Improve no single interface

config/code-complexity-rules.neon

@@ -13,3 +13,8 @@ services:
         class: Symplify\PHPStanRules\Collector\ImplementedInterfaceCollector
         tags:
             - phpstan.collector
+
+    -
+        class: Symplify\PHPStanRules\Collector\InterfaceOfAbstractClassCollector
+        tags:
+            - phpstan.collector

config/services/services.neon

@@ -1,6 +1,4 @@
 services:
-    - PhpParser\NodeFinder
-
     - Symplify\PHPStanRules\NodeTraverser\SimpleCallableNodeTraverser
     - Symplify\PHPStanRules\PhpDocParser\PhpDocNodeTraverser
     - Symplify\PHPStanRules\Reflection\ReflectionParser

src/Collector/InterfaceOfAbstractClassCollector.php

@@ -0,0 +1,37 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Symplify\PHPStanRules\Collector;
+
+use PhpParser\Node;
+use PhpParser\Node\Stmt\Class_;
+use PHPStan\Analyser\Scope;
+use PHPStan\Collectors\Collector;
+
+final class InterfaceOfAbstractClassCollector implements Collector
+{
+    public function getNodeType(): string
+    {
+        return Class_::class;
+    }
+
+    /**
+     * @param Class_ $node
+     * @return string[]|null
+     */
+    public function processNode(Node $node, Scope $scope): ?array
+    {
+        if (! $node->isAbstract()) {
+            return null;
+        }
+
+        $interfaceNames = [];
+
+        foreach ($node->implements as $implement) {
+            $interfaceNames[] = $implement->toString();
+        }
+
+        return $interfaceNames;
+    }
+}

src/NodeFinder/TypeAwareNodeFinder.php

@@ -12,9 +12,11 @@
  */
 final class TypeAwareNodeFinder
 {
-    public function __construct(
-        private readonly NodeFinder $nodeFinder
-    ) {
+    private readonly NodeFinder $nodeFinder;
+
+    public function __construct()
+    {
+        $this->nodeFinder = new NodeFinder();
     }
 
     /**

src/Rules/ForbiddenMultipleClassLikeInOneFileRule.php

@@ -25,9 +25,11 @@ final class ForbiddenMultipleClassLikeInOneFileRule implements Rule, DocumentedR
      */
     public const ERROR_MESSAGE = 'Multiple class/interface/trait is not allowed in single file';
 
+    private readonly NodeFinder $nodeFinder;
+
     public function __construct(
-        private readonly NodeFinder $nodeFinder
     ) {
+        $this->nodeFinder = new NodeFinder();
     }
 
     /**

src/Rules/NoSingleInterfaceImplementerRule.php

@@ -13,6 +13,7 @@
 use PHPStan\Rules\RuleErrorBuilder;
 use Symplify\PHPStanRules\Collector\ImplementedInterfaceCollector;
 use Symplify\PHPStanRules\Collector\InterfaceCollector;
+use Symplify\PHPStanRules\Collector\InterfaceOfAbstractClassCollector;
 use Symplify\RuleDocGenerator\Contract\DocumentedRuleInterface;
 use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample;
 use Symplify\RuleDocGenerator\ValueObject\RuleDefinition;
@@ -45,10 +46,14 @@ public function processNode(Node $node, Scope $scope): array
     {
         $implementedInterfaces = Arrays::flatten($node->get(ImplementedInterfaceCollector::class));
         $interfaces = Arrays::flatten($node->get(InterfaceCollector::class));
+        $interfacesOfAbstractClass = Arrays::flatten($node->get(InterfaceOfAbstractClassCollector::class));
 
         $onceUsedInterfaces = $this->resolveOnceUsedInterfaces($implementedInterfaces);
-
         $onceImplementedInterfaces = array_intersect($onceUsedInterfaces, $interfaces);
+
+        // remove the abstract class implemented, as required transitionally
+        $onceImplementedInterfaces = array_diff($onceImplementedInterfaces, $interfacesOfAbstractClass);
+
         if ($onceImplementedInterfaces === []) {
             return [];
         }

tests/Rules/NoSingleInterfaceImplementerRule/NoSingleInterfaceImplementerRuleTest.php

@@ -10,6 +10,7 @@
 use PHPUnit\Framework\Attributes\DataProvider;
 use Symplify\PHPStanRules\Collector\ImplementedInterfaceCollector;
 use Symplify\PHPStanRules\Collector\InterfaceCollector;
+use Symplify\PHPStanRules\Collector\InterfaceOfAbstractClassCollector;
 use Symplify\PHPStanRules\Rules\NoSingleInterfaceImplementerRule;
 use Symplify\PHPStanRules\Tests\Rules\NoSingleInterfaceImplementerRule\Fixture\SimpleInterface;
 
@@ -33,6 +34,9 @@ public static function provideData(): Iterator
         yield [[__DIR__ . '/Fixture/SimpleInterface.php'], []];
         yield [[__DIR__ . '/Fixture/AllowAbstract.php', __DIR__ . '/Fixture/SimpleInterface.php'], []];
 
+        // already counted in abstract class
+        yield [[__DIR__ . '/Fixture/AllowAbstract.php', __DIR__ . '/Fixture/SimpleInterface.php', __DIR__ . '/Fixture/ImplementsSimpleInterface.php'], []];
+
         yield [
             [
                 __DIR__ . '/Fixture/SimpleInterface.php',
@@ -58,6 +62,7 @@ protected function getCollectors(): array
         return [
             self::getContainer()->getByType(ImplementedInterfaceCollector::class),
             self::getContainer()->getByType(InterfaceCollector::class),
+            self::getContainer()->getByType(InterfaceOfAbstractClassCollector::class),
         ];
     }
 

tests/Rules/NoSingleInterfaceImplementerRule/config/configured_rule.neon

@@ -1,13 +1,3 @@
-rules:
-    - Symplify\PHPStanRules\Rules\NoSingleInterfaceImplementerRule
-
-services:
-    -
-        class: Symplify\PHPStanRules\Collector\InterfaceCollector
-        tags:
-            - phpstan.collector
-
-    -
-        class: Symplify\PHPStanRules\Collector\ImplementedInterfaceCollector
-        tags:
-            - phpstan.collector
+includes:
+    - ../../../../config/code-complexity-rules.neon
+    - ../../../../config/services/services.neon