Document::proxyAction

private function proxyAction(string $action, array $arguments = [])
{
	$controller = $this->getDocumentGeneratorController();
	$controller->setScope($this->getScope());
	$result = call_user_func_array([$controller, $action], $arguments);
	$this->errorCollection->add($controller->getErrors());

	return ($result === false) ? null : $result;
}