Support root-namespace parent classes

src/NodeVisitor/ParentClassNameCollectingNodeVisitor.php

@@ -40,10 +40,19 @@ public function getParentClassNames(): array
         sort($uniqueParentClassNames);
 
         // remove native classes
-        $namespacedClassNames = array_filter(
-            $uniqueParentClassNames,
-            fn (string $parentClassName): bool => str_contains($parentClassName, '\\')
-        );
+        $namespacedClassNames = [];
+        foreach($uniqueParentClassNames as $className) {
+            try {
+                // @phpstan-ignore-next-line
+                $reflectionClass = new \ReflectionClass($className);
+                if ($reflectionClass->isInternal()) {
+                    continue;
+                }
+                $namespacedClassNames[] = $className;
+            } catch (\ReflectionException $e) {
+                $namespacedClassNames[] = $className;
+            }
+        }
 
         // remove obviously vendor names
         $namespacedClassNames = array_filter($namespacedClassNames, function (string $className): bool {

tests/ParentClassResolver/Fixture/SomeClassWithInternalParent.php

@@ -0,0 +1,9 @@
+<?php
+
+declare(strict_types=1);
+
+namespace TomasVotruba\Finalize\Tests\ParentClassResolver\Fixture;
+
+final class SomeClassWithInternalParent extends \ArrayObject
+{
+}

tests/ParentClassResolver/Fixture/SomeClassWithRootNamespaceParent.php

@@ -0,0 +1,9 @@
+<?php
+
+declare(strict_types=1);
+
+namespace TomasVotruba\Finalize\Tests\ParentClassResolver\Fixture;
+
+final class SomeClassWithRootNamespaceParent extends \SomeUnknownRootNamespaceClass
+{
+}

tests/ParentClassResolver/ParentClassResolverTest.php

@@ -29,6 +29,9 @@ public function test(): void
         $parentClassNames = $this->parentClassResolver->resolve($phpFileInfos, function () {
         });
 
-        $this->assertSame([SomeParentClass::class], $parentClassNames);
+        $this->assertSame([
+            \SomeUnknownRootNamespaceClass::class, // @phpstan-ignore-line
+            SomeParentClass::class
+        ], $parentClassNames);
     }
 }