1 /*
  2     http://www.JSON.org/json2.js
  3     2011-02-23
  4 
  5     Public Domain.
  6 
  7     NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK.
  8 
  9     See http://www.JSON.org/js.html
 10 
 11 
 12     This code should be minified before deployment.
 13     See http://javascript.crockford.com/jsmin.html
 14 
 15     USE YOUR OWN COPY. IT IS EXTREMELY UNWISE TO LOAD CODE FROM SERVERS YOU DO
 16     NOT CONTROL.
 17 
 18 
 19     This file creates a global JSON object containing two methods: stringify
 20     and parse.
 21 
 22         JSON.stringify(value, replacer, space)
 23             value       any JavaScript value, usually an object or array.
 24 
 25             replacer    an optional parameter that determines how object
 26                         values are stringified for objects. It can be a
 27                         function or an array of strings.
 28 
 29             space       an optional parameter that specifies the indentation
 30                         of nested structures. If it is omitted, the text will
 31                         be packed without extra whitespace. If it is a number,
 32                         it will specify the number of spaces to indent at each
 33                         level. If it is a string (such as '\t' or ' '),
 34                         it contains the characters used to indent at each level.
 35 
 36             This method produces a JSON text from a JavaScript value.
 37 
 38             When an object value is found, if the object contains a toJSON
 39             method, its toJSON method will be called and the result will be
 40             stringified. A toJSON method does not serialize: it returns the
 41             value represented by the name/value pair that should be serialized,
 42             or undefined if nothing should be serialized. The toJSON method
 43             will be passed the key associated with the value, and this will be
 44             bound to the value
 45 
 46             For example, this would serialize Dates as ISO strings.
 47 
 48                 Date.prototype.toJSON = function (key) {
 49                     function f(n) {
 50                         // Format integers to have at least two digits.
 51                         return n < 10 ? '0' + n : n;
 52                     }
 53 
 54                     return this.getUTCFullYear()   + '-' +
 55                          f(this.getUTCMonth() + 1) + '-' +
 56                          f(this.getUTCDate())      + 'T' +
 57                          f(this.getUTCHours())     + ':' +
 58                          f(this.getUTCMinutes())   + ':' +
 59                          f(this.getUTCSeconds())   + 'Z';
 60                 };
 61 
 62             You can provide an optional replacer method. It will be passed the
 63             key and value of each member, with this bound to the containing
 64             object. The value that is returned from your method will be
 65             serialized. If your method returns undefined, then the member will
 66             be excluded from the serialization.
 67 
 68             If the replacer parameter is an array of strings, then it will be
 69             used to select the members to be serialized. It filters the results
 70             such that only members with keys listed in the replacer array are
 71             stringified.
 72 
 73             Values that do not have JSON representations, such as undefined or
 74             functions, will not be serialized. Such values in objects will be
 75             dropped; in arrays they will be replaced with null. You can use
 76             a replacer function to replace those with JSON values.
 77             JSON.stringify(undefined) returns undefined.
 78 
 79             The optional space parameter produces a stringification of the
 80             value that is filled with line breaks and indentation to make it
 81             easier to read.
 82 
 83             If the space parameter is a non-empty string, then that string will
 84             be used for indentation. If the space parameter is a number, then
 85             the indentation will be that many spaces.
 86 
 87             Example:
 88 
 89             text = JSON.stringify(['e', {pluribus: 'unum'}]);
 90             // text is '["e",{"pluribus":"unum"}]'
 91 
 92 
 93             text = JSON.stringify(['e', {pluribus: 'unum'}], null, '\t');
 94             // text is '[\n\t"e",\n\t{\n\t\t"pluribus": "unum"\n\t}\n]'
 95 
 96             text = JSON.stringify([new Date()], function (key, value) {
 97                 return this[key] instanceof Date ?
 98                     'Date(' + this[key] + ')' : value;
 99             });
100             // text is '["Date(---current time---)"]'
101 
102 
103         JSON.parse(text, reviver)
104             This method parses a JSON text to produce an object or array.
105             It can throw a SyntaxError exception.
106 
107             The optional reviver parameter is a function that can filter and
108             transform the results. It receives each of the keys and values,
109             and its return value is used instead of the original value.
