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<?php declare (strict_types=1); namespace Rector\DeadCode\Rector\MethodCall; use PhpParser\Node; use PhpParser\Node\Arg; use PhpParser\Node\Expr\ArrowFunction; use PhpParser\Node\Expr\Assign; use PhpParser\Node\Expr\ConstFetch; use PhpParser\Node\Expr\MethodCall; use PhpParser\Node\Stmt\Class_; use PhpParser\Node\Stmt\ClassLike; use PhpParser\Node\Stmt\ClassMethod; use PhpParser\Node\Stmt\Enum_; use PhpParser\Node\Stmt\Expression; use PhpParser\Node\Stmt\If_; use PhpParser\Node\Stmt\Interface_; use PhpParser\Node\Stmt\Trait_; use PHPStan\Analyser\Scope; use PHPStan\Type\ThisType; use PHPStan\Type\TypeWithClassName; use Rector\Core\NodeAnalyzer\CallAnalyzer; use Rector\Core\PhpParser\AstResolver; use Rector\Core\Rector\AbstractRector; use Rector\NodeTypeResolver\Node\AttributeKey; use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample; use Symplify\RuleDocGenerator\ValueObject\RuleDefinition; /** * @see \Rector\Tests\DeadCode\Rector\MethodCall\RemoveEmptyMethodCallRector\RemoveEmptyMethodCallRectorTest */ final class RemoveEmptyMethodCallRector extends AbstractRector { /** * @readonly * @var \Rector\Core\PhpParser\AstResolver */ private $reflectionAstResolver; /** * @readonly * @var \Rector\Core\NodeAnalyzer\CallAnalyzer */ private $callAnalyzer; public function __construct(AstResolver $reflectionAstResolver, CallAnalyzer $callAnalyzer) { $this->reflectionAstResolver = $reflectionAstResolver; $this->callAnalyzer = $callAnalyzer; } public function getRuleDefinition() : RuleDefinition { return new RuleDefinition('Remove empty method call', [new CodeSample(<<<'CODE_SAMPLE' class SomeClass { public function callThis() { } } $some = new SomeClass(); $some->callThis(); CODE_SAMPLE , <<<'CODE_SAMPLE' class SomeClass { public function callThis() { } } $some = new SomeClass(); CODE_SAMPLE )]); } /** * @return array<class-string<Node>> */ public function getNodeTypes() : array { return [MethodCall::class]; } /** * @param MethodCall $node */ public function refactor(Node $node) : ?Node { $scope = $this->getScope($node); if (!$scope instanceof Scope) { return null; } $type = $scope->getType($node->var); if (!$type instanceof TypeWithClassName) { return null; } $classLike = $this->reflectionAstResolver->resolveClassFromObjectType($type); if (!$classLike instanceof ClassLike) { return null; } if ($this->shouldSkipClassMethod($classLike, $node, $type)) { return null; } // if->cond cannot removed, it has to be replaced with false, see https://3v4l.org/U9S9i $parent = $node->getAttribute(AttributeKey::PARENT_NODE); if ($parent instanceof If_ && $parent->cond === $node) { return $this->nodeFactory->createFalse(); } if ($parent instanceof Assign) { return $this->nodeFactory->createFalse(); } if ($parent instanceof ArrowFunction && $this->nodeComparator->areNodesEqual($parent->expr, $node)) { return $this->processArrowFunction($parent, $node); } if (!$parent instanceof Expression) { return null; } $this->removeNode($node); return $node; } private function getScope(MethodCall $methodCall) : ?Scope { if ($this->callAnalyzer->isObjectCall($methodCall->var)) { return null; } $parentArg = $this->betterNodeFinder->findParentType($methodCall, Arg::class); if ($parentArg instanceof Arg) { return null; } $scope = $methodCall->var->getAttribute(AttributeKey::SCOPE); if (!$scope instanceof Scope) { return null; } return $scope; } /** * @param \PhpParser\Node\Stmt\Class_|\PhpParser\Node\Stmt\Trait_|\PhpParser\Node\Stmt\Interface_|\PhpParser\Node\Stmt\Enum_ $classLike */ private function shouldSkipClassMethod($classLike, MethodCall $methodCall, TypeWithClassName $typeWithClassName) : bool { if (!$classLike instanceof Class_) { return \true; } $methodName = $this->getName($methodCall->name); if ($methodName === null) { return \true; } $classMethod = $classLike->getMethod($methodName); if (!$classMethod instanceof ClassMethod) { return \true; } if ($classMethod->isAbstract()) { return \true; } if ((array) $classMethod->stmts !== []) { return \true; } $class = $this->betterNodeFinder->findParentType($methodCall, Class_::class); if (!$class instanceof Class_) { return \false; } if (!$typeWithClassName instanceof ThisType) { return \false; } if ($class->isFinal()) { return \false; } return !$classMethod->isPrivate(); } /** * @return \PhpParser\Node\Expr\MethodCall|\PhpParser\Node\Expr\ConstFetch */ private function processArrowFunction(ArrowFunction $arrowFunction, MethodCall $methodCall) { $parentOfParent = $arrowFunction->getAttribute(AttributeKey::PARENT_NODE); if ($parentOfParent instanceof Expression) { $this->removeNode($arrowFunction); return $methodCall; } return $this->nodeFactory->createFalse(); } }
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