: "T1007",
-                stack: (new Error()).stack,
-                position: expr.position,
-                token: expr.procedure.steps[0].value
-            };
-        }
-        if (isLambda(proc)) {
-            result = partialApplyProcedure(proc, evaluatedArgs);
-        } else if (proc && proc._jsonata_function === true) {
-            result = partialApplyNativeFunction(proc.implementation, evaluatedArgs);
-        } else if (typeof proc === 'function') {
-            result = partialApplyNativeFunction(proc, evaluatedArgs);
-        } else {
-            throw {
-                code: "T1008",
-                stack: (new Error()).stack,
-                position: expr.position,
-                token: expr.procedure.type === 'path' ? expr.procedure.steps[0].value : expr.procedure.value
-            };
-        }
-        return result;
-    }
-
-    /**
-     * Validate the arguments against the signature validator (if it exists)
-     * @param {Function} signature - validator function
-     * @param {Array} args - function arguments
-     * @param {*} context - context value
-     * @returns {Array} - validated arguments
-     */
-    function validateArguments(signature, args, context) {
-        if(typeof signature === 'undefined') {
-            // nothing to validate
-            return args;
-        }
-        var validatedArgs = signature.validate(args, context);
-        return validatedArgs;
-    }
-
-    /**
-     * Apply procedure
-     * @param {Object} proc - Procedure
-     * @param {Array} args - Arguments
-     * @returns {*} Result of procedure
-     */
-    function* applyProcedure(proc, args) {
-        var result;
-        var env = createFrame(proc.environment);
-        proc.arguments.forEach(function (param, index) {
-            env.bind(param.value, args[index]);
-        });
-        if (typeof proc.body === 'function') {
-            // this is a lambda that wraps a native function - generated by partially evaluating a native
-            result = yield * applyNativeFunction(proc.body, env);
-        } else {
-            result = yield * evaluate(proc.body, proc.input, env);
-        }
-        return result;
-    }
-
-    /**
-     * Partially apply procedure
-     * @param {Object} proc - Procedure
-     * @param {Array} args - Arguments
-     * @returns {{lambda: boolean, input: *, environment: {bind, lookup}, arguments: Array, body: *}} Result of partially applied procedure
-     */
-    function partialApplyProcedure(proc, args) {
-        // create a closure, bind the supplied parameters and return a function that takes the remaining (?) parameters
-        var env = createFrame(proc.environment);
-        var unboundArgs = [];
-        proc.arguments.forEach(function (param, index) {
-            var arg = args[index];
-            if (arg && arg.type === 'operator' && arg.value === '?') {
-                unboundArgs.push(param);
-            } else {
-                env.bind(param.value, arg);
-            }
-        });
-        var procedure = {
-            _jsonata_lambda: true,
-            input: proc.input,
-            environment: env,
-            arguments: unboundArgs,
-            body: proc.body
-        };
-        return procedure;
-    }
-
-    /**
-     * Partially apply native function
-     * @param {Function} native - Native function
-     * @param {Array} args - Arguments
-     * @returns {{lambda: boolean, input: *, environment: {bind, lookup}, arguments: Array, body: *}} Result of partially applying native function
-     */
-    function partialApplyNativeFunction(native, args) {
-        // create a lambda function that wraps and invokes the native function
-        // get the list of declared arguments from the native function
-        // this has to be picked out from the toString() value
-        var sigArgs = getNativeFunctionArguments(native);
-        sigArgs = sigArgs.map(function (sigArg) {
-            return '$' + sigArg.trim();
-        });
-        var body = 'function(' + sigArgs.join(', ') + '){ _ }';
-
-        var bodyAST = parser(body);
-        bodyAST.body = native;
-
-        var partial = partialApplyProcedure(bodyAST, args);
-        return partial;
-    }
-
-    /**
-     * Apply native function
-     * @param {Object} proc - Procedure
-     * @param {Object} env - Environment
-     * @returns {*} Result of applying native function
-     */
-    function* applyNativeFunction(proc, env) {
-        var sigArgs = getNativeFunctionArguments(proc);
-        // generate the array of arguments for invoking the function - look them up in the environment
-        var args = sigArgs.map(function (sigArg) {
-            return env.lookup(sigArg.trim());
-        });
-
-        var result = proc.apply(null, args);
-        if(isGenerator(result)) {
-            result = yield * result;
-        }
-        return result;
-    }
-
-    /**
-     * Get native function arguments
-     * @param {Function} func - Function
-     * @returns {*|Array} Native function arguments
-     */
-    function getNativeFunctionArguments(func) {
-        var signature = func.toString();
-        var sigParens = /\(([^)]*)\)/.exec(signature)[1]; // the contents of the parens
-        var sigArgs = sigParens.split(',');
-        return sigArgs;
-    }
-
-    /**
-     * Creates a function definition
-     * @param {Function} func - function implementation in Javascript
-     * @param {string} signature - JSONata function signature definition
-     * @returns {{implementation: *, signature: *}} function definition
-     */
-    function defineFunction(func, signature) {
-        var definition = {
-            _jsonata_function: true,
-            implementation: func
-        };
-        if(typeof signature !== 'undefined') {
-            definition.signature = parseSignature(signature);
-        }
-        return definition;
-    }
-
-    /**
-     * Sum function
-     * @param {Object} args - Arguments
-     * @returns {number} Total value of arguments
-     */
-    function functionSum(args) {
-        // undefined inputs always return undefined
-        if(typeof args === 'undefined') {
-            return undefined;
-        }
-
-        var total = 0;
-        args.forEach(function(num){total += num;});
-        return total;
-    }
-
-    /**
-     * Count function
-     * @param {Object} args - Arguments
-     * @returns {number} Number of elements in the array
-     */
-    function functionCount(args) {
-        // undefined inputs always return undefined
-        if(typeof args === 'undefined') {
-            return 0;
-        }
-
-        return args.length;
-    }
-
-    /**
-     * Max function
-     * @param {Object} args - Arguments
-     * @returns {number} Max element in the array
-     */
-    function functionMax(args) {
-        // undefined inputs always return undefined
-        if(typeof args === 'undefined' || args.length === 0) {
-            return undefined;
-        }
-
-        return Math.max.apply(Math, args);
-    }
-
-    /**
-     * Min function
-     * @param {Object} args - Arguments
-     * @returns {number} Min element in the array
-     */
-    function functionMin(args) {
-        // undefined inputs always return undefined
-        if(typeof args === 'undefined' || args.length === 0) {
-            return undefined;
-        }
-
-        return Math.min.apply(Math, args);
-    }
-
-    /**
-     * Average function
-     * @param {Object} args - Arguments
-     * @returns {number} Average element in the array
-     */
-    function functionAverage(args) {
-        // undefined inputs always return undefined
-        if(typeof args === 'undefined' || args.length === 0) {
-            return undefined;
-        }
-
-        var total = 0;
-        args.forEach(function(num){total += num;});
-        return total/args.length;
-    }
-
-    /**
-     * Stingify arguments
-     * @param {Object} arg - Arguments
-     * @returns {String} String from arguments
-     */
-    function functionString(arg) {
-        // undefined inputs always return undefined
-        if(typeof arg === 'undefined') {
-            return undefined;
-        }
-
-        var str;
-
-        if (typeof arg === 'string') {
-            // already a string
-            str = arg;
-        } else if(isFunction(arg)) {
-            // functions (built-in and lambda convert to empty string
-            str = '';
-        } else if (typeof arg === 'number' && !isFinite(arg)) {
-            throw {
-                code: "D3001",
-                value: arg,
-                stack: (new Error()).stack
-            };
-        } else
-            str = JSON.stringify(arg, function (key, val) {
-                return (typeof val !== 'undefined' && val !== null && val.toPrecision && isNumeric(val)) ? Number(val.toPrecision(13)) :
-                    (val && isFunction(val)) ? '' : val;
-            });
-        return str;
-    }
-
-    /**
-     * Create substring based on character number and length
-     * @param {String} str - String to evaluate
-     * @param {Integer} start - Character number to start substring
-     * @param {Integer} [length] - Number of characters in substring
-     * @returns {string|*} Substring
-     */
-    function functionSubstring(str, start, length) {
-        // undefined inputs always return undefined
-        if(typeof str === 'undefined') {
-            return undefined;
-        }
-
-        return str.substr(start, length);
-    }
-
-    /**
-     * Create substring up until a character
-     * @param {String} str - String to evaluate
-     * @param {String} chars - Character to define substring boundary
-     * @returns {*} Substring
-     */
-    function functionSubstringBefore(str, chars) {
-        // undefined inputs always return undefined
-        if(typeof str === 'undefined') {
-            return undefined;
-        }
-
-        var pos = str.indexOf(chars);
-        if (pos > -1) {
-            return str.substr(0, pos);
-        } else {
-            return str;
-        }
-    }
-
-    /**
-     * Create substring after a character
-     * @param {String} str - String to evaluate
-     * @param {String} chars - Character to define substring boundary
-     * @returns {*} Substring
-     */
-    function functionSubstringAfter(str, chars) {
-        // undefined inputs always return undefined
-        if(typeof str === 'undefined') {
-            return undefined;
-        }
-
-        var pos = str.indexOf(chars);
-        if (pos > -1) {
-            return str.substr(pos + chars.length);
-        } else {
-            return str;
-        }
-    }
-
-    /**
-     * Lowercase a string
-     * @param {String} str - String to evaluate
-     * @returns {string} Lowercase string
-     */
-    function functionLowercase(str) {
-        // undefined inputs always return undefined
-        if(typeof str === 'undefined') {
-            return undefined;
-        }
-
-        return str.toLowerCase();
-    }
-
-    /**
-     * Uppercase a string
-     * @param {String} str - String to evaluate
-     * @returns {string} Uppercase string
-     */
-    function functionUppercase(str) {
-        // undefined inputs always return undefined
-        if(typeof str === 'undefined') {
-            return undefined;
-        }
-
-        return str.toUpperCase();
-    }
-
-    /**
-     * length of a string
-     * @param {String} str - string
-     * @returns {Number} The number of characters in the string
-     */
-    function functionLength(str) {
-        // undefined inputs always return undefined
-        if(typeof str === 'undefined') {
-            return undefined;
-        }
-
-        return str.length;
-    }
-
-    /**
-     * Normalize and trim whitespace within a string
-     * @param {string} str - string to be trimmed
-     * @returns {string} - trimmed string
-     */
-    function functionTrim(str) {
-        // undefined inputs always return undefined
-        if(typeof str === 'undefined') {
-            return undefined;
-        }
-
-        // normalize whitespace
-        var result = str.replace(/[ \t\n\r]+/gm, ' ');
-        if(result.charAt(0) === ' ') {
-            // strip leading space
-            result = result.substring(1);
-        }
-        if(result.charAt(result.length - 1) === ' ') {
-            // strip trailing space
-            result = result.substring(0, result.length - 1);
-        }
-        return result;
-    }
-
-    /**
-     * Pad a string to a minimum width by adding characters to the start or end
-     * @param {string} str - string to be padded
-     * @param {number} width - the minimum width; +ve pads to the right, -ve pads to the left
-     * @param {string} [char] - the pad character(s); defaults to ' '
-     * @returns {string} - padded string
-     */
-    function functionPad(str, width, char) {
-        // undefined inputs always return undefined
-        if(typeof str === 'undefined') {
-            return undefined;
-        }
-
-        if(typeof char === 'undefined' || char.length === 0) {
-            char = ' ';
-        }
-
-        var result;
-        var padLength = Math.abs(width) - str.length;
-        if(padLength > 0) {
-            var padding = (new Array(padLength + 1)).join(char);
-            if(char.length > 1) {
-                padding = padding.substring(0, padLength);
-            }
-            if(width > 0) {
-                result = str + padding;
-            } else {
-                result = padding + str;
-            }
-        } else {
-            result = str;
-        }
-        return result;
-    }
-
-    /**
-     * Tests if the str contains the token
-     * @param {String} str - string to test
-     * @param {String} token - substring or regex to find
-     * @returns {Boolean} - true if str contains token
-     */
-    function functionContains(str, token) {
-        // undefined inputs always return undefined
-        if(typeof str === 'undefined') {
-            return undefined;
-        }
-
-        var result;
-
-        if(typeof token === 'string') {
-            result = (str.indexOf(token) !== -1);
-        } else {
-            var matches = token(str);
-            result = (typeof matches !== 'undefined');
-        }
-
-        return result;
-    }
-
-    /**
-     * Match a string with a regex returning an array of object containing details of each match
-     * @param {String} str - string
-     * @param {String} regex - the regex applied to the string
-     * @param {Integer} [limit] - max number of matches to return
-     * @returns {Array} The array of match objects
-     */
-    function functionMatch(str, regex, limit) {
-        // undefined inputs always return undefined
-        if(typeof str === 'undefined') {
-            return undefined;
-        }
-
-        // limit, if specified, must be a non-negative number
-        if(limit < 0) {
-            throw {
-                stack: (new Error()).stack,
-                value: limit,
-                code: 'D3040',
-                index: 3
-            };
-        }
-
-        var result = createSequence();
-
-        if(typeof limit === 'undefined' || limit > 0) {
-            var count = 0;
-            var matches = regex(str);
-            if (typeof matches !== 'undefined') {
-                while (typeof matches !== 'undefined' && (typeof limit === 'undefined' || count < limit)) {
-                    result.push({
-                        match: matches.match,
-                        index: matches.start,
-                        groups: matches.groups
-                    });
-                    matches = matches.next();
-                    count++;
-                }
-            }
-        }
-
-        return result;
-    }
-
-    /**
-     * Match a string with a regex returning an array of object containing details of each match
-     * @param {String} str - string
-     * @param {String} pattern - the substring/regex applied to the string
-     * @param {String} replacement - text to replace the matched substrings
-     * @param {Integer} [limit] - max number of matches to return
-     * @returns {Array} The array of match objects
-     */
-    function* functionReplace(str, pattern, replacement, limit) {
-        // undefined inputs always return undefined
-        if(typeof str === 'undefined') {
-            return undefined;
-        }
-
-        // pattern cannot be an empty string
-        if(pattern === '') {
-            throw {
-                code: "D3010",
-                stack: (new Error()).stack,
-                value: pattern,
-                index: 2
-            };
-        }
-
-        // limit, if specified, must be a non-negative number
-        if(limit < 0) {
-            throw {
-                code: "D3011",
-                stack: (new Error()).stack,
-                value: limit,
-                index: 4
-            };
-        }
-
-        var replacer;
-        if(typeof replacement === 'string') {
-            replacer = function (regexMatch) {
-                var substitute = '';
-                // scan forward, copying the replacement text into the substitute string
-                // and replace any occurrence of $n with the values matched by the regex
-                var position = 0;
-                var index = replacement.indexOf('$', position);
-                while (index !== -1 && position < replacement.length) {
-                    substitute += replacement.substring(position, index);
-                    position = index + 1;
-                    var dollarVal = replacement.charAt(position);
-                    if (dollarVal === '$') {
-                        // literal $
-                        substitute += '$';
-                        position++;
-                    } else if (dollarVal === '0') {
-                        substitute += regexMatch.match;
-                        position++;
-                    } else {
-                        var maxDigits;
-                        if(regexMatch.groups.length === 0) {
-                            // no sub-matches; any $ followed by a digit will be replaced by an empty string
-                            maxDigits = 1;
-                        } else {
-                            // max number of digits to parse following the $
-                            maxDigits = Math.floor(Math.log(regexMatch.groups.length) * Math.LOG10E) + 1;
-                        }
-                        index = parseInt(replacement.substring(position, position + maxDigits), 10);
-                        if(maxDigits > 1 && index > regexMatch.groups.length) {
-                            index = parseInt(replacement.substring(position, position + maxDigits - 1), 10);
-                        }
-                        if (!isNaN(index)) {
-                            if(regexMatch.groups.length > 0 ) {
-                                var submatch = regexMatch.groups[index - 1];
-                                if (typeof submatch !== 'undefined') {
-                                    substitute += submatch;
-                                }
-                            }
-                            position += index.toString().length;
-                        } else {
-                            // not a capture group, treat the $ as literal
-                            substitute += '$';
-                        }
-                    }
-                    index = replacement.indexOf('$', position);
-                }
-                substitute += replacement.substring(position);
-                return substitute;
-            };
-        } else {
-            replacer = replacement;
-        }
-
-        var result = '';
-        var position = 0;
-
-        if(typeof limit === 'undefined' || limit > 0) {
-            var count = 0;
-            if(typeof pattern === 'string') {
-                var index = str.indexOf(pattern, position);
-                while(index !== -1 && (typeof limit === 'undefined' || count < limit)) {
-                    result += str.substring(position, index);
-                    result += replacement;
-                    position = index + pattern.length;
-                    count++;
-                    index = str.indexOf(pattern, position);
-                }
-                result += str.substring(position);
-            } else {
-                var matches = pattern(str);
-                if (typeof matches !== 'undefined') {
-                    while (typeof matches !== 'undefined' && (typeof limit === 'undefined' || count < limit)) {
-                        result += str.substring(position, matches.start);
-                        var replacedWith = yield * apply(replacer, [matches], null);
-                        // check replacedWith is a string
-                        if(typeof replacedWith === 'string') {
-                            result += replacedWith;
-                        } else {
-                            // not a string - throw error
-                            throw {
-                                code: "D3012",
-                                stack: (new Error()).stack,
-                                value: replacedWith
-                            };
-                        }
-                        position = matches.start + matches.match.length;
-                        count++;
-                        matches = matches.next();
-                    }
-                    result += str.substring(position);
-                } else {
-                    result = str;
-                }
-            }
-        } else {
-            result = str;
-        }
-
-        return result;
-    }
-
-    /**
-     * Base64 encode a string
-     * @param {String} str - string
-     * @returns {String} Base 64 encoding of the binary data
-     */
-    function functionBase64encode(str) {
-        // undefined inputs always return undefined
-        if(typeof str === 'undefined') {
-            return undefined;
-        }
-        // Use btoa in a browser, or Buffer in Node.js
-
-        var btoa = typeof window !== 'undefined' ?
-            /* istanbul ignore next */ window.btoa :
-            function(str) {
-                // Simply doing `new Buffer` at this point causes Browserify to pull
-                // in the entire Buffer browser library, which is large and unnecessary.
-                // Using `global.Buffer` defeats this.
-                return new global.Buffer(str, 'binary').toString('base64');
-            };
-        return btoa(str);
-    }
-
-    /**
-     * Base64 decode a string
-     * @param {String} str - string
-     * @returns {String} Base 64 encoding of the binary data
-     */
-    function functionBase64decode(str) {
-        // undefined inputs always return undefined
-        if(typeof str === 'undefined') {
-            return undefined;
-        }
-        // Use btoa in a browser, or Buffer in Node.js
-        var atob = typeof window !== 'undefined' ?
-            /* istanbul ignore next */ window.atob :
-            function(str) {
-                // Simply doing `new Buffer` at this point causes Browserify to pull
-                // in the entire Buffer browser library, which is large and unnecessary.
-                // Using `global.Buffer` defeats this.
-                return new global.Buffer(str, 'base64').toString('binary');
-            };
-        return atob(str);
-    }
-
-    /**
-     * Split a string into an array of substrings
-     * @param {String} str - string
-     * @param {String} separator - the token or regex that splits the string
-     * @param {Integer} [limit] - max number of substrings
-     * @returns {Array} The array of string
-     */
-    function functionSplit(str, separator, limit) {
-        // undefined inputs always return undefined
-        if(typeof str === 'undefined') {
-            return undefined;
-        }
-
-        // limit, if specified, must be a non-negative number
-        if(limit < 0) {
-            throw {
-                code: "D3020",
-                stack: (new Error()).stack,
-                value: limit,
-                index: 3
-            };
-        }
-
-        var result = [];
-
-        if(typeof limit === 'undefined' || limit > 0) {
-            if (typeof separator === 'string') {
-                result = str.split(separator, limit);
-            } else {
-                var count = 0;
-                var matches = separator(str);
-                if (typeof matches !== 'undefined') {
-                    var start = 0;
-                    while (typeof matches !== 'undefined' && (typeof limit === 'undefined' || count < limit)) {
-                        result.push(str.substring(start, matches.start));
-                        start = matches.end;
-                        matches = matches.next();
-                        count++;
-                    }
-                    if(typeof limit === 'undefined' || count < limit) {
-                        result.push(str.substring(start));
-                    }
-                } else {
-                    result.push(str);
-                }
-            }
-        }
-
-        return result;
-    }
-
-    /**
-     * Join an array of strings
-     * @param {Array} strs - array of string
-     * @param {String} [separator] - the token that splits the string
-     * @returns {String} The concatenated string
-     */
-    function functionJoin(strs, separator) {
-        // undefined inputs always return undefined
-        if(typeof strs === 'undefined') {
-            return undefined;
-        }
-
-        // if separator is not specified, default to empty string
-        if(typeof separator === 'undefined') {
-            separator = "";
-        }
-
-        return strs.join(separator);
-    }
-
-    /**
-     * Formats a number into a decimal string representation using XPath 3.1 F&O fn:format-number spec
-     * @param {number} value - number to format
-     * @param {String} picture - picture string definition
-     * @param {Object} [options] - override locale defaults
-     * @returns {String} The formatted string
-     */
-    function functionFormatNumber(value, picture, options) {
-        var defaults = {
-            "decimal-separator": ".",
-            "grouping-separator": ",",
-            "exponent-separator": "e",
-            "infinity": "Infinity",
-            "minus-sign": "-",
-            "NaN": "NaN",
-            "percent": "%",
-            "per-mille": "\u2030",
-            "zero-digit": "0",
-            "digit": "#",
-            "pattern-separator": ";"
-        };
-
-        // if `options` is specified, then its entries override defaults
-        var properties = defaults;
-        if(typeof options !== 'undefined') {
-            Object.keys(options).forEach(function (key) {
-                properties[key] = options[key];
-            });
-        }
-
-        var decimalDigitFamily = [];
-        var zeroCharCode = properties['zero-digit'].charCodeAt(0);
-        for(var ii = zeroCharCode; ii < zeroCharCode + 10; ii++) {
-            decimalDigitFamily.push(String.fromCharCode(ii));
-        }
-
-        var activeChars = decimalDigitFamily.concat([properties['decimal-separator'], properties['exponent-separator'], properties['grouping-separator'], properties.digit, properties['pattern-separator']]);
-
-        var subPictures = picture.split(properties['pattern-separator']);
-
-        if(subPictures.length > 2) {
-            throw {
-                code: 'D3080',
-                stack: (new Error()).stack
-            };
-        }
-
-        var splitParts = function(subpicture) {
-            var prefix = (function() {
-                var ch;
-                for(var ii = 0; ii < subpicture.length; ii++) {
-                    ch = subpicture.charAt(ii);
-                    if(activeChars.indexOf(ch) !== -1 && ch !== properties['exponent-separator']) {
-                        return subpicture.substring(0, ii);
-                    }
-                }
-            })();
-            var suffix = (function() {
-                var ch;
-                for(var ii = subpicture.length - 1; ii >= 0; ii--) {
-                    ch = subpicture.charAt(ii);
-                    if(activeChars.indexOf(ch) !== -1 && ch !== properties['exponent-separator']) {
-                        return subpicture.substring(ii + 1);
-                    }
-                }
-            })();
-            var activePart = subpicture.substring(prefix.length, subpicture.length - suffix.length);
-            var mantissaPart, exponentPart, integerPart, fractionalPart;
-            var exponentPosition = subpicture.indexOf(properties['exponent-separator'], prefix.length);
-            if(exponentPosition === -1 || exponentPosition > subpicture.length - suffix.length) {
-                mantissaPart = activePart;
-                exponentPart = undefined;
-            } else {
-                mantissaPart = activePart.substring(0, exponentPosition);
-                exponentPart = activePart.substring(exponentPosition + 1);
-            }
-            var decimalPosition = mantissaPart.indexOf(properties['decimal-separator']);
-            if(decimalPosition === -1) {
-                integerPart = mantissaPart;
-                fractionalPart = suffix;
-            } else {
-                integerPart = mantissaPart.substring(0, decimalPosition);
-                fractionalPart = mantissaPart.substring(decimalPosition + 1);
-            }
-            return {
-                prefix: prefix,
-                suffix: suffix,
-                activePart: activePart,
-                mantissaPart: mantissaPart,
-                exponentPart: exponentPart,
-                integerPart: integerPart,
-                fractionalPart: fractionalPart,
-                subpicture: subpicture
-            };
-        };
-
-        // validate the picture string, F&O 4.7.3
-        var validate = function(parts) {
-            var error;
-            var ii;
-            var subpicture = parts.subpicture;
-            var decimalPos = subpicture.indexOf(properties['decimal-separator']);
-            if(decimalPos !== subpicture.lastIndexOf(properties['decimal-separator'])) {
-                error = 'D3081';
-            }
-            if(subpicture.indexOf(properties.percent) !== subpicture.lastIndexOf(properties.percent)) {
-                error = 'D3082';
-            }
-            if(subpicture.indexOf(properties['per-mille']) !== subpicture.lastIndexOf(properties['per-mille'])) {
-                error = 'D3083';
-            }
-            if(subpicture.indexOf(properties.percent) !== -1 && subpicture.indexOf(properties['per-mille']) !== -1) {
-                error = 'D3084';
-            }
-            var valid = false;
-            for(ii = 0; ii < parts.mantissaPart.length; ii++) {
-                var ch = parts.mantissaPart.charAt(ii);
-                if(decimalDigitFamily.indexOf(ch) !== -1 || ch === properties.digit) {
-                    valid = true;
-                    break;
-                }
-            }
-            if(!valid) {
-                error = 'D3085';
-            }
-            var charTypes = parts.activePart.split('').map(function(char) {
-                return activeChars.indexOf(char) === -1 ? 'p' : 'a';
-            }).join('');
-            if(charTypes.indexOf('p') !== -1) {
-                error = 'D3086';
-            }
-            if(decimalPos !== -1) {
-                if(subpicture.charAt(decimalPos - 1) === properties['grouping-separator'] || subpicture.charAt(decimalPos + 1) === properties['grouping-separator']) {
-                    error = 'D3087';
-                }
-            } else if(parts.integerPart.charAt(parts.integerPart.length - 1) === properties['grouping-separator']) {
-                error = 'D3088';
-            }
-            if(subpicture.indexOf(properties['grouping-separator'] + properties['grouping-separator']) !== -1) {
-                error = 'D3089';
-            }
-            var optionalDigitPos = parts.integerPart.indexOf(properties.digit);
-            if(optionalDigitPos !== -1 && parts.integerPart.substring(0, optionalDigitPos).split('').filter(function(char) {
-                return decimalDigitFamily.indexOf(char) > -1;
-            }).length > 0) {
-                error = 'D3090';
-            }
-            optionalDigitPos = parts.fractionalPart.lastIndexOf(properties.digit);
-            if(optionalDigitPos !== -1 && parts.fractionalPart.substring(optionalDigitPos).split('').filter(function(char) {
-                return decimalDigitFamily.indexOf(char) > -1;
-            }).length > 0) {
-                error = 'D3091';
-            }
-            var exponentExists = (typeof parts.exponentPart === 'string');
-            if(exponentExists && parts.exponentPart.length > 0 && (subpicture.indexOf(properties.percent) !== -1 || subpicture.indexOf(properties['per-mille']) !== -1)) {
-                error = 'D3092';
-            }
-            if(exponentExists && (parts.exponentPart.length === 0 || parts.exponentPart.split('').filter(function(char) {
-                return decimalDigitFamily.indexOf(char) === -1;
-            }).length > 0)) {
-                error = 'D3093';
-            }
-            if(error) {
-                throw {
-                    code: error,
-                    stack: (new Error()).stack
-                };
-            }
-        };
-
-        // analyse the picture string, F&O 4.7.4
-        var analyse = function(parts) {
-            var getGroupingPositions = function(part, toLeft) {
-                var positions = [];
-                var groupingPosition = part.indexOf(properties['grouping-separator']);
-                while(groupingPosition !== -1) {
-                    var charsToTheRight = (toLeft ? part.substring(0, groupingPosition) : part.substring(groupingPosition)).split('').filter(function(char) {
-                        return decimalDigitFamily.indexOf(char) !== -1 || char === properties.digit;
-                    }).length;
-                    positions.push(charsToTheRight);
-                    groupingPosition = parts.integerPart.indexOf(properties['grouping-separator'], groupingPosition + 1);
-                }
-                return positions;
-            };
-            var integerPartGroupingPositions = getGroupingPositions(parts.integerPart);
-            var regular = function(indexes) {
-                // are the grouping positions regular? i.e. same interval between each of them
-                if(indexes.length === 0) {
-                    return 0;
-                }
-                var gcd = function(a, b) {
-                    return b === 0 ? a : gcd(b, a % b);
-                };
-                // find the greatest common divisor of all the positions
-                var factor = indexes.reduce(gcd);
-                // is every position separated by this divisor? If so, it's regular
-                for(var index = 1; index <= indexes.length; index++) {
-                    if(indexes.indexOf(index * factor) === -1) {
-                        return 0;
-                    }
-                }
-                return factor;
-            };
-
-            var regularGrouping = regular(integerPartGroupingPositions);
-            var fractionalPartGroupingPositions = getGroupingPositions(parts.fractionalPart, true);
-
-            var minimumIntegerPartSize = parts.integerPart.split('').filter(function(char) { return decimalDigitFamily.indexOf(char) !== -1; }).length;
-            var scalingFactor = minimumIntegerPartSize;
-
-            var fractionalPartArray = parts.fractionalPart.split('');
-            var minimumFactionalPartSize = fractionalPartArray.filter(function(char) { return decimalDigitFamily.indexOf(char) !== -1; }).length;
-            var maximumFactionalPartSize = fractionalPartArray.filter(function(char) { return decimalDigitFamily.indexOf(char) !== -1 || char === properties.digit; }).length;
-            var exponentPresent = typeof parts.exponentPart === 'string';
-            if(minimumIntegerPartSize === 0 && maximumFactionalPartSize === 0) {
-                if(exponentPresent) {
-                    minimumFactionalPartSize = 1;
-                    maximumFactionalPartSize = 1;
-                } else {
-                    minimumIntegerPartSize = 1;
-                }
-            }
-            if(exponentPresent && minimumIntegerPartSize === 0 && parts.integerPart.indexOf(properties.digit) !== -1) {
-                minimumIntegerPartSize = 1;
-            }
-            if(minimumIntegerPartSize === 0 && minimumFactionalPartSize === 0) {
-                minimumFactionalPartSize = 1;
-            }
-            var minimumExponentSize = 0;
-            if(exponentPresent) {
-                minimumExponentSize = parts.exponentPart.split('').filter(function(char) { return decimalDigitFamily.indexOf(char) !== -1; }).length;
-            }
-
-            return {
-                integerPartGroupingPositions: integerPartGroupingPositions,
-                regularGrouping: regularGrouping,
-                minimumIntegerPartSize: minimumIntegerPartSize,
-                scalingFactor: scalingFactor,
-                prefix: parts.prefix,
-                fractionalPartGroupingPositions: fractionalPartGroupingPositions,
-                minimumFactionalPartSize: minimumFactionalPartSize,
-                maximumFactionalPartSize: maximumFactionalPartSize,
-                minimumExponentSize: minimumExponentSize,
-                suffix: parts.suffix,
-                picture: parts.subpicture
-            };
-        };
-
-        var parts = subPictures.map(splitParts);
-        parts.forEach(validate);
-
-        var variables = parts.map(analyse);
-
-        if(variables.length === 1) {
-            variables.push(JSON.parse(JSON.stringify(variables[0])));
-            variables[1].prefix = properties['minus-sign'] + variables[1].prefix;
-        }
-
-        // TODO cache the result of the analysis
-
-        // format the number
-        // bullet 1: TODO: NaN - not sure we'd ever get this in JSON
-        var pic;
-        // bullet 2:
-        if(value >= 0) {
-            pic = variables[0];
-        } else {
-            pic = variables[1];
-        }
-        var adjustedNumber;
-        // bullet 3:
-        if(pic.picture.indexOf(properties.percent) !== -1) {
-            adjustedNumber = value * 100;
-        } else if(pic.picture.indexOf(properties['per-mille']) !== -1) {
-            adjustedNumber = value * 1000;
-        } else {
-            adjustedNumber = value;
-        }
-        // bullet 4:
-        // TODO: infinity - not sure we'd ever get this in JSON
-        // bullet 5:
-        var mantissa, exponent;
-        if(pic.minimumExponentSize === 0) {
-            mantissa = adjustedNumber;
-        } else {
-            // mantissa * 10^exponent = adjustedNumber
-            var maxMantissa = Math.pow(10, pic.scalingFactor);
-            var minMantissa = Math.pow(10, pic.scalingFactor - 1);
-            mantissa = adjustedNumber;
-            exponent = 0;
-            while(mantissa < minMantissa) {
-                mantissa *= 10;
-                exponent -= 1;
-            }
-            while(mantissa > maxMantissa) {
-                mantissa /= 10;
-                exponent += 1;
-            }
-        }
-        // bullet 6:
-        var roundedNumber = functionRound(mantissa, pic.maximumFactionalPartSize);
-        // bullet 7:
-        var makeString = function(value, dp) {
-            var str = Math.abs(value).toFixed(dp);
-            if (properties['zero-digit'] !== '0') {
-                str = str.split('').map(function (digit) {
-                    if(digit >= '0' && digit <='9') {
-                        return decimalDigitFamily[digit.charCodeAt(0) - 48];
-                    } else {
-                        return digit;
-                    }
-                }).join('');
-            }
-            return str;
-        };
-        var stringValue = makeString(roundedNumber, pic.maximumFactionalPartSize);
-        var decimalPos = stringValue.indexOf('.');
-        if(decimalPos === -1) {
-            stringValue = stringValue + properties['decimal-separator'];
-        } else {
-            stringValue = stringValue.replace('.', properties['decimal-separator']);
-        }
-        while(stringValue.charAt(0) === properties['zero-digit']) {
-            stringValue = stringValue.substring(1);
-        }
-        while(stringValue.charAt(stringValue.length - 1) === properties['zero-digit']) {
-            stringValue = stringValue.substring(0, stringValue.length - 1);
-        }
-        // bullets 8 & 9:
-        decimalPos = stringValue.indexOf(properties['decimal-separator']);
-        var padLeft = pic.minimumIntegerPartSize - decimalPos;
-        var padRight = pic.minimumFactionalPartSize - (stringValue.length - decimalPos - 1);
-        stringValue = (padLeft > 0 ? new Array(padLeft + 1).join('0') : '') + stringValue;
-        stringValue = stringValue + (padRight > 0 ? new Array(padRight + 1).join('0') : '');
-        decimalPos = stringValue.indexOf(properties['decimal-separator']);
-        // bullet 10:
-        if(pic.regularGrouping > 0) {
-            var groupCount = Math.floor((decimalPos - 1) / pic.regularGrouping);
-            for(var group = 1; group <= groupCount; group++) {
-                stringValue = [stringValue.slice(0, decimalPos - group * pic.regularGrouping), properties['grouping-separator'], stringValue.slice(decimalPos - group * pic.regularGrouping)].join('');
-            }
-        } else {
-            pic.integerPartGroupingPositions.forEach(function (pos) {
-                stringValue = [stringValue.slice(0, decimalPos - pos), properties['grouping-separator'], stringValue.slice(decimalPos - pos)].join('');
-                decimalPos++;
-            });
-        }
-        // bullet 11:
-        decimalPos = stringValue.indexOf(properties['decimal-separator']);
-        pic.fractionalPartGroupingPositions.forEach(function(pos) {
-            stringValue = [stringValue.slice(0, pos + decimalPos + 1), properties['grouping-separator'], stringValue.slice(pos + decimalPos + 1)].join('');
-        });
-        // bullet 12:
-        decimalPos = stringValue.indexOf(properties['decimal-separator']);
-        if(pic.picture.indexOf(properties['decimal-separator']) === -1 || decimalPos === stringValue.length - 1) {
-            stringValue = stringValue.substring(0, stringValue.length - 1);
-        }
-        // bullet 13:
-        if(typeof exponent !== 'undefined') {
-            var stringExponent = makeString(exponent, 0);
-            padLeft = pic.minimumExponentSize - stringExponent.length;
-            if(padLeft > 0) {
-                stringExponent = new Array(padLeft + 1).join('0') + stringExponent;
-            }
-            stringValue = stringValue + properties['exponent-separator'] + (exponent < 0 ? properties['minus-sign'] : '') + stringExponent;
-        }
-        // bullet 14:
-        stringValue = pic.prefix + stringValue + pic.suffix;
-        return stringValue;
-    }
-
-    /**
-     * Converts a number to a string using a specified number base
-     * @param {string} value - the number to convert
-     * @param {number} [radix] - the number base; must be between 2 and 36. Defaults to 10
-     * @returns {string} - the converted string
-     */
-    function functionFormatBase(value, radix) {
-        // undefined inputs always return undefined
-        if(typeof value === 'undefined') {
-            return undefined;
-        }
-
-        value = functionRound(value);
-
-        if(typeof radix === 'undefined') {
-            radix = 10;
-        } else {
-            radix = functionRound(radix);
-        }
-
-        if(radix < 2 || radix > 36) {
-            throw {
-                code: 'D3100',
-                stack: (new Error()).stack,
-                value: radix
-            };
-
-        }
-
-        var result = value.toString(radix);
-
-        return result;
-    }
-
-    /**
-     * Cast argument to number
-     * @param {Object} arg - Argument
-     * @returns {Number} numeric value of argument
-     */
-    function functionNumber(arg) {
-        var result;
-
-        // undefined inputs always return undefined
-        if(typeof arg === 'undefined') {
-            return undefined;
-        }
-
-        if (typeof arg === 'number') {
-            // already a number
-            result = arg;
-        } else if(typeof arg === 'string' && /^-?(0|([1-9][0-9]*))(\.[0-9]+)?([Ee][-+]?[0-9]+)?$/.test(arg) && !isNaN(parseFloat(arg)) && isFinite(arg)) {
-            result = parseFloat(arg);
-        } else {
-            throw {
-                code: "D3030",
-                value: arg,
-                stack: (new Error()).stack,
-                index: 1
-            };
-        }
-        return result;
-    }
-
-    /**
-     * Absolute value of a number
-     * @param {Number} arg - Argument
-     * @returns {Number} absolute value of argument
-     */
-    function functionAbs(arg) {
-        var result;
-
-        // undefined inputs always return undefined
-        if(typeof arg === 'undefined') {
-            return undefined;
-        }
-
-        result = Math.abs(arg);
-        return result;
-    }
-
-    /**
-     * Rounds a number down to integer
-     * @param {Number} arg - Argument
-     * @returns {Number} rounded integer
-     */
-    function functionFloor(arg) {
-        var result;
-
-        // undefined inputs always return undefined
-        if(typeof arg === 'undefined') {
-            return undefined;
-        }
-
-        result = Math.floor(arg);
-        return result;
-    }
-
-    /**
-     * Rounds a number up to integer
-     * @param {Number} arg - Argument
-     * @returns {Number} rounded integer
-     */
-    function functionCeil(arg) {
-        var result;
-
-        // undefined inputs always return undefined
-        if(typeof arg === 'undefined') {
-            return undefined;
-        }
-
-        result = Math.ceil(arg);
-        return result;
-    }
-
-    /**
-     * Round to half even
-     * @param {Number} arg - Argument
-     * @param {Number} precision - number of decimal places
-     * @returns {Number} rounded integer
-     */
-    function functionRound(arg, precision) {
-        var result;
-
-        // undefined inputs always return undefined
-        if(typeof arg === 'undefined') {
-            return undefined;
-        }
-
-        if(precision) {
-            // shift the decimal place - this needs to be done in a string since multiplying
-            // by a power of ten can introduce floating point precision errors which mess up
-            // this rounding algorithm - See 'Decimal rounding' in
-            // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/round
-            // Shift
-            var value = arg.toString().split('e');
-            arg = +(value[0] + 'e' + (value[1] ? (+value[1] + precision) : precision));
-
-        }
-
-        // round up to nearest int
-        result = Math.round(arg);
-        var diff = result - arg;
-        if(Math.abs(diff) === 0.5 && Math.abs(result % 2) === 1) {
-            // rounded the wrong way - adjust to nearest even number
-            result = result - 1;
-        }
-        if(precision) {
-            // Shift back
-            value = result.toString().split('e');
-            /* istanbul ignore next */
-            result = +(value[0] + 'e' + (value[1] ? (+value[1] - precision) : -precision));
-        }
-        if(Object.is(result, -0)) { // ESLint rule 'no-compare-neg-zero' suggests this way
-            // JSON doesn't do -0
-            result = 0;
-        }
-        return result;
-    }
-
-    /**
-     * Square root of number
-     * @param {Number} arg - Argument
-     * @returns {Number} square root
-     */
-    function functionSqrt(arg) {
-        var result;
-
-        // undefined inputs always return undefined
-        if(typeof arg === 'undefined') {
-            return undefined;
-        }
-
-        if(arg < 0) {
-            throw {
-                stack: (new Error()).stack,
-                code: "D3060",
-                index: 1,
-                value: arg
-            };
-        }
-
-        result = Math.sqrt(arg);
-
-        return result;
-    }
-
-    /**
-     * Raises number to the power of the second number
-     * @param {Number} arg - the base
-     * @param {Number} exp - the exponent
-     * @returns {Number} rounded integer
-     */
-    function functionPower(arg, exp) {
-        var result;
-
-        // undefined inputs always return undefined
-        if(typeof arg === 'undefined') {
-            return undefined;
-        }
-
-        result = Math.pow(arg, exp);
-
-        if(!isFinite(result)) {
-            throw {
-                stack: (new Error()).stack,
-                code: "D3061",
-                index: 1,
-                value: arg,
-                exp: exp
-            };
-        }
-
-        return result;
-    }
-
-    /**
-     * Returns a random number 0 <= n < 1
-     * @returns {number} random number
-     */
-    function functionRandom() {
-        return Math.random();
-    }
-
-    /**
-     * Evaluate an input and return a boolean
-     * @param {*} arg - Arguments
-     * @returns {boolean} Boolean
-     */
-    function functionBoolean(arg) {
-        // cast arg to its effective boolean value
-        // boolean: unchanged
-        // string: zero-length -> false; otherwise -> true
-        // number: 0 -> false; otherwise -> true
-        // null -> false
-        // array: empty -> false; length > 1 -> true
-        // object: empty -> false; non-empty -> true
-        // function -> false
-
-        // undefined inputs always return undefined
-        if(typeof arg === 'undefined') {
-            return undefined;
-        }
-
-        var result = false;
-        if (Array.isArray(arg)) {
-            if (arg.length === 1) {
-                result = functionBoolean(arg[0]);
-            } else if (arg.length > 1) {
-                var trues = arg.filter(function(val) {return functionBoolean(val);});
-                result = trues.length > 0;
-            }
-        } else if (typeof arg === 'string') {
-            if (arg.length > 0) {
-                result = true;
-            }
-        } else if (isNumeric(arg)) {
-            if (arg !== 0) {
-                result = true;
-            }
-        } else if (arg !== null && typeof arg === 'object') {
-            if (Object.keys(arg).length > 0) {
-                // make sure it's not a lambda function
-                if (!(isLambda(arg) || arg._jsonata_function)) {
-                    result = true;
-                }
-            }
-        } else if (typeof arg === 'boolean' && arg === true) {
-            result = true;
-        }
-        return result;
-    }
-
-    /**
-     * returns the Boolean NOT of the arg
-     * @param {*} arg - argument
-     * @returns {boolean} - NOT arg
-     */
-    function functionNot(arg) {
-        return !functionBoolean(arg);
-    }
-
-    /**
-     * Create a map from an array of arguments
-     * @param {Array} [arr] - array to map over
-     * @param {Function} func - function to apply
-     * @returns {Array} Map array
-     */
-    function* functionMap(arr, func) {
-        // undefined inputs always return undefined
-        if(typeof arr === 'undefined') {
-            return undefined;
-        }
-
-        var result = createSequence();
-        // do the map - iterate over the arrays, and invoke func
-        for (var i = 0; i < arr.length; i++) {
-            var func_args = [arr[i]]; // the first arg (value) is required
-            // the other two are optional - only supply it if the function can take it
-            var length = typeof func === 'function' ? func.length :
-                func._jsonata_function === true ? func.implementation.length : func.arguments.length;
-            if(length >= 2) {
-                func_args.push(i);
-            }
-            if(length >= 3) {
-                func_args.push(arr);
-            }
-            // invoke func
-            var res = yield * apply(func, func_args, null);
-            if(typeof res !== 'undefined') {
-                result.push(res);
-            }
-        }
-
-        return result;
-    }
-
-    // This generator function does not have a yield(), presumably to make it
-    // consistent with other similar functions.
