diff --git a/src/Handler/TextDocumentSyncHandler.php b/src/Handler/TextDocumentSyncHandler.php
index 72177bcc..98c765d6 100644
--- a/src/Handler/TextDocumentSyncHandler.php
+++ b/src/Handler/TextDocumentSyncHandler.php
@@ -5,13 +5,9 @@
 namespace Firehed\PhpLsp\Handler;
 
 use Firehed\PhpLsp\Document\DocumentManager;
-use Firehed\PhpLsp\Index\DocumentIndexer;
-use Firehed\PhpLsp\Parser\ParserService;
+use Firehed\PhpLsp\Document\TextDocument;
+use Firehed\PhpLsp\Knowledge\SymbolSink;
 use Firehed\PhpLsp\Protocol\Message;
-use Firehed\PhpLsp\Repository\ClassInfoFactory;
-use Firehed\PhpLsp\Repository\ClassRepository;
-use Firehed\PhpLsp\Utility\ScopeFinder;
-use PhpParser\Node\Stmt;
 
 final class TextDocumentSyncHandler implements HandlerInterface
 {
@@ -23,10 +19,7 @@ final class TextDocumentSyncHandler implements HandlerInterface
 
     public function __construct(
         private readonly DocumentManager $documentManager,
-        private readonly ParserService $parser,
-        private readonly ClassRepository $classRepository,
-        private readonly ClassInfoFactory $classInfoFactory,
-        private readonly DocumentIndexer $indexer,
+        private readonly SymbolSink $symbols,
     ) {
     }
 
@@ -66,7 +59,7 @@ private function handleDidOpen(array $params): null
         assert(is_string($text));
 
         $this->documentManager->open($uri, $languageId, $version, $text);
-        $this->indexDocument($uri);
+        $this->symbols->openDocument($this->documentFor($uri));
 
         return null;
     }
@@ -93,7 +86,7 @@ private function handleDidChange(array $params): null
         if (is_array($lastChange) && isset($lastChange['text'])) {
             assert(is_string($lastChange['text']));
             $this->documentManager->update($uri, $lastChange['text'], $version);
-            $this->indexDocument($uri);
+            $this->symbols->updateDocument($this->documentFor($uri));
         }
 
         return null;
@@ -110,37 +103,17 @@ private function handleDidClose(array $params): null
         $uri = $textDocument['uri'] ?? '';
         assert(is_string($uri));
 
-        $this->indexer->remove($uri);
-        $this->classRepository->removeDocument($uri);
+        $this->symbols->closeDocument($uri);
         $this->documentManager->close($uri);
 
         return null;
     }
 
-    private function indexDocument(string $uri): void
+    private function documentFor(string $uri): TextDocument
     {
         $document = $this->documentManager->get($uri);
         assert($document !== null);
 
-        $ast = $this->parser->parse($document);
-        if ($ast !== null) {
-            $this->registerDocumentClasses($uri, $ast);
-        }
-
-        $this->indexer->index($document);
-    }
-
-    /**
-     * @param array<Stmt> $ast
-     */
-    private function registerDocumentClasses(string $uri, array $ast): void
-    {
-        $classes = [];
-        foreach (ScopeFinder::iterateTopLevelStatements($ast) as $stmt) {
-            if ($stmt instanceof Stmt\ClassLike && $stmt->name !== null) {
-                $classes[] = $this->classInfoFactory->fromAstNode($stmt, $uri);
-            }
-        }
-        $this->classRepository->updateDocument($uri, $classes);
+        return $document;
     }
 }
diff --git a/src/Server.php b/src/Server.php
index 7512c8ff..7af56dee 100644
--- a/src/Server.php
+++ b/src/Server.php
@@ -126,10 +126,7 @@ public static function forProject(
         $handlers = [
             new TextDocumentSyncHandler(
                 $documentManager,
-                $parser,
-                $classRepository,
-                $classInfoFactory,
-                $indexer,
+                $symbolSource,
             ),
             new DefinitionHandler(
                 $documentManager,
diff --git a/tests/Handler/CompletionHandlerTest.php b/tests/Handler/CompletionHandlerTest.php
index 3b160bd4..1b1c4bd4 100644
--- a/tests/Handler/CompletionHandlerTest.php
+++ b/tests/Handler/CompletionHandlerTest.php
@@ -100,10 +100,14 @@ protected function setUp(): void
         $this->handler = $this->makeHandler($this->catalog);
         $this->syncHandler = new TextDocumentSyncHandler(
             $this->documents,
-            $this->parser,
-            $this->classRepository,
-            $this->classInfoFactory,
-            $this->indexer,
+            new DelegatingSymbolSource(
+                $this->classRepository,
+                $this->symbolIndex,
+                $this->catalog,
+                $this->indexer,
+                $this->classInfoFactory,
+                $this->parser,
+            ),
         );
     }
 
