public function parseFilteredValue() {
        list($type, $filters) = $this->pop('FILTERED_VALUE');
        $value = array_shift($filters);
        $opening = '';
        $closing = '';

        foreach($filters as $filter) {
            if(function_exists($filter)) {
                $opening .= $filter . '(';
                $closing .= ')';
            } else {
                $opening .= '\Katar\Katar::getInstance()->filter(\'' .
                    $filter . '\', ';
                $closing .= ')';
            }
        }

        return '$output .= ' . $opening . $value . $closing . ";\n";
    }