-    /**
-     * Create a map from an array of arguments
-     * @param {Array} [arr] - array to filter
-     * @param {Function} func - predicate function
-     * @returns {Array} Map array
-     */
-    function* functionFilter(arr, func) { // eslint-disable-line require-yield
-        // undefined inputs always return undefined
-        if(typeof arr === 'undefined') {
-            return undefined;
-        }
-
-        var result = createSequence();
-
-        var predicate = function (value, index, array) {
-            var it = apply(func, [value, index, array], null);
-            // returns a generator - so iterate over it
-            var res = it.next();
-            while (!res.done) {
-                res = it.next(res.value);
-            }
-            return res.value;
-        };
-
-        for(var i = 0; i < arr.length; i++) {
-            var entry = arr[i];
-            if(functionBoolean(predicate(entry, i, arr))) {
-                result.push(entry);
-            }
-        }
-
-        return result;
-    }
-
-    /**
-     * Convolves (zips) each value from a set of arrays
-     * @param {Array} [args] - arrays to zip
-     * @returns {Array} Zipped array
-     */
-    function functionZip() {
-        // this can take a variable number of arguments
-        var result = [];
-        var args = Array.prototype.slice.call(arguments);
-        // length of the shortest array
-        var length = Math.min.apply(Math, args.map(function(arg) {
-            if(Array.isArray(arg)) {
-                return arg.length;
-            }
-            return 0;
-        }));
-        for(var i = 0; i < length; i++) {
-            var tuple = args.map((arg) => {return arg[i];});
-            result.push(tuple);
-        }
-        return result;
-    }
-
-    /**
-     * Fold left function
-     * @param {Array} sequence - Sequence
-     * @param {Function} func - Function
-     * @param {Object} init - Initial value
-     * @returns {*} Result
-     */
-    function* functionFoldLeft(sequence, func, init) {
-        // undefined inputs always return undefined
-        if(typeof sequence === 'undefined') {
-            return undefined;
-        }
-
-        var result;
-
-        if (!(func.length === 2 || (func._jsonata_function === true && func.implementation.length === 2) || func.arguments.length === 2)) {
-            throw {
-                stack: (new Error()).stack,
-                code: "D3050",
-                index: 1
-            };
-        }
-
-        var index;
-        if (typeof init === 'undefined' && sequence.length > 0) {
-            result = sequence[0];
-            index = 1;
-        } else {
-            result = init;
-            index = 0;
-        }
-
-        while (index < sequence.length) {
-            result = yield * apply(func, [result, sequence[index]], null);
-            index++;
-        }
-
-        return result;
-    }
-
-    /**
-     * Return keys for an object
-     * @param {Object} arg - Object
-     * @returns {Array} Array of keys
-     */
-    function functionKeys(arg) {
-        var result = createSequence();
-
-        if(Array.isArray(arg)) {
-            // merge the keys of all of the items in the array
-            var merge = {};
-            arg.forEach(function(item) {
-                var keys = functionKeys(item);
-                if(Array.isArray(keys)) {
-                    keys.forEach(function(key) {
-                        merge[key] = true;
-                    });
-                }
-            });
-            result = functionKeys(merge);
-        } else if(arg !== null && typeof arg === 'object' && !(isLambda(arg))) {
-            result = Object.keys(arg);
-            if(result.length === 0) {
-                result = undefined;
-            }
-        } else {
-            result = undefined;
-        }
-        return result;
-    }
-
-    /**
-     * Return value from an object for a given key
-     * @param {Object} object - Object
-     * @param {String} key - Key in object
-     * @returns {*} Value of key in object
-     */
-    function functionLookup(object, key) {
-        var result = evaluateName({value: key}, object);
-        return result;
-    }
-
-    /**
-     * Append second argument to first
-     * @param {Array|Object} arg1 - First argument
-     * @param {Array|Object} arg2 - Second argument
-     * @returns {*} Appended arguments
-     */
-    function functionAppend(arg1, arg2) {
-        // disregard undefined args
-        if (typeof arg1 === 'undefined') {
-            return arg2;
-        }
-        if (typeof arg2 === 'undefined') {
-            return arg1;
-        }
-        // if either argument is not an array, make it so
-        if (!Array.isArray(arg1)) {
-            arg1 = createSequence(arg1);
-        }
-        if (!Array.isArray(arg2)) {
-            arg2 = [arg2];
-        }
-        Array.prototype.push.apply(arg1, arg2);
-        return arg1;
-    }
-
-    /**
-     * Determines if the argument is undefined
-     * @param {*} arg - argument
-     * @returns {boolean} False if argument undefined, otherwise true
-     */
-    function functionExists(arg){
-        if (typeof arg === 'undefined') {
-            return false;
-        } else {
-            return true;
-        }
-    }
-
-    /**
-     * Splits an object into an array of object with one property each
-     * @param {*} arg - the object to split
-     * @returns {*} - the array
-     */
-    function functionSpread(arg) {
-        var result = createSequence();
-
-        if(Array.isArray(arg)) {
-            // spread all of the items in the array
-            arg.forEach(function(item) {
-                result = functionAppend(result, functionSpread(item));
-            });
-        } else if(arg !== null && typeof arg === 'object' && !isLambda(arg)) {
-            for(var key in arg) {
-                var obj = {};
-                obj[key] = arg[key];
-                result.push(obj);
-            }
-        } else {
-            result = arg;
-        }
-        return result;
-    }
-
-    /**
-     * Merges an array of objects into a single object.  Duplicate properties are
-     * overridden by entries later in the array
-     * @param {*} arg - the objects to merge
-     * @returns {*} - the object
-     */
-    function functionMerge(arg) {
-        // undefined inputs always return undefined
-        if(typeof arg === 'undefined') {
-            return undefined;
-        }
-
-        var result = {};
-
-        arg.forEach(function(obj) {
-            for(var prop in obj) {
-                result[prop] = obj[prop];
-            }
-        });
-        return result;
-    }
-
-    /**
-     * Reverses the order of items in an array
-     * @param {Array} arr - the array to reverse
-     * @returns {Array} - the reversed array
-     */
-    function functionReverse(arr) {
-        // undefined inputs always return undefined
-        if(typeof arr === 'undefined') {
-            return undefined;
-        }
-
-        if(arr.length <= 1) {
-            return arr;
-        }
-
-        var length = arr.length;
-        var result = new Array(length);
-        for(var i = 0; i < length; i++) {
-            result[length - i - 1] = arr[i];
-        }
-
-        return result;
-    }
-
-    /**
-     *
-     * @param {*} obj - the input object to iterate over
-     * @param {*} func - the function to apply to each key/value pair
-     * @returns {Array} - the resultant array
-     */
-    function* functionEach(obj, func) {
-        var result = createSequence();
-
-        for(var key in obj) {
-            var func_args = [obj[key], key];
-            // invoke func
-            result.push(yield * apply(func, func_args, null));
-        }
-
-        return result;
-    }
-
-    /**
-     * Implements the merge sort (stable) with optional comparator function
-     *
-     * @param {Array} arr - the array to sort
-     * @param {*} comparator - comparator function
-     * @returns {Array} - sorted array
-     */
-    function functionSort(arr, comparator) {
-        // undefined inputs always return undefined
-        if(typeof arr === 'undefined') {
-            return undefined;
-        }
-
-        if(arr.length <= 1) {
-            return arr;
-        }
-
-        var comp;
-        if(typeof comparator === 'undefined') {
-            // inject a default comparator - only works for numeric or string arrays
-            if (!isArrayOfNumbers(arr) && !isArrayOfStrings(arr)) {
-                throw {
-                    stack: (new Error()).stack,
-                    code: "D3070",
-                    index: 1
-                };
-            }
-
-            comp = function (a, b) {
-                return a > b;
-            };
-        } else if(typeof comparator === 'function') {
-            // for internal usage of functionSort (i.e. order-by syntax)
-            comp = comparator;
-        } else {
-            comp = function (a, b) {
-                var it = apply(comparator, [a, b], null);
-                // returns a generator - so iterate over it
-                var comp = it.next();
-                while (!comp.done) {
-                    comp = it.next(comp.value);
-                }
-                return comp.value;
-            };
-        }
-
-        var merge = function(l, r) {
-            var merge_iter = function(result, left, right) {
-                if (left.length === 0) {
-                    Array.prototype.push.apply(result, right);
-                } else if (right.length === 0) {
-                    Array.prototype.push.apply(result, left);
-                } else if (comp(left[0], right[0])) { // invoke the comparator function
-                    // if it returns true - swap left and right
-                    result.push(right[0]);
-                    merge_iter(result, left, right.slice(1));
-                } else {
-                    // otherwise keep the same order
-                    result.push(left[0]);
-                    merge_iter(result, left.slice(1), right);
-                }
-            };
-            var merged = [];
-            merge_iter(merged, l, r);
-            return merged;
-        };
-
-        var sort = function(array) {
-            if(array.length <= 1) {
-                return array;
-            } else {
-                var middle = Math.floor(array.length / 2);
-                var left = array.slice(0, middle);
-                var right = array.slice(middle);
-                left = sort(left);
-                right = sort(right);
-                return merge(left, right);
-            }
-        };
-
-        var result = sort(arr);
-
-        return result;
-    }
-
-    /**
-     * Randomly shuffles the contents of an array
-     * @param {Array} arr - the input array
-     * @returns {Array} the shuffled array
-     */
-    function functionShuffle(arr) {
-        // undefined inputs always return undefined
-        if(typeof arr === 'undefined') {
-            return undefined;
-        }
-
-        if(arr.length <= 1) {
-            return arr;
-        }
-
-        // shuffle using the 'inside-out' variant of the Fisher-Yates algorithm
-        var result = new Array(arr.length);
-        for(var i = 0; i < arr.length; i++) {
-            var j = Math.floor(Math.random() * (i + 1)); // random integer such that 0 ≤ j ≤ i
-            if(i !== j) {
-                result[i] = result[j];
-            }
-            result[j] = arr[i];
-        }
-
-        return result;
-    }
-
-    /**
-     * Applies a predicate function to each key/value pair in an object, and returns an object containing
-     * only the key/value pairs that passed the predicate
-     *
-     * @param {object} arg - the object to be sifted
-     * @param {object} func - the predicate function (lambda or native)
-     * @returns {object} - sifted object
-     */
-    function functionSift(arg, func) {
-        var result = {};
-
-        var predicate = function (value, key, object) {
-            var it = apply(func, [value, key, object], null);
-            // returns a generator - so iterate over it
-            var res = it.next();
-            while (!res.done) {
-                res = it.next(res.value);
-            }
-            return res.value;
-        };
-
-        for(var item in arg) {
-            var entry = arg[item];
-            if(functionBoolean(predicate(entry, item, arg))) {
-                result[item] = entry;
-            }
-        }
-
-        // empty objects should be changed to undefined
-        if(Object.keys(result).length === 0) {
-            result = undefined;
-        }
-
-        return result;
-    }
-
-    // Regular expression to match an ISO 8601 formatted timestamp
-    var iso8601regex = new RegExp('^\\d{4}-[01]\\d-[0-3]\\dT[0-2]\\d:[0-5]\\d:[0-5]\\d\\.\\d+([+-][0-2]\\d:[0-5]\\d|Z)$');
-
-    /**
-     * Converts an ISO 8601 timestamp to milliseconds since the epoch
-     *
-     * @param {string} timestamp - the ISO 8601 timestamp to be converted
-     * @returns {Number} - milliseconds since the epoch
-     */
-    function functionToMillis(timestamp) {
-        // undefined inputs always return undefined
-        if(typeof timestamp === 'undefined') {
-            return undefined;
-        }
-
-        if(!iso8601regex.test(timestamp)) {
-            throw {
-                stack: (new Error()).stack,
-                code: "D3110",
-                value: timestamp
-            };
-        }
-
-        return Date.parse(timestamp);
-    }
-
-    /**
-     * Converts milliseconds since the epoch to an ISO 8601 timestamp
-     * @param {Number} millis - milliseconds since the epoch to be converted
-     * @returns {String} - an ISO 8601 formatted timestamp
-     */
-    function functionFromMillis(millis) {
-        // undefined inputs always return undefined
-        if(typeof millis === 'undefined') {
-            return undefined;
-        }
-
-        return new Date(millis).toISOString();
-    }
-
-    /**
-     * Clones an object
-     * @param {Object} arg - object to clone (deep copy)
-     * @returns {*} - the cloned object
-     */
-    function functionClone(arg) {
-        // undefined inputs always return undefined
-        if(typeof arg === 'undefined') {
-            return undefined;
-        }
-
-        return JSON.parse(functionString(arg));
-    }
-
-    /**
-     * Create frame
-     * @param {Object} enclosingEnvironment - Enclosing environment
-     * @returns {{bind: bind, lookup: lookup}} Created frame
-     */
-    function createFrame(enclosingEnvironment) {
-        var bindings = {};
-        return {
-            bind: function (name, value) {
-                bindings[name] = value;
-            },
-            lookup: function (name) {
-                var value;
-                if(bindings.hasOwnProperty(name)) {
-                    value = bindings[name];
-                } else if (enclosingEnvironment) {
-                    value = enclosingEnvironment.lookup(name);
-                }
-                return value;
-            }
-        };
-    }
-
-    // Function registration
-    staticFrame.bind('sum', defineFunction(functionSum, '<a<n>:n>'));
-    staticFrame.bind('count', defineFunction(functionCount, '<a:n>'));
-    staticFrame.bind('max', defineFunction(functionMax, '<a<n>:n>'));
-    staticFrame.bind('min', defineFunction(functionMin, '<a<n>:n>'));
-    staticFrame.bind('average', defineFunction(functionAverage, '<a<n>:n>'));
-    staticFrame.bind('string', defineFunction(functionString, '<x-:s>'));
-    staticFrame.bind('substring', defineFunction(functionSubstring, '<s-nn?:s>'));
-    staticFrame.bind('substringBefore', defineFunction(functionSubstringBefore, '<s-s:s>'));
-    staticFrame.bind('substringAfter', defineFunction(functionSubstringAfter, '<s-s:s>'));
-    staticFrame.bind('lowercase', defineFunction(functionLowercase, '<s-:s>'));
-    staticFrame.bind('uppercase', defineFunction(functionUppercase, '<s-:s>'));
-    staticFrame.bind('length', defineFunction(functionLength, '<s-:n>'));
-    staticFrame.bind('trim', defineFunction(functionTrim, '<s-:s>'));
-    staticFrame.bind('pad', defineFunction(functionPad, '<s-ns?:s>'));
-    staticFrame.bind('match', defineFunction(functionMatch, '<s-f<s:o>n?:a<o>>'));
-    staticFrame.bind('contains', defineFunction(functionContains, '<s-(sf):b>')); // TODO <s-(sf<s:o>):b>
-    staticFrame.bind('replace', defineFunction(functionReplace, '<s-(sf)(sf)n?:s>')); // TODO <s-(sf<s:o>)(sf<o:s>)n?:s>
-    staticFrame.bind('split', defineFunction(functionSplit, '<s-(sf)n?:a<s>>')); // TODO <s-(sf<s:o>)n?:a<s>>
-    staticFrame.bind('join', defineFunction(functionJoin, '<a<s>s?:s>'));
-    staticFrame.bind('formatNumber', defineFunction(functionFormatNumber, '<n-so?:s>'));
-    staticFrame.bind('formatBase', defineFunction(functionFormatBase, '<n-n?:s>'));
-    staticFrame.bind('number', defineFunction(functionNumber, '<(ns)-:n>'));
-    staticFrame.bind('floor', defineFunction(functionFloor, '<n-:n>'));
-    staticFrame.bind('ceil', defineFunction(functionCeil, '<n-:n>'));
-    staticFrame.bind('round', defineFunction(functionRound, '<n-n?:n>'));
-    staticFrame.bind('abs', defineFunction(functionAbs, '<n-:n>'));
-    staticFrame.bind('sqrt', defineFunction(functionSqrt, '<n-:n>'));
-    staticFrame.bind('power', defineFunction(functionPower, '<n-n:n>'));
-    staticFrame.bind('random', defineFunction(functionRandom, '<:n>'));
-    staticFrame.bind('boolean', defineFunction(functionBoolean, '<x-:b>'));
-    staticFrame.bind('not', defineFunction(functionNot, '<x-:b>'));
-    staticFrame.bind('map', defineFunction(functionMap, '<af>'));
-    staticFrame.bind('zip', defineFunction(functionZip, '<a+>'));
-    staticFrame.bind('filter', defineFunction(functionFilter, '<af>'));
-    staticFrame.bind('reduce', defineFunction(functionFoldLeft, '<afj?:j>')); // TODO <f<jj:j>a<j>j?:j>
-    staticFrame.bind('sift', defineFunction(functionSift, '<o-f?:o>'));
-    staticFrame.bind('keys', defineFunction(functionKeys, '<x-:a<s>>'));
-    staticFrame.bind('lookup', defineFunction(functionLookup, '<x-s:x>'));
-    staticFrame.bind('append', defineFunction(functionAppend, '<xx:a>'));
-    staticFrame.bind('exists', defineFunction(functionExists, '<x:b>'));
-    staticFrame.bind('spread', defineFunction(functionSpread, '<x-:a<o>>'));
-    staticFrame.bind('merge', defineFunction(functionMerge, '<a<o>:o>'));
-    staticFrame.bind('reverse', defineFunction(functionReverse, '<a:a>'));
-    staticFrame.bind('each', defineFunction(functionEach, '<o-f:a>'));
-    staticFrame.bind('sort', defineFunction(functionSort, '<af?:a>'));
-    staticFrame.bind('shuffle', defineFunction(functionShuffle, '<a:a>'));
-    staticFrame.bind('base64encode', defineFunction(functionBase64encode, '<s-:s>'));
-    staticFrame.bind('base64decode', defineFunction(functionBase64decode, '<s-:s>'));
-    staticFrame.bind('toMillis', defineFunction(functionToMillis, '<s-:n>'));
-    staticFrame.bind('fromMillis', defineFunction(functionFromMillis, '<n-:s>'));
-    staticFrame.bind('clone', defineFunction(functionClone, '<(oa)-:o>'));
-
-    /**
-     * Error codes
-     *
-     */
-    var errorCodes = {
-        "S0101": "String literal must be terminated by a matching quote",
-        "S0102": "Number out of range: {{token}}",
-        "S0103": "Unsupported escape sequence: \\{{token}}",
-        "S0104": "The escape sequence \\u must be followed by 4 hex digits",
-        "S0105": "Quoted property name must be terminated with a backquote (`)",
-        "S0201": "Syntax error: {{token}}",
-        "S0202": "Expected {{value}}, got {{token}}",
-        "S0203": "Expected {{value}} before end of expression",
-        "S0204": "Unknown operator: {{token}}",
-        "S0205": "Unexpected token: {{token}}",
-        "S0206": "Unknown expression type: {{token}}",
-        "S0207": "Unexpected end of expression",
-        "S0208": "Parameter {{value}} of function definition must be a variable name (start with $)",
-        "S0209": "A predicate cannot follow a grouping expression in a step",
-        "S0210": "Each step can only have one grouping expression",
-        "S0211": "The symbol {{token}} cannot be used as a unary operator",
-        "S0301": "Empty regular expressions are not allowed",
-        "S0302": "No terminating / in regular expression",
-        "S0402": "Choice groups containing parameterized types are not supported",
-        "S0401": "Type parameters can only be applied to functions and arrays",
-        "S0500": "Attempted to evaluate an expression containing syntax error(s)",
-        "T0410": "Argument {{index}} of function {{token}} does not match function signature",
-        "T0411": "Context value is not a compatible type with argument {{index}} of function {{token}}",
-        "T0412": "Argument {{index}} of function {{token}} must be an array of {{type}}",
-        "D1001": "Number out of range: {{value}}",
-        "D1002": "Cannot negate a non-numeric value: {{value}}",
-        "T1003": "Key in object structure must evaluate to a string; got: {{value}}",
-        "D1004": "Regular expression matches zero length string",
-        "T1005": "Attempted to invoke a non-function. Did you mean ${{{token}}}?",
-        "T1006": "Attempted to invoke a non-function",
-        "T1007": "Attempted to partially apply a non-function. Did you mean ${{{token}}}?",
-        "T1008": "Attempted to partially apply a non-function",
-        "T2001": "The left side of the {{token}} operator must evaluate to a number",
-        "T2002": "The right side of the {{token}} operator must evaluate to a number",
-        "T2003": "The left side of the range operator (..) must evaluate to an integer",
-        "T2004": "The right side of the range operator (..) must evaluate to an integer",
-        "D2005": "The left side of := must be a variable name (start with $)",
-        "T2006": "The right side of the function application operator ~> must be a function",
-        "T2007": "Type mismatch when comparing values {{value}} and {{value2}} in order-by clause",
-        "T2008": "The expressions within an order-by clause must evaluate to numeric or string values",
-        "T2009": "The values {{value}} and {{value2}} either side of operator {{token}} must be of the same data type",
-        "T2010": "The expressions either side of operator {{token}} must evaluate to numeric or string values",
-        "T2011": "The insert/update clause of the transform expression must evaluate to an object: {{value}}",
-        "T2012": "The delete clause of the transform expression must evaluate to a string or array of strings: {{value}}",
-        "T2013": "The transform expression clones the input object using the $clone() function.  This has been overridden in the current scope by a non-function.",
-        "D3001": "Attempting to invoke string function on Infinity or NaN",
-        "D3010": "Second argument of replace function cannot be an empty string",
-        "D3011": "Fourth argument of replace function must evaluate to a positive number",
-        "D3012": "Attempted to replace a matched string with a non-string value",
-        "D3020": "Third argument of split function must evaluate to a positive number",
-        "D3030": "Unable to cast value to a number: {{value}}",
-        "D3040": "Third argument of match function must evaluate to a positive number",
-        "D3050": "First argument of reduce function must be a function with two arguments",
-        "D3060": "The sqrt function cannot be applied to a negative number: {{value}}",
-        "D3061": "The power function has resulted in a value that cannot be represented as a JSON number: base={{value}}, exponent={{exp}}",
-        "D3070": "The single argument form of the sort function can only be applied to an array of strings or an array of numbers.  Use the second argument to specify a comparison function",
-        "D3080": "The picture string must only contain a maximum of two sub-pictures",
-        "D3081": "The sub-picture must not contain more than one instance of the 'decimal-separator' character",
-        "D3082": "The sub-picture must not contain more than one instance of the 'percent' character",
-        "D3083": "The sub-picture must not contain more than one instance of the 'per-mille' character",
-        "D3084": "The sub-picture must not contain both a 'percent' and a 'per-mille' character",
-        "D3085": "The mantissa part of a sub-picture must contain at least one character that is either an 'optional digit character' or a member of the 'decimal digit family'",
-        "D3086": "The sub-picture must not contain a passive character that is preceded by an active character and that is followed by another active character",
-        "D3087": "The sub-picture must not contain a 'grouping-separator' character that appears adjacent to a 'decimal-separator' character",
-        "D3088": "The sub-picture must not contain a 'grouping-separator' at the end of the integer part",
-        "D3089": "The sub-picture must not contain two adjacent instances of the 'grouping-separator' character",
-        "D3090": "The integer part of the sub-picture must not contain a member of the 'decimal digit family' that is followed by an instance of the 'optional digit character'",
-        "D3091": "The fractional part of the sub-picture must not contain an instance of the 'optional digit character' that is followed by a member of the 'decimal digit family'",
-        "D3092": "A sub-picture that contains a 'percent' or 'per-mille' character must not contain a character treated as an 'exponent-separator'",
-        "D3093": "The exponent part of the sub-picture must comprise only of one or more characters that are members of the 'decimal digit family'",
-        "D3100": "The radix of the formatBase function must be between 2 and 36.  It was given {{value}}",
-        "D3110": "The argument of the toMillis function must be an ISO 8601 formatted timestamp. Given {{value}}"
-    };
-
-    /**
-     * lookup a message template from the catalog and substitute the inserts
-     * @param {string} err - error code to lookup
-     * @returns {string} message
-     */
-    function lookupMessage(err) {
-        var message = 'Unknown error';
-        if(typeof err.message !== 'undefined') {
-            message = err.message;
-        }
-        var template = errorCodes[err.code];
-        if(typeof template !== 'undefined') {
-            // if there are any handlebars, replace them with the field references
-            // triple braces - replace with value
-            // double braces - replace with json stringified value
-            message = template.replace(/\{\{\{([^}]+)}}}/g, function() {
-                return err[arguments[1]];
-            });
-            message = message.replace(/\{\{([^}]+)}}/g, function() {
-                return JSON.stringify(err[arguments[1]]);
-            });
-        }
-        return message;
-    }
-
-    /**
-     * JSONata
-     * @param {Object} expr - JSONata expression
-     * @param {boolean} options - recover: attempt to recover on parse error
-     * @returns {{evaluate: evaluate, assign: assign}} Evaluated expression
-     */
-    function jsonata(expr, options) {
-        var ast;
-        var errors;
-        try {
-            ast = parser(expr, options && options.recover);
-            errors = ast.errors;
-            delete ast.errors;
-        } catch(err) {
-            // insert error message into structure
-            err.message = lookupMessage(err);
-            throw err;
-        }
-        var environment = createFrame(staticFrame);
-
-        var timestamp = new Date(); // will be overridden on each call to evalute()
-        environment.bind('now', defineFunction(function() {
-            return timestamp.toJSON();
-        }, '<:s>'));
-        environment.bind('millis', defineFunction(function() {
-            return timestamp.getTime();
-        }, '<:n>'));
-
-        return {
-            evaluate: function (input, bindings, callback) {
-                // throw if the expression compiled with syntax errors
-                if(typeof errors !== 'undefined') {
-                    var err = {
-                        code: 'S0500',
-                        position: 0
-                    };
-                    err.message = lookupMessage(err);
-                    throw err;
-                }
-
-                if (typeof bindings !== 'undefined') {
-                    var exec_env;
-                    // the variable bindings have been passed in - create a frame to hold these
-                    exec_env = createFrame(environment);
-                    for (var v in bindings) {
-                        exec_env.bind(v, bindings[v]);
-                    }
-                } else {
-                    exec_env = environment;
-                }
-                // put the input document into the environment as the root object
-                exec_env.bind('$', input);
-
-                // capture the timestamp and put it in the execution environment
-                // the $now() and $millis() functions will return this value - whenever it is called
-                timestamp = new Date();
-
-                var result, it;
-                // if a callback function is supplied, then drive the generator in a promise chain
-                if(typeof callback === 'function') {
-                    exec_env.bind('__jsonata_async', true);
-                    var thenHandler = function (response) {
-                        result = it.next(response);
-                        if (result.done) {
-                            callback(null, result.value);
-                        } else {
-                            result.value.then(thenHandler)
-                                .catch(function (err) {
-                                    err.message = lookupMessage(err);
-                                    callback(err, null);
-                                });
-                        }
-                    };
-                    it = evaluate(ast, input, exec_env);
-                    result = it.next();
-                    result.value.then(thenHandler);
-                } else {
-                    // no callback function - drive the generator to completion synchronously
-                    try {
-                        it = evaluate(ast, input, exec_env);
-                        result = it.next();
-                        while (!result.done) {
-                            result = it.next(result.value);
-                        }
-                        return result.value;
-                    } catch (err) {
-                        // insert error message into structure
-                        err.message = lookupMessage(err);
-                        throw err;
-                    }
-                }
-            },
-            assign: function (name, value) {
-                environment.bind(name, value);
-            },
-            registerFunction: function(name, implementation, signature) {
-                var func = defineFunction(implementation, signature);
-                environment.bind(name, func);
-            },
-            ast: function() {
-                return ast;
-            },
-            errors: function() {
-                return errors;
-            }
-        };
-    }
-
-    jsonata.parser = parser; // TODO remove this in a future release - use ast() instead
-
-    return jsonata;
-
-})();
-
-// node.js only - export the jsonata and parser functions
-// istanbul ignore else
-if(typeof module !== 'undefined') {
-    module.exports = jsonata;
-}
diff --git a/package-lock.json b/package-lock.json
deleted file mode 100644
index 87a5bf1f..00000000
--- a/package-lock.json
+++ /dev/null
@@ -1,5441 +0,0 @@
-{
-  "name": "jsonata",
-  "version": "1.3.3",
-  "lockfileVersion": 1,
-  "requires": true,
-  "dependencies": {
-    "JSONStream": {
-      "version": "1.3.1",
-      "resolved": "https://registry.npmjs.org/JSONStream/-/JSONStream-1.3.1.tgz",
-      "integrity": "sha1-cH92HgHa6eFvG8+TcDt4xwlmV5o=",
-      "dev": true,
-      "requires": {
-        "jsonparse": "1.3.1",
-        "through": "2.3.8"
-      }
-    },
-    "abbrev": {
-      "version": "1.0.9",
-      "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.0.9.tgz",
-      "integrity": "sha1-kbR5JYinc4wl813W9jdSovh3YTU=",
-      "dev": true
-    },
-    "acorn": {
-      "version": "4.0.13",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-4.0.13.tgz",
-      "integrity": "sha1-EFSVrlNh1pe9GVyCUZLhrX8lN4c=",
-      "dev": true
-    },
-    "acorn-jsx": {
-      "version": "3.0.1",
-      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-3.0.1.tgz",
-      "integrity": "sha1-r9+UiPsezvyDSPb7IvRk4ypYs2s=",
-      "dev": true,
-      "requires": {
-        "acorn": "3.3.0"
-      },
-      "dependencies": {
-        "acorn": {
-          "version": "3.3.0",
-          "resolved": "https://registry.npmjs.org/acorn/-/acorn-3.3.0.tgz",
-          "integrity": "sha1-ReN/s56No/JbruP/U2niu18iAXo=",
-          "dev": true
-        }
-      }
-    },
-    "ajv": {
-      "version": "4.11.8",
-      "resolved": "https://registry.npmjs.org/ajv/-/ajv-4.11.8.tgz",
-      "integrity": "sha1-gv+wKynmYq5TvcIK8VlHcGc5xTY=",
-      "dev": true,
-      "requires": {
-        "co": "4.6.0",
-        "json-stable-stringify": "1.0.1"
-      },
-      "dependencies": {
-        "json-stable-stringify": {
-          "version": "1.0.1",
-          "resolved": "https://registry.npmjs.org/json-stable-stringify/-/json-stable-stringify-1.0.1.tgz",
-          "integrity": "sha1-mnWdOcXy/1A/1TAGRu1EX4jE+a8=",
-          "dev": true,
-          "requires": {
-            "jsonify": "0.0.0"
-          }
-        }
-      }
-    },
-    "ajv-keywords": {
-      "version": "1.5.1",
-      "resolved": "https://registry.npmjs.org/ajv-keywords/-/ajv-keywords-1.5.1.tgz",
-      "integrity": "sha1-MU3QpLM2j609/NxU7eYXG4htrzw=",
-      "dev": true
-    },
-    "align-text": {
-      "version": "0.1.4",
-      "resolved": "https://registry.npmjs.org/align-text/-/align-text-0.1.4.tgz",
-      "integrity": "sha1-DNkKVhCT810KmSVsIrcGlDP60Rc=",
-      "dev": true,
-      "requires": {
-        "kind-of": "3.2.2",
-        "longest": "1.0.1",
-        "repeat-string": "1.6.1"
-      }
-    },
-    "amdefine": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/amdefine/-/amdefine-1.0.1.tgz",
-      "integrity": "sha1-SlKCrBZHKek2Gbz9OtFR+BfOkfU=",
-      "dev": true
-    },
-    "ansi-escapes": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-2.0.0.tgz",
-      "integrity": "sha1-W65SvkJIeN2Xg+iRDj/Cki6DyBs=",
-      "dev": true
-    },
-    "ansi-regex": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
-      "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
-      "dev": true
-    },
-    "ansi-styles": {
-      "version": "2.2.1",
-      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz",
-      "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=",
-      "dev": true
-    },
-    "anymatch": {
-      "version": "1.3.0",
-      "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-1.3.0.tgz",
-      "integrity": "sha1-o+Uvo5FoyCX/V7AkgSbOWo/5VQc=",
-      "dev": true,
-      "optional": true,
-      "requires": {
-        "arrify": "1.0.1",
-        "micromatch": "2.3.11"
-      }
-    },
-    "argparse": {
-      "version": "1.0.9",
-      "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.9.tgz",
-      "integrity": "sha1-c9g7wmP4bpf4zE9rrhsOkKfSLIY=",
-      "dev": true,
-      "requires": {
-        "sprintf-js": "1.0.3"
-      }
-    },
-    "arr-diff": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/arr-diff/-/arr-diff-2.0.0.tgz",
-      "integrity": "sha1-jzuCf5Vai9ZpaX5KQlasPOrjVs8=",
-      "dev": true,
-      "optional": true,
-      "requires": {
-        "arr-flatten": "1.0.3"
-      }
-    },
-    "arr-flatten": {
-      "version": "1.0.3",
-      "resolved": "https://registry.npmjs.org/arr-flatten/-/arr-flatten-1.0.3.tgz",
-      "integrity": "sha1-onTthawIhJtr14R8RYB0XcUa37E=",
-      "dev": true,
-      "optional": true
-    },
-    "array-filter": {
-      "version": "0.0.1",
-      "resolved": "https://registry.npmjs.org/array-filter/-/array-filter-0.0.1.tgz",
-      "integrity": "sha1-fajPLiZijtcygDWB/SH2fKzS7uw=",
-      "dev": true
-    },
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diff --git a/package.json b/package.json
index 021f72e3..5cc69e70 100644
--- a/package.json
+++ b/package.json
@@ -2,26 +2,28 @@
   "name": "jsonata",
   "version": "1.5.0",
   "description": "JSON query and transformation language",
-  "module": "jsonata.js",
-  "main": "jsonata-es5.js",
-  "typings": "jsonata.d.ts",
+  "module": "es2015/jsonata.js",
+  "main": "es5/jsonata.js",
+  "typings": "lib/jsonata.d.ts",
   "homepage": "http://jsonata.org/",
   "repository": {
     "type": "git",
     "url": "https://github.com/jsonata-js/jsonata.git"
   },
   "scripts": {
-    "pretest": "npm run lint",
     "mocha": "node ./node_modules/istanbul/lib/cli.js cover --report cobertura --report html ./node_modules/mocha/bin/_mocha -- \"test/**/*.js\"",
-    "test": "npm run mocha",
-    "posttest": "npm run check-coverage && npm run minify && npm run babel && npm run browserify && npm run minify-es5",
+    "jest": "jest",
+    "test": "npm run jest --coverage",
+    "posttest": "npm run check-coverage",
     "check-coverage": "istanbul check-coverage -statement 100 -branch 100 -function 100 -line 100",
-    "minify": "uglifyjs jsonata.js -o jsonata.min.js --compress --mangle",
-    "lint": "eslint .",
+    "minify": "uglifyjs dist/jsonata-browser.js -o dist/jsonata.min.js --compress --mangle",
+    "compile-es2015": "tsc -p tsconfig-es2015.json",
+    "compile-es5": "tsc -p tsconfig-es5.json",
+    "compile": "npm run compile-es2015 && npm run compile-es5",
     "doc": "jsdoc --configure jsdoc.json .",
-    "cover": "istanbul cover _mocha",
-    "coveralls": "npm run cover -- --report lcovonly && cat ./coverage/lcov.info | coveralls",
-    "babel": "node ./node_modules/babel-cli/bin/babel.js --out-file jsonata-es5.js jsonata.js",
+    "cover": "jest --coverage",
+    "bundle": "npm run compile && npm run jest --coverage && npm run check-coverage && rollup -c",
+    "coveralls": "cat ./coverage/lcov.info | coveralls",
     "browserify": "node ./node_modules/browserify/bin/cmd.js jsonata-es5.js --outfile jsonata-es5.js --standalone jsonata",
     "minify-es5": "uglifyjs jsonata-es5.js -o jsonata-es5.min.js --compress --mangle"
   },
@@ -35,10 +37,7 @@
     "path"
   ],
   "devDependencies": {
-    "babel-cli": "^6.24.1",
-    "babel-plugin-transform-runtime": "^6.23.0",
-    "babel-preset-env": "^1.5.2",
-    "babel-runtime": "^6.23.0",
+    "@types/jest": "^22.0.1",
     "browserify": "^15.2.0",
     "chai": "^4.1.2",
     "chai-as-promised": "^7.1.1",
@@ -46,13 +45,48 @@
     "eslint": "^4.0.0",
     "eslint-plugin-ideal": "^0.1.3",
     "istanbul": "^0.4.5",
+    "jest": "21.2.1",
     "jsdoc": "^3.4.0",
     "mocha": "^5.0.0",
     "mocha-lcov-reporter": "^1.2.0",
     "request": "^2.81.0",
-    "uglify-es": "^3.0.20"
+    "rollup": "^0.54.1",
+    "ts-jest": "21.2.3",
+    "uglify-es": "^3.0.20",
+    "@types/node": "^9.3.0",
+    "typescript": "^2.6.2"
   },
   "engines": {
     "node": ">= 4"
+  },
+  "jest": {
+    "globals": {
+      "ts-jest": {
+        "skipBabel": true
+      }
+    },
+    "coverageReporters": [
+      "json",
+      "lcov",
+      "text"
+    ],
+    "transform": {
+      "^.+\\.tsx?$": "ts-jest"
+    },
+    "collectCoverage": true,
+    "mapCoverage": true,
+    "testRegex": "/__tests__/.*\\.(ts|tsx)$",
+    "testPathIgnorePatterns": [
+      "/node_modules/",
+      "/lib/"
+    ],
+    "moduleFileExtensions": [
+      "ts",
+      "tsx",
+      "js",
+      "jsx",
+      "json",
+      "node"
+    ]
   }
 }
diff --git a/rollup.config.js b/rollup.config.js
new file mode 100644
index 00000000..518c49f1
--- /dev/null
+++ b/rollup.config.js
@@ -0,0 +1,25 @@
+/**
+ * © Copyright IBM Corp. 2016, 2017 All Rights Reserved
+ *   Project name: JSONata
+ *   This project is licensed under the MIT License, see LICENSE
+ */
+
+export default [
+    // This will convert the ES2015 modules (but not other ES2015 features) to CommonJS modules
+    {
+        input: "es2015/jsonata.js",
+        output: {
+            format: "cjs",
+            file: "dist/jsonata-cjs.js",
+        },
+    },
+    // This will convert the ES2015 modules (but not other ES2015 features) to a Universal Module Definition
+    {
+        input: "es2015/jsonata.js",
+        output: {
+            format: "iife",
+            file: "dist/jsonata-browser.js",
+            name: "jsonata",
+        },
+    },
+];
diff --git a/src/ast.ts b/src/ast.ts
new file mode 100644
index 00000000..70854bb8
--- /dev/null
+++ b/src/ast.ts
@@ -0,0 +1,206 @@
+import { Token } from "./tokenizer";
+import { Signature } from './signatures';
+
+// Potential AST changes
+//
+//   - Make predicate and group into AST nodes instead of optional fields on every node.
+//   - Change unary operator "[" to a different type...?
+//   - Get errors? off of BaseNode
+//   - Rationalize unary nodes
+
+export interface BaseNode {
+    type: string;
+    value: any;
+    position: number;
+    // This gets added to nodes to indicate how a value (assuming it is an object)
+    // should be grouped.
+    // TODO: Rename lhs...?
+    group?: { lhs: ASTNode[][], position: number };
+    // This gets added to nodes to specify a list of predicates to filter on.
+    predicate?: ASTNode[];
+}
+
+export interface WildcardNode extends BaseNode {
+    type: "wildcard";
+}
+
+export interface DescendantNode extends BaseNode {
+    type: "descendant";
+}
+
+export interface ErrorFields {
+    code: string;
+    position?: number;
+    token?: string;
+    stack?: string;
+}
+
+export interface ErrorNode extends BaseNode {
+    type: "error";
+    error: ErrorFields;
+    lhs: ASTNode;
+    remaining: Token[];
+}
+
+export interface VariableNode extends BaseNode {
+    type: "variable";
+}
+
+export interface NameNode extends BaseNode {
+    type: "name";
+}
+export interface LiteralNode extends BaseNode {
+    type: "literal";
+}
+
+export interface RegexNode extends BaseNode {
+    type: "regex";
+}
+
+export interface OperatorNode extends BaseNode {
+    type: "operator";
+}
+
+export interface EndNode extends BaseNode {
+    type: "end";
+    value: string;
+}
+
+export type TerminalNode = VariableNode | NameNode | LiteralNode | RegexNode | OperatorNode | EndNode;
+
+export interface UnaryMinusNode extends BaseNode {
+    type: "unary";
+    value: "-";
+    expression: ASTNode;
+}
+
+export interface ArrayConstructorNode extends BaseNode {
+    type: "unary";
+    value: "[";
+    expressions: ASTNode[];
+    consarray: boolean;
+}
+
+export interface UnaryObjectNode extends BaseNode {
+    type: "unary";
+    value: "{";
+    lhs: ASTNode[][];
+}
+
+export type UnaryNode = UnaryMinusNode | ArrayConstructorNode | UnaryObjectNode;
+
+export interface BinaryOperationNode extends BaseNode {
+    type: "binary";
+    value: "+" | "-" | "*" | "/" | "[" | ".." | "." | "[" | ":=" | "~>"; // TODO: There must be more?!? (e.g., comparisons)
+    lhs: ASTNode;
+    rhs: ASTNode; // ASTNode if operator is "." | "[" | ":=" | "~>"
+}
+
+export interface BinaryObjectNode extends BaseNode {
+    type: "binary";
+    value: "{";
+    lhs: ASTNode;
+    rhs: ASTNode[]; // ASTNode[] if operator is "{"
+}
+
+export type BinaryNode = BinaryOperationNode | BinaryObjectNode;
+
+export interface SortTerm {
+    descending: boolean;
+    expression: ASTNode;
+}
+
+export interface SortNode extends BaseNode {
+    type: "sort";
+    lhs: ASTNode;
+    rhs: SortTerm[];
+}
+
+export interface TernaryNode extends BaseNode {
+    type: "condition";
+    condition: ASTNode;
+    then: ASTNode;
+    else: ASTNode;
+    position: number;
+}
+
+export interface BlockNode extends BaseNode {
+    type: "block";
+    expressions: ASTNode[];
+}
+
+export interface TransformNode extends BaseNode {
+    type: "transform";
+    pattern: ASTNode;
+    update: ASTNode;
+    delete?: ASTNode;
+}
+
+export interface FunctionInvocationNode extends BaseNode {
+    type: "function" | "partial";
+    procedure: ASTNode;
+    arguments: ASTNode[];
+    // This is added when creating PathNodes.
+    nextFunction?: Function;
+}
+
+export interface LambdaDefinitionNode extends BaseNode {
+    type: "lambda";
+    body: ASTNode;
+    signature: Signature;
+    arguments: ASTNode[];
+    thunk: boolean;
+}
+
+export interface SingletonArrayDecorator extends BaseNode {
+    type: "singleton";
+    next: ASTNode;
+}
+
+// This type of node only appears after the AST is optimized
+export interface PathNode extends BaseNode {
+    type: "path";
+    steps: ASTNode[];
+    keepSingletonArray: boolean,
+}
+
+export interface BindNode extends BaseNode {
+    type: "bind";
+    lhs: ASTNode;
+    rhs: ASTNode;
+}
+
+export interface ApplyNode extends BaseNode {
+    type: "apply";
+    lhs: ASTNode;
+    rhs: ASTNode;
+}
+
+/**
+ * These are the AST nodes that come directly out of the parser before
+ * ast_optimize is called.
+ */
+export type ASTNode =
+    | WildcardNode
+    | DescendantNode
+    | ErrorNode
+    | LiteralNode
+    | NameNode
+    | VariableNode
+    | RegexNode
+    | OperatorNode
+    | UnaryNode
+    | BinaryNode
+    | BinaryObjectNode
+    | SortNode
+    | TernaryNode
+    | BlockNode
+    | TransformNode
+    | FunctionInvocationNode
+    | LambdaDefinitionNode
+    | PathNode
+    | BindNode
+    | ApplyNode
+    | EndNode
+    | SingletonArrayDecorator;
+
diff --git a/src/constants.ts b/src/constants.ts
new file mode 100644
index 00000000..2a2a0007
--- /dev/null
+++ b/src/constants.ts
@@ -0,0 +1,139 @@
+export const operators = {
+    ".": 75,
+    "[": 80,
+    "]": 0,
+    "{": 70,
+    "}": 0,
+    "(": 80,
+    ")": 0,
+    ",": 0,
+    "@": 75,
+    "#": 70,
+    ";": 80,
+    ":": 80,
+    "?": 20,
+    "+": 50,
+    "-": 50,
+    "*": 60,
+    "/": 60,
+    "%": 60,
+    "|": 20,
+    "=": 40,
+    "<": 40,
+    ">": 40,
+    "^": 40,
+    "**": 60,
+    "..": 20,
+    ":=": 10,
+    "!=": 40,
+    "<=": 40,
+    ">=": 40,
+    "~>": 40,
+    and: 30,
+    or: 25,
+    in: 40,
+    "&": 50,
+    "!": 0, // not an operator, but needed as a stop character for name tokens
+    "~": 0, // not an operator, but needed as a stop character for name tokens
+};
+
+export const escapes = {
+    // JSON string escape sequences - see json.org
+    '"': '"',
+    "\\": "\\",
+    "/": "/",
+    b: "\b",
+    f: "\f",
+    n: "\n",
+    r: "\r",
+    t: "\t",
+};
+
+/**
+ * Error codes
+ *
+ */
+export const errorCodes = {
+    S0101: "String literal must be terminated by a matching quote",
+    S0102: "Number out of range: {{token}}",
+    S0103: "Unsupported escape sequence: \\{{token}}",
+    S0104: "The escape sequence \\u must be followed by 4 hex digits",
+    S0105: "Quoted property name must be terminated with a backquote (`)",
+    S0201: "Syntax error: {{token}}",
+    S0202: "Expected {{value}}, got {{token}}",
+    S0203: "Expected {{value}} before end of expression",
+    S0204: "Unknown operator: {{token}}",
+    S0205: "Unexpected token: {{token}}",
+    S0206: "Unknown expression type: {{token}}",
+    S0207: "Unexpected end of expression",
+    S0208: "Parameter {{value}} of function definition must be a variable name (start with $)",
+    S0209: "A predicate cannot follow a grouping expression in a step",
+    S0210: "Each step can only have one grouping expression",
+    S0211: "The symbol {{token}} cannot be used as a unary operator",
+    S0301: "Empty regular expressions are not allowed",
+    S0302: "No terminating / in regular expression",
+    S0402: "Choice groups containing parameterized types are not supported",
+    S0401: "Type parameters can only be applied to functions and arrays",
+    S0500: "Attempted to evaluate an expression containing syntax error(s)",
+    T0410: "Argument {{index}} of function {{token}} does not match function signature",
+    T0411: "Context value is not a compatible type with argument {{index}} of function {{token}}",
+    T0412: "Argument {{index}} of function {{token}} must be an array of {{type}}",
+    D1001: "Number out of range: {{value}}",
+    D1002: "Cannot negate a non-numeric value: {{value}}",
+    T1003: "Key in object structure must evaluate to a string; got: {{value}}",
+    D1004: "Regular expression matches zero length string",
+    T1005: "Attempted to invoke a non-function. Did you mean ${{{token}}}?",
+    T1006: "Attempted to invoke a non-function",
+    T1007: "Attempted to partially apply a non-function. Did you mean ${{{token}}}?",
+    T1008: "Attempted to partially apply a non-function",
+    T2001: "The left side of the {{token}} operator must evaluate to a number",
+    T2002: "The right side of the {{token}} operator must evaluate to a number",
+    T2003: "The left side of the range operator (..) must evaluate to an integer",
+    T2004: "The right side of the range operator (..) must evaluate to an integer",
+    D2005: "The left side of := must be a variable name (start with $)",
+    T2006: "The right side of the function application operator ~> must be a function",
+    T2007: "Type mismatch when comparing values {{value}} and {{value2}} in order-by clause",
+    T2008: "The expressions within an order-by clause must evaluate to numeric or string values",
+    T2009: "The values {{value}} and {{value2}} either side of operator {{token}} must be of the same data type",
+    T2010: "The expressions either side of operator {{token}} must evaluate to numeric or string values",
+    T2011: "The insert/update clause of the transform expression must evaluate to an object: {{value}}",
+    T2012: "The delete clause of the transform expression must evaluate to a string or array of strings: {{value}}",
+    T2013:
+        "The transform expression clones the input object using the $clone() function.  This has been overridden in the current scope by a non-function.",
+    D3001: "Attempting to invoke string function on Infinity or NaN",
+    D3010: "Second argument of replace function cannot be an empty string",
+    D3011: "Fourth argument of replace function must evaluate to a positive number",
+    D3012: "Attempted to replace a matched string with a non-string value",
+    D3020: "Third argument of split function must evaluate to a positive number",
+    D3030: "Unable to cast value to a number: {{value}}",
+    D3040: "Third argument of match function must evaluate to a positive number",
+    D3050: "First argument of reduce function must be a function with two arguments",
+    D3060: "The sqrt function cannot be applied to a negative number: {{value}}",
+    D3061:
+        "The power function has resulted in a value that cannot be represented as a JSON number: base={{value}}, exponent={{exp}}",
+    D3070:
+        "The single argument form of the sort function can only be applied to an array of strings or an array of numbers.  Use the second argument to specify a comparison function",
+    D3080: "The picture string must only contain a maximum of two sub-pictures",
+    D3081: "The sub-picture must not contain more than one instance of the 'decimal-separator' character",
+    D3082: "The sub-picture must not contain more than one instance of the 'percent' character",
+    D3083: "The sub-picture must not contain more than one instance of the 'per-mille' character",
+    D3084: "The sub-picture must not contain both a 'percent' and a 'per-mille' character",
+    D3085:
+        "The mantissa part of a sub-picture must contain at least one character that is either an 'optional digit character' or a member of the 'decimal digit family'",
+    D3086:
+        "The sub-picture must not contain a passive character that is preceded by an active character and that is followed by another active character",
+    D3087:
+        "The sub-picture must not contain a 'grouping-separator' character that appears adjacent to a 'decimal-separator' character",
+    D3088: "The sub-picture must not contain a 'grouping-separator' at the end of the integer part",
+    D3089: "The sub-picture must not contain two adjacent instances of the 'grouping-separator' character",
+    D3090:
+        "The integer part of the sub-picture must not contain a member of the 'decimal digit family' that is followed by an instance of the 'optional digit character'",
+    D3091:
+        "The fractional part of the sub-picture must not contain an instance of the 'optional digit character' that is followed by a member of the 'decimal digit family'",
+    D3092:
+        "A sub-picture that contains a 'percent' or 'per-mille' character must not contain a character treated as an 'exponent-separator'",
+    D3093:
+        "The exponent part of the sub-picture must comprise only of one or more characters that are members of the 'decimal digit family'",
+    D3100: "The radix of the formatBase function must be between 2 and 36.  It was given {{value}}",
+    D3110: "The argument of the toMillis function must be an ISO 8601 formatted timestamp. Given {{value}}",
+};
diff --git a/src/evaluate.ts b/src/evaluate.ts
new file mode 100644
index 00000000..5834bb3f
--- /dev/null
+++ b/src/evaluate.ts
@@ -0,0 +1,1448 @@
+import {
+    isNumeric,
+    isArrayOfNumbers,
+    flatten,
+    createFrame,
+    isFunction,
+    isGenerator,
+    isLambda,
+    isArrayOfStrings,
+    createSequence,
+    toSequence,
+} from "./utils";
+import { defineFunction } from "./signatures";
+import { parser } from './parser';
+import { functionBoolean, functionAppend, functionString, functionSort, createStandardFrame } from "./functions";
+// import * as ast from "./ast";
+
+/**
+ * Evaluate expression against input data
+ * @param {Object} expr - JSONata expression
+ * @param {Object} input - Input data to evaluate against
+ * @param {Object} environment - Environment
+ * @returns {*} Evaluated input data
+ */
+export function* evaluate(expr, input, environment) {
+    var result;
+
+    var entryCallback = environment.lookup("__evaluate_entry");
+    if (entryCallback) {
+        entryCallback(expr, input, environment);
+    }
+
+    switch (expr.type) {
+        case "path":
+            result = yield* evaluatePath(expr, input, environment);
+            break;
+        case "binary":
+            result = yield* evaluateBinary(expr, input, environment);
+            break;
+        case "unary":
+            result = yield* evaluateUnary(expr, input, environment);
+            break;
+        case "name":
+            result = evaluateName(expr, input, environment);
+            break;
+        case "literal":
+            result = evaluateLiteral(expr, input, environment);
+            break;
+        case "wildcard":
+            result = evaluateWildcard(expr, input, environment);
+            break;
+        case "descendant":
+            result = evaluateDescendants(expr, input, environment);
+            break;
+        case "condition":
+            result = yield* evaluateCondition(expr, input, environment);
+            break;
+        case "block":
+            result = yield* evaluateBlock(expr, input, environment);
+            break;
+        case "bind":
+            result = yield* evaluateBindExpression(expr, input, environment);
+            break;
+        case "regex":
+            result = evaluateRegex(expr, input, environment);
+            break;
+        case "function":
+            result = yield* evaluateFunction(expr, input, environment);
+            break;
+        case "variable":
+            result = evaluateVariable(expr, input, environment);
+            break;
+        case "lambda":
+            result = evaluateLambda(expr, input, environment);
+            break;
+        case "partial":
+            result = yield* evaluatePartialApplication(expr, input, environment);
+            break;
+        case "apply":
+            result = yield* evaluateApplyExpression(expr, input, environment);
+            break;
+        case "sort":
+            result = yield* evaluateSortExpression(expr, input, environment);
+            break;
+        case "transform":
+            result = evaluateTransformExpression(expr, input, environment);
+            break;
+    }
+
+    if (
+        environment.lookup("__jsonata_async") &&
+        (typeof result === "undefined" || result === null || typeof result.then !== "function")
+    ) {
+        result = Promise.resolve(result);
+    }
+    if (
+        environment.lookup("__jsonata_async") &&
+        typeof result.then === "function" &&
+        expr.nextFunction &&
+        typeof result[expr.nextFunction] === "function"
+    ) {
+        // although this is a 'thenable', it is chaining a different function
+        // so don't yield since yielding will trigger the .then()
+    } else {
+        result = yield result;
+    }
+
+    if (expr.hasOwnProperty("predicate")) {
+        result = yield* applyPredicates(expr.predicate, result, environment);
+    }
+    if (expr.hasOwnProperty("group")) {
+        result = yield* evaluateGroupExpression(expr.group, result, environment);
+    }
+
+    var exitCallback = environment.lookup("__evaluate_exit");
+    if (exitCallback) {
+        exitCallback(expr, input, environment, result);
+    }
+
+    if (result && result.sequence) {
+        result = result.value();
+    }
+
+    return result;
+}
+
+/**
+ * Evaluate path expression against input data
+ * @param {Object} expr - JSONata expression
+ * @param {Object} input - Input data to evaluate against
+ * @param {Object} environment - Environment
+ * @returns {*} Evaluated input data
+ */
+function* evaluatePath(expr, input, environment) {
+    var inputSequence;
+    // expr is an array of steps
+    // if the first step is a variable reference ($...), including root reference ($$),
+    //   then the path is absolute rather than relative
+    if (expr.steps[0].type === "variable") {
+        inputSequence = createSequence(input); // dummy singleton sequence for first (absolute) step
+    } else if (Array.isArray(input)) {
+        inputSequence = input;
+    } else {
+        // if input is not an array, make it so
+        inputSequence = createSequence(input);
+    }
+
+    var resultSequence;
+
+    // evaluate each step in turn
+    for (var ii = 0; ii < expr.steps.length; ii++) {
+        var step = expr.steps[ii];
+
+        // if the first step is an explicit array constructor, then just evaluate that (i.e. don't iterate over a context array)
+        if (ii === 0 && step.consarray) {
+            resultSequence = yield* evaluate(step, inputSequence, environment);
+        } else {
+            resultSequence = yield* evaluateStep(step, inputSequence, environment, ii === expr.steps.length - 1);
+        }
+
+        if (typeof resultSequence === "undefined" || resultSequence.length === 0) {
+            break;
+        }
+        inputSequence = resultSequence;
+    }
+
+    if (expr.keepSingletonArray) {
+        resultSequence.keepSingleton = true;
+    }
+
+    return resultSequence;
+}
+
+/**
+ * Evaluate a step within a path
+ * @param {Object} expr - JSONata expression
+ * @param {Object} input - Input data to evaluate against
+ * @param {Object} environment - Environment
+ * @param {boolean} lastStep - flag the last step in a path
+ * @returns {*} Evaluated input data
+ */
+function* evaluateStep(expr, input, environment, lastStep) {
+    var result = createSequence();
+
+    for (var ii = 0; ii < input.length; ii++) {
+        var res = yield* evaluate(expr, input[ii], environment);
+        if (typeof res !== "undefined") {
+            result.push(res);
+        }
+    }
+
+    var resultSequence = createSequence();
+    if (lastStep && result.length === 1 && Array.isArray(result[0]) && !result[0].sequence) {
+        resultSequence = result[0];
+    } else {
+        // flatten the sequence
+        result.forEach(function(res) {
+            // TODO: These any casts are a bit sloppy
+            if (!Array.isArray(res) || (res as any).cons || (res as any).keepSingleton) {
+                // it's not an array - just push into the result sequence
+                resultSequence.push(res);
+            } else {
+                // res is a sequence - flatten it into the parent sequence
+                Array.prototype.push.apply(resultSequence, res);
+            }
+        });
+    }
+
+    return resultSequence;
+}
+
+/**
+ * Apply predicates to input data
+ * @param {Object} predicates - Predicates
+ * @param {Object} input - Input data to apply predicates against
+ * @param {Object} environment - Environment
+ * @returns {*} Result after applying predicates
+ */
+function* applyPredicates(predicates, input, environment) {
+    var inputSequence = input;
+    // lhs potentially holds an array
+    // we want to iterate over the array, and only keep the items that are
+    // truthy when applied to the predicate.
