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Filename :
PureFunctionDetector.php
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<?php declare (strict_types=1); namespace Rector\DeadCode\SideEffect; use PhpParser\Node\Expr\FuncCall; use PhpParser\Node\Name; use PHPStan\Analyser\Scope; use PHPStan\Reflection\Native\NativeFunctionReflection; use PHPStan\Reflection\ReflectionProvider; use Rector\NodeNameResolver\NodeNameResolver; final class PureFunctionDetector { /** * @readonly * @var \Rector\NodeNameResolver\NodeNameResolver */ private $nodeNameResolver; /** * @readonly * @var \PHPStan\Reflection\ReflectionProvider */ private $reflectionProvider; public function __construct(NodeNameResolver $nodeNameResolver, ReflectionProvider $reflectionProvider) { $this->nodeNameResolver = $nodeNameResolver; $this->reflectionProvider = $reflectionProvider; } public function detect(FuncCall $funcCall, Scope $scope) : bool { $funcCallName = $this->nodeNameResolver->getName($funcCall); if ($funcCallName === null) { return \false; } $name = new Name($funcCallName); $hasFunction = $this->reflectionProvider->hasFunction($name, $scope); if (!$hasFunction) { return \false; } $functionReflection = $this->reflectionProvider->getFunction($name, $scope); if (!$functionReflection instanceof NativeFunctionReflection) { return \false; } // yes() and maybe() may have side effect return $functionReflection->hasSideEffects()->no(); } }