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 }());