1 /* 2 http://www.JSON.org/json2.js 3 2008-11-19 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 object holding the key. 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 /*global JSON */ 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 // 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 /** 163 * @namespace JSON namespace 164 * @author <a href="http://www.crockford.com/">Douglas Crockford</a> 165 * @see <a href="http://www.json.org/">http://www.json.org/</a> 166 */ 167 JSON = {}; 168 } 169 (function () { 170 171 function f(n) { 172 // Format integers to have at least two digits. 173 return n < 10 ? '0' + n : n; 174 } 175 176 if (typeof Date.prototype.toJSON !== 'function') { 177 178 Date.prototype.toJSON = function (key) { 179 180 return 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'; 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) ? 220 '"' + string.replace(escapable, function (a) { 221 var c = meta[a]; 222 return typeof c === 'string' ? c : 223 '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4); 224 }) + '"' : 225 '"' + string + '"'; 226 } 227 228 229 function str(key, holder) { 230 231 // Produce a string from holder[key]. 232 233 var i, // The loop counter. 234 k, // The member key. 235 v, // The member value. 236 length, 237 mind = gap, 238 partial, 239 value = holder[key]; 240 241 // If the value has a toJSON method, call it to obtain a replacement value. 242 243 if (value && typeof value === 'object' && 244 typeof value.toJSON === 'function') { 245 value = value.toJSON(key); 246 } 247 248 // If we were called with a replacer function, then call the replacer to 249 // obtain a replacement value. 250 251 if (typeof rep === 'function') { 252 value = rep.call(holder, key, value); 253 } 254 255 // What happens next depends on the value's type. 256 257 switch (typeof value) { 258 case 'string': 259 return quote(value); 260 261 case 'number': 262 263 // JSON numbers must be finite. Encode non-finite numbers as null. 264 265 return isFinite(value) ? String(value) : 'null'; 266 267 case 'boolean': 268 case 'null': 269 270 // If the value is a boolean or null, convert it to a string. Note: 271 // typeof null does not produce 'null'. The case is included here in 272 // the remote chance that this gets fixed someday. 273 274 return String(value); 275 276 // If the type is 'object', we might be dealing with an object or an array or 277 // null. 278 279 case 'object': 280 281 // Due to a specification blunder in ECMAScript, typeof null is 'object', 282 // so watch out for that case. 283 284 if (!value) { 285 return 'null'; 286 } 287 288 // Make an array to hold the partial results of stringifying this object value. 289 290 gap += indent; 291 partial = []; 292 293 // Is the value an array? 294 295 if (Object.prototype.toString.apply(value) === '[object Array]') { 296 297 // The value is an array. Stringify every element. Use null as a placeholder 298 // for non-JSON values. 299 300 length = value.length; 301 for (i = 0; i < length; i += 1) { 302 partial[i] = str(i, value) || 'null'; 303 } 304 305 // Join all of the elements together, separated with commas, and wrap them in 306 // brackets. 307 308 v = partial.length === 0 ? '[]' : 309 gap ? '[\n' + gap + 310 partial.join(',\n' + gap) + '\n' + 311 mind + ']' : 312 '[' + partial.join(',') + ']'; 313 gap = mind; 314 return v; 315 } 316 317 // If the replacer is an array, use it to select the members to be stringified. 318 319 if (rep && typeof rep === 'object') { 320 length = rep.length; 321 for (i = 0; i < length; i += 1) { 322 k = rep[i]; 323 if (typeof k === 'string') { 324 v = str(k, value); 325 if (v) { 326 partial.push(quote(k) + (gap ? ': ' : ':') + v); 327 } 328 } 329 } 330 } else { 331 332 // Otherwise, iterate through all of the keys in the object. 333 334 for (k in value) { 335 if (Object.hasOwnProperty.call(value, k)) { 336 v = str(k, value); 337 if (v) { 338 partial.push(quote(k) + (gap ? ': ' : ':') + v); 339 } 340 } 341 } 342 } 343 344 // Join all of the member texts together, separated with commas, 345 // and wrap them in braces. 346 347 v = partial.length === 0 ? '{}' : 348 gap ? '{\n' + gap + partial.join(',\n' + gap) + '\n' + 349 mind + '}' : '{' + partial.join(',') + '}'; 350 gap = mind; 351 return v; 352 } 353 } 354 355 // If the JSON object does not yet have a stringify method, give it one. 356 357 if (typeof JSON.stringify !== 'function') { 358 /** 359 * Takes a value and an optional replacer, and an optional space parameter, and returns a JSON text. 360 * @param {Mixed} value the object to be stringified 361 * @param {Function|String[]} [replacer] Function to replace values or an Array to idenfity the properties to keep. 362 * @param {Number|String} [space] Number of space characters or actual String to use for indentation 363 * @returns {String} JSON String 364 * @see 365 */ 366 JSON.stringify = function (value, replacer, space) { 367 368 // The stringify method takes a value and an optional replacer, and an optional 369 // space parameter, and returns a JSON text. The replacer can be a function 370 // that can replace values, or an array of strings that will select the keys. 371 // A default replacer method can be provided. Use of the space parameter can 372 // produce text that is more easily readable. 