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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. * * 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>. */ final class NodeConnectingVisitor extends NodeVisitorAbstract { /** * @var Node[] */ private $stack = []; /** * @var ?Node */ private $previous; public function beforeTraverse(array $nodes) { $this->stack = []; $this->previous = null; } public function enterNode(Node $node) { if (!empty($this->stack)) { $node->setAttribute('parent', $this->stack[count($this->stack) - 1]); } if ($this->previous !== null && $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); } }