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   1  /*
   2      http://www.JSON.org/json2.js
   3      2009-08-17
   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. It can be a
  19                          function or an array of strings.
  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 value
  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 of strings, then it will be
  61              used to select the members to be serialized. It filters the results
  62              such 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  /*members "", "\b", "\t", "\n", "\f", "\r", "\"", JSON, "\\", apply,
 150      call, charCodeAt, getUTCDate, getUTCFullYear, getUTCHours,
 151      getUTCMinutes, getUTCMonth, getUTCSeconds, hasOwnProperty, join,
 152      lastIndex, length, parse, prototype, push, replace, slice, stringify,
 153      test, toJSON, toString, valueOf
 154  */
 155  
 156  "use strict";
 157  
 158  // Create a JSON object only if one does not already exist. We create the
 159  // methods in a closure to avoid creating global variables.
 160  
 161  if (!this.JSON) {
 162      this.JSON = {};
 163  }
 164  
 165  (function () {
 166  
 167      function f(n) {
 168          // Format integers to have at least two digits.
 169          return n < 10 ? '0' + n : n;
 170      }
 171  
 172      if (typeof Date.prototype.toJSON !== 'function') {
 173  
 174          Date.prototype.toJSON = function (key) {
 175  
 176              return isFinite(this.valueOf()) ?
 177                     this.getUTCFullYear()   + '-' +
 178                   f(this.getUTCMonth() + 1) + '-' +
 179                   f(this.getUTCDate())      + 'T' +
 180                   f(this.getUTCHours())     + ':' +
 181                   f(this.getUTCMinutes())   + ':' +
 182                   f(this.getUTCSeconds())   + 'Z' : null;
 183          };
 184  
 185          String.prototype.toJSON =
 186          Number.prototype.toJSON =
 187          Boolean.prototype.toJSON = function (key) {
 188              return this.valueOf();
 189          };
 190      }
 191  
 192      var cx = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
 193          escapable = /[\\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
 194          gap,
 195          indent,
 196          meta = {    // table of character substitutions
 197              '\b': '\\b',
 198              '\t': '\\t',
 199              '\n': '\\n',
 200              '\f': '\\f',
 201              '\r': '\\r',
 202              '"' : '\\"',
 203              '\\': '\\\\'
 204          },
 205          rep;
 206  
 207  
 208      function quote(string) {
 209  
 210  // If the string contains no control characters, no quote characters, and no
 211  // backslash characters, then we can safely slap some quotes around it.
 212  // Otherwise we must also replace the offending characters with safe escape
 213  // sequences.
 214  
 215          escapable.lastIndex = 0;
 216          return escapable.test(string) ?
 217              '"' + string.replace(escapable, function (a) {
 218                  var c = meta[a];
 219                  return typeof c === 'string' ? c :
 220                      '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
 221              }) + '"' :
 222              '"' + string + '"';
 223      }
 224  
 225  
 226      function str(key, holder) {
 227  
 228  // Produce a string from holder[key].
 229  
 230          var i,          // The loop counter.
 231              k,          // The member key.
 232              v,          // The member value.
 233              length,
 234              mind = gap,
 235              partial,
 236              value = holder[key];
 237  
 238  // If the value has a toJSON method, call it to obtain a replacement value.
 239  
 240          if (value && typeof value === 'object' &&
 241                  typeof value.toJSON === 'function') {
 242              value = value.toJSON(key);
 243          }
 244  
 245  // If we were called with a replacer function, then call the replacer to
 246  // obtain a replacement value.
 247  
 248          if (typeof rep === 'function') {
 249              value = rep.call(holder, key, value);
 250          }
 251  
 252  // What happens next depends on the value's type.
 253  
 254          switch (typeof value) {
 255          case 'string':
 256              return quote(value);
 257  
 258          case 'number':
 259  
 260  // JSON numbers must be finite. Encode non-finite numbers as null.
 261  
 262              return isFinite(value) ? String(value) : 'null';
 263  
 264          case 'boolean':
 265          case 'null':
 266  
 267  // If the value is a boolean or null, convert it to a string. Note:
 268  // typeof null does not produce 'null'. The case is included here in
 269  // the remote chance that this gets fixed someday.
 270  
 271              return String(value);
 272  
 273  // If the type is 'object', we might be dealing with an object or an array or
 274  // null.
 275  
 276          case 'object':
 277  
 278  // Due to a specification blunder in ECMAScript, typeof null is 'object',
 279  // so watch out for that case.
 280  
 281              if (!value) {
 282                  return 'null';
 283              }
 284  
 285  // Make an array to hold the partial results of stringifying this object value.
 286  
 287              gap += indent;
 288              partial = [];
 289  
 290  // Is the value an array?
