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Filename : NodeTraverser.php
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<?php declare(strict_types = 1);

namespace PHPStan\PhpDocParser\Ast;

use LogicException;
use PHPStan\PhpDocParser\Ast\ConstExpr\ConstExprNode;
use PHPStan\PhpDocParser\Ast\PhpDoc\PhpDocChildNode;
use PHPStan\PhpDocParser\Ast\PhpDoc\PhpDocTagValueNode;
use PHPStan\PhpDocParser\Ast\Type\TypeNode;
use function array_keys;
use function array_pop;
use function array_splice;
use function count;
use function get_class;
use function get_object_vars;
use function gettype;
use function is_array;
use function sprintf;

/**
 * Inspired by https://github.com/nikic/PHP-Parser/tree/36a6dcd04e7b0285e8f0868f44bd4927802f7df1
 *
 * Copyright (c) 2011, Nikita Popov
 * All rights reserved.
 */
final class NodeTraverser
{

	/**
	 * 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;

	/** @var list<NodeVisitor> Visitors */
	private $visitors = [];

	/** @var bool Whether traversal should be stopped */
	private $stopTraversal;

	/**
	 * @param list<NodeVisitor> $visitors
	 */
	public function __construct(array $visitors)
	{
		$this->visitors = $visitors;
	}

	/**
	 * Traverses an array of nodes using the registered visitors.
	 *
	 * @param Node[] $nodes Array of nodes
	 *
	 * @return Node[] Traversed array of nodes
	 */
	public function traverse(array $nodes): array
	{
		$this->stopTraversal = false;

		foreach ($this->visitors as $visitor) {
			$return = $visitor->beforeTraverse($nodes);
			if ($return === null) {
				continue;
			}

			$nodes = $return;
		}

		$nodes = $this->traverseArray($nodes);

		foreach ($this->visitors as $visitor) {
			$return = $visitor->afterTraverse($nodes);
			if ($return === null) {
				continue;
			}

			$nodes = $return;
		}

		return $nodes;
	}

	/**
	 * Recursively traverse a node.
	 *
	 * @param Node $node Node to traverse.
	 *
	 * @return Node Result of traversal (may be original node or new one)
	 */
	private function traverseNode(Node $node): Node
	{
		$subNodeNames = array_keys(get_object_vars($node));
		foreach ($subNodeNames as $name) {
			$subNode =& $node->$name;

			if (is_array($subNode)) {
				$subNode = $this->traverseArray($subNode);
				if ($this->stopTraversal) {
					break;
				}
			} elseif ($subNode instanceof Node) {
				$traverseChildren = true;
				$breakVisitorIndex = null;

				foreach ($this->visitors as $visitorIndex => $visitor) {
					$return = $visitor->enterNode($subNode);
					if ($return === null) {
						continue;
					}

					if ($return instanceof Node) {
						$this->ensureReplacementReasonable($subNode, $return);
						$subNode = $return;
					} elseif ($return === self::DONT_TRAVERSE_CHILDREN) {
						$traverseChildren = false;
					} elseif ($return === self::DONT_TRAVERSE_CURRENT_AND_CHILDREN) {
						$traverseChildren = false;
						$breakVisitorIndex = $visitorIndex;
						break;
					} elseif ($return === self::STOP_TRAVERSAL) {
						$this->stopTraversal = true;
						break 2;
					} else {
						throw new LogicException(
							'enterNode() returned invalid value of type ' . gettype($return)
						);
					}
				}

				if ($traverseChildren) {
					$subNode = $this->traverseNode($subNode);
					if ($this->stopTraversal) {
						break;
					}
				}

				foreach ($this->visitors as $visitorIndex => $visitor) {
					$return = $visitor->leaveNode($subNode);

