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<?php declare(strict_types=1);
namespace PhpParser\NodeVisitor;
use PhpParser\Node;
use PhpParser\NodeVisitorAbstract;
/**
* Visitor that connects a child node to its parent node
* as well as its sibling nodes.
*
* With <code>$weakReferences=false</code> on the child node, the parent node can be accessed through
* <code>$node->getAttribute('parent')</code>, the previous
* node can be accessed through <code>$node->getAttribute('previous')</code>,
* and the next node can be accessed through <code>$node->getAttribute('next')</code>.
*
* With <code>$weakReferences=true</code> attribute names are prefixed by "weak_", e.g. "weak_parent".
*/
final class NodeConnectingVisitor extends NodeVisitorAbstract {
/**
* @var Node[]
*/
private array $stack = [];
/**
* @var ?Node
*/
private $previous;
private bool $weakReferences;
public function __construct(bool $weakReferences = false) {
$this->weakReferences = $weakReferences;
}
public function beforeTraverse(array $nodes) {
$this->stack = [];
$this->previous = null;
}
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', $parent);
}
}
if ($this->previous !== null) {
if (
$this->weakReferences
) {
if ($this->previous->getAttribute('weak_parent') === $node->getAttribute('weak_parent')) {
$node->setAttribute('weak_previous', \WeakReference::create($this->previous));
$this->previous->setAttribute('weak_next', \WeakReference::create($node));
}
} elseif ($this->previous->getAttribute('parent') === $node->getAttribute('parent')) {
$node->setAttribute('previous', $this->previous);
$this->previous->setAttribute('next', $node);
}
}
$this->stack[] = $node;
}
public function leaveNode(Node $node) {
$this->previous = $node;
array_pop($this->stack);
}
}
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