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<?php declare (strict_types=1); namespace Rector\DeadCode\Rector\ClassMethod; use PhpParser\Node; use PhpParser\Node\Expr\MethodCall; use PhpParser\Node\Expr\Variable; use PhpParser\Node\Stmt\Class_; use PhpParser\Node\Stmt\ClassMethod; use PHPStan\Reflection\ClassReflection; use Rector\Core\Rector\AbstractRector; use Rector\Core\Reflection\ReflectionResolver; use Rector\Core\ValueObject\MethodName; use Rector\DeadCode\NodeAnalyzer\IsClassMethodUsedAnalyzer; use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample; use Symplify\RuleDocGenerator\ValueObject\RuleDefinition; /** * @see \Rector\Tests\DeadCode\Rector\ClassMethod\RemoveUnusedPrivateMethodRector\RemoveUnusedPrivateMethodRectorTest */ final class RemoveUnusedPrivateMethodRector extends AbstractRector { /** * @readonly * @var \Rector\DeadCode\NodeAnalyzer\IsClassMethodUsedAnalyzer */ private $isClassMethodUsedAnalyzer; /** * @readonly * @var \Rector\Core\Reflection\ReflectionResolver */ private $reflectionResolver; public function __construct(IsClassMethodUsedAnalyzer $isClassMethodUsedAnalyzer, ReflectionResolver $reflectionResolver) { $this->isClassMethodUsedAnalyzer = $isClassMethodUsedAnalyzer; $this->reflectionResolver = $reflectionResolver; } public function getRuleDefinition() : RuleDefinition { return new RuleDefinition('Remove unused private method', [new CodeSample(<<<'CODE_SAMPLE' final class SomeController { public function run() { return 5; } private function skip() { return 10; } } CODE_SAMPLE , <<<'CODE_SAMPLE' final class SomeController { public function run() { return 5; } } CODE_SAMPLE )]); } /** * @return array<class-string<Node>> */ public function getNodeTypes() : array { return [ClassMethod::class]; } /** * @param ClassMethod $node */ public function refactor(Node $node) : ?Node { if ($this->shouldSkip($node)) { return null; } if ($this->isClassMethodUsedAnalyzer->isClassMethodUsed($node)) { return null; } if ($this->hasDynamicMethodCallOnFetchThis($node)) { return null; } $this->removeNode($node); return $node; } private function shouldSkip(ClassMethod $classMethod) : bool { $classReflection = $this->reflectionResolver->resolveClassReflection($classMethod); if (!$classReflection instanceof ClassReflection) { return \true; } // unreliable to detect trait, interface doesn't make sense if ($classReflection->isTrait()) { return \true; } if ($classReflection->isInterface()) { return \true; } if ($classReflection->isAnonymous()) { return \true; } // skips interfaces by default too if (!$classMethod->isPrivate()) { return \true; } // skip magic methods - @see https://www.php.net/manual/en/language.oop5.magic.php if ($classMethod->isMagic()) { return \true; } return $classReflection->hasMethod(MethodName::CALL); } private function hasDynamicMethodCallOnFetchThis(ClassMethod $classMethod) : bool { $class = $this->betterNodeFinder->findParentType($classMethod, Class_::class); if (!$class instanceof Class_) { return \false; } foreach ($class->getMethods() as $method) { $isFound = (bool) $this->betterNodeFinder->findFirst((array) $method->getStmts(), function (Node $subNode) : bool { if (!$subNode instanceof MethodCall) { return \false; } if (!$subNode->var instanceof Variable) { return \false; } if (!$this->nodeNameResolver->isName($subNode->var, 'this')) { return \false; } return $subNode->name instanceof Variable; }); if ($isFound) { return \true; } } return \false; } }
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