+    // if the predicate evaluates to an integer, then select that index
+
+    var results = createSequence();
+    for (var ii = 0; ii < predicates.length; ii++) {
+        var predicate = predicates[ii];
+        // if it's not an array, turn it into one
+        // since in XPath >= 2.0 an item is equivalent to a singleton sequence of that item
+        // if input is not an array, make it so
+        if (!Array.isArray(inputSequence)) {
+            inputSequence = createSequence(inputSequence);
+        }
+        results = createSequence();
+        if (predicate.type === "literal" && isNumeric(predicate.value)) {
+            var index = predicate.value;
+            if (!Number.isInteger(index)) {
+                // round it down
+                index = Math.floor(index);
+            }
+            if (index < 0) {
+                // count in from end of array
+                index = inputSequence.length + index;
+            }
+            results = inputSequence[index];
+        } else {
+            results = yield* evaluateFilter(predicate, inputSequence, environment);
+        }
+        inputSequence = results;
+    }
+    return results;
+}
+
+/**
+ * Apply filter predicate to input data
+ * @param {Object} predicate - filter expression
+ * @param {Object} input - Input data to apply predicates against
+ * @param {Object} environment - Environment
+ * @returns {*} Result after applying predicates
+ */
+function* evaluateFilter(predicate, input, environment) {
+    var results = createSequence();
+    for (var index = 0; index < input.length; index++) {
+        var item = input[index];
+        var res = yield* evaluate(predicate, item, environment);
+        if (isNumeric(res)) {
+            res = [res];
+        }
+        if (isArrayOfNumbers(res)) {
+            res.forEach(function(ires) {
+                if (!Number.isInteger(ires)) {
+                    // round it down
+                    ires = Math.floor(ires);
+                }
+                if (ires < 0) {
+                    // count in from end of array
+                    ires = input.length + ires;
+                }
+                if (ires === index) {
+                    results.push(item);
+                }
+            });
+        } else if (functionBoolean(res)) {
+            // truthy
+            results.push(item);
+        }
+    }
+    return results;
+}
+
+/**
+ * Evaluate binary expression against input data
+ * @param {Object} expr - JSONata expression
+ * @param {Object} input - Input data to evaluate against
+ * @param {Object} environment - Environment
+ * @returns {*} Evaluated input data
+ */
+function* evaluateBinary(expr, input, environment) {
+    var result;
+    var lhs = yield* evaluate(expr.lhs, input, environment);
+    var rhs = yield* evaluate(expr.rhs, input, environment);
+    var op = expr.value;
+
+    try {
+        switch (op) {
+            case "+":
+            case "-":
+            case "*":
+            case "/":
+            case "%":
+                result = evaluateNumericExpression(lhs, rhs, op);
+                break;
+            case "=":
+            case "!=":
+            case "<":
+            case "<=":
+            case ">":
+            case ">=":
+                result = evaluateComparisonExpression(lhs, rhs, op);
+                break;
+            case "&":
+                result = evaluateStringConcat(lhs, rhs);
+                break;
+            case "and":
+            case "or":
+                result = evaluateBooleanExpression(lhs, rhs, op);
+                break;
+            case "..":
+                result = evaluateRangeExpression(lhs, rhs);
+                break;
+            case "in":
+                result = evaluateIncludesExpression(lhs, rhs);
+                break;
+        }
+    } catch (err) {
+        err.position = expr.position;
+        err.token = op;
+        throw err;
+    }
+    return result;
+}
+
+/**
+ * Evaluate unary expression against input data
+ * @param {Object} expr - JSONata expression
+ * @param {Object} input - Input data to evaluate against
+ * @param {Object} environment - Environment
+ * @returns {*} Evaluated input data
+ */
+function* evaluateUnary(expr, input, environment) {
+    var result;
+
+    switch (expr.value) {
+        case "-":
+            result = yield* evaluate(expr.expression, input, environment);
+            if (typeof result === "undefined") {
+                result = undefined;
+            } else if (isNumeric(result)) {
+                result = -result;
+            } else {
+                throw {
+                    code: "D1002",
+                    stack: new Error().stack,
+                    position: expr.position,
+                    token: expr.value,
+                    value: result,
+                };
+            }
+            break;
+        case "[":
+            // array constructor - evaluate each item
+            result = [];
+            for (var ii = 0; ii < expr.expressions.length; ii++) {
+                var item = expr.expressions[ii];
+                var value = yield* evaluate(item, input, environment);
+                if (typeof value !== "undefined") {
+                    if (item.value === "[") {
+                        result.push(value);
+                    } else {
+                        result = functionAppend(result, value);
+                    }
+                }
+            }
+            if (expr.consarray) {
+                Object.defineProperty(result, "cons", {
+                    enumerable: false,
+                    configurable: false,
+                    value: true,
+                });
+            }
+            break;
+        case "{":
+            // object constructor - apply grouping
+            result = yield* evaluateGroupExpression(expr, input, environment);
+            break;
+    }
+    return result;
+}
+
+/**
+ * Evaluate name object against input data
+ * @param {Object} expr - JSONata expression
+ * @param {Object} input - Input data to evaluate against
+ * @param {Object} environment - Environment
+ * @returns {*} Evaluated input data
+ */
+export function evaluateName(expr, input, environment) {
+    // lookup the 'name' item in the input
+    var result;
+    if (Array.isArray(input)) {
+        result = createSequence();
+        for (var ii = 0; ii < input.length; ii++) {
+            var res = evaluateName(expr, input[ii], environment);
+            if (typeof res !== "undefined") {
+                result.push(res);
+            }
+        }
+    } else if (input !== null && typeof input === "object") {
+        result = input[expr.value];
+    }
+    return result;
+}
+
+/**
+ * Evaluate literal against input data
+ * @param {Object} expr - JSONata expression
+ * @returns {*} Evaluated input data
+ */
+function evaluateLiteral(expr, input, environment) {
+    return expr.value;
+}
+
+/**
+ * Evaluate wildcard against input data
+ * @param {Object} expr - JSONata expression
+ * @param {Object} input - Input data to evaluate against
+ * @returns {*} Evaluated input data
+ */
+function evaluateWildcard(expr, input, environment) {
+    var results = createSequence();
+    if (input !== null && typeof input === "object") {
+        Object.keys(input).forEach(function(key) {
+            var value = input[key];
+            if (Array.isArray(value)) {
+                value = flatten(value);
+                results = functionAppend(results, value);
+            } else {
+                results.push(value);
+            }
+        });
+    }
+
+    //        result = normalizeSequence(results);
+    return results;
+}
+
+/**
+ * Evaluate descendants against input data
+ * @param {Object} expr - JSONata expression
+ * @param {Object} input - Input data to evaluate against
+ * @returns {*} Evaluated input data
+ */
+function evaluateDescendants(expr, input, environment) {
+    var result;
+    var resultSequence = createSequence();
+    if (typeof input !== "undefined") {
+        // traverse all descendants of this object/array
+        recurseDescendants(input, resultSequence);
+        if (resultSequence.length === 1) {
+            result = resultSequence[0];
+        } else {
+            result = resultSequence;
+        }
+    }
+    return result;
+}
+
+/**
+ * Recurse through descendants
+ * @param {Object} input - Input data
+ * @param {Object} results - Results
+ */
+function recurseDescendants(input, results) {
+    // this is the equivalent of //* in XPath
+    if (!Array.isArray(input)) {
+        results.push(input);
+    }
+    if (Array.isArray(input)) {
+        input.forEach(function(member) {
+            recurseDescendants(member, results);
+        });
+    } else if (input !== null && typeof input === "object") {
+        Object.keys(input).forEach(function(key) {
+            recurseDescendants(input[key], results);
+        });
+    }
+}
+
+/**
+ * Evaluate numeric expression against input data
+ * @param {Object} lhs - LHS value
+ * @param {Object} rhs - RHS value
+ * @param {Object} op - opcode
+ * @returns {*} Result
+ */
+function evaluateNumericExpression(lhs, rhs, op) {
+    var result;
+
+    if (typeof lhs === "undefined" || typeof rhs === "undefined") {
+        // if either side is undefined, the result is undefined
+        return result;
+    }
+
+    if (!isNumeric(lhs)) {
+        throw {
+            code: "T2001",
+            stack: new Error().stack,
+            value: lhs,
+        };
+    }
+    if (!isNumeric(rhs)) {
+        throw {
+            code: "T2002",
+            stack: new Error().stack,
+            value: rhs,
+        };
+    }
+
+    switch (op) {
+        case "+":
+            result = lhs + rhs;
+            break;
+        case "-":
+            result = lhs - rhs;
+            break;
+        case "*":
+            result = lhs * rhs;
+            break;
+        case "/":
+            result = lhs / rhs;
+            break;
+        case "%":
+            result = lhs % rhs;
+            break;
+    }
+    return result;
+}
+
+/**
+ * Evaluate comparison expression against input data
+ * @param {Object} lhs - LHS value
+ * @param {Object} rhs - RHS value
+ * @param {Object} op - opcode
+ * @returns {*} Result
+ */
+function evaluateComparisonExpression(lhs, rhs, op) {
+    var result;
+
+    // type checks
+    var ltype = typeof lhs;
+    var rtype = typeof rhs;
+
+    if (ltype === "undefined" || rtype === "undefined") {
+        // if either side is undefined, the result is false
+        return false;
+    }
+
+    var validate = function() {
+        // if aa or bb are not string or numeric values, then throw an error
+        if (!(ltype === "string" || ltype === "number") || !(rtype === "string" || rtype === "number")) {
+            throw {
+                code: "T2010",
+                stack: new Error().stack,
+                value: !(ltype === "string" || ltype === "number") ? lhs : rhs,
+            };
+        }
+
+        //if aa and bb are not of the same type
+        if (ltype !== rtype) {
+            throw {
+                code: "T2009",
+                stack: new Error().stack,
+                value: lhs,
+                value2: rhs,
+            };
+        }
+    };
+
+    switch (op) {
+        case "=":
+            result = lhs === rhs;
+            break;
+        case "!=":
+            result = lhs !== rhs;
+            break;
+        case "<":
+            validate();
+            result = lhs < rhs;
+            break;
+        case "<=":
+            validate();
+            result = lhs <= rhs;
+            break;
+        case ">":
+            validate();
+            result = lhs > rhs;
+            break;
+        case ">=":
+            validate();
+            result = lhs >= rhs;
+            break;
+    }
+    return result;
+}
+
+/**
+ * Inclusion operator - in
+ *
+ * @param {Object} lhs - LHS value
+ * @param {Object} rhs - RHS value
+ * @returns {boolean} - true if lhs is a member of rhs
+ */
+function evaluateIncludesExpression(lhs, rhs) {
+    var result = false;
+
+    if (typeof lhs === "undefined" || typeof rhs === "undefined") {
+        // if either side is undefined, the result is false
+        return false;
+    }
+
+    if (!Array.isArray(rhs)) {
+        rhs = [rhs];
+    }
+
+    for (var i = 0; i < rhs.length; i++) {
+        if (rhs[i] === lhs) {
+            result = true;
+            break;
+        }
+    }
+
+    return result;
+}
+
+/**
+ * Evaluate boolean expression against input data
+ * @param {Object} lhs - LHS value
+ * @param {Object} rhs - RHS value
+ * @param {Object} op - opcode
+ * @returns {*} Result
+ */
+function evaluateBooleanExpression(lhs, rhs, op) {
+    var result;
+
+    switch (op) {
+        case "and":
+            result = functionBoolean(lhs) && functionBoolean(rhs);
+            break;
+        case "or":
+            result = functionBoolean(lhs) || functionBoolean(rhs);
+            break;
+    }
+    return result;
+}
+
+/**
+ * Evaluate string concatenation against input data
+ * @param {Object} lhs - LHS value
+ * @param {Object} rhs - RHS value
+ * @returns {string|*} Concatenated string
+ */
+function evaluateStringConcat(lhs, rhs) {
+    var result;
+
+    var lstr = "";
+    var rstr = "";
+    if (typeof lhs !== "undefined") {
+        lstr = functionString(lhs);
+    }
+    if (typeof rhs !== "undefined") {
+        rstr = functionString(rhs);
+    }
+
+    result = lstr.concat(rstr);
+    return result;
+}
+
+/**
+ * Evaluate group expression against input data
+ * @param {Object} expr - JSONata expression
+ * @param {Object} input - Input data to evaluate against
+ * @param {Object} environment - Environment
+ * @returns {{}} Evaluated input data
+ */
+function* evaluateGroupExpression(expr, input, environment) {
+    var result = {};
+    var groups = {};
+    // group the input sequence by 'key' expression
+    if (!Array.isArray(input)) {
+        input = createSequence(input);
+    }
+    for (var itemIndex = 0; itemIndex < input.length; itemIndex++) {
+        var item = input[itemIndex];
+        for (var pairIndex = 0; pairIndex < expr.lhs.length; pairIndex++) {
+            var pair = expr.lhs[pairIndex];
+            var key = yield* evaluate(pair[0], item, environment);
+            // key has to be a string
+            if (typeof key !== "string") {
+                throw {
+                    code: "T1003",
+                    stack: new Error().stack,
+                    position: expr.position,
+                    value: key,
+                };
+            }
+            var entry = { data: item, expr: pair[1] };
+            if (groups.hasOwnProperty(key)) {
+                // a value already exists in this slot
+                // append it as an array
+                groups[key].data = functionAppend(groups[key].data, item);
+            } else {
+                groups[key] = entry;
+            }
+        }
+    }
+
+    // iterate over the groups to evaluate the 'value' expression
+    for (key in groups) {
+        entry = groups[key];
+        var value = yield* evaluate(entry.expr, entry.data, environment);
+        if (typeof value !== "undefined") {
+            result[key] = value;
+        }
+    }
+
+    return result;
+}
+
+/**
+ * Evaluate range expression against input data
+ * @param {Object} lhs - LHS value
+ * @param {Object} rhs - RHS value
+ * @returns {Array} Resultant array
+ */
+function evaluateRangeExpression(lhs, rhs) {
+    var result;
+
+    if (typeof lhs === "undefined" || typeof rhs === "undefined") {
+        // if either side is undefined, the result is undefined
+        return result;
+    }
+
+    if (lhs > rhs) {
+        // if the lhs is greater than the rhs, return undefined
+        return result;
+    }
+
+    if (!Number.isInteger(lhs)) {
+        throw {
+            code: "T2003",
+            stack: new Error().stack,
+            value: lhs,
+        };
+    }
+    if (!Number.isInteger(rhs)) {
+        throw {
+            code: "T2004",
+            stack: new Error().stack,
+            value: rhs,
+        };
+    }
+
+    result = new Array(rhs - lhs + 1);
+    for (var item = lhs, index = 0; item <= rhs; item++, index++) {
+        result[index] = item;
+    }
+    return toSequence(result);
+}
+
+/**
+ * Evaluate bind expression against input data
+ * @param {Object} expr - JSONata expression
+ * @param {Object} input - Input data to evaluate against
+ * @param {Object} environment - Environment
+ * @returns {*} Evaluated input data
+ */
+function* evaluateBindExpression(expr, input, environment) {
+    // The RHS is the expression to evaluate
+    // The LHS is the name of the variable to bind to - should be a VARIABLE token
+    var value = yield* evaluate(expr.rhs, input, environment);
+    if (expr.lhs.type !== "variable") {
+        throw {
+            code: "D2005",
+            stack: new Error().stack,
+            position: expr.position,
+            token: expr.value,
+            value: expr.lhs.type === "path" ? expr.lhs.steps[0].value : expr.lhs.value,
+        };
+    }
+    environment.bind(expr.lhs.value, value);
+    return value;
+}
+
+/**
+ * Evaluate condition against input data
+ * @param {Object} expr - JSONata expression
+ * @param {Object} input - Input data to evaluate against
+ * @param {Object} environment - Environment
+ * @returns {*} Evaluated input data
+ */
+function* evaluateCondition(expr, input, environment) {
+    var result;
+    var condition = yield* evaluate(expr.condition, input, environment);
+    if (functionBoolean(condition)) {
+        result = yield* evaluate(expr.then, input, environment);
+    } else if (typeof expr.else !== "undefined") {
+        result = yield* evaluate(expr.else, input, environment);
+    }
+    return result;
+}
+
+/**
+ * Evaluate block against input data
+ * @param {Object} expr - JSONata expression
+ * @param {Object} input - Input data to evaluate against
+ * @param {Object} environment - Environment
+ * @returns {*} Evaluated input data
+ */
+function* evaluateBlock(expr, input, environment) {
+    var result;
+    // create a new frame to limit the scope of variable assignments
+    // TODO, only do this if the post-parse stage has flagged this as required
+    var frame = createFrame(environment);
+    // invoke each expression in turn
+    // only return the result of the last one
+    for (var ii = 0; ii < expr.expressions.length; ii++) {
+        result = yield* evaluate(expr.expressions[ii], input, frame);
+    }
+
+    return result;
+}
+
+/**
+ * Prepare a regex
+ * @param {Object} expr - expression containing regex
+ * @returns {Function} Higher order function representing prepared regex
+ */
+function evaluateRegex(expr, input, environment) {
+    expr.value.lastIndex = 0;
+    var closure = function(str) {
+        var re = expr.value;
+        var result;
+        var match = re.exec(str);
+        if (match !== null) {
+            result = {
+                match: match[0],
+                start: match.index,
+                end: match.index + match[0].length,
+                groups: [],
+            };
+            if (match.length > 1) {
+                for (var i = 1; i < match.length; i++) {
+                    result.groups.push(match[i]);
+                }
+            }
+            result.next = function() {
+                if (re.lastIndex >= str.length) {
+                    return undefined;
+                } else {
+                    var next = closure(str);
+                    if (next && next.match === "" && re.lastIndex === expr.value.lastIndex) {
+                        // matches zero length string; this will never progress
+                        throw {
+                            code: "D1004",
+                            stack: new Error().stack,
+                            position: expr.position,
+                            value: expr.value.source,
+                        };
+                    }
+                    return next;
+                }
+            };
+        }
+
+        return result;
+    };
+    return closure;
+}
+
+/**
+ * Evaluate variable against input data
+ * @param {Object} expr - JSONata expression
+ * @param {Object} input - Input data to evaluate against
+ * @param {Object} environment - Environment
+ * @returns {*} Evaluated input data
+ */
+function evaluateVariable(expr, input, environment) {
+    // lookup the variable value in the environment
+    var result;
+    // if the variable name is empty string, then it refers to context value
+    if (expr.value === "") {
+        result = input;
+    } else {
+        result = environment.lookup(expr.value);
+    }
+    return result;
+}
+
+/**
+ * sort / order-by operator
+ * @param {Object} expr - AST for operator
+ * @param {Object} input - Input data to evaluate against
+ * @param {Object} environment - Environment
+ * @returns {*} Ordered sequence
+ */
+function* evaluateSortExpression(expr, input, environment) {
+    var result;
+
+    // evaluate the lhs, then sort the results in order according to rhs expression
+    var lhs = yield* evaluate(expr.lhs, input, environment);
+
+    // sort the lhs array
+    // use comparator function
+    var comparator = function(a, b) {
+        // expr.rhs is an array of order-by in priority order
+        var comp = 0;
+        for (var index = 0; comp === 0 && index < expr.rhs.length; index++) {
+            var term = expr.rhs[index];
+            //evaluate the rhs expression in the context of a
+            var aa = driveGenerator(term.expression, a, environment);
+            //evaluate the rhs expression in the context of b
+            var bb = driveGenerator(term.expression, b, environment);
+
+            // type checks
+            var atype = typeof aa;
+            var btype = typeof bb;
+            // undefined should be last in sort order
+            if (atype === "undefined") {
+                // swap them, unless btype is also undefined
+                comp = btype === "undefined" ? 0 : 1;
+                continue;
+            }
+            if (btype === "undefined") {
+                comp = -1;
+                continue;
+            }
+
+            // if aa or bb are not string or numeric values, then throw an error
+            if (!(atype === "string" || atype === "number") || !(btype === "string" || btype === "number")) {
+                throw {
+                    code: "T2008",
+                    stack: new Error().stack,
+                    position: expr.position,
+                    value: !(atype === "string" || atype === "number") ? aa : bb,
+                };
+            }
+
+            //if aa and bb are not of the same type
+            if (atype !== btype) {
+                throw {
+                    code: "T2007",
+                    stack: new Error().stack,
+                    position: expr.position,
+                    value: aa,
+                    value2: bb,
+                };
+            }
+            if (aa === bb) {
+                // both the same - move on to next term
+                continue;
+            } else if (aa < bb) {
+                comp = -1;
+            } else {
+                comp = 1;
+            }
+            if (term.descending === true) {
+                comp = -comp;
+            }
+        }
+        // only swap a & b if comp equals 1
+        return comp === 1;
+    };
+
+    result = functionSort(lhs, comparator);
+
+    return result;
+}
+
+/**
+ * create a transformer function
+ * @param {Object} expr - AST for operator
+ * @param {Object} input - Input data to evaluate against
+ * @param {Object} environment - Environment
+ * @returns {*} tranformer function
+ */
+function evaluateTransformExpression(expr, input, environment) {
+    // create a function to implement the transform definition
+    var transformer = function*(obj) {
+        // signature <(oa):o>
+        // undefined inputs always return undefined
+        if (typeof obj === "undefined") {
+            return undefined;
+        }
+
+        // this function returns a copy of obj with changes specified by the pattern/operation
+        var cloneFunction = environment.lookup("clone");
+        if (!isFunction(cloneFunction)) {
+            // throw type error
+            throw {
+                code: "T2013",
+                stack: new Error().stack,
+                position: expr.position,
+            };
+        }
+        var result = yield* apply(cloneFunction, [obj], environment);
+        var matches = yield* evaluate(expr.pattern, result, environment);
+        if (typeof matches !== "undefined") {
+            if (!Array.isArray(matches)) {
+                matches = [matches];
+            }
+            for (var ii = 0; ii < matches.length; ii++) {
+                var match = matches[ii];
+                // evaluate the update value for each match
+                var update = yield* evaluate(expr.update, match, environment);
+                // update must be an object
+                var updateType = typeof update;
+                if (updateType !== "undefined") {
+                    if (updateType !== "object" || update === null) {
+                        // throw type error
+                        throw {
+                            code: "T2011",
+                            stack: new Error().stack,
+                            position: expr.update.position,
+                            value: update,
+                        };
+                    }
+                    // merge the update
+                    for (var prop in update) {
+                        match[prop] = update[prop];
+                    }
+                }
+
+                // delete, if specified, must be an array of strings (or single string)
+                if (typeof expr.delete !== "undefined") {
+                    var deletions = yield* evaluate(expr.delete, match, environment);
+                    if (typeof deletions !== "undefined") {
+                        var val = deletions;
+                        if (!Array.isArray(deletions)) {
+                            deletions = [deletions];
+                        }
+                        if (!isArrayOfStrings(deletions)) {
+                            // throw type error
+                            throw {
+                                code: "T2012",
+                                stack: new Error().stack,
+                                position: expr.delete.position,
+                                value: val,
+                            };
+                        }
+                        for (var jj = 0; jj < deletions.length; jj++) {
+                            delete match[deletions[jj]];
+                        }
+                    }
+                }
+            }
+        }
+
+        return result;
+    };
+
+    return defineFunction(transformer, "<(oa):o>");
+}
+
+/**
+ * Evaluate an expression by driving the generator to completion
+ * Used when it's not possible to yield
+ * @param {Object} expr - AST
+ * @param {Object} input - Input data to evaluate against
+ * @param {Object} environment - Environment
+ * @returns {*} result
+ */
+function driveGenerator(expr, input, environment) {
+    var gen = evaluate(expr, input, environment);
+    // returns a generator - so iterate over it
+    var comp = gen.next();
+    while (!comp.done) {
+        comp = gen.next(comp.value);
+    }
+    return comp.value;
+}
+
+/**
+ * Apply the function on the RHS using the sequence on the LHS as the first argument
+ * @param {Object} expr - JSONata expression
+ * @param {Object} input - Input data to evaluate against
+ * @param {Object} environment - Environment
+ * @returns {*} Evaluated input data
+ */
+function* evaluateApplyExpression(expr, input, environment) {
+    var result;
+
+    const standardFrame = createStandardFrame();
+    var chain = driveGenerator(parser("function($f, $g) { function($x){ $g($f($x)) } }"), null, standardFrame);
+
+    if (expr.rhs.type === "function") {
+        // this is a function _invocation_; invoke it with lhs expression as the first argument
+        expr.rhs.arguments.unshift(expr.lhs);
+        result = yield* evaluateFunction(expr.rhs, input, environment);
+        expr.rhs.arguments.shift();
+    } else {
+        var lhs = yield* evaluate(expr.lhs, input, environment);
+        var func = yield* evaluate(expr.rhs, input, environment);
+
+        if (!isFunction(func)) {
+            throw {
+                code: "T2006",
+                stack: new Error().stack,
+                position: expr.position,
+                value: func,
+            };
+        }
+
+        if (isFunction(lhs)) {
+            // this is function chaining (func1 ~> func2)
+            // λ($f, $g) { λ($x){ $g($f($x)) } }
+            result = yield* apply(chain, [lhs, func], environment);
+        } else {
+            result = yield* apply(func, [lhs], environment);
+        }
+    }
+
+    return result;
+}
+
+/**
+ * Evaluate function against input data
+ * @param {Object} expr - JSONata expression
+ * @param {Object} input - Input data to evaluate against
+ * @param {Object} environment - Environment
+ * @param {Object} [applyto] - LHS of ~> operator
+ * @returns {*} Evaluated input data
+ */
+function* evaluateFunction(expr, input, environment) {
+    var result;
+
+    // create the procedure
+    // can't assume that expr.procedure is a lambda type directly
+    // could be an expression that evaluates to a function (e.g. variable reference, parens expr etc.
+    // evaluate it generically first, then check that it is a function.  Throw error if not.
+    var proc = yield* evaluate(expr.procedure, input, environment);
+
+    if (
+        typeof proc === "undefined" &&
+        expr.procedure.type === "path" &&
+        environment.lookup(expr.procedure.steps[0].value)
+    ) {
+        // help the user out here if they simply forgot the leading $
+        throw {
+            code: "T1005",
+            stack: new Error().stack,
+            position: expr.position,
+            token: expr.procedure.steps[0].value,
+        };
+    }
+
+    var evaluatedArgs = [];
+    // eager evaluation - evaluate the arguments
+    for (var jj = 0; jj < expr.arguments.length; jj++) {
+        evaluatedArgs.push(yield* evaluate(expr.arguments[jj], input, environment));
+    }
+    // apply the procedure
+    try {
+        result = yield* apply(proc, evaluatedArgs, input);
+    } catch (err) {
+        // add the position field to the error
+        err.position = expr.position;
+        // and the function identifier
+        err.token = expr.procedure.type === "path" ? expr.procedure.steps[0].value : expr.procedure.value;
+        throw err;
+    }
+    return result;
+}
+
+/**
+ * Apply procedure or function
+ * @param {Object} proc - Procedure
+ * @param {Array} args - Arguments
+ * @param {Object} self - Self
+ * @returns {*} Result of procedure
+ */
+export function* apply(proc, args, self) {
+    var result;
+    result = yield* applyInner(proc, args, self);
+    while (isLambda(result) && result.thunk === true) {
+        // trampoline loop - this gets invoked as a result of tail-call optimization
+        // the function returned a tail-call thunk
+        // unpack it, evaluate its arguments, and apply the tail call
+        var next = yield* evaluate(result.body.procedure, result.input, result.environment);
+        var evaluatedArgs = [];
+        for (var ii = 0; ii < result.body.arguments.length; ii++) {
+            evaluatedArgs.push(yield* evaluate(result.body.arguments[ii], result.input, result.environment));
+        }
+
+        result = yield* applyInner(next, evaluatedArgs, self);
+    }
+    return result;
+}
+
+/**
+ * Apply procedure or function
+ * @param {Object} proc - Procedure
+ * @param {Array} args - Arguments
+ * @param {Object} self - Self
+ * @returns {*} Result of procedure
+ */
+function* applyInner(proc, args, self) {
+    var result;
+    var validatedArgs = args;
+    if (proc) {
+        validatedArgs = validateArguments(proc.signature, args, self);
+    }
+    if (isLambda(proc)) {
+        result = yield* applyProcedure(proc, validatedArgs);
+    } else if (proc && proc._jsonata_function === true) {
+        result = proc.implementation.apply(self, validatedArgs);
+        // `proc.implementation` might be a generator function
+        // and `result` might be a generator - if so, yield
+        if (isGenerator(result)) {
+            result = yield* result;
+        }
+    } else if (typeof proc === "function") {
+        result = proc.apply(self, validatedArgs);
+        /* istanbul ignore next */
+        if (isGenerator(result)) {
+            result = yield* result;
+        }
+    } else {
+        throw {
+            code: "T1006",
+            stack: new Error().stack,
+        };
+    }
+    return result;
+}
+
+/**
+ * Evaluate lambda against input data
+ * @param {Object} expr - JSONata expression
+ * @param {Object} input - Input data to evaluate against
+ * @param {Object} environment - Environment
+ * @returns {{lambda: boolean, input: *, environment: *, arguments: *, body: *}} Evaluated input data
+ */
+function evaluateLambda(expr, input, environment) {
+    // make a function (closure)
+    var procedure = {
+        _jsonata_lambda: true,
+        input: input,
+        environment: environment,
+        arguments: expr.arguments,
+        signature: expr.signature,
+        body: expr.body,
+        thunk: undefined,
+    };
+    if (expr.thunk === true) {
+        procedure.thunk = true;
+    }
+    return procedure;
+}
+
+/**
+ * Evaluate partial application
+ * @param {Object} expr - JSONata expression
+ * @param {Object} input - Input data to evaluate against
+ * @param {Object} environment - Environment
+ * @returns {*} Evaluated input data
+ */
+function* evaluatePartialApplication(expr, input, environment) {
+    // partially apply a function
+    var result;
+    // evaluate the arguments
+    var evaluatedArgs = [];
+    for (var ii = 0; ii < expr.arguments.length; ii++) {
+        var arg = expr.arguments[ii];
+        if (arg.type === "operator" && arg.value === "?") {
+            evaluatedArgs.push(arg);
+        } else {
+            evaluatedArgs.push(yield* evaluate(arg, input, environment));
+        }
+    }
+    // lookup the procedure
+    var proc = yield* evaluate(expr.procedure, input, environment);
+    if (
+        typeof proc === "undefined" &&
+        expr.procedure.type === "path" &&
+        environment.lookup(expr.procedure.steps[0].value)
+    ) {
+        // help the user out here if they simply forgot the leading $
+        throw {
+            code: "T1007",
+            stack: new Error().stack,
+            position: expr.position,
+            token: expr.procedure.steps[0].value,
+        };
+    }
+    if (isLambda(proc)) {
+        result = partialApplyProcedure(proc, evaluatedArgs);
+    } else if (proc && proc._jsonata_function === true) {
+        result = partialApplyNativeFunction(proc.implementation, evaluatedArgs);
+    } else if (typeof proc === "function") {
+        result = partialApplyNativeFunction(proc, evaluatedArgs);
+    } else {
+        throw {
+            code: "T1008",
+            stack: new Error().stack,
+            position: expr.position,
+            token: expr.procedure.type === "path" ? expr.procedure.steps[0].value : expr.procedure.value,
+        };
+    }
+    return result;
+}
+
+/**
+ * Partially apply procedure
+ * @param {Object} proc - Procedure
+ * @param {Array} args - Arguments
+ * @returns {{lambda: boolean, input: *, environment: {bind, lookup}, arguments: Array, body: *}} Result of partially applied procedure
+ */
+function partialApplyProcedure(proc, args) {
+    // create a closure, bind the supplied parameters and return a function that takes the remaining (?) parameters
+    var env = createFrame(proc.environment);
+    var unboundArgs = [];
+    proc.arguments.forEach(function(param, index) {
+        var arg = args[index];
+        if (arg && arg.type === "operator" && arg.value === "?") {
+            unboundArgs.push(param);
+        } else {
+            env.bind(param.value, arg);
+        }
+    });
+    var procedure = {
+        _jsonata_lambda: true,
+        input: proc.input,
+        environment: env,
+        arguments: unboundArgs,
+        body: proc.body,
+    };
+    return procedure;
+}
+
+/**
+ * Partially apply native function
+ * @param {Function} native - Native function
+ * @param {Array} args - Arguments
+ * @returns {{lambda: boolean, input: *, environment: {bind, lookup}, arguments: Array, body: *}} Result of partially applying native function
+ */
+function partialApplyNativeFunction(native, args) {
+    // create a lambda function that wraps and invokes the native function
+    // get the list of declared arguments from the native function
+    // this has to be picked out from the toString() value
+    var sigArgs = getNativeFunctionArguments(native);
+    sigArgs = sigArgs.map(function(sigArg) {
+        return "$" + sigArg.trim();
+    });
+    var body = "function(" + sigArgs.join(", ") + "){ _ }";
+
+    var bodyAST = parser(body);
+
+    /* istanbul ignore else */
+    if (bodyAST.type==="lambda") {
+        // TODO: Check node type...
