1 /*

     2     http://www.JSON.org/json2.js

     3     2011-02-23

     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, strict: false, regexp: false */

   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 var JSON;

   163 if (!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' : null;

   186         };

   187 

   188         String.prototype.toJSON      =

   189             Number.prototype.toJSON  =

   190             Boolean.prototype.toJSON = function (key) {

   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' ? c :

   222                 '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4);

   223         }) + '"' : '"' + string + '"';

   224     }

   225 

   226 

   227     function str(key, holder) {

   228 

   229 // Produce a string from holder[key].

   230 

   231         var i,          // The loop counter.

   232             k,          // The member key.

   233             v,          // The member value.

   234             length,

   235             mind = gap,

   236             partial,

   237             value = holder[key];

   238 

   239 // If the value has a toJSON method, call it to obtain a replacement value.

   240 

   241         if (value && typeof value === 'object' &&

   242                 typeof value.toJSON === 'function') {

   243             value = value.toJSON(key);

   244         }

   245 

   246 // If we were called with a replacer function, then call the replacer to

   247 // obtain a replacement value.

   248 

   249         if (typeof rep === 'function') {

   250             value = rep.call(holder, key, value);

   251         }

   252 

   253 // What happens next depends on the value's type.

   254 

   255         switch (typeof value) {

   256         case 'string':

   257             return quote(value);

   258 

   259         case 'number':

   260 

   261 // JSON numbers must be finite. Encode non-finite numbers as null.

   262 

   263             return isFinite(value) ? String(value) : 'null';

   264 

   265         case 'boolean':

   266         case 'null':

   267 

   268 // If the value is a boolean or null, convert it to a string. Note:

   269 // typeof null does not produce 'null'. The case is included here in

   270 // the remote chance that this gets fixed someday.

   271 

   272             return String(value);

   273 

   274 // If the type is 'object', we might be dealing with an object or an array or

   275 // null.

   276 

   277         case 'object':

   278 

   279 // Due to a specification blunder in ECMAScript, typeof null is 'object',

   280 // so watch out for that case.

   281 

   282             if (!value) {

   283                 return 'null';

   284             }

   285 

   286 // Make an array to hold the partial results of stringifying this object value.

   287 

   288             gap += indent;

   289             partial = [];

   290 

   291 // Is the value an array?

   292 

   293             if (Object.prototype.toString.apply(value) === '[object Array]') {

   294 

   295 // The value 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 ? '[]' : gap ?

   307                     '[\n' + gap + partial.join(',\n' + gap) + '\n' + mind + ']' :

   308                     '[' + partial.join(',') + ']';

   309                 gap = mind;

   310                 return v;

   311             }

   312 

   313 // If the replacer is an array, use it to select the members to be stringified.

   314 

   315             if (rep && typeof rep === 'object') {

   316                 length = rep.length;

   317                 for (i = 0; i < length; i += 1) {

   318                     if (typeof rep[i] === 'string') {

   319                         k = rep[i];

   320                         v = str(k, value);

   321                         if (v) {

   322                             partial.push(quote(k) + (gap ? ': ' : ':') + v);

   323                         }

   324                     }

   325                 }

   326             } else {

   327 

   328 // Otherwise, iterate through all of the keys in the object.

   329 

   330                 for (k in value) {

   331                     if (Object.prototype.hasOwnProperty.call(value, k)) {

   332                         v = str(k, value);

   333                         if (v) {

   334                             partial.push(quote(k) + (gap ? ': ' : ':') + v);

   335                         }

   336                     }

   337                 }

   338             }

   339 

   340 // Join all of the member texts together, separated with commas,

   341 // and wrap them in braces.

   342 

   343             v = partial.length === 0 ? '{}' : gap ?

   344                 '{\n' + gap + partial.join(',\n' + gap) + '\n' + mind + '}' :

   345                 '{' + partial.join(',') + '}';

   346             gap = mind;

   347             return v;

   348         }

   349     }

   350 

   351 // If the JSON object does not yet have a stringify method, give it one.

   352 

   353     if (typeof JSON.stringify !== 'function') {

   354         JSON.stringify = function (value, replacer, space) {

   355 

   356 // The stringify method takes a value and an optional replacer, and an optional

   357 // space parameter, and returns a JSON text. The replacer can be a function

   358 // that can replace values, or an array of strings that will select the keys.

   359 // A default replacer method can be provided. Use of the space parameter can

   360 // produce text that is more easily readable.

