/**
 * jQuery JSON Plugin version: 2.3 (2011-09-17) This document is licensed as
 * free software under the terms of the MIT License:
 * http://www.opensource.org/licenses/mit-license.php Brantley Harris wrote this
 * plugin. It is based somewhat on the JSON.org website's
 * http://www.json.org/json2.js, which proclaims: "NO WARRANTY EXPRESSED OR
 * IMPLIED. USE AT YOUR OWN RISK.", a sentiment that I uphold. It is also
 * influenced heavily by MochiKit's serializeJSON, which is copyrighted 2005 by
 * Bob Ippolito.
 */

(function($)
{

	var escapeable = /["\\\x00-\x1f\x7f-\x9f]/g,
		meta = {
			'\b'	: '\\b',
			'\t'	: '\\t',
			'\n'	: '\\n',
			'\f'	: '\\f',
			'\r'	: '\\r',
			'"'		: '\\"',
			'\\'	: '\\\\'
		};

	/**
	 * jQuery.toJSON Converts the given argument into a JSON respresentation.
	 * 
	 * @param o
	 *            {Mixed} The json-serializble *thing* to be converted If an
	 *            object has a toJSON prototype, that will be used to get the
	 *            representation. Non-integer/string keys are skipped in the
	 *            object, as are keys that point to a function.
	 */
	$.toJSON = typeof JSON === 'object' && JSON.stringify ? JSON.stringify : function(o)
	{

		if (o === null)
		{
			return 'null';
		}

		var type = typeof o;

		if (type === 'undefined')
		{
			return undefined;
		}
		if (type === 'number' || type === 'boolean')
		{
			return '' + o;
		}
		if (type === 'string')
		{
			return $.quoteString(o);
		}
		if (type === 'object')
		{
			if (typeof o.toJSON === 'function')
			{
				return $.toJSON(o.toJSON());
			}
			if (o.constructor === Date)
			{
				var month = o.getUTCMonth() + 1,
					day = o.getUTCDate(),
					year = o.getUTCFullYear(),
					hours = o.getUTCHours(),
					minutes = o.getUTCMinutes(),
					seconds = o.getUTCSeconds(),
					milli = o.getUTCMilliseconds();

				if (month < 10)
				{
					month = '0' + month;
				}
				if (day < 10)
				{
					day = '0' + day;
				}
				if (hours < 10)
				{
					hours = '0' + hours;
				}
				if (minutes < 10)
				{
					minutes = '0' + minutes;
				}
				if (seconds < 10)
				{
					seconds = '0' + seconds;
				}
				if (milli < 100)
				{
					milli = '0' + milli;
				}
				if (milli < 10)
				{
					milli = '0' + milli;
				}
				return '"' + year + '-' + month + '-' + day + 'T' + hours + ':' + minutes + ':' + seconds + '.' + milli
					+ 'Z"';
			}
			if (o.constructor === Array)
			{
				var ret = [];
				for (var i = 0; i < o.length; i++)
				{
					ret.push($.toJSON(o[i]) || 'null');
				}
				return '[' + ret.join(',') + ']';
			}
			var name, val,
				pairs = [];
			for (var k in o)
			{
				type = typeof k;
				if (type === 'number')
				{
					name = '"' + k + '"';
				}
				else if (type === 'string')
				{
					name = $.quoteString(k);
				}
				else
				{
					// Keys must be numerical or string. Skip others
					continue;
				}
				type = typeof o[k];

				if (type === 'function' || type === 'undefined')
				{
					// Invalid values like these return undefined
					// from toJSON, however those object members
					// shouldn't be included in the JSON string at all.
					continue;
				}
				val = $.toJSON(o[k]);
				pairs.push(name + ':' + val);
			}
			return '{' + pairs.join(',') + '}';
		}
	};

	/**
	 * jQuery.evalJSON Evaluates a given piece of json source.
	 * 
	 * @param src
	 *            {String}
	 */
	$.evalJSON = typeof JSON === 'object' && JSON.parse ? JSON.parse : function(src)
	{
		return eval('(' + src + ')');
	};

	/**
	 * jQuery.secureEvalJSON Evals JSON in a way that is *more* secure.
	 * 
	 * @param src
	 *            {String}
	 */
	$.secureEvalJSON = typeof JSON === 'object' && JSON.parse ? JSON.parse : function(src)
	{

		var filtered = src.replace(
			/\\["\\\/bfnrtu]/g, '@'
		).replace(
			/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']'
		).replace(
			/(?:^|:|,)(?:\s*\[)+/g, ''
		);

		if (/^[\],:{}\s]*$/.test(filtered))
		{
			return eval('(' + src + ')');
		}
		else
		{
			throw new SyntaxError('Error parsing JSON, source is not valid.');
		}
	};

	/**
	 * jQuery.quoteString Returns a string-repr of a string, escaping quotes
	 * intelligently. Mostly a support function for toJSON. Examples: >>>
	 * jQuery.quoteString('apple') "apple" >>> jQuery.quoteString('"Where are we
	 * going?", she asked.') "\"Where are we going?\", she asked."
	 */
	$.quoteString = function(string)
	{
		if (string.match(escapeable))
		{
			return '"' + string.replace(
				escapeable, function(a)
				{
					var c = meta[a];
					if (typeof c === 'string')
					{
						return c;
					}
					c = a.charCodeAt();
					return '\\u00' + Math.floor(c / 16).toString(16) + (c % 16).toString(16);
				}
			) + '"';
		}
		return '"' + string + '"';
	};

})(jQuery);
