관리-도구
편집 파일: NodeVisitor.php
<?php declare(strict_types=1); namespace PhpParser; interface NodeVisitor { /** * If NodeVisitor::enterNode() returns DONT_TRAVERSE_CHILDREN, child nodes * of the current node will not be traversed for any visitors. * * For subsequent visitors enterNode() will still be called on the current * node and leaveNode() will also be invoked for the current node. */ public const DONT_TRAVERSE_CHILDREN = 1; /** * If NodeVisitor::enterNode() or NodeVisitor::leaveNode() returns * STOP_TRAVERSAL, traversal is aborted. * * The afterTraverse() method will still be invoked. */ public const STOP_TRAVERSAL = 2; /** * If NodeVisitor::leaveNode() returns REMOVE_NODE for a node that occurs * in an array, it will be removed from the array. * * For subsequent visitors leaveNode() will still be invoked for the * removed node. */ public const REMOVE_NODE = 3; /** * If NodeVisitor::enterNode() returns DONT_TRAVERSE_CURRENT_AND_CHILDREN, child nodes * of the current node will not be traversed for any visitors. * * For subsequent visitors enterNode() will not be called as well. * leaveNode() will be invoked for visitors that has enterNode() method invoked. */ public const DONT_TRAVERSE_CURRENT_AND_CHILDREN = 4; /** * If NodeVisitor::enterNode() or NodeVisitor::leaveNode() returns REPLACE_WITH_NULL, * the node will be replaced with null. This is not a legal return value if the node is part * of an array, rather than another node. */ public const REPLACE_WITH_NULL = 5; /** * 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 null|Node[] Array of nodes */ public function beforeTraverse(array $nodes); /** * 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) * * NodeVisitor::REMOVE_NODE * => $node is removed from the parent array * * NodeVisitor::REPLACE_WITH_NULL * => $node is replaced with null * * NodeVisitor::DONT_TRAVERSE_CHILDREN * => Children of $node are not traversed. $node stays as-is * * NodeVisitor::DONT_TRAVERSE_CURRENT_AND_CHILDREN * => Further visitors for the current node are skipped, and its children are not * traversed. $node stays as-is. * * NodeVisitor::STOP_TRAVERSAL * => Traversal is aborted. $node stays as-is * * otherwise * => $node is set to the return value * * @param Node $node Node * * @return null|int|Node|Node[] Replacement node (or special return value) */ public function enterNode(Node $node); /** * Called when leaving a node. * * Return value semantics: * * null * => $node stays as-is * * NodeVisitor::REMOVE_NODE * => $node is removed from the parent array * * NodeVisitor::REPLACE_WITH_NULL * => $node is replaced with null * * NodeVisitor::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 null|int|Node|Node[] 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 null|Node[] Array of nodes */ public function afterTraverse(array $nodes); }