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Multiplication.php
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Multiplication.php
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<?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 Infection\PhpParser\Visitor\ParentConnector;
use Infection\PhpParser\Visitor\ReflectionVisitor;
use function is_string;
use PhpParser\Node;
/**
* @internal
*
* @implements Mutator<Node\Expr\BinaryOp\Mul>
*/
final class Multiplication implements Mutator
{
use GetMutatorName;
public static function getDefinition(): ?Definition
{
return new Definition(
<<<'TXT'
Replaces a multiplication operator (`*`) with a division assignment operator (`/`).
TXT
,
MutatorCategory::ORTHOGONAL_REPLACEMENT,
null,
<<<'DIFF'
- $a = $b * $c;
+ $a = $b / $c;
DIFF
);
}
/**
* @psalm-mutation-free
*
* @return iterable<Node\Expr\BinaryOp\Div>
*/
public function mutate(Node $node): iterable
{
yield new Node\Expr\BinaryOp\Div($node->left, $node->right, $node->getAttributes());
}
public function canMutate(Node $node): bool
{
if (!$node instanceof Node\Expr\BinaryOp\Mul) {
return false;
}
if ($this->isNumericOne($node->left) || $this->isNumericOne($node->right)) {
return false;
}
if ($node->left instanceof Node\Expr\UnaryMinus && $this->isNumericOne($node->left->expr)) {
return false;
}
if ($node->right instanceof Node\Expr\UnaryMinus && $this->isNumericOne($node->right->expr)) {
return false;
}
$functionScope = $node->getAttribute(ReflectionVisitor::FUNCTION_SCOPE_KEY);
if (!$functionScope instanceof Node\Stmt\ClassMethod) {
return true;
}
$parentNode = ParentConnector::getParent($node);
if (!$parentNode instanceof Node\Stmt\Return_) {
return true;
}
$returnType = $functionScope->getReturnType();
if ($returnType instanceof Node\Identifier) {
$returnType = $returnType->name;
}
return !(is_string($returnType) && $returnType === 'int');
}
private function isNumericOne(Node $node): bool
{
if ($node instanceof Node\Scalar\LNumber && $node->value === 1) {
return true;
}
return $node instanceof Node\Scalar\DNumber && $node->value === 1.0;
}
}