1 /*
2 http://www.JSON.org/json2.js
3 2010-03-20
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 */
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 if (!this.JSON) {
163 this.JSON = {};
164 }
165
166 (function () {
167
168 function f(n) {
169 // Format integers to have at least two digits.
170 return n < 10 ? '0' + n : n;
171 }
172
173 if (typeof Date.prototype.toJSON !== 'function') {
174
175 Date.prototype.toJSON = function (key) {
176
177 return isFinite(this.valueOf()) ?
178 this.getUTCFullYear() + '-' +
179 f(this.getUTCMonth() + 1) + '-' +
180 f(this.getUTCDate()) + 'T' +
181 f(this.getUTCHours()) + ':' +
182 f(this.getUTCMinutes()) + ':' +
183 f(this.getUTCSeconds()) + 'Z' : null;
184 };
185
186 String.prototype.toJSON =
187 Number.prototype.toJSON =
188 Boolean.prototype.toJSON = function (key) {
189 return this.valueOf();
190 };
191 }
192
193 var cx = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
194 escapable = /[\\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
195 gap,
196 indent,
197 meta = { // table of character substitutions
198 '\b': '\\b',
199 '\t': '\\t',
200 '\n': '\\n',
201 '\f': '\\f',
202 '\r': '\\r',
203 '"' : '\\"',
204 '\\': '\\\\'
205 },
206 rep;
207
208
209 function quote(string) {
210
211 // If the string contains no control characters, no quote characters, and no
212 // backslash characters, then we can safely slap some quotes around it.
213 // Otherwise we must also replace the offending characters with safe escape
214 // sequences.
215
216 escapable.lastIndex = 0;
217 return escapable.test(string) ?
218 '"' + string.replace(escapable, function (a) {
219 var c = meta[a];
220 return typeof c === 'string' ? c :
221 '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
222 }) + '"' :
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 ? '[]' :
307 gap ? '[\n' + gap +
308 partial.join(',\n' + gap) + '\n' +
309 mind + ']' :
310 '[' + partial.join(',') + ']';
311 gap = mind;
312 return v;
313 }
314
315 // If the replacer is an array, use it to select the members to be stringified.
316
317 if (rep && typeof rep === 'object') {
318 length = rep.length;
319 for (i = 0; i < length; i += 1) {
320 k = rep[i];
321 if (typeof k === 'string') {
322 v = str(k, value);
323 if (v) {
324 partial.push(quote(k) + (gap ? ': ' : ':') + v);
325 }
326 }
327 }
328 } else {
329
330 // Otherwise, iterate through all of the keys in the object.
331
332 for (k in value) {
333 if (Object.hasOwnProperty.call(value, k)) {
334 v = str(k, value);
335 if (v) {
336 partial.push(quote(k) + (gap ? ': ' : ':') + v);
337 }
338 }
339 }
340 }
341
342 // Join all of the member texts together, separated with commas,
343 // and wrap them in braces.
344
345 v = partial.length === 0 ? '{}' :
346 gap ? '{\n' + gap + partial.join(',\n' + gap) + '\n' +
347 mind + '}' : '{' + partial.join(',') + '}';
348 gap = mind;
349 return v;
350 }
351 }
352
353 // If the JSON object does not yet have a stringify method, give it one.
354
355 if (typeof JSON.stringify !== 'function') {
356 JSON.stringify = function (value, replacer, space) {
357
358 // The stringify method takes a value and an optional replacer, and an optional
359 // space parameter, and returns a JSON text. The replacer can be a function
360 // that can replace values, or an array of strings that will select the keys.
361 // A default replacer method can be provided. Use of the space parameter can
362 // produce text that is more easily readable.
363
364 var i;
365 gap = '';
366 indent = '';
367
368 // If the space parameter is a number, make an indent string containing that
369 // many spaces.
370
371 if (typeof space === 'number') {
372 for (i = 0; i < space; i += 1) {
373 indent += ' ';
374 }
375
376 // If the space parameter is a string, it will be used as the indent string.
377
378 } else if (typeof space === 'string') {
379 indent = space;
380 }
381
382 // If there is a replacer, it must be a function or an array.
383 // Otherwise, throw an error.
384
385 rep = replacer;
386 if (replacer && typeof replacer !== 'function' &&
387 (typeof replacer !== 'object' ||
388 typeof replacer.length !== 'number')) {
389 throw new Error('JSON.stringify');
390 }
391
392 // Make a fake root object containing our value under the key of ''.
393 // Return the result of stringifying the value.
394
395 return str('', {'': value});
396 };
397 }
398
399
400 // If the JSON object does not yet have a parse method, give it one.
401
402 if (typeof JSON.parse !== 'function') {
403 JSON.parse = function (text, reviver) {
404
405 // The parse method takes a text and an optional reviver function, and returns
406 // a JavaScript value if the text is a valid JSON text.
407
408 var j;
409
410 function walk(holder, key) {
411
412 // The walk method is used to recursively walk the resulting structure so
413 // that modifications can be made.
414
415 var k, v, value = holder[key];
416 if (value && typeof value === 'object') {
417 for (k in value) {
418 if (Object.hasOwnProperty.call(value, k)) {
419 v = walk(value, k);
420 if (v !== undefined) {
421 value[k] = v;
422 } else {
423 delete value[k];
424 }
425 }
426 }
427 }
428 return reviver.call(holder, key, value);
429 }
430
431
432 // Parsing happens in four stages. In the first stage, we replace certain
433 // Unicode characters with escape sequences. JavaScript handles many characters
434 // incorrectly, either silently deleting them, or treating them as line endings.
435
436 text = String(text);
437 cx.lastIndex = 0;
438 if (cx.test(text)) {
439 text = text.replace(cx, function (a) {
440 return '\\u' +
441 ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
442 });
443 }
444
445 // In the second stage, we run the text against regular expressions that look
446 // for non-JSON patterns. We are especially concerned with '()' and 'new'
447 // because they can cause invocation, and '=' because it can cause mutation.
448 // But just to be safe, we want to reject all unexpected forms.
449
450 // We split the second stage into 4 regexp operations in order to work around
451 // crippling inefficiencies in IE's and Safari's regexp engines. First we
452 // replace the JSON backslash pairs with '@' (a non-JSON character). Second, we
453 // replace all simple value tokens with ']' characters. Third, we delete all
454 // open brackets that follow a colon or comma or that begin the text. Finally,
455 // we look to see that the remaining characters are only whitespace or ']' or
456 // ',' or ':' or '{' or '}'. If that is so, then the text is safe for eval.
457
458 if (/^[\],:{}\s]*$/.
459 test(text.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, '@').
460 replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']').
461 replace(/(?:^|:|,)(?:\s*\[)+/g, ''))) {
462
463 // In the third stage we use the eval function to compile the text into a
464 // JavaScript structure. The '{' operator is subject to a syntactic ambiguity
465 // in JavaScript: it can begin a block or an object literal. We wrap the text
466 // in parens to eliminate the ambiguity.
467
468 j = eval('(' + text + ')');
469
470 // In the optional fourth stage, we recursively walk the new structure, passing
471 // each name/value pair to a reviver function for possible transformation.
472
473 return typeof reviver === 'function' ?
474 walk({'': j}, '') : j;
475 }
476
477 // If the text is not JSON parseable, then a SyntaxError is thrown.
478
479 throw new SyntaxError('JSON.parse');
480 };
481 }
482 }());
