*/ private array $visitors; /** * @no-named-arguments */ public function __construct(Visitor ... $visitors) { $this->visitors = $visitors; } public function traverse(DOMNode $node): DOMNode { $this->enterNode($node); foreach (attributes_list($node) as $attribute) { $this->traverse($attribute); } foreach (children($node) as $child) { $this->traverse($child); } $this->leaveNode($node); return $node; } private function enterNode(DOMNode $node): void { foreach ($this->visitors as $visitor) { $visitor->onNodeEnter($node)($node); } } private function leaveNode(DOMNode $node): void { foreach ($this->visitors as $visitor) { $visitor->onNodeLeave($node)($node); } } }