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<?php declare(strict_types = 1);
namespace PHPStan\PhpDocParser\Ast;
/**
* Inspired by https://github.com/nikic/PHP-Parser/tree/36a6dcd04e7b0285e8f0868f44bd4927802f7df1
*
* Copyright (c) 2011, Nikita Popov
* All rights reserved.
*/
interface NodeVisitor
{
/**
* Called once before traversal.
*
* Return value semantics:
* * null: $nodes stays as-is
* * otherwise: $nodes is set to the return value
*
* @param Node[] $nodes Array of nodes
*
* @return Node[]|null Array of nodes
*/
public function beforeTraverse(array $nodes): ?array;
/**
* Called when entering a node.
*
* Return value semantics:
* * null
* => $node stays as-is
* * array (of Nodes)
* => The return value is merged into the parent array (at the position of the $node)
* * NodeTraverser::REMOVE_NODE
* => $node is removed from the parent array
* * NodeTraverser::DONT_TRAVERSE_CHILDREN
* => Children of $node are not traversed. $node stays as-is
* * NodeTraverser::DONT_TRAVERSE_CURRENT_AND_CHILDREN
* => Further visitors for the current node are skipped, and its children are not
* traversed. $node stays as-is.
* * NodeTraverser::STOP_TRAVERSAL
* => Traversal is aborted. $node stays as-is
* * otherwise
* => $node is set to the return value
*
* @param Node $node Node
*
* @return Node|Node[]|NodeTraverser::*|null Replacement node (or special return value)
*/
public function enterNode(Node $node);
/**
* Called when leaving a node.
*
* Return value semantics:
* * null
* => $node stays as-is
* * NodeTraverser::REMOVE_NODE
* => $node is removed from the parent array
* * NodeTraverser::STOP_TRAVERSAL
* => Traversal is aborted. $node stays as-is
* * array (of Nodes)
* => The return value is merged into the parent array (at the position of the $node)
* * otherwise
* => $node is set to the return value
*
* @param Node $node Node
*
* @return Node|Node[]|NodeTraverser::REMOVE_NODE|NodeTraverser::STOP_TRAVERSAL|null Replacement node (or special return value)
*/
public function leaveNode(Node $node);
/**
* Called once after traversal.
*
* Return value semantics:
* * null: $nodes stays as-is
* * otherwise: $nodes is set to the return value
*
* @param Node[] $nodes Array of nodes
*
* @return Node[]|null Array of nodes
*/
public function afterTraverse(array $nodes): ?array;
}
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