infection / infection

src/Mutator/Arithmetic/PowEqual.php

<?php
/**
 * This code is licensed under the BSD 3-Clause License.
 *
 * Copyright (c) 2017, Maks Rafalko
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *
 * * Neither the name of the copyright holder nor the names of its
 *   contributors may be used to endorse or promote products derived from
 *   this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

declare(strict_types=1);

namespace Infection\Mutator\Arithmetic;

use Infection\Mutator\Definition;
use Infection\Mutator\GetMutatorName;
use Infection\Mutator\Mutator;
use Infection\Mutator\MutatorCategory;
use PhpParser\Node;

/**
 * @internal
 */
final class PowEqual implements Mutator
{
    use GetMutatorName;

    public static function getDefinition(): ?Definition
    {
        return new Definition(
            <<<'TXT'
Replaces an exponentiation assignment operator (`**=`) with a division assignment operator (`/=`).
TXT
            ,
            MutatorCategory::ORTHOGONAL_REPLACEMENT,
            null
        );
    }

    /**
     * Replaces "**=" with "/="
     *
     * @param Node\Expr\AssignOp\Pow $node
     *
     * @return iterable<Node\Expr\AssignOp\Div>
     */
    public function mutate(Node $node): iterable
    {
        yield new Node\Expr\AssignOp\Div($node->var, $node->expr, $node->getAttributes());

Accessing expr on the interface PhpParser\Node suggest that you code against a concrete implementation. How about adding an instanceof check?

Accessing var on the interface PhpParser\Node suggest that you code against a concrete implementation. How about adding an instanceof check?

    }

    public function canMutate(Node $node): bool
    {
        return $node instanceof Node\Expr\AssignOp\Pow;
    }
}