PhpCss\Ast\Selector\Simple\PseudoClass::accept PHP Method

    public function accept(Ast\Visitor $visitor)
    {
        if ($this->parameter instanceof Ast) {
            if ($visitor->visitEnter($this)) {
                $this->parameter->accept($visitor);
                $visitor->visitLeave($this);
            }
        } else {
            $visitor->visit($this);
        }
    }