FOF30\Less\Parser\Parser::guards PHP Метод

    protected function guards(&$guards)
    {
        $s = $this->seek();
        if (!$this->literal("when")) {
            $this->seek($s);
            return false;
        }
        $guards = array();
        while ($this->guardGroup($g)) {
            $guards[] = $g;
            if (!$this->literal(",")) {
                break;
            }
        }
        if (count($guards) == 0) {
            $guards = null;
            $this->seek($s);
            return false;
        }
        return true;
    }