//>>excludeStart("exclude", pragmas.exclude);
define([ "shoestring" ], function(){
//>>excludeEnd("exclude");

	(function() {
		function _getIndex( set, test ) {
			var i, result, element;

			for( i = result = 0; i < set.length; i++ ) {
				element = set.item ? set.item(i) : set[i];

				if( test(element) ){
					return result;
				}

				// ignore text nodes, etc
				// NOTE may need to be more permissive
				if( element.nodeType === 1 ){
					result++;
				}
			}

			return -1;
		}

		/**
		 * Find the index in the current set for the passed selector.
		 * Without a selector it returns the index of the first node within the array of its siblings.
		 *
		 * @param {string|undefined} selector The selector used to search for the index.
		 * @return {integer}
		 * @this {shoestring}
		 */
		shoestring.fn.index = function( selector ){
			var self, children;

			self = this;

			// no arg? check the children, otherwise check each element that matches
			if( selector === undefined ){
				children = ( ( this[ 0 ] && this[0].parentNode ) || doc.documentElement).childNodes;

				// check if the element matches the first of the set
				return _getIndex(children, function( element ) {
					return self[0] === element;
				});
			} else {
//>>includeStart("development", pragmas.development);
				if( selector.constructor === shoestring.Shoestring ) {
					shoestring.error( "index-shoestring-object" );
				}
//>>includeEnd("development");

				// check if the element matches the first selected node from the parent
				return _getIndex(self, function( element ) {
					return element === (shoestring( selector, element.parentNode )[ 0 ]);
				});
			}
		};
	})();

//>>excludeStart("exclude", pragmas.exclude);
});
//>>excludeEnd("exclude");