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1/*
2 http://www.JSON.org/json2.js
3 2008-09-01
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 This file creates a global JSON object containing two methods: stringify
12 and parse.
13
14 JSON.stringify(value, replacer, space)
15 value any JavaScript value, usually an object or array.
16
17 replacer an optional parameter that determines how object
18 values are stringified for objects. It can be a
19 function or an array of strings.
20
21 space an optional parameter that specifies the indentation
22 of nested structures. If it is omitted, the text will
23 be packed without extra whitespace. If it is a number,
24 it will specify the number of spaces to indent at each
25 level. If it is a string (such as '\t' or ' '),
26 it contains the characters used to indent at each level.
27
28 This method produces a JSON text from a JavaScript value.
29
30 When an object value is found, if the object contains a toJSON
31 method, its toJSON method will be called and the result will be
32 stringified. A toJSON method does not serialize: it returns the
33 value represented by the name/value pair that should be serialized,
34 or undefined if nothing should be serialized. The toJSON method
35 will be passed the key associated with the value, and this will be
36 bound to the object holding the key.
37
38 For example, this would serialize Dates as ISO strings.
39
40 Date.prototype.toJSON = function (key) {
41 function f(n) {
42 // Format integers to have at least two digits.
43 return n < 10 ? '0' + n : n;
44 }
45
46 return this.getUTCFullYear() + '-' +
47 f(this.getUTCMonth() + 1) + '-' +
48 f(this.getUTCDate()) + 'T' +
49 f(this.getUTCHours()) + ':' +
50 f(this.getUTCMinutes()) + ':' +
51 f(this.getUTCSeconds()) + 'Z';
52 };
53
54 You can provide an optional replacer method. It will be passed the
55 key and value of each member, with this bound to the containing
56 object. The value that is returned from your method will be
57 serialized. If your method returns undefined, then the member will
58 be excluded from the serialization.
59
60 If the replacer parameter is an array of strings, then it will be used to
61 select the members to be serialized. It filters the results such
62 that only members with keys listed in the replacer array are
63 stringified.
64
65 Values that do not have JSON representations, such as undefined or
66 functions, will not be serialized. Such values in objects will be
67 dropped; in arrays they will be replaced with null. You can use
68 a replacer function to replace those with JSON values.
69 JSON.stringify(undefined) returns undefined.
70
71 The optional space parameter produces a stringification of the
72 value that is filled with line breaks and indentation to make it
73 easier to read.
74
75 If the space parameter is a non-empty string, then that string will
76 be used for indentation. If the space parameter is a number, then
77 the indentation will be that many spaces.
78
79 Example:
80
81 text = JSON.stringify(['e', {pluribus: 'unum'}]);
82 // text is '["e",{"pluribus":"unum"}]'
83
84
85 text = JSON.stringify(['e', {pluribus: 'unum'}], null, '\t');
86 // text is '[\n\t"e",\n\t{\n\t\t"pluribus": "unum"\n\t}\n]'
87
88 text = JSON.stringify([new Date()], function (key, value) {
89 return this[key] instanceof Date ?
90 'Date(' + this[key] + ')' : value;
91 });
92 // text is '["Date(---current time---)"]'
93
94
95 JSON.parse(text, reviver)
96 This method parses a JSON text to produce an object or array.
97 It can throw a SyntaxError exception.
98
99 The optional reviver parameter is a function that can filter and
100 transform the results. It receives each of the keys and values,
101 and its return value is used instead of the original value.
102 If it returns what it received, then the structure is not modified.
103 If it returns undefined then the member is deleted.
104
105 Example:
106
107 // Parse the text. Values that look like ISO date strings will
108 // be converted to Date objects.
109
110 myData = JSON.parse(text, function (key, value) {
111 var a;
112 if (typeof value === 'string') {
113 a =
114/^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2}(?:\.\d*)?)Z$/.exec(value);
115 if (a) {
116 return new Date(Date.UTC(+a[1], +a[2] - 1, +a[3], +a[4],
117 +a[5], +a[6]));
118 }
119 }
120 return value;
121 });
122
123 myData = JSON.parse('["Date(09/09/2001)"]', function (key, value) {
124 var d;
125 if (typeof value === 'string' &&
126 value.slice(0, 5) === 'Date(' &&
127 value.slice(-1) === ')') {
128 d = new Date(value.slice(5, -1));
129 if (d) {
130 return d;
131 }
132 }
133 return value;
134 });
135
136
137 This is a reference implementation. You are free to copy, modify, or
138 redistribute.
139
140 This code should be minified before deployment.
141 See http://javascript.crockford.com/jsmin.html
142
143 USE YOUR OWN COPY. IT IS EXTREMELY UNWISE TO LOAD CODE FROM SERVERS YOU DO
144 NOT CONTROL.
145*/
146
147/*jslint evil: true */
148
149/*global JSON */
150
151/*members "", "\b", "\t", "\n", "\f", "\r", "\"", JSON, "\\", call,
152 charCodeAt, getUTCDate, getUTCFullYear, getUTCHours, getUTCMinutes,
153 getUTCMonth, getUTCSeconds, hasOwnProperty, join, lastIndex, length,
154 parse, propertyIsEnumerable, prototype, push, replace, slice, stringify,
155 test, toJSON, toString, valueOf
156*/
157
158// Create a JSON object only if one does not already exist. We create the
159// methods in a closure to avoid creating global variables.
