Leafo\ScssPhp\Parser::genericList PHP Method

    protected function genericList(&$out, $parseItem, $delim = '', $flatten = true)
    {
        $s = $this->seek();
        $items = [];
        while ($this->{$parseItem}($value)) {
            $items[] = $value;
            if ($delim) {
                if (!$this->literal($delim)) {
                    break;
                }
            }
        }
        if (count($items) === 0) {
            $this->seek($s);
            return false;
        }
        if ($flatten && count($items) === 1) {
            $out = $items[0];
        } else {
            $out = [Type::T_LIST, $delim, $items];
        }
        return true;
    }