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