* * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace PHPUnit\Framework\Constraint; /** * @no-named-arguments Parameter names are not covered by the backward compatibility promise for PHPUnit */ abstract class Operator extends Constraint { /** * Returns the name of this operator. */ abstract public function operator(): string; /** * Returns this operator's precedence. * * @see https://www.php.net/manual/en/language.operators.precedence.php */ abstract public function precedence(): int; /** * Returns the number of operands. */ abstract public function arity(): int; /** * Validates $constraint argument. */ protected function checkConstraint(mixed $constraint): Constraint { if (!$constraint instanceof Constraint) { return new IsEqual($constraint); } return $constraint; } /** * Returns true if the $constraint needs to be wrapped with braces. */ protected function constraintNeedsParentheses(Constraint $constraint): bool { return $constraint instanceof self && $constraint->arity() > 1 && $this->precedence() <= $constraint->precedence(); } }