+        bodyAST.body = native;
+    } else {
+        throw new Error("Expected parsing of partially applied native function to return a 'lambda' node");
+    }
+
+    var partial = partialApplyProcedure(bodyAST, args);
+    return partial;
+}
+
+/**
+ * Apply native function
+ * @param {Object} proc - Procedure
+ * @param {Object} env - Environment
+ * @returns {*} Result of applying native function
+ */
+function* applyNativeFunction(proc, env) {
+    var sigArgs = getNativeFunctionArguments(proc);
+    // generate the array of arguments for invoking the function - look them up in the environment
+    var args = sigArgs.map(function(sigArg) {
+        return env.lookup(sigArg.trim());
+    });
+
+    var result = proc.apply(null, args);
+    if (isGenerator(result)) {
+        result = yield* result;
+    }
+    return result;
+}
+
+/**
+ * Get native function arguments
+ * @param {Function} func - Function
+ * @returns {*|Array} Native function arguments
+ */
+function getNativeFunctionArguments(func) {
+    var signature = func.toString();
+    var sigParens = /\(([^)]*)\)/.exec(signature)[1]; // the contents of the parens
+    var sigArgs = sigParens.split(",");
+    return sigArgs;
+}
+
+/**
+ * Validate the arguments against the signature validator (if it exists)
+ * @param {Function} signature - validator function
+ * @param {Array} args - function arguments
+ * @param {*} context - context value
+ * @returns {Array} - validated arguments
+ */
+function validateArguments(signature, args, context) {
+    if (typeof signature === "undefined") {
+        // nothing to validate
+        return args;
+    }
+    var validatedArgs = signature.validate(args, context);
+    return validatedArgs;
+}
+
+/**
+ * Apply procedure
+ * @param {Object} proc - Procedure
+ * @param {Array} args - Arguments
+ * @returns {*} Result of procedure
+ */
+function* applyProcedure(proc, args) {
+    var result;
+    var env = createFrame(proc.environment);
+    proc.arguments.forEach(function(param, index) {
+        env.bind(param.value, args[index]);
+    });
+    if (typeof proc.body === "function") {
+        // this is a lambda that wraps a native function - generated by partially evaluating a native
+        result = yield* applyNativeFunction(proc.body, env);
+    } else {
+        result = yield* evaluate(proc.body, proc.input, env);
+    }
+    return result;
+}
diff --git a/src/functions.ts b/src/functions.ts
new file mode 100644
index 00000000..d95721d7
--- /dev/null
+++ b/src/functions.ts
@@ -0,0 +1,1888 @@
+import { isFunction, isNumeric, createSequence, isLambda, isArrayOfNumbers, isArrayOfStrings, createFrame } from './utils';
+import { defineFunction } from './signatures';
+import { apply, evaluateName } from './evaluate';
+
+/**
+ * Sum function
+ * @param {Object} args - Arguments
+ * @returns {number} Total value of arguments
+ */
+export function functionSum(args) {
+    // undefined inputs always return undefined
+    if (typeof args === "undefined") {
+        return undefined;
+    }
+
+    var total = 0;
+    args.forEach(function(num) {
+        total += num;
+    });
+    return total;
+}
+
+/**
+ * Count function
+ * @param {Object} args - Arguments
+ * @returns {number} Number of elements in the array
+ */
+export function functionCount(args) {
+    // undefined inputs always return undefined
+    if (typeof args === "undefined") {
+        return 0;
+    }
+
+    return args.length;
+}
+
+/**
+ * Max function
+ * @param {Object} args - Arguments
+ * @returns {number} Max element in the array
+ */
+export function functionMax(args) {
+    // undefined inputs always return undefined
+    if (typeof args === "undefined" || args.length === 0) {
+        return undefined;
+    }
+
+    return Math.max.apply(Math, args);
+}
+
+/**
+ * Min function
+ * @param {Object} args - Arguments
+ * @returns {number} Min element in the array
+ */
+export function functionMin(args) {
+    // undefined inputs always return undefined
+    if (typeof args === "undefined" || args.length === 0) {
+        return undefined;
+    }
+
+    return Math.min.apply(Math, args);
+}
+
+/**
+ * Average function
+ * @param {Object} args - Arguments
+ * @returns {number} Average element in the array
+ */
+export function functionAverage(args) {
+    // undefined inputs always return undefined
+    if (typeof args === "undefined" || args.length === 0) {
+        return undefined;
+    }
+
+    var total = 0;
+    args.forEach(function(num) {
+        total += num;
+    });
+    return total / args.length;
+}
+
+/**
+ * Stingify arguments
+ * @param {Object} arg - Arguments
+ * @returns {String} String from arguments
+ */
+export function functionString(arg) {
+    // undefined inputs always return undefined
+    if (typeof arg === "undefined") {
+        return undefined;
+    }
+
+    var str;
+
+    if (typeof arg === "string") {
+        // already a string
+        str = arg;
+    } else if (isFunction(arg)) {
+        // functions (built-in and lambda convert to empty string
+        str = "";
+    } else if (typeof arg === "number" && !isFinite(arg)) {
+        throw {
+            code: "D3001",
+            value: arg,
+            stack: new Error().stack,
+        };
+    } else
+        str = JSON.stringify(arg, function(key, val) {
+            return typeof val !== "undefined" && val !== null && val.toPrecision && isNumeric(val)
+                ? Number(val.toPrecision(13))
+                : val && isFunction(val) ? "" : val;
+        });
+    return str;
+}
+
+/**
+ * Create substring based on character number and length
+ * @param {String} str - String to evaluate
+ * @param {Integer} start - Character number to start substring
+ * @param {Integer} [length] - Number of characters in substring
+ * @returns {string|*} Substring
+ */
+export function functionSubstring(str, start, length) {
+    // undefined inputs always return undefined
+    if (typeof str === "undefined") {
+        return undefined;
+    }
+
+    return str.substr(start, length);
+}
+
+/**
+ * Create substring up until a character
+ * @param {String} str - String to evaluate
+ * @param {String} chars - Character to define substring boundary
+ * @returns {*} Substring
+ */
+export function functionSubstringBefore(str, chars) {
+    // undefined inputs always return undefined
+    if (typeof str === "undefined") {
+        return undefined;
+    }
+
+    var pos = str.indexOf(chars);
+    if (pos > -1) {
+        return str.substr(0, pos);
+    } else {
+        return str;
+    }
+}
+
+/**
+ * Create substring after a character
+ * @param {String} str - String to evaluate
+ * @param {String} chars - Character to define substring boundary
+ * @returns {*} Substring
+ */
+export function functionSubstringAfter(str, chars) {
+    // undefined inputs always return undefined
+    if (typeof str === "undefined") {
+        return undefined;
+    }
+
+    var pos = str.indexOf(chars);
+    if (pos > -1) {
+        return str.substr(pos + chars.length);
+    } else {
+        return str;
+    }
+}
+
+/**
+ * Lowercase a string
+ * @param {String} str - String to evaluate
+ * @returns {string} Lowercase string
+ */
+export function functionLowercase(str) {
+    // undefined inputs always return undefined
+    if (typeof str === "undefined") {
+        return undefined;
+    }
+
+    return str.toLowerCase();
+}
+
+/**
+ * Uppercase a string
+ * @param {String} str - String to evaluate
+ * @returns {string} Uppercase string
+ */
+export function functionUppercase(str) {
+    // undefined inputs always return undefined
+    if (typeof str === "undefined") {
+        return undefined;
+    }
+
+    return str.toUpperCase();
+}
+
+/**
+ * length of a string
+ * @param {String} str - string
+ * @returns {Number} The number of characters in the string
+ */
+export function functionLength(str) {
+    // undefined inputs always return undefined
+    if (typeof str === "undefined") {
+        return undefined;
+    }
+
+    return str.length;
+}
+
+/**
+ * Normalize and trim whitespace within a string
+ * @param {string} str - string to be trimmed
+ * @returns {string} - trimmed string
+ */
+export function functionTrim(str) {
+    // undefined inputs always return undefined
+    if (typeof str === "undefined") {
+        return undefined;
+    }
+
+    // normalize whitespace
+    var result = str.replace(/[ \t\n\r]+/gm, " ");
+    if (result.charAt(0) === " ") {
+        // strip leading space
+        result = result.substring(1);
+    }
+    if (result.charAt(result.length - 1) === " ") {
+        // strip trailing space
+        result = result.substring(0, result.length - 1);
+    }
+    return result;
+}
+
+/**
+ * Pad a string to a minimum width by adding characters to the start or end
+ * @param {string} str - string to be padded
+ * @param {number} width - the minimum width; +ve pads to the right, -ve pads to the left
+ * @param {string} [char] - the pad character(s); defaults to ' '
+ * @returns {string} - padded string
+ */
+export function functionPad(str, width, char) {
+    // undefined inputs always return undefined
+    if (typeof str === "undefined") {
+        return undefined;
+    }
+
+    if (typeof char === "undefined" || char.length === 0) {
+        char = " ";
+    }
+
+    var result;
+    var padLength = Math.abs(width) - str.length;
+    if (padLength > 0) {
+        var padding = new Array(padLength + 1).join(char);
+        if (char.length > 1) {
+            padding = padding.substring(0, padLength);
+        }
+        if (width > 0) {
+            result = str + padding;
+        } else {
+            result = padding + str;
+        }
+    } else {
+        result = str;
+    }
+    return result;
+}
+
+/**
+ * Tests if the str contains the token
+ * @param {String} str - string to test
+ * @param {String} token - substring or regex to find
+ * @returns {Boolean} - true if str contains token
+ */
+export function functionContains(str, token) {
+    // undefined inputs always return undefined
+    if (typeof str === "undefined") {
+        return undefined;
+    }
+
+    var result;
+
+    if (typeof token === "string") {
+        result = str.indexOf(token) !== -1;
+    } else {
+        var matches = token(str);
+        result = typeof matches !== "undefined";
+    }
+
+    return result;
+}
+
+/**
+ * Match a string with a regex returning an array of object containing details of each match
+ * @param {String} str - string
+ * @param {String} regex - the regex applied to the string
+ * @param {Integer} [limit] - max number of matches to return
+ * @returns {Array} The array of match objects
+ */
+export function functionMatch(str, regex, limit) {
+    // undefined inputs always return undefined
+    if (typeof str === "undefined") {
+        return undefined;
+    }
+
+    // limit, if specified, must be a non-negative number
+    if (limit < 0) {
+        throw {
+            stack: new Error().stack,
+            value: limit,
+            code: "D3040",
+            index: 3,
+        };
+    }
+
+    var result = createSequence();
+
+    if (typeof limit === "undefined" || limit > 0) {
+        var count = 0;
+        var matches = regex(str);
+        if (typeof matches !== "undefined") {
+            while (typeof matches !== "undefined" && (typeof limit === "undefined" || count < limit)) {
+                result.push({
+                    match: matches.match,
+                    index: matches.start,
+                    groups: matches.groups,
+                });
+                matches = matches.next();
+                count++;
+            }
+        }
+    }
+
+    return result;
+}
+
+/**
+ * Match a string with a regex returning an array of object containing details of each match
+ * @param {String} str - string
+ * @param {String} pattern - the substring/regex applied to the string
+ * @param {String} replacement - text to replace the matched substrings
+ * @param {Integer} [limit] - max number of matches to return
+ * @returns {Array} The array of match objects
+ */
+function* functionReplace(str, pattern, replacement, limit) {
+    // undefined inputs always return undefined
+    if (typeof str === "undefined") {
+        return undefined;
+    }
+
+    // pattern cannot be an empty string
+    if (pattern === "") {
+        throw {
+            code: "D3010",
+            stack: new Error().stack,
+            value: pattern,
+            index: 2,
+        };
+    }
+
+    // limit, if specified, must be a non-negative number
+    if (limit < 0) {
+        throw {
+            code: "D3011",
+            stack: new Error().stack,
+            value: limit,
+            index: 4,
+        };
+    }
+
+    var replacer;
+    if (typeof replacement === "string") {
+        replacer = function(regexMatch) {
+            var substitute = "";
+            // scan forward, copying the replacement text into the substitute string
+            // and replace any occurrence of $n with the values matched by the regex
+            var position = 0;
+            var index = replacement.indexOf("$", position);
+            while (index !== -1 && position < replacement.length) {
+                substitute += replacement.substring(position, index);
+                position = index + 1;
+                var dollarVal = replacement.charAt(position);
+                if (dollarVal === "$") {
+                    // literal $
+                    substitute += "$";
+                    position++;
+                } else if (dollarVal === "0") {
+                    substitute += regexMatch.match;
+                    position++;
+                } else {
+                    var maxDigits;
+                    if (regexMatch.groups.length === 0) {
+                        // no sub-matches; any $ followed by a digit will be replaced by an empty string
+                        maxDigits = 1;
+                    } else {
+                        // max number of digits to parse following the $
+                        maxDigits = Math.floor(Math.log(regexMatch.groups.length) * Math.LOG10E) + 1;
+                    }
+                    index = parseInt(replacement.substring(position, position + maxDigits), 10);
+                    if (maxDigits > 1 && index > regexMatch.groups.length) {
+                        index = parseInt(replacement.substring(position, position + maxDigits - 1), 10);
+                    }
+                    if (!isNaN(index)) {
+                        if (regexMatch.groups.length > 0) {
+                            var submatch = regexMatch.groups[index - 1];
+                            if (typeof submatch !== "undefined") {
+                                substitute += submatch;
+                            }
+                        }
+                        position += index.toString().length;
+                    } else {
+                        // not a capture group, treat the $ as literal
+                        substitute += "$";
+                    }
+                }
+                index = replacement.indexOf("$", position);
+            }
+            substitute += replacement.substring(position);
+            return substitute;
+        };
+    } else {
+        replacer = replacement;
+    }
+
+    var result = "";
+    var position = 0;
+
+    if (typeof limit === "undefined" || limit > 0) {
+        var count = 0;
+        if (typeof pattern === "string") {
+            var index = str.indexOf(pattern, position);
+            while (index !== -1 && (typeof limit === "undefined" || count < limit)) {
+                result += str.substring(position, index);
+                result += replacement;
+                position = index + pattern.length;
+                count++;
+                index = str.indexOf(pattern, position);
+            }
+            result += str.substring(position);
+        } else {
+            var matches = pattern(str);
+            if (typeof matches !== "undefined") {
+                while (typeof matches !== "undefined" && (typeof limit === "undefined" || count < limit)) {
+                    result += str.substring(position, matches.start);
+                    var replacedWith = yield* apply(replacer, [matches], null);
+                    // check replacedWith is a string
+                    if (typeof replacedWith === "string") {
+                        result += replacedWith;
+                    } else {
+                        // not a string - throw error
+                        throw {
+                            code: "D3012",
+                            stack: new Error().stack,
+                            value: replacedWith,
+                        };
+                    }
+                    position = matches.start + matches.match.length;
+                    count++;
+                    matches = matches.next();
+                }
+                result += str.substring(position);
+            } else {
+                result = str;
+            }
+        }
+    } else {
+        result = str;
+    }
+
+    return result;
+}
+
+/**
+ * Base64 encode a string
+ * @param {String} str - string
+ * @returns {String} Base 64 encoding of the binary data
+ */
+export function functionBase64encode(str) {
+    // undefined inputs always return undefined
+    if (typeof str === "undefined") {
+        return undefined;
+    }
+    // Use btoa in a browser, or Buffer in Node.js
+    /* istanbul ignore next */
+    if (typeof window !== "undefined") {
+        return window.btoa(str);
+    } else {
+        return new global.Buffer(str, "binary").toString("base64");
+    }
+}
+
+/**
+ * Base64 decode a string
+ * @param {String} str - string
+ * @returns {String} Base 64 encoding of the binary data
+ */
+export function functionBase64decode(str) {
+    // undefined inputs always return undefined
+    if (typeof str === "undefined") {
+        return undefined;
+    }
+    // Use btoa in a browser, or Buffer in Node.js
+    /* istanbul ignore next */
+    if (typeof window !== "undefined") {
+        return window.atob(str);
+    } else {
+        return new global.Buffer(str, "base64").toString("binary");
+    }
+}
+
+/**
+ * Split a string into an array of substrings
+ * @param {String} str - string
+ * @param {String} separator - the token or regex that splits the string
+ * @param {Integer} [limit] - max number of substrings
+ * @returns {Array} The array of string
+ */
+export function functionSplit(str, separator, limit) {
+    // undefined inputs always return undefined
+    if (typeof str === "undefined") {
+        return undefined;
+    }
+
+    // limit, if specified, must be a non-negative number
+    if (limit < 0) {
+        throw {
+            code: "D3020",
+            stack: new Error().stack,
+            value: limit,
+            index: 3,
+        };
+    }
+
+    var result = [];
+
+    if (typeof limit === "undefined" || limit > 0) {
+        if (typeof separator === "string") {
+            result = str.split(separator, limit);
+        } else {
+            var count = 0;
+            var matches = separator(str);
+            if (typeof matches !== "undefined") {
+                var start = 0;
+                while (typeof matches !== "undefined" && (typeof limit === "undefined" || count < limit)) {
+                    result.push(str.substring(start, matches.start));
+                    start = matches.end;
+                    matches = matches.next();
+                    count++;
+                }
+                if (typeof limit === "undefined" || count < limit) {
+                    result.push(str.substring(start));
+                }
+            } else {
+                result.push(str);
+            }
+        }
+    }
+
+    return result;
+}
+
+/**
+ * Join an array of strings
+ * @param {Array} strs - array of string
+ * @param {String} [separator] - the token that splits the string
+ * @returns {String} The concatenated string
+ */
+export function functionJoin(strs, separator) {
+    // undefined inputs always return undefined
+    if (typeof strs === "undefined") {
+        return undefined;
+    }
+
+    // if separator is not specified, default to empty string
+    if (typeof separator === "undefined") {
+        separator = "";
+    }
+
+    return strs.join(separator);
+}
+
+/**
+ * Formats a number into a decimal string representation using XPath 3.1 F&O fn:format-number spec
+ * @param {number} value - number to format
+ * @param {String} picture - picture string definition
+ * @param {Object} [options] - override locale defaults
+ * @returns {String} The formatted string
+ */
+export function functionFormatNumber(value, picture, options) {
+    var defaults = {
+        "decimal-separator": ".",
+        "grouping-separator": ",",
+        "exponent-separator": "e",
+        infinity: "Infinity",
+        "minus-sign": "-",
+        NaN: "NaN",
+        percent: "%",
+        "per-mille": "\u2030",
+        "zero-digit": "0",
+        digit: "#",
+        "pattern-separator": ";",
+    };
+
+    // if `options` is specified, then its entries override defaults
+    var properties = defaults;
+    if (typeof options !== "undefined") {
+        Object.keys(options).forEach(function(key) {
+            properties[key] = options[key];
+        });
+    }
+
+    var decimalDigitFamily = [];
+    var zeroCharCode = properties["zero-digit"].charCodeAt(0);
+    for (var ii = zeroCharCode; ii < zeroCharCode + 10; ii++) {
+        decimalDigitFamily.push(String.fromCharCode(ii));
+    }
+
+    var activeChars = decimalDigitFamily.concat([
+        properties["decimal-separator"],
+        properties["exponent-separator"],
+        properties["grouping-separator"],
+        properties.digit,
+        properties["pattern-separator"],
+    ]);
+
+    var subPictures = picture.split(properties["pattern-separator"]);
+
+    if (subPictures.length > 2) {
+        throw {
+            code: "D3080",
+            stack: new Error().stack,
+        };
+    }
+
+    var splitParts = function(subpicture) {
+        var prefix = (function() {
+            var ch;
+            for (var ii = 0; ii < subpicture.length; ii++) {
+                ch = subpicture.charAt(ii);
+                if (activeChars.indexOf(ch) !== -1 && ch !== properties["exponent-separator"]) {
+                    return subpicture.substring(0, ii);
+                }
+            }
+        })();
+        var suffix = (function() {
+            var ch;
+            for (var ii = subpicture.length - 1; ii >= 0; ii--) {
+                ch = subpicture.charAt(ii);
+                if (activeChars.indexOf(ch) !== -1 && ch !== properties["exponent-separator"]) {
+                    return subpicture.substring(ii + 1);
+                }
+            }
+        })();
+        var activePart = subpicture.substring(prefix.length, subpicture.length - suffix.length);
+        var mantissaPart, exponentPart, integerPart, fractionalPart;
+        var exponentPosition = subpicture.indexOf(properties["exponent-separator"], prefix.length);
+        if (exponentPosition === -1 || exponentPosition > subpicture.length - suffix.length) {
+            mantissaPart = activePart;
+            exponentPart = undefined;
+        } else {
+            mantissaPart = activePart.substring(0, exponentPosition);
+            exponentPart = activePart.substring(exponentPosition + 1);
+        }
+        var decimalPosition = mantissaPart.indexOf(properties["decimal-separator"]);
+        if (decimalPosition === -1) {
+            integerPart = mantissaPart;
+            fractionalPart = suffix;
+        } else {
+            integerPart = mantissaPart.substring(0, decimalPosition);
+            fractionalPart = mantissaPart.substring(decimalPosition + 1);
+        }
+        return {
+            prefix: prefix,
+            suffix: suffix,
+            activePart: activePart,
+            mantissaPart: mantissaPart,
+            exponentPart: exponentPart,
+            integerPart: integerPart,
+            fractionalPart: fractionalPart,
+            subpicture: subpicture,
+        };
+    };
+
+    // validate the picture string, F&O 4.7.3
+    var validate = function(parts) {
+        var error;
+        var ii;
+        var subpicture = parts.subpicture;
+        var decimalPos = subpicture.indexOf(properties["decimal-separator"]);
+        if (decimalPos !== subpicture.lastIndexOf(properties["decimal-separator"])) {
+            error = "D3081";
+        }
+        if (subpicture.indexOf(properties.percent) !== subpicture.lastIndexOf(properties.percent)) {
+            error = "D3082";
+        }
+        if (subpicture.indexOf(properties["per-mille"]) !== subpicture.lastIndexOf(properties["per-mille"])) {
+            error = "D3083";
+        }
+        if (subpicture.indexOf(properties.percent) !== -1 && subpicture.indexOf(properties["per-mille"]) !== -1) {
+            error = "D3084";
+        }
+        var valid = false;
+        for (ii = 0; ii < parts.mantissaPart.length; ii++) {
+            var ch = parts.mantissaPart.charAt(ii);
+            if (decimalDigitFamily.indexOf(ch) !== -1 || ch === properties.digit) {
+                valid = true;
+                break;
+            }
+        }
+        if (!valid) {
+            error = "D3085";
+        }
+        var charTypes = parts.activePart
+            .split("")
+            .map(function(char) {
+                return activeChars.indexOf(char) === -1 ? "p" : "a";
+            })
+            .join("");
+        if (charTypes.indexOf("p") !== -1) {
+            error = "D3086";
+        }
+        if (decimalPos !== -1) {
+            if (
+                subpicture.charAt(decimalPos - 1) === properties["grouping-separator"] ||
+                subpicture.charAt(decimalPos + 1) === properties["grouping-separator"]
+            ) {
+                error = "D3087";
+            }
+        } else if (parts.integerPart.charAt(parts.integerPart.length - 1) === properties["grouping-separator"]) {
+            error = "D3088";
+        }
+        if (subpicture.indexOf(properties["grouping-separator"] + properties["grouping-separator"]) !== -1) {
+            error = "D3089";
+        }
+        var optionalDigitPos = parts.integerPart.indexOf(properties.digit);
+        if (
+            optionalDigitPos !== -1 &&
+            parts.integerPart
+                .substring(0, optionalDigitPos)
+                .split("")
+                .filter(function(char) {
+                    return decimalDigitFamily.indexOf(char) > -1;
+                }).length > 0
+        ) {
+            error = "D3090";
+        }
+        optionalDigitPos = parts.fractionalPart.lastIndexOf(properties.digit);
+        if (
+            optionalDigitPos !== -1 &&
+            parts.fractionalPart
+                .substring(optionalDigitPos)
+                .split("")
+                .filter(function(char) {
+                    return decimalDigitFamily.indexOf(char) > -1;
+                }).length > 0
+        ) {
+            error = "D3091";
+        }
+        var exponentExists = typeof parts.exponentPart === "string";
+        if (
+            exponentExists &&
+            parts.exponentPart.length > 0 &&
+            (subpicture.indexOf(properties.percent) !== -1 || subpicture.indexOf(properties["per-mille"]) !== -1)
+        ) {
+            error = "D3092";
+        }
+        if (
+            exponentExists &&
+            (parts.exponentPart.length === 0 ||
+                parts.exponentPart.split("").filter(function(char) {
+                    return decimalDigitFamily.indexOf(char) === -1;
+                }).length > 0)
+        ) {
+            error = "D3093";
+        }
+        if (error) {
+            throw {
+                code: error,
+                stack: new Error().stack,
+            };
+        }
+    };
+
+    // analyse the picture string, F&O 4.7.4
+    var analyse = function(parts) {
+        var getGroupingPositions = function(part, toLeft?) {
+            var positions = [];
+            var groupingPosition = part.indexOf(properties["grouping-separator"]);
+            while (groupingPosition !== -1) {
+                var charsToTheRight = (toLeft ? part.substring(0, groupingPosition) : part.substring(groupingPosition))
+                    .split("")
+                    .filter(function(char) {
+                        return decimalDigitFamily.indexOf(char) !== -1 || char === properties.digit;
+                    }).length;
+                positions.push(charsToTheRight);
+                groupingPosition = parts.integerPart.indexOf(properties["grouping-separator"], groupingPosition + 1);
+            }
+            return positions;
+        };
+        var integerPartGroupingPositions = getGroupingPositions(parts.integerPart);
+        var regular = function(indexes) {
+            // are the grouping positions regular? i.e. same interval between each of them
+            if (indexes.length === 0) {
+                return 0;
+            }
+            var gcd = function(a, b) {
+                return b === 0 ? a : gcd(b, a % b);
+            };
+            // find the greatest common divisor of all the positions
+            var factor = indexes.reduce(gcd);
+            // is every position separated by this divisor? If so, it's regular
+            for (var index = 1; index <= indexes.length; index++) {
+                if (indexes.indexOf(index * factor) === -1) {
+                    return 0;
+                }
+            }
+            return factor;
+        };
+
+        var regularGrouping = regular(integerPartGroupingPositions);
+        var fractionalPartGroupingPositions = getGroupingPositions(parts.fractionalPart, true);
+
+        var minimumIntegerPartSize = parts.integerPart.split("").filter(function(char) {
+            return decimalDigitFamily.indexOf(char) !== -1;
+        }).length;
+        var scalingFactor = minimumIntegerPartSize;
+
+        var fractionalPartArray = parts.fractionalPart.split("");
+        var minimumFactionalPartSize = fractionalPartArray.filter(function(char) {
+            return decimalDigitFamily.indexOf(char) !== -1;
+        }).length;
+        var maximumFactionalPartSize = fractionalPartArray.filter(function(char) {
+            return decimalDigitFamily.indexOf(char) !== -1 || char === properties.digit;
+        }).length;
+        var exponentPresent = typeof parts.exponentPart === "string";
+        if (minimumIntegerPartSize === 0 && maximumFactionalPartSize === 0) {
+            if (exponentPresent) {
+                minimumFactionalPartSize = 1;
+                maximumFactionalPartSize = 1;
+            } else {
+                minimumIntegerPartSize = 1;
+            }
+        }
+        if (exponentPresent && minimumIntegerPartSize === 0 && parts.integerPart.indexOf(properties.digit) !== -1) {
+            minimumIntegerPartSize = 1;
+        }
+        if (minimumIntegerPartSize === 0 && minimumFactionalPartSize === 0) {
+            minimumFactionalPartSize = 1;
+        }
+        var minimumExponentSize = 0;
+        if (exponentPresent) {
+            minimumExponentSize = parts.exponentPart.split("").filter(function(char) {
+                return decimalDigitFamily.indexOf(char) !== -1;
+            }).length;
+        }
+
+        return {
+            integerPartGroupingPositions: integerPartGroupingPositions,
+            regularGrouping: regularGrouping,
+            minimumIntegerPartSize: minimumIntegerPartSize,
+            scalingFactor: scalingFactor,
+            prefix: parts.prefix,
+            fractionalPartGroupingPositions: fractionalPartGroupingPositions,
+            minimumFactionalPartSize: minimumFactionalPartSize,
+            maximumFactionalPartSize: maximumFactionalPartSize,
+            minimumExponentSize: minimumExponentSize,
+            suffix: parts.suffix,
+            picture: parts.subpicture,
+        };
+    };
+
+    var parts = subPictures.map(splitParts);
+    parts.forEach(validate);
+
+    var variables = parts.map(analyse);
+
+    if (variables.length === 1) {
+        variables.push(JSON.parse(JSON.stringify(variables[0])));
+        variables[1].prefix = properties["minus-sign"] + variables[1].prefix;
+    }
+
+    // TODO cache the result of the analysis
+
+    // format the number
+    // bullet 1: TODO: NaN - not sure we'd ever get this in JSON
+    var pic;
+    // bullet 2:
+    if (value >= 0) {
+        pic = variables[0];
+    } else {
+        pic = variables[1];
+    }
+    var adjustedNumber;
+    // bullet 3:
+    if (pic.picture.indexOf(properties.percent) !== -1) {
+        adjustedNumber = value * 100;
+    } else if (pic.picture.indexOf(properties["per-mille"]) !== -1) {
+        adjustedNumber = value * 1000;
+    } else {
+        adjustedNumber = value;
+    }
+    // bullet 4:
+    // TODO: infinity - not sure we'd ever get this in JSON
+    // bullet 5:
+    var mantissa, exponent;
+    if (pic.minimumExponentSize === 0) {
+        mantissa = adjustedNumber;
+    } else {
+        // mantissa * 10^exponent = adjustedNumber
+        var maxMantissa = Math.pow(10, pic.scalingFactor);
+        var minMantissa = Math.pow(10, pic.scalingFactor - 1);
+        mantissa = adjustedNumber;
+        exponent = 0;
+        while (mantissa < minMantissa) {
+            mantissa *= 10;
+            exponent -= 1;
+        }
+        while (mantissa > maxMantissa) {
+            mantissa /= 10;
+            exponent += 1;
+        }
+    }
+    // bullet 6:
+    var roundedNumber = functionRound(mantissa, pic.maximumFactionalPartSize);
+    // bullet 7:
+    var makeString = function(value, dp) {
+        var str = Math.abs(value).toFixed(dp);
+        if (properties["zero-digit"] !== "0") {
+            str = str
+                .split("")
+                .map(function(digit) {
+                    if (digit >= "0" && digit <= "9") {
+                        return decimalDigitFamily[digit.charCodeAt(0) - 48];
+                    } else {
+                        return digit;
+                    }
+                })
+                .join("");
+        }
+        return str;
+    };
+    var stringValue = makeString(roundedNumber, pic.maximumFactionalPartSize);
+    var decimalPos = stringValue.indexOf(".");
+    if (decimalPos === -1) {
+        stringValue = stringValue + properties["decimal-separator"];
+    } else {
+        stringValue = stringValue.replace(".", properties["decimal-separator"]);
+    }
+    while (stringValue.charAt(0) === properties["zero-digit"]) {
+        stringValue = stringValue.substring(1);
+    }
+    while (stringValue.charAt(stringValue.length - 1) === properties["zero-digit"]) {
+        stringValue = stringValue.substring(0, stringValue.length - 1);
+    }
+    // bullets 8 & 9:
+    decimalPos = stringValue.indexOf(properties["decimal-separator"]);
+    var padLeft = pic.minimumIntegerPartSize - decimalPos;
+    var padRight = pic.minimumFactionalPartSize - (stringValue.length - decimalPos - 1);
+    stringValue = (padLeft > 0 ? new Array(padLeft + 1).join("0") : "") + stringValue;
+    stringValue = stringValue + (padRight > 0 ? new Array(padRight + 1).join("0") : "");
+    decimalPos = stringValue.indexOf(properties["decimal-separator"]);
+    // bullet 10:
+    if (pic.regularGrouping > 0) {
+        var groupCount = Math.floor((decimalPos - 1) / pic.regularGrouping);
+        for (var group = 1; group <= groupCount; group++) {
+            stringValue = [
+                stringValue.slice(0, decimalPos - group * pic.regularGrouping),
+                properties["grouping-separator"],
+                stringValue.slice(decimalPos - group * pic.regularGrouping),
+            ].join("");
+        }
+    } else {
+        pic.integerPartGroupingPositions.forEach(function(pos) {
+            stringValue = [
+                stringValue.slice(0, decimalPos - pos),
+                properties["grouping-separator"],
+                stringValue.slice(decimalPos - pos),
+            ].join("");
+            decimalPos++;
+        });
+    }
+    // bullet 11:
+    decimalPos = stringValue.indexOf(properties["decimal-separator"]);
+    pic.fractionalPartGroupingPositions.forEach(function(pos) {
+        stringValue = [
+            stringValue.slice(0, pos + decimalPos + 1),
+            properties["grouping-separator"],
+            stringValue.slice(pos + decimalPos + 1),
+        ].join("");
+    });
+    // bullet 12:
+    decimalPos = stringValue.indexOf(properties["decimal-separator"]);
+    if (pic.picture.indexOf(properties["decimal-separator"]) === -1 || decimalPos === stringValue.length - 1) {
+        stringValue = stringValue.substring(0, stringValue.length - 1);
+    }
+    // bullet 13:
+    if (typeof exponent !== "undefined") {
+        var stringExponent = makeString(exponent, 0);
+        padLeft = pic.minimumExponentSize - stringExponent.length;
+        if (padLeft > 0) {
+            stringExponent = new Array(padLeft + 1).join("0") + stringExponent;
+        }
+        stringValue =
+            stringValue +
+            properties["exponent-separator"] +
+            (exponent < 0 ? properties["minus-sign"] : "") +
+            stringExponent;
+    }
+    // bullet 14:
+    stringValue = pic.prefix + stringValue + pic.suffix;
+    return stringValue;
+}
+
+/**
+ * Converts a number to a string using a specified number base
+ * @param {string} value - the number to convert
+ * @param {number} [radix] - the number base; must be between 2 and 36. Defaults to 10
+ * @returns {string} - the converted string
+ */
+export function functionFormatBase(value, radix) {
+    // undefined inputs always return undefined
+    if (typeof value === "undefined") {
+        return undefined;
+    }
+
+    value = functionRound(value);
+
+    if (typeof radix === "undefined") {
+        radix = 10;
+    } else {
+        radix = functionRound(radix);
+    }
+
+    if (radix < 2 || radix > 36) {
+        throw {
+            code: "D3100",
+            stack: new Error().stack,
+            value: radix,
+        };
+    }
+
+    var result = value.toString(radix);
+
+    return result;
+}
+
+/**
+ * Cast argument to number
+ * @param {Object} arg - Argument
+ * @returns {Number} numeric value of argument
+ */
+export function functionNumber(arg) {
+    var result;
+
+    // undefined inputs always return undefined
+    if (typeof arg === "undefined") {
+        return undefined;
+    }
+
+    if (typeof arg === "number") {
+        // already a number
+        result = arg;
+    } else if (
+        typeof arg === "string" &&
+        /^-?(0|([1-9][0-9]*))(\.[0-9]+)?([Ee][-+]?[0-9]+)?$/.test(arg) &&
+        !isNaN(parseFloat(arg)) &&
+        isFinite(parseFloat(arg))
+    ) {
+        result = parseFloat(arg);
+    } else {
+        throw {
+            code: "D3030",
+            value: arg,
+            stack: new Error().stack,
+            index: 1,
+        };
+    }
+    return result;
+}
+
+/**
+ * Absolute value of a number
+ * @param {Number} arg - Argument
+ * @returns {Number} absolute value of argument
+ */
+export function functionAbs(arg) {
+    var result;
+
+    // undefined inputs always return undefined
+    if (typeof arg === "undefined") {
+        return undefined;
+    }
+
+    result = Math.abs(arg);
+    return result;
+}
+
+/**
+ * Rounds a number down to integer
+ * @param {Number} arg - Argument
+ * @returns {Number} rounded integer
+ */
+export function functionFloor(arg) {
+    var result;
+
+    // undefined inputs always return undefined
+    if (typeof arg === "undefined") {
+        return undefined;
+    }
+
+    result = Math.floor(arg);
+    return result;
+}
+
+/**
+ * Rounds a number up to integer
+ * @param {Number} arg - Argument
+ * @returns {Number} rounded integer
+ */
+export function functionCeil(arg) {
+    var result;
+
+    // undefined inputs always return undefined
+    if (typeof arg === "undefined") {
+        return undefined;
+    }
+
+    result = Math.ceil(arg);
+    return result;
+}
+
+/**
+ * Round to half even
+ * @param {Number} arg - Argument
+ * @param {Number} precision - number of decimal places
+ * @returns {Number} rounded integer
+ */
+export function functionRound(arg, precision?) {
+    var result;
+
+    // undefined inputs always return undefined
+    if (typeof arg === "undefined") {
+        return undefined;
+    }
+
+    if (precision) {
+        // shift the decimal place - this needs to be done in a string since multiplying
+        // by a power of ten can introduce floating point precision errors which mess up
+        // this rounding algorithm - See 'Decimal rounding' in
+        // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/round
+        // Shift
+        var value = arg.toString().split("e");
+        arg = +(value[0] + "e" + (value[1] ? +value[1] + precision : precision));
+    }
+
+    // round up to nearest int
+    result = Math.round(arg);
+    var diff = result - arg;
+    if (Math.abs(diff) === 0.5 && Math.abs(result % 2) === 1) {
+        // rounded the wrong way - adjust to nearest even number
+        result = result - 1;
+    }
+    if (precision) {
+        // Shift back
+        value = result.toString().split("e");
+        /* istanbul ignore next */
+        result = +(value[0] + "e" + (value[1] ? +value[1] - precision : -precision));
+    }
+    if (Object.is(result, -0)) {
+        // ESLint rule 'no-compare-neg-zero' suggests this way
+        // JSON doesn't do -0
+        result = 0;
+    }
+    return result;
+}
+
+/**
+ * Square root of number
+ * @param {Number} arg - Argument
+ * @returns {Number} square root
+ */
+export function functionSqrt(arg) {
+    var result;
+
+    // undefined inputs always return undefined
+    if (typeof arg === "undefined") {
+        return undefined;
+    }
+
+    if (arg < 0) {
+        throw {
+            stack: new Error().stack,
+            code: "D3060",
+            index: 1,
+            value: arg,
+        };
+    }
+
+    result = Math.sqrt(arg);
+
+    return result;
+}
+
+/**
+ * Raises number to the power of the second number
+ * @param {Number} arg - the base
+ * @param {Number} exp - the exponent
+ * @returns {Number} rounded integer
+ */
+export function functionPower(arg, exp) {
+    var result;
+
+    // undefined inputs always return undefined
+    if (typeof arg === "undefined") {
+        return undefined;
+    }
+
+    result = Math.pow(arg, exp);
+
+    if (!isFinite(result)) {
+        throw {
+            stack: new Error().stack,
+            code: "D3061",
+            index: 1,
+            value: arg,
+            exp: exp,
+        };
+    }
+
+    return result;
+}
+
+/**
+ * Returns a random number 0 <= n < 1
+ * @returns {number} random number
+ */
+export function functionRandom() {
+    return Math.random();
+}
+
+/**
+ * Evaluate an input and return a boolean
+ * @param {*} arg - Arguments
+ * @returns {boolean} Boolean
+ */
+export function functionBoolean(arg) {
+    // cast arg to its effective boolean value
+    // boolean: unchanged
+    // string: zero-length -> false; otherwise -> true
+    // number: 0 -> false; otherwise -> true
+    // null -> false
+    // array: empty -> false; length > 1 -> true
+    // object: empty -> false; non-empty -> true
+    // function -> false
+
+    // undefined inputs always return undefined
+    if (typeof arg === "undefined") {
+        return undefined;
+    }
+
+    var result = false;
+    if (Array.isArray(arg)) {
+        if (arg.length === 1) {
+            result = functionBoolean(arg[0]);
+        } else if (arg.length > 1) {
+            var trues = arg.filter(function(val) {
+                return functionBoolean(val);
+            });
+            result = trues.length > 0;
+        }
+    } else if (typeof arg === "string") {
+        if (arg.length > 0) {
+            result = true;
+        }
+    } else if (isNumeric(arg)) {
+        if (arg !== 0) {
+            result = true;
+        }
+    } else if (arg !== null && typeof arg === "object") {
+        if (Object.keys(arg).length > 0) {
+            // make sure it's not a lambda function
+            if (!(isLambda(arg) || arg._jsonata_function)) {
+                result = true;
+            }
+        }
+    } else if (typeof arg === "boolean" && arg === true) {
+        result = true;
+    }
+    return result;
+}
+
+/**
+ * returns the Boolean NOT of the arg
+ * @param {*} arg - argument
+ * @returns {boolean} - NOT arg
+ */
+export function functionNot(arg) {
+    return !functionBoolean(arg);
+}
+
+/**
+ * Create a map from an array of arguments
+ * @param {Array} [arr] - array to map over
+ * @param {Function} func - function to apply
+ * @returns {Array} Map array
+ */
+function* functionMap(arr, func) {
+    // undefined inputs always return undefined
+    if (typeof arr === "undefined") {
+        return undefined;
+    }
+
+    var result = createSequence();
+    // do the map - iterate over the arrays, and invoke func
+    for (var i = 0; i < arr.length; i++) {
+        var func_args = [arr[i]]; // the first arg (value) is required
+        // the other two are optional - only supply it if the function can take it
+        var length =
+            typeof func === "function"
+                ? func.length
+                : func._jsonata_function === true ? func.implementation.length : func.arguments.length;
+        if (length >= 2) {
+            func_args.push(i);
+        }
+        if (length >= 3) {
+            func_args.push(arr);
+        }
+        // invoke func
+        var res = yield* apply(func, func_args, null);
+        if (typeof res !== "undefined") {
+            result.push(res);
+        }
+    }
+
+    return result;
+}
+
+// This generator function does not have a yield(), presumably to make it
+// consistent with other similar functions.
+/**
+ * Create a map from an array of arguments
+ * @param {Array} [arr] - array to filter
+ * @param {Function} func - predicate function
+ * @returns {Array} Map array
+ */
+function* functionFilter(arr, func) {
+    // eslint-disable-line require-yield
+    // undefined inputs always return undefined
+    if (typeof arr === "undefined") {
+        return undefined;
+    }
+
+    var result = createSequence();
+
+    var predicate = function(value, index, array) {
+        var it = apply(func, [value, index, array], null);
+        // returns a generator - so iterate over it
+        var res = it.next();
+        while (!res.done) {
+            res = it.next(res.value);
+        }
+        return res.value;
+    };
+
+    for (var i = 0; i < arr.length; i++) {
+        var entry = arr[i];
+        if (functionBoolean(predicate(entry, i, arr))) {
+            result.push(entry);
+        }
+    }
+
+    return result;
+}
+
+/**
+ * Convolves (zips) each value from a set of arrays
+ * @param {Array} [args] - arrays to zip
+ * @returns {Array} Zipped array
+ */
+export function functionZip() {
+    // this can take a variable number of arguments
+    var result = [];
+    var args = Array.prototype.slice.call(arguments);
+    // length of the shortest array
+    var length = Math.min.apply(
+        Math,
+        args.map(function(arg) {
+            if (Array.isArray(arg)) {
+                return arg.length;
+            }
+            return 0;
+        }),
+    );
+    for (var i = 0; i < length; i++) {
+        var tuple = args.map(arg => {
+            return arg[i];
+        });
+        result.push(tuple);
+    }
+    return result;
+}
+
+/**
+ * Fold left function
+ * @param {Array} sequence - Sequence
+ * @param {Function} func - Function
+ * @param {Object} init - Initial value
+ * @returns {*} Result
+ */
+function* functionFoldLeft(sequence, func, init) {
+    // undefined inputs always return undefined
+    if (typeof sequence === "undefined") {
+        return undefined;
+    }
+
+    var result;
+
+    if (
+        !(
+            func.length === 2 ||
+            (func._jsonata_function === true && func.implementation.length === 2) ||
+            func.arguments.length === 2
+        )
+    ) {
+        throw {
+            stack: new Error().stack,
+            code: "D3050",
+            index: 1,
+        };
+    }
+
+    var index;
+    if (typeof init === "undefined" && sequence.length > 0) {
+        result = sequence[0];
+        index = 1;
+    } else {
+        result = init;
+        index = 0;
+    }
+
+    while (index < sequence.length) {
+        result = yield* apply(func, [result, sequence[index]], null);
+        index++;
+    }
+
+    return result;
+}
+
+/**
+ * Return keys for an object
+ * @param {Object} arg - Object
+ * @returns {Array} Array of keys
+ */
+export function functionKeys(arg) {
+    var result = createSequence();
+
+    if (Array.isArray(arg)) {
+        // merge the keys of all of the items in the array
+        var merge = {};
+        arg.forEach(function(item) {
+            var keys = functionKeys(item);
+            if (Array.isArray(keys)) {
+                keys.forEach(function(key) {
+                    merge[key] = true;
+                });
+            }
+        });
+        result = functionKeys(merge);
+    } else if (arg !== null && typeof arg === "object" && !isLambda(arg)) {
+        result = Object.keys(arg);
+        if (result.length === 0) {
+            result = undefined;
+        }
+    } else {
+        result = undefined;
+    }
+    return result;
+}
+
+/**
+ * Return value from an object for a given key
+ * @param {Object} object - Object
+ * @param {String} key - Key in object
+ * @returns {*} Value of key in object
+ */
+export function functionLookup(object, key) {
+    var result = evaluateName({ value: key }, object, {});
+    return result;
+}
+
+/**
+ * Append second argument to first
+ * @param {Array|Object} arg1 - First argument
+ * @param {Array|Object} arg2 - Second argument
+ * @returns {*} Appended arguments
+ */
+export function functionAppend(arg1, arg2) {
+    // disregard undefined args
+    if (typeof arg1 === "undefined") {
+        return arg2;
+    }
+    if (typeof arg2 === "undefined") {
+        return arg1;
+    }
+    // if either argument is not an array, make it so
+    if (!Array.isArray(arg1)) {
+        arg1 = createSequence(arg1);
+    }
+    if (!Array.isArray(arg2)) {
+        arg2 = [arg2];
+    }
+    Array.prototype.push.apply(arg1, arg2);
+    return arg1;
+}
+
+/**
+ * Determines if the argument is undefined
+ * @param {*} arg - argument
+ * @returns {boolean} False if argument undefined, otherwise true
+ */
+export function functionExists(arg) {
+    if (typeof arg === "undefined") {
+        return false;
+    } else {
+        return true;
+    }
+}
+
+/**
+ * Splits an object into an array of object with one property each
+ * @param {*} arg - the object to split
+ * @returns {*} - the array
+ */
+export function functionSpread(arg) {
+    var result = createSequence();
+
+    if (Array.isArray(arg)) {
+        // spread all of the items in the array
+        arg.forEach(function(item) {
+            result = functionAppend(result, functionSpread(item));
+        });
+    } else if (arg !== null && typeof arg === "object" && !isLambda(arg)) {
+        for (var key in arg) {
+            var obj = {};
+            obj[key] = arg[key];
+            result.push(obj);
+        }
+    } else {
+        result = arg;
+    }
+    return result;
+}
+
+/**
+ * Merges an array of objects into a single object.  Duplicate properties are
+ * overridden by entries later in the array
+ * @param {*} arg - the objects to merge
+ * @returns {*} - the object
+ */
+export function functionMerge(arg) {
+    // undefined inputs always return undefined
+    if (typeof arg === "undefined") {
+        return undefined;
+    }
+
+    var result = {};
+
+    arg.forEach(function(obj) {
+        for (var prop in obj) {
+            result[prop] = obj[prop];
+        }
+    });
+    return result;
+}
+
+/**
+ * Reverses the order of items in an array
+ * @param {Array} arr - the array to reverse
+ * @returns {Array} - the reversed array
+ */
+export function functionReverse(arr) {
+    // undefined inputs always return undefined
+    if (typeof arr === "undefined") {
+        return undefined;
+    }
+
+    if (arr.length <= 1) {
+        return arr;
+    }
+
+    var length = arr.length;
+    var result = new Array(length);
+    for (var i = 0; i < length; i++) {
+        result[length - i - 1] = arr[i];
+    }
+
+    return result;
+}
+
+/**
+ *
+ * @param {*} obj - the input object to iterate over
+ * @param {*} func - the function to apply to each key/value pair
+ * @returns {Array} - the resultant array
+ */
+function* functionEach(obj, func) {
+    var result = createSequence();
+
+    for (var key in obj) {
+        var func_args = [obj[key], key];
+        // invoke func
+        result.push(yield* apply(func, func_args, null));
+    }
+
+    return result;
+}
+
+/**
+ * Implements the merge sort (stable) with optional comparator function
+ *
+ * @param {Array} arr - the array to sort
+ * @param {*} comparator - comparator function
+ * @returns {Array} - sorted array
+ */
+export function functionSort(arr, comparator) {
+    // undefined inputs always return undefined
+    if (typeof arr === "undefined") {
+        return undefined;
+    }
+
+    if (arr.length <= 1) {
+        return arr;
+    }
+
+    var comp;
+    if (typeof comparator === "undefined") {
+        // inject a default comparator - only works for numeric or string arrays
+        if (!isArrayOfNumbers(arr) && !isArrayOfStrings(arr)) {
+            throw {
+                stack: new Error().stack,
+                code: "D3070",
+                index: 1,
+            };
+        }
+
+        comp = function(a, b) {
+            return a > b;
+        };
+    } else if (typeof comparator === "function") {
+        // for internal usage of functionSort (i.e. order-by syntax)
+        comp = comparator;
+    } else {
+        comp = function(a, b) {
+            var it = apply(comparator, [a, b], null);
+            // returns a generator - so iterate over it
+            var comp = it.next();
+            while (!comp.done) {
+                comp = it.next(comp.value);
+            }
+            return comp.value;
+        };
+    }
+
+    var merge = function(l, r) {
+        var merge_iter = function(result, left, right) {
+            if (left.length === 0) {
+                Array.prototype.push.apply(result, right);
+            } else if (right.length === 0) {
+                Array.prototype.push.apply(result, left);
+            } else if (comp(left[0], right[0])) {
+                // invoke the comparator function
+                // if it returns true - swap left and right
+                result.push(right[0]);
+                merge_iter(result, left, right.slice(1));
+            } else {
+                // otherwise keep the same order
+                result.push(left[0]);
+                merge_iter(result, left.slice(1), right);
+            }
+        };
+        var merged = [];
+        merge_iter(merged, l, r);
+        return merged;
+    };
+
+    var sort = function(array) {
+        if (array.length <= 1) {
+            return array;
+        } else {
+            var middle = Math.floor(array.length / 2);
+            var left = array.slice(0, middle);
+            var right = array.slice(middle);
+            left = sort(left);
+            right = sort(right);
+            return merge(left, right);
+        }
+    };
+
+    var result = sort(arr);
+
+    return result;
+}
+
+/**
+ * Randomly shuffles the contents of an array
+ * @param {Array} arr - the input array
+ * @returns {Array} the shuffled array
+ */
+export function functionShuffle(arr) {
+    // undefined inputs always return undefined
+    if (typeof arr === "undefined") {
+        return undefined;
+    }
+
+    if (arr.length <= 1) {
+        return arr;
+    }
+
+    // shuffle using the 'inside-out' variant of the Fisher-Yates algorithm
+    var result = new Array(arr.length);
+    for (var i = 0; i < arr.length; i++) {
+        var j = Math.floor(Math.random() * (i + 1)); // random integer such that 0 ≤ j ≤ i
+        if (i !== j) {
+            result[i] = result[j];
+        }
+        result[j] = arr[i];
+    }
+
+    return result;
+}
+
+/**
+ * Applies a predicate function to each key/value pair in an object, and returns an object containing
+ * only the key/value pairs that passed the predicate
+ *
+ * @param {object} arg - the object to be sifted
+ * @param {object} func - the predicate function (lambda or native)
+ * @returns {object} - sifted object
+ */
+export function functionSift(arg, func) {
+    var result = {};
+
+    var predicate = function(value, key, object) {
+        var it = apply(func, [value, key, object], null);
+        // returns a generator - so iterate over it
+        var res = it.next();
+        while (!res.done) {
+            res = it.next(res.value);
+        }
+        return res.value;
+    };
+
+    for (var item in arg) {
+        var entry = arg[item];
+        if (functionBoolean(predicate(entry, item, arg))) {
+            result[item] = entry;
+        }
+    }
+
+    // empty objects should be changed to undefined
+    if (Object.keys(result).length === 0) {
+        result = undefined;
+    }
+
+    return result;
+}
+
+// Regular expression to match an ISO 8601 formatted timestamp
+var iso8601regex = new RegExp("^\\d{4}-[01]\\d-[0-3]\\dT[0-2]\\d:[0-5]\\d:[0-5]\\d\\.\\d+([+-][0-2]\\d:[0-5]\\d|Z)$");
+
+/**
+ * Converts an ISO 8601 timestamp to milliseconds since the epoch
+ *
+ * @param {string} timestamp - the ISO 8601 timestamp to be converted
+ * @returns {Number} - milliseconds since the epoch
+ */
+export function functionToMillis(timestamp) {
+    // undefined inputs always return undefined
+    if (typeof timestamp === "undefined") {
+        return undefined;
+    }
+
+    if (!iso8601regex.test(timestamp)) {
+        throw {
+            stack: new Error().stack,
+            code: "D3110",
+            value: timestamp,
+        };
+    }
+
+    return Date.parse(timestamp);
+}
+
+/**
+ * Converts milliseconds since the epoch to an ISO 8601 timestamp
+ * @param {Number} millis - milliseconds since the epoch to be converted
+ * @returns {String} - an ISO 8601 formatted timestamp
+ */
+export function functionFromMillis(millis) {
+    // undefined inputs always return undefined
+    if (typeof millis === "undefined") {
+        return undefined;
+    }
+
+    return new Date(millis).toISOString();
+}
+
+/**
+ * Clones an object
+ * @param {Object} arg - object to clone (deep copy)
+ * @returns {*} - the cloned object
+ */
+export function functionClone(arg) {
+    // undefined inputs always return undefined
+    if (typeof arg === "undefined") {
+        return undefined;
+    }
+
+    return JSON.parse(functionString(arg));
+}
+
+export function createStandardFrame() {
+    const staticFrame = createFrame(null);
+    bindStandardFunctions(staticFrame);
+    return staticFrame;    
+}
+
+export function bindStandardFunctions(frame) {
+        // Function registration
+        frame.bind('sum', defineFunction(functionSum, '<a<n>:n>'));
+        frame.bind('count', defineFunction(functionCount, '<a:n>'));
+        frame.bind('max', defineFunction(functionMax, '<a<n>:n>'));
+        frame.bind('min', defineFunction(functionMin, '<a<n>:n>'));
+        frame.bind('average', defineFunction(functionAverage, '<a<n>:n>'));
+        frame.bind('string', defineFunction(functionString, '<x-:s>'));
+        frame.bind('substring', defineFunction(functionSubstring, '<s-nn?:s>'));
+        frame.bind('substringBefore', defineFunction(functionSubstringBefore, '<s-s:s>'));
+        frame.bind('substringAfter', defineFunction(functionSubstringAfter, '<s-s:s>'));
+        frame.bind('lowercase', defineFunction(functionLowercase, '<s-:s>'));
+        frame.bind('uppercase', defineFunction(functionUppercase, '<s-:s>'));
+        frame.bind('length', defineFunction(functionLength, '<s-:n>'));
+        frame.bind('trim', defineFunction(functionTrim, '<s-:s>'));
+        frame.bind('pad', defineFunction(functionPad, '<s-ns?:s>'));
+        frame.bind('match', defineFunction(functionMatch, '<s-f<s:o>n?:a<o>>'));
+        frame.bind('contains', defineFunction(functionContains, '<s-(sf):b>')); // TODO <s-(sf<s:o>):b>
+        frame.bind('replace', defineFunction(functionReplace, '<s-(sf)(sf)n?:s>')); // TODO <s-(sf<s:o>)(sf<o:s>)n?:s>
+        frame.bind('split', defineFunction(functionSplit, '<s-(sf)n?:a<s>>')); // TODO <s-(sf<s:o>)n?:a<s>>
+        frame.bind('join', defineFunction(functionJoin, '<a<s>s?:s>'));
+        frame.bind('formatNumber', defineFunction(functionFormatNumber, '<n-so?:s>'));
+        frame.bind('formatBase', defineFunction(functionFormatBase, '<n-n?:s>'));
+        frame.bind('number', defineFunction(functionNumber, '<(ns)-:n>'));
+        frame.bind('floor', defineFunction(functionFloor, '<n-:n>'));
+        frame.bind('ceil', defineFunction(functionCeil, '<n-:n>'));
+        frame.bind('round', defineFunction(functionRound, '<n-n?:n>'));
+        frame.bind('abs', defineFunction(functionAbs, '<n-:n>'));
+        frame.bind('sqrt', defineFunction(functionSqrt, '<n-:n>'));
+        frame.bind('power', defineFunction(functionPower, '<n-n:n>'));
+        frame.bind('random', defineFunction(functionRandom, '<:n>'));
+        frame.bind('boolean', defineFunction(functionBoolean, '<x-:b>'));
+        frame.bind('not', defineFunction(functionNot, '<x-:b>'));
+        frame.bind('map', defineFunction(functionMap, '<af>'));
+        frame.bind('zip', defineFunction(functionZip, '<a+>'));
+        frame.bind('filter', defineFunction(functionFilter, '<af>'));
+        frame.bind('reduce', defineFunction(functionFoldLeft, '<afj?:j>')); // TODO <f<jj:j>a<j>j?:j>
+        frame.bind('sift', defineFunction(functionSift, '<o-f?:o>'));
+        frame.bind('keys', defineFunction(functionKeys, '<x-:a<s>>'));
+        frame.bind('lookup', defineFunction(functionLookup, '<x-s:x>'));
+        frame.bind('append', defineFunction(functionAppend, '<xx:a>'));
+        frame.bind('exists', defineFunction(functionExists, '<x:b>'));
+        frame.bind('spread', defineFunction(functionSpread, '<x-:a<o>>'));
+        frame.bind('merge', defineFunction(functionMerge, '<a<o>:o>'));
+        frame.bind('reverse', defineFunction(functionReverse, '<a:a>'));
+        frame.bind('each', defineFunction(functionEach, '<o-f:a>'));
+        frame.bind('sort', defineFunction(functionSort, '<af?:a>'));
+        frame.bind('shuffle', defineFunction(functionShuffle, '<a:a>'));
+        frame.bind('base64encode', defineFunction(functionBase64encode, '<s-:s>'));
+        frame.bind('base64decode', defineFunction(functionBase64decode, '<s-:s>'));
+        frame.bind('toMillis', defineFunction(functionToMillis, '<s-:n>'));
+        frame.bind('fromMillis', defineFunction(functionFromMillis, '<n-:s>'));
+        frame.bind('clone', defineFunction(functionClone, '<(oa)-:o>'));
+    
+    
+}
\ No newline at end of file
diff --git a/src/index.ts b/src/index.ts
new file mode 100644
index 00000000..462918a2
--- /dev/null
+++ b/src/index.ts
@@ -0,0 +1 @@
+export { jsonata } from './jsonata';
\ No newline at end of file
diff --git a/src/jsonata.ts b/src/jsonata.ts
new file mode 100644
index 00000000..d8210f86
--- /dev/null
+++ b/src/jsonata.ts
@@ -0,0 +1,135 @@
+import { parser } from './parser';
+import { lookupMessage, createFrame } from './utils';
+import { evaluate } from './evaluate';
+import { defineFunction } from './signatures';
+import { createStandardFrame } from './functions';
+import { ASTNode } from './ast';
+
+export interface Options {
+    recover: boolean;
+}
+
+export type Callback = (err: Error, result: any) => void;
+
+export interface Expression {
+    evaluate: (input?: any, bindings?: { [name: string]: any }, callback?: Callback) => any;
+    assign: (key: string, value: any) => void;
+    registerFunction: (name: string, implementation: Function, signature?: string) => void;
+    ast: () => AST;
+    errors: () => string[];
+}
+
+export type AST = any;
+
+/**
+ * JSONata
+ * @param {Object} expr - JSONata expression
+ * @param {boolean} options - recover: attempt to recover on parse error
+ * @returns {{evaluate: evaluate, assign: assign}} Evaluated expression
+ */
+export function jsonata(expr: string, options?: Partial<Options>): Expression {
+    let ast: undefined | ASTNode = undefined;
+    let errors: string[] = [];
+    try {
+        ast = parser(expr, errors, options && options.recover);
+    } catch (err) {
+        // insert error message into structure
+        err.message = lookupMessage(err);
+        throw err;
+    }
+
+    const staticFrame = createStandardFrame();
+    var environment = createFrame(staticFrame);
+
+    var timestamp = new Date(); // will be overridden on each call to evalute()
+    environment.bind(
+        "now",
+        defineFunction(function() {
+            return timestamp.toJSON();
+        }, "<:s>"),
+    );
+    environment.bind(
+        "millis",
+        defineFunction(function() {
+            return timestamp.getTime();
+        }, "<:n>"),
+    );
+
+    return {
+        evaluate: function(input, bindings, callback) {
+            // throw if the expression compiled with syntax errors
+            if (typeof errors !== "undefined" && errors.length>0) {
+                var err: any = {
+                    code: "S0500",
+                    position: 0,
+                };
+                err.message = lookupMessage(err);
+                throw err;
+            }
+
+            if (typeof bindings !== "undefined") {
+                var exec_env;
+                // the variable bindings have been passed in - create a frame to hold these
+                exec_env = createFrame(environment);
+                for (var v in bindings) {
+                    exec_env.bind(v, bindings[v]);
+                }
+            } else {
+                exec_env = environment;
+            }
+            // put the input document into the environment as the root object
+            exec_env.bind("$", input);
+
+            // capture the timestamp and put it in the execution environment
+            // the $now() and $millis() functions will return this value - whenever it is called
+            timestamp = new Date();
+
+            var result, it;
+            // if a callback function is supplied, then drive the generator in a promise chain
+            if (typeof callback === "function") {
+                exec_env.bind("__jsonata_async", true);
+                var thenHandler = function(response) {
+                    result = it.next(response);
+                    if (result.done) {
+                        callback(null, result.value);
+                    } else {
+                        result.value.then(thenHandler).catch(function(err) {
+                            err.message = lookupMessage(err);
+                            callback(err, null);
+                        });
+                    }
+                };
+                it = evaluate(ast, input, exec_env);
+                result = it.next();
+                result.value.then(thenHandler);
+            } else {
+                // no callback function - drive the generator to completion synchronously
+                try {
+                    it = evaluate(ast, input, exec_env);
+                    result = it.next();
+                    while (!result.done) {
+                        result = it.next(result.value);
+                    }
+                    return result.value;
+                } catch (err) {
+                    // insert error message into structure
+                    err.message = lookupMessage(err);
+                    throw err;
+                }
+            }
+        },
+        assign: function(name, value) {
+            environment.bind(name, value);
+        },
+        registerFunction: function(name, implementation, signature) {
+            var func = defineFunction(implementation, signature);
+            environment.bind(name, func);
+        },
+        ast: function() {
+            return ast;
+        },
+        errors: function() {
+            return errors;
+        },
+    };
+}
diff --git a/src/parser/index.ts b/src/parser/index.ts
new file mode 100644
index 00000000..4b92480f
--- /dev/null
+++ b/src/parser/index.ts
@@ -0,0 +1 @@
+export { parser } from './parser';
\ No newline at end of file
diff --git a/src/parser/leds.ts b/src/parser/leds.ts
new file mode 100644
index 00000000..8cd94880
--- /dev/null
+++ b/src/parser/leds.ts
@@ -0,0 +1,209 @@
+import { LED, ParserState } from "./types";
+import { parseSignature } from "../signatures";
+import * as ast from "../ast";
+import { operators } from "../constants";
+
+export const infixDefaultLED = (bindingPower: number): LED => {
+    return (state: ParserState, left: ast.ASTNode): ast.BinaryNode => {
+        let initialToken = state.previousToken;
+        let rhs = state.expression(bindingPower);
+        return {
+            value: initialToken.value,
+            position: initialToken.position,
+            type: "binary",
+            lhs: left,
+            rhs: rhs,
+        };
+    };
+};
+
+export const functionLED: LED = (
+    state: ParserState,
+    left: ast.ASTNode,
+): ast.FunctionInvocationNode | ast.LambdaDefinitionNode => {
+    // left is is what we are trying to invoke
+    let type: "function" | "partial" = "function";
+    let args = [];
+    let initialToken = state.previousToken;
+    if (state.symbol.id !== ")") {
+        for (;;) {
+            if (state.token.type === "operator" && state.symbol.id === "?") {
+                // partial function application
+                type = "partial";
+                args.push({
+                    type: "operator",
+                    position: state.token.position,
+                    value: state.token.value,
+                });
+                state.advance("?");
+            } else {
+                args.push(state.expression(0));
+            }
+            if (state.symbol.id !== ",") break;
+            state.advance(",");
+        }
+    }
+    state.advance(")", true);
+
+    // if the name of the function is 'function' or λ, then this is function definition (lambda function)
+    let isLambda = left.type === "name" && (left.value === "function" || left.value === "\u03BB");
+
+    if (!isLambda) {
+        let alt: ast.FunctionInvocationNode = {
+            position: initialToken.position,
+            value: initialToken.value,
+            type: type,
+            arguments: args,
+            procedure: left,
+        };
+        return alt;
+    }
+    // all of the args must be VARIABLE tokens
+    args.forEach((arg, index) => {
+        if (arg.type !== "variable") {
+            return state.handleError({
+                code: "S0208",
+                stack: new Error().stack,
+                position: arg.position,
+                token: arg.value,
+                value: index + 1,
+            });
+        }
+    });
+    // is the next token a '<' - if so, parse the function signature
+    let signature = undefined;
+    if (state.symbol.id === "<") {
+        var sigPos = state.token.position;
+        var depth = 1;
+        var sig = "<";
+        let id = state.symbol.id;
+        // TODO: Bug in typescript compiler?...doesn't recognize side effects in advance and impact on node value
+        while (depth > 0 && id !== "{" && id !== "(end)") {
+            state.advance();
+            id = state.symbol.id;
+            if (id === ">") {
+                depth--;
+            } else if (id === "<") {
+                depth++;
+            }
+            sig += state.token.value;
+        }
+        state.advance(">");
+        try {
+            signature = parseSignature(sig);
+        } catch (err) {
+            // insert the position into this error
+            err.position = sigPos + err.offset;
+            // TODO: If recover is true, we need to force the return of an
+            // error node here.  In the tests, recover is never set so this
+            // always throws.
