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/services/sync/tps/extensions/mozmill/resource/stdlib/json2.js

http://github.com/zpao/v8monkey
JavaScript | 469 lines | 303 code | 10 blank | 156 comment | 1 complexity | 1ac31c1f8ca6962835ecf6d13c45181e MD5 | raw file
  1/*
  2    http://www.JSON.org/json2.js
  3    2008-05-25
  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 without a toJSON
 19                        method. It can be a function or an array.
 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, 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
156*/
157
158var EXPORTED_SYMBOLS = ["JSON"];
159
160// Create a JSON object only if one does not already exist. We create the
161// object in a closure to avoid creating global variables.
162
163    JSON = function () {
164
165        function f(n) {
166            // Format integers to have at least two digits.
167            return n < 10 ? '0' + n : n;
168        }
169
170        Date.prototype.toJSON = function (key) {
171
172            return this.getUTCFullYear()   + '-' +
173                 f(this.getUTCMonth() + 1) + '-' +
174                 f(this.getUTCDate())      + 'T' +
175                 f(this.getUTCHours())     + ':' +
176                 f(this.getUTCMinutes())   + ':' +
177                 f(this.getUTCSeconds())   + 'Z';
178        };
179
180        var cx = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
181            escapeable = /[\\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
182            gap,
183            indent,
184            meta = {    // table of character substitutions
185                '\b': '\\b',
186                '\t': '\\t',
187                '\n': '\\n',
188                '\f': '\\f',
189                '\r': '\\r',
190                '"' : '\\"',
191                '\\': '\\\\'
192            },
193            rep;
194
195
196        function quote(string) {
197
198// If the string contains no control characters, no quote characters, and no
199// backslash characters, then we can safely slap some quotes around it.
200// Otherwise we must also replace the offending characters with safe escape
201// sequences.
202
203            escapeable.lastIndex = 0;
204            return escapeable.test(string) ?
205                '"' + string.replace(escapeable, function (a) {
206                    var c = meta[a];
207                    if (typeof c === 'string') {
208                        return c;
209                    }
210                    return '\\u' + ('0000' +
211                            (+(a.charCodeAt(0))).toString(16)).slice(-4);
212                }) + '"' :
213                '"' + string + '"';
214        }
215
216
217        function str(key, holder) {
218
219// Produce a string from holder[key].
220
221            var i,          // The loop counter.
222                k,          // The member key.
223                v,          // The member value.
224                length,
225                mind = gap,
226                partial,
227                value = holder[key];
228
229// If the value has a toJSON method, call it to obtain a replacement value.
230
231            if (value && typeof value === 'object' &&
232                    typeof value.toJSON === 'function') {
233                value = value.toJSON(key);
234            }
235
236// If we were called with a replacer function, then call the replacer to
237// obtain a replacement value.
238
239            if (typeof rep === 'function') {
240                value = rep.call(holder, key, value);
241            }
242
243// What happens next depends on the value's type.
244
245            switch (typeof value) {
246            case 'string':
247                return quote(value);
248
249            case 'number':
250
251// JSON numbers must be finite. Encode non-finite numbers as null.
252
253                return isFinite(value) ? String(value) : 'null';
254
255            case 'boolean':
256            case 'null':
257
258// If the value is a boolean or null, convert it to a string. Note:
259// typeof null does not produce 'null'. The case is included here in
260// the remote chance that this gets fixed someday.
261
262                return String(value);
263
264// If the type is 'object', we might be dealing with an object or an array or
265// null.
266
267            case 'object':
268
269// Due to a specification blunder in ECMAScript, typeof null is 'object',
270// so watch out for that case.
271
272                if (!value) {
273                    return 'null';
274                }
275
276// Make an array to hold the partial results of stringifying this object value.
277
278                gap += indent;
279                partial = [];
280
281// If the object has a dontEnum length property, we'll treat it as an array.
282
283                if (typeof value.length === 'number' &&
284                        !(value.propertyIsEnumerable('length'))) {
285
286// The object is an array. Stringify every element. Use null as a placeholder
287// for non-JSON values.
288
289                    length = value.length;
290                    for (i = 0; i < length; i += 1) {
291                        partial[i] = str(i, value) || 'null';
292                    }
293
294// Join all of the elements together, separated with commas, and wrap them in
295// brackets.
296
297                    v = partial.length === 0 ? '[]' :
298                        gap ? '[\n' + gap +
299                                partial.join(',\n' + gap) + '\n' +
300                                    mind + ']' :
301                              '[' + partial.join(',') + ']';
302                    gap = mind;
303                    return v;
304                }
305
306// If the replacer is an array, use it to select the members to be stringified.
307
308                if (rep && typeof rep === 'object') {
309                    length = rep.length;
310                    for (i = 0; i < length; i += 1) {
311                        k = rep[i];
312                        if (typeof k === 'string') {
313                            v = str(k, value, rep);
314                            if (v) {
315                                partial.push(quote(k) + (gap ? ': ' : ':') + v);
316                            }
317                        }
318                    }
319                } else {
320
321// Otherwise, iterate through all of the keys in the object.
