Current File : //home2/vacivi36/code/vendor/rector/rector/vendor/ondram/ci-detector/src/TrinaryLogic.php
<?php
declare (strict_types=1);
namespace RectorPrefix202209\OndraM\CiDetector;
/**
* @see https://en.wikipedia.org/wiki/Three-valued_logic
* @see https://github.com/phpstan/phpstan-src/blob/cedc99f51f7b8d815036e983166d7cb51ab46734/src/TrinaryLogic.php
*
* @internal
*/
final class TrinaryLogic
{
private const YES = 1;
private const MAYBE = 0;
private const NO = -1;
/** @var self[] */
private static $registry = [];
/** @var int */
private $value;
private function __construct(int $value)
{
$this->value = $value;
}
public static function createMaybe() : self
{
return self::create(self::MAYBE);
}
public static function createFromBoolean(bool $value) : self
{
return self::create($value ? self::YES : self::NO);
}
private static function create(int $value) : self
{
return self::$registry[$value] = self::$registry[$value] ?? new self($value);
}
/**
* Return true if its known for sure that the value is true
*/
public function yes() : bool
{
return $this->value === self::YES;
}
/**
* Return true if its not known for sure whether the value is true or false
*/
public function maybe() : bool
{
return $this->value === self::MAYBE;
}
/**
* Return true if its known for sure that the value is false
*/
public function no() : bool
{
return $this->value === self::NO;
}
/**
* Return string representation of the value.
* "Yes" when the value is true, "No" when its false, "Maybe" when its not known for sure whether its true or false.
*/
public function describe() : string
{
static $labels = [self::NO => 'No', self::MAYBE => 'Maybe', self::YES => 'Yes'];
return $labels[$this->value];
}
}
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