1 /* 2 @fileOverview http://www.JSON.org/json2.js 3 4 2010-08-25 5 6 Public Domain. 7 8 NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK. 9 10 See http://www.JSON.org/js.html 11 12 13 This code should be minified before deployment. 14 See http://javascript.crockford.com/jsmin.html 15 16 USE YOUR OWN COPY. IT IS EXTREMELY UNWISE TO LOAD CODE FROM SERVERS YOU DO 17 NOT CONTROL. 18 19 20 This file creates a global JSON object containing two methods: stringify 21 and parse. 22 23 JSON.stringify(value, replacer, space) 24 value any JavaScript value, usually an object or array. 25 26 replacer an optional parameter that determines how object 27 values are stringified for objects. It can be a 28 function or an array of strings. 29 30 space an optional parameter that specifies the indentation 31 of nested structures. If it is omitted, the text will 32 be packed without extra whitespace. If it is a number, 33 it will specify the number of spaces to indent at each 34 level. If it is a string (such as '\t' or ' '), 35 it contains the characters used to indent at each level. 36 37 This method produces a JSON text from a JavaScript value. 38 39 When an object value is found, if the object contains a toJSON 40 method, its toJSON method will be called and the result will be 41 stringified. A toJSON method does not serialize: it returns the 42 value represented by the name/value pair that should be serialized, 43 or undefined if nothing should be serialized. The toJSON method 44 will be passed the key associated with the value, and this will be 45 bound to the value 46 47 For example, this would serialize Dates as ISO strings. 48 49 Date.prototype.toJSON = function (key) { 50 function f(n) { 51 // Format integers to have at least two digits. 52 return n < 10 ? '0' + n : n; 53 } 54 55 return this.getUTCFullYear() + '-' + 56 f(this.getUTCMonth() + 1) + '-' + 57 f(this.getUTCDate()) + 'T' + 58 f(this.getUTCHours()) + ':' + 59 f(this.getUTCMinutes()) + ':' + 60 f(this.getUTCSeconds()) + 'Z'; 61 }; 62 63 You can provide an optional replacer method. It will be passed the 64 key and value of each member, with this bound to the containing 65 object. The value that is returned from your method will be 66 serialized. If your method returns undefined, then the member will 67 be excluded from the serialization. 68 69 If the replacer parameter is an array of strings, then it will be 70 used to select the members to be serialized. It filters the results 71 such that only members with keys listed in the replacer array are 72 stringified. 73 74 Values that do not have JSON representations, such as undefined or 75 functions, will not be serialized. Such values in objects will be 76 dropped; in arrays they will be replaced with null. You can use 77 a replacer function to replace those with JSON values. 78 JSON.stringify(undefined) returns undefined. 79 80 The optional space parameter produces a stringification of the 81 value that is filled with line breaks and indentation to make it 82 easier to read. 83 84 If the space parameter is a non-empty string, then that string will 85 be used for indentation. If the space parameter is a number, then 86 the indentation will be that many spaces. 87 88 Example: 89 90 text = JSON.stringify(['e', {pluribus: 'unum'}]); 91 // text is '["e",{"pluribus":"unum"}]' 92 93 94 text = JSON.stringify(['e', {pluribus: 'unum'}], null, '\t'); 95 // text is '[\n\t"e",\n\t{\n\t\t"pluribus": "unum"\n\t}\n]' 96 97 text = JSON.stringify([new Date()], function (key, value) { 98 return this[key] instanceof Date ? 99 'Date(' + this[key] + ')' : value; 100 }); 101 // text is '["Date(---current time---)"]' 102 103 104 JSON.parse(text, reviver) 105 This method parses a JSON text to produce an object or array. 106 It can throw a SyntaxError exception. 107 108 The optional reviver parameter is a function that can filter and 109 transform the results. It receives each of the keys and values, 110 and its return value is used instead of the original value. 111 If it returns what it received, then the structure is not modified. 112 If it returns undefined then the member is deleted. 113 114 Example: 115 116 // Parse the text. Values that look like ISO date strings will 117 // be converted to Date objects. 118 119 myData = JSON.parse(text, function (key, value) { 120 var a; 121 if (typeof value === 'string') { 122 a = 123 /^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2}(?:\.\d*)?)Z$/.exec(value); 124 if (a) { 125 return new Date(Date.UTC(+a[1], +a[2] - 1, +a[3], +a[4], 126 +a[5], +a[6])); 127 } 128 } 129 return value; 130 }); 131 132 myData = JSON.parse('["Date(09/09/2001)"]', function (key, value) { 133 var d; 134 if (typeof value === 'string' && 135 value.slice(0, 5) === 'Date(' && 136 value.slice(-1) === ')') { 137 d = new Date(value.slice(5, -1)); 138 if (d) { 139 return d; 140 } 141 } 142 return value; 143 }); 144 145 146 This is a reference implementation. You are free to copy, modify, or 147 redistribute. 