Leafo\ScssPhp\Parser::map PHP Method

    protected function map(&$out)
    {
        $s = $this->seek();
        if (!$this->literal('(')) {
            return false;
        }
        $keys = [];
        $values = [];
        while ($this->genericList($key, 'expression') && $this->literal(':') && $this->genericList($value, 'expression')) {
            $keys[] = $key;
            $values[] = $value;
            if (!$this->literal(',')) {
                break;
            }
        }
        if (!count($keys) || !$this->literal(')')) {
            $this->seek($s);
            return false;
        }
        $out = [Type::T_MAP, $keys, $values];
        return true;
    }