+            state.handleError(err);
+            /* istanbul ignore next */
+            throw err;
+        }
+    }
+    // parse the function body
+    state.advance("{");
+    let body = state.expression(0);
+    state.advance("}");
+    return {
+        value: initialToken.value,
+        position: initialToken.position,
+        type: "lambda",
+        body: body,
+        signature: signature,
+        arguments: args,
+        thunk: false,
+    };
+};
+
+export const filterLED: LED = (state: ParserState, left: ast.ASTNode): ast.ASTNode | ast.BinaryNode => {
+    let initialToken = state.previousToken;
+
+    // If the next symbol is a "]", then this is an empty predicate.
+    if (state.symbol.id === "]") {
+        state.advance("]");
+        return {
+            type: "singleton",
+            value: left.value,
+            position: left.position,
+            next: { ...left },
+        }
+    } else {
+        let rhs = state.expression(operators["]"]);
+        state.advance("]", true);
+        let ret: ast.BinaryNode = {
+            value: initialToken.value,
+            position: initialToken.position,
+            type: "binary",
+            lhs: left,
+            rhs: rhs,
+        };
+        return ret;
+    }
+};
+
+export const orderByLED: LED = (state: ParserState, left: ast.ASTNode): ast.SortNode => {
+    let initialToken = state.previousToken;
+    state.advance("(");
+    var terms: ast.SortTerm[] = [];
+    for (;;) {
+        let descending = false;
+        if (state.symbol.id === "<") {
+            // ascending sort
+            descending = false;
+            state.advance("<");
+        } else if (state.symbol.id === ">") {
+            // descending sort
+            descending = true;
+            state.advance(">");
+        } else {
+            descending = false;
+            //unspecified - default to ascending
+        }
+        let term: ast.SortTerm = {
+            descending: descending,
+            expression: state.expression(0),
+        };
+        terms.push(term);
+        if (state.symbol.id !== ",") {
+            break;
+        }
+        state.advance(",");
+    }
+    state.advance(")");
+    return {
+        position: initialToken.position, // REQUIRED?!?
+        value: initialToken.value,
+        type: "sort",
+        lhs: left,
+        rhs: terms,
+    };
+};
+
+export const objectParserLED: LED = (state: ParserState, left: ast.ASTNode): ast.BinaryObjectNode => {
+    var a = [];
+    let initialToken = state.previousToken;
+    /* istanbul ignore else */
+    if (state.symbol.id !== "}") {
+        for (;;) {
+            var n = state.expression(0);
+            state.advance(":");
+            var v = state.expression(0);
+            a.push([n, v]); // holds an array of name/value expression pairs
+            if (state.symbol.id !== ",") {
+                break;
+            }
+            state.advance(",");
+        }
+    }
+    state.advance("}", true);
+    // LED - binary infix form
+    return {
+        value: "{",
+        position: initialToken.position,
+        type: "binary",
+        lhs: left,
+        rhs: a,
+    };
+};
diff --git a/src/parser/nuds.ts b/src/parser/nuds.ts
new file mode 100644
index 00000000..0d4c9438
--- /dev/null
+++ b/src/parser/nuds.ts
@@ -0,0 +1,203 @@
+import { NUD, ParserState } from "./types";
+import { Token } from "../tokenizer";
+import * as ast from "../ast";
+
+export const defaultNUD = (recover: boolean, errors: string[], remainingTokens: () => Token[]): NUD => {
+    return (state: ParserState): ast.ErrorNode => {
+        // error - symbol has been invoked as a unary operator
+        var err: any = {
+            code: "S0211",
+            // TODO: impacts parser-recovery.js (expects previous token)
+            token: state.previousToken.value,
+            position: state.previousToken.position,
+        };
+
+        if (recover) {
+            err.remaining = remainingTokens();
+            err.type = "error";
+            errors.push(err);
+            return err;
+        } else {
+            err.stack = new Error().stack;
+            throw err;
+        }
+    };
+};
+
+export const prefixDefaultNUD = (bindingPower: number): NUD => {
+    return (state: ParserState): ast.UnaryNode => {
+        let initialToken = state.previousToken;
+        let expr = state.expression(bindingPower);
+        return {
+            value: initialToken.value,
+            position: initialToken.position,
+            type: "unary",
+            expression: expr,
+        };
+    };
+};
+
+export const terminalNUD: NUD = (state: ParserState): ast.TerminalNode => {
+    let token = state.previousToken;
+    switch (token.type) {
+        case "variable":
+            return {
+                type: "variable",
+                value: token.value,
+                position: token.position,
+            };
+        case "name":
+            return {
+                type: "name",
+                value: token.value,
+                position: token.position,
+            };
+        case "literal":
+            return {
+                type: "literal",
+                value: token.value,
+                position: token.position,
+            };
+        case "regex":
+            return {
+                type: "regex",
+                value: token.value,
+                position: token.position,
+            };
+        case "operator":
+            return {
+                type: "operator",
+                value: token.value,
+                position: token.position,
+            };
+        default:
+            /* istanbul ignore next */
+            if (state.symbol.id !== "(end)") {
+                throw new Error("Unexpected terminal: " + JSON.stringify(self));
+            }
+            return {
+                type: "end",
+                value: "(end)",
+                position: token.position,
+            };
+    }
+};
+
+export const wildcardNUD = (state: ParserState): ast.WildcardNode => {
+    return {
+        value: state.previousToken.value,
+        position: state.previousToken.position,
+        type: "wildcard",
+    };
+};
+
+export const descendantNUD = (state: ParserState): ast.DescendantNode => {
+    return {
+        value: state.previousToken.value,
+        position: state.previousToken.position,
+        type: "descendant",
+    };
+};
+
+export const blockNUD = (state: ParserState): ast.BlockNode => {
+    var expressions = [];
+    while (state.symbol.id !== ")") {
+        expressions.push(state.expression(0));
+        if (state.symbol.id !== ";") {
+            break;
+        }
+        state.advance(";");
+    }
+    state.advance(")", true);
+    return {
+        value: state.token.value,
+        position: state.token.position,
+        type: "block",
+        expressions: expressions,
+    };
+};
+
+export const arrayNUD = (state: ParserState): ast.UnaryNode => {
+    var a = [];
+    let initialToken = state.previousToken;
+    if (state.symbol.id !== "]") {
+        for (;;) {
+            var item = state.expression(0);
+            if (state.symbol.id === "..") {
+                let position = state.token.position;
+                let lhs = item;
+                // range operator
+                state.advance("..");
+                let rhs = state.expression(0);
+                var range: ast.BinaryNode = {
+                    type: "binary",
+                    value: "..",
+                    position: position,
+                    lhs: lhs,
+                    rhs: rhs,
+                };
+                item = range;
+            }
+            a.push(item);
+            if (state.symbol.id !== ",") {
+                break;
+            }
+            state.advance(",");
+        }
+    }
+    state.advance("]", true);
+    return {
+        value: initialToken.value,
+        position: initialToken.position,
+        type: "unary",
+        expressions: a,
+        consarray: false,
+    };
+};
+
+export const objectParserNUD: NUD = (state: ParserState): ast.UnaryNode => {
+    var a = [];
+    let initialToken = state.previousToken;
+    /* istanbul ignore else */
+    if (state.symbol.id !== "}") {
+        for (;;) {
+            var n = state.expression(0);
+            state.advance(":");
+            var v = state.expression(0);
+            a.push([n, v]); // holds an array of name/value expression pairs
+            if (state.symbol.id !== ",") {
+                break;
+            }
+            state.advance(",");
+        }
+    }
+    state.advance("}", true);
+    // NUD - unary prefix form
+    return {
+        value: initialToken.value,
+        position: initialToken.position,
+        type: "unary",
+        lhs: a, // TODO: use expression
+    };
+};
+
+export const transformerNUD = (state: ParserState): ast.TransformNode => {
+    let initialToken = state.previousToken;
+    let expr = state.expression(0);
+    state.advance("|");
+    let update = state.expression(0);
+    let del = undefined;
+    if (state.symbol.id === ",") {
+        state.advance(",");
+        del = state.expression(0);
+    }
+    state.advance("|");
+    return {
+        value: initialToken.value,
+        position: initialToken.position,
+        type: "transform",
+        pattern: expr,
+        update: update,
+        delete: del,
+    };
+};
diff --git a/src/parser/optimize.ts b/src/parser/optimize.ts
new file mode 100644
index 00000000..3d89e726
--- /dev/null
+++ b/src/parser/optimize.ts
@@ -0,0 +1,365 @@
+import { isNumeric } from "../utils";
+import { tail_call_optimize } from "./tail_call";
+import { ErrorCollector } from "./types";
+import * as ast from "../ast";
+
+// post-parse stage
+// the purpose of this is flatten the parts of the AST representing location paths,
+// converting them to arrays of steps which in turn may contain arrays of predicates.
+// following this, nodes containing '.' and '[' should be eliminated from the AST.
+export function ast_optimize(expr: ast.ASTNode, collect: undefined | ErrorCollector): ast.ASTNode {
+    switch (expr.type) {
+        case "binary": {
+            switch (expr.value) {
+                case ".":
+                    let lstep = ast_optimize(expr.lhs, collect);
+                    let steps: ast.ASTNode[] = [];
+                    let keepSA: boolean = false;
+                    if (lstep.type === "path") {
+                        steps = lstep.steps;
+                        if (lstep.keepSingletonArray) keepSA = true;
+                    } else {
+                        steps = [lstep];
+                    }
+                    let rest = ast_optimize(expr.rhs, collect);
+                    let last = steps[steps.length - 1];
+
+                    if (
+                        rest.type === "function" &&
+                        rest.procedure.type === "path" &&
+                        rest.procedure.steps.length === 1 &&
+                        rest.procedure.steps[0].type === "name" &&
+                        last.type === "function"
+                    ) {
+                        // next function in chain of functions - will override a thenable
+                        last.nextFunction = rest.procedure.steps[0].value;
+                    }
+
+                    if (rest.type === "path") {
+                        steps = [...steps, ...rest.steps];
+                    } else {
+                        steps = [...steps, rest];
+                    }
+                    // any steps within a path that are literals, should be changed to 'name'
+                    steps.filter(step => step.type === "literal").forEach(lit => {
+                        lit.type = "name";
+                    });
+
+                    /* istanbul ignore else */
+                    if (steps.length > 0) {
+                        // If I understand the previous comments, if the first "step" is a
+                        // unary node with a value of "[", that indicates it is a path constructor.
+                        // However, if the last step is also a unary node with a value of "[", that makes
+                        // it an array constructor.  In either case, our goal here is to set the
+                        // consarray field to be true for either of these if they are unary nodes with
+                        // value of "["
+
+                        // if first step is a path constructor, flag it for special handling
+                        markAsArray(steps[0]); // Check for PATH!
+                        // if last step is an array constructor, flag ti for special handling
+                        markAsArray(steps[steps.length - 1]);
+                    }
+
+                    return {
+                        type: "path",
+                        position: expr.position,
+                        value: expr.value,
+                        steps: steps,
+                        keepSingletonArray: keepSA,
+                    };
+                case "[": {
+                    // predicated step
+                    // LHS is a step or a predicated step
+                    // RHS is the predicate expr
+                    let node = ast_optimize(expr.lhs, collect);
+                    var step = node;
+                    if (node.type === "path") {
+                        step = node.steps[node.steps.length - 1];
+                    }
+                    if (typeof step.group !== "undefined") {
+                        throw {
+                            code: "S0209",
+                            stack: new Error().stack,
+                            position: expr.position,
+                        };
+                    }
+                    // If no predicates are associated with this step, initialize the
+                    // array to be empty.
+                    if (typeof step.predicate === "undefined") {
+                        step.predicate = [];
+                    }
+                    // Add the current RHS to the list of predicates for this step.
+                    // Multiple predicates can accumulate (i.e., step.predicate may
+                    // have already had elements in it before getting here).
+                    step.predicate.push(ast_optimize(expr.rhs, collect));
+                    return node;
+                }
+                case "{": {
+                    // group-by
+                    // LHS is a step or a predicated step
+                    // RHS is the object constructor expr
+                    let node = ast_optimize(expr.lhs, collect);
+                    if (typeof node.group !== "undefined") {
+                        throw {
+                            code: "S0210",
+                            stack: new Error().stack,
+                            position: expr.position,
+                        };
+                    }
+                    // object constructor - process each pair
+                    node.group = {
+                        lhs: expr.rhs.map(pair => {
+                            return [ast_optimize(pair[0], collect), ast_optimize(pair[1], collect)];
+                        }),
+                        position: expr.position,
+                    };
+                    return node;
+                }
+                case ":=": {
+                    let lhs = ast_optimize(expr.lhs, collect);
+                    let rhs = ast_optimize(expr.rhs, collect);
+                    return {
+                        type: "bind",
+                        value: expr.value,
+                        position: expr.position,
+                        lhs: lhs,
+                        rhs: rhs,
+                    };
+                }
+                case "~>": {
+                    let lhs = ast_optimize(expr.lhs, collect);
+                    let rhs = ast_optimize(expr.rhs, collect);
+                    return {
+                        type: "apply",
+                        value: expr.value,
+                        position: expr.position,
+                        lhs: lhs,
+                        rhs: rhs,
+                    };
+                }
+                default:
+                    return {
+                        ...expr,
+                        lhs: ast_optimize(expr.lhs, collect),
+                        rhs: ast_optimize(expr.rhs, collect),
+                    };
+            }
+        }
+        case "sort":
+            return {
+                type: "sort",
+                value: expr.value,
+                position: expr.position,
+                lhs: ast_optimize(expr.lhs, collect),
+                rhs: expr.rhs.map(term => ({ ...term, expression: ast_optimize(term.expression, collect) })),
+            };
+        case "unary":
+            switch (expr.value) {
+                case "[": {
+                    let expressions = expr.expressions.map(item => ast_optimize(item, collect));
+                    return {
+                        ...expr,
+                        expressions: expressions,
+                    };
+                }
+                case "{": {
+                    let lhs = expr.lhs.map(pair => {
+                        return [ast_optimize(pair[0], collect), ast_optimize(pair[1], collect)];
+                    });
+                    return {
+                        ...expr,
+                        lhs: lhs,
+                    };
+                }
+                default: {
+                    // all other unary expressions - just process the expression
+                    let expression = ast_optimize(expr.expression, collect);
+                    // if unary minus on a number, then pre-process
+                    if (expr.value === "-" && expression.type === "literal" && isNumeric(expression.value)) {
+                        return {
+                            ...expression,
+                            value: -expression.value,
+                        };
+                    }
+                    return {
+                        ...expr,
+                        expression: expression,
+                    };
+                }
+            }
+        case "function":
+        case "partial": {
+            let args = expr.arguments.map(arg => {
+                return ast_optimize(arg, collect);
+            });
+            let procedure = ast_optimize(expr.procedure, collect);
+            return {
+                ...expr,
+                arguments: args,
+                procedure: procedure,
+            };
+        }
+        case "lambda": {
+            let body = ast_optimize(expr.body, collect);
+            body = tail_call_optimize(body);
+            // All arguments to a lambda should be variables so running
+            // ast_optimize should be a NO-OP.  But I run it anyway just in case
+            // those semantics change some day.  This keeps things consistent
+            // and doesn't impact the results.
+            let args = expr.arguments.map(arg => ast_optimize(arg, collect));
+            return {
+                ...expr,
+                body: body,
+                arguments: args,
+            };
+        }
+        case "condition": {
+            let condition = ast_optimize(expr.condition, collect);
+            let then = ast_optimize(expr.then, collect);
+            let otherwise: undefined | ast.ASTNode = undefined;
+            if (typeof expr.else !== "undefined") {
+                otherwise = ast_optimize(expr.else, collect);
+            }
+            return {
+                type: "condition",
+                position: expr.position,
+                value: expr.value,
+                condition: condition,
+                then: then,
+                else: otherwise,
+            };
+        }
+        case "transform": {
+            let pattern = ast_optimize(expr.pattern, collect);
+            let update = ast_optimize(expr.update, collect);
+            let del: undefined | ast.ASTNode = undefined;
+            if (typeof expr.delete !== "undefined") {
+                del = ast_optimize(expr.delete, collect);
+            }
+            return {
+                type: "transform",
+                position: expr.position,
+                value: expr.value,
+                pattern: pattern,
+                update: update,
+                delete: del,
+            };
+        }
+        case "block":
+            // TODO scan the array of expressions to see if any of them assign variables
+            // if so, need to mark the block as one that needs to create a new frame
+            let expressions = expr.expressions.map(item => {
+                return ast_optimize(item, collect);
+            });
+            return {
+                type: "block",
+                value: expr.value,
+                position: expr.position,
+                expressions: expressions,
+            };
+        case "name":
+            return {
+                type: "path",
+                value: expr.value,
+                position: expr.position,
+                keepSingletonArray: false,
+                steps: [expr],
+            };
+        case "literal":
+        case "wildcard":
+        case "descendant":
+        case "variable":
+        case "regex":
+            return expr;
+        case "singleton": {
+            // Optimize the AST node wrapped by this singleton decorator
+            let opt = ast_optimize(expr.next, collect);
+
+            // No matter which branch we take, we replace the singleton with
+            // a path node with the keepSingleArray flag set.
+            if (opt.type==="path") {
+                // If this is a path, then we can simply set the keepSingleArray
+                // fields on it.
+                return {
+                    ...opt,
+                    keepSingletonArray: true,
+                }
+            } else {
+                // If this isn't a path, create a length 1 path and mark it as preserving
+                // singleton arrays.
+                return {
+                    type: "path",
+                    value: opt.value,
+                    position: opt.position,
+                    steps: [opt],
+                    keepSingletonArray: true,
+                }
+            }
+        }
+        case "operator":
+            // the tokens 'and' and 'or' might have been used as a name rather than an operator
+            if (expr.value === "and" || expr.value === "or" || expr.value === "in") {
+                return ast_optimize({ ...expr, type: "name" }, collect);
+            } else {
+                /* istanbul ignore else */
+                if (expr.value === "?") {
+                    // partial application
+                    return { ...expr };
+                } else {
+                    throw {
+                        code: "S0201",
+                        stack: new Error().stack,
+                        position: expr.position,
+                        token: expr.value,
+                    };
+                }
+            }
+        case "error":
+            if (expr.lhs) {
+                return ast_optimize(expr.lhs, collect);
+            }
+            return expr;
+        default:
+            var code = "S0206";
+            /* istanbul ignore else */
+            if (expr.type == "end") {
+                code = "S0207";
+            }
+            var err: ast.ErrorFields = {
+                code: code,
+                position: expr.position,
+                token: expr.value,
+            };
+            if (collect) {
+                collect(err);
+                return {
+                    type: "error",
+                    error: err,
+                    lhs: expr,
+                    remaining: [],
+                    value: expr.value,
+                    position: expr.position,
+                };
+            } else {
+                err.stack = new Error().stack;
+                throw err;
+            }
+    }
+}
+
+/**
+ * This checks a node to see if it is an array constructor.  If so,
+ * it marks it with the `consarray` field which is used to indicate the
+ * node should not be flattened. (?)
+ *
+ * @param node The node to check
+ */
+function markAsArray(node: ast.ASTNode) {
+    if (node.type === "unary") {
+        let unary = node;
+        if (unary.value === "[") {
+            let array = unary;
+            array.consarray = true;
+        }
+    }
+}
diff --git a/src/parser/parser.ts b/src/parser/parser.ts
new file mode 100644
index 00000000..580c1c24
--- /dev/null
+++ b/src/parser/parser.ts
@@ -0,0 +1,189 @@
+import { tokenizer, Tokenizer, Token } from "../tokenizer";
+import { ast_optimize } from "./optimize";
+import { createTable } from "./symbols";
+import * as ast from "../ast";
+
+import { Symbol, ParserState, SymbolTable } from "./types";
+
+/**
+ * The parser was made into a class primarily so it was easier to track the state of
+ * the parser.  In version 1.x, the shared state was represented by variables inside
+ * a closure, but this way it is a bit easier to see the shared state and a bit easier
+ * to implement the supporting functions (as methods).
+ */
+class Parser implements ParserState {
+    // These are used to satisfy the ParserState interface
+    symbol: Symbol = undefined;
+    previousToken: Token = undefined;
+    token: Token = undefined;
+    error: any = undefined;
+
+    // This is public state information used after parse is called
+    errors: string[] = [];
+
+    // These are protected elements used by the Parser, but not available to the
+    // NUD and LED handlers
+    protected lexer: Tokenizer;
+    protected symbol_table: SymbolTable;
+
+    constructor(protected source: string, protected recover?: boolean) {
+        // now invoke the tokenizer and the parser and return the syntax tree
+        this.lexer = tokenizer(source);
+        this.symbol_table = createTable(recover, this.errors, () => this.remainingTokens());    
+    }
+    parse(): ast.ASTNode {
+        this.advance();
+        // parse the tokens
+        var expr = this.expression(0);
+        if (this.symbol.id !== "(end)") {
+            var err = {
+                code: "S0201",
+                position: this.token.position,
+                token: this.token.value,
+            };
+            this.handleError(err);
+        }
+    
+        // Decide if we want to collect errors and recover, or just throw an error
+        let collect = this.recover ? err => this.errors.push(err) : undefined;
+        expr = ast_optimize(expr, collect);
+        
+        return expr;
+    }
+
+    private remainingTokens(): Token[] {
+        var remaining: Token[] = [];
+        if (this.symbol.id !== "(end)") {
+            remaining.push(this.token);
+        }
+        var nxt: Token = this.lexer(undefined);
+        while (nxt !== null) {
+            remaining.push(nxt);
+            nxt = this.lexer(undefined);
+        }
+        return remaining;
+    }
+
+    handleError(err: any): void {
+        if (this.recover) {
+            // tokenize the rest of the buffer and add it to an error token
+            err.remaining = this.remainingTokens();
+            this.errors.push(err);
+            var symbol = this.symbol_table["(error)"];
+            this.symbol = Object.create(symbol);
+            this.previousToken = this.token;
+            this.token = {
+                type: "(error)",
+                value: null,
+                position: this.token.position,
+            };
+            this.error = err;
+        } else {
+            err.stack = new Error().stack;
+            throw err;
+        }
+    }
+
+    advance(id?: string, infix?: boolean) {
+        if (id && this.symbol.id !== id) {
+            var code;
+            if (this.symbol.id === "(end)") {
+                // unexpected end of buffer
+                code = "S0203";
+            } else {
+                code = "S0202";
+            }
+            var err = {
+                code: code,
+                position: this.token.position,
+                token: this.token.value,
+                value: id,
+            };
+            return this.handleError(err);
+        }
+        var next_token: Token = this.lexer(infix);
+        if (next_token === null) {
+            let symbol = this.symbol_table["(end)"];
+            this.symbol = Object.create(symbol);
+            this.previousToken = this.token;
+            this.token = {
+                type: "(end)",
+                value: symbol.value,
+                position: this.source.length,
+            };
+            this.error = undefined;
+            return;
+        }
+        var value = next_token.value;
+        var type = next_token.type;
+        var symbol;
+        switch (type) {
+            case "name":
+            case "variable":
+                symbol = this.symbol_table["(name)"];
+                break;
+            case "operator":
+                symbol = this.symbol_table[value];
+                if (!symbol) {
+                    return this.handleError({
+                        code: "S0204",
+                        stack: new Error().stack,
+                        position: next_token.position,
+                        token: value,
+                    });
+                }
+                break;
+            case "string":
+            case "number":
+            case "value":
+                type = "literal";
+                symbol = this.symbol_table["(literal)"];
+                break;
+            case "regex":
+                type = "regex";
+                symbol = this.symbol_table["(regex)"];
+                break;
+            /* istanbul ignore next */
+            default:
+                return this.handleError({
+                    code: "S0205",
+                    stack: new Error().stack,
+                    position: next_token.position,
+                    token: value,
+                });
+        }
+    
+        this.symbol = Object.create(symbol);
+        this.previousToken = this.token;
+        this.token = {
+                value: value,
+                type: type,
+                position: next_token.position,
+            };
+        this.error = undefined;
+        return;
+    }
+
+    expression(rbp: number): ast.ASTNode {
+        let symbol = this.symbol;
+        this.advance(null, true);
+        var left: ast.ASTNode = symbol.nud(this);
+        while (rbp < this.symbol.lbp) {
+            symbol = this.symbol;
+            this.advance();
+            left = symbol.led(this, left);
+        }
+        return left;
+    }
+}
+
+// This parser implements the 'Top down operator precedence' algorithm developed by Vaughan R Pratt; http://dl.acm.org/citation.cfm?id=512931.
+// and builds on the Javascript framework described by Douglas Crockford at http://javascript.crockford.com/tdop/tdop.html
+// and in 'Beautiful Code', edited by Andy Oram and Greg Wilson, Copyright 2007 O'Reilly Media, Inc. 798-0-596-51004-6
+export function parser(source: string, errors: string[], recover?: boolean): ast.ASTNode {
+    let p = new Parser(source, recover);
+    let ast = p.parse();
+    p.errors.forEach((err) => errors.push(err));
+    return ast;
+}
+
diff --git a/src/parser/symbols.ts b/src/parser/symbols.ts
new file mode 100644
index 00000000..763104c4
--- /dev/null
+++ b/src/parser/symbols.ts
@@ -0,0 +1,167 @@
+import { operators } from "../constants";
+import { Symbol, LED, NUD, ParserState, SymbolTable } from "./types";
+import { Token } from "../tokenizer";
+import * as nuds from "./nuds";
+import * as leds from "./leds";
+import * as ast from "../ast";
+
+export function createTable(recover: boolean, errors: string[], remainingTokens: () => Token[]): SymbolTable {
+    let symbol_table: { [id: string]: Symbol } = {};
+
+    var getSymbol = (id, bp: number): Symbol => {
+        bp = bp || 0;
+        if (symbol_table.hasOwnProperty(id)) {
+            let s = symbol_table[id];
+            // TODO: Should this ever happen?!?  Aren't we overwriting something?!?
+            if (bp >= s.lbp) {
+                s.lbp = bp;
+            }
+            return s;
+        } else {
+            let s: Symbol = {
+                id: id,
+                lbp: bp,
+                value: id,
+                nud: nuds.defaultNUD(recover, errors, remainingTokens),
+            };
+            symbol_table[id] = s;
+            return s;
+        }
+    };
+
+    // A terminal could be a 'literal', 'variable', 'name'
+    var terminal = id => {
+        var s = getSymbol(id, 0);
+        s.nud = nuds.terminalNUD;
+    };
+
+    // match infix operators
+    // <expression> <operator> <expression>
+    // left associative
+    // TODO: Add default values for bp and led
+    var infix = (id: string, bp?: number, led?: LED) => {
+        var bindingPower = bp || operators[id];
+        var s = getSymbol(id, bindingPower);
+        let defaultLED: LED = leds.infixDefaultLED(bindingPower);
+        s.led = led || defaultLED;
+        return s;
+    };
+
+    // match infix operators
+    // <expression> <operator> <expression>
+    // right associative
+    // TODO: Add default values for bp and led
+    var infixr = (id, bp?, led?: LED) => {
+        var bindingPower = bp || operators[id];
+        var s = getSymbol(id, bindingPower);
+        let defaultLED: LED = leds.infixDefaultLED(bindingPower - 1); // subtract 1 from bindingPower for right associative operators
+        s.led = led || defaultLED;
+        return s;
+    };
+
+    // match prefix operators
+    // <operator> <expression>
+    var prefix = (id, nud?: NUD) => {
+        var s = getSymbol(id, 0);
+        let defaultNUD: NUD = nuds.prefixDefaultNUD(70);
+        s.nud = nud || defaultNUD;
+        return s;
+    };
+
+    terminal("(end)");
+    terminal("(name)");
+    terminal("(literal)");
+    terminal("(regex)");
+    getSymbol(":", 0);
+    getSymbol(";", 0);
+    getSymbol(",", 0);
+    getSymbol(")", 0);
+    getSymbol("]", 0);
+    getSymbol("}", 0);
+    getSymbol("..", 0); // range operator
+    infix("."); // field reference
+    infix("+"); // numeric addition
+    infix("-"); // numeric subtraction
+    infix("*"); // numeric multiplication
+    infix("/"); // numeric division
+    infix("%"); // numeric modulus
+    infix("="); // equality
+    infix("<"); // less than
+    infix(">"); // greater than
+    infix("!="); // not equal to
+    infix("<="); // less than or equal
+    infix(">="); // greater than or equal
+    infix("&"); // string concatenation
+    infix("and"); // Boolean AND
+    infix("or"); // Boolean OR
+    infix("in"); // is member of array
+    terminal("and"); // the 'keywords' can also be used as terminals (field names)
+    terminal("or"); //
+    terminal("in"); //
+    infixr(":="); // bind variable
+    prefix("-"); // unary numeric negation
+    infix("~>"); // function application
+
+    infixr("(error)", 10, (state: ParserState, left: ast.ASTNode): ast.ErrorNode => {
+        return {
+            value: state.token.value,
+            position: state.token.position,
+            lhs: left,
+            error: state.error,
+            remaining: remainingTokens(),
+            type: "error",
+        };
+    });
+
+    // field wildcard (single level)
+    prefix("*", nuds.wildcardNUD);
+
+    // descendant wildcard (multi-level)
+    prefix("**", nuds.descendantNUD);
+
+    // function invocation
+    infix("(", operators["("], leds.functionLED);
+
+    // parenthesis - block expression
+    prefix("(", nuds.blockNUD);
+
+    // array constructor
+    prefix("[", nuds.arrayNUD);
+
+    // filter - predicate or array index
+    infix("[", operators["["], leds.filterLED);
+
+    // order-by
+    infix("^", operators["^"], leds.orderByLED);
+
+    // object constructor
+    prefix("{", nuds.objectParserNUD);
+
+    // object grouping
+    infix("{", operators["{"], leds.objectParserLED);
+
+    // if/then/else ternary operator ?:
+    infix("?", operators["?"], (state: ParserState, left): ast.TernaryNode => {
+        let initialToken = state.previousToken;
+        let then = state.expression(0);
+        let otherwise = undefined;
+        if (state.symbol.id === ":") {
+            // else condition
+            state.advance(":");
+            otherwise = state.expression(0);
+        }
+        return {
+            value: initialToken.value,
+            position: initialToken.position,
+            type: "condition",
+            condition: left,
+            then: then,
+            else: otherwise,
+        };
+    });
+
+    // object transformer
+    prefix("|", nuds.transformerNUD);
+
+    return symbol_table;
+}
diff --git a/src/parser/tail_call.ts b/src/parser/tail_call.ts
new file mode 100644
index 00000000..6611890a
--- /dev/null
+++ b/src/parser/tail_call.ts
@@ -0,0 +1,45 @@
+import * as ast from '../ast';
+import { parseSignature } from "../signatures";
+
+// tail call optimization
+// this is invoked by the post parser to analyse lambda functions to see
+// if they make a tail call.  If so, it is replaced by a thunk which will
+// be invoked by the trampoline loop during function application.
+// This enables tail-recursive functions to be written without growing the stack
+export function tail_call_optimize(expr: ast.ASTNode): ast.ASTNode {
+    switch(expr.type) {
+        case "function": {
+            return {
+                type: "lambda",
+                value: expr.value,
+                position: expr.position,
+                body: expr,
+                // Not in v1.5, but ensures that signature isn't undefined
+                signature: parseSignature(""),
+                thunk: true,
+                arguments: [],
+            };
+        }
+        case "condition": {
+            let then = tail_call_optimize(expr.then);
+            let otherwise: undefined | ast.ASTNode = undefined;
+            if (typeof expr.else!=="undefined") {
+                otherwise = tail_call_optimize(expr.else);
+            }
+            return {
+                ...expr,
+                then: then,
+                else: otherwise,
+            }
+        }
+        case "block": {
+            let expressions = expr.expressions.map((e, i) => i==expr.expressions.length-1 ? tail_call_optimize(e) : e);
+            return {
+                ...expr,
+                expressions: expressions,
+            }
+        }
+        default:
+            return { ...expr };
+    }
+}
diff --git a/src/parser/types.ts b/src/parser/types.ts
new file mode 100644
index 00000000..47f5477c
--- /dev/null
+++ b/src/parser/types.ts
@@ -0,0 +1,27 @@
+import * as ast from "../ast";
+import { Token } from "../tokenizer";
+export type NUD = (state: ParserState) => ast.ASTNode;
+export type LED = (state: ParserState, left: ast.ASTNode) => ast.ASTNode;
+
+export interface Symbol {
+    id: string;
+    lbp: number;
+    nud: NUD;
+    led?: LED;
+    position?: number;
+    value: any;
+}
+
+export interface ParserState {
+    readonly symbol: Symbol;
+    readonly previousToken: Token;
+    readonly token: Token;
+    readonly error: any;
+    advance: (id?: string, infix?: boolean) => void;
+    expression: (rbp: number) => ast.ASTNode;
+    handleError: (err) => void;
+}
+
+export type SymbolTable = { [id: string]: Symbol };
+
+export type ErrorCollector = (err: any) => void;
\ No newline at end of file
diff --git a/src/signatures.ts b/src/signatures.ts
new file mode 100644
index 00000000..4312d185
--- /dev/null
+++ b/src/signatures.ts
@@ -0,0 +1,341 @@
+import { isFunction } from './utils';
+
+export interface Signature {
+    definition: string;
+    validate: (args: any, context: any) => any[];
+}
+
+export interface Parameter {
+    regex: string;
+    type: string;
+    array: boolean;
+    context?: boolean;
+    contextRegex?: RegExp;
+    subtype?: string;
+}
+
+/**
+ * Parses a function signature definition and returns a validation function
+ * @param {string} signature - the signature between the <angle brackets>
+ * @returns {Function} validation function
+ */
+export function parseSignature(signature: string): Signature {
+    // create a Regex that represents this signature and return a function that when invoked,
+    // returns the validated (possibly fixed-up) arguments, or throws a validation error
+    // step through the signature, one symbol at a time
+    var position = 1;
+    var params: Parameter[] = [];
+    var prevParam: undefined | Parameter = undefined;
+    while (position < signature.length) {
+        var symbol = signature.charAt(position);
+        if (symbol === ":") {
+            // TODO figure out what to do with the return type
+            // ignore it for now
+            break;
+        }
+
+        var next = function(param: Parameter) {
+            params.push(param);
+            prevParam = param;
+        };
+
+        var findClosingBracket = function(str, start, openSymbol, closeSymbol) {
+            // returns the position of the closing symbol (e.g. bracket) in a string
+            // that balances the opening symbol at position start
+            var depth = 1;
+            var position = start;
+            while (position < str.length) {
+                position++;
+                symbol = str.charAt(position);
+                if (symbol === closeSymbol) {
+                    depth--;
+                    if (depth === 0) {
+                        // we're done
+                        break; // out of while loop
+                    }
+                } else if (symbol === openSymbol) {
+                    depth++;
+                }
+            }
+            return position;
+        };
+
+        switch (symbol) {
+            case "s": // string
+            case "n": // number
+            case "b": // boolean
+            case "l": // not so sure about expecting null?
+            case "o": // object
+                next({
+                    regex: "[" + symbol + "m]",
+                    type: symbol,
+                    array: false,
+                });
+                break;
+            case "a": // array
+                //  normally treat any value as singleton array
+                next({
+                    regex: "[asnblfom]",
+                    type: symbol,
+                    array: true,
+                });
+                break;
+            case "f": // function
+                next({
+                    regex: "f",
+                    type: symbol, 
+                    array: false,   
+                });
+                break;
+            case "j": // any JSON type
+                next({
+                    regex: "[asnblom]",
+                    type: symbol, 
+                    array: false,
+                });
+                break;
+            case "x": // any type
+                next({
+                    regex: "[asnblfom]",
+                    type: symbol,
+                    array: false,
+                });
+                break;
+            case "-": // use context if param not supplied
+                prevParam.context = true;
+                prevParam.contextRegex = new RegExp(prevParam.regex); // pre-compiled to test the context type at runtime
+                prevParam.regex += "?";
+                break;
+            case "?": // optional param
+            case "+": // one or more
+                prevParam.regex += symbol;
+                break;
+            case "(": // choice of types
+                // search forward for matching ')'
+                var endParen = findClosingBracket(signature, position, "(", ")");
+                var choice = signature.substring(position + 1, endParen);
+                if (choice.indexOf("<") !==-1) {
+                    // TODO harder
+                    throw {
+                        code: "S0402",
+                        stack: new Error().stack,
+                        value: choice,
+                        offset: position,
+                    };
+                }
+                position = endParen;
+                next({
+                    regex: "[" + choice + "m]",
+                    type: "(" + choice + ")",  
+                    array: false,
+                });
+                break;
+            case "<": // type parameter - can only be applied to 'a' and 'f'
+                if (prevParam.type === "a" || prevParam.type === "f") {
+                    // search forward for matching '>'
+                    var endPos = findClosingBracket(signature, position, "<", ">");
+                    prevParam.subtype = signature.substring(position + 1, endPos);
+                    position = endPos;
+                } else {
+                    throw {
+                        code: "S0401",
+                        stack: new Error().stack,
+                        value: prevParam.type,
+                        offset: position,
+                    };
+                }
+                break;
+        }
+        position++;
+    }
+    var regexStr =
+        "^" +
+        params
+            .map(function(param) {
+                return "(" + param.regex + ")";
+            })
+            .join("") +
+        "$";
+    var regex = new RegExp(regexStr);
+    var getSymbol = function(value) {
+        var symbol;
+        if (isFunction(value)) {
+            symbol = "f";
+        } else {
+            var type = typeof value;
+            switch (type) {
+                case "string":
+                    symbol = "s";
+                    break;
+                case "number":
+                    symbol = "n";
+                    break;
+                case "boolean":
+                    symbol = "b";
+                    break;
+                case "object":
+                    if (value === null) {
+                        symbol = "l";
+                    } else if (Array.isArray(value)) {
+                        symbol = "a";
+                    } else {
+                        symbol = "o";
+                    }
+                    break;
+                case "undefined":
+                default:
+                    // any value can be undefined, but should be allowed to match
+                    symbol = "m"; // m for missing
+            }
+        }
+        return symbol;
+    };
+
+    var throwValidationError = function(badArgs, badSig): never {
+        // to figure out where this went wrong we need apply each component of the
+        // regex to each argument until we get to the one that fails to match
+        var partialPattern = "^";
+        var goodTo = 0;
+        for (var index = 0; index < params.length; index++) {
+            partialPattern += params[index].regex;
+            var match = badSig.match(partialPattern);
+            if (match === null) {
+                // failed here
+                throw {
+                    code: "T0410",
+                    stack: new Error().stack,
+                    value: badArgs[goodTo],
+                    index: goodTo + 1,
+                };
+            }
+            goodTo = match[0].length;
+        }
+        // if it got this far, it's probably because of extraneous arguments (we
+        // haven't added the trailing '$' in the regex yet.
+        throw {
+            code: "T0410",
+            stack: new Error().stack,
+            value: badArgs[goodTo],
+            index: goodTo + 1,
+        };
+    };
+
+    return {
+        definition: signature,
+        validate: function(args, context) {
+            var suppliedSig = "";
+            args.forEach(function(arg) {
+                suppliedSig += getSymbol(arg);
+            });
+            var isValid = regex.exec(suppliedSig);
+            if (isValid) {
+                var validatedArgs = [];
+                var argIndex = 0;
+                params.forEach(function(param, index) {
+                    var arg = args[argIndex];
+                    var match = isValid[index + 1];
+                    if (match === "") {
+                        if (param.context && param.contextRegex) {
+                            // substitute context value for missing arg
+                            // first check that the context value is the right type
+                            var contextType = getSymbol(context);
+                            // test contextType against the regex for this arg (without the trailing ?)
+                            if (param.contextRegex.test(contextType)) {
+                                validatedArgs.push(context);
+                            } else {
+                                // context value not compatible with this argument
+                                throw {
+                                    code: "T0411",
+                                    stack: new Error().stack,
+                                    value: context,
+                                    index: argIndex + 1,
+                                };
+                            }
+                        } else {
+                            validatedArgs.push(arg);
+                            argIndex++;
+                        }
+                    } else {
+                        // may have matched multiple args (if the regex ends with a '+'
+                        // split into single tokens
+                        match.split("").forEach(function(single) {
+                            if (param.type === "a") {
+                                if (single === "m") {
+                                    // missing (undefined)
+                                    arg = undefined;
+                                } else {
+                                    arg = args[argIndex];
+                                    var arrayOK = true;
+                                    // is there type information on the contents of the array?
+                                    if (typeof param.subtype !== "undefined") {
+                                        if (single !== "a" && match !== param.subtype) {
+                                            arrayOK = false;
+                                        } else if (single === "a") {
+                                            if (arg.length > 0) {
+                                                var itemType = getSymbol(arg[0]);
+                                                if (itemType !== param.subtype.charAt(0)) {
+                                                    // TODO recurse further
+                                                    arrayOK = false;
+                                                } else {
+                                                    // make sure every item in the array is this type
+                                                    var differentItems = arg.filter(function(val) {
+                                                        return getSymbol(val) !== itemType;
+                                                    });
+                                                    arrayOK = differentItems.length === 0;
+                                                }
+                                            }
+                                        }
+                                    }
+                                    if (!arrayOK) {
+                                        throw {
+                                            code: "T0412",
+                                            stack: new Error().stack,
+                                            value: arg,
+                                            index: argIndex + 1,
+                                            type: param.subtype, // TODO translate symbol to type name
+                                        };
+                                    }
+                                    // the function expects an array. If it's not one, make it so
+                                    if (single !== "a") {
+                                        arg = [arg];
+                                    }
+                                }
+                                validatedArgs.push(arg);
+                                argIndex++;
+                            } else {
+                                validatedArgs.push(arg);
+                                argIndex++;
+                            }
+                        });
+                    }
+                });
+                return validatedArgs;
+            }
+            return throwValidationError(args, suppliedSig);
+        },
+    };
+}
+
+export interface FunctionDefinition {
+    _jsonata_function: boolean;
+    implementation: Function;
+    signature?: Signature;
+}
+
+/**
+ * Creates a function definition
+ * @param {Function} func - function implementation in Javascript
+ * @param {string} signature - JSONata function signature definition
+ * @returns {{implementation: *, signature: *}} function definition
+ */
+export function defineFunction(func: Function, signature?: string): FunctionDefinition {
+    var definition: FunctionDefinition = {
+        _jsonata_function: true,
+        implementation: func,
+        signature: undefined,
+    };
+    if (typeof signature !== "undefined") {
+        definition.signature = parseSignature(signature);
+    }
+    return definition;
+}
diff --git a/src/tokenizer.ts b/src/tokenizer.ts
new file mode 100644
index 00000000..0d707c21
--- /dev/null
+++ b/src/tokenizer.ts
@@ -0,0 +1,253 @@
+import { operators, escapes } from "./constants";
+
+export interface Token {
+    type: string;
+    value: any;
+    position: number;
+}
+
+export type Tokenizer = (prefix: boolean) => Token;
+
+// Tokenizer (lexer) - invoked by the parser to return one token at a time
+export function tokenizer(path: string): Tokenizer {
+    var position = 0;
+    var length = path.length;
+
+    var create = function(type: string, value: any): Token {
+        var obj = { type: type, value: value, position: position };
+        return obj;
+    };
+
+    var scanRegex = function() {
+        // the prefix '/' will have been previously scanned. Find the end of the regex.
