/*
* Metadata - jQuery plugin for parsing metadata from elements
*
* Copyright (c) 2006 John Resig, Yehuda Katz, Jörn 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
*
*/

(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 = "{}";

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 undefined;
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;
}

if ( data.indexOf( '{' ) <0 )
data = "{" + data + "}";

data = eval("(" + data + ")");

$.data( elem, settings.single, data );
return data;
}
}
});

/**
* 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);