Removed pocketmine subdirectory, map PSR-4 style

src/world/generator/populator/GroundCover.php

@@ -0,0 +1,72 @@
+<?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\generator\populator;
+
+use pocketmine\block\BlockFactory;
+use pocketmine\block\BlockLegacyIds;
+use pocketmine\block\Liquid;
+use pocketmine\utils\Random;
+use pocketmine\world\biome\Biome;
+use pocketmine\world\ChunkManager;
+use function count;
+use function min;
+
+class GroundCover extends Populator{
+
+	public function populate(ChunkManager $world, int $chunkX, int $chunkZ, Random $random) : void{
+		$chunk = $world->getChunk($chunkX, $chunkZ);
+		for($x = 0; $x < 16; ++$x){
+			for($z = 0; $z < 16; ++$z){
+				$biome = Biome::getBiome($chunk->getBiomeId($x, $z));
+				$cover = $biome->getGroundCover();
+				if(count($cover) > 0){
+					$diffY = 0;
+					if(!$cover[0]->isSolid()){
+						$diffY = 1;
+					}
+
+					for($y = 127; $y > 0; --$y){
+						if(!BlockFactory::fromFullBlock($chunk->getFullBlock($x, $y, $z))->isTransparent()){
+							break;
+						}
+					}
+					$startY = min(127, $y + $diffY);
+					$endY = $startY - count($cover);
+					for($y = $startY; $y > $endY and $y >= 0; --$y){
+						$b = $cover[$startY - $y];
+						$id = BlockFactory::fromFullBlock($chunk->getFullBlock($x, $y, $z));
+						if($id->getId() === BlockLegacyIds::AIR and $b->isSolid()){
+							break;
+						}
+						if($b->canBeFlowedInto() and $id instanceof Liquid){
+							continue;
+						}
+
+						$chunk->setFullBlock($x, $y, $z, $b->getFullId());
+					}
+				}
+			}
+		}
+	}
+}