+        // search for closing '/' ignoring any that are escaped, or within brackets
+        var start = position;
+        var depth = 0;
+        var pattern;
+        var flags;
+        while (position < length) {
+            var currentChar = path.charAt(position);
+            if (currentChar === "/" && path.charAt(position - 1) !== "\\" && depth === 0) {
+                // end of regex found
+                pattern = path.substring(start, position);
+                if (pattern === "") {
+                    throw {
+                        code: "S0301",
+                        stack: new Error().stack,
+                        position: position,
+                    };
+                }
+                position++;
+                currentChar = path.charAt(position);
+                // flags
+                start = position;
+                while (currentChar === "i" || currentChar === "m") {
+                    position++;
+                    currentChar = path.charAt(position);
+                }
+                flags = path.substring(start, position) + "g";
+                return new RegExp(pattern, flags);
+            }
+            if (
+                (currentChar === "(" || currentChar === "[" || currentChar === "{") &&
+                path.charAt(position - 1) !== "\\"
+            ) {
+                depth++;
+            }
+            if (
+                (currentChar === ")" || currentChar === "]" || currentChar === "}") &&
+                path.charAt(position - 1) !== "\\"
+            ) {
+                depth--;
+            }
+
+            position++;
+        }
+        throw {
+            code: "S0302",
+            stack: new Error().stack,
+            position: position,
+        };
+    };
+
+    var next = (prefix: boolean) => {
+        if (position >= length) return null;
+        var currentChar = path.charAt(position);
+        // skip whitespace
+        while (position < length && " \t\n\r\v".indexOf(currentChar) > -1) {
+            position++;
+            currentChar = path.charAt(position);
+        }
+        // test for regex
+        if (prefix !== true && currentChar === "/") {
+            position++;
+            return create("regex", scanRegex());
+        }
+        // handle double-char operators
+        if (currentChar === "." && path.charAt(position + 1) === ".") {
+            // double-dot .. range operator
+            position += 2;
+            return create("operator", "..");
+        }
+        if (currentChar === ":" && path.charAt(position + 1) === "=") {
+            // := assignment
+            position += 2;
+            return create("operator", ":=");
+        }
+        if (currentChar === "!" && path.charAt(position + 1) === "=") {
+            // !=
+            position += 2;
+            return create("operator", "!=");
+        }
+        if (currentChar === ">" && path.charAt(position + 1) === "=") {
+            // >=
+            position += 2;
+            return create("operator", ">=");
+        }
+        if (currentChar === "<" && path.charAt(position + 1) === "=") {
+            // <=
+            position += 2;
+            return create("operator", "<=");
+        }
+        if (currentChar === "*" && path.charAt(position + 1) === "*") {
+            // **  descendant wildcard
+            position += 2;
+            return create("operator", "**");
+        }
+        if (currentChar === "~" && path.charAt(position + 1) === ">") {
+            // ~>  chain function
+            position += 2;
+            return create("operator", "~>");
+        }
+        // test for single char operators
+        if (operators.hasOwnProperty(currentChar)) {
+            position++;
+            return create("operator", currentChar);
+        }
+        // test for string literals
+        if (currentChar === '"' || currentChar === "'") {
+            var quoteType = currentChar;
+            // double quoted string literal - find end of string
+            position++;
+            var qstr = "";
+            while (position < length) {
+                currentChar = path.charAt(position);
+                if (currentChar === "\\") {
+                    // escape sequence
+                    position++;
+                    currentChar = path.charAt(position);
+                    if (escapes.hasOwnProperty(currentChar)) {
+                        qstr += escapes[currentChar];
+                    } else if (currentChar === "u") {
+                        // \u should be followed by 4 hex digits
+                        var octets = path.substr(position + 1, 4);
+                        if (/^[0-9a-fA-F]+$/.test(octets)) {
+                            var codepoint = parseInt(octets, 16);
+                            qstr += String.fromCharCode(codepoint);
+                            position += 4;
+                        } else {
+                            throw {
+                                code: "S0104",
+                                stack: new Error().stack,
+                                position: position,
+                            };
+                        }
+                    } else {
+                        // illegal escape sequence
+                        throw {
+                            code: "S0103",
+                            stack: new Error().stack,
+                            position: position,
+                            token: currentChar,
+                        };
+                    }
+                } else if (currentChar === quoteType) {
+                    position++;
+                    return create("string", qstr);
+                } else {
+                    qstr += currentChar;
+                }
+                position++;
+            }
+            throw {
+                code: "S0101",
+                stack: new Error().stack,
+                position: position,
+            };
+        }
+        // test for numbers
+        var numregex = /^-?(0|([1-9][0-9]*))(\.[0-9]+)?([Ee][-+]?[0-9]+)?/;
+        var match = numregex.exec(path.substring(position));
+        if (match !== null) {
+            var num = parseFloat(match[0]);
+            if (!isNaN(num) && isFinite(num)) {
+                position += match[0].length;
+                return create("number", num);
+            } else {
+                throw {
+                    code: "S0102",
+                    stack: new Error().stack,
+                    position: position,
+                    token: match[0],
+                };
+            }
+        }
+        // test for quoted names (backticks)
+        var name;
+        if (currentChar === "`") {
+            // scan for closing quote
+            position++;
+            var end = path.indexOf("`", position);
+            if (end !== -1) {
+                name = path.substring(position, end);
+                position = end + 1;
+                return create("name", name);
+            }
+            position = length;
+            throw {
+                code: "S0105",
+                stack: new Error().stack,
+                position: position,
+            };
+        }
+        // test for names
+        var i = position;
+        var ch;
+        for (;;) {
+            ch = path.charAt(i);
+            if (i === length || " \t\n\r\v".indexOf(ch) > -1 || operators.hasOwnProperty(ch)) {
+                if (path.charAt(position) === "$") {
+                    // variable reference
+                    name = path.substring(position + 1, i);
+                    position = i;
+                    return create("variable", name);
+                } else {
+                    name = path.substring(position, i);
+                    position = i;
+                    switch (name) {
+                        case "or":
+                        case "in":
+                        case "and":
+                            return create("operator", name);
+                        case "true":
+                            return create("value", true);
+                        case "false":
+                            return create("value", false);
+                        case "null":
+                            return create("value", null);
+                        default:
+                            if (position === length && name === "") {
+                                // whitespace at end of input
+                                return null;
+                            }
+                            return create("name", name);
+                    }
+                }
+            } else {
+                i++;
+            }
+        }
+    };
+
+    return next;
+}
diff --git a/src/utils.ts b/src/utils.ts
new file mode 100644
index 00000000..4dead091
--- /dev/null
+++ b/src/utils.ts
@@ -0,0 +1,259 @@
+import { errorCodes } from "./constants";
+
+/**
+ *
+ * @param {Object} arg - expression to test
+ * @returns {boolean} - true if it is a function (lambda or built-in)
+ */
+export function isFunction(arg) {
+    return (arg && (arg._jsonata_function === true || arg._jsonata_lambda === true)) || typeof arg === "function";
+}
+
+/**
+ * Tests whether arg is a lambda function
+ * @param {*} arg - the value to test
+ * @returns {boolean} - true if it is a lambda function
+ */
+export function isLambda(arg) {
+    return arg && arg._jsonata_lambda === true;
+}
+
+/**
+ * @param {Object} arg - expression to test
+ * @returns {boolean} - true if it is a generator i.e. the result from calling a
+ * generator function
+ */
+export function isGenerator(arg) {
+    return (
+        typeof arg === "object" &&
+        arg !== null &&
+        Symbol.iterator in arg &&
+        typeof arg[Symbol.iterator] === "function" &&
+        "next" in arg &&
+        typeof arg.next === "function"
+    );
+}
+
+/**
+ * Check if value is a finite number
+ * @param {float} n - number to evaluate
+ * @returns {boolean} True if n is a finite number
+ */
+export function isNumeric(n) {
+    var isNum = false;
+    if (typeof n === "number") {
+        // TODO: This used to be num = parseFloat(n)...but I didn't see the point of that.
+        var num = n;
+        isNum = !isNaN(num);
+        if (isNum && !isFinite(num)) {
+            throw {
+                code: "D1001",
+                value: n,
+                stack: new Error().stack,
+            };
+        }
+    }
+    return isNum;
+}
+
+/**
+ * Returns true if the arg is an array of strings
+ * @param {*} arg - the item to test
+ * @returns {boolean} True if arg is an array of strings
+ */
+export function isArrayOfStrings(arg) {
+    var result = false;
+    /* istanbul ignore else */
+    if (Array.isArray(arg)) {
+        result =
+            arg.filter(function(item) {
+                return typeof item !== "string";
+            }).length === 0;
+    }
+    return result;
+}
+
+/**
+ * Returns true if the arg is an array of numbers
+ * @param {*} arg - the item to test
+ * @returns {boolean} True if arg is an array of numbers
+ */
+export function isArrayOfNumbers(arg) {
+    var result = false;
+    if (Array.isArray(arg)) {
+        result =
+            arg.filter(function(item) {
+                return !isNumeric(item);
+            }).length === 0;
+    }
+    return result;
+}
+
+/**
+ * Returns a flattened array
+ * @param {Array} arg - the array to be flatten
+ * @param {Array} flattened - carries the flattened array - if not defined, will initialize to []
+ * @returns {Array} - the flattened array
+ */
+export function flatten(arg, flattened?) {
+    if (typeof flattened === "undefined") {
+        flattened = [];
+    }
+    if (Array.isArray(arg)) {
+        arg.forEach(function(item) {
+            flatten(item, flattened);
+        });
+    } else {
+        flattened.push(arg);
+    }
+    return flattened;
+}
+
+/**
+ * Create frame
+ * @param {Object} enclosingEnvironment - Enclosing environment
+ * @returns {{bind: bind, lookup: lookup}} Created frame
+ */
+export function createFrame(enclosingEnvironment) {
+    var bindings = {};
+    return {
+        bind: function(name, value) {
+            bindings[name] = value;
+        },
+        lookup: function(name) {
+            var value;
+            if (bindings.hasOwnProperty(name)) {
+                value = bindings[name];
+            } else if (enclosingEnvironment) {
+                value = enclosingEnvironment.lookup(name);
+            }
+            return value;
+        },
+    };
+}
+
+/**
+ * Create an empty sequence to contain query results
+ * @returns {Array} - empty sequence
+ */
+export function createSequence(foo?) {
+    var sequence = toSequence([]);
+    if (arguments.length === 1) {
+        sequence.push(arguments[0]);
+    }
+    return sequence;
+}
+
+/**
+ * Converts an array to a result sequence (by adding special properties)
+ * @param {Array} arr - the array to convert
+ * @returns {*} - the sequence
+ */
+export function toSequence(arr) {
+    Object.defineProperty(arr, "sequence", {
+        enumerable: false,
+        configurable: false,
+        get: function() {
+            return true;
+        },
+    });
+    Object.defineProperty(arr, "keepSingleton", {
+        enumerable: false,
+        configurable: false,
+        writable: true,
+        value: false,
+    });
+    Object.defineProperty(arr, "value", {
+        enumerable: false,
+        configurable: false,
+        get: function() {
+            return function(this: typeof arr) {
+                switch (this.length) {
+                    case 0:
+                        return undefined;
+                    case 1:
+                        return this.keepSingleton ? this : this[0];
+                    default:
+                        return this;
+                }
+            };
+        },
+    });
+    return arr;
+}
+
+/**
+ * lookup a message template from the catalog and substitute the inserts
+ * @param {string} err - error code to lookup
+ * @returns {string} message
+ */
+export function lookupMessage(err) {
+    var message = "Unknown error";
+    if (typeof err.message !== "undefined") {
+        message = err.message;
+    }
+    var template = errorCodes[err.code];
+    if (typeof template !== "undefined") {
+        // if there are any handlebars, replace them with the field references
+        // triple braces - replace with value
+        // double braces - replace with json stringified value
+        message = template.replace(/\{\{\{([^}]+)}}}/g, function() {
+            return err[arguments[1]];
+        });
+        message = message.replace(/\{\{([^}]+)}}/g, function() {
+            return JSON.stringify(err[arguments[1]]);
+        });
+    }
+    return message;
+}
+
+/**
+ * Protect the process/browser from a runnaway expression
+ * i.e. Infinite loop (tail recursion), or excessive stack growth
+ *
+ * @param {Object} expr - expression to protect
+ * @param {Number} timeout - max time in ms
+ * @param {Number} maxDepth - max stack depth
+ */
+export function timeboxExpression(expr, timeout, maxDepth) {
+    var depth = 0;
+    var time = Date.now();
+
+    var checkRunnaway = function() {
+        if (depth > maxDepth) {
+            // stack too deep
+            throw {
+                message:
+                    "Stack overflow error: Check for non-terminating recursive function.  Consider rewriting as tail-recursive.",
+                stack: new Error().stack,
+                code: "U1001"
+            };
+        }
+        if (Date.now() - time > timeout) {
+            // expression has run for too long
+            throw {
+                message: "Expression evaluation timeout: Check for infinite loop",
+                stack: new Error().stack,
+                code: "U1001"
+            };
+        }
+    };
+
+    // register callbacks
+    expr.assign("__evaluate_entry", function() {
+        depth++;
+        checkRunnaway();
+    });
+    expr.assign("__evaluate_exit", function() {
+        depth--;
+        checkRunnaway();
+    });
+}
+
+// Polyfill
+/* istanbul ignore next */
+Number.isInteger =
+    Number.isInteger ||
+    function(value) {
+        return typeof value === "number" && isFinite(value) && Math.floor(value) === value;
+    };
diff --git a/src/visitor.ts b/src/visitor.ts
new file mode 100644
index 00000000..747e3f02
--- /dev/null
+++ b/src/visitor.ts
@@ -0,0 +1,57 @@
+import * as ast from "./ast";
+
+export interface Visitor {
+    visitWildcard?: (node: ast.WildcardNode) => void;
+    visitDescendant?: (node: ast.DescendantNode) => void;
+    visitError?: (node: ast.ErrorNode) => void;
+    visitVariable?: (node: ast.VariableNode) => void;
+    visitName?: (node: ast.NameNode) => void;
+    visitLiteral?: (node: ast.LiteralNode) => void;
+    visitRegex?: (node: ast.RegexNode) => void;
+    visitOperator?: (node: ast.OperatorNode) => void;
+    visitEnd?: (node: ast.EndNode) => void;
+    enterUnary?: (node: ast.UnaryNode) => void;
+    exitUnary?: (node: ast.UnaryNode) => void;
+    enterBinary?: (node: ast.BinaryNode) => void;
+    exitBinary?: (node: ast.BinaryNode) => void;
+    enterBinaryObject?: (node: ast.BinaryObjectNode) => void;
+    exitBinaryObject?: (node: ast.BinaryObjectNode) => void;
+    enterSort?: (node: ast.BinaryObjectNode) => void;
+    exitSort?: (node: ast.BinaryObjectNode) => void;
+    enterTernary?: (node: ast.TernaryNode) => void;
+    exitTernary?: (node: ast.TernaryNode) => void;
+    enterBlock?: (node: ast.BlockNode) => void;
+    exitBlock?: (node: ast.BlockNode) => void;
+    enterTransform?: (node: ast.TransformNode) => void;
+    exitTransform?: (node: ast.TransformNode) => void;
+    enterFunction?: (node: ast.FunctionInvocationNode) => void;
+    exitFunction?: (node: ast.FunctionInvocationNode) => void;
+    enterLambda?: (node: ast.LambdaDefinitionNode) => void;
+    exitLambda?: (node: ast.LambdaDefinitionNode) => void;
+}
+
+export function throwNever(node: ast.ASTNode, x: never): never {
+    throw new Error("Unhandled node type: " + node.type + ": " + JSON.stringify(node));
+}
+
+export function walk(node: ast.ASTNode, visitor: Visitor): void {
+    let visit = <T extends ast.ASTNode>(f?: (node: T) => void) =>
+        void {
+            if(f) {
+                f(node);
+            },
+        };
+    switch (node.type) {
+        case "wildcard":
+            return visit(visitor.visitWildcard);
+        case "descendant":
+            return visit(visitor.visitDescendant);
+        case "error":
+            return visit(visitor.visitError);
+        case "variable":
+            return visit(visitor.visitVariable);
+        case "name":
+            return visit(visitor.visitName);
+    }
+    //return throwNever(node, node);
+}
diff --git a/test.out b/test.out
new file mode 100644
index 00000000..c7309a23
--- /dev/null
+++ b/test.out
@@ -0,0 +1,21056 @@
+yarn run v1.3.2
+$ jest
+PASS __tests__/async-function.ts
+  ● Console
+
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'httpget', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'httpget', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal',
+        value: 'https://api.npmjs.org/downloads/range/2016-09-01:2017-03-31/jsonata',
+        position: 78 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'https://api.npmjs.org/downloads/range/2016-09-01:2017-03-31/jsonata',
+        type: 'literal',
+        position: 78 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'downloads', position: 89 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'downloads', type: 'name', position: 89 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substring', position: 101 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substring', type: 'variable', position: 101 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'day', position: 105 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'day', type: 'name', position: 105 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 0, position: 108 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 0, type: 'literal', position: 108 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 7, position: 111 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 7, type: 'literal', position: 111 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'sum', position: 118 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'sum', type: 'variable', position: 118 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'downloads', position: 128 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'downloads', type: 'name', position: 128 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 5, position: 1 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 5, type: 'literal', position: 1 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'httpget', position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'httpget', type: 'variable', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal',
+        value: 'htttttps://api.npmjs.org/downloads/range/2016-09-01:2017-03-31/jsonata',
+        position: 85 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'htttttps://api.npmjs.org/downloads/range/2016-09-01:2017-03-31/jsonata',
+        type: 'literal',
+        position: 85 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'httpget', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'httpget', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal',
+        value: 'htttttps://api.npmjs.org/downloads/range/2016-09-01:2017-03-31/jsonata',
+        position: 81 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'htttttps://api.npmjs.org/downloads/range/2016-09-01:2017-03-31/jsonata',
+        type: 'literal',
+        position: 81 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'downloads', position: 92 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'downloads', type: 'name', position: 92 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substring', position: 104 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substring', type: 'variable', position: 104 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'day', position: 108 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'day', type: 'name', position: 108 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 0, position: 111 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 0, type: 'literal', position: 111 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 7, position: 114 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 7, type: 'literal', position: 114 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'sum', position: 121 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'sum', type: 'variable', position: 121 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'downloads', position: 131 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'downloads', type: 'name', position: 131 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'value', position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'value', type: 'name', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'value', position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'value', type: 'name', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'value', position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'value', type: 'name', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'value', position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'value', type: 'name', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'counter', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'counter', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 5, position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 5, type: 'literal', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'counter', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'counter', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 0, position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 0, type: 'literal', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'inc', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'inc', type: 'name', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'counter', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'counter', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 0, position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 0, type: 'literal', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'inc', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'inc', type: 'name', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'inc', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'inc', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'inc', position: 27 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'inc', type: 'name', position: 27 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'inc', position: 33 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'inc', type: 'name', position: 33 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'counter', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'counter', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 3, position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 3, type: 'literal', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 5, position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 5, type: 'literal', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'counter', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'counter', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 0, position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 0, type: 'literal', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'inc', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'inc', type: 'name', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'inc', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'inc', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'inc', position: 27 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'inc', type: 'name', position: 27 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'inc', position: 33 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'inc', type: 'name', position: 33 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 3, position: 39 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 3, type: 'literal', position: 39 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'counter', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'counter', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'counter', position: 17 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'counter', type: 'variable', position: 17 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 3, position: 19 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 3, type: 'literal', position: 19 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'inc', position: 24 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'inc', type: 'name', position: 24 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'inc', position: 30 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'inc', type: 'name', position: 30 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'inc', position: 37 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'inc', type: 'name', position: 37 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'counter', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'counter', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 3, position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 3, type: 'literal', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'inc', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'inc', type: 'name', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'string', position: 25 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'string', type: 'variable', position: 25 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'counter', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'counter', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 2, position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'inc', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'inc', type: 'name', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 21 }
+
+PASS __tests__/parser-recovery.ts
+  ● Console
+
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 0, position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 0, type: 'literal', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: undefined, value: '(end)', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { id: '(end)',
+        lbp: 0,
+        value: '(end)',
+        nud: [Function],
+        position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: undefined, value: '(end)', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { id: '(end)',
+        lbp: 0,
+        value: '(end)',
+        nud: [Function],
+        position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 0, position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 0, type: 'literal', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 0, position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 0, type: 'literal', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 24 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 24 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'equals3lucy', position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'equals3lucy', type: 'variable', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 0, position: 14 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 0, type: 'literal', position: 14 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'UnstructuredAnswers', position: 35 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'UnstructuredAnswers', type: 'name', position: 35 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: undefined, value: '(end)', position: 46 }
+    console.log src/parser/parser.ts:79
+      ret =  { id: '(end)',
+        lbp: 0,
+        value: '(end)',
+        nud: [Function],
+        position: 46 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: undefined, value: '(end)', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { id: '(end)',
+        lbp: 0,
+        value: '(end)',
+        nud: [Function],
+        position: 8 }
+
+PASS __tests__/implementation-tests.ts (5.161s)
+  ● Console
+
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'millis', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'millis', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'now', position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'now', type: 'literal', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'millis', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'millis', type: 'variable', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'delay', position: 26 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'delay', type: 'literal', position: 26 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'sum', position: 32 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'sum', type: 'variable', position: 32 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 35 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 35 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 10000, position: 42 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 10000, type: 'literal', position: 42 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'later', position: 53 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'later', type: 'literal', position: 53 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'millis', position: 62 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'millis', type: 'variable', position: 62 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'now', position: 70 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'now', type: 'name', position: 70 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'later', position: 78 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'later', type: 'name', position: 78 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'sum', position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'sum', type: 'variable', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 10000, position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 10000, type: 'literal', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'millis', position: 26 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'millis', type: 'variable', position: 26 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'now', position: 4 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'now', type: 'variable', position: 4 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'now', position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'now', type: 'literal', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'now', position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'now', type: 'variable', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'delay', position: 23 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'delay', type: 'literal', position: 23 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'sum', position: 29 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'sum', type: 'variable', position: 29 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 32 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 32 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 10000, position: 39 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 10000, type: 'literal', position: 39 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'later', position: 50 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'later', type: 'literal', position: 50 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'now', position: 56 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'now', type: 'variable', position: 56 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'now', position: 64 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'now', type: 'name', position: 64 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'later', position: 72 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'later', type: 'name', position: 72 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'sum', position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'sum', type: 'variable', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 10000, position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 10000, type: 'literal', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'now', position: 23 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'now', type: 'variable', position: 23 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'millis', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'millis', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'random', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'random', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'random', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'random', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'random', position: 19 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'random', type: 'variable', position: 19 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 17 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 17 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Product', position: 28 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'literal', position: 28 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'blah', position: 35 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'blah', type: 'literal', position: 35 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'nomatch', position: 44 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'nomatch', type: 'name', position: 44 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'function', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'function', type: 'name', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'f', position: 11 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'f', type: 'variable', position: 11 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'g', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'g', type: 'variable', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'function', position: 27 }
+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 10, type: 'literal', position: 20 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'inf', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'inf', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'function', position: 19 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'function', type: 'name', position: 19 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'n', position: 22 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'n', type: 'variable', position: 22 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'n', position: 26 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'n', type: 'variable', position: 26 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'inf', position: 31 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'inf', type: 'variable', position: 31 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'n', position: 34 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'n', type: 'variable', position: 34 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 36 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 36 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'inf', position: 45 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'inf', type: 'variable', position: 45 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 5, position: 47 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 5, type: 'literal', position: 47 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'inf', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'inf', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'function', position: 19 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'function', type: 'name', position: 19 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'inf', position: 26 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'inf', type: 'variable', position: 26 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'inf', position: 36 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'inf', type: 'variable', position: 36 }
+
+PASS __tests__/run-test-suite.ts (9.608s)
+  ● Console
+
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 2 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 2 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 2 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 2 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 2, position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 2 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 2 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 2, position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 3, position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 3, type: 'literal', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 2 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 2 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 2, position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 3, position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 3, type: 'literal', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 4, position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 4, type: 'literal', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 2 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 2 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'two', position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'two', type: 'literal', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'three', position: 19 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'three', type: 'literal', position: 19 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 4, position: 22 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 4, type: 'literal', position: 22 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 2 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 2 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'two', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'two', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'three', position: 18 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'three', type: 'literal', position: 18 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'four', position: 25 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'four', type: 'variable', position: 25 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'foo.bar', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo.bar', type: 'literal', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'bar', position: 19 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'bar', type: 'name', position: 19 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'foo.baz', position: 31 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo.baz', type: 'literal', position: 31 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 36 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 36 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'blah', position: 41 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'blah', type: 'name', position: 41 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'baz', position: 45 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'baz', type: 'name', position: 45 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 2 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 2 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 2, position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 3, position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 3, type: 'literal', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 0, position: 11 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 0, type: 'literal', position: 11 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 2 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 2 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 2, position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 3, position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 3, type: 'literal', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 4, position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 4, type: 'literal', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 17 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 17 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 2 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 2 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 2, position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 3, position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 3, type: 'literal', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 4, position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 4, type: 'literal', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 17 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 17 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'blah', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'blah', type: 'name', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'baz', position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'baz', type: 'name', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'fud', position: 17 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'fud', type: 'name', position: 17 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'fud', position: 22 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'fud', type: 'name', position: 22 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'blah', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'blah', type: 'name', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'baz', position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'baz', type: 'name', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'fud', position: 18 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'fud', type: 'name', position: 18 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'fud', position: 23 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'fud', type: 'name', position: 23 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'blah', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'blah', type: 'name', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'baz', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'baz', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'fud', position: 18 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'fud', type: 'name', position: 18 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'blah', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'blah', type: 'name', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'baz', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'baz', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'buz', position: 18 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'buz', type: 'name', position: 18 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'fud', position: 23 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'fud', type: 'name', position: 23 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Address', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Address', type: 'name', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Other', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Other', type: 'name', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Alternative.Address', position: 37 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Alternative.Address', type: 'literal', position: 37 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'City', position: 43 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'City', type: 'name', position: 43 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Address', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Address', type: 'name', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Other', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Other', type: 'name', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Alternative.Address', position: 37 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Alternative.Address', type: 'name', position: 37 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'City', position: 43 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'City', type: 'name', position: 43 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 0, position: 2 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 0, type: 'literal', position: 2 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 4 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 4 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 2, position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 3, position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 3, type: 'literal', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 4, position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 4, type: 'literal', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 5, position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 5, type: 'literal', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 6, position: 14 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 6, type: 'literal', position: 14 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 7, position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 7, type: 'literal', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 8, position: 18 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 8, type: 'literal', position: 18 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 9, position: 20 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 9, type: 'literal', position: 20 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: '', position: 23 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '', type: 'variable', position: 23 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 2, position: 27 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 27 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 0, position: 31 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 0, type: 'literal', position: 31 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 2 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 2 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 2, position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 3, position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 3, type: 'literal', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: '', position: 11 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '', type: 'variable', position: 11 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 2 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 2 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 2, position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 3, position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 3, type: 'literal', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: '', position: 11 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '', type: 'variable', position: 11 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 2 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 2 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 2, position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 3, position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 3, type: 'literal', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: '', position: 11 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '', type: 'variable', position: 11 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 2 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 2 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 2, position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 3, position: 8 }
+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 90 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 90 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Account', position: 104 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'literal', position: 104 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'AccName', position: 114 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'AccName', type: 'variable', position: 114 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'SKU-', position: 127 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'SKU-', type: 'literal', position: 127 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'string', position: 137 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'string', type: 'variable', position: 137 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'ProductID', position: 147 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'ProductID', type: 'name', position: 147 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product Name', position: 164 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product Name', type: 'name', position: 164 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 3, position: 1 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 3, type: 'literal', position: 1 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 3, position: 4 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 3, type: 'literal', position: 4 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 3, position: 1 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 3, type: 'literal', position: 1 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 3, position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 3, type: 'literal', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 3, position: 1 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 3, type: 'literal', position: 1 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 3, position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 3, type: 'literal', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '3', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '3', type: 'literal', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '3', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '3', type: 'literal', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '3', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '3', type: 'literal', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 3, position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 3, type: 'literal', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'hello', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'hello', type: 'literal', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'hello', position: 17 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'hello', type: 'literal', position: 17 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'hello', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'hello', type: 'literal', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'world', position: 18 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'world', type: 'literal', position: 18 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'hello', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'hello', type: 'literal', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'world', position: 17 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'world', type: 'literal', position: 17 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '32', position: 4 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '32', type: 'literal', position: 4 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 42, position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 42, type: 'literal', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: null, position: 4 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: null, type: 'literal', position: 4 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'world', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'world', type: 'literal', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 3, position: 1 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 3, type: 'literal', position: 1 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: true, position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: true, type: 'literal', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'bar', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'bar', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'bar', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'bar', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'bar', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'bar', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'bar', position: 14 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'bar', type: 'name', position: 14 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'bar', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'bar', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'bar', position: 11 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'bar', type: 'name', position: 11 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'bar', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'bar', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'bar', position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'bar', type: 'name', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'bar', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'bar', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'bar', position: 11 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'bar', type: 'name', position: 11 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'bar', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'bar', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'bar', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'bar', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'bar', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'bar', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'bar', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'bar', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'bar', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'bar', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'bar', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'bar', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'bar', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'bar', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'bar', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'bar', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 56, position: 18 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 56, type: 'literal', position: 18 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'bar', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'bar', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'bar', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'bar', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 56, position: 18 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 56, type: 'literal', position: 18 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'blah', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'blah', type: 'name', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'baz', position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'baz', type: 'name', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'fud', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'fud', type: 'name', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'hello', position: 26 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'hello', type: 'literal', position: 26 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'blah', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'blah', type: 'name', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'baz', position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'baz', type: 'name', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'fud', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'fud', type: 'name', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'world', position: 27 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'world', type: 'literal', position: 27 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 27 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 27 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 30, position: 32 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 30, type: 'literal', position: 32 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 39 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 39 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 27 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 27 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: '', position: 29 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '', type: 'variable', position: 29 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 35, position: 33 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 35, type: 'literal', position: 33 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Red', position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Red', type: 'literal', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: '$', position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '$', type: 'variable', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Bus', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Bus', type: 'literal', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'White', position: 25 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'White', type: 'literal', position: 25 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: '$', position: 28 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '$', type: 'variable', position: 28 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Police Car', position: 41 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Police Car', type: 'literal', position: 41 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 0, position: 45 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 0, type: 'literal', position: 45 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Red', position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Red', type: 'literal', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: '$', position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '$', type: 'variable', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Bus', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Bus', type: 'literal', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'White', position: 25 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'White', type: 'literal', position: 25 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: '$', position: 28 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '$', type: 'variable', position: 28 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Police Car', position: 41 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Police Car', type: 'literal', position: 41 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 0, position: 45 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 0, type: 'literal', position: 45 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Red', position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Red', type: 'literal', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: '$', position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '$', type: 'variable', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Bus', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Bus', type: 'literal', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'White', position: 25 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'White', type: 'literal', position: 25 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: '$', position: 28 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '$', type: 'variable', position: 28 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Police Car', position: 41 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Police Car', type: 'literal', position: 41 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 0, position: 45 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 0, type: 'literal', position: 45 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'lookup', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'lookup', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Bus', position: 14 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Bus', type: 'literal', position: 14 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Red', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Red', type: 'literal', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Police Car', position: 35 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Police Car', type: 'literal', position: 35 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'White', position: 44 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'White', type: 'literal', position: 44 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: '$', position: 49 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '$', type: 'variable', position: 49 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'lookup', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'lookup', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Bus', position: 14 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Bus', type: 'literal', position: 14 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Red', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Red', type: 'literal', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Police Car', position: 35 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Police Car', type: 'literal', position: 35 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'White', position: 44 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'White', type: 'literal', position: 44 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: '$', position: 49 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '$', type: 'variable', position: 49 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'lookup', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'lookup', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Bus', position: 14 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Bus', type: 'literal', position: 14 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Red', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Red', type: 'literal', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Police Car', position: 35 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Police Car', type: 'literal', position: 35 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'White', position: 44 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'White', type: 'literal', position: 44 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: '$', position: 49 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '$', type: 'variable', position: 49 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 28 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 28 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 30, position: 33 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 30, type: 'literal', position: 33 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Cheap', position: 43 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Cheap', type: 'literal', position: 43 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 28 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 28 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 30, position: 33 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 30, type: 'literal', position: 33 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Cheap', position: 43 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Cheap', type: 'literal', position: 43 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Expensive', position: 57 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Expensive', type: 'literal', position: 57 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 28 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 28 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 30, position: 33 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 30, type: 'literal', position: 33 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Cheap', position: 43 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Cheap', type: 'literal', position: 43 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 51 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 51 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 100, position: 57 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 100, type: 'literal', position: 57 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Expensive', position: 71 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Expensive', type: 'literal', position: 71 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Rip off', position: 83 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Rip off', type: 'literal', position: 83 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'number', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'number', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 2 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 2 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 5, position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 5, type: 'literal', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'string', position: 14 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'string', type: 'variable', position: 14 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 2 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 2 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 5, position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 5, type: 'literal', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Item ', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Item ', type: 'literal', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'string', position: 25 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'string', type: 'variable', position: 25 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Product Name', position: 36 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product Name', type: 'literal', position: 36 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'uppercase', position: 47 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'uppercase', type: 'variable', position: 47 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substringBefore', position: 66 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substringBefore', type: 'variable', position: 66 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: ' ', position: 70 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: ' ', type: 'literal', position: 70 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'blah', position: 11 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'blah', type: 'name', position: 11 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'baz', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'baz', type: 'name', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'fud', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'fud', type: 'name', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'foo', position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'literal', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'fud', position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'fud', type: 'name', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'fud', position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'fud', type: 'literal', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'foo', position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'literal', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'fud', position: 14 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'fud', type: 'literal', position: 14 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'fud', position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'fud', type: 'name', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'fud', position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'fud', type: 'name', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Colour', position: 23 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Colour', type: 'name', position: 23 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'fud', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'fud', type: 'name', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 0, position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 0, type: 'literal', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 4 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 4 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'fud', position: 11 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'fud', type: 'name', position: 11 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 0, position: 14 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 0, type: 'literal', position: 14 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'fud', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'fud', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 0, position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 0, type: 'literal', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 0, position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 0, type: 'literal', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 0, position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 0, type: 'literal', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 2, position: 4 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 4 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'blah', position: 18 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'blah', type: 'name', position: 18 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'base64encode', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'base64encode', type: 'variable', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'hello:world', position: 27 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'hello:world', type: 'literal', position: 27 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'base64encode', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'base64encode', type: 'variable', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'base64decode', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'base64decode', type: 'variable', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'aGVsbG86d29ybGQ=', position: 32 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'aGVsbG86d29ybGQ=', type: 'literal', position: 32 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'base64decode', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'base64decode', type: 'variable', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 's', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 's', type: 'literal', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 1 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 1 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: null, position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: null, type: 'literal', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 's', position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 's', type: 'literal', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'unknown', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'unknown', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'function', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'function', type: 'name', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'sum', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'sum', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 11 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 11 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 17 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 17 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'OrderID', position: 25 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'OrderID', type: 'name', position: 25 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 2 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 2 }
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+      ret =  { value: 3, type: 'literal', position: 17 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 4, type: 'literal', position: 15 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'append', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'notexist', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'notexist', type: 'name', position: 16 }
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 3, type: 'literal', position: 22 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+      alt =  { type: 'name', value: 'OrderID', position: 24 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'OrderID', type: 'name', position: 24 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'uppercase', type: 'variable', position: 38 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'g', type: 'variable', position: 15 }
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'function', type: 'name', position: 27 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'x', type: 'variable', position: 30 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'g', type: 'variable', position: 35 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'f', type: 'variable', position: 38 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'x', type: 'variable', position: 41 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
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+      alt =  { type: 'name', value: 'OrderID', position: 24 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'OrderID', type: 'name', position: 24 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'lowercase', type: 'variable', position: 54 }
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'f', type: 'variable', position: 11 }
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+      ret =  { value: 'g', type: 'variable', position: 15 }
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+      ret =  { value: 'f', type: 'variable', position: 38 }
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+      ret =  { value: 'g', type: 'variable', position: 15 }
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+      ret =  { value: 'function', type: 'name', position: 27 }
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+      alt =  { type: 'variable', value: 'x', position: 30 }
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+      ret =  { value: 'x', type: 'variable', position: 30 }
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'g', type: 'variable', position: 35 }
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'f', type: 'variable', position: 38 }
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'x', type: 'variable', position: 41 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'OrderID', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'OrderID', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'join', position: 30 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'join', type: 'variable', position: 30 }
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'f', type: 'variable', position: 11 }
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'g', type: 'variable', position: 15 }
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+      ret =  { value: 'x', type: 'variable', position: 30 }
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'x', type: 'variable', position: 41 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'OrderID', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'OrderID', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'join', position: 30 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'join', type: 'variable', position: 30 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: ', ', position: 35 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: ', ', type: 'literal', position: 35 }
+    console.log src/parser/parser.ts:78
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+      ret =  { value: 'function', type: 'name', position: 8 }
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+      alt =  { type: 'variable', value: 'f', position: 11 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'f', type: 'variable', position: 11 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'g', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'g', type: 'variable', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'function', position: 27 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'function', type: 'name', position: 27 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'x', position: 30 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'x', type: 'variable', position: 30 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'g', position: 35 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'g', type: 'variable', position: 35 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'f', position: 38 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'f', type: 'variable', position: 38 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'x', position: 41 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'x', type: 'variable', position: 41 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 28 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 28 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Quantity', position: 39 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Quantity', type: 'name', position: 39 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'sum', position: 48 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'sum', type: 'variable', position: 48 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'function', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'function', type: 'name', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'f', position: 11 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'f', type: 'variable', position: 11 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'g', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'g', type: 'variable', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'function', position: 27 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'function', type: 'name', position: 27 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'x', position: 30 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'x', type: 'variable', position: 30 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'g', position: 35 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'g', type: 'variable', position: 35 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'f', position: 38 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'f', type: 'variable', position: 38 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'x', position: 41 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'x', type: 'variable', position: 41 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'uppertrim', position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'uppertrim', type: 'variable', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'trim', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'trim', type: 'variable', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'uppercase', position: 35 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'uppercase', type: 'variable', position: 35 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'uppertrim', position: 48 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'uppertrim', type: 'variable', position: 48 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '   Hello    World   ', position: 71 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '   Hello    World   ', type: 'literal', position: 71 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'function', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'function', type: 'name', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'f', position: 11 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'f', type: 'variable', position: 11 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'g', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'g', type: 'variable', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'function', position: 27 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'function', type: 'name', position: 27 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'x', position: 30 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'x', type: 'variable', position: 30 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'g', position: 35 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'g', type: 'variable', position: 35 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'f', position: 38 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'f', type: 'variable', position: 38 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'x', position: 41 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'x', type: 'variable', position: 41 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'john@example.com', position: 18 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'john@example.com', type: 'literal', position: 18 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substringAfter', position: 37 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substringAfter', type: 'variable', position: 37 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '@', position: 41 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '@', type: 'literal', position: 41 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substringBefore', position: 62 }
+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'g', type: 'variable', position: 15 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
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+      ret =  { value: 'substringBefore', type: 'variable', position: 46 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'x', type: 'variable', position: 30 }
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'f', type: 'variable', position: 11 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'g', type: 'variable', position: 15 }
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'function', type: 'name', position: 27 }
+    console.log src/parser/parser.ts:78
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+      ret =  { value: 'x', type: 'variable', position: 30 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'g', type: 'variable', position: 35 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'f', type: 'variable', position: 38 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'x', type: 'variable', position: 41 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substringAfter', position: 22 }
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+      ret =  { value: 'substringAfter', type: 'variable', position: 22 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: '@', type: 'literal', position: 26 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substringBefore', position: 47 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substringBefore', type: 'variable', position: 47 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: '.', type: 'literal', position: 51 }
+    console.log src/parser/parser.ts:78
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+      ret =  { value: 'x', type: 'variable', position: 30 }
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'f', type: 'variable', position: 11 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'g', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'g', type: 'variable', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'function', position: 27 }
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+      ret =  { value: 'function', type: 'name', position: 27 }
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+      ret =  { value: 'x', type: 'variable', position: 30 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'g', type: 'variable', position: 35 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'f', type: 'variable', position: 38 }
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+    console.log src/parser/parser.ts:78
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+      ret =  { value: 'domain', type: 'variable', position: 9 }
+    console.log src/parser/parser.ts:78
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+      ret =  { value: 'substringAfter', type: 'variable', position: 28 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+      ret =  { value: 'substringBefore', type: 'variable', position: 55 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: '.', type: 'literal', position: 61 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'domain', position: 71 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'domain', type: 'variable', position: 71 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'john@example.com', position: 90 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'john@example.com', type: 'literal', position: 90 }
+    console.log src/parser/parser.ts:78
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+      ret =  { value: 'x', type: 'variable', position: 30 }
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+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: '_', position: 25 }
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+      ret =  { value: '_', type: 'name', position: 25 }
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: '_', position: 25 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '_', type: 'name', position: 25 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'square', position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'square', type: 'variable', position: 9 }
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+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'square', position: 56 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'square', type: 'variable', position: 56 }
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+      ret =  { value: 'x', type: 'variable', position: 41 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'square', type: 'variable', position: 9 }
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+      ret =  { value: 5, type: 'literal', position: 39 }
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+    console.log src/parser/parser.ts:78
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+      alt =  { type: 'variable', value: 'boolean', position: 8 }
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'boolean', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'hello', position: 17 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'hello', type: 'literal', position: 17 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'world', position: 25 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'world', type: 'literal', position: 25 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'boolean', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'boolean', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'boolean', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 22 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 22 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 30 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 30 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 36 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 36 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'boolean', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'boolean', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'blah', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'blah', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
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+      alt =  { type: 'literal', value: 3.7, position: 10 }
+    console.log src/parser/parser.ts:79
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+      ret =  { value: 'ceil', type: 'variable', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'nothing', position: 13 }
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+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 10 }
+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'clone', position: 6 }
+    console.log src/parser/parser.ts:79
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+      ret =  { value: 'contains', type: 'variable', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Hello World', position: 23 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Hello World', type: 'literal', position: 23 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'lo', position: 29 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'lo', type: 'literal', position: 29 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'contains', position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'contains', type: 'variable', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Hello World', position: 23 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Hello World', type: 'literal', position: 23 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'World', position: 32 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'World', type: 'literal', position: 32 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'contains', position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'contains', type: 'variable', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Hello World', position: 23 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Hello World', type: 'literal', position: 23 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'world', position: 32 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'world', type: 'literal', position: 32 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'contains', position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'contains', type: 'variable', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Hello World', position: 23 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Hello World', type: 'literal', position: 23 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Word', position: 31 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Word', type: 'literal', position: 31 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'contains', position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'contains', type: 'variable', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'nothing', position: 17 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'nothing', type: 'name', position: 17 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'World', position: 26 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'World', type: 'literal', position: 26 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'contains', position: 9 }
+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 3, position: 15 }
+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'contains', position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'contains', type: 'variable', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '23', position: 14 }
+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 3, type: 'literal', position: 17 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'count', position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'count', type: 'variable', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 14 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 14 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 20 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 20 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 28 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 28 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 35 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 35 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Quantity', position: 46 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Quantity', type: 'name', position: 46 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'count', position: 20 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'count', type: 'variable', position: 20 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 28 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 28 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 35 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 35 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Quantity', position: 46 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Quantity', type: 'name', position: 46 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'OrderID', position: 22 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'OrderID', type: 'name', position: 22 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: ': ', type: 'literal', position: 29 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'count', position: 38 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'count', type: 'variable', position: 38 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 46 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 46 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 53 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 53 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Quantity', position: 62 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Quantity', type: 'name', position: 62 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'count', position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'count', type: 'variable', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'count', position: 6 }
+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: '#0%%', type: 'literal', position: 23 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'formatNumber', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'formatNumber', type: 'variable', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 20, position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 20, type: 'literal', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '#0‰‰', position: 23 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '#0‰‰', type: 'literal', position: 23 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'formatNumber', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'formatNumber', type: 'variable', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 20, position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 20, type: 'literal', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '#0%‰', position: 23 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '#0%‰', type: 'literal', position: 23 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'formatNumber', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'formatNumber', type: 'variable', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 20, position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 20, type: 'literal', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '.e0', position: 22 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '.e0', type: 'literal', position: 22 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'formatNumber', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'formatNumber', type: 'variable', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 20, position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 20, type: 'literal', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '0+.e0', position: 24 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '0+.e0', type: 'literal', position: 24 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'formatNumber', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'formatNumber', type: 'variable', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 20, position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 20, type: 'literal', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '0,.e0', position: 24 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '0,.e0', type: 'literal', position: 24 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'formatNumber', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'formatNumber', type: 'variable', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 20, position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 20, type: 'literal', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '0,', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '0,', type: 'literal', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'formatNumber', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'formatNumber', type: 'variable', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 20, position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 20, type: 'literal', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '0,,0', position: 23 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '0,,0', type: 'literal', position: 23 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'formatNumber', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'formatNumber', type: 'variable', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 20, position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 20, type: 'literal', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '0#.e0', position: 24 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '0#.e0', type: 'literal', position: 24 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'formatNumber', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'formatNumber', type: 'variable', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 20, position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 20, type: 'literal', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '#0.#0e0', position: 26 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '#0.#0e0', type: 'literal', position: 26 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'formatNumber', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'formatNumber', type: 'variable', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 20, position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 20, type: 'literal', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '#0.0e0%', position: 26 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '#0.0e0%', type: 'literal', position: 26 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'formatNumber', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'formatNumber', type: 'variable', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 20, position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 20, type: 'literal', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '#0.0e0,0', position: 27 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '#0.0e0,0', type: 'literal', position: 27 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'fromMillis', position: 11 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'fromMillis', type: 'variable', position: 11 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'fromMillis', position: 11 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'fromMillis', type: 'variable', position: 11 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1509380732935, position: 25 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1509380732935, type: 'literal', position: 25 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'fromMillis', position: 11 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'fromMillis', type: 'variable', position: 11 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'join', position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'join', type: 'variable', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'hello', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'hello', type: 'literal', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'join', position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'join', type: 'variable', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'hello', position: 14 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'hello', type: 'literal', position: 14 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'join', position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'join', type: 'variable', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'hello', position: 14 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'hello', type: 'literal', position: 14 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'world', position: 23 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'world', type: 'literal', position: 23 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'join', position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'join', type: 'variable', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'hello', position: 14 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'hello', type: 'literal', position: 14 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'world', position: 23 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'world', type: 'literal', position: 23 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: ', ', position: 30 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: ', ', type: 'literal', position: 30 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'join', position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'join', type: 'variable', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: ', ', position: 14 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: ', ', type: 'literal', position: 14 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'join', position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'join', type: 'variable', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 19 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 19 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 27 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 27 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Description', position: 39 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Description', type: 'name', position: 39 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Colour', position: 46 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Colour', type: 'name', position: 46 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: ', ', position: 52 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: ', ', type: 'literal', position: 52 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'join', position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'join', type: 'variable', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 19 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 19 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 27 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 27 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Description', position: 39 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Description', type: 'name', position: 39 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Colour', position: 46 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Colour', type: 'name', position: 46 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'no', position: 50 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'no', type: 'name', position: 50 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'sep', position: 54 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'sep', type: 'name', position: 54 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'join', position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'join', type: 'variable', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'blah', position: 18 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'blah', type: 'name', position: 18 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 26 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 26 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Description', position: 38 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Description', type: 'name', position: 38 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Colour', position: 45 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Colour', type: 'name', position: 45 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: ', ', position: 51 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: ', ', type: 'literal', position: 51 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'join', position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'join', type: 'variable', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: true, position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: true, type: 'literal', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: ', ', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: ', ', type: 'literal', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'join', position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'join', type: 'variable', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 8 }
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+      alt =  { type: 'literal', value: 2, position: 10 }
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+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 3, position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 3, type: 'literal', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: ', ', position: 19 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: ', ', type: 'literal', position: 19 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'join', position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'join', type: 'variable', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'hello', position: 14 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'hello', type: 'literal', position: 14 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 3, position: 18 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 3, type: 'literal', position: 18 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'join', position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'join', type: 'variable', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'keys', position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'keys', type: 'variable', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'keys', position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'keys', type: 'variable', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 19 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 19 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 27 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 27 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'keys', position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'keys', type: 'variable', position: 5 }
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+      alt =  { type: 'variable', value: 'keys', position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'keys', type: 'variable', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'foo', position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'literal', position: 12 }
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+      alt =  { type: 'variable', value: 'keys', position: 5 }
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+      ret =  { value: 'keys', type: 'variable', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'foo', position: 11 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'literal', position: 11 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'keys', position: 5 }
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+      ret =  { value: 'keys', type: 'variable', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'foo', position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'literal', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'bar', position: 19 }
+    console.log src/parser/parser.ts:79
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+      ret =  { value: 'length', type: 'variable', position: 7 }
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+      alt =  { type: 'variable', value: 'length', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'length', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'hello', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'hello', type: 'literal', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'length', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'length', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'missing', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'missing', type: 'name', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'length', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'length', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'λ-calculus', position: 25 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'λ-calculus', type: 'literal', position: 25 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'length', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'length', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '𝄞', position: 22 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '𝄞', type: 'literal', position: 22 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'length', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'length', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '𝄞', position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '𝄞', type: 'literal', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'length', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'length', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '超明體繁', position: 14 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '超明體繁', type: 'literal', position: 14 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'length', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'length', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '\t', position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '\t', type: 'literal', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'length', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'length', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '\n', position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '\n', type: 'literal', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'length', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'length', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1234, position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1234, type: 'literal', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'length', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'length', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: null, position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: null, type: 'literal', position: 12 }
