1/* 2 json.js 3 2014-02-04 4 5 Public Domain 6 7 No warranty expressed or implied. Use at your own risk. 8 9 This file has been superceded by http://www.JSON.org/json2.js 10 11 See http://www.JSON.org/js.html 12 13 This code should be minified before deployment. 14 See http://javascript.crockford.com/jsmin.html 15 16 USE YOUR OWN COPY. IT IS EXTREMELY UNWISE TO LOAD CODE FROM SERVERS YOU DO 17 NOT CONTROL. 18 19 This file adds these methods to JavaScript: 20 21 object.toJSONString(whitelist) 22 This method produce a JSON text from a JavaScript value. 23 It must not contain any cyclical references. Illegal values 24 will be excluded. 25 26 The default conversion for dates is to an ISO string. You can 27 add a toJSONString method to any date object to get a different 28 representation. 29 30 The object and array methods can take an optional whitelist 31 argument. A whitelist is an array of strings. If it is provided, 32 keys in objects not found in the whitelist are excluded. 33 34 string.parseJSON(filter) 35 This method parses a JSON text to produce an object or 36 array. It can throw a SyntaxError exception. 37 38 The optional filter parameter is a function which can filter and 39 transform the results. It receives each of the keys and values, and 40 its return value is used instead of the original value. If it 41 returns what it received, then structure is not modified. If it 42 returns undefined then the member is deleted. 43 44 Example: 45 46 // Parse the text. If a key contains the string 'date' then 47 // convert the value to a date. 48 49 myData = text.parseJSON(function (key, value) { 50 return key.indexOf('date') >= 0 ? new Date(value) : value; 51 }); 52 53 This file will break programs with improper for..in loops. See 54 http://yuiblog.com/blog/2006/09/26/for-in-intrigue/ 55 56 This file creates a global JSON object containing two methods: stringify 57 and parse. 58 59 JSON.stringify(value, replacer, space) 60 value any JavaScript value, usually an object or array. 61 62 replacer an optional parameter that determines how object 63 values are stringified for objects. It can be a 64 function or an array of strings. 65 66 space an optional parameter that specifies the indentation 67 of nested structures. If it is omitted, the text will 68 be packed without extra whitespace. If it is a number, 69 it will specify the number of spaces to indent at each 70 level. If it is a string (such as '\t' or ' '), 71 it contains the characters used to indent at each level. 72 73 This method produces a JSON text from a JavaScript value. 74 75 When an object value is found, if the object contains a toJSON 76 method, its toJSON method will be called and the result will be 77 stringified. A toJSON method does not serialize: it returns the 78 value represented by the name/value pair that should be serialized, 79 or undefined if nothing should be serialized. The toJSON method 80 will be passed the key associated with the value, and this will be 81 bound to the object holding the key. 82 83 For example, this would serialize Dates as ISO strings. 84 85 Date.prototype.toJSON = function (key) { 86 function f(n) { 87 // Format integers to have at least two digits. 88 return n < 10 ? '0' + n : n; 89 } 90 91 return this.getUTCFullYear() + '-' + 92 f(this.getUTCMonth() + 1) + '-' + 93 f(this.getUTCDate()) + 'T' + 94 f(this.getUTCHours()) + ':' + 95 f(this.getUTCMinutes()) + ':' + 96 f(this.getUTCSeconds()) + 'Z'; 97 }; 98 99 You can provide an optional replacer method. It will be passed the 100 key and value of each member, with this bound to the containing 101 object. The value that is returned from your method will be 102 serialized. If your method returns undefined, then the member will 103 be excluded from the serialization. 104 105 If the replacer parameter is an array of strings, then it will be 106 used to select the members to be serialized. It filters the results 107 such that only members with keys listed in the replacer array are 108 stringified. 109 110 Values that do not have JSON representations, such as undefined or 111 functions, will not be serialized. Such values in objects will be 112 dropped; in arrays they will be replaced with null. You can use 113 a replacer function to replace those with JSON values. 