497 lines
16 KiB
JavaScript
497 lines
16 KiB
JavaScript
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/*
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Copyright (c) 2009, Yahoo! Inc. All rights reserved.
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Code licensed under the BSD License:
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http://developer.yahoo.net/yui/license.txt
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version: 3.0.0
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build: 1549
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*/
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YUI.add('json-parse', function(Y) {
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/**
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* <p>The JSON module adds support for serializing JavaScript objects into
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* JSON strings and parsing JavaScript objects from strings in JSON format.</p>
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*
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* <p>The JSON namespace is added to your YUI instance including static methods
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* Y.JSON.parse(..) and Y.JSON.stringify(..).</p>
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*
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* <p>The functionality and method signatures follow the ECMAScript 5
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* specification. In browsers with native JSON support, the native
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* implementation is used.</p>
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*
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* <p>The <code>json</code> module is a rollup of <code>json-parse</code> and
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* <code>json-stringify</code>.</p>
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*
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* <p>As their names suggest, <code>json-parse</code> adds support for parsing
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* JSON data (Y.JSON.parse) and <code>json-stringify</code> for serializing
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* JavaScript data into JSON strings (Y.JSON.stringify). You may choose to
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* include either of the submodules individually if you don't need the
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* complementary functionality, or include the rollup for both.</p>
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*
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* @module json
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* @class JSON
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* @static
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*/
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/**
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* Provides Y.JSON.parse method to accept JSON strings and return native
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* JavaScript objects.
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*
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* @module json
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* @submodule json-parse
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* @for JSON
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* @static
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*/
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// All internals kept private for security reasons
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/**
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* Alias to native browser implementation of the JSON object if available.
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*
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* @property Native
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* @type {Object}
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* @private
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*/
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var _JSON = Y.config.win.JSON,
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Native = (Object.prototype.toString.call(_JSON) === '[object JSON]' && _JSON),
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/**
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* Replace certain Unicode characters that JavaScript may handle incorrectly
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* during eval--either by deleting them or treating them as line
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* endings--with escape sequences.
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* IMPORTANT NOTE: This regex will be used to modify the input if a match is
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* found.
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*
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* @property _UNICODE_EXCEPTIONS
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* @type {RegExp}
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* @private
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*/
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_UNICODE_EXCEPTIONS = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
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/**
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* First step in the safety evaluation. Regex used to replace all escape
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* sequences (i.e. "\\", etc) with '@' characters (a non-JSON character).
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*
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* @property _ESCAPES
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* @type {RegExp}
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* @private
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*/
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_ESCAPES = /\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g,
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/**
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* Second step in the safety evaluation. Regex used to replace all simple
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* values with ']' characters.
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*
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* @property _VALUES
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* @type {RegExp}
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* @private
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*/
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_VALUES = /"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g,
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/**
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* Third step in the safety evaluation. Regex used to remove all open
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* square brackets following a colon, comma, or at the beginning of the
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* string.
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*
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* @property _BRACKETS
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* @type {RegExp}
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* @private
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*/
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_BRACKETS = /(?:^|:|,)(?:\s*\[)+/g,
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/**
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* Final step in the safety evaluation. Regex used to test the string left
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* after all previous replacements for invalid characters.
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*
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* @property _UNSAFE
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* @type {RegExp}
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* @private
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*/
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_UNSAFE = /[^\],:{}\s]/,
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/**
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* Replaces specific unicode characters with their appropriate \unnnn
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* format. Some browsers ignore certain characters during eval.
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*
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* @method escapeException
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* @param c {String} Unicode character
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* @return {String} the \unnnn escapement of the character
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* @private
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*/
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_escapeException = function (c) {
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return '\\u'+('0000'+(+(c.charCodeAt(0))).toString(16)).slice(-4);
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},
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/**
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* Traverses nested objects, applying a reviver function to each (key,value)
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* from the scope if the key:value's containing object. The value returned
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* from the function will replace the original value in the key:value pair.
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* If the value returned is undefined, the key will be omitted from the
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* returned object.
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*
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* @method _revive
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* @param data {MIXED} Any JavaScript data
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* @param reviver {Function} filter or mutation function
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* @return {MIXED} The results of the filtered data
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* @private
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*/
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_revive = function (data, reviver) {
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var walk = function (o,key) {
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var k,v,value = o[key];
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if (value && typeof value === 'object') {
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for (k in value) {
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if (value.hasOwnProperty(k)) {
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v = walk(value, k);
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if (v === undefined) {
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delete value[k];
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} else {
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value[k] = v;
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}
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}
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}
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}
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return reviver.call(o,key,value);
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};
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return typeof reviver === 'function' ? walk({'':data},'') : data;
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},
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/**
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* Parse a JSON string, returning the native JavaScript representation.