148 */ 149 150 /*jslint evil: true, strict: false */ 151 152 /*members "", "\b", "\t", "\n", "\f", "\r", "\"", JSON, "\\", apply, 153 call, charCodeAt, getUTCDate, getUTCFullYear, getUTCHours, 154 getUTCMinutes, getUTCMonth, getUTCSeconds, hasOwnProperty, join, 155 lastIndex, length, parse, prototype, push, replace, slice, stringify, 156 test, toJSON, toString, valueOf 157 */ 158 159 160 // Create a JSON object only if one does not already exist. We create the 161 // methods in a closure to avoid creating global variables. 162 163 KISSY.add("json/json2", function(S, UA) { 164 var win = S.Env.host,JSON = win.JSON; 165 // ie 8.0.7600.16315@win7 json 有问题 166 if (!JSON || UA['ie'] < 9) { 167 JSON = win.JSON = {}; 168 } 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) { 212 213 // 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 JSON.stringify = function (value, replacer, space) { 359 360 // The stringify method takes a value and an optional replacer, and an optional 361 // space parameter, and returns a JSON text. The replacer can be a function 362 // that can replace values, or an array of strings that will select the keys. 363 // A default replacer method can be provided. Use of the space parameter can 364 // produce text that is more easily readable. 365 366 var i; 367 gap = ''; 368 indent = ''; 369 370 // If the space parameter is a number, make an indent string containing that 371 // many spaces. 372 373 if (typeof space === 'number') { 374 for (i = 0; i < space; i += 1) { 375 indent += ' '; 376 } 377 378 // If the space parameter is a string, it will be used as the indent string. 379 380 } else if (typeof space === 'string') { 381 indent = space; 382 } 383 384 // If there is a replacer, it must be a function or an array. 385 // Otherwise, throw an error. 386 387 rep = replacer; 388 if (replacer && typeof replacer !== 'function' && 389 (typeof replacer !== 'object' || 390 typeof replacer.length !== 'number')) { 391 throw new Error('JSON.stringify'); 392 } 393 394 // Make a fake root object containing our value under the key of ''. 395 // Return the result of stringifying the value. 396 397 return str('', {'': value}); 398 }; 399 } 400 401 402 // If the JSON object does not yet have a parse method, give it one. 403 404 if (typeof JSON.parse !== 'function') { 405 JSON.parse = function (text, reviver) { 406 407 // The parse method takes a text and an optional reviver function, and returns 408 // a JavaScript value if the text is a valid JSON text. 409 410 var j; 411 412 function walk(holder, key) { 413 414 // The walk method is used to recursively walk the resulting structure so 415 // that modifications can be made. 416 417 var k, v, value = holder[key]; 418 if (value && typeof value === 'object') { 419 for (k in value) { 420 if (Object.hasOwnProperty.call(value, k)) { 421 v = walk(value, k); 422 if (v !== undefined) { 423 value[k] = v; 424 } else { 425 delete value[k]; 426 } 427 } 428 } 429 } 430 return reviver.call(holder, key, value); 431 } 432 433 434 // Parsing happens in four stages. In the first stage, we replace certain 435 // Unicode characters with escape sequences. JavaScript handles many characters 436 // incorrectly, either silently deleting them, or treating them as line endings. 437 438 text = String(text); 439 cx['lastIndex'] = 0; 440 if (cx.test(text)) { 441 text = text.replace(cx, function (a) { 442 return '\\u' + 443 ('0000' + a.charCodeAt(0).toString(16)).slice(-4); 444 }); 445 } 446 447 // In the second stage, we run the text against regular expressions that look 448 // for non-JSON patterns. We are especially concerned with '()' and 'new' 449 // because they can cause invocation, and '=' because it can cause mutation. 450 // But just to be safe, we want to reject all unexpected forms. 451 452 // We split the second stage into 4 regexp operations in order to work around 453 // crippling inefficiencies in IE's and Safari's regexp engines. First we 454 // replace the JSON backslash pairs with '@' (a non-JSON character). Second, we 455 // replace all simple value tokens with ']' characters. Third, we delete all 456 // open brackets that follow a colon or comma or that begin the text. Finally, 457 // we look to see that the remaining characters are only whitespace or ']' or 458 // ',' or ':' or '{' or '}'. If that is so, then the text is safe for eval. 459 460 if (/^[\],:{}\s]*$/ 461 .test(text.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, '@') 462 .replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']') 463 .replace(/(?:^|:|,)(?:\s*\[)+/g, ''))) { 464 465 // In the third stage we use the eval function to compile the text into a 466 // JavaScript structure. The '{' operator is subject to a syntactic ambiguity 467 // in JavaScript: it can begin a block or an object literal. We wrap the text 468 // in parens to eliminate the ambiguity. 469 470 j = eval('(' + text + ')'); 471 472 // In the optional fourth stage, we recursively walk the new structure, passing 473 // each name/value pair to a reviver function for possible transformation. 474 475 return typeof reviver === 'function' ? 476 walk({'': j}, '') : j; 477 } 478 479 // If the text is not JSON parseable, then a SyntaxError is thrown. 480 481 throw new SyntaxError('JSON.parse'); 482 }; 483 } 484 return JSON; 485 }, {requires:['ua']}); 486