• Classes
• Modules
• Everything

 /**
 * <p>The JSON module adds support for serializing JavaScript objects into
 * JSON strings and parsing JavaScript objects from strings in JSON format.</p>
 *
 * <p>The JSON namespace is added to your YUI instance including static methods
 * Y.JSON.parse(..) and Y.JSON.stringify(..).</p>
 *
 * <p>The functionality and method signatures follow the ECMAScript 5
 * specification. In browsers with native JSON support, the native
 * implementation is used.</p>
 *
 * <p>The <code>json</code> module is a rollup of <code>json-parse</code> and
 * <code>json-stringify</code>.</p>
 *
 * <p>As their names suggest, <code>json-parse</code> adds support for parsing
 * JSON data (Y.JSON.parse) and <code>json-stringify</code> for serializing
 * JavaScript data into JSON strings (Y.JSON.stringify). You may choose to
 * include either of the submodules individually if you don't need the
 * complementary functionality, or include the rollup for both.</p>
 *
 * @module json
 * @main json
 * @class JSON
 * @static
 */
 
 /**
 * Provides Y.JSON.parse method to accept JSON strings and return native
 * JavaScript objects.
 *
 * @module json
 * @submodule json-parse
 * @for JSON
 * @static
 */
 
 
 /**
 * 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
 */
 var _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}
 * @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}
 * @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}
 * @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}
 * @private
 */
 _UNSAFE = /[^\],:{}\s]/,
 
 /**
 * Replaces specific unicode characters with their appropriate \unnnn
 * format. Some browsers ignore certain characters during eval.
 *
 * @method escapeException
 * @param c {String} Unicode character
 * @return {String} the \unnnn escapement of the character
 * @private
 */
 _escapeException = function (c) {
 return '\\u'+('0000'+(+(c.charCodeAt(0))).toString(16)).slice(-4);
 },
 
 /**
 * Traverses nested objects, applying a reviver function to each (key,value)
 * from the scope if the key:value's containing object. 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 data
 * @private
 */
 _revive = function (data, reviver) {
 var walk = function (o,key) {
 var k,v,value = o[key];
 if (value && typeof value === 'object') {
 for (k in value) {
 if (value.hasOwnProperty(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;
 };
 
 /**
 * Parse a JSON string, returning the native JavaScript representation.
 *
 * @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
 * @method parse
 * @static
 */
 // JavaScript implementation in lieu of native browser support. Based on
 // the json2.js library from http://json.org
 Y.JSON.parse = function (s,reviver) {
 if (typeof s !== 'string') {
 s += '';
 }
 
 // Replace certain Unicode characters that are otherwise handled
 // incorrectly by some browser implementations.
 // NOTE: This modifies the input if such characters are found!
 s = s.replace(_UNICODE_EXCEPTIONS, _escapeException);
 
 // Test for any remaining invalid characters
 if (!_UNSAFE.test(s.replace(_ESCAPES,'@').
 replace(_VALUES,']').
 replace(_BRACKETS,''))) {
 
 // Eval the text into a JavaScript data structure, apply any
 // reviver function, and return
 return _revive(eval('(' + s + ')'), reviver);
 }
 
 throw new SyntaxError('JSON.parse');
 };
 
 // Property available for testing if the implementation being used
 // is native or a shim
 Y.JSON.parse.isShim = true;