114 JSON.stringify(undefined) returns undefined. 115 116 The optional space parameter produces a stringification of the 117 value that is filled with line breaks and indentation to make it 118 easier to read. 119 120 If the space parameter is a non-empty string, then that string will 121 be used for indentation. If the space parameter is a number, then 122 the indentation will be that many spaces. 123 124 Example: 125 126 text = JSON.stringify(['e', {pluribus: 'unum'}]); 127 // text is '["e",{"pluribus":"unum"}]' 128 129 130 text = JSON.stringify(['e', {pluribus: 'unum'}], null, '\t'); 131 // text is '[\n\t"e",\n\t{\n\t\t"pluribus": "unum"\n\t}\n]' 132 133 text = JSON.stringify([new Date()], function (key, value) { 134 return this[key] instanceof Date ? 135 'Date(' + this[key] + ')' : value; 136 }); 137 // text is '["Date(---current time---)"]' 138 139 140 JSON.parse(text, reviver) 141 This method parses a JSON text to produce an object or array. 142 It can throw a SyntaxError exception. 143 144 The optional reviver parameter is a function that can filter and 145 transform the results. It receives each of the keys and values, 146 and its return value is used instead of the original value. 147 If it returns what it received, then the structure is not modified. 148 If it returns undefined then the member is deleted. 149 150 Example: 151 152 // Parse the text. Values that look like ISO date strings will 153 // be converted to Date objects. 154 155 myData = JSON.parse(text, function (key, value) { 156 var a; 157 if (typeof value === 'string') { 158 a = 159 /^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2}(?:\.\d*)?)Z$/.exec(value); 160 if (a) { 161 return new Date(Date.UTC(+a[1], +a[2] - 1, +a[3], +a[4], 162 +a[5], +a[6])); 163 } 164 } 165 return value; 166 }); 167 168 myData = JSON.parse('["Date(09/09/2001)"]', function (key, value) { 169 var d; 170 if (typeof value === 'string' && 171 value.slice(0, 5) === 'Date(' && 172 value.slice(-1) === ')') { 173 d = new Date(value.slice(5, -1)); 174 if (d) { 175 return d; 176 } 177 } 178 return value; 179 }); 180 181 182 This is a reference implementation. You are free to copy, modify, or 183 redistribute. 184 */ 185 186/*jslint evil: true, regexp: true, unparam: true */ 187 188/*members "", "\b", "\t", "\n", "\f", "\r", "\"", JSON, "\\", apply, 189 call, charCodeAt, getUTCDate, getUTCFullYear, getUTCHours, 190 getUTCMinutes, getUTCMonth, getUTCSeconds, hasOwnProperty, join, 191 lastIndex, length, parse, parseJSON, prototype, push, replace, slice, 192 stringify, test, toJSON, toJSONString, toString, valueOf 193 */ 194 195 196// Create a JSON object only if one does not already exist. We create the 197// methods in a closure to avoid creating global variables. 198 199if (typeof tC.JSON !== 'object') { 200 tC.JSON = {}; 201} 202 203(function () { 204 'use strict'; 205 206 function f(n) { 207 // Format integers to have at least two digits. 208 return n < 10 ? '0' + n : n; 209 } 210 211 if (typeof Date.prototype.toJSON !== 'function') { 212 213 Date.prototype.toJSON = function (key) { 214 215 return isFinite(this.valueOf()) 216 ? this.getUTCFullYear() + '-' + 217 f(this.getUTCMonth() + 1) + '-' + 218 f(this.getUTCDate()) + 'T' + 219 f(this.getUTCHours()) + ':' + 220 f(this.getUTCMinutes()) + ':' + 221 f(this.getUTCSeconds()) + 'Z' 222 : null; 223 }; 224 225 String.prototype.toJSON = 226 Number.prototype.toJSON = 227 Boolean.prototype.toJSON = function (key) { 228 return this.valueOf(); 229 }; 230 } 231 232 var cx, 233 escapable, 234 gap, 235 indent, 236 meta, 237 rep; 238 239 240 function quote(string) { 241
