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view pylons_app/public/js/yui/json/json.js @ 449:ac21f018f6be
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author | Marcin Kuzminski <marcin@python-works.com> |
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date | Fri, 03 Sep 2010 09:23:50 +0200 |
parents | 564e40829f80 |
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/* Copyright (c) 2009, Yahoo! Inc. All rights reserved. Code licensed under the BSD License: http://developer.yahoo.net/yui/license.txt version: 2.8.0r4 */ /** * Provides methods to parse JSON strings and convert objects to JSON strings. * * @module json * @class JSON * @namespace YAHOO.lang * @static */ (function () { var l = YAHOO.lang, isFunction = l.isFunction, isObject = l.isObject, isArray = l.isArray, _toStr = Object.prototype.toString, // 'this' is the global object. window in browser env. Keep // the code env agnostic. Caja requies window, unfortunately. Native = (YAHOO.env.ua.caja ? window : this).JSON, /* Variables used by parse */ /** * Replace certain Unicode characters that JavaScript may handle incorrectly * during eval--either by deleting them or treating them as line * endings--with escape sequences. * IMPORTANT NOTE: This regex will be used to modify the input if a match is * found. * * @property _UNICODE_EXCEPTIONS * @type {RegExp} * @private */ _UNICODE_EXCEPTIONS = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g, /** * First step in the safety evaluation. Regex used to replace all escape * sequences (i.e. "\\", etc) with '@' characters (a non-JSON character). * * @property _ESCAPES * @type {RegExp} * @static * @private */ _ESCAPES = /\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, /** * Second step in the safety evaluation. Regex used to replace all simple * values with ']' characters. * * @property _VALUES * @type {RegExp} * @static * @private */ _VALUES = /"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, /** * Third step in the safety evaluation. Regex used to remove all open * square brackets following a colon, comma, or at the beginning of the * string. * * @property _BRACKETS * @type {RegExp} * @static * @private */ _BRACKETS = /(?:^|:|,)(?:\s*\[)+/g, /** * Final step in the safety evaluation. Regex used to test the string left * after all previous replacements for invalid characters. * * @property _UNSAFE * @type {RegExp} * @static * @private */ _UNSAFE = /^[\],:{}\s]*$/, /* Variables used by stringify */ /** * Regex used to replace special characters in strings for JSON * stringification. * * @property _SPECIAL_CHARS * @type {RegExp} * @static * @private */ _SPECIAL_CHARS = /[\\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g, /** * Character substitution map for common escapes and special characters. * * @property _CHARS * @type {Object} * @static * @private */ _CHARS = { '\b': '\\b', '\t': '\\t', '\n': '\\n', '\f': '\\f', '\r': '\\r', '"' : '\\"', '\\': '\\\\' }, UNDEFINED = 'undefined', OBJECT = 'object', NULL = 'null', STRING = 'string', NUMBER = 'number', BOOLEAN = 'boolean', DATE = 'date', _allowable = { 'undefined' : UNDEFINED, 'string' : STRING, '[object String]' : STRING, 'number' : NUMBER, '[object Number]' : NUMBER, 'boolean' : BOOLEAN, '[object Boolean]' : BOOLEAN, '[object Date]' : DATE, '[object RegExp]' : OBJECT }, EMPTY = '', OPEN_O = '{', CLOSE_O = '}', OPEN_A = '[', CLOSE_A = ']', COMMA = ',', COMMA_CR = ",\n", CR = "\n", COLON = ':', COLON_SP = ': ', QUOTE = '"'; // Only accept JSON objects that report a [[Class]] of JSON Native = _toStr.call(Native) === '[object JSON]' && Native; // Escapes a special character to a safe Unicode representation function _char(c) { if (!_CHARS[c]) { _CHARS[c] = '\\u'+('0000'+(+(c.charCodeAt(0))).toString(16)).slice(-4); } return _CHARS[c]; } /* functions used by parse */ /** * Traverses nested objects, applying a filter or reviver function to * each value. The value returned from the function will replace the * original value in the key:value pair. If the value returned is * undefined, the key will be omitted from the returned object. * * @method _revive * @param data {MIXED} Any JavaScript data * @param reviver {Function} filter or mutation function * @return {MIXED} The results of the filtered/mutated data structure * @private */ function _revive(data, reviver) { var walk = function (o,key) { var k,v,value = o[key]; if (value && typeof value === 'object') { for (k in value) { if (l.hasOwnProperty(value,k)) { v = walk(value, k); if (v === undefined) { delete value[k]; } else { value[k] = v; } } } } return reviver.call(o,key,value); }; return typeof reviver === 'function' ? walk({'':data},'') : data; } /** * Replace certain Unicode characters that may be handled incorrectly by * some browser