Leafo\ScssPhp\Parser::stripAssignmentFlags PHP Method

    protected function stripAssignmentFlags(&$value)
    {
        $flags = [];
        for ($token =& $value; $token[0] === Type::T_LIST && ($s = count($token[2])); $token =& $lastNode) {
            $lastNode =& $token[2][$s - 1];
            while ($lastNode[0] === Type::T_KEYWORD && in_array($lastNode[1], ['!default', '!global'])) {
                array_pop($token[2]);
                $node = end($token[2]);
                $token = $this->flattenList($token);
                $flags[] = $lastNode[1];
                $lastNode = $node;
            }
        }
        return $flags;
    }