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Frequently Asked Questions
==========================
* [How can the parent of a node be obtained?](#how-can-the-parent-of-a-node-be-obtained)
* [How can the next/previous sibling of a node be obtained?](#how-can-the-nextprevious-sibling-of-a-node-be-obtained)
How can the parent of a node be obtained?
-----
The AST does not store parent nodes by default. However, it is easy to add a custom parent node
attribute using a custom node visitor:
```php
use PhpParser\Node;
use PhpParser\NodeVisitorAbstract;
class ParentConnector extends NodeVisitorAbstract {
private $stack;
public function beforeTraverse(array $nodes) {
$this->stack = [];
}
public function enterNode(Node $node) {
if (!empty($this->stack)) {
$node->setAttribute('parent', $this->stack[count($this->stack)-1]);
}
$this->stack[] = $node;
}
public function leaveNode(Node $node) {
array_pop($this->stack);
}
}
```
After running this visitor, the parent node can be obtained through `$node->getAttribute('parent')`.
How can the next/previous sibling of a node be obtained?
-----
Again, siblings are not stored by default, but the visitor from the previous entry can be easily
extended to store the previous / next node with a common parent as well:
```php
use PhpParser\Node;
use PhpParser\NodeVisitorAbstract;
class NodeConnector extends NodeVisitorAbstract {
private $stack;
private $prev;
public function beforeTraverse(array $nodes) {
$this->stack = [];
$this->prev = null;
}
public function enterNode(Node $node) {
if (!empty($this->stack)) {
$node->setAttribute('parent', $this->stack[count($this->stack)-1]);
}
if ($this->prev && $this->prev->getAttribute('parent') == $node->getAttribute('parent')) {
$node->setAttribute('prev', $this->prev);
$this->prev->setAttribute('next', $node);
}
$this->stack[] = $node;
}
public function leaveNode(Node $node) {
$this->prev = $node;
array_pop($this->stack);
}
}
```