160
161if (!this.JSON) {
162 JSON = {};
163}
164(function () {
165
166 function f(n) {
167 // Format integers to have at least two digits.
168 return n < 10 ? '0' + n : n;
169 }
170
171 if (typeof Date.prototype.toJSON !== 'function') {
172
173 Date.prototype.toJSON = function (key) {
174
175 return this.getUTCFullYear() + '-' +
176 f(this.getUTCMonth() + 1) + '-' +
177 f(this.getUTCDate()) + 'T' +
178 f(this.getUTCHours()) + ':' +
179 f(this.getUTCMinutes()) + ':' +
180 f(this.getUTCSeconds()) + 'Z';
181 };
182
183 String.prototype.toJSON =
184 Number.prototype.toJSON =
185 Boolean.prototype.toJSON = function (key) {
186 return this.valueOf();
187 };
188 }
189
190 var cx = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
191 escapeable = /[\\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
192 gap,
193 indent,
194 meta = { // table of character substitutions
195 '\b': '\\b',
196 '\t': '\\t',
197 '\n': '\\n',
198 '\f': '\\f',
199 '\r': '\\r',
200 '"' : '\\"',
201 '\\': '\\\\'
202 },
203 rep;
204
205
206 function quote(string) {
207
208// If the string contains no control characters, no quote characters, and no
209// backslash characters, then we can safely slap some quotes around it.
210// Otherwise we must also replace the offending characters with safe escape
211// sequences.
212
213 escapeable.lastIndex = 0;
214 return escapeable.test(string) ?
215 '"' + string.replace(escapeable, function (a) {
216 var c = meta[a];
217 if (typeof c === 'string') {
218 return c;
219 }
220 return '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
221 }) + '"' :
222 '"' + string + '"';
223 }
224
225
226 function str(key, holder) {
227
228// Produce a string from holder[key].
229
230 var i, // The loop counter.
231 k, // The member key.
232 v, // The member value.
233 length,
234 mind = gap,
235 partial,
236 value = holder[key];
237
238// If the value has a toJSON method, call it to obtain a replacement value.
239
240 if (value && typeof value === 'object' &&
241 typeof value.toJSON === 'function') {
242 value = value.toJSON(key);
243 }
244
245// If we were called with a replacer function, then call the replacer to
246// obtain a replacement value.
247
248 if (typeof rep === 'function') {
249 value = rep.call(holder, key, value);
250 }
251
252// What happens next depends on the value's type.
253
254 switch (typeof value) {
255 case 'string':
256 return quote(value);
257
258 case 'number':
259
260// JSON numbers must be finite. Encode non-finite numbers as null.
261
262 return isFinite(value) ? String(value) : 'null';
263
264 case 'boolean':
265 case 'null':
266
267// If the value is a boolean or null, convert it to a string. Note:
268// typeof null does not produce 'null'. The case is included here in
269// the remote chance that this gets fixed someday.
270
271 return String(value);
272
273// If the type is 'object', we might be dealing with an object or an array or
274// null.
275
276 case 'object':
277
278// Due to a specification blunder in ECMAScript, typeof null is 'object',
279// so watch out for that case.
280
281 if (!value) {
282 return 'null';
283 }
284
285// Make an array to hold the partial results of stringifying this object value.
286
287 gap += indent;
288 partial = [];
289
290// If the object has a dontEnum length property, we'll treat it as an array.
291
292 if (typeof value.length === 'number' &&
293 !value.propertyIsEnumerable('length')) {
294
295// The object 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 cx.lastIndex = 0;
437 if (cx.test(text)) {
438 text = text.replace(cx, function (a) {
439 return '\\u' +
440 ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
441 });
442 }
443
444// In the second stage, we run the text against regular expressions that look
445// for non-JSON patterns. We are especially concerned with '()' and 'new'
446// because they can cause invocation, and '=' because it can cause mutation.
447// But just to be safe, we want to reject all unexpected forms.
448
449// We split the second stage into 4 regexp operations in order to work around
450// crippling inefficiencies in IE's and Safari's regexp engines. First we
451// replace the JSON backslash pairs with '@' (a non-JSON character). Second, we
452// replace all simple value tokens with ']' characters. Third, we delete all
453// open brackets that follow a colon or comma or that begin the text. Finally,
454// we look to see that the remaining characters are only whitespace or ']' or
455// ',' or ':' or '{' or '}'. If that is so, then the text is safe for eval.
456
457 if (/^[\],:{}\s]*$/.
458test(text.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, '@').
459replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']').
460replace(/(?:^|:|,)(?:\s*\[)+/g, ''))) {
461
462// In the third stage we use the eval function to compile the text into a
463// JavaScript structure. The '{' operator is subject to a syntactic ambiguity
464// in JavaScript: it can begin a block or an object literal. We wrap the text
465// in parens to eliminate the ambiguity.
466
467 j = eval('(' + text + ')');
468
469// In the optional fourth stage, we recursively walk the new structure, passing
470// each name/value pair to a reviver function for possible transformation.
471
472 return typeof reviver === 'function' ?
473 walk({'': j}, '') : j;
474 }
475
476// If the text is not JSON parseable, then a SyntaxError is thrown.
477
478 throw new SyntaxError('JSON.parse');
479 };
480 }
481})(); \ No newline at end of file