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Copyright (c) 2008, 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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YUI.add('json-parse', function(Y) {
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* The JSON Utility provides methods to serialize JavaScript objects into
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* JSON strings and parse JavaScript objects from strings containing JSON data.
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* Three modules are available for inclusion:
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* <li>1. <code>json-parse</code> for parsing JSON strings into native JavaScript data</li>
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* <li>2. <code>json-stringify</code> for stringification of JavaScript objects into JSON strings</li>
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* <li>3. <code>json</code> for both parsing and stringification</li>
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* Both <code>json-parse</code> and <code>json-stringify</code> create functions in a static JSON class under your YUI instance (e.g. Y.JSON.parse(..)).
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* Provides Y.JSON.parse method to take JSON strings and return native
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* @submodule json-parse
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Y.JSON = Y.JSON || {};
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// All internals kept private for security reasons
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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 endings--with
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* IMPORTANT NOTE: This regex will be used to modify the input if a match is
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* @property _UNICODE_EXCEPTIONS
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var _UNICODE_EXCEPTIONS = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
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* First step in the validation. Regex used to replace all escape
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* sequences (i.e. "\\", etc) with '@' characters (a non-JSON character).
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_ESCAPES = /\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g,
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* Second step in the validation. Regex used to replace all simple
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* values with ']' characters.
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_VALUES = /"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g,
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* Third step in the validation. Regex used to remove all open square
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* brackets following a colon, comma, or at the beginning of the string.
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_BRACKETS = /(?:^|:|,)(?:\s*\[)+/g,
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* Final step in the validation. Regex used to test the string left after
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* all previous replacements for invalid characters.
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_INVALID = /^[\],:{}\s]*$/,
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has = Object.prototype.hasOwnProperty,
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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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* @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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_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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if (has.call(value,k)) {
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if (v === undefined) {
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return reviver.call(o,key,value);
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return typeof reviver === 'function' ? walk({'':data},'') : data;
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* Parse a JSON string, returning the native JavaScript representation.
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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 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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Y.JSON.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, function (c) {
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return '\\u'+('0000'+(+(c.charCodeAt(0))).toString(16)).slice(-4);
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if (_INVALID.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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// The text is not JSON parsable
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throw new SyntaxError('parseJSON');
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loggerhead/static/javascript/yui/build/json/json-parse-debug.js
