Leafo\ScssPhp\Compiler::compileWith PHP Method

    private function compileWith($with)
    {
        static $mapping = ['rule' => self::WITH_RULE, 'media' => self::WITH_MEDIA, 'supports' => self::WITH_SUPPORTS, 'all' => self::WITH_ALL];
        // exclude selectors by default
        $without = static::WITH_RULE;
        if ($this->libMapHasKey([$with, static::$with])) {
            $without = static::WITH_ALL;
            $list = $this->coerceList($this->libMapGet([$with, static::$with]));
            foreach ($list[2] as $item) {
                $keyword = $this->compileStringContent($this->coerceString($item));
                if (array_key_exists($keyword, $mapping)) {
                    $without &= ~$mapping[$keyword];
                }
            }
        }
        if ($this->libMapHasKey([$with, static::$without])) {
            $without = 0;
            $list = $this->coerceList($this->libMapGet([$with, static::$without]));
            foreach ($list[2] as $item) {
                $keyword = $this->compileStringContent($this->coerceString($item));
                if (array_key_exists($keyword, $mapping)) {
                    $without |= $mapping[$keyword];
                }
            }
        }
        return $without;
    }