protected function include( Line$line ):self
	{
		$inclued= (new static($this->htsl,$this->buffer->goSide($line->pregGet('/(?<=\( ).*(?= \))/')),$this))->execute()->content??null;

		false===$this->indentation or $inclued= $this->insertIndentations($inclued);

		return $this->openNode(new StringNode($this,$line))->append($inclued);
	}