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<?php declare (strict_types=1); namespace Rector\DeadCode\Rector\For_; use PhpParser\Node; use PhpParser\Node\Expr; use PhpParser\Node\Expr\Variable; use PhpParser\Node\Scalar; use PhpParser\Node\Stmt\For_; use PhpParser\Node\Stmt\Foreach_; use PhpParser\Node\Stmt\If_; use Rector\Core\Rector\AbstractRector; use Rector\EarlyReturn\NodeTransformer\ConditionInverter; use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample; use Symplify\RuleDocGenerator\ValueObject\RuleDefinition; /** * @see \Rector\Tests\DeadCode\Rector\For_\RemoveDeadIfForeachForRector\RemoveDeadIfForeachForRectorTest */ final class RemoveDeadIfForeachForRector extends AbstractRector { /** * @readonly * @var \Rector\EarlyReturn\NodeTransformer\ConditionInverter */ private $conditionInverter; public function __construct(ConditionInverter $conditionInverter) { $this->conditionInverter = $conditionInverter; } public function getRuleDefinition() : RuleDefinition { return new RuleDefinition('Remove if, foreach and for that does not do anything', [new CodeSample(<<<'CODE_SAMPLE' class SomeClass { public function run($someObject) { $value = 5; if ($value) { } if ($someObject->run()) { } foreach ($values as $value) { } return $value; } } CODE_SAMPLE , <<<'CODE_SAMPLE' class SomeClass { public function run($someObject) { $value = 5; if ($someObject->run()) { } return $value; } } CODE_SAMPLE )]); } /** * @return array<class-string<Node>> */ public function getNodeTypes() : array { return [For_::class, If_::class, Foreach_::class]; } /** * @param For_|If_|Foreach_ $node */ public function refactor(Node $node) : ?Node { if ($node instanceof If_) { $this->processIf($node); return null; } if ($node instanceof Foreach_) { $this->processForeach($node); return null; } // For if ($node->stmts !== []) { return null; } $this->removeNode($node); return null; } private function processIf(If_ $if) : void { if ($if->stmts !== []) { return; } if ($if->elseifs !== []) { return; } if ($if->else !== null) { $if->cond = $this->conditionInverter->createInvertedCondition($if->cond); $if->stmts = $if->else->stmts; $if->else = null; return; } if ($this->isNodeWithSideEffect($if->cond)) { return; } $this->removeNode($if); } private function processForeach(Foreach_ $foreach) : void { if ($foreach->stmts !== []) { return; } if ($this->isNodeWithSideEffect($foreach->expr)) { return; } $this->removeNode($foreach); } private function isNodeWithSideEffect(Expr $expr) : bool { if ($expr instanceof Variable) { return \false; } if ($expr instanceof Scalar) { return \false; } return !$this->valueResolver->isTrueOrFalse($expr); } }
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