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/BlogEngine/BlogEngine.NET/Scripts/json2.js

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JavaScript | 487 lines | 318 code | 12 blank | 157 comment | 2 complexity | 2ee84c1e82528e5e09c645cf07c97877 MD5 | raw file
  1/*
  2    http://www.JSON.org/json2.js
  3    2011-10-19
  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
162var JSON;
163if (!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'
186                : null;
187        };
188
189        String.prototype.toJSON      =
190            Number.prototype.toJSON  =
191            Boolean.prototype.toJSON = function (key) {
192                return this.valueOf();
193            };
194    }
195
196    var cx = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
197        escapable = /[\\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
198        gap,
199        indent,
200        meta = {    // table of character substitutions
201            '\b': '\\b',
202            '\t': '\\t',
203            '\n': '\\n',
204            '\f': '\\f',
205            '\r': '\\r',
206            '"' : '\\"',
207            '\\': '\\\\'
208        },
209        rep;
210
211
212    function quote(string) {
213
214// If the string contains no control characters, no quote characters, and no
215// backslash characters, then we can safely slap some quotes around it.
216// Otherwise we must also replace the offending characters with safe escape
217// sequences.
218
219        escapable.lastIndex = 0;
220        return escapable.test(string) ? '"' + string.replace(escapable, function (a) {
221            var c = meta[a];
222            return typeof c === 'string'
223                ? c
224                : '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
225        }) + '"' : '"' + string + '"';
226    }
227
228
229    function str(key, holder) {
230
231// Produce a string from holder[key].
232
233        var i,          // The loop counter.
234            k,          // The member key.
235            v,          // The member value.
236            length,
237            mind = gap,
238            partial,
239            value = holder[key];
240
241// If the value has a toJSON method, call it to obtain a replacement value.
242
243        if (value && typeof value === 'object' &&
244                typeof value.toJSON === 'function') {
245            value = value.toJSON(key);
246        }
247
248// If we were called with a replacer function, then call the replacer to
249// obtain a replacement value.
250
251        if (typeof rep === 'function') {
252            value = rep.call(holder, key, value);
253        }
254
255// What happens next depends on the value's type.
256
257        switch (typeof value) {
258        case 'string':
259            return quote(value);
260
261        case 'number':
262
263// JSON numbers must be finite. Encode non-finite numbers as null.
264
265            return isFinite(value) ? String(value) : 'null';
266
267        case 'boolean':
268        case 'null':
269
270// If the value is a boolean or null, convert it to a string. Note:
271// typeof null does not produce 'null'. The case is included here in
272// the remote chance that this gets fixed someday.
273
274            return String(value);
275
276// If the type is 'object', we might be dealing with an object or an array or
277// null.
278
279        case 'object':
280
281// Due to a specification blunder in ECMAScript, typeof null is 'object',
282// so watch out for that case.
283
284            if (!value) {
285                return 'null';
286            }
287
288// Make an array to hold the partial results of stringifying this object value.
289
290            gap += indent;
291            partial = [];
292
293// Is the value an array?
294
295            if (Object.prototype.toString.apply(value) === '[object Array]') {
296
297// The value is an array. Stringify every element. Use null as a placeholder
298// for non-JSON values.
299
300                length = value.length;
301                for (i = 0; i < length; i += 1) {
302                    partial[i] = str(i, value) || 'null';
303                }
304
305// Join all of the elements together, separated with commas, and wrap them in
306// brackets.
307
308                v = partial.length === 0
309                    ? '[]'
310                    : gap
311                    ? '[\n' + gap + partial.join(',\n' + gap) + '\n' + mind + ']'
312                    : '[' + partial.join(',') + ']';
313                gap = mind;
314                return v;
315            }
316
317// If the replacer is an array, use it to select the members to be stringified.
318
319            if (rep && typeof rep === 'object') {
320                length = rep.length;
321                for (i = 0; i < length; i += 1) {
322                    if (typeof rep[i] === 'string') {
323                        k = rep[i];
324                        v = str(k, value);
325                        if (v) {
326                            partial.push(quote(k) + (gap ? ': ' : ':') + v);
327                        }
328                    }
329                }
330            } else {
331
332// Otherwise, iterate through all of the keys in the object.
333
334                for (k in value) {
335                    if (Object.prototype.hasOwnProperty.call(value, k)) {
336                        v = str(k, value);
337                        if (v) {
338                            partial.push(quote(k) + (gap ? ': ' : ':') + v);
339                        }
340                    }
341                }
342            }
343
344// Join all of the member texts together, separated with commas,
345// and wrap them in braces.