					if ($return !== null) {
						if ($return instanceof Node) {
							$this->ensureReplacementReasonable($subNode, $return);
							$subNode = $return;
						} elseif ($return === self::STOP_TRAVERSAL) {
							$this->stopTraversal = true;
							break 2;
						} elseif (is_array($return)) {
							throw new LogicException(
								'leaveNode() may only return an array ' .
								'if the parent structure is an array'
							);
						} else {
							throw new LogicException(
								'leaveNode() returned invalid value of type ' . gettype($return)
							);
						}
					}

					if ($breakVisitorIndex === $visitorIndex) {
						break;
					}
				}
			}
		}

		return $node;
	}

	/**
	 * Recursively traverse array (usually of nodes).
	 *
	 * @param mixed[] $nodes Array to traverse
	 *
	 * @return mixed[] Result of traversal (may be original array or changed one)
	 */
	private function traverseArray(array $nodes): array
	{
		$doNodes = [];

		foreach ($nodes as $i => &$node) {
			if ($node instanceof Node) {
				$traverseChildren = true;
				$breakVisitorIndex = null;

				foreach ($this->visitors as $visitorIndex => $visitor) {
					$return = $visitor->enterNode($node);
					if ($return === null) {
						continue;
					}

					if ($return instanceof Node) {
						$this->ensureReplacementReasonable($node, $return);
						$node = $return;
					} elseif (is_array($return)) {
						$doNodes[] = [$i, $return];
						continue 2;
					} elseif ($return === self::REMOVE_NODE) {
						$doNodes[] = [$i, []];
						continue 2;
					} elseif ($return === self::DONT_TRAVERSE_CHILDREN) {
						$traverseChildren = false;
					} elseif ($return === self::DONT_TRAVERSE_CURRENT_AND_CHILDREN) {
						$traverseChildren = false;
						$breakVisitorIndex = $visitorIndex;
						break;
					} elseif ($return === self::STOP_TRAVERSAL) {
						$this->stopTraversal = true;
						break 2;
					} else {
						throw new LogicException(
							'enterNode() returned invalid value of type ' . gettype($return)
						);
					}
				}

				if ($traverseChildren) {
					$node = $this->traverseNode($node);
					if ($this->stopTraversal) {
						break;
					}
				}

				foreach ($this->visitors as $visitorIndex => $visitor) {
					$return = $visitor->leaveNode($node);

					if ($return !== null) {
						if ($return instanceof Node) {
							$this->ensureReplacementReasonable($node, $return);
							$node = $return;
						} elseif (is_array($return)) {
							$doNodes[] = [$i, $return];
							break;
						} elseif ($return === self::REMOVE_NODE) {
							$doNodes[] = [$i, []];
							break;
						} elseif ($return === self::STOP_TRAVERSAL) {
							$this->stopTraversal = true;
							break 2;
						} else {
							throw new LogicException(
								'leaveNode() returned invalid value of type ' . gettype($return)
							);
						}
					}

					if ($breakVisitorIndex === $visitorIndex) {
						break;
					}
				}
			} elseif (is_array($node)) {
				throw new LogicException('Invalid node structure: Contains nested arrays');
			}
		}

		if (count($doNodes) > 0) {
			while ([$i, $replace] = array_pop($doNodes)) {
				array_splice($nodes, $i, 1, $replace);
			}
		}

		return $nodes;
	}

	private function ensureReplacementReasonable(Node $old, Node $new): void
	{
		if ($old instanceof TypeNode && !$new instanceof TypeNode) {
			throw new LogicException(sprintf('Trying to replace TypeNode with %s', get_class($new)));
		}

		if ($old instanceof ConstExprNode && !$new instanceof ConstExprNode) {
			throw new LogicException(sprintf('Trying to replace ConstExprNode with %s', get_class($new)));
		}

		if ($old instanceof PhpDocChildNode && !$new instanceof PhpDocChildNode) {
			throw new LogicException(sprintf('Trying to replace PhpDocChildNode with %s', get_class($new)));
		}

		if ($old instanceof PhpDocTagValueNode && !$new instanceof PhpDocTagValueNode) {
			throw new LogicException(sprintf('Trying to replace PhpDocTagValueNode with %s', get_class($new)));
		}
	}

}