   361 

   362             var i;

   363             gap = '';

   364             indent = '';

   365 

   366 // If the space parameter is a number, make an indent string containing that

   367 // many spaces.

   368 

   369             if (typeof space === 'number') {

   370                 for (i = 0; i < space; i += 1) {

   371                     indent += ' ';

   372                 }

   373 

   374 // If the space parameter is a string, it will be used as the indent string.

   375 

   376             } else if (typeof space === 'string') {

   377                 indent = space;

   378             }

   379 

   380 // If there is a replacer, it must be a function or an array.

   381 // Otherwise, throw an error.

   382 

   383             rep = replacer;

   384             if (replacer && typeof replacer !== 'function' &&

   385                     (typeof replacer !== 'object' ||

   386                     typeof replacer.length !== 'number')) {

   387                 throw new Error('JSON.stringify');

   388             }

   389 

   390 // Make a fake root object containing our value under the key of ''.

   391 // Return the result of stringifying the value.

   392 

   393             return str('', {'': value});

   394         };

   395     }

   396 

   397 

   398 // If the JSON object does not yet have a parse method, give it one.

   399 

   400     if (typeof JSON.parse !== 'function') {

   401         JSON.parse = function (text, reviver) {

   402 

   403 // The parse method takes a text and an optional reviver function, and returns

   404 // a JavaScript value if the text is a valid JSON text.

   405 

   406             var j;

   407 

   408             function walk(holder, key) {

   409 

   410 // The walk method is used to recursively walk the resulting structure so

   411 // that modifications can be made.

   412 

   413                 var k, v, value = holder[key];

   414                 if (value && typeof value === 'object') {

   415                     for (k in value) {

   416                         if (Object.prototype.hasOwnProperty.call(value, k)) {

   417                             v = walk(value, k);

   418                             if (v !== undefined) {

   419                                 value[k] = v;

   420                             } else {

   421                                 delete value[k];

   422                             }

   423                         }

   424                     }

   425                 }

   426                 return reviver.call(holder, key, value);

   427             }

   428 

   429 

   430 // Parsing happens in four stages. In the first stage, we replace certain

   431 // Unicode characters with escape sequences. JavaScript handles many characters

   432 // incorrectly, either silently deleting them, or treating them as line endings.

   433 

   434             text = String(text);

   435             cx.lastIndex = 0;

   436             if (cx.test(text)) {

   437                 text = text.replace(cx, function (a) {

   438                     return '\\u' +

   439                         ('0000' + a.charCodeAt(0).toString(16)).slice(-4);

   440                 });

   441             }

   442 

   443 // In the second stage, we run the text against regular expressions that look

   444 // for non-JSON patterns. We are especially concerned with '()' and 'new'

   445 // because they can cause invocation, and '=' because it can cause mutation.

   446 // But just to be safe, we want to reject all unexpected forms.

   447 

   448 // We split the second stage into 4 regexp operations in order to work around

   449 // crippling inefficiencies in IE's and Safari's regexp engines. First we

   450 // replace the JSON backslash pairs with '@' (a non-JSON character). Second, we

   451 // replace all simple value tokens with ']' characters. Third, we delete all

   452 // open brackets that follow a colon or comma or that begin the text. Finally,

   453 // we look to see that the remaining characters are only whitespace or ']' or

   454 // ',' or ':' or '{' or '}'. If that is so, then the text is safe for eval.

   455 

   456             if (/^[\],:{}\s]*$/

   457                     .test(text.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, '@')

   458                         .replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']')

   459                         .replace(/(?:^|:|,)(?:\s*\[)+/g, ''))) {

   460 

   461 // In the third stage we use the eval function to compile the text into a

   462 // JavaScript structure. The '{' operator is subject to a syntactic ambiguity

   463 // in JavaScript: it can begin a block or an object literal. We wrap the text

   464 // in parens to eliminate the ambiguity.

   465 

   466                 j = eval('(' + text + ')');

   467 

   468 // In the optional fourth stage, we recursively walk the new structure, passing

   469 // each name/value pair to a reviver function for possible transformation.

   470 

   471                 return typeof reviver === 'function' ?

   472                     walk({'': j}, '') : j;

   473             }

   474 

   475 // If the text is not JSON parseable, then a SyntaxError is thrown.

   476 

   477             throw new SyntaxError('JSON.parse');

   478         };

   479     }

   480 }());