242// If the string contains no control characters, no quote characters, and no 243// backslash characters, then we can safely slap some quotes around it. 244// Otherwise we must also replace the offending characters with safe escape 245// sequences. 246 247 escapable.lastIndex = 0; 248 return escapable.test(string) ? '"' + string.replace(escapable, function (a) { 249 var c = meta[a]; 250 return typeof c === 'string' 251 ? c 252 : '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4); 253 }) + '"' : '"' + string + '"'; 254 } 255 256 257 function str(key, holder) { 258 259// Produce a string from holder[key]. 260 261 var i, // The loop counter. 262 k, // The member key. 263 v, // The member value. 264 length, 265 mind = gap, 266 partial, 267 value = holder[key]; 268 269// If the value has a toJSON method, call it to obtain a replacement value. 270 271 if (value && typeof value === 'object' && 272 typeof value.toJSON === 'function') { 273 value = value.toJSON(key); 274 } 275 276// If we were called with a replacer function, then call the replacer to 277// obtain a replacement value. 278 279 if (typeof rep === 'function') { 280 value = rep.call(holder, key, value); 281 } 282 283// What happens next depends on the value's type. 284 285 switch (typeof value) { 286 case 'string': 287 return quote(value); 288 289 case 'number': 290 291// JSON numbers must be finite. Encode non-finite numbers as null. 292 293 return isFinite(value) ? String(value) : 'null'; 294 295 case 'boolean': 296 case 'null': 297 298// If the value is a boolean or null, convert it to a string. Note: 299// typeof null does not produce 'null'. The case is included here in 300// the remote chance that this gets fixed someday. 301 302 return String(value); 303 304// If the type is 'object', we might be dealing with an object or an array or 305// null. 306 307 case 'object': 308 309// Due to a specification blunder in ECMAScript, typeof null is 'object', 310// so watch out for that case. 311 312 if (!value) { 313 return 'null'; 314 } 315 316// Make an array to hold the partial results of stringifying this object value. 317 318 gap += indent; 319 partial = []; 320 321// Is the value an array? 322 323 if (Object.prototype.toString.apply(value) === '[object Array]') { 324 325// The value is an array. Stringify every element. Use null as a placeholder 326// for non-JSON values. 327 328 length = value.length; 329 for (i = 0; i < length; i += 1) { 330 partial[i] = str(i, value) || 'null'; 331 } 332 333// Join all of the elements together, separated with commas, and wrap them in 334// brackets. 335 336 v = partial.length === 0 337 ? '[]' 338 : gap 339 ? '[\n' + gap + partial.join(',\n' + gap) + '\n' + mind + ']' 340 : '[' + partial.join(',') + ']'; 341 gap = mind; 342 return v; 343 } 344 345// If the replacer is an array, use it to select the members to be stringified. 346 347 if (rep && typeof rep === 'object') { 348 length = rep.length; 349 for (i = 0; i < length; i += 1) { 350 k = rep[i]; 351 if (typeof k === 'string') { 352 v = str(k, value); 353 if (v) { 354 partial.push(quote(k) + (gap ? ': ' : ':') + v); 355 } 356 } 357 } 358 } else { 359 360// Otherwise, iterate through all of the keys in the object. 361 362 for (k in value) { 363 if (Object.prototype.hasOwnProperty.call(value, k)) { 364 v = str(k, value); 365 if (v) { 366 partial.push(quote(k) + (gap ? ': ' : ':') + v); 367 } 368 } 369 } 370 } 371 372// Join all of the member texts together, separated with commas, 373// and wrap them in braces. 374 375 v = partial.length === 0 ? '{}' 376 : gap 377 ? '{\n' + gap + partial.join(',\n' + gap) + '\n' + mind + '}' 378 : '{' + partial.join(',') + '}'; 379 gap = mind; 380 return v; 381 } 382 } 383 384// If the JSON object does not yet have a stringify method, give it one. 385 386 if (typeof tC.JSON.stringify !== 'function') { 387 escapable = /[\\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g; 388 meta = { // table of character substitutions 389 '\b': '\\b', 390 '\t': '\\t', 391 '\n': '\\n', 392 '\f': '\\f', 393 '\r': '\\r', 394 '"' : '\\"', 395 '\\': '\\\\' 396 }; 397 tC.JSON.stringify = function (value, replacer, space) { 398 399// The stringify method takes a value and an optional replacer, and an optional 400// space parameter, and returns a JSON text. The replacer can be a function