322
323                    for (k in value) {
324                        if (Object.hasOwnProperty.call(value, k)) {
325                            v = str(k, value, rep);
326                            if (v) {
327                                partial.push(quote(k) + (gap ? ': ' : ':') + v);
328                            }
329                        }
330                    }
331                }
332
333// Join all of the member texts together, separated with commas,
334// and wrap them in braces.
335
336                v = partial.length === 0 ? '{}' :
337                    gap ? '{\n' + gap + partial.join(',\n' + gap) + '\n' +
338                            mind + '}' : '{' + partial.join(',') + '}';
339                gap = mind;
340                return v;
341            }
342        }
343
344// Return the JSON object containing the stringify and parse methods.
345
346        return {
347            stringify: function (value, replacer, space) {
348
349// The stringify method takes a value and an optional replacer, and an optional
350// space parameter, and returns a JSON text. The replacer can be a function
351// that can replace values, or an array of strings that will select the keys.
352// A default replacer method can be provided. Use of the space parameter can
353// produce text that is more easily readable.
354
355                var i;
356                gap = '';
357                indent = '';
358
359// If the space parameter is a number, make an indent string containing that
360// many spaces.
361
362                if (typeof space === 'number') {
363                    for (i = 0; i < space; i += 1) {
364                        indent += ' ';
365                    }
366
367// If the space parameter is a string, it will be used as the indent string.
368
369                } else if (typeof space === 'string') {
370                    indent = space;
371                }
372
373// If there is a replacer, it must be a function or an array.
374// Otherwise, throw an error.
375
376                rep = replacer;
377                if (replacer && typeof replacer !== 'function' &&
378                        (typeof replacer !== 'object' ||
379                         typeof replacer.length !== 'number')) {
380                    throw new Error('JSON.stringify');
381                }
382
383// Make a fake root object containing our value under the key of ''.
384// Return the result of stringifying the value.
385
386                return str('', {'': value});
387            },
388
389
390            parse: function (text, reviver) {
391
392// The parse method takes a text and an optional reviver function, and returns
393// a JavaScript value if the text is a valid JSON text.
394
395                var j;
396
397                function walk(holder, key) {
398
399// The walk method is used to recursively walk the resulting structure so
400// that modifications can be made.
401
402                    var k, v, value = holder[key];
403                    if (value && typeof value === 'object') {
404                        for (k in value) {
405                            if (Object.hasOwnProperty.call(value, k)) {
406                                v = walk(value, k);
407                                if (v !== undefined) {
408                                    value[k] = v;
409                                } else {
410                                    delete value[k];
411                                }
412                            }
413                        }
414                    }
415                    return reviver.call(holder, key, value);
416                }
417
418
419// Parsing happens in four stages. In the first stage, we replace certain
420// Unicode characters with escape sequences. JavaScript handles many characters
421// incorrectly, either silently deleting them, or treating them as line endings.
422
423                cx.lastIndex = 0;
424                if (cx.test(text)) {
425                    text = text.replace(cx, function (a) {
426                        return '\\u' + ('0000' +
427                                (+(a.charCodeAt(0))).toString(16)).slice(-4);
428                    });
429                }
430
431// In the second stage, we run the text against regular expressions that look
432// for non-JSON patterns. We are especially concerned with '()' and 'new'
433// because they can cause invocation, and '=' because it can cause mutation.
434// But just to be safe, we want to reject all unexpected forms.
435
436// We split the second stage into 4 regexp operations in order to work around
437// crippling inefficiencies in IE's and Safari's regexp engines. First we
438// replace the JSON backslash pairs with '@' (a non-JSON character). Second, we
439// replace all simple value tokens with ']' characters. Third, we delete all
440// open brackets that follow a colon or comma or that begin the text. Finally,
441// we look to see that the remaining characters are only whitespace or ']' or
442// ',' or ':' or '{' or '}'. If that is so, then the text is safe for eval.
443
444                if (/^[\],:{}\s]*$/.
445test(text.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, '@').
446replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']').
447replace(/(?:^|:|,)(?:\s*\[)+/g, ''))) {
448
449// In the third stage we use the eval function to compile the text into a
450// JavaScript structure. The '{' operator is subject to a syntactic ambiguity
451// in JavaScript: it can begin a block or an object literal. We wrap the text
452// in parens to eliminate the ambiguity.
453
454                    j = eval('(' + text + ')');
455
456// In the optional fourth stage, we recursively walk the new structure, passing
457// each name/value pair to a reviver function for possible transformation.
458
459                    return typeof reviver === 'function' ?
460                        walk({'': j}, '') : j;
461                }
462
463// If the text is not JSON parseable, then a SyntaxError is thrown.
464
465                throw new SyntaxError('JSON.parse');
466            }
467        };
468    }();
469