ItemEnchantmentTagRegistry.php

<?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\item\enchantment\ItemEnchantmentTags as Tags;
use pocketmine\utils\SingletonTrait;
use pocketmine\utils\Utils;
use function array_diff;
use function array_intersect;
use function array_merge;
use function array_search;
use function array_shift;
use function array_unique;
use function count;
 
final class ItemEnchantmentTagRegistry{
    use SingletonTrait;
 
    private array $tagMap = [];
 
    private function __construct(){
        $this->register(Tags::ARMOR, [Tags::HELMET, Tags::CHESTPLATE, Tags::LEGGINGS, Tags::BOOTS]);
        $this->register(Tags::SHIELD);
        $this->register(Tags::SWORD);
        $this->register(Tags::TRIDENT);
        $this->register(Tags::BOW);
        $this->register(Tags::CROSSBOW);
        $this->register(Tags::SHEARS);
        $this->register(Tags::FLINT_AND_STEEL);
        $this->register(Tags::BLOCK_TOOLS, [Tags::AXE, Tags::PICKAXE, Tags::SHOVEL, Tags::HOE]);
        $this->register(Tags::FISHING_ROD);
        $this->register(Tags::CARROT_ON_STICK);
        $this->register(Tags::COMPASS);
        $this->register(Tags::MASK);
        $this->register(Tags::ELYTRA);
        $this->register(Tags::BRUSH);
        $this->register(Tags::WEAPONS, [
            Tags::SWORD,
            Tags::TRIDENT,
            Tags::BOW,
            Tags::CROSSBOW,
            Tags::BLOCK_TOOLS,
        ]);
    }
 
    public function register(string $tag, array $nestedTags = []) : void{
        $this->assertNotInternalTag($tag);
 
        foreach($nestedTags as $nestedTag){
            if(!isset($this->tagMap[$nestedTag])){
                $this->register($nestedTag);
            }
            $this->tagMap[$tag][] = $nestedTag;
        }
 
        if(!isset($this->tagMap[$tag])){
            $this->tagMap[$tag] = [];
            $this->tagMap[Tags::ALL][] = $tag;
        }
    }
 
    public function unregister(string $tag) : void{
        if(!isset($this->tagMap[$tag])){
            return;
        }
        $this->assertNotInternalTag($tag);
 
        unset($this->tagMap[$tag]);
 
        foreach(Utils::stringifyKeys($this->tagMap) as $key => $nestedTags){
            if(($nestedKey = array_search($tag, $nestedTags, true)) !== false){
                unset($this->tagMap[$key][$nestedKey]);
            }
        }
    }
 
    public function removeNested(string $tag, array $nestedTags) : void{
        $this->assertNotInternalTag($tag);
        $this->tagMap[$tag] = array_diff($this->tagMap[$tag], $nestedTags);
    }
 
    public function getNested(string $tag) : array{
        return $this->tagMap[$tag] ?? [];
    }
 
    public function isTagArrayIntersection(array $firstTags, array $secondTags) : bool{
        if(count($firstTags) === 0 || count($secondTags) === 0){
            return false;
        }
 
        $firstLeafTags = $this->getLeafTagsForArray($firstTags);
        $secondLeafTags = $this->getLeafTagsForArray($secondTags);
 
        return count(array_intersect($firstLeafTags, $secondLeafTags)) !== 0;
    }
 
    private function getLeafTagsForArray(array $tags) : array{
        $leafTagArrays = [];
        foreach($tags as $tag){
            $leafTagArrays[] = $this->getLeafTags($tag);
        }
        return array_unique(array_merge(...$leafTagArrays));
    }
 
    private function getLeafTags(string $tag) : array{
        $result = [];
        $tagsToHandle = [$tag];
 
        while(count($tagsToHandle) !== 0){
            $currentTag = array_shift($tagsToHandle);
            $nestedTags = $this->getNested($currentTag);
 
            if(count($nestedTags) === 0){
                $result[] = $currentTag;
            }else{
                $tagsToHandle = array_merge($tagsToHandle, $nestedTags);
            }
        }
 
        return $result;
    }
 
    private function assertNotInternalTag(string $tag) : void{
        if($tag === Tags::ALL){
            throw new \InvalidArgumentException(
                "Cannot perform any operations on the internal item enchantment tag '$tag'"
            );
        }
    }
}