1/* 2 http://www.JSON.org/json2.js 3 2008-07-15 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. 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, then it will be used to 61 select the members to be serialized. It filters the results such 62 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, "\\", call,
152 charCodeAt, getUTCDate, getUTCFullYear, getUTCHours, getUTCMinutes, 153 getUTCMonth, getUTCSeconds, hasOwnProperty, join, lastIndex, length, 154 parse, propertyIsEnumerable, prototype, push, replace, slice, stringify, 155 test, toJSON, toString 156*/ 157 158if (!this.JSON) { 159 160// Create a JSON object only if one does not already exist. We create the 161// object in a closure to avoid creating global variables. 162 163 JSON = function () { 164 165 function f(n) { 166 // Format integers to have at least two digits. 167 return n < 10 ? '0' + n : n; 168 } 169 170 Date.prototype.toJSON = function (key) { 171 172 return this.getUTCFullYear() + '-' + 173 f(this.getUTCMonth() + 1) + '-' + 174 f(this.getUTCDate()) + 'T' + 175 f(this.getUTCHours()) + ':' + 176 f(this.getUTCMinutes()) + ':' + 177 f(this.getUTCSeconds()) + 'Z'; 178 }; 179 180 String.prototype.toJSON = 181 Number.prototype.toJSON = 182 Boolean.prototype.toJSON = function (key) { 183 return this.valueOf(); 184 }; 185 186 var cx = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g, 187 escapeable = /[\\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g, 188 gap, 189 indent, 190 meta = { // table of character substitutions 191 '\b': '\\b', 192 '\t': '\\t', 193 '\n': '\\n', 194 '\f': '\\f', 195 '\r': '\\r', 196 '"' : '\\"', 197 '\\': '\\\\' 198 }, 199 rep; 200 201 202 function quote(string) { 203 204// If the string contains no control characters, no quote characters, and no 205// backslash characters, then we can safely slap some quotes around it. 206// Otherwise we must also replace the offending characters with safe escape 207// sequences. 208 209 escapeable.lastIndex = 0; 210 return escapeable.test(string) ? 211 '"' + string.replace(escapeable, function (a) { 212 var c = meta[a]; 213 if (typeof c === 'string') { 214 return c; 215 } 216 return '\\u' + ('0000' + 217 (+(a.charCodeAt(0))).toString(16)).slice(-4); 218 }) + '"' : 219 '"' + string + '"'; 220 } 221 222 223 function str(key, holder) { 224 225// Produce a string from holder[key]. 226 227 var i, // The loop counter. 228 k, // The member key. 229 v, // The member value. 230 length, 231 mind = gap, 232 partial, 233 value = holder[key]; 234 235// If the value has a toJSON method, call it to obtain a replacement value. 236 237 if (value && typeof value === 'object' && 238 typeof value.toJSON === 'function') { 239 value = value.toJSON(key); 240 } 241 242// If we were called with a replacer function, then call the replacer to 243// obtain a replacement value. 244 245 if (typeof rep === 'function') { 246 value = rep.call(holder, key, value); 247 } 248 249// What happens next depends on the value's type. 250 251 switch (typeof value) { 252 case 'string': 253 return quote(value); 254 255 case 'number': 256 257// JSON numbers must be finite. Encode non-finite numbers as null. 258 259 return isFinite(value) ? String(value) : 'null'; 260 261 case 'boolean': 262 case 'null': 263 264// If the value is a boolean or null, convert it to a string. Note: 265// typeof null does not produce 'null'. The case is included here in 266// the remote chance that this gets fixed someday. 267 268 return String(value); 269 270// If the type is 'object', we might be dealing with an object or an array or 271// null. 272 273 case 'object': 274 275// Due to a specification blunder in ECMAScript, typeof null is 'object', 276// so watch out for that case. 277 278 if (!value) { 279 return 'null';
280 } 281 282// Make an array to hold the partial results of stringifying this object value. 283 284 gap += indent; 285 partial = []; 286 287// If the object has a dontEnum length property, we'll treat it as an array. 288 289 if (typeof value.length === 'number' && 290 !(value.propertyIsEnumerable('length'))) { 291 292// The object is an array. Stringify every element. Use null as a placeholder 293// for non-JSON values. 294 295 length = value.length; 296 for (i = 0; i < length; i += 1) { 297 partial[i] = str(i, value) || 'null'; 298 } 299 300// Join all of the elements together, separated with commas, and wrap them in 301// brackets. 302 303 v = partial.length === 0 ? '[]' : 304 gap ? '[\n' + gap + 305 partial.join(',\n' + gap) + '\n' + 306 mind + ']' : 307 '[' + partial.join(',') + ']'; 308 gap = mind; 309 return v; 310 } 311 312// If the replacer is an array, use it to select the members to be stringified. 313 314 if (rep && typeof rep === 'object') { 315 length = rep.length; 316 for (i = 0; i < length; i += 1) { 317 k = rep[i]; 318 if (typeof k === 'string') { 319 v = str(k, value); 320 if (v) { 321 partial.push(quote(k) + (gap ? ': ' : ':') + v); 322 } 323 } 324 } 325 } else { 326 327// Otherwise, iterate through all of the keys in the object. 