Lines 1-486
Link Here
|
1 |
/* |
|
|
2 |
json2.js |
3 |
2013-05-26 |
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, regexp: true */ |
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 (typeof JSON !== 'object') { |
163 |
JSON = {}; |
164 |
} |
165 |
|
166 |
(function () { |
167 |
'use strict'; |
168 |
|
169 |
function f(n) { |
170 |
// Format integers to have at least two digits. |
171 |
return n < 10 ? '0' + n : n; |
172 |
} |
173 |
|
174 |
if (typeof Date.prototype.toJSON !== 'function') { |
175 |
|
176 |
Date.prototype.toJSON = function () { |
177 |
|
178 |
return isFinite(this.valueOf()) |
179 |
? this.getUTCFullYear() + '-' + |
180 |
f(this.getUTCMonth() + 1) + '-' + |
181 |
f(this.getUTCDate()) + 'T' + |
182 |
f(this.getUTCHours()) + ':' + |
183 |
f(this.getUTCMinutes()) + ':' + |
184 |
f(this.getUTCSeconds()) + 'Z' |
185 |
: null; |
186 |
}; |
187 |
|
188 |
String.prototype.toJSON = |
189 |
Number.prototype.toJSON = |
190 |
Boolean.prototype.toJSON = function () { |
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' |
222 |
? c |
223 |
: '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4); |
224 |
}) + '"' : '"' + string + '"'; |
225 |
} |
226 |
|
227 |
|
228 |
function str(key, holder) { |
229 |
|
230 |
// Produce a string from holder[key]. |
231 |
|
232 |
var i, // The loop counter. |
233 |
k, // The member key. |
234 |
v, // The member value. |
235 |
length, |
236 |
mind = gap, |
237 |
partial, |
238 |
value = holder[key]; |
239 |
|
240 |
// If the value has a toJSON method, call it to obtain a replacement value. |
241 |
|
242 |
if (value && typeof value === 'object' && |
243 |
typeof value.toJSON === 'function') { |
244 |
value = value.toJSON(key); |
245 |
} |
246 |
|
247 |
// If we were called with a replacer function, then call the replacer to |
248 |
// obtain a replacement value. |
249 |
|
250 |
if (typeof rep === 'function') { |
251 |
value = rep.call(holder, key, value); |
252 |
} |
253 |
|
254 |
// What happens next depends on the value's type. |
255 |
|
256 |
switch (typeof value) { |
257 |
case 'string': |
258 |
return quote(value); |
259 |
|
260 |
case 'number': |
261 |
|
262 |
// JSON numbers must be finite. Encode non-finite numbers as null. |
263 |
|
264 |
return isFinite(value) ? String(value) : 'null'; |
265 |
|
266 |
case 'boolean': |
267 |
case 'null': |
268 |
|
269 |
// If the value is a boolean or null, convert it to a string. Note: |
270 |
// typeof null does not produce 'null'. The case is included here in |
271 |
// the remote chance that this gets fixed someday. |
272 |
|
273 |
return String(value); |
274 |
|
275 |
// If the type is 'object', we might be dealing with an object or an array or |
276 |
// null. |
277 |
|
278 |
case 'object': |
279 |
|
280 |
// Due to a specification blunder in ECMAScript, typeof null is 'object', |
281 |
// so watch out for that case. |
282 |
|
283 |
if (!value) { |
284 |
return 'null'; |
285 |
} |
286 |
|
287 |
// Make an array to hold the partial results of stringifying this object value. |
288 |
|
289 |
gap += indent; |
290 |
partial = []; |
291 |
|
292 |
// Is the value an array? |
293 |
|
294 |
if (Object.prototype.toString.apply(value) === '[object Array]') { |
295 |
|
296 |
// The value is an array. Stringify every element. Use null as a placeholder |
297 |
// for non-JSON values. |
298 |
|
299 |
length = value.length; |
300 |
for (i = 0; i < length; i += 1) { |
301 |
partial[i] = str(i, value) || 'null'; |
302 |
} |
303 |
|
304 |
// Join all of the elements together, separated with commas, and wrap them in |
305 |
// brackets. |
306 |
|
307 |
v = partial.length === 0 |
308 |
? '[]' |
309 |
: gap |
310 |
? '[\n' + gap + partial.join(',\n' + gap) + '\n' + mind + ']' |
311 |
: '[' + partial.join(',') + ']'; |
312 |
gap = mind; |
313 |
return v; |
314 |
} |
315 |
|
316 |
// If the replacer is an array, use it to select the members to be stringified. |
317 |
|
318 |
if (rep && typeof rep === 'object') { |
319 |
length = rep.length; |
320 |
for (i = 0; i < length; i += 1) { |
321 |
if (typeof rep[i] === 'string') { |
322 |
k = rep[i]; |
323 |
v = str(k, value); |
324 |
if (v) { |
325 |
partial.push(quote(k) + (gap ? ': ' : ':') + v); |
326 |
} |
327 |
} |
328 |
} |
329 |
} else { |
330 |
|
331 |
// Otherwise, iterate through all of the keys in the object. |
332 |
|
333 |
for (k in value) { |
334 |
if (Object.prototype.hasOwnProperty.call(value, k)) { |
335 |
v = str(k, value); |
336 |
if (v) { |
337 |
partial.push(quote(k) + (gap ? ': ' : ':') + v); |
338 |
} |
339 |
} |
340 |
} |
341 |
} |
342 |
|
343 |
// Join all of the member texts together, separated with commas, |
344 |
// and wrap them in braces. |
345 |
|
346 |
v = partial.length === 0 |
347 |
? '{}' |
348 |
: gap |
349 |
? '{\n' + gap + partial.join(',\n' + gap) + '\n' + mind + '}' |
350 |
: '{' + partial.join(',') + '}'; |
351 |
gap = mind; |
352 |
return v; |
353 |
} |
354 |
} |
355 |
|
356 |
// If the JSON object does not yet have a stringify method, give it one. |
357 |
|
358 |