110             If it returns what it received, then the structure is not modified.
111             If it returns undefined then the member is deleted.
112 
113             Example:
114 
115             // Parse the text. Values that look like ISO date strings will
116             // be converted to Date objects.
117 
118             myData = JSON.parse(text, function (key, value) {
119                 var a;
120                 if (typeof value === 'string') {
121                     a =
122 /^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2}(?:\.\d*)?)Z$/.exec(value);
123                     if (a) {
124                         return new Date(Date.UTC(+a[1], +a[2] - 1, +a[3], +a[4],
125                             +a[5], +a[6]));
126                     }
127                 }
128                 return value;
129             });
130 
131             myData = JSON.parse('["Date(09/09/2001)"]', function (key, value) {
132                 var d;
133                 if (typeof value === 'string' &&
134                         value.slice(0, 5) === 'Date(' &&
135                         value.slice(-1) === ')') {
136                     d = new Date(value.slice(5, -1));
137                     if (d) {
138                         return d;
139                     }
140                 }
141                 return value;
142             });
143 
144 
145     This is a reference implementation. You are free to copy, modify, or
146     redistribute.
147 */
148 
149 /*jslint evil: true, strict: false, regexp: false */
150 
151 /*members "", "\b", "\t", "\n", "\f", "\r", "\"", JSON, "\\", apply,
152     call, charCodeAt, getUTCDate, getUTCFullYear, getUTCHours,
153     getUTCMinutes, getUTCMonth, getUTCSeconds, hasOwnProperty, join,
154     lastIndex, length, parse, prototype, push, replace, slice, stringify,
155     test, toJSON, toString, valueOf
156 */
157 
158 
159 // Create a JSON object only if one does not already exist. We create the
160 // methods in a closure to avoid creating global variables.
161 
162 var JSON;
163 if (!JSON) {
164     JSON = {};
165 }
166 
167 (function () {
168     "use strict";
169 
170     function f(n) {
171         // Format integers to have at least two digits.
172         return n < 10 ? '0' + n : n;
173     }
174 
175     if (typeof Date.prototype.toJSON !== 'function') {
176 
177         Date.prototype.toJSON = function (key) {
178 
179             return isFinite(this.valueOf()) ?
180                 this.getUTCFullYear()     + '-' +
181                 f(this.getUTCMonth() + 1) + '-' +
182                 f(this.getUTCDate())      + 'T' +
183                 f(this.getUTCHours())     + ':' +
184                 f(this.getUTCMinutes())   + ':' +
185                 f(this.getUTCSeconds())   + 'Z' : null;
186         };
187 
188         String.prototype.toJSON      =
189             Number.prototype.toJSON  =
190             Boolean.prototype.toJSON = function (key) {
191                 return this.valueOf();
192             };
193     }
194 
195     var cx = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
196         escapable = /[\\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
197         gap,
198         indent,
199         meta = {    // table of character substitutions
200             '\b': '\\b',
201             '\t': '\\t',
202             '\n': '\\n',
203             '\f': '\\f',
204             '\r': '\\r',
205             '"' : '\\"',
206             '\\': '\\\\'
207         },
208         rep;
209 
210 
211     function quote(string) {
212 
213 // If the string contains no control characters, no quote characters, and no
214 // backslash characters, then we can safely slap some quotes around it.
215 // Otherwise we must also replace the offending characters with safe escape
216 // sequences.
217 
218         escapable.lastIndex = 0;
219         return escapable.test(string) ? '"' + string.replace(escapable, function (a) {
220             var c = meta[a];
221             return typeof c === 'string' ? c :
222                 '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
223         }) + '"' : '"' + string + '"';
224     }
225 
226 
227     function str(key, holder) {
228 
229 // Produce a string from holder[key].
230 
231         var i,          // The loop counter.
232             k,          // The member key.
233             v,          // The member value.
234             length,
235             mind = gap,
236             partial,
237             value = holder[key];
238 
239 // If the value has a toJSON method, call it to obtain a replacement value.
240 
241         if (value && typeof value === 'object' &&
242                 typeof value.toJSON === 'function') {
243             value = value.toJSON(key);
244         }
245 
246 // If we were called with a replacer function, then call the replacer to
247 // obtain a replacement value.
248 
249         if (typeof rep === 'function') {
250             value = rep.call(holder, key, value);
251         }
252 
253 // What happens next depends on the value's type.
