2 http://www.JSON.org/json2.js
7 NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK.
9 See http://www.JSON.org/js.html
11 This file creates a global JSON object containing three methods: stringify,
15 JSON.stringify(value, replacer, space)
16 value any JavaScript value, usually an object or array.
18 replacer an optional parameter that determines how object
19 values are stringified for objects without a toJSON
20 method. It can be a function or an array.
22 space an optional parameter that specifies the indentation
23 of nested structures. If it is omitted, the text will
24 be packed without extra whitespace. If it is a number,
25 it will specify the number of spaces to indent at each
26 level. If it is a string (such as '\t'), it contains the
27 characters used to indent at each level.
29 This method produces a JSON text from a JavaScript value.
31 When an object value is found, if the object contains a toJSON
32 method, its toJSON method will be called and the result will be
33 stringified. A toJSON method does not serialize: it returns the
34 value represented by the name/value pair that should be serialized,
35 or undefined if nothing should be serialized. The toJSON method will
36 be passed the key associated with the value, and this will be bound
37 to the object holding the key.
39 This is the toJSON method added to Dates:
41 function toJSON(key) {
42 return this.getUTCFullYear() + '-' +
43 f(this.getUTCMonth() + 1) + '-' +
44 f(this.getUTCDate()) + 'T' +
45 f(this.getUTCHours()) + ':' +
46 f(this.getUTCMinutes()) + ':' +
47 f(this.getUTCSeconds()) + 'Z';
50 You can provide an optional replacer method. It will be passed the
51 key and value of each member, with this bound to the containing
52 object. The value that is returned from your method will be
53 serialized. If your method returns undefined, then the member will
54 be excluded from the serialization.
56 If no replacer parameter is provided, then a default replacer
59 function replacer(key, value) {
60 return Object.hasOwnProperty.call(this, key) ?
64 The default replacer is passed the key and value for each item in
65 the structure. It excludes inherited members.
67 If the replacer parameter is an array, then it will be used to
68 select the members to be serialized. It filters the results such
69 that only members with keys listed in the replacer array are
72 Values that do not have JSON representaions, such as undefined or
73 functions, will not be serialized. Such values in objects will be
74 dropped; in arrays they will be replaced with null. You can use
75 a replacer function to replace those with JSON values.
76 JSON.stringify(undefined) returns undefined.
78 The optional space parameter produces a stringification of the value
79 that is filled with line breaks and indentation to make it easier to
82 If the space parameter is a non-empty string, then that string will
83 be used for indentation. If the space parameter is a number, then
84 then indentation will be that many spaces.
88 text = JSON.stringify(['e', {pluribus: 'unum'}]);
89 // text is '["e",{"pluribus":"unum"}]'
92 text = JSON.stringify(['e', {pluribus: 'unum'}], null, '\t');
93 // text is '[\n\t"e",\n\t{\n\t\t"pluribus": "unum"\n\t}\n]'
96 JSON.parse(text, reviver)
97 This method parses a JSON text to produce an object or array.
98 It can throw a SyntaxError exception.
100 The optional reviver parameter is a function that can filter and
101 transform the results. It receives each of the keys and values,
102 and its return value is used instead of the original value.
103 If it returns what it received, then the structure is not modified.
104 If it returns undefined then the member is deleted.
108 // Parse the text. Values that look like ISO date strings will
109 // be converted to Date objects.