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+      alt =  { type: 'variable', value: 'length', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'length', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: true, position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: true, type: 'literal', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'length', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'length', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'str', position: 14 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'str', type: 'literal', position: 14 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'length', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'length', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'length', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'length', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'length', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'length', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Hello', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Hello', type: 'literal', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'World', position: 24 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'World', type: 'literal', position: 24 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'lookup', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'lookup', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Account Name', position: 31 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account Name', type: 'literal', position: 31 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'lookup', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'lookup', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 29 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 29 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Product Name', position: 45 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product Name', type: 'literal', position: 45 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'lookup', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'lookup', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 29 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 29 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'ProductID', position: 39 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'ProductID', type: 'name', position: 39 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Product Name', position: 55 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product Name', type: 'literal', position: 55 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'lookup', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'lookup', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: '$', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '$', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'gust', position: 18 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'gust', type: 'literal', position: 18 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'lowercase', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'lowercase', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Hello World', position: 24 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Hello World', type: 'literal', position: 24 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'lowercase', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'lowercase', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'blah', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'blah', type: 'name', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'max', position: 4 }
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+      ret =  { value: 'max', type: 'variable', position: 4 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 18 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 18 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 26 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 26 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 33 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 33 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Quantity', position: 44 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Quantity', type: 'name', position: 44 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'max', position: 18 }
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+      ret =  { value: 'max', type: 'variable', position: 18 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 26 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 26 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 33 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 33 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Quantity', position: 44 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Quantity', type: 'name', position: 44 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'OrderID', position: 22 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'OrderID', type: 'name', position: 22 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: ': ', position: 29 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: ': ', type: 'literal', position: 29 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'count', position: 38 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'count', type: 'variable', position: 38 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 46 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 46 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 53 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 53 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Quantity', position: 62 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Quantity', type: 'name', position: 62 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'max', position: 4 }
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+      ret =  { value: 'max', type: 'variable', position: 4 }
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+      alt =  { type: 'variable', value: 'max', position: 4 }
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+      ret =  { value: 'max', type: 'variable', position: 4 }
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+      alt =  { type: 'literal', value: 1, position: 7 }
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+      ret =  { value: 1, type: 'literal', position: 7 }
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+      alt =  { type: 'literal', value: 2, position: 9 }
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+      ret =  { value: 2, type: 'literal', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 3, position: 11 }
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+      ret =  { value: 3, type: 'literal', position: 11 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'max', position: 4 }
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+      ret =  { value: 'max', type: 'variable', position: 4 }
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+      alt =  { type: 'literal', value: '1', position: 9 }
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+      ret =  { value: '1', type: 'literal', position: 9 }
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+      alt =  { type: 'literal', value: '2', position: 13 }
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+      ret =  { value: '2', type: 'literal', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '3', position: 17 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '3', type: 'literal', position: 17 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'max', position: 4 }
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+      ret =  { value: 'max', type: 'variable', position: 4 }
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+      alt =  { type: 'literal', value: '1', position: 9 }
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+      ret =  { value: '1', type: 'literal', position: 9 }
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+      alt =  { type: 'literal', value: '2', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '2', type: 'literal', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 3, position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 3, type: 'literal', position: 15 }
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+      ret =  { value: 'max', type: 'variable', position: 4 }
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+      alt =  { type: 'literal', value: 1, position: 6 }
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+      ret =  { value: 1, type: 'literal', position: 6 }
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+      alt =  { type: 'variable', value: 'max', position: 4 }
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+      ret =  { value: 'max', type: 'variable', position: 4 }
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+      alt =  { type: 'literal', value: 1, position: 8 }
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+      ret =  { value: 1, type: 'literal', position: 8 }
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+      alt =  { type: 'literal', value: 5, position: 11 }
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+      ret =  { value: 5, type: 'literal', position: 11 }
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+      alt =  { type: 'variable', value: 'max', position: 4 }
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+      ret =  { value: 'max', type: 'variable', position: 4 }
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+      alt =  { type: 'variable', value: 'max', position: 4 }
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+      ret =  { value: 'max', type: 'variable', position: 4 }
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+      alt =  { type: 'literal', value: 1, position: 7 }
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+      alt =  { type: 'variable', value: 'max', position: 4 }
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+      ret =  { value: 'max', type: 'variable', position: 4 }
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+      ret =  { value: 1, type: 'literal', position: 7 }
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+      alt =  { type: 'variable', value: 'max', position: 4 }
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+      ret =  { value: 'max', type: 'variable', position: 4 }
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+      alt =  { type: 'name', value: 'undefined', position: 14 }
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+      ret =  { value: 'undefined', type: 'name', position: 14 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'min', position: 4 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'min', type: 'variable', position: 4 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 18 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 18 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 26 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 26 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 33 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 33 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Quantity', position: 44 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Quantity', type: 'name', position: 44 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'min', position: 18 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'min', type: 'variable', position: 18 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 26 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 26 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 33 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 33 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Quantity', position: 44 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Quantity', type: 'name', position: 44 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'OrderID', position: 22 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'OrderID', type: 'name', position: 22 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: ': ', position: 29 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: ': ', type: 'literal', position: 29 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'min', position: 36 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'min', type: 'variable', position: 36 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 44 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 44 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 51 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 51 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Quantity', position: 60 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Quantity', type: 'name', position: 60 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'min', position: 4 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'min', type: 'variable', position: 4 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'min', position: 4 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'min', type: 'variable', position: 4 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 2, position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 3, position: 11 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 3, type: 'literal', position: 11 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'min', position: 4 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'min', type: 'variable', position: 4 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '1', position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '1', type: 'literal', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '2', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '2', type: 'literal', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '3', position: 17 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '3', type: 'literal', position: 17 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'min', position: 4 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'min', type: 'variable', position: 4 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '1', position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '1', type: 'literal', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '2', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '2', type: 'literal', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 3, position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 3, type: 'literal', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'min', position: 4 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'min', type: 'variable', position: 4 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'min', position: 4 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'min', type: 'variable', position: 4 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'min', position: 4 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'min', type: 'variable', position: 4 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 2, position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 3, position: 11 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 3, type: 'literal', position: 11 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'min', position: 4 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'min', type: 'variable', position: 4 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'min', position: 4 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'min', type: 'variable', position: 4 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 2, position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'min', position: 4 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'min', type: 'variable', position: 4 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'undefined', position: 14 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'undefined', type: 'name', position: 14 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'merge', position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'merge', type: 'variable', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'nothing', position: 14 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'nothing', type: 'name', position: 14 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'merge', position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'merge', type: 'variable', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'a', position: 11 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'a', type: 'literal', position: 11 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'merge', position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'merge', type: 'variable', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'a', position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'a', type: 'literal', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 14 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 14 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'b', type: 'literal', position: 21 }
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+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'merge', position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'merge', type: 'variable', position: 6 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'a', type: 'literal', position: 12 }
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+      ret =  { value: 1, type: 'literal', position: 15 }
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'merge', position: 6 }
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'b', position: 22 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'b', type: 'literal', position: 22 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 2, position: 25 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 25 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'a', position: 30 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'a', type: 'literal', position: 30 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 3, type: 'literal', position: 33 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'number', position: 7 }
+    console.log src/parser/parser.ts:79
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+      alt =  { type: 'variable', value: 'number', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'number', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'number', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'number', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 0.05, position: 13 }
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+      ret =  { value: 0.05, type: 'literal', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'number', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'number', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'number', position: 7 }
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+      ret =  { value: 'number', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '-0.05', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '-0.05', type: 'literal', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'number', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'number', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '1e2', position: 13 }
+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'number', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'number', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '1.0e-2', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '1.0e-2', type: 'literal', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'number', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'number', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '1e0', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '1e0', type: 'literal', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'number', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'number', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '10e500', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '10e500', type: 'literal', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'number', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'number', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Hello world', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Hello world', type: 'literal', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'number', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'number', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '1/2', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '1/2', type: 'literal', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'number', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'number', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '1234 hello', position: 20 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '1234 hello', type: 'literal', position: 20 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'number', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'number', type: 'variable', position: 7 }
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+      alt =  { type: 'variable', value: 'number', position: 7 }
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+      ret =  { value: 'number', type: 'variable', position: 7 }
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+      ret =  { value: true, type: 'literal', position: 12 }
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+      alt =  { type: 'variable', value: 'number', position: 7 }
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+      ret =  { value: 'number', type: 'variable', position: 7 }
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+      alt =  { type: 'variable', value: 'number', position: 7 }
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+      ret =  { value: 'number', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'blah', position: 20 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'blah', type: 'name', position: 20 }
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'number', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'number', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'number', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'number', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'hello', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'hello', type: 'literal', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'world', position: 24 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'world', type: 'literal', position: 24 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'number', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'number', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'number', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'number', type: 'variable', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'number', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'number', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'function', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'function', type: 'name', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 5, position: 20 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 5, type: 'literal', position: 20 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'number', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'number', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 2, position: 11 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 11 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'pad', position: 4 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'pad', type: 'variable', position: 4 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'foo', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'literal', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 5, position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 5, type: 'literal', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'pad', position: 4 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'pad', type: 'variable', position: 4 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'foo', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'literal', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 5, position: 14 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 5, type: 'literal', position: 14 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'pad', position: 4 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'pad', type: 'variable', position: 4 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'foo', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'literal', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 5, position: 14 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 5, type: 'literal', position: 14 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '#', position: 19 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '#', type: 'literal', position: 19 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'pad', position: 4 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'pad', type: 'variable', position: 4 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'foo', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'literal', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 5, position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 5, type: 'literal', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '', position: 17 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '', type: 'literal', position: 17 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'pad', position: 4 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'pad', type: 'variable', position: 4 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'foo', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'literal', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'pad', position: 4 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'pad', type: 'variable', position: 4 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'foo', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'literal', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 8, position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 8, type: 'literal', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '-+', position: 19 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '-+', type: 'literal', position: 19 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'pad', position: 4 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'pad', type: 'variable', position: 4 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'nothing', position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'nothing', type: 'name', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'power', position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'power', type: 'variable', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 4, position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 4, type: 'literal', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 2, position: 11 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 11 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'power', position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'power', type: 'variable', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 4, position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 4, type: 'literal', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 0.5, position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 0.5, type: 'literal', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'power', position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'power', type: 'variable', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 10, position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 10, type: 'literal', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 2, position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'power', position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'power', type: 'variable', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 2, position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 3, position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 3, type: 'literal', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'power', position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'power', type: 'variable', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'nothing', position: 14 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'nothing', type: 'name', position: 14 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 3, position: 17 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 3, type: 'literal', position: 17 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'power', position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'power', type: 'variable', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 2, position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 3, position: 14 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 3, type: 'literal', position: 14 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'power', position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'power', type: 'variable', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 100, position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 100, type: 'literal', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1000, position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1000, type: 'literal', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'replace', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'replace', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Hello World', position: 22 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Hello World', type: 'literal', position: 22 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'World', position: 31 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'World', type: 'literal', position: 31 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Everyone', position: 43 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Everyone', type: 'literal', position: 43 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'replace', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'replace', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal',
+        value: 'the cat sat on the mat',
+        position: 33 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'the cat sat on the mat',
+        type: 'literal',
+        position: 33 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'at', position: 39 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'at', type: 'literal', position: 39 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'it', position: 45 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'it', type: 'literal', position: 45 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'replace', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'replace', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal',
+        value: 'the cat sat on the mat',
+        position: 33 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'the cat sat on the mat',
+        type: 'literal',
+        position: 33 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'at', position: 39 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'at', type: 'literal', position: 39 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'it', position: 45 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'it', type: 'literal', position: 45 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 0, position: 48 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 0, type: 'literal', position: 48 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'replace', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'replace', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal',
+        value: 'the cat sat on the mat',
+        position: 33 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'the cat sat on the mat',
+        type: 'literal',
+        position: 33 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'at', position: 39 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'at', type: 'literal', position: 39 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'it', position: 45 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'it', type: 'literal', position: 45 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 2, position: 48 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 48 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'replace', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'replace', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'nothing', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'nothing', type: 'name', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'at', position: 22 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'at', type: 'literal', position: 22 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'it', position: 28 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'it', type: 'literal', position: 28 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 2, position: 31 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 31 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'replace', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'replace', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'hello', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'hello', type: 'literal', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'replace', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'replace', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'hello', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'hello', type: 'literal', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'l', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'l', type: 'literal', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '1', position: 26 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '1', type: 'literal', position: 26 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: null, position: 32 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: null, type: 'literal', position: 32 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'replace', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'replace', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'hello', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'hello', type: 'literal', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'l', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'l', type: 'literal', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '1', position: 26 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '1', type: 'literal', position: 26 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 2, position: 30 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 30 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'replace', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'replace', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'hello', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'hello', type: 'literal', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 19 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 19 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'replace', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'replace', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'hello', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'hello', type: 'literal', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '', position: 20 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '', type: 'literal', position: 20 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'bye', position: 27 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'bye', type: 'literal', position: 27 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'replace', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'replace', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'hello', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'hello', type: 'literal', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 2, position: 19 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 19 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 22 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 22 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'replace', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'replace', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 123, position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 123, type: 'literal', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 2, position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 18 }
+    console.log src/parser/parser.ts:79
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+        value: '1970-01-01T00:00:00.001Z',
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+        value: '2017-10-30T16:25:32.935Z',
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+        type: 'literal',
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+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 13 }
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'join', type: 'variable', position: 29 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'arr', position: 34 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'arr', type: 'variable', position: 34 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'sep', position: 40 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'sep', type: 'variable', position: 40 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'a', position: 46 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'a', type: 'literal', position: 46 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'λ', position: 1 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'λ', type: 'name', position: 1 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'arr', position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'arr', type: 'variable', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'sep', position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'sep', type: 'variable', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'join', position: 29 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'join', type: 'variable', position: 29 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'arr', position: 34 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'arr', type: 'variable', position: 34 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'sep', position: 40 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'sep', type: 'variable', position: 40 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'a', position: 47 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'a', type: 'literal', position: 47 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'λ', position: 1 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'λ', type: 'name', position: 1 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'arr', position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'arr', type: 'variable', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'sep', position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'sep', type: 'variable', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'join', position: 29 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'join', type: 'variable', position: 29 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'arr', position: 34 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'arr', type: 'variable', position: 34 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'sep', position: 40 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'sep', type: 'variable', position: 40 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'a', position: 46 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'a', type: 'literal', position: 46 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '-', position: 51 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '-', type: 'literal', position: 51 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'λ', position: 1 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'λ', type: 'name', position: 1 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'arr', position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'arr', type: 'variable', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'sep', position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'sep', type: 'variable', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'join', position: 29 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'join', type: 'variable', position: 29 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'arr', position: 34 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'arr', type: 'variable', position: 34 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'sep', position: 40 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'sep', type: 'variable', position: 40 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'a', position: 47 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'a', type: 'literal', position: 47 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '-', position: 53 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '-', type: 'literal', position: 53 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'λ', position: 1 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'λ', type: 'name', position: 1 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'arr', position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'arr', type: 'variable', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'sep', position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'sep', type: 'variable', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'join', position: 29 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'join', type: 'variable', position: 29 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'arr', position: 34 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'arr', type: 'variable', position: 34 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'sep', position: 40 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'sep', type: 'variable', position: 40 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'a', position: 47 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'a', type: 'literal', position: 47 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'b', position: 52 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'b', type: 'literal', position: 52 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '-', position: 58 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '-', type: 'literal', position: 58 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'λ', position: 1 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'λ', type: 'name', position: 1 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'arr', position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'arr', type: 'variable', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'sep', position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'sep', type: 'variable', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'join', position: 26 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'join', type: 'variable', position: 26 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'arr', position: 31 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'arr', type: 'variable', position: 31 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'sep', position: 37 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'sep', type: 'variable', position: 37 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'a', position: 44 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'a', type: 'literal', position: 44 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'b', position: 49 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'b', type: 'literal', position: 49 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '-', position: 55 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '-', type: 'literal', position: 55 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'λ', position: 1 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'λ', type: 'name', position: 1 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'arr', position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'arr', type: 'variable', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'sep', position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'sep', type: 'variable', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'join', position: 29 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'join', type: 'variable', position: 29 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'arr', position: 34 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'arr', type: 'variable', position: 34 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'sep', position: 40 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'sep', type: 'variable', position: 40 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '-', position: 50 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '-', type: 'literal', position: 50 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'λ', position: 1 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'λ', type: 'name', position: 1 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'arr', position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'arr', type: 'variable', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'sep', position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'sep', type: 'variable', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'join', position: 29 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'join', type: 'variable', position: 29 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'arr', position: 34 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'arr', type: 'variable', position: 34 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'sep', position: 40 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'sep', type: 'variable', position: 40 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 46 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 46 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '-', position: 51 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '-', type: 'literal', position: 51 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'λ', position: 1 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'λ', type: 'name', position: 1 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'obj', position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'obj', type: 'variable', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'obj', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'obj', type: 'variable', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'hello', position: 25 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'hello', type: 'literal', position: 25 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'world', position: 34 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'world', type: 'literal', position: 34 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'λ', position: 1 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'λ', type: 'name', position: 1 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'arr', position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'arr', type: 'variable', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'arr', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'arr', type: 'variable', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 26 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 26 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'λ', position: 1 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'λ', type: 'name', position: 1 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'num', position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'num', type: 'variable', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'number', position: 24 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'number', type: 'variable', position: 24 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'num', position: 29 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'num', type: 'variable', position: 29 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 5, position: 33 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 5, type: 'literal', position: 33 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'λ', position: 1 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'λ', type: 'name', position: 1 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'num', position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'num', type: 'variable', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'number', position: 24 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'number', type: 'variable', position: 24 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'num', position: 29 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'num', type: 'variable', position: 29 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '5', position: 35 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '5', type: 'literal', position: 35 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 2 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 2 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 5, position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 5, type: 'literal', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'λ', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'λ', type: 'name', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'num', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'num', type: 'variable', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'number', position: 31 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'number', type: 'variable', position: 31 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'num', position: 36 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'num', type: 'variable', position: 36 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'twice', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'twice', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'function', position: 19 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'function', type: 'name', position: 19 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'f', position: 22 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'f', type: 'variable', position: 22 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'function', position: 37 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'function', type: 'name', position: 37 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'x', position: 40 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'x', type: 'variable', position: 40 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'f', position: 49 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'f', type: 'variable', position: 49 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'f', position: 52 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'f', type: 'variable', position: 52 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'x', position: 55 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'x', type: 'variable', position: 55 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'add2', position: 65 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'add2', type: 'variable', position: 65 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'function', position: 77 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'function', type: 'name', position: 77 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'x', position: 80 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'x', type: 'variable', position: 80 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'x', position: 89 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'x', type: 'variable', position: 89 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 2, position: 91 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 91 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'add4', position: 98 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'add4', type: 'variable', position: 98 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'twice', position: 108 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'twice', type: 'variable', position: 108 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'add2', position: 114 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'add2', type: 'variable', position: 114 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'add4', position: 121 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'add4', type: 'variable', position: 121 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 5, position: 123 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 5, type: 'literal', position: 123 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'twice', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'twice', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'function', position: 19 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'function', type: 'name', position: 19 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'f', position: 22 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'f', type: 'variable', position: 22 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'function', position: 47 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'function', type: 'name', position: 47 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'x', position: 50 }
+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Quantity', type: 'name', position: 122 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+      ret =  { value: 'a, b, c, d', type: 'literal', position: 19 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: true, position: 25 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: true, type: 'literal', position: 25 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 12345, position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 12345, type: 'literal', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 3, position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 3, type: 'literal', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'split', position: 6 }
+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 12345, position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 12345, type: 'literal', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'spread', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'spread', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Hello World', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Hello World', type: 'literal', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'spread', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'spread', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 22 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 22 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 30 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 30 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Description', position: 42 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Description', type: 'name', position: 42 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'spread', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'spread', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'blah', position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'blah', type: 'name', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'string', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'string', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'spread', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'spread', type: 'variable', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'function', position: 24 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'function', type: 'name', position: 24 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'x', position: 27 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'x', type: 'variable', position: 27 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'x', position: 31 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'x', type: 'variable', position: 31 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'x', position: 34 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'x', type: 'variable', position: 34 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'sqrt', position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'sqrt', type: 'variable', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 4, position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 4, type: 'literal', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'sqrt', position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'sqrt', type: 'variable', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 2, position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'sqrt', position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'sqrt', type: 'variable', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'nothing', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'nothing', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'sqrt', position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'sqrt', type: 'variable', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 2, position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'string', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'string', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 5, position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 5, type: 'literal', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'string', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'string', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 22, position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 22, type: 'literal', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 7, position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 7, type: 'literal', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'string', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'string', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1e+100, position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1e+100, type: 'literal', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'string', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'string', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1e-100, position: 14 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1e-100, type: 'literal', position: 14 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'string', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'string', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 0.000001, position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 0.000001, type: 'literal', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'string', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'string', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1e-7, position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1e-7, type: 'literal', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'string', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'string', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 100000000000000000000, position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 100000000000000000000, type: 'literal', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'string', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'string', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1e+21, position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1e+21, type: 'literal', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'string', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'string', type: 'variable', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'sum', position: 26 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'sum', type: 'variable', position: 26 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 34 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 34 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 41 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 41 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Quantity', position: 51 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Quantity', type: 'name', position: 51 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'string', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'string', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: true, position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: true, type: 'literal', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'string', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'string', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: false, position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: false, type: 'literal', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'string', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'string', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: null, position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: null, type: 'literal', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'string', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'string', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'blah', position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'blah', type: 'name', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'string', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'string', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'string', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'string', type: 'variable', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'string', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'string', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'function', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'function', type: 'name', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: true, position: 23 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: true, type: 'literal', position: 23 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'string', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'string', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'function', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'function', type: 'name', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 20 }
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+      ret =  { value: 1, type: 'literal', position: 20 }
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+      alt =  { type: 'variable', value: 'string', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'string', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'string', position: 17 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'string', type: 'literal', position: 17 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'hello', position: 26 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'hello', type: 'literal', position: 26 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'string', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'string', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'string', position: 17 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'string', type: 'literal', position: 17 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 5, position: 20 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 5, type: 'literal', position: 20 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'string', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'string', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'string', position: 19 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'string', type: 'literal', position: 19 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'hello', position: 28 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'hello', type: 'literal', position: 28 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'number', position: 39 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'number', type: 'literal', position: 39 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 78.8, position: 45 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 78.8, type: 'literal', position: 45 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 2, position: 49 }
+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'null', position: 58 }
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+      alt =  { type: 'literal', value: null, position: 63 }
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+      ret =  { value: null, type: 'literal', position: 63 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'boolean', position: 75 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'boolean', type: 'literal', position: 75 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: false, position: 82 }
+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'function', position: 95 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'function', type: 'literal', position: 95 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'sum', position: 101 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'sum', type: 'variable', position: 101 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'lambda', position: 112 }
+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'function', type: 'name', position: 122 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: true, type: 'literal', position: 129 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'another', position: 164 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'another', type: 'literal', position: 164 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'lambda2', position: 178 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'lambda2', type: 'literal', position: 178 }
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 3, position: 11 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 3, type: 'literal', position: 11 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'string', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'string', type: 'variable', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substring', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substring', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'hello world', position: 24 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'hello world', type: 'literal', position: 24 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 0, position: 27 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 0, type: 'literal', position: 27 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 5, position: 30 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 5, type: 'literal', position: 30 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substring', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substring', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'hello world', position: 24 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'hello world', type: 'literal', position: 24 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 5, position: 28 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 5, type: 'literal', position: 28 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 5, position: 31 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 5, type: 'literal', position: 31 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substring', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substring', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'hello world', position: 24 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'hello world', type: 'literal', position: 24 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 6, position: 27 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 6, type: 'literal', position: 27 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substring', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substring', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'blah', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'blah', type: 'name', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 6, position: 18 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 6, type: 'literal', position: 18 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substringAfter', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substringAfter', type: 'variable', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Hello World', position: 29 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Hello World', type: 'literal', position: 29 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: ' ', position: 34 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: ' ', type: 'literal', position: 34 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substringAfter', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substringAfter', type: 'variable', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Hello World', position: 29 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Hello World', type: 'literal', position: 29 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'l', position: 34 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'l', type: 'literal', position: 34 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substringAfter', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substringAfter', type: 'variable', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Hello World', position: 29 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Hello World', type: 'literal', position: 29 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'f', position: 34 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'f', type: 'literal', position: 34 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substringAfter', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substringAfter', type: 'variable', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Hello World', position: 29 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Hello World', type: 'literal', position: 29 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'ld', position: 35 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'ld', type: 'literal', position: 35 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substringAfter', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substringAfter', type: 'variable', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'blah', position: 20 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'blah', type: 'name', position: 20 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'ld', position: 26 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'ld', type: 'literal', position: 26 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substringBefore', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substringBefore', type: 'variable', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Hello World', position: 30 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Hello World', type: 'literal', position: 30 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: ' ', position: 35 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: ' ', type: 'literal', position: 35 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substringBefore', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substringBefore', type: 'variable', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Hello World', position: 30 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Hello World', type: 'literal', position: 30 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'l', position: 35 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'l', type: 'literal', position: 35 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substringBefore', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substringBefore', type: 'variable', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Hello World', position: 30 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Hello World', type: 'literal', position: 30 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'f', position: 35 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'f', type: 'literal', position: 35 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substringBefore', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substringBefore', type: 'variable', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Hello World', position: 30 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Hello World', type: 'literal', position: 30 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'He', position: 36 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'He', type: 'literal', position: 36 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substringBefore', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substringBefore', type: 'variable', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'blah', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'blah', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'He', position: 27 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'He', type: 'literal', position: 27 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'sum', position: 4 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'sum', type: 'variable', position: 4 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 18 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 18 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 26 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 26 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 33 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 33 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Quantity', position: 44 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Quantity', type: 'name', position: 44 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'sum', position: 18 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'sum', type: 'variable', position: 18 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 26 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 26 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 33 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 33 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Quantity', position: 44 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Quantity', type: 'name', position: 44 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'OrderID', position: 22 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'OrderID', type: 'name', position: 22 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: ': ', position: 29 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: ': ', type: 'literal', position: 29 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'sum', position: 36 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'sum', type: 'variable', position: 36 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 44 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 44 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 51 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 51 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Quantity', position: 60 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Quantity', type: 'name', position: 60 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'sum', position: 4 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'sum', type: 'variable', position: 4 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'sum', position: 4 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'sum', type: 'variable', position: 4 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'sum', position: 4 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'sum', type: 'variable', position: 4 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 18 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 18 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'sum', position: 4 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'sum', type: 'variable', position: 4 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'undefined', position: 14 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'undefined', type: 'name', position: 14 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'trim', position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'trim', type: 'variable', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Hello World', position: 19 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Hello World', type: 'literal', position: 19 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'trim', position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'trim', type: 'variable', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal',
+        value: '   Hello  \n  \t World  \t ',
+        position: 32 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '   Hello  \n  \t World  \t ',
+        type: 'literal',
+        position: 32 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'trim', position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'trim', type: 'variable', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'uppercase', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'uppercase', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Hello World', position: 24 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Hello World', type: 'literal', position: 24 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'uppercase', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'uppercase', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'blah', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'blah', type: 'name', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'zip', position: 4 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'zip', type: 'variable', position: 4 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 2, position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 3, position: 11 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 3, type: 'literal', position: 11 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 4, position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 4, type: 'literal', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 5, position: 17 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 5, type: 'literal', position: 17 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 6, position: 19 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 6, type: 'literal', position: 19 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'zip', position: 4 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'zip', type: 'variable', position: 4 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 2, position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 3, position: 11 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 3, type: 'literal', position: 11 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 4, position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 4, type: 'literal', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 5, position: 17 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 5, type: 'literal', position: 17 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 6, position: 19 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 6, type: 'literal', position: 19 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 7, position: 23 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 7, type: 'literal', position: 23 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 8, position: 25 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 8, type: 'literal', position: 25 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 9, position: 27 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 9, type: 'literal', position: 27 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'zip', position: 4 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'zip', type: 'variable', position: 4 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 2, position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 3, position: 11 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 3, type: 'literal', position: 11 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 4, position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 4, type: 'literal', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 5, position: 17 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 5, type: 'literal', position: 17 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'bar', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'bar', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'bar', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'bar', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'bar', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'bar', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'bar', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'bar', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'bar', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'bar', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'bar', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'bar', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'bar', position: 19 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'bar', type: 'name', position: 19 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'bar', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'bar', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'bar', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'bar', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'bar', position: 19 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'bar', type: 'name', position: 19 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 24, position: 2 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 24, type: 'literal', position: 2 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'notexist', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'notexist', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'notexist', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'notexist', type: 'name', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 1 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 1 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1e+301, position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1e+301, type: 'literal', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1e+101, position: 18 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1e+101, type: 'literal', position: 18 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '5', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '5', type: 'literal', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '5', position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '5', type: 'literal', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'notexist', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'notexist', type: 'name', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'key', position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'key', type: 'literal', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'value', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'value', type: 'literal', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'one', position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'one', type: 'literal', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'two', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'two', type: 'literal', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 2, position: 19 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 19 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'one', position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'one', type: 'literal', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'two', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'two', type: 'literal', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 2, position: 19 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 19 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'two', position: 24 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'two', type: 'name', position: 24 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'one', position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'one', type: 'literal', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'two', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'two', type: 'literal', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'three', position: 26 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'three', type: 'literal', position: 26 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 3, position: 29 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 3, type: 'literal', position: 29 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'four', position: 37 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'four', type: 'literal', position: 37 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '4', position: 42 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '4', type: 'literal', position: 42 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'one', position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'one', type: 'literal', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'two', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'two', type: 'literal', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 3, position: 20 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 3, type: 'literal', position: 20 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'four', position: 28 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'four', type: 'literal', position: 28 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'test', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'test', type: 'literal', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'blah', position: 4 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'blah', type: 'name', position: 4 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'OrderID', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'OrderID', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 30 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 30 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Product Name', position: 45 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product Name', type: 'literal', position: 45 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'OrderID', position: 22 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'OrderID', type: 'name', position: 22 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 31 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 31 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Product Name', position: 46 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product Name', type: 'literal', position: 46 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'string', position: 29 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'string', type: 'variable', position: 29 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'ProductID', position: 39 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'ProductID', type: 'name', position: 39 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 47 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 47 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'string', position: 29 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'string', type: 'variable', position: 29 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'ProductID', position: 39 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'ProductID', type: 'name', position: 39 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 48 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 48 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 0, position: 51 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 0, type: 'literal', position: 51 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'string', position: 30 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'string', type: 'variable', position: 30 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'ProductID', position: 40 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'ProductID', type: 'name', position: 40 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 48 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 48 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'ProductID', position: 31 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'ProductID', type: 'name', position: 31 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Product Name', position: 47 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product Name', type: 'literal', position: 47 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'ProductID', position: 32 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'ProductID', type: 'name', position: 32 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Product Name', position: 48 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product Name', type: 'literal', position: 48 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'OrderID', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'OrderID', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'sum', position: 27 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'sum', type: 'variable', position: 27 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 35 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 35 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 42 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 42 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Quantity', position: 51 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Quantity', type: 'name', position: 51 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'OrderID', position: 22 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'OrderID', type: 'name', position: 22 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'sum', position: 28 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'sum', type: 'variable', position: 28 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 36 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 36 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 43 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 43 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Quantity', position: 52 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Quantity', type: 'name', position: 52 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: '', position: 23 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '', type: 'variable', position: 23 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Product Name', position: 38 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product Name', type: 'literal', position: 38 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 45 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 45 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: '', position: 48 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '', type: 'variable', position: 48 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Product Name', position: 63 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product Name', type: 'literal', position: 63 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 70 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 70 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product Name', position: 36 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product Name', type: 'name', position: 36 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 43 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 43 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product Name', position: 59 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product Name', type: 'name', position: 59 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 66 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 66 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'OrderID', position: 23 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'OrderID', type: 'name', position: 23 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'TotalPrice', position: 42 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'TotalPrice', type: 'literal', position: 42 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'sum', position: 47 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'sum', type: 'variable', position: 47 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 55 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 55 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 62 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 62 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Quantity', position: 73 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Quantity', type: 'name', position: 73 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Items', position: 87 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Items', type: 'literal', position: 87 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 96 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 96 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Product Name', position: 111 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product Name', type: 'literal', position: 111 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Order', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'literal', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 19 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 19 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 25 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 25 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'ID', position: 37 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'ID', type: 'literal', position: 37 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'OrderID', position: 46 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'OrderID', type: 'name', position: 46 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Product', position: 62 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'literal', position: 62 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 71 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 71 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Name', position: 89 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Name', type: 'literal', position: 89 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: '', position: 92 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '', type: 'variable', position: 92 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Product Name', position: 107 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product Name', type: 'literal', position: 107 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'SKU', position: 123 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'SKU', type: 'literal', position: 123 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'ProductID', position: 134 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'ProductID', type: 'name', position: 134 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Details', position: 154 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Details', type: 'literal', position: 154 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Weight', position: 177 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Weight', type: 'literal', position: 177 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Description', position: 190 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Description', type: 'name', position: 190 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Weight', position: 197 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Weight', type: 'name', position: 197 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Dimensions', position: 222 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Dimensions', type: 'literal', position: 222 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Description', position: 235 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Description', type: 'name', position: 235 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Width', position: 242 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Width', type: 'name', position: 242 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: ' x ', position: 250 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: ' x ', type: 'literal', position: 250 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Height', position: 259 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Height', type: 'name', position: 259 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: ' x ', position: 267 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: ' x ', type: 'literal', position: 267 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Depth', position: 275 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Depth', type: 'name', position: 275 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Total Price', position: 316 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Total Price', type: 'literal', position: 316 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'sum', position: 322 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'sum', type: 'variable', position: 322 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 330 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 330 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 337 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 337 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Quantity', position: 348 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Quantity', type: 'name', position: 348 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Order', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'literal', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 19 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 19 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 25 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 25 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'ID', position: 37 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'ID', type: 'literal', position: 37 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'OrderID', position: 46 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'OrderID', type: 'name', position: 46 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Product', position: 62 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'literal', position: 62 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 71 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 71 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Name', position: 89 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Name', type: 'literal', position: 89 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product Name', position: 105 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product Name', type: 'name', position: 105 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'SKU', position: 121 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'SKU', type: 'literal', position: 121 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'ProductID', position: 132 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'ProductID', type: 'name', position: 132 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Details', position: 152 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Details', type: 'literal', position: 152 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Weight', position: 175 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Weight', type: 'literal', position: 175 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Description', position: 188 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Description', type: 'name', position: 188 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Weight', position: 195 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Weight', type: 'name', position: 195 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Dimensions', position: 220 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Dimensions', type: 'literal', position: 220 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Description', position: 233 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Description', type: 'name', position: 233 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Width', position: 240 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Width', type: 'name', position: 240 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: ' x ', position: 248 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: ' x ', type: 'literal', position: 248 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Height', position: 257 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Height', type: 'name', position: 257 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: ' x ', position: 265 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: ' x ', type: 'literal', position: 265 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Depth', position: 273 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Depth', type: 'name', position: 273 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Total Price', position: 314 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Total Price', type: 'literal', position: 314 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'sum', position: 320 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'sum', type: 'variable', position: 320 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 328 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 328 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 335 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 335 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Quantity', position: 346 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Quantity', type: 'name', position: 346 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Phone', position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Phone', type: 'name', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'type', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'type', type: 'name', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'join', position: 17 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'join', type: 'variable', position: 17 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'number', position: 24 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'number', type: 'name', position: 24 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: ', ', position: 30 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: ', ', type: 'literal', position: 30 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'phone', position: 40 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'phone', type: 'literal', position: 40 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'number', position: 47 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'number', type: 'name', position: 47 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'blah', position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'blah', type: 'name', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'baz', position: 14 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'baz', type: 'name', position: 14 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'fud', position: 18 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'fud', type: 'name', position: 18 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'blah', position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'blah', type: 'name', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'baz', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'baz', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'fud', position: 18 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'fud', type: 'name', position: 18 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 4 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 4 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'blah', position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'blah', type: 'name', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'baz', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'baz', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'fud', position: 18 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'fud', type: 'name', position: 18 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'blah', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'blah', type: 'name', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'baz', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'baz', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'fud', position: 17 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'fud', type: 'name', position: 17 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 4 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 4 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'blah', position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'blah', type: 'name', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'baz', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'baz', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'fud', position: 17 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'fud', type: 'name', position: 17 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 4 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 4 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'blah', position: 11 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'blah', type: 'name', position: 11 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'baz', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'baz', type: 'name', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'fud', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'fud', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 4 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 4 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'blah', type: 'name', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'baz', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'baz', type: 'name', position: 15 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
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+      ret =  { value: 'x', type: 'variable', position: 30 }
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'y', type: 'variable', position: 33 }
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'add2', type: 'variable', position: 42 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'add2', type: 'variable', position: 64 }
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'first5', type: 'variable', position: 70 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+      ret =  { value: 'str', type: 'variable', position: 13 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Colour', position: 51 }
+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+      alt =  { type: 'name', value: 'Price', position: 73 }
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+      alt =  { type: 'name', value: 'foo', position: 3 }
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:78
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+      ret =  { value: 'foo', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'blah.baz', position: 14 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'blah.baz', type: 'literal', position: 14 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 3 }
+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:78
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+      ret =  { value: 20, type: 'literal', position: 12 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 22, type: 'literal', position: 16 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 5, position: 2 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 5, type: 'literal', position: 2 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 5 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
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+      ret =  { value: 5, type: 'literal', position: 11 }
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'blah', position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'blah', type: 'name', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'blah', position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'blah', type: 'name', position: 5 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'blah', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'blah', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1.1, position: 4 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1.1, type: 'literal', position: 4 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 2 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 5.5, position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 5.5, type: 'literal', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'split', position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'split', type: 'variable', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'ababbxabbcc', position: 20 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'ababbxabbcc', type: 'literal', position: 20 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'regex', value: /b+/g, position: 25 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: /b+/g, type: 'regex', position: 25 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'split', position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'split', type: 'variable', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'ababbxabbcc', position: 20 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'ababbxabbcc', type: 'literal', position: 20 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'regex', value: /b+/g, position: 25 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: /b+/g, type: 'regex', position: 25 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 2, position: 28 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 28 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'split', position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'split', type: 'variable', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'ababbxabbcc', position: 20 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'ababbxabbcc', type: 'literal', position: 20 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'regex', value: /d+/g, position: 25 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: /d+/g, type: 'regex', position: 25 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'contains', position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'contains', type: 'variable', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'ababbxabbcc', position: 23 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'ababbxabbcc', type: 'literal', position: 23 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'regex', value: /ab+/g, position: 29 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: /ab+/g, type: 'regex', position: 29 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'contains', position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'contains', type: 'variable', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'ababbxabbcc', position: 23 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'ababbxabbcc', type: 'literal', position: 23 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'regex', value: /ax+/g, position: 29 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: /ax+/g, type: 'regex', position: 29 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'contains', position: 31 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'contains', type: 'variable', position: 31 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: '', position: 33 }
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+      ret =  { value: '', type: 'variable', position: 33 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Product Name', position: 48 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product Name', type: 'literal', position: 48 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'regex', value: /hat/g, position: 55 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: /hat/g, type: 'regex', position: 55 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'ProductID', position: 67 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'ProductID', type: 'name', position: 67 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'contains', position: 31 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'contains', type: 'variable', position: 31 }
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+      alt =  { type: 'variable', value: '', position: 33 }
