mirror of
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114 lines
2.7 KiB
PHP
114 lines
2.7 KiB
PHP
<?php
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/*
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*
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* ____ _ _ __ __ _ __ __ ____
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* | _ \ ___ ___| | _____| |_| \/ (_)_ __ ___ | \/ | _ \
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* | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
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* | __/ (_) | (__| < __/ |_| | | | | | | | __/_____| | | | __/
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* |_| \___/ \___|_|\_\___|\__|_| |_|_|_| |_|\___| |_| |_|_|
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* @author PocketMine Team
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* @link http://www.pocketmine.net/
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*
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*
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*/
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declare(strict_types=1);
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namespace pocketmine\data\runtime;
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use function ceil;
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use function count;
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use function log;
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use function spl_object_id;
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use function usort;
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/**
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* A big hack to allow lazily associating enum cases with packed bit values for RuntimeDataDescriber :)
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*
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* @internal
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* @phpstan-template T of \UnitEnum
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*/
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final class RuntimeEnumMetadata{
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public readonly int $bits;
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/**
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* @var object[]
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* @phpstan-var list<T>
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*/
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private readonly array $intToEnum;
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/**
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* @var int[]
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* @phpstan-var array<int, int>
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*/
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private readonly array $enumToInt;
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/**
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* @param \UnitEnum[] $members
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* @phpstan-param list<T> $members
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*/
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public function __construct(
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array $members
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){
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usort($members, fn(\UnitEnum $a, \UnitEnum $b) => $a->name <=> $b->name); //sort by name to ensure consistent ordering (and thus consistent bit assignments)
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$this->bits = (int) ceil(log(count($members), 2));
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$this->intToEnum = $members; //usort strips keys so this is already a list
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$reversed = [];
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foreach($this->intToEnum as $int => $enum){
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$reversed[spl_object_id($enum)] = $int;
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}
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$this->enumToInt = $reversed;
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}
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/**
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* @phpstan-return T|null
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*/
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public function intToEnum(int $value) : ?object{
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return $this->intToEnum[$value] ?? null;
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}
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/**
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* @phpstan-param T $enum
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*/
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public function enumToInt(object $enum) : int{
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return $this->enumToInt[spl_object_id($enum)];
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}
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/**
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* @var self[]
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* @phpstan-var array<class-string, object>
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*/
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private static array $cache = [];
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/**
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* @phpstan-template TEnum of \UnitEnum
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* @phpstan-param TEnum $case
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*
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* @phpstan-return self<TEnum>
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*/
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public static function from(\UnitEnum $case) : self{
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$class = $case::class;
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/** @phpstan-var self<TEnum>|null $metadata */
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$metadata = self::$cache[$class] ?? null;
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if($metadata === null){
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/**
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* PHPStan can't infer this correctly :( https://github.com/phpstan/phpstan/issues/7162
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* @phpstan-var list<TEnum> $cases
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*/
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$cases = $case::cases();
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self::$cache[$class] = $metadata = new self($cases);
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}
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return $metadata;
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}
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}
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