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401// that can replace values, or an array of strings that will select the keys. 402// A default replacer method can be provided. Use of the space parameter can 403// produce text that is more easily readable. 404 405 var i; 406 gap = ''; 407 indent = ''; 408 409// If the space parameter is a number, make an indent string containing that 410// many spaces. 411 412 if (typeof space === 'number') { 413 for (i = 0; i < space; i += 1) { 414 indent += ' '; 415 } 416 417// If the space parameter is a string, it will be used as the indent string. 418 419 } else if (typeof space === 'string') { 420 indent = space; 421 } 422 423// If there is a replacer, it must be a function or an array. 424// Otherwise, throw an error. 425 426 rep = replacer; 427 if (replacer && typeof replacer !== 'function' && 428 (typeof replacer !== 'object' || 429 typeof replacer.length !== 'number')) { 430 throw new Error('tC.JSON.stringify'); 431 } 432 433// Make a fake root object containing our value under the key of ''. 434// Return the result of stringifying the value. 435 436 return str('', {'': value}); 437 }; 438 } 439 440 441// If the JSON object does not yet have a parse method, give it one. 442 443 if (typeof tC.JSON.parse !== 'function') { 444 cx = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g; 445 tC.JSON.parse = function (text, reviver) { 446 447// The parse method takes a text and an optional reviver function, and returns 448// a JavaScript value if the text is a valid JSON text. 449 450 var j; 451 452 function walk(holder, key) { 453 454// The walk method is used to recursively walk the resulting structure so 455// that modifications can be made. 456 457 var k, v, value = holder[key]; 458 if (value && typeof value === 'object') { 459 for (k in value) { 460 if (Object.prototype.hasOwnProperty.call(value, k)) { 461 v = walk(value, k); 462 if (v !== undefined) { 463 value[k] = v; 464 } else { 465 delete value[k]; 466 } 467 } 468 } 469 } 470 return reviver.call(holder, key, value); 471 } 472 473 474// Parsing happens in four stages. In the first stage, we replace certain 475// Unicode characters with escape sequences. JavaScript handles many characters 476// incorrectly, either silently deleting them, or treating them as line endings. 477 478 text = String(text); 479 cx.lastIndex = 0; 480 if (cx.test(text)) { 481 text = text.replace(cx, function (a) { 482 return '\\u' + 483 ('0000' + a.charCodeAt(0).toString(16)).slice(-4); 484 }); 485 } 486 487// In the second stage, we run the text against regular expressions that look 488// for non-JSON patterns. We are especially concerned with '()' and 'new' 489// because they can cause invocation, and '=' because it can cause mutation. 490// But just to be safe, we want to reject all unexpected forms. 491 492// We split the second stage into 4 regexp operations in order to work around 493// crippling inefficiencies in IE's and Safari's regexp engines. First we 494// replace the JSON backslash pairs with '@' (a non-JSON character). Second, we 495// replace all simple value tokens with ']' characters. Third, we delete all 496// open brackets that follow a colon or comma or that begin the text. Finally, 497// we look to see that the remaining characters are only whitespace or ']' or 498// ',' or ':' or '{' or '}'. If that is so, then the text is safe for eval. 499 500 if (/^[\],:{}\s]*$/ 501 .test(text.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, '@') 502 .replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']') 503 .replace(/(?:^|:|,)(?:\s*\[)+/g, ''))) { 504 505// In the third stage we use the eval function to compile the text into a 506// JavaScript structure. The '{' operator is subject to a syntactic ambiguity 507// in JavaScript: it can begin a block or an object literal. We wrap the text 508// in parens to eliminate the ambiguity. 509
510 j = eval('(' + text + ')'); 511 512// In the optional fourth stage, we recursively walk the new structure, passing 513// each name/value pair to a reviver function for possible transformation. 514 515 return typeof reviver === 'function' 516 ? walk({'': j}, '') 517 : j; 518 } 519 520// If the text is not JSON parseable, then a SyntaxError is thrown. 521 522 throw new SyntaxError('tC.JSON.parse'); 523 }; 524 } 525 526// Augment the basic prototypes if they have not already been augmented. 527// These forms are obsolete. It is recommended that tC.JSON.stringify and 528// JSON.parse be used instead. 529 530 if (!Object.prototype.toJSONString) { 531 Object.prototype.toJSONString = function (filter) { 532 return tC.JSON.stringify(this, filter); 533 }; 534 Object.prototype.parseJSON = function (filter) { 535 return tC.JSON.parse(this, filter); 536 }; 537 } 538}());
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