jsroute/json2.js

   1 /*
   2     http://www.JSON.org/json2.js
   3     2010-03-20
   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 '&nbsp;'),
  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 */
 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 (!this.JSON) {
 163     this.JSON = {};
 164 }
 165
 166 (function () {
 167
 168     function f(n) {
 169         // Format integers to have at least two digits.
 170         return n < 10 ? '0' + n : n;
 171     }
 172
 173     if (typeof Date.prototype.toJSON !== 'function') {
 174
 175         Date.prototype.toJSON = function (key) {
 176
 177             return isFinite(this.valueOf()) ?
 178                    this.getUTCFullYear()   + '-' +
 179                  f(this.getUTCMonth() + 1) + '-' +
 180                  f(this.getUTCDate())      + 'T' +
 181                  f(this.getUTCHours())     + ':' +
 182                  f(this.getUTCMinutes())   + ':' +
 183                  f(this.getUTCSeconds())   + 'Z' : null;
 184         };
 185
 186         String.prototype.toJSON =
 187         Number.prototype.toJSON =
 188         Boolean.prototype.toJSON = function (key) {
 189             return this.valueOf();
 190         };
 191     }
 192
 193     var cx = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
 194         escapable = /[\\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
 195         gap,
 196         indent,
 197         meta = {    // table of character substitutions
 198             '\b': '\\b',
 199             '\t': '\\t',
 200             '\n': '\\n',
 201             '\f': '\\f',
 202             '\r': '\\r',
 203             '"' : '\\"',
 204             '\\': '\\\\'
 205         },
 206         rep;
 207
 208
 209     function quote(string) {
 210
 211 // If the string contains no control characters, no quote characters, and no
 212 // backslash characters, then we can safely slap some quotes around it.
 213 // Otherwise we must also replace the offending characters with safe escape
 214 // sequences.
 215
 216         escapable.lastIndex = 0;
 217         return escapable.test(string) ?
 218             '"' + string.replace(escapable, function (a) {
 219                 var c = meta[a];
 220                 return typeof c === 'string' ? c :
 221                     '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
 222             }) + '"' :
 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 ? '[]' :
 307                     gap ? '[\n' + gap +
 308                             partial.join(',\n' + gap) + '\n' +
 309                                 mind + ']' :
 310                           '[' + partial.join(',') + ']';
 311                 gap = mind;
 312                 return v;
 313             }
 314
 315 // If the replacer is an array, use it to select the members to be stringified.
 316
 317             if (rep && typeof rep === 'object') {
 318                 length = rep.length;
 319                 for (i = 0; i < length; i += 1) {
 320                     k = rep[i];
 321                     if (typeof k === 'string') {
 322                         v = str(k, value);
 323                         if (v) {
 324                             partial.push(quote(k) + (gap ? ': ' : ':') + v);
 325                         }
 326                     }
 327                 }
 328             } else {
 329
 330 // Otherwise, iterate through all of the keys in the object.
 331
 332                 for (k in value) {
 333                     if (Object.hasOwnProperty.call(value, k)) {
 334                         v = str(k, value);
 335                         if (v) {
 336                             partial.push(quote(k) + (gap ? ': ' : ':') + v);
 337                         }
 338                     }
 339                 }
 340             }
 341
 342 // Join all of the member texts together, separated with commas,
 343 // and wrap them in braces.
 344
 345             v = partial.length === 0 ? '{}' :
 346                 gap ? '{\n' + gap + partial.join(',\n' + gap) + '\n' +
 347                         mind + '}' : '{' + partial.join(',') + '}';
 348             gap = mind;
 349             return v;
 350         }
 351     }
 352
 353 // If the JSON object does not yet have a stringify method, give it one.
 354
 355     if (typeof JSON.stringify !== 'function') {
 356         JSON.stringify = function (value, replacer, space) {
 357
 358 // The stringify method takes a value and an optional replacer, and an optional
 359 // space parameter, and returns a JSON text. The replacer can be a function
 360 // that can replace values, or an array of strings that will select the keys.
 361 // A default replacer method can be provided. Use of the space parameter can
 362 // produce text that is more easily readable.