implementations. * * @method _prepare * @param s {String} parse input * @return {String} sanitized JSON string ready to be validated/parsed * @private */ function _prepare(s) { return s.replace(_UNICODE_EXCEPTIONS, _char); } function _isSafe(str) { return l.isString(str) && _UNSAFE.test(str.replace(_ESCAPES,'@'). replace(_VALUES,']'). replace(_BRACKETS,'')); } function _parse(s,reviver) { // sanitize s = _prepare(s); // Ensure valid JSON if (_isSafe(s)) { // Eval the text into a JavaScript data structure, apply the // reviver function if provided, and return return _revive( eval('(' + s + ')'), reviver ); } // The text is not valid JSON throw new SyntaxError('JSON.parse'); } /* functions used by stringify */ // Utility function used to determine how to serialize a variable. function _type(o) { var t = typeof o; return _allowable[t] || // number, string, boolean, undefined _allowable[_toStr.call(o)] || // Number, String, Boolean, Date (t === OBJECT ? (o ? OBJECT : NULL) : // object, array, null, misc natives UNDEFINED); // function, unknown } // Enclose escaped strings in quotes function _string(s) { return QUOTE + s.replace(_SPECIAL_CHARS, _char) + QUOTE; } // Adds the provided space to the beginning of every line in the input string function _indent(s,space) { return s.replace(/^/gm, space); } // JavaScript implementation of stringify (see API declaration of stringify) function _stringify(o,w,space) { if (o === undefined) { return undefined; } var replacer = isFunction(w) ? w : null, format = _toStr.call(space).match(/String|Number/) || [], _date = YAHOO.lang.JSON.dateToString, stack = [], tmp,i,len; if (replacer || !isArray(w)) { w = undefined; } // Ensure whitelist keys are unique (bug 2110391) if (w) { tmp = {}; for (i = 0, len = w.length; i < len; ++i) { tmp[w[i]] = true; } w = tmp; } // Per the spec, strings are truncated to 10 characters and numbers // are converted to that number of spaces (max 10) space = format[0] === 'Number' ? new Array(Math.min(Math.max(0,space),10)+1).join(" ") : (space || EMPTY).slice(0,10); function _serialize(h,key) { var value = h[key], t = _type(value), a = [], colon = space ? COLON_SP : COLON, arr, i, keys, k, v; // Per the ECMA 5 spec, toJSON is applied before the replacer is // called. Also per the spec, Date.prototype.toJSON has been added, so // Date instances should be serialized prior to exposure to the // replacer. I disagree with this decision, but the spec is the spec. if (isObject(value) && isFunction(value.toJSON)) { value = value.toJSON(key); } else if (t === DATE) { value = _date(value); } if (isFunction(replacer)) { value = replacer.call(h,key,value); } if (value !== h[key]) { t = _type(value); } switch (t) { case DATE : // intentional fallthrough. Pre-replacer Dates are // serialized in the toJSON stage. Dates here would // have been produced by the replacer. case OBJECT : break; case STRING : return _string(value); case NUMBER : return isFinite(value) ? value+EMPTY : NULL; case BOOLEAN : return value+EMPTY; case NULL : return NULL; default : return undefined; } // Check for cyclical references in nested objects for (i = stack.length - 1; i >= 0; --i) { if (stack[i] === value) { throw new Error("JSON.stringify. Cyclical reference"); } } arr = isArray(value); // Add the object to the processing stack stack.push(value); if (arr) { // Array for (i = value.length - 1; i >= 0; --i) { a[i] = _serialize(value, i) || NULL; } } else { // Object // If whitelist provided, take only those keys keys = w || value; i = 0; for (k in keys) { if (keys.hasOwnProperty(k)) { v = _serialize(value, k); if (v) { a[i++] = _string(k) + colon + v; } } } } // remove the array from the stack stack.pop(); if (space && a.length) { return arr ? OPEN_A + CR + _indent(a.join(COMMA_CR), space) + CR + CLOSE_A : OPEN_O + CR + _indent(a.join(COMMA_CR), space) + CR + CLOSE_O; } else { return arr ? OPEN_A + a.join(COMMA) + CLOSE_A : OPEN_O + a.join(COMMA) + CLOSE_O; } } // process the input return _serialize({'':o},''); } /* Public API */ YAHOO.lang.JSON = { /** * Leverage native JSON parse if the browser has a native implementation. * In general, this is a good idea. See the Known Issues section in the * JSON user guide for caveats. The default value is true for browsers with * native JSON support. * * @property useNativeParse * @type Boolean * @default true * @static */ useNativeParse : !!Native, /** * Leverage native JSON stringify if the browser has a native * implementation. In general, this is a good idea. See the Known Issues * section in the JSON user guide for caveats. The default value is true * for browsers with native JSON support. * * @property useNativeStringify * @type Boolean * @default true * @static */ useNativeStringify : !!Native, /** * Four step determination whether a string is safe to eval. In three steps, * escape sequences, safe values, and properly placed open square brackets * are replaced with placeholders or removed. Then in the final step, the * result of all these replacements is checked for invalid characters. * * @method isSafe * @param str {String} JSON string to be tested * @return {boolean} is the string safe for eval? * @static */ isSafe : function (s) { return _isSafe(_prepare(s)); }, /** * <p>Parse a JSON string, returning the native JavaScript * representation.