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Filename : Operator.php
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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 $constraint argument.
     */
    protected function checkConstraint($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();
    }
}