[jQuery] Trace path to a node

trace.js

(function( $ ){
	jQuery.fn.trace = function () {
		if (this.length != 1)
			return '';
		var path, node = this;
		while (node.length) {
			var realNode = node[0], name = realNode.localName;
			if (!name) break;

			name = name.toLowerCase();
			if (realNode.id) {
				return name + '#' + realNode.id + (path ? '>' + path : '');
			} else if (realNode.className) {
				name += '.' + realNode.className.split(/\s+/).join('.');
			}

			var parent = node.parent(), siblings = parent.children(name);
			if (siblings.length > 1) name += ':eq(' + siblings.index(node) + ')';
			path = name + (path ? '>' + path : '');
			node = parent;
		}
		return path;
	};
})( jQuery );