1// Copyright 2014 the V8 project authors. All rights reserved. 2// Use of this source code is governed by a BSD-style license that can be 3// found in the LICENSE file. 4 5/* 6 http://www.JSON.org/json2.js 7 2009-04-16 8 9 Public Domain. 10 11 NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK. 12 13 See http://www.JSON.org/js.html 14 15 This file creates a global JSON object containing two methods: stringify 16 and parse. 17 18 JSON.stringify(value, replacer, space) 19 value any JavaScript value, usually an object or array. 20 21 replacer an optional parameter that determines how object 22 values are stringified for objects. It can be a 23 function or an array of strings. 24 25 space an optional parameter that specifies the indentation 26 of nested structures. If it is omitted, the text will 27 be packed without extra whitespace. If it is a number, 28 it will specify the number of spaces to indent at each 29 level. If it is a string (such as '\t' or ' '), 30 it contains the characters used to indent at each level. 31 32 This method produces a JSON text from a JavaScript value. 33 34 When an object value is found, if the object contains a toJSON 35 method, its toJSON method will be called and the result will be 36 stringified. A toJSON method does not serialize: it returns the 37 value represented by the name/value pair that should be serialized, 38 or undefined if nothing should be serialized. The toJSON method 39 will be passed the key associated with the value, and this will be 40 bound to the object holding the key. 41 42 For example, this would serialize Dates as ISO strings. 43 44 Date.prototype.toJSON = function (key) { 45 function f(n) { 46 // Format integers to have at least two digits. 47 return n < 10 ? '0' + n : n; 48 } 49 50 return this.getUTCFullYear() + '-' + 51 f(this.getUTCMonth() + 1) + '-' + 52 f(this.getUTCDate()) + 'T' + 53 f(this.getUTCHours()) + ':' + 54 f(this.getUTCMinutes()) + ':' + 55 f(this.getUTCSeconds()) + 'Z'; 56 }; 57 58 You can provide an optional replacer method. It will be passed the 59 key and value of each member, with this bound to the containing 60 object. The value that is returned from your method will be 61 serialized. If your method returns undefined, then the member will 62 be excluded from the serialization. 63 64 If the replacer parameter is an array of strings, then it will be 65 used to select the members to be serialized. It filters the results 66 such that only members with keys listed in the replacer array are 67 stringified. 68 69 Values that do not have JSON representations, such as undefined or 70 functions, will not be serialized. Such values in objects will be 71 dropped; in arrays they will be replaced with null. You can use 72 a replacer function to replace those with JSON values. 73 JSON.stringify(undefined) returns undefined. 74 75 The optional space parameter produces a stringification of the 76 value that is filled with line breaks and indentation to make it 77 easier to read. 78 79 If the space parameter is a non-empty string, then that string will 80 be used for indentation. If the space parameter is a number, then 81 the indentation will be that many spaces. 82 83 Example: 84 85 text = JSON.stringify(['e', {pluribus: 'unum'}]); 86 // text is '["e",{"pluribus":"unum"}]' 87 88 89 text = JSON.stringify(['e', {pluribus: 'unum'}], null, '\t'); 90 // text is '[\n\t"e",\n\t{\n\t\t"pluribus": "unum"\n\t}\n]' 91 92 text = JSON.stringify([new Date()], function (key, value) { 93 return this[key] instanceof Date ? 94 'Date(' + this[key] + ')' : value; 95 }); 96 // text is '["Date(---current time---)"]' 97 98 99 JSON.parse(text, reviver) 100 This method parses a JSON text to produce an object or array. 101 It can throw a SyntaxError exception. 102 103 The optional reviver parameter is a function that can filter and 104 transform the results. It receives each of the keys and values, 105 and its return value is used instead of the original value. 106 If it returns what it received, then the structure is not modified. 107 If it returns undefined then the member is deleted. 108 109 Example: 110 111 // Parse the text. Values that look like ISO date strings will 112 // be converted to Date objects. 113 114 myData = JSON.parse(text, function (key, value) { 115 var a; 116 if (typeof value === 'string') { 117 a = 118/^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2}(?:\.