if (typeof JSON.stringify !== 'function') { |
359 |
JSON.stringify = function (value, replacer, space) { |
360 |
|
361 |
// The stringify method takes a value and an optional replacer, and an optional |
362 |
// space parameter, and returns a JSON text. The replacer can be a function |
363 |
// that can replace values, or an array of strings that will select the keys. |
364 |
// A default replacer method can be provided. Use of the space parameter can |
365 |
// produce text that is more easily readable. |
366 |
|
367 |
var i; |
368 |
gap = ''; |
369 |
indent = ''; |
370 |
|
371 |
// If the space parameter is a number, make an indent string containing that |
372 |
// many spaces. |
373 |
|
374 |
if (typeof space === 'number') { |
375 |
for (i = 0; i < space; i += 1) { |
376 |
indent += ' '; |
377 |
} |
378 |
|
379 |
// If the space parameter is a string, it will be used as the indent string. |
380 |
|
381 |
} else if (typeof space === 'string') { |
382 |
indent = space; |
383 |
} |
384 |
|
385 |
// If there is a replacer, it must be a function or an array. |
386 |
// Otherwise, throw an error. |
387 |
|
388 |
rep = replacer; |
389 |
if (replacer && typeof replacer !== 'function' && |
390 |
(typeof replacer !== 'object' || |
391 |
typeof replacer.length !== 'number')) { |
392 |
throw new Error('JSON.stringify'); |
393 |
} |
394 |
|
395 |
// Make a fake root object containing our value under the key of ''. |
396 |
// Return the result of stringifying the value. |
397 |
|
398 |
return str('', {'': value}); |
399 |
}; |
400 |
} |
401 |
|
402 |
|
403 |
// If the JSON object does not yet have a parse method, give it one. |
404 |
|
405 |
if (typeof JSON.parse !== 'function') { |
406 |
JSON.parse = function (text, reviver) { |
407 |
|
408 |
// The parse method takes a text and an optional reviver function, and returns |
409 |
// a JavaScript value if the text is a valid JSON text. |
410 |
|
411 |
var j; |
412 |
|
413 |
function walk(holder, key) { |
414 |
|
415 |
// The walk method is used to recursively walk the resulting structure so |
416 |
// that modifications can be made. |
417 |
|
418 |
var k, v, value = holder[key]; |
419 |
if (value && typeof value === 'object') { |
420 |
for (k in value) { |
421 |
if (Object.prototype.hasOwnProperty.call(value, k)) { |
422 |
v = walk(value, k); |
423 |
if (v !== undefined) { |
424 |
value[k] = v; |
425 |
} else { |
426 |
delete value[k]; |
427 |
} |
428 |
} |
429 |
} |
430 |
} |
431 |
return reviver.call(holder, key, value); |
432 |
} |
433 |
|
434 |
|
435 |
// Parsing happens in four stages. In the first stage, we replace certain |
436 |
// Unicode characters with escape sequences. JavaScript handles many characters |
437 |
// incorrectly, either silently deleting them, or treating them as line endings. |
438 |
|
439 |
text = String(text); |
440 |
cx.lastIndex = 0; |
441 |
if (cx.test(text)) { |
442 |
text = text.replace(cx, function (a) { |
443 |
return '\\u' + |
444 |
('0000' + a.charCodeAt(0).toString(16)).slice(-4); |
445 |
}); |
446 |
} |
447 |
|
448 |
// In the second stage, we run the text against regular expressions that look |
449 |
// for non-JSON patterns. We are especially concerned with '()' and 'new' |
450 |
// because they can cause invocation, and '=' because it can cause mutation. |
451 |
// But just to be safe, we want to reject all unexpected forms. |
452 |
|
453 |
// We split the second stage into 4 regexp operations in order to work around |
454 |
// crippling inefficiencies in IE's and Safari's regexp engines. First we |
455 |
// replace the JSON backslash pairs with '@' (a non-JSON character). Second, we |
456 |
// replace all simple value tokens with ']' characters. Third, we delete all |
457 |
// open brackets that follow a colon or comma or that begin the text. Finally, |
458 |
// we look to see that the remaining characters are only whitespace or ']' or |
459 |
// ',' or ':' or '{' or '}'. If that is so, then the text is safe for eval. |
460 |
|
461 |
if (/^[\],:{}\s]*$/ |
462 |
.test(text.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, '@') |
463 |
.replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']') |
464 |
.replace(/(?:^|:|,)(?:\s*\[)+/g, ''))) { |
465 |
|
466 |
// In the third stage we use the eval function to compile the text into a |
467 |
// JavaScript structure. The '{' operator is subject to a syntactic ambiguity |
468 |
// in JavaScript: it can begin a block or an object literal. We wrap the text |
469 |
// in parens to eliminate the ambiguity. |
470 |
|
471 |
j = eval('(' + text + ')'); |
472 |
|
473 |
// In the optional fourth stage, we recursively walk the new structure, passing |
474 |
// each name/value pair to a reviver function for possible transformation. |
475 |
|
476 |
return typeof reviver === 'function' |
477 |
? walk({'': j}, '') |
478 |
: j; |
479 |
} |
480 |
|
481 |
// If the text is not JSON parseable, then a SyntaxError is thrown. |
482 |
|
483 |
throw new SyntaxError('JSON.parse'); |
484 |
}; |
485 |
} |
486 |
}()); |