/**
* @param Delimiter $delimiter
*/
public function removeDelimiter(Delimiter $delimiter)
{
if ($delimiter->getPrevious() !== null) {
$delimiter->getPrevious()->setNext($delimiter->getNext());
}
if ($delimiter->getNext() === null) {
// top of stack
$this->top = $delimiter->getPrevious();
} else {
$delimiter->getNext()->setPrevious($delimiter->getPrevious());
}
}
/**
* @param Delimiter $closer
* @param array $openersBottom
* @param Delimiter|null $stackBottom
*
* @return Delimiter|null
*/
protected function findFirstMatchingOpener(Delimiter $closer, $openersBottom, Delimiter $stackBottom = null)
{
$closerChar = $closer->getChar();
$opener = $closer->getPrevious();
while ($opener !== null && $opener !== $stackBottom && $opener !== $openersBottom[$closerChar]) {
if ($opener->getChar() === $closerChar && $opener->canOpen()) {
return $opener;
}
$opener = $opener->getPrevious();
}
}