\d*)?)Z$/.exec(value); 119 if (a) { 120 return new Date(Date.UTC(+a[1], +a[2] - 1, +a[3], +a[4], 121 +a[5], +a[6])); 122 } 123 } 124 return value; 125 }); 126 127 myData = JSON.parse('["Date(09/09/2001)"]', function (key, value) { 128 var d; 129 if (typeof value === 'string' && 130 value.slice(0, 5) === 'Date(' && 131 value.slice(-1) === ')') { 132 d = new Date(value.slice(5, -1)); 133 if (d) { 134 return d; 135 } 136 } 137 return value; 138 }); 139 140 141 This is a reference implementation. You are free to copy, modify, or 142 redistribute. 143 144 This code should be minified before deployment. 145 See http://javascript.crockford.com/jsmin.html 146 147 USE YOUR OWN COPY. IT IS EXTREMELY UNWISE TO LOAD CODE FROM SERVERS YOU DO 148 NOT CONTROL. 149*/ 150 151/*jslint evil: true */ 152 153/*global JSON */ 154 155/*members "", "\b", "\t", "\n", "\f", "\r", "\"", JSON, "\\", apply, 156 call, charCodeAt, getUTCDate, getUTCFullYear, getUTCHours, 157 getUTCMinutes, getUTCMonth, getUTCSeconds, hasOwnProperty, join, 158 lastIndex, length, parse, prototype, push, replace, slice, stringify, 159 test, toJSON, toString, valueOf 160*/ 161 162// Create a JSON object only if one does not already exist. We create the 163// methods in a closure to avoid creating global variables. 164 165if (!this.JSON) { 166 JSON = {}; 167} 168(function () { 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 this.getUTCFullYear() + '-' + 180 f(this.getUTCMonth() + 1) + '-' + 181 f(this.getUTCDate()) + 'T' + 182 f(this.getUTCHours()) + ':' + 183 f(this.getUTCMinutes()) + ':' + 184 f(this.getUTCSeconds()) + 'Z'; 185 }; 186 } 187 188 var cx = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g, 189 escapable = /[\\\"\x00-\x1f]/g, 190 gap, 191 indent, 192 meta = { // table of character substitutions 193 '\b': '\\b', 194 '\t': '\\t', 195 '\n': '\\n', 196 '\f': '\\f', 197 '\r': '\\r', 198 '"' : '\\"', 199 '\\': '\\\\' 200 }, 201 rep; 202 203 204 function quote(string) { 205 206// If the string contains no control characters, no quote characters, and no 207// backslash characters, then we can safely slap some quotes around it. 208// Otherwise we must also replace the offending characters with safe escape 209// sequences. 210 211 escapable.lastIndex = 0; 212 return escapable.test(string) ? 213 '"' + string.replace(escapable, function (a) { 214 var c = meta[a]; 215 return typeof c === 'string' ? c : 216 '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4); 217 }) + '"' : 218 '"' + string + '"'; 219 } 220 221 222 function str(key, holder) { 223 224// Produce a string from holder[key]. 225 226 var i, // The loop counter. 227 k, // The member key. 228 v, // The member value. 229 length, 230 mind = gap, 231 partial, 232 value = holder[key]; 233 234// If the value has a toJSON method, call it to obtain a replacement value. 235 236 if (value && typeof value === 'object' && 237 typeof value.toJSON === 'function') { 238 value = value.toJSON(key); 239 } 240 241// If we were called with a replacer function, then call the replacer to 242// obtain a replacement value. 243 244 if (typeof rep === 'function') { 245 value = rep.call(holder, key, value); 246 } 247 248// What happens next depends on the value's type. 249 250 if (value && ((typeof value) === "object")) { 251 if (value.constructor === String || value.constructor === Number || value.constructor === Boolean) 252 value = value.valueOf(); 253 } 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 ? '[]' : 307 gap ? '[\n' + gap + 308 partial.join(',\n' + gap) + '\n' + 309 mind + ']' : 310 '[' + partial.join(',') + ']'; 311 gap = mind; 312 return v; 313 } 314 315// If the replacer is an array, use it to select the members to be stringified. 316 317 if (rep && typeof rep === 'object') { 318 length = rep.length; 319 for (i = 0; i < length; i += 1) { 320 k = rep[i]; 321 if (typeof k === 'string') { 322 v = str(k, value); 323 if (v) { 324 partial.push(quote(k) + (gap ? ': ' : ':') + v); 325 } 326 } 327 } 328 } else { 329 330// Otherwise, iterate through all of the keys in the object. 331 332 for (k in value) { 333 if (Object.hasOwnProperty.call(value, k)) { 334 v = str(k, value); 335 if (v) { 336 partial.push(quote(k) + (gap ? ': ' : ':') + v); 337 } 338 } 339 } 340 } 341 342// Join all of the member texts together, separated with commas, 343// and wrap them in braces. 344 345 v = partial.length === 0 ? '{}' : 346 gap ? '{\n' + gap + partial.join(',\n' + gap) + '\n' + 347 mind + '}' : '{' + partial.join(',') + '}'; 348 gap = mind; 349 return v; 350 } 351 } 352 353// If the JSON object does not yet have a stringify method, give it one. 354 355 if (typeof JSON.stringify !