/*
 * 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);