private static function splAutoloader($class_name) {
        if('Treffynnon\\Navigator' === substr(ltrim($class_name, '\\'), 0, 20)) {
            $class_path = realpath(__DIR__ . '/..') . '/' . str_replace('\\', DIRECTORY_SEPARATOR, $class_name);
            require_once $class_path . '.php';
        }
    }