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/*

 * jQuery JSON Plugin

 * version: 2.1 (2009-08-14)

 *

 * 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($) {

    /** jQuery.toJSON( 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.

     **/

    $.toJSON = 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 $.quoteString(o);

        if (type == 'object')

        {

            if (typeof o.toJSON == "function") 

                return $.toJSON( 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( $.toJSON(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 = $.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 = $.toJSON(o[k]);

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

            }

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

        }

    };

    /** jQuery.evalJSON(src)

        Evaluates a given piece of json source.

     **/

    $.evalJSON = function(src)

    {

        if (typeof(JSON) == 'object' && JSON.parse)

            return JSON.parse(src);

        return eval("(" + src + ")");

    };

    /** jQuery.secureEvalJSON(src)

        Evals JSON in a way that is *more* secure.

    **/

    $.secureEvalJSON = 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.quoteString(string)

        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 + '"';

    };

    var _escapeable = /["\\\x00-\x1f\x7f-\x9f]/g;

    var _meta = {

        '\b': '\\b',

        '\t': '\\t',

        '\n': '\\n',

        '\f': '\\f',

        '\r': '\\r',

        '"' : '\\"',

        '\\': '\\\\'

    };

})(jQuery);