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<?php declare(strict_types=1); |
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|
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namespace PhpParser\NodeVisitor; |
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|
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use PhpParser\Node; |
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use PhpParser\NodeTraverser; |
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use PhpParser\NodeVisitorAbstract; |
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|
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/** |
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* This visitor can be used to find the first node satisfying some criterion determined by |
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* a filter callback. |
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*/ |
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class FirstFindingVisitor extends NodeVisitorAbstract |
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{ |
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/** @var callable Filter callback */ |
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protected $filterCallback; |
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/** @var null|Node Found node */ |
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protected $foundNode; |
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|
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public function __construct(callable $filterCallback) { |
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$this->filterCallback = $filterCallback; |
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} |
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|
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/** |
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* Get found node satisfying the filter callback. |
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* |
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* Returns null if no node satisfies the filter callback. |
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* |
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* @return null|Node Found node (or null if not found) |
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*/ |
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public function getFoundNode() { |
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return $this->foundNode; |
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} |
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|
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public function beforeTraverse(array $nodes) { |
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$this->foundNode = null; |
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|
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return null; |
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} |
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|
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public function enterNode(Node $node) { |
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$filterCallback = $this->filterCallback; |
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if ($filterCallback($node)) { |
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$this->foundNode = $node; |
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return NodeTraverser::STOP_TRAVERSAL; |
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} |
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|
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return null; |
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} |
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} |
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