add input validation

Author: zaggino

Diff for: .brackets.json

@@ -1,4 +1,7 @@
 {
+    "smartIndent": true,
+    "spaceUnits": 4,
+    "useTabChar": false,
     "language": {
         "javascript": {
             "linting.prefer": ["JSHint", "JSCS"],

Diff for: src/ZSchema.js

@@ -116,6 +116,18 @@ ZSchema.prototype.validateSchema = function (schema) {
     return report.isValid();
 };
 ZSchema.prototype.validate = function (json, schema, callback) {
+    var whatIs = Utils.whatIs(schema);
+    if (whatIs !== "string" && whatIs !== "object") {
+        var e = new Error("Invalid .validate call - schema must be an string or object but " + whatIs + " was passed!");
+        if (callback) {
+            process.nextTick(function () {
+                callback(e, false);
+            });
+            return;
+        }
+        throw e;
+    }
+
     var report = new Report(this.options);
 
     schema = SchemaCache.getSchema.call(this, report, schema);

Diff for: test/ZSchemaTestSuite/Issue101.js

@@ -0,0 +1,20 @@
+"use strict";
+
+module.exports = {
+    description: "Issue #101 - Cannot read property '__$compiled' of undefined",
+    async: true,
+    options: {
+        asyncTimeout: 500
+    },
+    schema: null,
+    tests: [
+        {
+            description: "should fail with correct error",
+            data: null,
+            valid: false,
+            after: function (err) {
+                expect(err.message).toBe("Invalid .validate call - schema must be an string or object but null was passed!");
+            }
+        }
+    ]
+};

Diff for: test/spec/ZSchemaTestSuiteSpec.js

@@ -54,6 +54,7 @@ var testSuiteFiles = [
     require("../ZSchemaTestSuite/Issue94.js"),
     require("../ZSchemaTestSuite/Issue96.js"),
     require("../ZSchemaTestSuite/Issue98.js"),
+    require("../ZSchemaTestSuite/Issue101.js"),
     undefined
 ];
 
@@ -66,8 +67,8 @@ describe("ZSchemaTestSuite", function () {
         }
     }
 
-    it("should contain 48 files", function () {
-        expect(testSuiteFiles.length).toBe(48);
+    it("should contain 49 files", function () {
+        expect(testSuiteFiles.length).toBe(49);
     });
 
     testSuiteFiles.forEach(function (testSuite) {