public function selector2xpath($selector)
    {
        $parts = preg_split('/\\s+/', $selector);
        $xpath = "";
        foreach ($parts as $part) {
            if (preg_match('/^([A-Za-z][A-Za-z0-9]*)/', $part, $matches)) {
                $xpath .= "//$matches[1]";
            } else {
                $xpath .= "//*";
            }
            $xfilters = array();
            if (preg_match('/#([^#.\[]+)/', $part, $matches)) {
                $xfilters[] = "@id='$matches[1]'";
            }
            if (preg_match('/\.([^#.\[]+)/', $part, $matches)) {
                $xfilters[] = "contains(@class,'$matches[1]')";
            }
            if ($xfilters) {
                $xpath .= '[' . implode(',', $xfilters) . ']';
            }
        }
        return $xpath;
    }