/*
 * This document is licensed as free software under the terms of the
 * MIT License: <A title=http://www.opensource.org/licenses/mit-license.php href="http://www.opensource.org/licenses/mit-license.php">http://www.opensource.org/licenses/mit-license.php</A>
 *
 * Adapted by Rahul Singla.
 *
 * Brantley Harris wrote this plugin. It is based somewhat on the JSON.org 
 * website's <A title=http://www.json.org/json2.js href="http://www.json.org/json2.js">http://www.json.org/json2.js</A>, 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.
 */

/**
 * jQuery.JSON.encode( json-serializble ) Converts the given argument into a
 * JSON respresentation.
 * 
 * If an object has a "toJSON" function, 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.
 * 
 * json-serializble: The *thing* to be converted.
 *
 * Example:
 *	var thing = {plugin: 'jquery-json', other: "blah-blah"};
 *	var encoded = $.JSON.encode(thing);
 *	var decoded = $.JSON.decode(encoded);
 *
 */
jQuery.JSON = {
	encode: function(o) {
		if (typeof (JSON) == 'object' && JSON.stringify)
			return JSON.stringify(o);

		var type = typeof (o);

		if (o === null)
			return "null";

		if (type == "undefined")
			return undefined;

		if (type == "number" || type == "boolean")
			return o + "";

		if (type == "string")
			return this.quoteString(o);

		if (type == 'object') {
			if (typeof o.toJSON == "function")
				return this.encode(o.toJSON());

			if (o.constructor === Date) {
				var month = o.getUTCMonth() + 1;
				if (month < 10)
					month = '0' + month;

				var day = o.getUTCDate();
				if (day < 10)
					day = '0' + day;

				var year = o.getUTCFullYear();

				var hours = o.getUTCHours();
				if (hours < 10)
					hours = '0' + hours;

				var minutes = o.getUTCMinutes();
				if (minutes < 10)
					minutes = '0' + minutes;

				var seconds = o.getUTCSeconds();
				if (seconds < 10)
					seconds = '0' + seconds;

				var milli = o.getUTCMilliseconds();
				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(this.encode(o[i]) || "null");

				return "[" + ret.join(",") + "]";
			}

			var pairs = [];
			for ( var k in o) {
				var name;
				var type = typeof k;

				if (type == "number")
					name = '"' + k + '"';
				else if (type == "string")
					name = this.quoteString(k);
				else
					continue; // skip non-string or number keys

				if (typeof o[k] == "function")
					continue; // skip pairs where the value is a function.

				var val = this.encode(o[k]);

				pairs.push(name + ":" + val);
			}

			return "{" + pairs.join(", ") + "}";
		}
	},

	/**
	 * jQuery.JSON.decode(src) Evaluates a given piece of json source.
	 */
	decode: function(src) {
		if (typeof (JSON) == 'object' && JSON.parse)
			return JSON.parse(src);
		return eval("(" + src + ")");
	},

	/**
	 * jQuery.JSON.decodeSecure(src) Evals JSON in a way that is *more* secure.
	 */
	decodeSecure: function(src) {
		if (typeof (JSON) == 'object' && JSON.parse)
			return JSON.parse(src);

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

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

	/**
	 * jQuery.JSON.quoteString(string) Returns a string-repr of a string, escaping
	 * quotes intelligently. Mostly a support function for JSON.encode.
	 * 
	 * Examples: >>> jQuery.JSON.quoteString("apple") "apple"
	 * 
	 * >>> jQuery.JSON.quoteString('"Where are we going?", she asked.') "\"Where
	 * are we going?\", she asked."
	 */
	quoteString: function(string) {
		if (string.match(this._escapeable)) {
			return '"' + string.replace(this._escapeable, function(a) {
				var c = this._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 + '"';
	},

	_escapeable: /["\\\x00-\x1f\x7f-\x9f]/g,

	_meta: {
		'\b': '\\b',
		'\t': '\\t',
		'\n': '\\n',
		'\f': '\\f',
		'\r': '\\r',
		'"': '\\"',
		'\\': '\\\\'
	}
}