public function smartModifiersFilter(MacroTokens $tokens)
    {
        $inside = NULL;
        $brackets = array();
        $res = new MacroTokens;
        while ($tokens->nextToken()) {
            if ($tokens->isCurrent('(')) {
                $brackets[] = $res->position;

            } elseif ($tokens->isCurrent(')')) {
                if (array_pop($brackets) === $inside) {
                    $res->append(')');
                }

            } elseif ($tokens->isCurrent('|')) {
                if ($inside === end($brackets)) {
                    $res->append(')');
                }
                $name = $tokens->nextValue(MacroTokens::T_SYMBOL);
                if ($name === 'escape') {
                    $res = $this->escapeFilter($res, end($brackets));
                    $tokens->nextToken(')');
                    $inside = NULL;
                    continue;
                }

                $res->append('$template->' . $name . '(', end($brackets));
                $tokens->nextToken(',', ':');
                if ($tokens->isNext() && !$tokens->isNext(')', '|')) {
                    $res->append(',');
                }
                $inside = end($brackets);
                continue;

            } elseif ($tokens->isCurrent(':') && $inside === end($brackets)) {
                $res->append(',');
                continue;
            }

            $res->append($tokens->currentToken());
        }

        if ($inside !== NULL) {
            $res->append(')');
        }
        return $res;
    }