/*
 * jQuery JSON Plugin
 * version: 1.0 (2008-04-17)
 *
 * This document is licensed as free software under the terms of the
 * MIT License: http://www.opensource.org/licenses/mit-license.php
 *
 * Brantley Harris technically wrote this plugin, but 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.  I really just cleaned it up.
 *
 * It is also based heavily on MochiKit's serializeJSON, which is 
 * copywrited 2005 by Bob Ippolito.
 */
 
(function($) {   
    function toIntegersAtLease(n) 
    // Format integers to have at least two digits.
    {    
        return n < 10 ? '0' + n : n;
    }

    Date.prototype.toJSON = function(date)
    // Yes, it polutes the Date namespace, but we'll allow it here, as
    // it's damned usefull.
    {
        return this.getUTCFullYear()   + '-' +
             toIntegersAtLease(this.getUTCMonth()) + '-' +
             toIntegersAtLease(this.getUTCDate());
    };

    var escapeable = /["\\\x00-\x1f\x7f-\x9f]/g;
    var meta = {    // table of character substitutions
            '\b': '\\b',
            '\t': '\\t',
            '\n': '\\n',
            '\f': '\\f',
            '\r': '\\r',
            '"' : '\\"',
            '\\': '\\\\'
        };
        
    $.quoteString = function(string)
    // Places quotes around a string, inteligently.
    // If the string contains no control characters, no quote characters, and no
    // backslash characters, then we can safely slap some quotes around it.
    // Otherwise we must also replace the offending characters with safe escape
    // sequences.
    {
        if (escapeable.test(string))
        {
            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 + '"';
    };
    
    $.toJSON = function(o, compact, parented)
    {
      var type = typeof(o);

      if (type == "undefined")
        // return "undefined"; // THIS IS NOT CONFORMANT TO JSON SPEC!!!!
        return (!parented) ? "" : undefined;
      else if (type == "number" || type == "boolean")
        return o + "";
      else if (o === null)
        return "null";

      // Is it a string?
      if (type == "string") 
      {
        return $.quoteString(o);
      }

      // Does it have a .toJSON function?
      if (type == "object" && typeof o.toJSON == "function") 
        return o.toJSON(compact);

      // Is it an array?
      if (type != "function" && typeof(o.length) == "number") 
      {
        var ret = [];
        for (var i = 0; i < o.length; i++) {
          ret.push( $.toJSON(o[i], compact, true) );
        }
        if (compact)
          return "[" + ret.join(",") + "]";
        else
          return "[" + ret.join(", ") + "]";
      }

      // If it's a function, we have to warn somebody!
      if (type == "function") {
        throw new TypeError("Unable to convert object of type 'function' to json.");
      }

      // It's probably an object, then.
      var ret = [];
      for (var k in o) {
        var name;
        type = typeof(k);

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

        var val = $.toJSON(o[k], compact, true);
        if (typeof(val) != "string") {
          // skip non-serializable values
          continue;
        }

        if (compact)
          ret.push(name + ":" + val);
        else
          ret.push(name + ": " + val);
      }
      return "{" + ret.join(", ") + "}";
    };


    
    $.compactJSON = function(o)
    {
        return $.toJSON(o, true);
    };
    
    $.evalJSON = function(src)
    // Evals JSON that we know to be safe.
    {
        return eval("(" + src + ")");
    };
    
    $.secureEvalJSON = function(src)
    // Evals JSON in a way that is *more* secure.
    {
        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);