== 'function') { 356 JSON.stringify = function (value, replacer, space) { 357 358// The stringify method takes a value and an optional replacer, and an optional 359// space parameter, and returns a JSON text. The replacer can be a function 360// that can replace values, or an array of strings that will select the keys. 361// A default replacer method can be provided. Use of the space parameter can 362// produce text that is more easily readable. 363 364 var i; 365 gap = ''; 366 indent = ''; 367 368// If the space parameter is a number, make an indent string containing that 369// many spaces. 370 371 if (typeof space === 'number') { 372 for (i = 0; i < space; i += 1) { 373 indent += ' '; 374 } 375 376// If the space parameter is a string, it will be used as the indent string. 377 378 } else if (typeof space === 'string') { 379 indent = space; 380 } 381 382// If there is a replacer, it must be a function or an array. 383// Otherwise, throw an error. 384 385 rep = replacer; 386 if (replacer && typeof replacer !== 'function' && 387 (typeof replacer !== 'object' || 388 typeof replacer.length !== 'number')) { 389 throw new Error('JSON.stringify'); 390 } 391 392// Make a fake root object containing our value under the key of ''. 393// Return the result of stringifying the value. 394 395 return str('', {'': value}); 396 }; 397 } 398 399 400// If the JSON object does not yet have a parse method, give it one. 401 402 if (typeof JSON.parse !== 'function') { 403 JSON.parse = function (text, reviver) { 404 405// The parse method takes a text and an optional reviver function, and returns 406// a JavaScript value if the text is a valid JSON text. 407 408 var j; 409 410 function walk(holder, key) { 411 412// The walk method is used to recursively walk the resulting structure so 413// that modifications can be made. 414 415 var k, v, value = holder[key]; 416 if (value && typeof value === 'object') { 417 for (k in value) { 418 if (Object.hasOwnProperty.call(value, k)) { 419 v = walk(value, k); 420 if (v !== undefined) { 421 value[k] = v; 422 } else { 423 delete value[k]; 424 } 425 } 426 } 427 } 428 return reviver.call(holder, key, value); 429 } 430 431 432// Parsing happens in four stages. In the first stage, we replace certain 433// Unicode characters with escape sequences. JavaScript handles many characters 434// incorrectly, either silently deleting them, or treating them as line endings. 435 436 cx.lastIndex = 0; 437 if (cx.test(text)) { 438 text = text.replace(cx, function (a) { 439 return '\\u' + 440 ('0000' + a.charCodeAt(0).toString(16)).slice(-4); 441 }); 442 } 443 444// In the second stage, we run the text against regular expressions that look 445// for non-JSON patterns. We are especially concerned with '()' and 'new' 446// because they can cause invocation, and '=' because it can cause mutation. 447// But just to be safe, we want to reject all unexpected forms. 448 449// We split the second stage into 4 regexp operations in order to work around 450// crippling inefficiencies in IE's and Safari's regexp engines. First we 451// replace the JSON backslash pairs with '@' (a non-JSON character). Second, we 452// replace all simple value tokens with ']' characters. Third, we delete all 453// open brackets that follow a colon or comma or that begin the text. Finally, 454// we look to see that the remaining characters are only whitespace or ']' or 455// ',' or ':' or '{' or '}'. If that is so, then the text is safe for eval. 456 457 if (/^[\],:{}\s]*$/. 458test(text.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, '@'). 459replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']'). 460replace(/(?:^|:|,)(?:\s*\[)+/g, ''))) { 461 462// In the third stage we use the eval function to compile the text into a 463// JavaScript structure. The '{' operator is subject to a syntactic ambiguity 464// in JavaScript: it can begin a block or an object literal. We wrap the text 465// in parens to eliminate the ambiguity. 466 467 j = eval('(' + text + ')'); 468 469// In the optional fourth stage, we recursively walk the new structure, passing 470// each name/value pair to a reviver function for possible transformation. 471 472 return typeof reviver === 'function' ? 473 walk({'': j}, '') : j; 474 } 475 476// If the text is not JSON parseable, then a SyntaxError is thrown. 477 478 throw new SyntaxError('JSON.parse'); 479 }; 480 } 481}()); 482