373 374 var i; 375 gap = ''; 376 indent = ''; 377 378 // If the space parameter is a number, make an indent string containing that 379 // many spaces. 380 381 if (typeof space === 'number') { 382 for (i = 0; i < space; i += 1) { 383 indent += ' '; 384 } 385 386 // If the space parameter is a string, it will be used as the indent string. 387 388 } else if (typeof space === 'string') { 389 indent = space; 390 } 391 392 // If there is a replacer, it must be a function or an array. 393 // Otherwise, throw an error. 394 395 rep = replacer; 396 if (replacer && typeof replacer !== 'function' && 397 (typeof replacer !== 'object' || 398 typeof replacer.length !== 'number')) { 399 throw new Error('JSON.stringify'); 400 } 401 402 // Make a fake root object containing our value under the key of ''. 403 // Return the result of stringifying the value. 404 405 return str('', {'': value}); 406 }; 407 } 408 409 410 // If the JSON object does not yet have a parse method, give it one. 411 412 if (typeof JSON.parse !== 'function') { 413 /** 414 * Takes a text and an optional reviver function, and returns a JavaScript value if the text is a valid JSON text. 415 * @param {String} text the JSON string to parse 416 * @param {Function} [reviver] Function to call on each object of the resulting object to transform values. The Function will be called with three arguments - the propertys' "parent", the property name and the property value 417 * @returns {Object|Array} the resulting Object or Array 418 */ 419 JSON.parse = function (text, reviver) { 420 421 // The parse method takes a text and an optional reviver function, and returns 422 // a JavaScript value if the text is a valid JSON text. 423 424 var j; 425 426 function walk(holder, key) { 427 428 // The walk method is used to recursively walk the resulting structure so 429 // that modifications can be made. 430 431 var k, v, value = holder[key]; 432 if (value && typeof value === 'object') { 433 for (k in value) { 434 if (Object.hasOwnProperty.call(value, k)) { 435 v = walk(value, k); 436 if (v !== undefined) { 437 value[k] = v; 438 } else { 439 delete value[k]; 440 } 441 } 442 } 443 } 444 return reviver.call(holder, key, value); 445 } 446 447 448 // Parsing happens in four stages. In the first stage, we replace certain 449 // Unicode characters with escape sequences. JavaScript handles many characters 450 // incorrectly, either silently deleting them, or treating them as line endings. 451 452 cx.lastIndex = 0; 453 if (cx.test(text)) { 454 text = text.replace(cx, function (a) { 455 return '\\u' + 456 ('0000' + a.charCodeAt(0).toString(16)).slice(-4); 457 }); 458 } 459 460 // In the second stage, we run the text against regular expressions that look 461 // for non-JSON patterns. We are especially concerned with '()' and 'new' 462 // because they can cause invocation, and '=' because it can cause mutation. 463 // But just to be safe, we want to reject all unexpected forms. 464 465 // We split the second stage into 4 regexp operations in order to work around 466 // crippling inefficiencies in IE's and Safari's regexp engines. First we 467 // replace the JSON backslash pairs with '@' (a non-JSON character). Second, we 468 // replace all simple value tokens with ']' characters. Third, we delete all 469 // open brackets that follow a colon or comma or that begin the text. Finally, 470 // we look to see that the remaining characters are only whitespace or ']' or 471 // ',' or ':' or '{' or '}'. If that is so, then the text is safe for eval. 472 473 if (/^[\],:{}\s]*$/. 474 test(text.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, '@'). 475 replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']'). 476 replace(/(?:^|:|,)(?:\s*\[)+/g, ''))) { 477 478 // In the third stage we use the eval function to compile the text into a 479 // JavaScript structure. The '{' operator is subject to a syntactic ambiguity 480 // in JavaScript: it can begin a block or an object literal. We wrap the text 481 // in parens to eliminate the ambiguity. 482 483 j = eval('(' + text + ')'); 484 485 // In the optional fourth stage, we recursively walk the new structure, passing 486 // each name/value pair to a reviver function for possible transformation. 487 488 return typeof reviver === 'function' ? 489 walk({'': j}, '') : j; 490 } 491 492 // If the text is not JSON parseable, then a SyntaxError is thrown. 493 494 throw new SyntaxError('JSON.parse'); 495 }; 496 } 497 })();