 291  
 292              if (Object.prototype.toString.apply(value) === '[object Array]') {
 293  
 294  // The value is an array. Stringify every element. Use null as a placeholder
 295  // for non-JSON values.
 296  
 297                  length = value.length;
 298                  for (i = 0; i < length; i += 1) {
 299                      partial[i] = str(i, value) || 'null';
 300                  }
 301  
 302  // Join all of the elements together, separated with commas, and wrap them in
 303  // brackets.
 304  
 305                  v = partial.length === 0 ? '[]' :
 306                      gap ? '[\n' + gap +
 307                              partial.join(',\n' + gap) + '\n' +
 308                                  mind + ']' :
 309                            '[' + partial.join(',') + ']';
 310                  gap = mind;
 311                  return v;
 312              }
 313  
 314  // If the replacer is an array, use it to select the members to be stringified.
 315  
 316              if (rep && typeof rep === 'object') {
 317                  length = rep.length;
 318                  for (i = 0; i < length; i += 1) {
 319                      k = rep[i];
 320                      if (typeof k === 'string') {
 321                          v = str(k, value);
 322                          if (v) {
 323                              partial.push(quote(k) + (gap ? ': ' : ':') + v);
 324                          }
 325                      }
 326                  }
 327              } else {
 328  
 329  // Otherwise, iterate through all of the keys in the object.
 330  
 331                  for (k in value) {
 332                      if (Object.hasOwnProperty.call(value, k)) {
 333                          v = str(k, value);
 334                          if (v) {
 335                              partial.push(quote(k) + (gap ? ': ' : ':') + v);
 336                          }
 337                      }
 338                  }
 339              }
 340  
 341  // Join all of the member texts together, separated with commas,
 342  // and wrap them in braces.
 343  
 344              v = partial.length === 0 ? '{}' :
 345                  gap ? '{\n' + gap + partial.join(',\n' + gap) + '\n' +
 346                          mind + '}' : '{' + partial.join(',') + '}';
 347              gap = mind;
 348              return v;
 349          }
 350      }
 351  
 352  // If the JSON object does not yet have a stringify method, give it one.
 353  
 354      if (typeof JSON.stringify !== 'function') {
 355          JSON.stringify = function (value, replacer, space) {
 356  
 357  // The stringify method takes a value and an optional replacer, and an optional
 358  // space parameter, and returns a JSON text. The replacer can be a function
 359  // that can replace values, or an array of strings that will select the keys.
 360  // A default replacer method can be provided. Use of the space parameter can
 361  // produce text that is more easily readable.
 362  
 363              var i;
 364              gap = '';
 365              indent = '';
 366  
 367  // If the space parameter is a number, make an indent string containing that
 368  // many spaces.
 369  
 370              if (typeof space === 'number') {
 371                  for (i = 0; i < space; i += 1) {
 372                      indent += ' ';
 373                  }
 374  
 375  // If the space parameter is a string, it will be used as the indent string.
 376  
 377              } else if (typeof space === 'string') {
 378                  indent = space;
 379              }
 380  
 381  // If there is a replacer, it must be a function or an array.
 382  // Otherwise, throw an error.
 383  
 384              rep = replacer;
 385              if (replacer && typeof replacer !== 'function' &&
 386                      (typeof replacer !== 'object' ||
 387                       typeof replacer.length !== 'number')) {
 388                  throw new Error('JSON.stringify');
 389              }
 390  
 391  // Make a fake root object containing our value under the key of ''.
 392  // Return the result of stringifying the value.
 393  
 394              return str('', {'': value});
 395          };
 396      }
 397  
 398  
 399  // If the JSON object does not yet have a parse method, give it one.
 400  
 401      if (typeof JSON.parse !== 'function') {
 402          JSON.parse = function (text, reviver) {
 403  
 404  // The parse method takes a text and an optional reviver function, and returns
 405  // a JavaScript value if the text is a valid JSON text.
 406  
 407              var j;
 408  
 409              function walk(holder, key) {
 410  
 411  // The walk method is used to recursively walk the resulting structure so
 412  // that modifications can be made.
 413  
 414                  var k, v, value = holder[key];
 415                  if (value && typeof value === 'object') {
 416                      for (k in value) {
 417                          if (Object.hasOwnProperty.call(value, k)) {
 418                              v = walk(value, k);
 419                              if (v !== undefined) {
 420                                  value[k] = v;
 421                              } else {
 422                                  delete value[k];
 423                              }
 424                          }
 425                      }
 426                  }
 427                  return reviver.call(holder, key, value);
 428              }
 429  
 430  
 431  // Parsing happens in four stages. In the first stage, we replace certain
 432  // Unicode characters with escape sequences. JavaScript handles many characters
 433  // incorrectly, either silently deleting them, or treating them as line endings.
 434  
 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  }());
 481