jp.js

/*jslint indent: 2, maxlen: 80, continue: false, unparam: false */
/* -*- tab-width: 2 -*- */
/*global define: true, module: true, require: true */
((typeof define === 'function') && define.amd ? define : function (factory) {
  'use strict';
  var m = ((typeof module === 'object') && module), e = (m && m.exports);
  if (e) { m.exports = (factory(require, e, m) || m.exports); }
})(function () {
  'use strict';


  var EX = function parseJson(json, opts) {
    opts = (opts || false);
    var d = EX.dareParse(json);
    return (d.caught ? EX.hadErr(d.err, json, opts) : d.data);
  };


  EX.dareParse = function dareParse(json) {
    try {
      return { data: JSON.parse(json) };
    } catch (jsonParseErr) {
      return { caught: true, err: jsonParseErr };
    }
  };


  EX.hadErr = function hadErr(err, origJson, opts) {
    err = EX.chkErr(err, origJson);
    err.input = origJson;
    var hnd = (err.isSyntaxError ? opts.synErr : (opts.othErr || true));
    if (!hnd) { return hnd; }
    if (hnd === true) { throw err; }
    if (typeof hnd === 'function') { return hnd(err); }
    return hnd;
  };


  EX.chkErr = function chkErr(err, origJson) {
    var et = (err === null ? 'null' : typeof err), s, m, p;
    if (et !== 'object') {
      et = new Error('Caught a non-object (' + et + ') error: ' + String(err));
      et.origValue = err;
      et.isSyntaxError = false;
      return et;
    }
    s = String(err);
    err.isSyntaxError = ((err instanceof SyntaxError)
      || /^SyntaxError: /i.test(s));
    m = / in JSON at position (\d+)$/.exec(s);
    if (m) {
      if (!origJson) {
        if (origJson === '') { err.message += ' (input was empty)'; }
        return err;
      }
      origJson = String(origJson);
      p = origJson.slice(m[1] - 1);
      m = 128;
      if (p.length > m) {
        p = p.slice(0, m);
        m = '…';
      } else {
        m = '';
      }
      err.message += ': ' + JSON.stringify(p) + m;
    }
    return err;
  };






  return EX;
});