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*
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* @param s {string} JSON string data
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* @param reviver {function} (optional) function(k,v) passed each key value
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* pair of object literals, allowing pruning or altering values
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* @return {MIXED} the native JavaScript representation of the JSON string
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* @throws SyntaxError
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* @method parse
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* @static
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*/
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// JavaScript implementation in lieu of native browser support. Based on
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// the json2.js library from http://json.org
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_parse = function (s,reviver) {
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if (typeof s === 'string') {
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// Replace certain Unicode characters that are otherwise handled
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// incorrectly by some browser implementations.
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// NOTE: This modifies the input if such characters are found!
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s = s.replace(_UNICODE_EXCEPTIONS, _escapeException);
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// Test for any remaining invalid characters
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if (!_UNSAFE.test(s.replace(_ESCAPES,'@').
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replace(_VALUES,']').
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replace(_BRACKETS,''))) {
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// Eval the text into a JavaScript data structure, apply any
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// reviver function, and return
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return _revive( eval('(' + s + ')'), reviver );
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}
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}
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throw new SyntaxError('JSON.parse');
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};
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Y.namespace('JSON').parse = function (s,reviver) {
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return Native && Y.JSON.useNativeParse ?
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Native.parse(s,reviver) : _parse(s,reviver);
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};
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/**
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* Leverage native JSON parse if the browser has a native implementation.
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* In general, this is a good idea. See the Known Issues section in the
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* JSON user guide for caveats. The default value is true for browsers with
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* native JSON support.
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*
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* @property useNativeParse
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* @type Boolean
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* @default true
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* @static
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*/
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Y.JSON.useNativeParse = !!Native;
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}, '3.0.0' );
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YUI.add('json-stringify', function(Y) {
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/**
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* Provides Y.JSON.stringify method for converting objects to JSON strings.
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*
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* @module json
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* @submodule json-stringify
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* @for JSON
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* @static
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*/
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var _JSON = Y.config.win.JSON,
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Lang = Y.Lang,
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isFunction= Lang.isFunction,
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isObject = Lang.isObject,
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isArray = Lang.isArray,
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_toStr = Object.prototype.toString,
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Native = (_toStr.call(_JSON) === '[object JSON]' && _JSON),
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UNDEFINED = 'undefined',
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OBJECT = 'object',
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NULL = 'null',
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STRING = 'string',
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NUMBER = 'number',
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BOOLEAN = 'boolean',
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DATE = 'date',
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_allowable= {
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'undefined' : UNDEFINED,
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'string' : STRING,
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'[object String]' : STRING,
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'number' : NUMBER,
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'[object Number]' : NUMBER,
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'boolean' : BOOLEAN,
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'[object Boolean]' : BOOLEAN,
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'[object Date]' : DATE,
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'[object RegExp]' : OBJECT
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},
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EMPTY = '',
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OPEN_O = '{',
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CLOSE_O = '}',
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OPEN_A = '[',
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CLOSE_A = ']',
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COMMA = ',',
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COMMA_CR = ",\n",
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CR = "\n",
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COLON = ':',
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COLON_SP = ': ',
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QUOTE = '"',
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// Regex used to capture characters that need escaping before enclosing
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// their containing string in quotes.
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_SPECIAL_CHARS = /[\\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
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// Character substitution map for common escapes and special characters.
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_CHARS = {
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'\b': '\\b',
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'\t': '\\t',
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'\n': '\\n',
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'\f': '\\f',
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'\r': '\\r',
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'"' : '\\"',
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'\\': '\\\\'
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};
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// Utility function used to determine how to serialize a variable.
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function _type(o) {
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var t = typeof o;
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return _allowable[t] || // number, string, boolean, undefined
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_allowable[_toStr.call(o)] || // Number, String, Boolean, Date
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(t === OBJECT ?
