*/ private \WeakMap $cache; /** * @var iterable */ private iterable $voters; /** * @param iterable $voters */ public function __construct(iterable $voters = []) { $this->voters = $voters; $this->cache = new \WeakMap(); } public function isCurrent(ItemInterface $item): bool { $current = $item->isCurrent(); if (null !== $current) { return $current; } if ($this->cache->offsetExists($item)) { return $this->cache[$item]; } foreach ($this->voters as $voter) { $current = $voter->matchItem($item); if (null !== $current) { break; } } $current = (bool) $current; $this->cache[$item] = $current; return $current; } public function isAncestor(ItemInterface $item, ?int $depth = null): bool { if (0 === $depth) { return false; } $childDepth = null === $depth ? null : $depth - 1; foreach ($item->getChildren() as $child) { if ($this->isCurrent($child) || $this->isAncestor($child, $childDepth)) { return true; } } return false; } public function clear(): void { $this->cache = new \WeakMap(); } }