254 
255         switch (typeof value) {
256         case 'string':
257             return quote(value);
258 
259         case 'number':
260 
261 // JSON numbers must be finite. Encode non-finite numbers as null.
262 
263             return isFinite(value) ? String(value) : 'null';
264 
265         case 'boolean':
266         case 'null':
267 
268 // If the value is a boolean or null, convert it to a string. Note:
269 // typeof null does not produce 'null'. The case is included here in
270 // the remote chance that this gets fixed someday.
271 
272             return String(value);
273 
274 // If the type is 'object', we might be dealing with an object or an array or
275 // null.
276 
277         case 'object':
278 
279 // Due to a specification blunder in ECMAScript, typeof null is 'object',
280 // so watch out for that case.
281 
282             if (!value) {
283                 return 'null';
284             }
285 
286 // Make an array to hold the partial results of stringifying this object value.
287 
288             gap += indent;
289             partial = [];
290 
291 // Is the value an array?
292 
293             if (Object.prototype.toString.apply(value) === '[object Array]') {
294 
295 // The value is an array. Stringify every element. Use null as a placeholder
296 // for non-JSON values.
297 
298                 length = value.length;
299                 for (i = 0; i < length; i += 1) {
300                     partial[i] = str(i, value) || 'null';
301                 }
302 
303 // Join all of the elements together, separated with commas, and wrap them in
304 // brackets.
305 
306                 v = partial.length === 0 ? '[]' : gap ?
307                     '[\n' + gap + partial.join(',\n' + gap) + '\n' + mind + ']' :
308                     '[' + partial.join(',') + ']';
309                 gap = mind;
310                 return v;
311             }
312 
313 // If the replacer is an array, use it to select the members to be stringified.
314 
315             if (rep && typeof rep === 'object') {
316                 length = rep.length;
317                 for (i = 0; i < length; i += 1) {
318                     if (typeof rep[i] === 'string') {
319                         k = rep[i];
320                         v = str(k, value);
321                         if (v) {
322                             partial.push(quote(k) + (gap ? ': ' : ':') + v);
323                         }
324                     }
325                 }
326             } else {
327 
328 // Otherwise, iterate through all of the keys in the object.
329 
330                 for (k in value) {
331                     if (Object.prototype.hasOwnProperty.call(value, k)) {
332                         v = str(k, value);
333                         if (v) {
334                             partial.push(quote(k) + (gap ? ': ' : ':') + v);
335                         }
336                     }
337                 }
338             }
339 
340 // Join all of the member texts together, separated with commas,
341 // and wrap them in braces.
342 
343             v = partial.length === 0 ? '{}' : gap ?
344                 '{\n' + gap + partial.join(',\n' + gap) + '\n' + mind + '}' :
345                 '{' + partial.join(',') + '}';
346             gap = mind;
347             return v;
348         }
349     }
350 
351 // If the JSON object does not yet have a stringify method, give it one.
352 
353     if (typeof JSON.stringify !== 'function') {
354         JSON.stringify = function (value, replacer, space) {
355 
356 // The stringify method takes a value and an optional replacer, and an optional
357 // space parameter, and returns a JSON text. The replacer can be a function
358 // that can replace values, or an array of strings that will select the keys.
359 // A default replacer method can be provided. Use of the space parameter can
360 // produce text that is more easily readable.
361 
362             var i;
363             gap = '';
364             indent = '';
365 
366 // If the space parameter is a number, make an indent string containing that
367 // many spaces.
368 
369             if (typeof space === 'number') {
370                 for (i = 0; i < space; i += 1) {
371                     indent += ' ';
372                 }
373 
374 // If the space parameter is a string, it will be used as the indent string.
375 
376             } else if (typeof space === 'string') {
377                 indent = space;
378             }
379 
380 // If there is a replacer, it must be a function or an array.
381 // Otherwise, throw an error.
382 
383             rep = replacer;
384             if (replacer && typeof replacer !== 'function' &&
385                     (typeof replacer !== 'object' ||
386                     typeof replacer.length !== 'number')) {
387                 throw new Error('JSON.stringify');
388             }
389 
390 // Make a fake root object containing our value under the key of ''.
391 // Return the result of stringifying the value.
392 
393             return str('', {'': value});
394         };
395     }
396 
397 
398 // If the JSON object does not yet have a parse method, give it one.