</p> * * <p>When lang.JSON.useNativeParse is true, this will defer to the native * JSON.parse if the browser has a native implementation. Otherwise, a * JavaScript implementation based on http://www.json.org/json2.js * is used.</p> * * @method parse * @param s {string} JSON string data * @param reviver {function} (optional) function(k,v) passed each key:value * pair of object literals, allowing pruning or altering values * @return {MIXED} the native JavaScript representation of the JSON string * @throws SyntaxError * @static */ parse : function (s,reviver) { return Native && YAHOO.lang.JSON.useNativeParse ? Native.parse(s,reviver) : _parse(s,reviver); }, /** * <p>Converts an arbitrary value to a JSON string representation.</p> * * <p>Objects with cyclical references will trigger an exception.</p> * * <p>If a whitelist is provided, only matching object keys will be * included. Alternately, a replacer function may be passed as the * second parameter. This function is executed on every value in the * input, and its return value will be used in place of the original value. * This is useful to serialize specialized objects or class instances.</p> * * <p>If a positive integer or non-empty string is passed as the third * parameter, the output will be formatted with carriage returns and * indentation for readability. If a String is passed (such as "\t") it * will be used once for each indentation level. If a number is passed, * that number of spaces will be used.</p> * * <p>When lang.JSON.useNativeStringify is true, this will defer to the * native JSON.stringify if the browser has a native implementation. * Otherwise, a JavaScript implementation is used.</p> * * @method stringify * @param o {MIXED} any arbitrary object to convert to JSON string * @param w {Array|Function} (optional) whitelist of acceptable object keys * to include OR a function(value,key) to alter values * before serialization * @param space {Number|String} (optional) indentation character(s) or * depthy of spaces to format the output * @return {string} JSON string representation of the input * @throws Error * @static */ stringify : function (o,w,space) { return Native && YAHOO.lang.JSON.useNativeStringify ? Native.stringify(o,w,space) : _stringify(o,w,space); }, /** * Serializes a Date instance as a UTC date string. Used internally by * the JavaScript implementation of stringify. If you need a different * Date serialization format, override this method. If you change this, * you should also set useNativeStringify to false, since native JSON * implementations serialize Dates per the ECMAScript 5 spec. You've been * warned. * * @method dateToString * @param d {Date} The Date to serialize * @return {String} stringified Date in UTC format YYYY-MM-DDTHH:mm:SSZ * @static */ dateToString : function (d) { function _zeroPad(v) { return v < 10 ? '0' + v : v; } return d.getUTCFullYear() + '-' + _zeroPad(d.getUTCMonth() + 1) + '-' + _zeroPad(d.getUTCDate()) + 'T' + _zeroPad(d.getUTCHours()) + COLON + _zeroPad(d.getUTCMinutes()) + COLON + _zeroPad(d.getUTCSeconds()) + 'Z'; }, /** * Reconstitute Date instances from the default JSON UTC serialization. * Reference this from a reviver function to rebuild Dates during the * parse operation. * * @method stringToDate * @param str {String} String serialization of a Date * @return {Date} */ stringToDate : function (str) { var m = str.match(/^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})(?:\.(\d{3}))?Z$/); if (m) { var d = new Date(); d.setUTCFullYear(m[1], m[2]-1, m[3]); d.setUTCHours(m[4], m[5], m[6], (m[7] || 0)); return d; } return str; } }; /** * <p>Four step determination whether a string is safe to eval. In three steps, * escape sequences, safe values, and properly placed open square brackets * are replaced with placeholders or removed. Then in the final step, the * result of all these replacements is checked for invalid characters.</p> * * <p>This is an alias for isSafe.</p> * * @method isValid * @param str {String} JSON string to be tested * @return {boolean} is the string safe for eval? * @static * @deprecated use isSafe */ YAHOO.lang.JSON.isValid = YAHOO.lang.JSON.isSafe; })(); YAHOO.register("json", YAHOO.lang.JSON, {version: "2.8.0r4", build: "2449"});