晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //opt/cpanel/ea-wappspector/vendor/phpstan/phpdoc-parser/src/Ast/NodeVisitor.php
<?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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