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

        if (!class_exists('lessc'))
            throw new Compiler\Exception(
                "Failed to compile LESS: "
                ."Please install the leafo/lessphp composer package"
            );

        $less = new \lessc;
        $css = $less->compile($node->text());

        return '<style>'.$newLine.$indent.$css.$newLine.$indent.'</style>';
    }