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<?php declare(strict_types=1);
namespace 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];
}
}