Implemented Sharpness, Fire Aspect and Knockback enchantments

src/pocketmine/item/enchantment/MeleeWeaponEnchantment.php

@@ -0,0 +1,63 @@
+<?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\item\enchantment;
+
+use pocketmine\entity\Entity;
+
+/**
+ * Classes extending this class can be applied to weapons and activate when used by a mob to attack another mob in melee
+ * combat.
+ */
+abstract class MeleeWeaponEnchantment extends Enchantment{
+
+	/**
+	 * Returns whether this melee enchantment has an effect on the target entity. For example, Smite only applies to
+	 * undead mobs.
+	 *
+	 * @param Entity $victim
+	 *
+	 * @return bool
+	 */
+	abstract public function isApplicableTo(Entity $victim) : bool;
+
+	/**
+	 * Returns the amount of additional damage caused by this enchantment to applicable targets.
+	 *
+	 * @param int $enchantmentLevel
+	 *
+	 * @return float
+	 */
+	abstract public function getDamageBonus(int $enchantmentLevel) : float;
+
+	/**
+	 * Called after damaging the entity to apply any post damage effects to the target.
+	 *
+	 * @param Entity $attacker
+	 * @param Entity $victim
+	 * @param int    $enchantmentLevel
+	 */
+	public function onPostAttack(Entity $attacker, Entity $victim, int $enchantmentLevel) : void{
+
+	}
+}