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