/**
* @param Optional $expression
*
* @return boolean
*/
public function endVisitOptional(Optional $expression)
{
/** @var Expression[]|array $children */
$children = array_pop($this->stackOfChildren);
$optionalExpression = array_pop($children);
$newNonTerminal = $this->createNewNonTerminal();
$expression = ExpressionSymbol::createAdapterForSymbol($newNonTerminal);
$this->setAsRootOrAddSibling($expression);
$this->addEpsilonAlternativeForItem($newNonTerminal, $optionalExpression);
}