328 329 for (k in value) { 330 if (Object.hasOwnProperty.call(value, k)) { 331 v = str(k, value); 332 if (v) { 333 partial.push(quote(k) + (gap ? ': ' : ':') + v); 334 } 335 } 336 } 337 } 338 339// Join all of the member texts together, separated with commas, 340// and wrap them in braces. 341 342 v = partial.length === 0 ? '{}' : 343 gap ? '{\n' + gap + partial.join(',\n' + gap) + '\n' + 344 mind + '}' : '{' + partial.join(',') + '}'; 345 gap = mind; 346 return v; 347 } 348 } 349 350// Return the JSON object containing the stringify and parse methods. 351 352 return { 353 stringify: function (value, replacer, space) { 354 355// The stringify method takes a value and an optional replacer, and an optional 356// space parameter, and returns a JSON text. The replacer can be a function 357// that can replace values, or an array of strings that will select the keys. 358// A default replacer method can be provided. Use of the space parameter can 359// produce text that is more easily readable. 360 361 var i; 362 gap = ''; 363 indent = ''; 364 365// If the space parameter is a number, make an indent string containing that 366// many spaces. 367 368 if (typeof space === 'number') { 369 for (i = 0; i < space; i += 1) { 370 indent += ' '; 371 } 372 373// If the space parameter is a string, it will be used as the indent string. 374 375 } else if (typeof space === 'string') { 376 indent = space; 377 } 378 379// If there is a replacer, it must be a function or an array. 380// Otherwise, throw an error. 381 382 rep = replacer; 383 if (replacer && typeof replacer !== 'function' && 384 (typeof replacer !== 'object' || 385 typeof replacer.length !== 'number')) { 386 throw new Error('JSON.stringify'); 387 } 388 389// Make a fake root object containing our value under the key of ''. 390// Return the result of stringifying the value. 391 392 return str('', {'': value}); 393 }, 394 395 396 parse: function (text, reviver) { 397 398// The parse method takes a text and an optional reviver function, and returns 399// a JavaScript value if the text is a valid JSON text. 400 401 var j; 402 403 function walk(holder, key) { 404 405// The walk method is used to recursively walk the resulting structure so 406// that modifications can be made. 407 408 var k, v, value = holder[key]; 409 if (value && typeof value === 'object') { 410 for (k in value) { 411 if (Object.hasOwnProperty.call(value, k)) { 412 v = walk(value, k); 413 if (v !== undefined) { 414 value[k] = v; 415 } else { 416 delete value[k]; 417 } 418 } 419 } 420 } 421 return reviver.call(holder, key, value); 422 } 423 424 425// Parsing happens in four stages. In the first stage, we replace certain 426// Unicode characters with escape sequences. JavaScript handles many characters 427// incorrectly, either silently deleting them, or treating them as line endings. 428 429 cx.lastIndex = 0; 430 if (cx.test(text)) { 431 text = text.replace(cx, function (a) {
432 return '\\u' + ('0000' + 433 (+(a.charCodeAt(0))).toString(16)).slice(-4); 434 }); 435 } 436 437// In the second stage, we run the text against regular expressions that look 438// for non-JSON patterns. We are especially concerned with '()' and 'new' 439// because they can cause invocation, and '=' because it can cause mutation. 440// But just to be safe, we want to reject all unexpected forms. 441 442// We split the second stage into 4 regexp operations in order to work around 443// crippling inefficiencies in IE's and Safari's regexp engines. First we 444// replace the JSON backslash pairs with '@' (a non-JSON character). Second, we 445// replace all simple value tokens with ']' characters. Third, we delete all 446// open brackets that follow a colon or comma or that begin the text. Finally, 447// we look to see that the remaining characters are only whitespace or ']' or 448// ',' or ':' or '{' or '}'. If that is so, then the text is safe for eval. 449 450 if (/^[\],:{}\s]*$/. 451test(text.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, '@'). 452replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']'). 453replace(/(?:^|:|,)(?:\s*\[)+/g, ''))) { 454 455// In the third stage we use the eval function to compile the text into a 456// JavaScript structure. The '{' operator is subject to a syntactic ambiguity 457// in JavaScript: it can begin a block or an object literal. We wrap the text 458// in parens to eliminate the ambiguity. 459 460 j = eval('(' + text + ')'); 461 462// In the optional fourth stage, we recursively walk the new structure, passing 463// each name/value pair to a reviver function for possible transformation. 464 465 return typeof reviver === 'function' ? 466 walk({'': j}, '') : j; 467 } 468 469// If the text is not JSON parseable, then a SyntaxError is thrown. 470 471 throw new SyntaxError('JSON.parse'); 472 } 473 }; 474 }(); 475}
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