346
347            v = partial.length === 0
348                ? '{}'
349                : gap
350                ? '{\n' + gap + partial.join(',\n' + gap) + '\n' + mind + '}'
351                : '{' + partial.join(',') + '}';
352            gap = mind;
353            return v;
354        }
355    }
356
357// If the JSON object does not yet have a stringify method, give it one.
358
359    if (typeof JSON.stringify !== 'function') {
360        JSON.stringify = function (value, replacer, space) {
361
362// The stringify method takes a value and an optional replacer, and an optional
363// space parameter, and returns a JSON text. The replacer can be a function
364// that can replace values, or an array of strings that will select the keys.
365// A default replacer method can be provided. Use of the space parameter can
366// produce text that is more easily readable.
367
368            var i;
369            gap = '';
370            indent = '';
371
372// If the space parameter is a number, make an indent string containing that
373// many spaces.
374
375            if (typeof space === 'number') {
376                for (i = 0; i < space; i += 1) {
377                    indent += ' ';
378                }
379
380// If the space parameter is a string, it will be used as the indent string.
381
382            } else if (typeof space === 'string') {
383                indent = space;
384            }
385
386// If there is a replacer, it must be a function or an array.
387// Otherwise, throw an error.
388
389            rep = replacer;
390            if (replacer && typeof replacer !== 'function' &&
391                    (typeof replacer !== 'object' ||
392                    typeof replacer.length !== 'number')) {
393                throw new Error('JSON.stringify');
394            }
395
396// Make a fake root object containing our value under the key of ''.
397// Return the result of stringifying the value.
398
399            return str('', {'': value});
400        };
401    }
402
403
404// If the JSON object does not yet have a parse method, give it one.
405
406    if (typeof JSON.parse !== 'function') {
407        JSON.parse = function (text, reviver) {
408
409// The parse method takes a text and an optional reviver function, and returns
410// a JavaScript value if the text is a valid JSON text.
411
412            var j;
413
414            function walk(holder, key) {
415
416// The walk method is used to recursively walk the resulting structure so
417// that modifications can be made.
418
419                var k, v, value = holder[key];
420                if (value && typeof value === 'object') {
421                    for (k in value) {
422                        if (Object.prototype.hasOwnProperty.call(value, k)) {
423                            v = walk(value, k);
424                            if (v !== undefined) {
425                                value[k] = v;
426                            } else {
427                                delete value[k];
428                            }
429                        }
430                    }
431                }
432                return reviver.call(holder, key, value);
433            }
434
435
436// Parsing happens in four stages. In the first stage, we replace certain
437// Unicode characters with escape sequences. JavaScript handles many characters
438// incorrectly, either silently deleting them, or treating them as line endings.
439
440            text = String(text);
441            cx.lastIndex = 0;
442            if (cx.test(text)) {
443                text = text.replace(cx, function (a) {
444                    return '\\u' +
445                        ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
446                });
447            }
448
449// In the second stage, we run the text against regular expressions that look
450// for non-JSON patterns. We are especially concerned with '()' and 'new'
451// because they can cause invocation, and '=' because it can cause mutation.
452// But just to be safe, we want to reject all unexpected forms.
453
454// We split the second stage into 4 regexp operations in order to work around
455// crippling inefficiencies in IE's and Safari's regexp engines. First we
456// replace the JSON backslash pairs with '@' (a non-JSON character). Second, we
457// replace all simple value tokens with ']' characters. Third, we delete all
458// open brackets that follow a colon or comma or that begin the text. Finally,
459// we look to see that the remaining characters are only whitespace or ']' or
460// ',' or ':' or '{' or '}'. If that is so, then the text is safe for eval.
461
462            if (/^[\],:{}\s]*$/
463                    .test(text.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, '@')
464                        .replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']')
465                        .replace(/(?:^|:|,)(?:\s*\[)+/g, ''))) {
466
467// In the third stage we use the eval function to compile the text into a
468// JavaScript structure. The '{' operator is subject to a syntactic ambiguity
469// in JavaScript: it can begin a block or an object literal. We wrap the text
470// in parens to eliminate the ambiguity.
471
472                j = eval('(' + text + ')');
473
474// In the optional fourth stage, we recursively walk the new structure, passing
475// each name/value pair to a reviver function for possible transformation.
476
477                return typeof reviver === 'function'
478                    ? walk({'': j}, '')
479                    : j;
480            }
481
482// If the text is not JSON parseable, then a SyntaxError is thrown.
483
484            throw new SyntaxError('JSON.parse');
485        };
486    }
487}());