block: added HorizontalFacingTrait and AnyFacingTrait

these are primarily intended for deduplication of code and ability to cross-reference. Don't expect this API to remain the same.

src/block/utils/AnyFacingTrait.php

@@ -0,0 +1,40 @@
+<?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\utils;
+
+use pocketmine\math\Facing;
+
+trait AnyFacingTrait{
+	/** @var int */
+	protected $facing = Facing::DOWN;
+
+	public function getFacing() : int{ return $this->facing; }
+
+	/** @return $this */
+	public function setFacing(int $facing) : self{
+		Facing::validate($this->facing);
+		$this->facing = $facing;
+		return $this;
+	}
+}

src/block/utils/HorizontalFacingTrait.php

@@ -0,0 +1,43 @@
+<?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\utils;
+
+use pocketmine\math\Facing;
+use function in_array;
+
+trait HorizontalFacingTrait{
+	/** @var int */
+	protected $facing = Facing::NORTH;
+
+	public function getFacing() : int{ return $this->facing; }
+
+	/** @return $this */
+	public function setFacing(int $facing) : self{
+		if(!in_array($facing, Facing::HORIZONTAL, true)){
+			throw new \InvalidArgumentException("Facing must be horizontal");
+		}
+		$this->facing = $facing;
+		return $this;
+	}
+}