public static function filterMarkdown(Node $node, $indent, $newLine)
    {

        if (!class_exists('Parsedown'))
            throw new Compiler\Exception(
                "Failed to compile Markdown: "
                ."Please install the erusev/parsedown composer package"
            );

        $parsedown = new \Parsedown();

        return $parsedown->text($node->text());
    }