625      * @param string $filename file path label
628     public function file($text, $language = null, $filename = null, $options = null)  argument
630         $this->_highlight('file', $text, $language, $filename, $options);
638      * @param string $filename file path label
641     public function code($text, $language = null, $filename = null, $options = null)  argument
643         $this->_highlight('code', $text, $language, $filename, $options);
652      * @param string $filename file path label
656     public function _highlight($type, $text, $language = null, $filename = null, $options = null)  argument
664         if ($filename) {
666             [$ext] = mimetype($filename, false);
681             $this->doc .= hsc($filename);
703         if ($filename) {