Leafo\ScssPhp\Parser::unit PHP Method

    protected function unit(&$unit)
    {
        if ($this->match('([0-9]*(\\.)?[0-9]+)([%a-zA-Z]+)?', $m)) {
            $unit = new Node\Number($m[1], empty($m[3]) ? '' : $m[3]);
            return true;
        }
        return false;
    }