private function blockVar($nodes, $id, $start, $end, $otag, $ctag, $level)
    {
        $id = var_export($id, true);

        $else = $this->walk($nodes, $level);
        if ($else !== '') {
            $else = sprintf($this->prepare(self::BLOCK_VAR_ELSE, $level + 1, false, true), $else);
        }

        return sprintf($this->prepare(self::BLOCK_VAR, $level), $id, $else);
    }