1/* 2http://www.JSON.org/json2.js 32011-02-23 4 5Public Domain. 6 7NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK. 8 9See http://www.JSON.org/js.html 10 11 12This code should be minified before deployment. 13See http://javascript.crockford.com/jsmin.html 14 15USE YOUR OWN COPY. IT IS EXTREMELY UNWISE TO LOAD CODE FROM SERVERS YOU DO 16NOT CONTROL. 17 18 19This file creates a global JSON object containing two methods: stringify 20and parse. 21 22JSON.stringify(value, replacer, space) 23value any JavaScript value, usually an object or array. 24 25replacer an optional parameter that determines how object 26values are stringified for objects. It can be a 27function or an array of strings. 28 29space an optional parameter that specifies the indentation 30of nested structures. If it is omitted, the text will 31be packed without extra whitespace. If it is a number, 32it will specify the number of spaces to indent at each 33level. If it is a string (such as '\t' or ' '), 34it contains the characters used to indent at each level. 35 36This method produces a JSON text from a JavaScript value. 37 38When an object value is found, if the object contains a toJSON 39method, its toJSON method will be called and the result will be 40stringified. A toJSON method does not serialize: it returns the 41value represented by the name/value pair that should be serialized, 42or undefined if nothing should be serialized. The toJSON method 43will be passed the key associated with the value, and this will be 44bound to the value 45 46For example, this would serialize Dates as ISO strings. 47 48Date.prototype.toJSON = function (key) { 49function f(n) { 50// Format integers to have at least two digits. 51return n < 10 ? '0' + n : n; 52} 53 54return this.getUTCFullYear() + '-' + 55f(this.getUTCMonth() + 1) + '-' + 56f(this.getUTCDate()) + 'T' + 57f(this.getUTCHours()) + ':' + 58f(this.getUTCMinutes()) + ':' + 59f(this.getUTCSeconds()) + 'Z'; 60}; 61 62You can provide an optional replacer method. It will be passed the 63key and value of each member, with this bound to the containing 64object. The value that is returned from your method will be 65serialized. If your method returns undefined, then the member will 66be excluded from the serialization. 67 68If the replacer parameter is an array of strings, then it will be 69used to select the members to be serialized. It filters the results 70such that only members with keys listed in the replacer array are 71stringified. 72 73Values that do not have JSON representations, such as undefined or 74functions, will not be serialized. Such values in objects will be 75dropped; in arrays they will be replaced with null. You can use 76a replacer function to replace those with JSON values. 77JSON.stringify(undefined) returns undefined. 78 79The optional space parameter produces a stringification of the 80value that is filled with line breaks and indentation to make it 81easier to read. 82 83If the space parameter is a non-empty string, then that string will 84be used for indentation. If the space parameter is a number, then 85the indentation will be that many spaces. 86 87Example: 88 89text = JSON.stringify(['e', {pluribus: 'unum'}]); 90// text is '["e",{"pluribus":"unum"}]' 91 92 93text = JSON.stringify(['e', {pluribus: 'unum'}], null, '\t'); 94// text is '[\n\t"e",\n\t{\n\t\t"pluribus": "unum"\n\t}\n]' 95 96text = JSON.stringify([new Date()], function (key, value) { 97return this[key] instanceof Date ? 98'Date(' + this[key] + ')' : value; 99}); 100// text is '["Date(---current time---)"]' 101 102 103JSON.parse(text, reviver) 104This method parses a JSON text to produce an object or array. 105It can throw a SyntaxError exception. 106 107The optional reviver parameter is a function that can filter and 108transform the results. It receives each of the keys and values, 109and its return value is used instead of the original value. 110If it returns what it received, then the structure is not modified. 111If it returns undefined then the member is deleted. 112 113Example: 114 115// Parse the text. Values that look like ISO date strings will 116// be converted to Date objects. 117 118myData = JSON.parse(text, function (key, value) { 119var a; 120if (typeof value === 'string') { 121a = 122/^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2}(?:\.\d*)?)Z$/.exec(value); 123if (a) { 124return new Date(Date.UTC(+a[1], +a[2] - 1, +a[3], +a[4], 125+a[5], +a[6])); 126} 127} 128return value; 129}); 130 131myData = JSON.parse('["Date(09/09/2001)"]', function (key, value) { 132var d; 133if (typeof value === 'string' && 134value.slice(0, 5) === 'Date(' && 135value.slice(-1) === ')') { 136d = new Date(value.slice(5, -1)); 137if (d) { 138return d; 139} 140} 141return value; 142}); 143 144 145This is a reference implementation. You are free to copy, modify, or 146redistribute. 147*/ 148 149/*jslint evil: true, strict: false, regexp: false */ 150 151/*members "", "\b", "\t", "\n", "\f", "\r", "\"", JSON, "\\", apply, 152call, charCodeAt, getUTCDate, getUTCFullYear, getUTCHours, 153getUTCMinutes, getUTCMonth, getUTCSeconds, hasOwnProperty, join, 154lastIndex, length, parse, prototype, push, replace, slice, stringify, 155test, 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 162var JSON; 163if (!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
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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} ());
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