111 myData = JSON.parse(text, function (key, value) {
113 if (typeof value === 'string') {
115 /^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2}(?:\.\d*)?)Z$/.exec(value);
117 return new Date(Date.UTC(+a[1], +a[2] - 1, +a[3], +a[4],
126 This method wraps a string in quotes, escaping some characters
130 This is a reference implementation. You are free to copy, modify, or
133 USE YOUR OWN COPY. IT IS EXTREMELY UNWISE TO LOAD THIRD PARTY
134 CODE INTO YOUR PAGES.
137 /*jslint regexp: true, forin: true, evil: true */
141 /*members "", "\b", "\t", "\n", "\f", "\r", "\"", JSON, "\\", apply,
142 call, charCodeAt, floor, getUTCDate, getUTCFullYear, getUTCHours,
143 getUTCMinutes, getUTCMonth, getUTCSeconds, hasOwnProperty, join, length,
144 parse, propertyIsEnumerable, prototype, push, quote, replace, stringify,
145 test, toJSON, toString
150 // Create a JSON object only if one does not already exist. We create the
151 // object in a closure to avoid global variables.
155 function f(n
) { // Format integers to have at least two digits.
156 return n
< 10 ? '0' + n : n
;
159 Date
.prototype.toJSON = function () {
161 // Eventually, this method will be based on the date.toISOString method.
163 return this.getUTCFullYear() + '-' +
164 f(this.getUTCMonth() + 1) + '-' +
165 f(this.getUTCDate()) + 'T' +
166 f(this.getUTCHours()) + ':' +
167 f(this.getUTCMinutes()) + ':' +
168 f(this.getUTCSeconds()) + 'Z';
172 var escapeable
= /["\\\x00-\x1f\x7f-\x9f]/g,
175 meta
= { // table of character substitutions
187 function quote(string
) {
189 // If the string contains no control characters, no quote characters, and no
190 // backslash characters, then we can safely slap some quotes around it.
191 // Otherwise we must also replace the offending characters with safe escape
194 return escapeable
.test(string
) ?
195 '"' + string
.replace(escapeable
, function (a
) {
197 if (typeof c
=== 'string') {
201 return '\\u00' + Math
.floor(c
/ 16).toString(16) +
202 (c
% 16).toString(16);
208 function str(key
, holder
) {
210 // Produce a string from holder[key].
212 var i
, // The loop counter.
213 k
, // The member key.
214 v
, // The member value.
220 // If the value has a toJSON method, call it to obtain a replacement value.
222 if (value
&& typeof value
=== 'object' &&
223 typeof value
.toJSON
=== 'function') {
224 value
= value
.toJSON(key
);
227 // If we were called with a replacer function, then call the replacer to
228 // obtain a replacement value.
230 if (typeof rep
=== 'function') {
231 value
= rep
.call(holder
, key
, value
);
234 // What happens next depends on the value's type.
236 switch (typeof value
) {
242 // JSON numbers must be finite. Encode non-finite numbers as null.
244 return isFinite(value
) ? String(value
) : 'null';
249 // If the value is a boolean or null, convert it to a string. Note:
250 // typeof null does not produce 'null'. The case is included here in
251 // the remote chance that this gets fixed someday.
253 return String(value
);
255 // If the type is 'object', we might be dealing with an object or an array or
260 // Due to a specification blunder in ECMAScript, typeof null is 'object',
261 // so watch out for that case.
267 // Make an array to hold the partial results of stringifying this object value.
272 // If the object has a dontEnum length property, we'll treat it as an array.
274 if (typeof value
.length
=== 'number' &&
275 !(value
.propertyIsEnumerable('length'))) {
277 // The object is an array. Stringify every element. Use null as a placeholder
278 // for non-JSON values.
280 length
= value
.length
;
281 for (i
= 0; i
< length
; i
+= 1) {
282 partial
[i
] = str(i
, value
) || 'null';
285 // Join all of the elements together, separated with commas, and wrap them in
288 v
= partial
.length
=== 0 ? '[]' :
289 gap
? '[\n' + gap
+ partial
.join(',\n' + gap
) +
291 '[' + partial
.join(',') + ']';
296 // If the replacer is an array, use it to select the members to be stringified.
298 if (typeof rep
=== 'object') {
300 for (i
= 0; i
< length
; i
+= 1) {
302 if (typeof k
=== 'string') {
303 v
= str(k
, value
, rep
);
305 partial
.push(quote(k
) + (gap
? ': ' : ':') + v
);
311 // Otherwise, iterate through all of the keys in the object.
