Removed pocketmine subdirectory, map PSR-4 style

src/world/utils/SubChunkIteratorManager.php

@@ -0,0 +1,92 @@
+<?php
+
+/*
+ *
+ *  ____            _        _   __  __ _                  __  __ ____
+ * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \
+ * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
+ * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/
+ * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_|
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * @author PocketMine Team
+ * @link http://www.pocketmine.net/
+ *
+ *
+*/
+
+declare(strict_types=1);
+
+namespace pocketmine\world\utils;
+
+use pocketmine\utils\Utils;
+use pocketmine\world\ChunkManager;
+use pocketmine\world\format\Chunk;
+use pocketmine\world\format\EmptySubChunk;
+use pocketmine\world\format\SubChunkInterface;
+
+class SubChunkIteratorManager{
+	/** @var ChunkManager */
+	public $world;
+
+	/** @var Chunk|null */
+	public $currentChunk;
+	/** @var SubChunkInterface|null */
+	public $currentSubChunk;
+
+	/** @var int */
+	protected $currentX;
+	/** @var int */
+	protected $currentY;
+	/** @var int */
+	protected $currentZ;
+
+	/** @var \Closure|null */
+	private $onSubChunkChangeFunc = null;
+
+	public function __construct(ChunkManager $world){
+		$this->world = $world;
+	}
+
+	public function moveTo(int $x, int $y, int $z, bool $create) : bool{
+		if($this->currentChunk === null or $this->currentX !== ($x >> 4) or $this->currentZ !== ($z >> 4)){
+			$this->currentX = $x >> 4;
+			$this->currentZ = $z >> 4;
+			$this->currentSubChunk = null;
+
+			$this->currentChunk = $this->world->getChunk($this->currentX, $this->currentZ, $create);
+			if($this->currentChunk === null){
+				return false;
+			}
+		}
+
+		if($this->currentSubChunk === null or $this->currentY !== ($y >> 4)){
+			$this->currentY = $y >> 4;
+
+			$this->currentSubChunk = $this->currentChunk->getSubChunk($y >> 4, $create);
+			if($this->currentSubChunk instanceof EmptySubChunk){
+				$this->currentSubChunk = null;
+				return false;
+			}
+			if($this->onSubChunkChangeFunc !== null){
+				($this->onSubChunkChangeFunc)();
+			}
+		}
+
+		return true;
+	}
+
+	public function onSubChunkChange(\Closure $callback) : void{
+		Utils::validateCallableSignature(function(){}, $callback);
+		$this->onSubChunkChangeFunc = $callback;
+	}
+
+	public function invalidate() : void{
+		$this->currentChunk = null;
+		$this->currentSubChunk = null;
+	}
+}