[container] don't report service constructors as PossiblyUnusedMethod (#326)

Author: seferov

src/Handler/ContainerHandler.php

@@ -11,9 +11,11 @@
 use Psalm\Plugin\EventHandler\AfterClassLikeVisitInterface;
 use Psalm\Plugin\EventHandler\AfterCodebasePopulatedInterface;
 use Psalm\Plugin\EventHandler\AfterMethodCallAnalysisInterface;
+use Psalm\Plugin\EventHandler\BeforeAddIssueInterface;
 use Psalm\Plugin\EventHandler\Event\AfterClassLikeVisitEvent;
 use Psalm\Plugin\EventHandler\Event\AfterCodebasePopulatedEvent;
 use Psalm\Plugin\EventHandler\Event\AfterMethodCallAnalysisEvent;
+use Psalm\Plugin\EventHandler\Event\BeforeAddIssueEvent;
 use Psalm\SymfonyPsalmPlugin\Issue\NamingConventionViolation;
 use Psalm\SymfonyPsalmPlugin\Issue\PrivateService;
 use Psalm\SymfonyPsalmPlugin\Issue\ServiceNotFound;
@@ -22,7 +24,7 @@
 use Psalm\Type\Union;
 use Symfony\Component\DependencyInjection\Exception\ServiceNotFoundException;
 
-class ContainerHandler implements AfterMethodCallAnalysisInterface, AfterClassLikeVisitInterface, AfterCodebasePopulatedInterface
+class ContainerHandler implements AfterMethodCallAnalysisInterface, AfterClassLikeVisitInterface, AfterCodebasePopulatedInterface, BeforeAddIssueInterface
 {
     private const GET_CLASSLIKES = [
         'Psr\Container\ContainerInterface',
@@ -38,9 +40,18 @@ class ContainerHandler implements AfterMethodCallAnalysisInterface, AfterClassLi
      */
     private static $containerMeta;
 
+    /**
+     * @var array<string> collection of cower-cased class names that are present in the container
+     */
+    private static array $containerClassNames = [];
+
     public static function init(ContainerMeta $containerMeta): void
     {
         self::$containerMeta = $containerMeta;
+
+        self::$containerClassNames = array_map(function (string $className): string {
+            return strtolower($className);
+        }, self::$containerMeta->getClassNames());
     }
 
     public static function afterMethodCallAnalysis(AfterMethodCallAnalysisEvent $event): void
@@ -173,17 +184,27 @@ public static function afterCodebasePopulated(AfterCodebasePopulatedEvent $event
             return;
         }
 
-        $containerClassNames = array_map(function (string $className): string {
-            return strtolower($className);
-        }, self::$containerMeta->getClassNames());
-
         foreach ($event->getCodebase()->classlike_storage_provider->getAll() as $name => $storage) {
-            if (in_array($name, $containerClassNames, true)) {
+            if (in_array($name, self::$containerClassNames, true)) {
                 $storage->suppressed_issues[] = 'UnusedClass';
             }
         }
     }
 
+    public static function beforeAddIssue(BeforeAddIssueEvent $event): ?bool
+    {
+        $data = $event->getIssue()->toIssueData('error');
+        if ('PossiblyUnusedMethod' === $data->type
+            && '__construct' === $data->selected_text
+            && null !== $data->dupe_key
+            && in_array(preg_replace('/::__construct$/', '', $data->dupe_key), self::$containerClassNames, true)) {
+            // Don't report service constructors as PossiblyUnusedMethod
+            return false;
+        }
+
+        return null;
+    }
+
     public static function isContainerMethod(string $declaringMethodId, string $methodName): bool
     {
         return in_array(