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71 lines
1.8 KiB
PHP
71 lines
1.8 KiB
PHP
<?php
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declare (strict_types=1);
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namespace RectorPrefix202403\OndraM\CiDetector;
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/**
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* @see https://en.wikipedia.org/wiki/Three-valued_logic
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* @see https://github.com/phpstan/phpstan-src/blob/cedc99f51f7b8d815036e983166d7cb51ab46734/src/TrinaryLogic.php
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*
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* @internal
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*/
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final class TrinaryLogic
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{
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private const YES = 1;
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private const MAYBE = 0;
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private const NO = -1;
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/** @var self[] */
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private static $registry = [];
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/**
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* @var int
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*/
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private $value;
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private function __construct(int $value)
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{
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$this->value = $value;
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}
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public static function createMaybe() : self
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{
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return self::create(self::MAYBE);
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}
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public static function createFromBoolean(bool $value) : self
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{
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return self::create($value ? self::YES : self::NO);
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}
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/**
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* Return true if it's known for sure that the value is true
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*/
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public function yes() : bool
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{
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return $this->value === self::YES;
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}
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/**
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* Return true if it's not known for sure whether the value is true or false
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*/
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public function maybe() : bool
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{
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return $this->value === self::MAYBE;
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}
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/**
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* Return true if it's known for sure that the value is false
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*/
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public function no() : bool
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{
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return $this->value === self::NO;
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}
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/**
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* Return string representation of the value.
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* "Yes" when the value is true, "No" when its false, "Maybe" when it's not known for sure whether its
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* true or false.
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*/
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public function describe() : string
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{
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static $labels = [self::NO => 'No', self::MAYBE => 'Maybe', self::YES => 'Yes'];
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return $labels[$this->value];
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}
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private static function create(int $value) : self
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{
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return self::$registry[$value] = self::$registry[$value] ?? new self($value);
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}
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}
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