Implemented Light blocks

src/block/Light.php

@@ -0,0 +1,57 @@
+<?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\block;
+
+use pocketmine\data\runtime\block\BlockDataReader;
+use pocketmine\data\runtime\block\BlockDataWriter;
+
+final class Light extends Flowable{
+	public const MIN_LIGHT_LEVEL = 0;
+	public const MAX_LIGHT_LEVEL = 15;
+
+	private int $level = self::MAX_LIGHT_LEVEL;
+
+	public function getRequiredTypeDataBits() : int{ return 4; }
+
+	protected function decodeType(BlockDataReader $r) : void{
+		$this->level = $r->readBoundedInt(4, self::MIN_LIGHT_LEVEL, self::MAX_LIGHT_LEVEL);
+	}
+
+	protected function encodeType(BlockDataWriter $w) : void{
+		$w->writeInt(4, $this->level);
+	}
+
+	public function getLightLevel() : int{ return $this->level; }
+
+	/** @return $this */
+	public function setLightLevel(int $level) : self{
+		if($level < self::MIN_LIGHT_LEVEL || $level > self::MAX_LIGHT_LEVEL){
+			throw new \InvalidArgumentException("Light level must be in the range " . self::MIN_LIGHT_LEVEL . " ... " . self::MAX_LIGHT_LEVEL);
+		}
+		$this->level = $level;
+		return $this;
+	}
+
+	public function canBeReplaced() : bool{ return true; }
+}