399 
400     if (typeof JSON.parse !== 'function') {
401         JSON.parse = function (text, reviver) {
402 
403 // The parse method takes a text and an optional reviver function, and returns
404 // a JavaScript value if the text is a valid JSON text.
405 
406             var j;
407 
408             function walk(holder, key) {
409 
410 // The walk method is used to recursively walk the resulting structure so
411 // that modifications can be made.
412 
413                 var k, v, value = holder[key];
414                 if (value && typeof value === 'object') {
415                     for (k in value) {
416                         if (Object.prototype.hasOwnProperty.call(value, k)) {
417                             v = walk(value, k);
418                             if (v !== undefined) {
419                                 value[k] = v;
420                             } else {
421                                 delete value[k];
422                             }
423                         }
424                     }
425                 }
426                 return reviver.call(holder, key, value);
427             }
428 
429 
430 // Parsing happens in four stages. In the first stage, we replace certain
431 // Unicode characters with escape sequences. JavaScript handles many characters
432 // incorrectly, either silently deleting them, or treating them as line endings.
433 
434             text = String(text);
435             cx.lastIndex = 0;
436             if (cx.test(text)) {
437                 text = text.replace(cx, function (a) {
438                     return '\\u' +
439                         ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
440                 });
441             }
442 
443 // In the second stage, we run the text against regular expressions that look
444 // for non-JSON patterns. We are especially concerned with '()' and 'new'
445 // because they can cause invocation, and '=' because it can cause mutation.
446 // But just to be safe, we want to reject all unexpected forms.
447 
448 // We split the second stage into 4 regexp operations in order to work around
449 // crippling inefficiencies in IE's and Safari's regexp engines. First we
450 // replace the JSON backslash pairs with '@' (a non-JSON character). Second, we
451 // replace all simple value tokens with ']' characters. Third, we delete all
452 // open brackets that follow a colon or comma or that begin the text. Finally,
453 // we look to see that the remaining characters are only whitespace or ']' or
454 // ',' or ':' or '{' or '}'. If that is so, then the text is safe for eval.
455 
456             if (/^[\],:{}\s]*$/
457                     .test(text.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, '@')
458                         .replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']')
459                         .replace(/(?:^|:|,)(?:\s*\[)+/g, ''))) {
460 
461 // In the third stage we use the eval function to compile the text into a
462 // JavaScript structure. The '{' operator is subject to a syntactic ambiguity
463 // in JavaScript: it can begin a block or an object literal. We wrap the text
464 // in parens to eliminate the ambiguity.
465 
466                 j = eval('(' + text + ')');
467 
468 // In the optional fourth stage, we recursively walk the new structure, passing
469 // each name/value pair to a reviver function for possible transformation.
470 
471                 return typeof reviver === 'function' ?
472                     walk({'': j}, '') : j;
473             }
474 
475 // If the text is not JSON parseable, then a SyntaxError is thrown.
476 
477             throw new SyntaxError('JSON.parse');
478         };
479     }
480 }());
481 
482 
483 // Do not enumerate the new JSON methods.
484 // (These lines are not included in the original code by Crockford.)
485 Object.prototype.dontEnum("toJSONString");
486 Object.prototype.dontEnum("parseJSON");
487 
488 /**
489  * Create a JSONP-compatible response from the callback name and the desired data.
490  * @param {String} callback The name of the JSONP callback method
491  * @param {Object} data An arbitrary JavaScript object
492  */
493 JSON.pad = function(data, callback) {
494    if (!callback) {
495       return;
496    }
497    return callback + "(" + JSON.stringify(data) + ")";
498 }
499 
500 /**
501  * Send a JSONP-compatible response if a the request contains callback data.
502  * This works out-of-the-box with jQuery but can be customized using the key argument.
503  * @param {Object} data An arbitrary JavaScript object
504  * @param {String} key The name of the property in req.data containing the JSONP callback method name
505  * @param {Boolean} resume Switch to define whether further processing should be continued or not
506  */
507 JSON.sendPaddedResponse = function(data, key, resume) {
508    var callback = req.data[key || "callback"];
509    if (callback) {
510       res.contentType = "text/javascript";
511       res.write(JSON.pad(data, callback));
512       resume || res.stop();
513    }
514    return;
515 }
516