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<?php declare(strict_types=1);
/*
* This file is part of PHPUnit.
*
* (c) Sebastian Bergmann <sebastian@phpunit.de>
*
* 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();
}
}