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<?php /** * Copyright (c) 2013-2023 Nicolò Martini * * For the full copyright and license information, please view * the LICENSE.md file that was distributed with this source code. * * @see https://github.com/nicmart/Tree */ namespace Tree\Visitor; use Tree\Node\NodeInterface; class YieldVisitor implements Visitor { /** * @return array<int, NodeInterface> */ public function visit(NodeInterface $node): mixed { if ($node->isLeaf()) { return [$node]; } $yield = []; foreach ($node->getChildren() as $child) { $yield = \array_merge($yield, $child->accept($this)); } return $yield; } }