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<?php declare(strict_types=1);
namespace PhpParser\NodeVisitor;
use PhpParser\Node;
use PhpParser\NodeVisitorAbstract;
use function array_pop;
use function count;
/**
* Visitor that connects a child node to its parent node.
*
* With <code>$weakReferences=false</code> on the child node, the parent node can be accessed through
* <code>$node->getAttribute('parent')</code>.
*
* With <code>$weakReferences=true</code> the attribute name is "weak_parent" instead.
*/
final class ParentConnectingVisitor extends NodeVisitorAbstract {
/**
* @var Node[]
*/
private array $stack = [];
private bool $weakReferences;
public function __construct(bool $weakReferences = false) {
$this->weakReferences = $weakReferences;
}
public function beforeTraverse(array $nodes) {
$this->stack = [];
}
public function enterNode(Node $node) {
if (!empty($this->stack)) {
$parent = $this->stack[count($this->stack) - 1];
if ($this->weakReferences) {
$node->setAttribute('weak_parent', \WeakReference::create($parent));
} else {
$node->setAttribute('parent', $parent);
}
}
$this->stack[] = $node;
}
public function leaveNode(Node $node) {
array_pop($this->stack);
}
}
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