314 v
= str(k
, value
, rep
);
316 partial
.push(quote(k
) + (gap
? ': ' : ':') + v
);
321 // Join all of the member texts together, separated with commas,
322 // and wrap them in braces.
324 v
= partial
.length
=== 0 ? '{}' :
325 gap
? '{\n' + gap
+ partial
.join(',\n' + gap
) +
327 '{' + partial
.join(',') + '}';
334 // Return the JSON object containing the stringify, parse, and quote methods.
337 stringify: function (value
, replacer
, space
) {
339 // The stringify method takes a value and an optional replacer, and an optional
340 // space parameter, and returns a JSON text. The replacer can be a function
341 // that can replace values, or an array of strings that will select the keys.
342 // A default replacer method can be provided. Use of the space parameter can
343 // produce text that is more easily readable.
350 // If the space parameter is a number, make an indent string containing that
353 if (typeof space
=== 'number') {
354 for (i
= 0; i
< space
; i
+= 1) {
358 // If the space parameter is a string, it will be used as the indent string.
360 } else if (typeof space
=== 'string') {
365 // If there is no replacer parameter, use the default replacer.
368 rep = function (key
, value
) {
369 if (!Object
.hasOwnProperty
.call(this, key
)) {
375 // The replacer can be a function or an array. Otherwise, throw an error.
377 } else if (typeof replacer
=== 'function' ||
378 (typeof replacer
=== 'object' &&
379 typeof replacer
.length
=== 'number')) {
382 throw new Error('JSON.stringify');
385 // Make a fake root object containing our value under the key of ''.
386 // Return the result of stringifying the value.
388 return str('', {'': value
});
392 parse: function (text
, reviver
) {
394 // The parse method takes a text and an optional reviver function, and returns
395 // a JavaScript value if the text is a valid JSON text.
399 function walk(holder
, key
) {
401 // The walk method is used to recursively walk the resulting structure so
402 // that modifications can be made.
404 var k
, v
, value
= holder
[key
];
405 if (value
&& typeof value
=== 'object') {
407 if (Object
.hasOwnProperty
.call(value
, k
)) {
409 if (v
!== undefined) {
417 return reviver
.call(holder
, key
, value
);
421 // Parsing happens in three stages. In the first stage, we run the text against
422 // regular expressions that look for non-JSON patterns. We are especially
423 // concerned with '()' and 'new' because they can cause invocation, and '='
424 // because it can cause mutation. But just to be safe, we want to reject all
427 // We split the first stage into 4 regexp operations in order to work around
428 // crippling inefficiencies in IE's and Safari's regexp engines. First we
429 // replace all backslash pairs with '@' (a non-JSON character). Second, we
430 // replace all simple value tokens with ']' characters. Third, we delete all
431 // open brackets that follow a colon or comma or that begin the text. Finally,
432 // we look to see that the remaining characters are only whitespace or ']' or
433 // ',' or ':' or '{' or '}'. If that is so, then the text is safe for eval.
435 if (/^[\],:{}\s]*$/.test(text
.replace(/\\["\\\/bfnrtu]/g, '@').
436 replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']').
437 replace(/(?:^|:|,)(?:\s*\[)+/g, ''))) {
439 // In the second stage we use the eval function to compile the text into a
440 // JavaScript structure. The '{' operator is subject to a syntactic ambiguity
441 // in JavaScript: it can begin a block or an object literal. We wrap the text
442 // in parens to eliminate the ambiguity.
444 j
= eval('(' + text
+ ')');
446 // In the optional third stage, we recursively walk the new structure, passing
447 // each name/value pair to a reviver function for possible transformation.
449 return typeof reviver
=== 'function' ?
450 walk({'': j
}, '') : j
;
453 // If the text is not JSON parseable, then a SyntaxError is thrown.
455 throw new SyntaxError('JSON.parse');