private function _parse_variable_to()
    {
        $parts = explode('#', $this->_to);
        empty($parts[1]) && $parts[1] = 'index';
        
        $part = is_int(strpos($parts[0], ':')) ? $parts[0] : $parts[1];
        
        preg_match('/:(\w+)/', $part, $m);
        $type = $m[1];
        
        return $type;
    }