<?php declare(strict_types=1);
namespace PhpParser\NodeVisitor;
use PhpParser\Node;
use PhpParser\NodeVisitorAbstract;
/**
* This visitor can be used to find and collect all nodes satisfying some criterion determined by
* a filter callback.
*/
class FindingVisitor extends NodeVisitorAbstract
{
/** @var callable Filter callback */
protected $filterCallback;
/** @var Node[] Found nodes */
protected $foundNodes;
public function __construct(callable $filterCallback) {
$this->filterCallback = $filterCallback;
}
/**
* Get found nodes satisfying the filter callback.
*
* Nodes are returned in pre-order.
*
* @return Node[] Found nodes
*/
public function getFoundNodes() : array {
return $this->foundNodes;
}
public function beforeTraverse(array $nodes) {
$this->foundNodes = [];
return null;
}
public function enterNode(Node $node) {
$filterCallback = $this->filterCallback;
if ($filterCallback($node)) {
$this->foundNodes[] = $node;
}
return null;
}
}