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<?php |
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/** |
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* This code is licensed under the BSD 3-Clause License. |
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* |
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* Copyright (c) 2017, Maks Rafalko |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are met: |
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* |
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* * Redistributions of source code must retain the above copyright notice, this |
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* list of conditions and the following disclaimer. |
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* |
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* * Redistributions in binary form must reproduce the above copyright notice, |
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* this list of conditions and the following disclaimer in the documentation |
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* and/or other materials provided with the distribution. |
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* |
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* * Neither the name of the copyright holder nor the names of its |
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* contributors may be used to endorse or promote products derived from |
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* this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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declare(strict_types=1); |
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namespace Infection\Mutator\Number; |
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use function in_array; |
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use Infection\Mutator\Definition; |
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use Infection\Mutator\GetMutatorName; |
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use Infection\Mutator\MutatorCategory; |
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use Infection\PhpParser\Visitor\ParentConnector; |
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use PhpParser\Node; |
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/** |
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* @internal |
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*/ |
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final class DecrementInteger extends AbstractNumberMutator |
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{ |
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use GetMutatorName; |
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private const COUNT_NAMES = [ |
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'count', |
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'grapheme_strlen', |
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'iconv_strlen', |
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'mb_strlen', |
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'sizeof', |
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'strlen', |
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]; |
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public static function getDefinition(): ?Definition |
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{ |
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return new Definition( |
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'Decrements an integer value with 1.', |
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MutatorCategory::ORTHOGONAL_REPLACEMENT, |
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null |
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); |
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} |
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/** |
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* @param Node\Scalar\LNumber $node |
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* |
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* @return iterable<Node\Scalar\LNumber> |
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*/ |
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public function mutate(Node $node): iterable |
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{ |
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yield new Node\Scalar\LNumber($node->value - 1); |
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} |
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public function canMutate(Node $node): bool |
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{ |
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if (!$node instanceof Node\Scalar\LNumber || $node->value === 1) { |
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return false; |
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} |
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if ($this->isArrayZeroIndexAccess($node)) { |
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return false; |
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} |
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if ($this->isPartOfSizeComparison($node)) { |
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return false; |
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} |
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return $this->isAllowedComparison($node); |
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} |
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private function isAllowedComparison(Node\Scalar\LNumber $node): bool |
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{ |
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if ($node->value !== 0) { |
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return true; |
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} |
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$parentNode = ParentConnector::getParent($node); |
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if (!$this->isComparison($parentNode)) { |
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return true; |
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} |
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/** @var Node\Expr\BinaryOp $parentNode */ |
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if ($parentNode->left instanceof Node\Expr\FuncCall && $parentNode->left->name instanceof Node\Name |
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&& in_array( |
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$parentNode->left->name->toLowerString(), |
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self::COUNT_NAMES, |
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true |
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) |
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) { |
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return false; |
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} |
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if ($parentNode->right instanceof Node\Expr\FuncCall && $parentNode->right->name instanceof Node\Name |
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&& in_array( |
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$parentNode->right->name->toLowerString(), |
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self::COUNT_NAMES, |
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true |
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) |
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) { |
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return false; |
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} |
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return true; |
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} |
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private function isComparison(Node $parentNode): bool |
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{ |
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return $parentNode instanceof Node\Expr\BinaryOp\Identical |
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|| $parentNode instanceof Node\Expr\BinaryOp\NotIdentical |
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|| $parentNode instanceof Node\Expr\BinaryOp\Equal |
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|| $parentNode instanceof Node\Expr\BinaryOp\NotEqual |
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|| $parentNode instanceof Node\Expr\BinaryOp\Greater |
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|| $parentNode instanceof Node\Expr\BinaryOp\GreaterOrEqual |
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|| $parentNode instanceof Node\Expr\BinaryOp\Smaller |
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|| $parentNode instanceof Node\Expr\BinaryOp\SmallerOrEqual |
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; |
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} |
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private function isArrayZeroIndexAccess(Node $node): bool |
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{ |
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if (!$node instanceof Node\Scalar\LNumber) { |
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return false; |
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} |
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/** @var Node\Scalar\LNumber $node */ |
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if ($node->value !== 0) { |
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return false; |
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} |
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if (ParentConnector::getParent($node) instanceof Node\Expr\ArrayDimFetch) { |
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return true; |
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} |
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return false; |
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} |
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} |
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infection /
infection
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