/**
* @param BaseControl|Container $formElement
* @return array|\ArrayIterator
* @throws \Kdyby\DoctrineForms\InvalidArgumentException
*/
private static function iterate($formElement)
{
if ($formElement instanceof Container) {
return $formElement->getComponents();
} elseif ($formElement instanceof IControl) {
return array($formElement);
} else {
throw new Kdyby\DoctrineForms\InvalidArgumentException('Expected Nette\\Forms\\Container or Nette\\Forms\\IControl, but ' . get_class($formElement) . ' given');
}
}