protected function singleLineComment()
    {
        $comment = '';
        while (true) {
            $get = $this->get();
            $comment .= $get;
            if (ord($get) <= self::ORD_LF) {
                if (preg_match('/^\\/@(?:cc_on|if|elif|else|end)\\b/', $comment)) {
                    return '/'.$comment;
                }
                return $get;
            }
        }
        return;
    }