/*!
* Copyright (c) 2009 Andreas Blixt <andreas@blixt.org>
* This and more JavaScript libraries: http://blixt.org/js
* MIT License: http://www.opensource.org/licenses/mit-license.php
* 
* Simple JSON encoder/decoder
* Encodes/decodes JavaScript values as JSON (see http://json.org/)
*/
/* Example:
*     var json = JSON.stringify({abc: 123, def: "ghi", jkl: [4, 5, 6]});
*     // Same result as:
*     var json = '{"abc":123,"def":"ghi","jkl":[4,5,6]}';
*/

// Prevent hiding the native JSON object in browsers that support it.
if (!JSON) {
var JSON = (function() {
	var 
	// Missing \u2060-\u206f which won't parse in older Opera browsers.
	escapable = new RegExp('[\\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f' +
						   '\u17b4\u17b5\u200c-\u200f\u2028-\u202f\ufeff' +
						   '\ufff0-\uffff]', 'g'),
	special = { '\b': '\\b', '\t': '\\t', '\n': '\\n', '\f': '\\f', '\r': '\\r',
		'"': '\\"', '\\': '\\\\'
	},

	replace = function(chr) {
		return special[chr] || '\\u' + ('000' +
			   chr.charCodeAt(0).toString(16)).slice(-4);
	};

	return {
		// Takes a value and returns its JSON representation, or null if the
		// value could not be converted to JSON.
		stringify: function(value) {
			switch (typeof value) {
				case 'string':
					return '"' + value.replace(escapable, replace) + '"';
				case 'object':
					if (value == null) return 'null';

					var v = [], json, i, l, p;

					if (value instanceof Array) {
						for (i = 0, l = value.length; i < l; i++) {
							if ((json = JSON.stringify(value[i])) != null)
								v[v.length] = json;
						}
						return '[' + v + ']';
					}

					for (p in value) {
						if ((json = JSON.stringify(value[p])) != null)
							v[v.length] = JSON.stringify(p) + ':' + json;
					}
					return '{' + v + '}';
				case 'number':
					return isFinite(value) ? String(value) : 'null';
				case 'boolean':
					return String(value);
			}

			return null;
		},
		// Loads the JSON string and returns the value that it represents. Does
		// not check validity or security of the string!
		parse: function(json) {
			if (typeof json != 'string') return null;
			return JSON.e('(' + json + ')');
		}
	};
})();

// Create an eval that does not have access to closures.
JSON.e = function(c) { return eval(c); };
}