Leafo\ScssPhp\Parser::mixedKeyword PHP Method

    protected function mixedKeyword(&$out)
    {
        $parts = [];
        $oldWhite = $this->eatWhiteDefault;
        $this->eatWhiteDefault = false;
        for (;;) {
            if ($this->keyword($key)) {
                $parts[] = $key;
                continue;
            }
            if ($this->interpolation($inter)) {
                $parts[] = $inter;
                continue;
            }
            break;
        }
        $this->eatWhiteDefault = $oldWhite;
        if (count($parts) === 0) {
            return false;
        }
        if ($this->eatWhiteDefault) {
            $this->whitespace();
        }
        $out = $parts;
        return true;
    }