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(o ? OBJECT : NULL) : // object, array, null, misc natives
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UNDEFINED); // function, unknown
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}
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// Escapes a special character to a safe Unicode representation
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function _char(c) {
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if (!_CHARS[c]) {
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_CHARS[c] = '\\u'+('0000'+(+(c.charCodeAt(0))).toString(16)).slice(-4);
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}
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return _CHARS[c];
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}
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// Enclose escaped strings in quotes
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function _string(s) {
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return QUOTE + s.replace(_SPECIAL_CHARS, _char) + QUOTE;
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}
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// Adds the provided space to the beginning of every line in the input string
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function _indent(s,space) {
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return s.replace(/^/gm, space);
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}
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// JavaScript implementation of stringify (see API declaration of stringify)
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function _stringify(o,w,space) {
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if (o === undefined) {
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return undefined;
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}
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var replacer = isFunction(w) ? w : null,
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format = _toStr.call(space).match(/String|Number/) || [],
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_date = Y.JSON.dateToString,
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stack = [],
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tmp,i,len;
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if (replacer || !isArray(w)) {
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w = undefined;
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}
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// Ensure whitelist keys are unique (bug 2110391)
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if (w) {
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tmp = {};
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for (i = 0, len = w.length; i < len; ++i) {
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tmp[w[i]] = true;
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}
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w = tmp;
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}
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// Per the spec, strings are truncated to 10 characters and numbers
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// are converted to that number of spaces (max 10)
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space = format[0] === 'Number' ?
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new Array(Math.min(Math.max(0,space),10)+1).join(" ") :
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(space || EMPTY).slice(0,10);
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function _serialize(h,key) {
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var value = h[key],
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t = _type(value),
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a = [],
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colon = space ? COLON_SP : COLON,
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arr, i, keys, k, v;
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// Per the ECMA 5 spec, toJSON is applied before the replacer is
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// called. Also per the spec, Date.prototype.toJSON has been added, so
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// Date instances should be serialized prior to exposure to the
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// replacer. I disagree with this decision, but the spec is the spec.
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if (isObject(value) && isFunction(value.toJSON)) {
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value = value.toJSON(key);
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} else if (t === DATE) {
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value = _date(value);
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}
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if (isFunction(replacer)) {
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value = replacer.call(h,key,value);
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}
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if (value !== h[key]) {
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t = _type(value);
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}
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switch (t) {
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case DATE : // intentional fallthrough. Pre-replacer Dates are
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// serialized in the toJSON stage. Dates here would
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// have been produced by the replacer.
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case OBJECT : break;
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case STRING : return _string(value);
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case NUMBER : return isFinite(value) ? value+EMPTY : NULL;
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case BOOLEAN : return value+EMPTY;
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case NULL : return NULL;
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default : return undefined;
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}
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// Check for cyclical references in nested objects
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for (i = stack.length - 1; i >= 0; --i) {
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if (stack[i] === value) {
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throw new Error("JSON.stringify. Cyclical reference");
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}
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}
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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},'');
|
||
|
|
}
|
||
|
|
|
||
|
|
Y.mix(Y.namespace('JSON'),{
|
||
|
|
/**
|
||
|
|
* 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 JSON.useNativeStringify
|
||
|
|
* @type Boolean
|
||
|
|
* @default true
|
||
|
|
* @static
|
||
|
|
*/
|
||
|
|
useNativeStringify : !!Native,
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Serializes a Date instance as a UTC date string. Used internally by
|
||
|
|
* stringify. Override this method if you need Dates serialized in a
|
||
|
|
* different format.
|
||
|
|
*
|
||
|
|
* @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';
|
||
|
|
},
|
||
|
|
|
||
|
|
/**
|
||
|
|
* <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>
|
||
|
|
*
|
||
|
|
* @method stringify
|
||
|
|
* @param o {MIXED} any arbitrary value to convert to JSON string
|
||
|
|
* @param w {Array|Function} (optional) whitelist of acceptable object
|
||
|
|
* keys to include, or a replacer function to modify the
|
||
|
|
* raw value before serialization
|
||
|
|
* @param ind {Number|String} (optional) indentation character or depth of
|
||
|
|
* spaces to format the output.
|
||
|
|
* @return {string} JSON string representation of the input
|
||
|
|
* @static
|
||
|
|
*/
|
||
|
|
stringify : function (o,w,ind) {
|
||
|
|
return Native && Y.JSON.useNativeStringify ?
|
||
|
|
Native.stringify(o,w,ind) : _stringify(o,w,ind);
|
||
|
|
}
|
||
|
|
});
|
||
|
|
|
||
|
|
|
||
|
|
}, '3.0.0' );
|
||
|
|
|
||
|
|
|
||
|
|
YUI.add('json', function(Y){}, '3.0.0' ,{use:['json-parse', 'json-stringify']});
|
||
|
|
|