 363
 364             var i;
 365             gap = '';
 366             indent = '';
 367
 368 // If the space parameter is a number, make an indent string containing that
 369 // many spaces.
 370
 371             if (typeof space === 'number') {
 372                 for (i = 0; i < space; i += 1) {
 373                     indent += ' ';
 374                 }
 375
 376 // If the space parameter is a string, it will be used as the indent string.
 377
 378             } else if (typeof space === 'string') {
 379                 indent = space;
 380             }
 381
 382 // If there is a replacer, it must be a function or an array.
 383 // Otherwise, throw an error.
 384
 385             rep = replacer;
 386             if (replacer && typeof replacer !== 'function' &&
 387                     (typeof replacer !== 'object' ||
 388                      typeof replacer.length !== 'number')) {
 389                 throw new Error('JSON.stringify');
 390             }
 391
 392 // Make a fake root object containing our value under the key of ''.
 393 // Return the result of stringifying the value.
 394
 395             return str('', {'': value});
 396         };
 397     }
 398
 399
 400 // If the JSON object does not yet have a parse method, give it one.
 401
 402     if (typeof JSON.parse !== 'function') {
 403         JSON.parse = function (text, reviver) {
 404
 405 // The parse method takes a text and an optional reviver function, and returns
 406 // a JavaScript value if the text is a valid JSON text.
 407
 408             var j;
 409
 410             function walk(holder, key) {
 411
 412 // The walk method is used to recursively walk the resulting structure so
 413 // that modifications can be made.
 414
 415                 var k, v, value = holder[key];
 416                 if (value && typeof value === 'object') {
 417                     for (k in value) {
 418                         if (Object.hasOwnProperty.call(value, k)) {
 419                             v = walk(value, k);
 420                             if (v !== undefined) {
 421                                 value[k] = v;
 422                             } else {
 423                                 delete value[k];
 424                             }
 425                         }
 426                     }
 427                 }
 428                 return reviver.call(holder, key, value);
 429             }
 430
 431
 432 // Parsing happens in four stages. In the first stage, we replace certain
 433 // Unicode characters with escape sequences. JavaScript handles many characters
 434 // incorrectly, either silently deleting them, or treating them as line endings.
 435
 436             text = String(text);
 437             cx.lastIndex = 0;
 438             if (cx.test(text)) {
 439                 text = text.replace(cx, function (a) {
 440                     return '\\u' +
 441                         ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
 442                 });
 443             }
 444
 445 // In the second stage, we run the text against regular expressions that look
 446 // for non-JSON patterns. We are especially concerned with '()' and 'new'
 447 // because they can cause invocation, and '=' because it can cause mutation.
 448 // But just to be safe, we want to reject all unexpected forms.
 449
 450 // We split the second stage into 4 regexp operations in order to work around
 451 // crippling inefficiencies in IE's and Safari's regexp engines. First we
 452 // replace the JSON backslash pairs with '@' (a non-JSON character). Second, we
 453 // replace all simple value tokens with ']' characters. Third, we delete all
 454 // open brackets that follow a colon or comma or that begin the text. Finally,
 455 // we look to see that the remaining characters are only whitespace or ']' or
 456 // ',' or ':' or '{' or '}'. If that is so, then the text is safe for eval.
 457
 458             if (/^[\],:{}\s]*$/.
 459 test(text.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, '@').
 460 replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']').
 461 replace(/(?:^|:|,)(?:\s*\[)+/g, ''))) {
 462
 463 // In the third stage we use the eval function to compile the text into a
 464 // JavaScript structure. The '{' operator is subject to a syntactic ambiguity
 465 // in JavaScript: it can begin a block or an object literal. We wrap the text
 466 // in parens to eliminate the ambiguity.
 467
 468                 j = eval('(' + text + ')');
 469
 470 // In the optional fourth stage, we recursively walk the new structure, passing
 471 // each name/value pair to a reviver function for possible transformation.
 472
 473                 return typeof reviver === 'function' ?
 474                     walk({'': j}, '') : j;
 475             }
 476
 477 // If the text is not JSON parseable, then a SyntaxError is thrown.
 478
 479             throw new SyntaxError('JSON.parse');
 480         };
 481     }
 482 }());