Leafo\ScssPhp\Parser::__construct PHP Method

    public function __construct($sourceName, $sourceIndex = 0, $encoding = 'utf-8')
    {
        $this->sourceName = $sourceName ?: '(stdin)';
        $this->sourceIndex = $sourceIndex;
        $this->charset = null;
        $this->utf8 = !$encoding || strtolower($encoding) === 'utf-8';
        $this->patternModifiers = $this->utf8 ? 'Aisu' : 'Ais';
        if (empty(static::$operatorPattern)) {
            static::$operatorPattern = '([*\\/%+-]|[!=]\\=|\\>\\=?|\\<\\=\\>|\\<\\=?|and|or)';
            $commentSingle = '\\/\\/';
            $commentMultiLeft = '\\/\\*';
            $commentMultiRight = '\\*\\/';
            static::$commentPattern = $commentMultiLeft . '.*?' . $commentMultiRight;
            static::$whitePattern = $this->utf8 ? '/' . $commentSingle . '[^\\n]*\\s*|(' . static::$commentPattern . ')\\s*|\\s+/AisuS' : '/' . $commentSingle . '[^\\n]*\\s*|(' . static::$commentPattern . ')\\s*|\\s+/AisS';
        }
    }

 function __construct($sourceName, $sourceIndex = 0, $encoding = 'utf-8', $scssFile = null)
 {
     $this->scssFile = $scssFile;
     parent::__construct($sourceName, $sourceIndex, $encoding);
 }