Leafo\ScssPhp\Parser::argValue PHP Метод

    protected function argValue(&$out)
    {
        $s = $this->seek();
        $keyword = null;
        if (!$this->variable($keyword) || !$this->literal(':')) {
            $this->seek($s);
            $keyword = null;
        }
        if ($this->genericList($value, 'expression')) {
            $out = [$keyword, $value, false];
            $s = $this->seek();
            if ($this->literal('...')) {
                $out[2] = true;
            } else {
                $this->seek($s);
            }
            return true;
        }
        return false;
    }