/*
 * Metadata - jQuery plugin for parsing metadata from elements
 *
 * Copyright (c) 2006 John Resig, Yehuda Katz, J�örn Zaefferer, Paul McLanahan
 *
 * Dual licensed under the MIT and GPL licenses:
 *   http://www.opensource.org/licenses/mit-license.php
 *   http://www.gnu.org/licenses/gpl.html
 *
 * Revision: $Id: jquery.metadata.js 3640 2007-10-11 18:34:38Z pmclanahan $
 *
 */

(function($) {

$.extend({
  metadata : {
    defaults : {
      type: 'class',
      name: 'metadata',
      cre: /({.*})/,
      single: 'metadata'
    },
    setType: function( type, name ){
      this.defaults.type = type;
      this.defaults.name = name;
    },
    get: function( elem, opts ){
      var settings = $.extend({},this.defaults,opts);
      // check for empty string in single property
      if ( !settings.single.length ) settings.single = 'metadata';
      
      var data = $.data(elem, settings.single);
      // returned cached data if it already exists
      if ( data ) return data;
      
      data = "{}";
      
      var getData = function(data) {
        if(typeof data != "string") return data;
        
        if( data.indexOf('{') < 0 ) {
          data = eval("(" + data + ")");
        }
      }
      
      var getObject = function(data) {
        if(typeof data != "string") return data;
        
        data = eval("(" + data + ")");
        return data;
      }
      
      if ( settings.type == "html5" ) {
        var object = {};
        $( elem.attributes ).each(function() {
          var name = this.nodeName;
          if(name.match(/^data-/)) name = name.replace(/^data-/, '');
          else return true;
          object[name] = getObject(this.nodeValue);
        });
      } else {
        if ( settings.type == "class" ) {
          var m = settings.cre.exec( elem.className );
          if ( m )
            data = m[1];
        } else if ( settings.type == "elem" ) {
          if( !elem.getElementsByTagName ) return;
          var e = elem.getElementsByTagName(settings.name);
          if ( e.length )
            data = $.trim(e[0].innerHTML);
        } else if ( elem.getAttribute != undefined ) {
          var attr = elem.getAttribute( settings.name );
          if ( attr )
            data = attr;
        }
        object = getObject(data.indexOf("{") < 0 ? "{" + data + "}" : data);
      }
      
      $.data( elem, settings.single, object );
      return object;
    }
  }
});

/**
 * Returns the metadata object for the first member of the jQuery object.
 *
 * @name metadata
 * @descr Returns element's metadata object
 * @param Object opts An object contianing settings to override the defaults
 * @type jQuery
 * @cat Plugins/Metadata
 */
$.fn.metadata = function( opts ){
  return $.metadata.get( this[0], opts );
};

})(jQuery);