/*
 * metadata - jquery plugin for parsing metadata from elements
 *
 * copyright (c) 2006 john resig, yehuda katz, j锟矫秗n 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: $id$
 *
 */

/**
 * sets the type of metadata to use. metadata is encoded in json, and each property
 * in the json will become a property of the element itself.
 *
 * there are three supported types of metadata storage:
 *
 *   attr:  inside an attribute. the name parameter indicates *which* attribute.
 *          
 *   class: inside the class attribute, wrapped in curly braces: { }
 *   
 *   elem:  inside a child element (e.g. a script tag). the
 *          name parameter indicates *which* element.
 *          
 * the metadata for an element is loaded the first time the element is accessed via jquery.
 *
 * as a result, you can define the metadata type, use $(expr) to load the metadata into the elements
 * matched by expr, then redefine the metadata type and run another $(expr) for other elements.
 * 
 * @name $.metadata.settype
 *
 * @example <p id="one" class="some_class {item_id: 1, item_label: 'label'}">this is a p</p>
 * @before $.metadata.settype("class")
 * @after $("#one").metadata().item_id == 1; $("#one").metadata().item_label == "label"
 * @desc reads metadata from the class attribute
 * 
 * @example <p id="one" class="some_class" data="{item_id: 1, item_label: 'label'}">this is a p</p>
 * @before $.metadata.settype("attr", "data")
 * @after $("#one").metadata().item_id == 1; $("#one").metadata().item_label == "label"
 * @desc reads metadata from a "data" attribute
 * 
 * @example <p id="one" class="some_class"><script>{item_id: 1, item_label: 'label'}</script>this is a p</p>
 * @before $.metadata.settype("elem", "script")
 * @after $("#one").metadata().item_id == 1; $("#one").metadata().item_label == "label"
 * @desc reads metadata from a nested script element
 * 
 * @param string type the encoding type
 * @param string name the name of the attribute to be used to get metadata (optional)
 * @cat plugins/metadata
 * @descr sets the type of encoding to be used when loading metadata for the first time
 * @type undefined
 * @see metadata()
 */

(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);