From 879faa0cb54c73a6abc700ec94a335ad396e82c0 Mon Sep 17 00:00:00 2001
From: janmohr <259855742+janwaleed09@users.noreply.github.com>
Date: Thu, 1 Oct 2026 07:10:48 +0200
Subject: [PATCH] [Performance] Resolve class-like names once per file version
 in ShortNameResolver

---
 .../ShortNameResolverTest.php                 | 28 +++++++++++++++++++
 .../ClassNameImport/ShortNameResolver.php     | 26 +++++++++++++++++
 src/ValueObject/Application/File.php          | 11 ++++++++
 3 files changed, 65 insertions(+)

diff --git a/rules-tests/CodingStyle/ClassNameImport/ShortNameResolver/ShortNameResolverTest.php b/rules-tests/CodingStyle/ClassNameImport/ShortNameResolver/ShortNameResolverTest.php
index 1931d75e3ff..504f5b6679a 100644
--- a/rules-tests/CodingStyle/ClassNameImport/ShortNameResolver/ShortNameResolverTest.php
+++ b/rules-tests/CodingStyle/ClassNameImport/ShortNameResolver/ShortNameResolverTest.php
@@ -5,6 +5,9 @@
 namespace Rector\Tests\CodingStyle\ClassNameImport\ShortNameResolver;
 
 use Iterator;
+use PhpParser\Node\Identifier;
+use PhpParser\Node\Stmt\Class_;
+use PhpParser\NodeFinder;
 use PHPUnit\Framework\Attributes\DataProvider;
 use Rector\CodingStyle\ClassNameImport\ShortNameResolver;
 use Rector\Testing\PHPUnit\AbstractLazyTestCase;
@@ -36,6 +39,31 @@ public function test(string $filePath, array $expectedShortNames): void
         $this->assertSame($expectedShortNames, $shortNames);
     }
 
+    public function testResolveShortClassLikeNamesAgainAfterStmtsChange(): void
+    {
+        $file = $this->testingParser->parseFilePathToFile(__DIR__ . '/Fixture/various_imports.php.inc');
+        $this->assertSame(['VariousImports'], $this->shortNameResolver->resolveShortClassLikeNames($file));
+
+        $class = new NodeFinder()
+            ->findFirstInstanceOf($file->getNewStmts(), Class_::class);
+        $this->assertInstanceOf(Class_::class, $class);
+
+        $class->name = new Identifier('RenamedClass');
+        $file->changeNewStmts($file->getNewStmts());
+
+        $this->assertSame(['RenamedClass'], $this->shortNameResolver->resolveShortClassLikeNames($file));
+    }
+
+    public function testResolveShortClassLikeNamesPerFile(): void
+    {
+        $firstFile = $this->testingParser->parseFilePathToFile(__DIR__ . '/Fixture/various_imports.php.inc');
+        $secondFile = $this->testingParser->parseFilePathToFile(__DIR__ . '/Fixture/partial_names.php.inc');
+
+        $this->assertSame(['VariousImports'], $this->shortNameResolver->resolveShortClassLikeNames($firstFile));
+        $this->assertSame(['PartialNames'], $this->shortNameResolver->resolveShortClassLikeNames($secondFile));
+        $this->assertSame(['VariousImports'], $this->shortNameResolver->resolveShortClassLikeNames($firstFile));
+    }
+
     /**
      * @return Iterator<array<array<int, mixed>, mixed>>
      */
diff --git a/rules/CodingStyle/ClassNameImport/ShortNameResolver.php b/rules/CodingStyle/ClassNameImport/ShortNameResolver.php
index 7b53fab2602..871833c6aff 100644
--- a/rules/CodingStyle/ClassNameImport/ShortNameResolver.php
+++ b/rules/CodingStyle/ClassNameImport/ShortNameResolver.php
@@ -31,6 +31,15 @@ final class ShortNameResolver
      */
     private array $shortNamesByFilePath = [];
 
+    private ?File $shortClassLikeNamesFile = null;
+
+    private int $shortClassLikeNamesVersion = 0;
+
+    /**
+     * @var string[]
+     */
+    private array $shortClassLikeNames = [];
+
     public function __construct(
         private readonly SimpleCallableNodeTraverser $simpleCallableNodeTraverser,
         private readonly NodeNameResolver $nodeNameResolver,
@@ -62,6 +71,23 @@ public function resolveFromFile(File $file): array
      * @return string[]
      */
     public function resolveShortClassLikeNames(File $file): array
+    {
+        // asked for every imported name, while the class-likes only change with a new version of the file stmts
+        if ($file === $this->shortClassLikeNamesFile && $file->getNewStmtsVersion() === $this->shortClassLikeNamesVersion) {
+            return $this->shortClassLikeNames;
+        }
+
+        $this->shortClassLikeNamesFile = $file;
+        $this->shortClassLikeNamesVersion = $file->getNewStmtsVersion();
+        $this->shortClassLikeNames = $this->findShortClassLikeNames($file);
+
+        return $this->shortClassLikeNames;
+    }
+
+    /**
+     * @return string[]
+     */
+    private function findShortClassLikeNames(File $file): array
     {
         $rootNode = $file->getUseImportsRootNode();
 
diff --git a/src/ValueObject/Application/File.php b/src/ValueObject/Application/File.php
index 33c354d4a05..ca87c687614 100644
--- a/src/ValueObject/Application/File.php
+++ b/src/ValueObject/Application/File.php
@@ -33,6 +33,8 @@ final class File
      */
     private array $newStmts = [];
 
+    private int $newStmtsVersion = 0;
+
     /**
      * @var array<int, Token>
      */
@@ -146,6 +148,15 @@ public function getOldTokens(): array
     public function changeNewStmts(array $newStmts): void
     {
         $this->newStmts = $newStmts;
+        ++$this->newStmtsVersion;
+    }
+
+    /**
+     * Increases with every change of the new stmts, so data derived from them can be cached per version
+     */
+    public function getNewStmtsVersion(): int
+    {
+        return $this->newStmtsVersion;
     }
 
     public function addRectorClassWithLine(RectorWithLineChange $rectorWithLineChange): void