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+      ret =  { value: '', type: 'variable', position: 33 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Product Name', position: 48 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product Name', type: 'literal', position: 48 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'regex', value: /hat/gi, position: 56 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: /hat/gi, type: 'regex', position: 56 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'ProductID', position: 68 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'ProductID', type: 'name', position: 68 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'replace', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'replace', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'ababbxabbcc', position: 22 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'ababbxabbcc', type: 'literal', position: 22 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'regex', value: /b+/g, position: 27 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: /b+/g, type: 'regex', position: 27 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'yy', position: 33 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'yy', type: 'literal', position: 33 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'replace', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'replace', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'ababbxabbcc', position: 22 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'ababbxabbcc', type: 'literal', position: 22 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'regex', value: /b+/g, position: 27 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: /b+/g, type: 'regex', position: 27 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'yy', position: 33 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'yy', type: 'literal', position: 33 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 2, position: 36 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 36 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'replace', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'replace', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'ababbxabbcc', position: 22 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'ababbxabbcc', type: 'literal', position: 22 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'regex', value: /b+/g, position: 27 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: /b+/g, type: 'regex', position: 27 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'yy', position: 33 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'yy', type: 'literal', position: 33 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 0, position: 36 }
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+      ret =  { value: 0, type: 'literal', position: 36 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'replace', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'replace', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'ababbxabbcc', position: 22 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'ababbxabbcc', type: 'literal', position: 22 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'regex', value: /d+/g, position: 27 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: /d+/g, type: 'regex', position: 27 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'yy', position: 33 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'yy', type: 'literal', position: 33 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'replace', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'replace', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'John Smith', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'John Smith', type: 'literal', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'regex', value: /(\w+)\s(\w+)/g, position: 37 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: /(\w+)\s(\w+)/g, type: 'regex', position: 37 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '$2, $1', position: 47 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '$2, $1', type: 'literal', position: 47 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'replace', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'replace', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '265USD', position: 17 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '265USD', type: 'literal', position: 17 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'regex', value: /([0-9]+)USD/g, position: 32 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: /([0-9]+)USD/g, type: 'regex', position: 32 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '$$$1', position: 40 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '$$$1', type: 'literal', position: 40 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'replace', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'replace', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '265USD', position: 17 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '265USD', type: 'literal', position: 17 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'regex', value: /([0-9]+)USD/g, position: 32 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: /([0-9]+)USD/g, type: 'regex', position: 32 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '$w', position: 38 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '$w', type: 'literal', position: 38 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'replace', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'replace', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '265USD', position: 17 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '265USD', type: 'literal', position: 17 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'regex', value: /([0-9]+)USD/g, position: 32 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: /([0-9]+)USD/g, type: 'regex', position: 32 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '$0 -> $$$1', position: 46 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '$0 -> $$$1', type: 'literal', position: 46 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'replace', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'replace', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '265USD', position: 17 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '265USD', type: 'literal', position: 17 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'regex', value: /([0-9]+)USD/g, position: 32 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: /([0-9]+)USD/g, type: 'regex', position: 32 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '$0$1$2', position: 42 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '$0$1$2', type: 'literal', position: 42 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'replace', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'replace', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'abcd', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'abcd', type: 'literal', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'regex', value: /(ab)|(a)/g, position: 27 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: /(ab)|(a)/g, type: 'regex', position: 27 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '[1=$1][2=$2]', position: 43 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '[1=$1][2=$2]', type: 'literal', position: 43 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'replace', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'replace', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'abracadabra', position: 22 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'abracadabra', type: 'literal', position: 22 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'regex', value: /bra/g, position: 29 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: /bra/g, type: 'regex', position: 29 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '*', position: 34 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '*', type: 'literal', position: 34 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'replace', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'replace', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'abracadabra', position: 22 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'abracadabra', type: 'literal', position: 22 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'regex', value: /a.*a/g, position: 30 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: /a.*a/g, type: 'regex', position: 30 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '*', position: 35 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '*', type: 'literal', position: 35 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'replace', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'replace', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'abracadabra', position: 22 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'abracadabra', type: 'literal', position: 22 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'regex', value: /a.*?a/g, position: 31 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: /a.*?a/g, type: 'regex', position: 31 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '*', position: 36 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '*', type: 'literal', position: 36 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'replace', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'replace', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'abracadabra', position: 22 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'abracadabra', type: 'literal', position: 22 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'regex', value: /a/g, position: 27 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: /a/g, type: 'regex', position: 27 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '', position: 31 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '', type: 'literal', position: 31 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'replace', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'replace', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'abracadabra', position: 22 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'abracadabra', type: 'literal', position: 22 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'regex', value: /a(.)/g, position: 30 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: /a(.)/g, type: 'regex', position: 30 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'a$1$1', position: 39 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'a$1$1', type: 'literal', position: 39 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'replace', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'replace', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'abracadabra', position: 22 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'abracadabra', type: 'literal', position: 22 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'regex', value: /.*?/g, position: 29 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: /.*?/g, type: 'regex', position: 29 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '$1', position: 35 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '$1', type: 'literal', position: 35 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'replace', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'replace', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'AAAA', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'AAAA', type: 'literal', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'regex', value: /A+/g, position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: /A+/g, type: 'regex', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'b', position: 26 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'b', type: 'literal', position: 26 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'replace', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'replace', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'AAAA', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'AAAA', type: 'literal', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'regex', value: /A+?/g, position: 22 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: /A+?/g, type: 'regex', position: 22 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'b', position: 27 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'b', type: 'literal', position: 27 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'replace', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'replace', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'darted', position: 17 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'darted', type: 'literal', position: 17 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'regex', value: /^(.*?)d(.*)$/g, position: 33 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: /^(.*?)d(.*)$/g, type: 'regex', position: 33 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '$1c$2', position: 42 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '$1c$2', type: 'literal', position: 42 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'replace', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'replace', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'abcdefghijklmno', position: 26 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'abcdefghijklmno', type: 'literal', position: 26 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'regex',
+        value: /(a)(b)(c)(d)(e)(f)(g)(h)(i)(j)(k)(l)(m)/g,
+        position: 69 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: /(a)(b)(c)(d)(e)(f)(g)(h)(i)(j)(k)(l)(m)/g,
+        type: 'regex',
+        position: 69 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '$8$5$12$12$18$123', position: 90 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '$8$5$12$12$18$123', type: 'literal', position: 90 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'replace', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'replace', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'abcdefghijklmno', position: 26 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'abcdefghijklmno', type: 'literal', position: 26 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'regex', value: /xyz/g, position: 33 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: /xyz/g, type: 'regex', position: 33 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '$8$5$12$12$18$123', position: 54 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '$8$5$12$12$18$123', type: 'literal', position: 54 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'replace', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'replace', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'abcdefghijklmno', position: 26 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'abcdefghijklmno', type: 'literal', position: 26 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'regex', value: /ijk/g, position: 33 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: /ijk/g, type: 'regex', position: 33 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '$8$5$12$12$18$123', position: 54 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '$8$5$12$12$18$123', type: 'literal', position: 54 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'replace', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'replace', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'abcdefghijklmno', position: 26 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'abcdefghijklmno', type: 'literal', position: 26 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'regex', value: /(ijk)/g, position: 35 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: /(ijk)/g, type: 'regex', position: 35 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '$8$5$12$12$18$123', position: 56 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '$8$5$12$12$18$123', type: 'literal', position: 56 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'replace', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'replace', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'abcdefghijklmno', position: 26 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'abcdefghijklmno', type: 'literal', position: 26 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'regex', value: /ijk/g, position: 33 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: /ijk/g, type: 'regex', position: 33 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '$x', position: 39 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '$x', type: 'literal', position: 39 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'replace', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'replace', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'abcdefghijklmno', position: 26 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'abcdefghijklmno', type: 'literal', position: 26 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'regex', value: /(ijk)/g, position: 35 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: /(ijk)/g, type: 'regex', position: 35 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '$x$', position: 42 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '$x$', type: 'literal', position: 42 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'replace', position: 30 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'replace', type: 'variable', position: 30 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: '', position: 32 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '', type: 'variable', position: 32 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Product Name', position: 47 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product Name', type: 'literal', position: 47 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'regex', value: /hat/gi, position: 55 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: /hat/gi, type: 'regex', position: 55 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'function', position: 65 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'function', type: 'name', position: 65 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'match', position: 72 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'match', type: 'variable', position: 72 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'foo', position: 81 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'literal', position: 81 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'replace', position: 30 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'replace', type: 'variable', position: 30 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: '', position: 32 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '', type: 'variable', position: 32 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Product Name', position: 47 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product Name', type: 'literal', position: 47 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'regex', value: /(h)(at)/gi, position: 59 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: /(h)(at)/gi, type: 'regex', position: 59 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'function', position: 69 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'function', type: 'name', position: 69 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'match', position: 76 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'match', type: 'variable', position: 76 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'uppercase', position: 90 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'uppercase', type: 'variable', position: 90 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'match', position: 97 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'match', type: 'variable', position: 97 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'match', position: 103 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'match', type: 'name', position: 103 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'replace', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'replace', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal',
+        value: 'temperature = 68F today',
+        position: 34 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'temperature = 68F today',
+        type: 'literal',
+        position: 34 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'regex', value: /(-?\d+(?:\.\d*)?)F\b/g, position: 58 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: /(-?\d+(?:\.\d*)?)F\b/g, type: 'regex', position: 58 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'function', position: 68 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'function', type: 'name', position: 68 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'm', position: 71 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'm', type: 'variable', position: 71 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'number', position: 83 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'number', type: 'variable', position: 83 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'm', position: 86 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'm', type: 'variable', position: 86 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'groups', position: 93 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'groups', type: 'name', position: 93 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 0, position: 95 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 0, type: 'literal', position: 95 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 32, position: 102 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 32, type: 'literal', position: 102 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 5, position: 107 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 5, type: 'literal', position: 107 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 9, position: 109 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 9, type: 'literal', position: 109 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'C', position: 115 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'C', type: 'literal', position: 115 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'replace', position: 30 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'replace', type: 'variable', position: 30 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: '', position: 32 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '', type: 'variable', position: 32 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Product Name', position: 47 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product Name', type: 'literal', position: 47 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'regex', value: /hat/gi, position: 55 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: /hat/gi, type: 'regex', position: 55 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'function', position: 65 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'function', type: 'name', position: 65 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'match', position: 72 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'match', type: 'variable', position: 72 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: true, position: 80 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: true, type: 'literal', position: 80 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:79
+      ret =  { value: '', type: 'variable', position: 1 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1.1, position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1.1, type: 'literal', position: 5 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 0.9, type: 'literal', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 27 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 27 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: '', type: 'variable', position: 30 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 27 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 27 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: '', position: 31 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '', type: 'variable', position: 31 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 27 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 27 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: '', position: 31 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '', type: 'variable', position: 31 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 28 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 28 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Description', position: 41 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Description', type: 'name', position: 41 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Colour', position: 48 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Colour', type: 'name', position: 48 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 28 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 28 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'SKU', position: 33 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'SKU', type: 'name', position: 33 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 28 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 28 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Quantity', position: 39 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Quantity', type: 'name', position: 39 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Description', position: 52 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Description', type: 'name', position: 52 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Colour', position: 59 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Colour', type: 'name', position: 59 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Quantity', position: 31 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Quantity', type: 'name', position: 31 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Description', position: 44 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Description', type: 'name', position: 44 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Colour', position: 51 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Colour', type: 'name', position: 51 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Description', position: 64 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Description', type: 'name', position: 64 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Colour', position: 71 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Colour', type: 'name', position: 71 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Quantity', position: 31 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Quantity', type: 'name', position: 31 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Description', position: 45 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Description', type: 'name', position: 45 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Colour', position: 52 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Colour', type: 'name', position: 52 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Description', position: 65 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Description', type: 'name', position: 65 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Colour', position: 72 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Colour', type: 'name', position: 72 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 28 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 28 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'SKU', position: 33 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'SKU', type: 'name', position: 33 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 28 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 28 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'SKU', position: 33 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'SKU', type: 'name', position: 33 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 28 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 28 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'SKU', position: 33 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'SKU', type: 'name', position: 33 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 28 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 28 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'SKU', position: 33 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'SKU', type: 'name', position: 33 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 28 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 28 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'SKU', position: 33 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'SKU', type: 'name', position: 33 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 28 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 28 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'SKU', position: 33 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'SKU', type: 'name', position: 33 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'foo', position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'literal', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'bar', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'bar', type: 'literal', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'foo', position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'literal', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'bar', position: 11 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'bar', type: 'literal', position: 11 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'blah', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'blah', type: 'name', position: 8 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'baz', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'baz', type: 'name', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'fud', position: 19 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'fud', type: 'name', position: 19 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 24 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 24 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'blah', position: 29 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'blah', type: 'name', position: 29 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'baz', position: 36 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'baz', type: 'name', position: 36 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'fud', position: 40 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'fud', type: 'name', position: 40 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'blah', position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'blah', type: 'name', position: 9 }
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+      alt =  { type: 'name', value: 'baz', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'baz', type: 'name', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'fud', position: 20 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'fud', type: 'name', position: 20 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'blah', position: 27 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'blah', type: 'name', position: 27 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'baz', position: 34 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'baz', type: 'name', position: 34 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'fud', position: 38 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'fud', type: 'name', position: 38 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'blah', position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'blah', type: 'name', position: 9 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'baz', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'baz', type: 'name', position: 16 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'fud', type: 'name', position: 20 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'none', type: 'name', position: 27 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'none', type: 'name', position: 9 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'here', type: 'name', position: 14 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'blah', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'baz', type: 'name', position: 28 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: '', position: 1 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '', type: 'variable', position: 1 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'bar', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'bar', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: '', position: 1 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '', type: 'variable', position: 1 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'bar', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'bar', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'bar', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'bar', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: '', position: 1 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '', type: 'variable', position: 1 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'bar', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'bar', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: '', position: 1 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '', type: 'variable', position: 1 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'bar', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'bar', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: '', position: 1 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '', type: 'variable', position: 1 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'lowercase', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'lowercase', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Salutation', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Salutation', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'lowercase', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'lowercase', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: '敷', position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '敷', type: 'name', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'lowercase', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'lowercase', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Español', position: 18 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Español', type: 'name', position: 18 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'lowercase', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'lowercase', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: '', position: 12 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '', type: 'variable', position: 12 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'NI.Number', position: 24 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'NI.Number', type: 'literal', position: 24 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'lowercase', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'lowercase', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'COMPENSATION IS : ', position: 31 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'COMPENSATION IS : ', type: 'literal', position: 31 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Employment', position: 44 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Employment', type: 'name', position: 44 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal',
+        value: 'Executive.Compensation',
+        position: 69 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Executive.Compensation',
+        type: 'literal',
+        position: 69 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Hello', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Hello', type: 'literal', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'uppercase', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'uppercase', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Salutation', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Salutation', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'uppercase', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'uppercase', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Hello World', position: 24 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Hello World', type: 'literal', position: 24 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'uppercase', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'uppercase', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '鯵噂ソ竹', position: 17 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '鯵噂ソ竹', type: 'literal', position: 17 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Employment', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Employment', type: 'name', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Name', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Name', type: 'name', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: ' is happy', position: 29 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: ' is happy', type: 'literal', position: 29 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Employment', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Employment', type: 'name', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Name', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Name', type: 'name', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal',
+        value: ' is pleased to employ ',
+        position: 42 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: ' is pleased to employ ',
+        type: 'literal',
+        position: 42 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Salutation', position: 55 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Salutation', type: 'name', position: 55 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: ' ', position: 61 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: ' ', type: 'literal', position: 61 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Surname', position: 71 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Surname', type: 'name', position: 71 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'uppercase', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'uppercase', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Hello ', position: 19 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Hello ', type: 'literal', position: 19 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Salutation', position: 32 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Salutation', type: 'name', position: 32 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: ' ', position: 38 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: ' ', type: 'literal', position: 38 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Surname', position: 48 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Surname', type: 'name', position: 48 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'uppercase', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'uppercase', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Salutation', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Salutation', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: ' ', position: 27 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: ' ', type: 'literal', position: 27 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Surname', position: 37 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Surname', type: 'name', position: 37 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: ' - has ', position: 49 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: ' - has ', type: 'literal', position: 49 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Cars', position: 56 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Cars', type: 'name', position: 56 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: ' registered cars', position: 77 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: ' registered cars', type: 'literal', position: 77 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'uppercase', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'uppercase', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Employment', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Employment', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'ContractType', position: 34 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'ContractType', type: 'name', position: 34 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substringBefore', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substringBefore', type: 'variable', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Hola', position: 23 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Hola', type: 'literal', position: 23 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'l', position: 28 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'l', type: 'literal', position: 28 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substringBefore', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substringBefore', type: 'variable', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Hola', position: 23 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Hola', type: 'literal', position: 23 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'l', position: 28 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'l', type: 'literal', position: 28 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substringBefore', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substringBefore', type: 'variable', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Hola', position: 23 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Hola', type: 'literal', position: 23 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Q', position: 28 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Q', type: 'literal', position: 28 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substringBefore', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substringBefore', type: 'variable', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Hola', position: 23 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Hola', type: 'literal', position: 23 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '', position: 27 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '', type: 'literal', position: 27 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substringBefore', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substringBefore', type: 'variable', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '鯵噂ソ竹', position: 23 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '鯵噂ソ竹', type: 'literal', position: 23 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'ソ', position: 28 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'ソ', type: 'literal', position: 28 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substringAfter', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substringAfter', type: 'variable', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Coca', position: 22 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Coca', type: 'literal', position: 22 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Cola', position: 31 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Cola', type: 'literal', position: 31 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'ca', position: 37 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'ca', type: 'literal', position: 37 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substringAfter', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substringAfter', type: 'variable', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Salutation', position: 26 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Salutation', type: 'name', position: 26 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: ' ', position: 32 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: ' ', type: 'literal', position: 32 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'MiddleName', position: 45 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'MiddleName', type: 'name', position: 45 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: ' ', position: 50 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: ' ', type: 'literal', position: 50 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Surname', position: 60 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Surname', type: 'name', position: 60 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'MiddleName', position: 72 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'MiddleName', type: 'name', position: 72 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substringAfter', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substringAfter', type: 'variable', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Salutation', position: 26 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Salutation', type: 'name', position: 26 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: ' ', position: 32 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: ' ', type: 'literal', position: 32 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Employment', position: 45 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Employment', type: 'name', position: 45 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Role', position: 50 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Role', type: 'name', position: 50 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Salutation', position: 62 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Salutation', type: 'name', position: 62 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substringAfter', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substringAfter', type: 'variable', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Hola', position: 22 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Hola', type: 'literal', position: 22 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'l', position: 27 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'l', type: 'literal', position: 27 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substringAfter', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substringAfter', type: 'variable', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Hola', position: 22 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Hola', type: 'literal', position: 22 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Q', position: 27 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Q', type: 'literal', position: 27 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'lowercase', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'lowercase', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Employment', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Employment', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Role', position: 26 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Role', type: 'name', position: 26 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: ' (', position: 34 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: ' (', type: 'literal', position: 34 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Employment', position: 47 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Employment', type: 'name', position: 47 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Role', position: 52 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Role', type: 'name', position: 52 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: ')', position: 58 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: ')', type: 'literal', position: 58 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Employment', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Employment', type: 'name', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Years', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Years', type: 'name', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: ' years of employment', position: 41 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: ' years of employment', type: 'literal', position: 41 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'uppercase', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'uppercase', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Salutation', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Salutation', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: ' ', position: 27 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: ' ', type: 'literal', position: 27 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Surname', position: 37 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Surname', type: 'name', position: 37 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: ' - has ', position: 49 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: ' - has ', type: 'literal', position: 49 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Employment', position: 62 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Employment', type: 'name', position: 62 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Years', position: 68 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Years', type: 'name', position: 68 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: ' years of employment', position: 93 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: ' years of employment', type: 'literal', position: 93 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substring', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substring', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Employment', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Employment', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Role', position: 26 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Role', type: 'name', position: 26 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 7, position: 29 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 7, type: 'literal', position: 29 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 4, position: 31 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 4, type: 'literal', position: 31 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substring', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substring', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Employment', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Employment', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Role', position: 26 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Role', type: 'name', position: 26 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 4, position: 30 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 4, type: 'literal', position: 30 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 4, position: 32 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 4, type: 'literal', position: 32 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substring', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substring', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Hello World', position: 24 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Hello World', type: 'literal', position: 24 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Cars', position: 29 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Cars', type: 'name', position: 29 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 5, position: 31 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 5, type: 'literal', position: 31 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'lowercase', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'lowercase', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal',
+        value: 'Missing close brackets',
+        position: 35 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Missing close brackets',
+        type: 'literal',
+        position: 35 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'unknown', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'unknown', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Salutation', position: 19 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Salutation', type: 'name', position: 19 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'decrypt', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'decrypt', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Salutation', position: 19 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Salutation', type: 'name', position: 19 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Employment', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Employment', type: 'name', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'authentication', position: 25 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'authentication', type: 'name', position: 25 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Salutation', position: 36 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Salutation', type: 'name', position: 36 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'uppercase', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'uppercase', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Invalid', position: 18 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Invalid', type: 'name', position: 18 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'uppercase', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'uppercase', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Employment', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Employment', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Invalid', position: 29 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Invalid', type: 'name', position: 29 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'lowercase', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'lowercase', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Coca', position: 17 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Coca', type: 'literal', position: 17 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Cola', position: 25 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Cola', type: 'literal', position: 25 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'lowercase', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'lowercase', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Salary', position: 17 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Salary', type: 'name', position: 17 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'lowercase', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'lowercase', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 20, position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 20, type: 'literal', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'lowercase', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'lowercase', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 20.55, position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 20.55, type: 'literal', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'lowercase', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'lowercase', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Employment', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Employment', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'lowercase', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'lowercase', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Qualifications', position: 25 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Qualifications', type: 'name', position: 25 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'uppercase', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'uppercase', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Coca', position: 17 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Coca', type: 'literal', position: 17 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Cola', position: 25 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Cola', type: 'literal', position: 25 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'uppercase', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'uppercase', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Salary', position: 17 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Salary', type: 'name', position: 17 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'uppercase', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'uppercase', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 28, position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 28, type: 'literal', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'uppercase', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'uppercase', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 20.55, position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 20.55, type: 'literal', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'uppercase', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'uppercase', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Cars', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Cars', type: 'name', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'uppercase', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'uppercase', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Employment', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Employment', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'uppercase', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'uppercase', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Qualifications', position: 25 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Qualifications', type: 'name', position: 25 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substringBefore', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substringBefore', type: 'variable', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Coca', position: 23 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Coca', type: 'literal', position: 23 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'ca', position: 30 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'ca', type: 'literal', position: 30 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substringBefore', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substringBefore', type: 'variable', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Salary', position: 23 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Salary', type: 'name', position: 23 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'xx', position: 28 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'xx', type: 'literal', position: 28 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substringBefore', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substringBefore', type: 'variable', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 22, position: 19 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 22, type: 'literal', position: 19 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'xx', position: 24 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'xx', type: 'literal', position: 24 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substringBefore', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substringBefore', type: 'variable', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 22.55, position: 22 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 22.55, type: 'literal', position: 22 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'xx', position: 27 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'xx', type: 'literal', position: 27 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substringBefore', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substringBefore', type: 'variable', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '22', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '22', type: 'literal', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 2, position: 23 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 23 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substringBefore', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substringBefore', type: 'variable', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '22.55', position: 24 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '22.55', type: 'literal', position: 24 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 5, position: 26 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 5, type: 'literal', position: 26 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substringBefore', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substringBefore', type: 'variable', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Employment', position: 27 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Employment', type: 'name', position: 27 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'xx', position: 32 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'xx', type: 'literal', position: 32 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substringBefore', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substringBefore', type: 'variable', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Qualifications', position: 31 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Qualifications', type: 'name', position: 31 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'xx', position: 36 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'xx', type: 'literal', position: 36 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substringAfter', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substringAfter', type: 'variable', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Coca', position: 22 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Coca', type: 'literal', position: 22 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'ca', position: 29 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'ca', type: 'literal', position: 29 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substringAfter', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substringAfter', type: 'variable', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Salary', position: 22 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Salary', type: 'name', position: 22 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'xx', position: 27 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'xx', type: 'literal', position: 27 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substringAfter', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substringAfter', type: 'variable', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 22, position: 18 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 22, type: 'literal', position: 18 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'xx', position: 23 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'xx', type: 'literal', position: 23 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substringAfter', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substringAfter', type: 'variable', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 22.55, position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 22.55, type: 'literal', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'xx', position: 26 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'xx', type: 'literal', position: 26 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substringAfter', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substringAfter', type: 'variable', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '22', position: 20 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '22', type: 'literal', position: 20 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 2, position: 22 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 22 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substringAfter', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substringAfter', type: 'variable', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: '22.55', position: 23 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '22.55', type: 'literal', position: 23 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 5, position: 25 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 5, type: 'literal', position: 25 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substringAfter', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substringAfter', type: 'variable', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Employment', position: 26 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Employment', type: 'name', position: 26 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'xx', position: 31 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'xx', type: 'literal', position: 31 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substringAfter', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substringAfter', type: 'variable', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Qualifications', position: 30 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Qualifications', type: 'name', position: 30 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'xx', position: 35 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'xx', type: 'literal', position: 35 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substring', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substring', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Coca', position: 17 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Coca', type: 'literal', position: 17 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'ca', position: 24 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'ca', type: 'literal', position: 24 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 2, position: 27 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 27 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 4, position: 30 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 4, type: 'literal', position: 30 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 5, position: 33 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 5, type: 'literal', position: 33 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substring', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substring', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Coca', position: 17 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Coca', type: 'literal', position: 17 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Mr', position: 23 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Mr', type: 'literal', position: 23 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 4, position: 26 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 4, type: 'literal', position: 26 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substring', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substring', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Coca', position: 17 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Coca', type: 'literal', position: 17 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 3, position: 20 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 3, type: 'literal', position: 20 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Whoops', position: 30 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Whoops', type: 'literal', position: 30 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substring', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substring', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Salary', position: 17 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Salary', type: 'name', position: 17 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 2, position: 19 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 19 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 4, position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 4, type: 'literal', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substring', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substring', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Hello', position: 18 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Hello', type: 'literal', position: 18 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'World', position: 26 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'World', type: 'literal', position: 26 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 5, position: 28 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 5, type: 'literal', position: 28 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substring', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substring', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Hello', position: 18 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Hello', type: 'literal', position: 18 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 5, position: 20 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 5, type: 'literal', position: 20 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'World', position: 28 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'World', type: 'literal', position: 28 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substring', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substring', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Hello World', position: 24 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Hello World', type: 'literal', position: 24 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 5.5, position: 28 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 5.5, type: 'literal', position: 28 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 5, position: 30 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 5, type: 'literal', position: 30 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substring', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substring', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Employment', position: 21 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Employment', type: 'name', position: 21 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'xx', position: 26 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'xx', type: 'literal', position: 26 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'substring', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'substring', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Qualifications', position: 25 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Qualifications', type: 'name', position: 25 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 6, position: 27 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 6, type: 'literal', position: 27 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 5, position: 29 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 5, type: 'literal', position: 29 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'detail', position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'detail', type: 'name', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'contents', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'contents', type: 'name', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'detail', position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'detail', type: 'name', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'meta', position: 11 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'meta', type: 'name', position: 11 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'detail', position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'detail', type: 'name', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'meta', position: 11 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'meta', type: 'name', position: 11 }
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+      ret =  { value: '', type: 'variable', position: 1 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 13 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 19 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 27 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Total', type: 'literal', position: 36 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 42 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 42 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Quantity', type: 'name', position: 51 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Description', type: 'literal', position: 67 }
+    console.log src/parser/parser.ts:78
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+    console.log src/parser/parser.ts:79
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Quantity', type: 'name', position: 49 }
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+    console.log src/parser/parser.ts:79
+      ret =  { value: 'clone', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 5, position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 5, type: 'literal', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: '', position: 16 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '', type: 'variable', position: 16 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 28 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 28 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Order', position: 34 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Order', type: 'name', position: 34 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 42 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 42 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'blah', position: 50 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'blah', type: 'literal', position: 50 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'foo', position: 56 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'literal', position: 56 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'function', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'function', type: 'name', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'f', position: 11 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'f', type: 'variable', position: 11 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'g', position: 15 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'g', type: 'variable', position: 15 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'function', position: 27 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'function', type: 'name', position: 27 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'x', position: 30 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'x', type: 'variable', position: 30 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'g', position: 35 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'g', type: 'variable', position: 35 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'f', position: 38 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'f', type: 'variable', position: 38 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'x', position: 41 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'x', type: 'variable', position: 41 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'price', position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'price', type: 'variable', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'bar', position: 14 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'bar', type: 'name', position: 14 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'price', position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'price', type: 'variable', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'bar', position: 14 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'bar', type: 'name', position: 14 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'var', position: 4 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'var', type: 'variable', position: 4 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: '', position: 1 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '', type: 'variable', position: 1 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 5 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 5 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'bar', position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'bar', type: 'name', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'a', position: 2 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'a', type: 'variable', position: 2 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 5, position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 5, type: 'literal', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'a', position: 2 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'a', type: 'variable', position: 2 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'b', position: 8 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'b', type: 'variable', position: 8 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 5, position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 5, type: 'literal', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'a', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'a', type: 'variable', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'b', position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'b', type: 'variable', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 5, position: 14 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 5, type: 'literal', position: 14 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'a', position: 18 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'a', type: 'variable', position: 18 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'a', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'a', type: 'variable', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'b', position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'b', type: 'variable', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 5, position: 14 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 5, type: 'literal', position: 14 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'b', position: 18 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'b', type: 'variable', position: 18 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'a', position: 4 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'a', type: 'variable', position: 4 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 5, position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 5, type: 'literal', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'a', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'a', type: 'variable', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'a', position: 19 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'a', type: 'variable', position: 19 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 2, position: 23 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 23 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'a', position: 27 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'a', type: 'variable', position: 27 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 1, position: 2 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 1, type: 'literal', position: 2 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 2, position: 4 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 2, type: 'literal', position: 4 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 3, position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 3, type: 'literal', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'v', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'v', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'foo', position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'variable', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'defined', position: 19 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'defined', type: 'literal', position: 19 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'foo', position: 27 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'variable', position: 27 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'nothing', position: 38 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'nothing', type: 'name', position: 38 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'foo', position: 46 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'variable', position: 46 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'foo', position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'variable', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'defined', position: 19 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'defined', type: 'literal', position: 19 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'foo', position: 27 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'variable', position: 27 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'nothing', position: 38 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'nothing', type: 'name', position: 38 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: 'foo', position: 44 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'variable', position: 44 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'baz', position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'baz', type: 'name', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'bazz', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'bazz', type: 'name', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'baz', position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'baz', type: 'name', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'baz', position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'baz', type: 'name', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'baz', position: 9 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'baz', type: 'name', position: 9 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'foo', position: 3 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'foo', type: 'name', position: 3 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 0, position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 0, type: 'literal', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'type', position: 6 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'type', type: 'name', position: 6 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'home', position: 13 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'home', type: 'literal', position: 13 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: '$', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '$', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 18 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 18 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Account Name', position: 33 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account Name', type: 'literal', position: 33 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Firefly', position: 45 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Firefly', type: 'literal', position: 45 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'OrderID', position: 56 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'OrderID', type: 'name', position: 56 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'order104', position: 67 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'order104', type: 'literal', position: 67 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 76 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 76 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 82 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 82 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 7 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 7 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'variable', value: '$', position: 10 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: '$', type: 'variable', position: 10 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account', position: 18 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account', type: 'name', position: 18 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Account Name', position: 33 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Account Name', type: 'name', position: 33 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'Firefly', position: 45 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Firefly', type: 'literal', position: 45 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'OrderID', position: 56 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'OrderID', type: 'name', position: 56 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'literal', value: 'order104', position: 67 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'order104', type: 'literal', position: 67 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Product', position: 76 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Product', type: 'name', position: 76 }
+    console.log src/parser/parser.ts:78
+      alt =  { type: 'name', value: 'Price', position: 82 }
+    console.log src/parser/parser.ts:79
+      ret =  { value: 'Price', type: 'name', position: 82 }
+
+
+Test Suites: 4 passed, 4 total
+Tests:       1094 passed, 1094 total
+Snapshots:   0 total
+Time:        12.678s
+Ran all test suites.
+----------------|----------|----------|----------|----------|----------------|
+File            |  % Stmts | % Branch |  % Funcs |  % Lines |Uncovered Lines |
+----------------|----------|----------|----------|----------|----------------|
+All files       |      100 |      100 |      100 |      100 |                |
+ src            |      100 |      100 |      100 |      100 |                |
+  constants.ts  |      100 |      100 |      100 |      100 |                |
+  evaluate.ts   |      100 |      100 |      100 |      100 |                |
+  functions.ts  |      100 |      100 |      100 |      100 |                |
+  index.ts      |      100 |      100 |      100 |      100 |                |
+  jsonata.ts    |      100 |      100 |      100 |      100 |                |
+  signatures.ts |      100 |      100 |      100 |      100 |                |
+  tokenizer.ts  |      100 |      100 |      100 |      100 |                |
+  utils.ts      |      100 |      100 |      100 |      100 |                |
+ src/parser     |      100 |      100 |      100 |      100 |                |
+  index.ts      |      100 |      100 |      100 |      100 |                |
+  optimize.ts   |      100 |      100 |      100 |      100 |                |
+  parser.ts     |      100 |      100 |      100 |      100 |                |
+  tail_call.ts  |      100 |      100 |      100 |      100 |                |
+----------------|----------|----------|----------|----------|----------------|
+Done in 14.90s.
diff --git a/test/.eslintrc b/test/.eslintrc
deleted file mode 100644
index b921a70d..00000000
--- a/test/.eslintrc
+++ /dev/null
@@ -1,6 +0,0 @@
-{
-  // Rules ammendments
-  "rules": {
-    "strict": ["error", "global"],
-  }
-}
diff --git a/test/parser-recovery.js b/test/parser-recovery.js
deleted file mode 100644
index 53a7be0e..00000000
--- a/test/parser-recovery.js
+++ /dev/null
@@ -1,448 +0,0 @@
-"use strict";
-
-var jsonata = require('../jsonata');
-var assert = require('assert');
-var chai = require("chai");
-var expect = chai.expect;
-
-describe('Invoke parser with valid expression', function() {
-    describe('Account.Order[0]', function() {
-        it('should return ast', function() {
-            var expr = jsonata('Account.Order[0]', { recover: true });
-            var ast = expr.ast();
-            var expected_ast = {
-                "type": "path",
-                "steps": [
-                    {
-                        "value": "Account",
-                        "type": "name",
-                        "position": 7
-                    },
-                    {
-                        "value": "Order",
-                        "type": "name",
-                        "position": 13,
-                        "predicate": [
-                            {
-                                "value": 0,
-                                "type": "literal",
-                                "position": 15
-                            }
-                        ]
-                    }
-                ]
-            };
-            var errors = expr.errors();
-            var expected_errors = undefined;
-            assert.deepEqual(ast, expected_ast);
-            assert.deepEqual(errors, expected_errors);
-        });
-    });
-});
-
-describe('Invoke parser with incomplete expression', function() {
-    describe('Account.', function() {
-        it('should return ast', function() {
-            var expr = jsonata('Account.', { recover: true });
-            var ast = expr.ast();
-            var expected_ast = {
-                "type": "path",
-                "steps": [
-                    {
-                        "value": "Account",
-                        "type": "name",
-                        "position": 7
-                    },
-                    {
-                        "type": "error",
-                        "error": {
-                            "code": "S0207",
-                            "position": 8,
-                            "token": "(end)"
-                        }
-                    }
-                ]
-            };
-            var errors = expr.errors();
-            var expected_errors = [
-                {
-                    "code": "S0207",
-                    "position": 8,
-                    "token": "(end)"
-                }
-            ];
-            assert.deepEqual(ast, expected_ast);
-            assert.deepEqual(errors, expected_errors);
-        });
-    });
-
-    describe('Account[', function() {
-        it('should return ast', function() {
-            var expr = jsonata('Account[', { recover: true });
-            var ast = expr.ast();
-            var expected_ast = {
-                "type": "path",
-                "steps": [
-                    {
-                        "value": "Account",
-                        "type": "name",
-                        "position": 7,
-                        "predicate": [
-                            {
-                                "type": "error",
-                                "error": {
-                                    "code": "S0207",
-                                    "position": 8,
-                                    "token": "(end)"
-                                }
-                            }
-                        ]
-                    }
-                ]
-            };
-            var errors = expr.errors();
-            var expected_errors =   [
-                {
-                    "code": "S0203",
-                    "position": 8,
-                    "token": "(end)",
-                    "value": "]",
-                    "remaining": []
-                },
-                {
-                    "code": "S0207",
-                    "position": 8,
-                    "token": "(end)"
-                }
-            ];
-            assert.deepEqual(ast, expected_ast);
-            assert.deepEqual(errors, expected_errors);
-        });
-    });
-
-    describe('Account.Order[;0].Product', function() {
-        it('should return ast', function() {
-            var expr = jsonata('Account.Order[;0].Product', { recover: true });
-            var ast = expr.ast();
-            var expected_ast = {
-                "type": "path",
-                "steps": [
-                    {
-                        "value": "Account",
-                        "type": "name",
-                        "position": 7
-                    },
-                    {
-                        "value": "Order",
-                        "type": "name",
-                        "position": 13,
-                        "predicate": [
-                            {
-                                "code": "S0211",
-                                "token": ";",
-                                "position": 15,
-                                "remaining": [
-                                    {"value": 0, "type": "literal", "position": 16},
-                                    {"type": "operator", "value": "]", "position": 17},
-                                    {"type": "operator", "value": ".", "position": 18},
-                                    {"type": "name", "value": "Product", "position": 25}
-                                ],
-                                "type": "error"
-                            }
-                        ]
-                    }
-                ]
-            };
-            var errors = expr.errors();
-            var expected_errors =   [
-                {
-                    "code": "S0211",
-                    "token": ";",
-                    "position": 15,
-                    "remaining": [
-                        {"value": 0, "type": "literal", "position": 16},
-                        {"type": "operator", "value": "]", "position": 17},
-                        {"type": "operator", "value": ".", "position": 18},
-                        {"type": "name", "value": "Product", "position": 25}
-                    ],
-                    "type": "error"
-                },
-                {
-                    "code": "S0202",
-                    "position": 16,
-                    "token": "0",
-                    "value": "]",
-                    "remaining": [
-                        {
-                            "value": 0,
-                            "type": "literal",
-                            "position": 16
-                        }
-                    ]
-                }
-            ];
-            assert.deepEqual(ast, expected_ast);
-            assert.deepEqual(errors, expected_errors);
-        });
-    });
-
-    describe('Account.Order[0;].Product', function() {
-        it('should return ast', function() {
-            var expr = jsonata('Account.Order[0;].Product', { recover: true });
-            var ast = expr.ast();
-            var expected_ast = {
-                "type": "path",
-                "steps": [
-                    {
-                        "value": "Account",
-                        "type": "name",
-                        "position": 7
-                    },
-                    {
-                        "value": "Order",
-                        "type": "name",
-                        "position": 13,
-                        "predicate": [
-                            {
-                                "value": 0,
-                                "type": "literal",
-                                "position": 15
-                            }
-                        ]
-                    }
-                ]
-            };
-            var errors = expr.errors();
-            var expected_errors =   [
-                {
-                    "code": "S0202",
-                    "position": 16,
-                    "token": ";",
-                    "value": "]",
-                    "remaining": [
-                        {"value": ";", "type": "operator", "position": 16},
-                        {"type": "operator", "value": "]", "position": 17},
-                        {"type": "operator", "value": ".", "position": 18},
-                        {"type": "name", "value": "Product", "position": 25}
-                    ]
-                }
-            ];
-            assert.deepEqual(ast, expected_ast);
-            assert.deepEqual(errors, expected_errors);
-        });
-    });
-
-    describe('Account.Order[0].Product;', function() {
-        it('should return ast', function() {
-            var expr = jsonata('Account.Order[0].Product;', { recover: true });
-            var ast = expr.ast();
-            var expected_ast = {
-                "type": "path",
-                "steps": [
-                    {
-                        "value": "Account",
-                        "type": "name",
-                        "position": 7
-                    },
-                    {
-                        "value": "Order",
-                        "type": "name",
-                        "position": 13,
-                        "predicate": [
-                            {
-                                "value": 0,
-                                "type": "literal",
-                                "position": 15
-                            }
-                        ]
-                    },
-                    {
-                        "value": "Product",
-                        "type": "name",
-                        "position": 24
-                    }
-                ]
-            };
-            var errors = expr.errors();
-            var expected_errors = [
-                {
-                    "code": "S0201",
-                    "position": 25,
-                    "remaining": [
-                        {
-                            "position": 25,
-                            "type": "operator",
-                            "value": ";"
-                        }
-                    ],
-                    "token": ";"
-                }
-            ];
-            assert.deepEqual(ast, expected_ast);
-            assert.deepEqual(errors, expected_errors);
-        });
-    });
-
-    describe('$equals3lucy[0].UnstructuredAnswers^()[0].Text', function() {
-        it('should return ast', function() {
-            var expr = jsonata('$equals3lucy[0].UnstructuredAnswers^()[0].Text', { recover: true });
-            var ast = expr.ast();
-            var expected_ast = {
-                "type": "sort",
-                "value": "^",
-                "position": 36,
-                "lhs": {
-                    "type": "path",
-                    "steps": [
-                        {
-                            "value": "equals3lucy",
-                            "type": "variable",
-                            "position": 12,
-                            "predicate": [
-                                {
-                                    "value": 0,
-                                    "type": "literal",
-                                    "position": 14
-                                }
-                            ]
-                        },
-                        {
-                            "value": "UnstructuredAnswers",
-                            "type": "name",
-                            "position": 35
-                        }
-                    ]
-                },
-                "rhs": [
-                    {
-                        "descending": false,
-                        "expression": {
-                            "code": "S0211",
-                            "token": ")",
-                            "position": 38,
-                            "remaining": [
-                                {
-                                    "type": "operator",
-                                    "value": "[",
-                                    "position": 39
-                                },
-                                {
-                                    "type": "number",
-                                    "value": 0,
-                                    "position": 40
-                                },
-                                {
-                                    "type": "operator",
-                                    "value": "]",
-                                    "position": 41
-                                },
-                                {
-                                    "type": "operator",
-                                    "value": ".",
-                                    "position": 42
-                                },
-                                {
-                                    "type": "name",
-                                    "value": "Text",
-                                    "position": 46
-                                }
-                            ],
-                            "type": "error",
-                            "predicate": [
-                                {
-                                    "type": "error",
-                                    "error": {
-                                        "code": "S0207",
-                                        "position": 46,
-                                        "token": "(end)"
-                                    }
-                                }
-                            ]
-                        }
-                    }
-                ]
-            };
-            var errors = expr.errors();
-            var expected_errors = [
-                {
-                    "code": "S0211",
-                    "position": 38,
-                    "predicate": [
-                        {
-                            "error": {
-                                "code": "S0207",
-                                "position": 46,
-                                "token": "(end)"
-                            },
-                            "type": "error"
-                        }
-                    ],
-                    "remaining": [
-                        {
-                            "position": 39,
-                            "type": "operator",
-                            "value": "["
-                        },
-                        {
-                            "position": 40,
-                            "type": "number",
-                            "value": 0
-                        },
-                        {
-                            "position": 41,
-                            "type": "operator",
-                            "value": "]"
-                        },
-                        {
-                            "position": 42,
-                            "type": "operator",
-                            "value": "."
-                        },
-                        {
-                            "position": 46,
-                            "type": "name",
-                            "value": "Text"
-                        }
-                    ],
-                    "token": ")",
-                    "type": "error"
-                },
-                {
-                    "code": "S0203",
-                    "position": 46,
-                    "remaining": [],
-                    "token": "(end)",
-                    "value": "]"
-                },
-                {
-                    "code": "S0203",
-                    "position": 46,
-                    "remaining": [],
-                    "token": "(end)",
-                    "value": ")"
-                },
-                {
-                    "code": "S0207",
-                    "position": 46,
-                    "token": "(end)"
-                }
-            ];
-            assert.deepEqual(ast, expected_ast);
-            assert.deepEqual(errors, expected_errors);
-        });
-    });
-
-    describe('An expression with syntax error should not be executable', function() {
-        describe('Account.', function() {
-            it('should return ast', function() {
-                var expr = jsonata('Account.', { recover: true });
-                expect(function () {
-                    expr.evaluate({});
-                }).to.throw()
-                    .to.deep.contain({position: 0, code: 'S0500'});
-            });
-        });
-    });
-
-});
-
diff --git a/tsconfig-es2015.json b/tsconfig-es2015.json
new file mode 100644
index 00000000..09e75224
--- /dev/null
+++ b/tsconfig-es2015.json
@@ -0,0 +1,5 @@
+{
+    "extends": "./tsconfig",
+    "compilerOptions": {
+    }
+}
\ No newline at end of file
diff --git a/tsconfig-es5.json b/tsconfig-es5.json
new file mode 100644
index 00000000..52872acb
--- /dev/null
+++ b/tsconfig-es5.json
@@ -0,0 +1,9 @@
+{
+    "extends": "./tsconfig",
+    "compilerOptions": {
+        "target": "es5",
+        "module": "commonjs",
+        "outDir": "./es5",
+        "downlevelIteration": true
+    }
+}
\ No newline at end of file
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 00000000..77f29ffb
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,66 @@
+{
+  "compilerOptions": {
+    /* Basic Options */
+    "target": "es2015",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', or 'ESNEXT'. */
+    "module": "es2015",                       /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
+    "lib": [
+      "es2015",
+      "dom"
+    ],                                        /* Specify library files to be included in the compilation:  */
+    // "allowJs": true,                       /* Allow javascript files to be compiled. */
+    // "checkJs": true,                       /* Report errors in .js files. */
+    // "jsx": "preserve",                     /* Specify JSX code generation: 'preserve', 'react-native', or 'react'. */
+    "declaration": true,                      /* Generates corresponding '.d.ts' file. */
+    "sourceMap": true,                        /* Generates corresponding '.map' file. */
+    // "outFile": "./",                       /* Concatenate and emit output to single file. */
+    "outDir": "./es2015",                        /* Redirect output structure to the directory. */
+    "rootDir": "./src",                       /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
+    "removeComments": false,                /* Do not emit comments to output. */
+    // "noEmit": true,                        /* Do not emit outputs. */
+    // "importHelpers": true,                 /* Import emit helpers from 'tslib'. */
+    // "downlevelIteration": true,               /* Provide full support for iterables in 'for-of', spread, and destructuring when targeting 'ES5' or 'ES3'. */
+    // "isolatedModules": true,               /* Transpile each file as a separate module (similar to 'ts.transpileModule'). */
+
+    /* Strict Type-Checking Options */
+    "strict": true,                           /* Enable all strict type-checking options. */
+    "noImplicitAny": false,                   /* Raise error on expressions and declarations with an implied 'any' type. */
+    "strictNullChecks": false,              /* Enable strict null checks. */
+    // "strictFunctionTypes": true,           /* Enable strict checking of function types. */
+    // "noImplicitThis": true,                /* Raise error on 'this' expressions with an implied 'any' type. */
+    // "alwaysStrict": true,                  /* Parse in strict mode and emit "use strict" for each source file. */
+
+    /* Additional Checks */
+    "noUnusedLocals": true,                /* Report errors on unused locals. */
+    // "noUnusedParameters": true,            /* Report errors on unused parameters. */
+    "noImplicitReturns": true,             /* Report error when not all code paths in function return a value. */
+    "noFallthroughCasesInSwitch": true,    /* Report errors for fallthrough cases in switch statement. */
+
+    /* Module Resolution Options */
+    "moduleResolution": "node",            /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
+    // "baseUrl": "./",                       /* Base directory to resolve non-absolute module names. */
+    // "paths": {},                           /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
+    // "rootDirs": [],                        /* List of root folders whose combined content represents the structure of the project at runtime. */
+    // "typeRoots": [],                       /* List of folders to include type definitions from. */
+    // "types": [],                           /* Type declaration files to be included in compilation. */
+    "allowSyntheticDefaultImports": false,  /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */
+    // "preserveSymlinks": true,              /* Do not resolve the real path of symlinks. */
+
+    /* Source Map Options */
+    // "sourceRoot": "./",                    /* Specify the location where debugger should locate TypeScript files instead of source locations. */
+    // "mapRoot": "./",                       /* Specify the location where debugger should locate map files instead of generated locations. */
+    // "inlineSourceMap": true,               /* Emit a single file with source maps instead of having a separate file. */
+    // "inlineSources": true,                 /* Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set. */
+
+    /* Experimental Options */
+    // "experimentalDecorators": true,        /* Enables experimental support for ES7 decorators. */
+    // "emitDecoratorMetadata": true,         /* Enables experimental support for emitting type metadata for decorators. */
+  },
+  "exclude": [
+    "node_modules",
+    "lib",
+    "es2015",
+    "es5",
+    "dist",
+    "__tests__",
+  ]
+}
\ No newline at end of file
diff --git a/yarn.lock b/yarn.lock
new file mode 100644
index 00000000..4dea01ef
--- /dev/null
+++ b/yarn.lock
@@ -0,0 +1,4058 @@
+# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+
+"@browserify/acorn5-object-spread@^5.0.1":
+  version "5.0.1"
+  resolved "https://registry.npmjs.org/@browserify/acorn5-object-spread/-/acorn5-object-spread-5.0.1.tgz#92e9b37f97beac9ec429a3cc479ded380297540c"
+  dependencies:
+    acorn "^5.2.1"
+
+"@types/jest@^22.0.1":
+  version "22.0.1"
+  resolved "https://registry.npmjs.org/@types/jest/-/jest-22.0.1.tgz#6370a6d60cce3845e4cd5d00bf65f654264685bc"
+
+"@types/node@^9.3.0":
+  version "9.3.0"
+  resolved "https://registry.npmjs.org/@types/node/-/node-9.3.0.tgz#3a129cda7c4e5df2409702626892cb4b96546dd5"
+
+JSONStream@^1.0.3:
+  version "1.3.2"
+  resolved "https://registry.npmjs.org/JSONStream/-/JSONStream-1.3.2.tgz#c102371b6ec3a7cf3b847ca00c20bb0fce4c6dea"
+  dependencies:
+    jsonparse "^1.2.0"
+    through ">=2.2.7 <3"
+
+abab@^1.0.3:
+  version "1.0.4"
+  resolved "https://registry.npmjs.org/abab/-/abab-1.0.4.tgz#5faad9c2c07f60dd76770f71cf025b62a63cfd4e"
+
+abbrev@1:
+  version "1.1.1"
+  resolved "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz#f8f2c887ad10bf67f634f005b6987fed3179aac8"
+
+abbrev@1.0.x:
+  version "1.0.9"
+  resolved "https://registry.npmjs.org/abbrev/-/abbrev-1.0.9.tgz#91b4792588a7738c25f35dd6f63752a2f8776135"
+
+acorn-globals@^3.1.0:
+  version "3.1.0"
+  resolved "https://registry.npmjs.org/acorn-globals/-/acorn-globals-3.1.0.tgz#fd8270f71fbb4996b004fa880ee5d46573a731bf"
+  dependencies:
+    acorn "^4.0.4"
+
+acorn-jsx@^3.0.0:
+  version "3.0.1"
+  resolved "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-3.0.1.tgz#afdf9488fb1ecefc8348f6fb22f464e32a58b36b"
+  dependencies:
+    acorn "^3.0.4"
+
+acorn@^3.0.4:
+  version "3.3.0"
+  resolved "https://registry.npmjs.org/acorn/-/acorn-3.3.0.tgz#45e37fb39e8da3f25baee3ff5369e2bb5f22017a"
+
+acorn@^4.0.3, acorn@^4.0.4:
+  version "4.0.13"
+  resolved "https://registry.npmjs.org/acorn/-/acorn-4.0.13.tgz#105495ae5361d697bd195c825192e1ad7f253787"
+
+acorn@^5.2.1:
+  version "5.3.0"
+  resolved "https://registry.npmjs.org/acorn/-/acorn-5.3.0.tgz#7446d39459c54fb49a80e6ee6478149b940ec822"
+
+ajv-keywords@^2.1.0:
+  version "2.1.1"
+  resolved "https://registry.npmjs.org/ajv-keywords/-/ajv-keywords-2.1.1.tgz#617997fc5f60576894c435f940d819e135b80762"
+
+ajv@^4.9.1:
+  version "4.11.8"
+  resolved "https://registry.npmjs.org/ajv/-/ajv-4.11.8.tgz#82ffb02b29e662ae53bdc20af15947706739c536"
+  dependencies:
+    co "^4.6.0"
+    json-stable-stringify "^1.0.1"
+
+ajv@^5.1.0, ajv@^5.2.3, ajv@^5.3.0:
+  version "5.5.2"
+  resolved "https://registry.npmjs.org/ajv/-/ajv-5.5.2.tgz#73b5eeca3fab653e3d3f9422b341ad42205dc965"
+  dependencies:
+    co "^4.6.0"
+    fast-deep-equal "^1.0.0"
+    fast-json-stable-stringify "^2.0.0"
+    json-schema-traverse "^0.3.0"
+
+align-text@^0.1.1, align-text@^0.1.3:
+  version "0.1.4"
+  resolved "https://registry.npmjs.org/align-text/-/align-text-0.1.4.tgz#0cd90a561093f35d0a99256c22b7069433fad117"
+  dependencies:
+    kind-of "^3.0.2"
+    longest "^1.0.1"
+    repeat-string "^1.5.2"
+
+amdefine@>=0.0.4:
+  version "1.0.1"
+  resolved "https://registry.npmjs.org/amdefine/-/amdefine-1.0.1.tgz#4a5282ac164729e93619bcfd3ad151f817ce91f5"
+
+ansi-escapes@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-3.0.0.tgz#ec3e8b4e9f8064fc02c3ac9b65f1c275bda8ef92"
+
+ansi-regex@^2.0.0:
+  version "2.1.1"
+  resolved "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz#c3b33ab5ee360d86e0e628f0468ae7ef27d654df"
+
+ansi-regex@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.npmjs.org/ansi-regex/-/ansi-regex-3.0.0.tgz#ed0317c322064f79466c02966bddb605ab37d998"
+
+ansi-styles@^2.2.1:
+  version "2.2.1"
+  resolved "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz#b432dd3358b634cf75e1e4664368240533c1ddbe"
+
+ansi-styles@^3.1.0, ansi-styles@^3.2.0:
+  version "3.2.0"
+  resolved "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.0.tgz#c159b8d5be0f9e5a6f346dab94f16ce022161b88"
+  dependencies:
+    color-convert "^1.9.0"
+
+anymatch@^1.3.0:
+  version "1.3.2"
+  resolved "https://registry.npmjs.org/anymatch/-/anymatch-1.3.2.tgz#553dcb8f91e3c889845dfdba34c77721b90b9d7a"
+  dependencies:
+    micromatch "^2.1.5"
+    normalize-path "^2.0.0"
+
+append-transform@^0.4.0:
+  version "0.4.0"
+  resolved "https://registry.npmjs.org/append-transform/-/append-transform-0.4.0.tgz#d76ebf8ca94d276e247a36bad44a4b74ab611991"
+  dependencies:
+    default-require-extensions "^1.0.0"
+
+aproba@^1.0.3:
+  version "1.2.0"
+  resolved "https://registry.npmjs.org/aproba/-/aproba-1.2.0.tgz#6802e6264efd18c790a1b0d517f0f2627bf2c94a"
+
+are-we-there-yet@~1.1.2:
+  version "1.1.4"
+  resolved "https://registry.npmjs.org/are-we-there-yet/-/are-we-there-yet-1.1.4.tgz#bb5dca382bb94f05e15194373d16fd3ba1ca110d"
+  dependencies:
+    delegates "^1.0.0"
+    readable-stream "^2.0.6"
+
+argparse@^1.0.7:
+  version "1.0.9"
+  resolved "https://registry.npmjs.org/argparse/-/argparse-1.0.9.tgz#73d83bc263f86e97f8cc4f6bae1b0e90a7d22c86"
+  dependencies:
+    sprintf-js "~1.0.2"
+
+arr-diff@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.npmjs.org/arr-diff/-/arr-diff-2.0.0.tgz#8f3b827f955a8bd669697e4a4256ac3ceae356cf"
+  dependencies:
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