public function get($key, $default = null)
    {
        if (empty($key)) {
            return $default;
        }

        $parts = explode(".", $key);
        $file = array_shift($parts);

        if (!isset($this->registry[$file])) {
            $this->registry[$file] = $this->discover($file);
        }
        $res = $this->parse($key);

        return is_null($res) ? $default : $res;
    }