diff --git a/tests/Handler/DefinitionHandlerTest.php b/tests/Handler/DefinitionHandlerTest.php
index 6458571c..3ba74c17 100644
--- a/tests/Handler/DefinitionHandlerTest.php
+++ b/tests/Handler/DefinitionHandlerTest.php
@@ -7,9 +7,6 @@
 use Firehed\PhpLsp\Document\DocumentManager;
 use Firehed\PhpLsp\Handler\DefinitionHandler;
 use Firehed\PhpLsp\Handler\TextDocumentSyncHandler;
-use Firehed\PhpLsp\Index\DocumentIndexer;
-use Firehed\PhpLsp\Index\SymbolExtractor;
-use Firehed\PhpLsp\Index\SymbolIndex;
 use Firehed\PhpLsp\Parser\ParserService;
 use Firehed\PhpLsp\Protocol\RequestMessage;
 use Firehed\PhpLsp\Repository\ClassLocator;
@@ -48,9 +45,10 @@ protected function setUp(): void
         );
         $memberResolver = new MemberResolver($this->classRepository);
         $typeResolver = new BasicTypeResolver($memberResolver, new DefaultFunctionRepository());
+        $symbolSource = $this->symbolSourceFor($this->classRepository, $this->parser);
         $symbolResolver = new SymbolResolver(
             $this->parser,
-            $this->symbolSourceFor($this->classRepository, $this->parser),
+            $symbolSource,
             $memberResolver,
             $typeResolver,
             new DefaultFunctionRepository(),
@@ -59,13 +57,9 @@ protected function setUp(): void
             $this->documents,
             $symbolResolver,
         );
-        $indexer = new DocumentIndexer($this->parser, new SymbolExtractor(), new SymbolIndex());
         $this->syncHandler = new TextDocumentSyncHandler(
             $this->documents,
-            $this->parser,
-            $this->classRepository,
-            $classInfoFactory,
-            $indexer,
+            $symbolSource,
         );
     }
 
diff --git a/tests/Handler/HoverHandlerTest.php b/tests/Handler/HoverHandlerTest.php
index 507ee2af..cb7f6eaa 100644
--- a/tests/Handler/HoverHandlerTest.php
+++ b/tests/Handler/HoverHandlerTest.php
@@ -9,9 +9,6 @@
 use Firehed\PhpLsp\Document\DocumentManager;
 use Firehed\PhpLsp\Handler\HoverHandler;
 use Firehed\PhpLsp\Handler\TextDocumentSyncHandler;
-use Firehed\PhpLsp\Index\DocumentIndexer;
-use Firehed\PhpLsp\Index\SymbolExtractor;
-use Firehed\PhpLsp\Index\SymbolIndex;
 use Firehed\PhpLsp\Parser\ParserService;
 use Firehed\PhpLsp\Protocol\MarkupKind;
 use Firehed\PhpLsp\Protocol\NotificationMessage;
@@ -54,9 +51,10 @@ protected function setUp(): void
         );
         $memberResolver = new MemberResolver($this->classRepository);
         $typeResolver = new BasicTypeResolver($memberResolver, new DefaultFunctionRepository());
+        $symbolSource = $this->symbolSourceFor($this->classRepository, $this->parser);
         $this->symbolResolver = new SymbolResolver(
             $this->parser,
-            $this->symbolSourceFor($this->classRepository, $this->parser),
+            $symbolSource,
             $memberResolver,
             $typeResolver,
             new DefaultFunctionRepository(),
@@ -65,13 +63,9 @@ protected function setUp(): void
         // minimal client is served); the fenced-markdown path is exercised
         // explicitly below.
         $this->handler = $this->handlerFor(MarkupKind::PlainText);
-        $indexer = new DocumentIndexer($this->parser, new SymbolExtractor(), new SymbolIndex());
         $this->syncHandler = new TextDocumentSyncHandler(
             $this->documents,
-            $this->parser,
-            $this->classRepository,
-            $this->classInfoFactory,
-            $indexer,
+            $symbolSource,
         );
     }
 
diff --git a/tests/Handler/SignatureHelpHandlerTest.php b/tests/Handler/SignatureHelpHandlerTest.php
index 82c867f1..c3a9c809 100644
--- a/tests/Handler/SignatureHelpHandlerTest.php
+++ b/tests/Handler/SignatureHelpHandlerTest.php
@@ -8,9 +8,6 @@
 use Firehed\PhpLsp\Handler\SignatureHelpHandler;
 use Firehed\PhpLsp\Handler\TextDocumentSyncHandler;
 use Firehed\PhpLsp\Index\ComposerClassLocator;
-use Firehed\PhpLsp\Index\DocumentIndexer;
-use Firehed\PhpLsp\Index\SymbolExtractor;
-use Firehed\PhpLsp\Index\SymbolIndex;
 use Firehed\PhpLsp\Parser\ParserService;
 use Firehed\PhpLsp\Repository\DefaultClassInfoFactory;
 use Firehed\PhpLsp\Repository\DefaultClassRepository;
@@ -49,9 +46,10 @@ protected function setUp(): void
         );
         $this->memberResolver = new MemberResolver($this->classRepository);
         $typeResolver = new BasicTypeResolver($this->memberResolver, new DefaultFunctionRepository());
+        $symbolSource = $this->symbolSourceFor($this->classRepository, $this->parser);
         $symbolResolver = new SymbolResolver(
             $this->parser,
-            $this->symbolSourceFor($this->classRepository, $this->parser),
+            $symbolSource,
             $this->memberResolver,
             $typeResolver,
             new DefaultFunctionRepository(),
@@ -60,13 +58,9 @@ protected function setUp(): void
             $this->documents,
             $symbolResolver,
         );
-        $indexer = new DocumentIndexer($this->parser, new SymbolExtractor(), new SymbolIndex());
         $this->syncHandler = new TextDocumentSyncHandler(
             $this->documents,
-            $this->parser,
-            $this->classRepository,
-            $this->classInfoFactory,
-            $indexer,
+            $symbolSource,
         );
     }
 
diff --git a/tests/Handler/TextDocumentSyncHandlerTest.php b/tests/Handler/TextDocumentSyncHandlerTest.php
index e8292447..387c62f9 100644
--- a/tests/Handler/TextDocumentSyncHandlerTest.php
+++ b/tests/Handler/TextDocumentSyncHandlerTest.php
@@ -7,14 +7,12 @@
 use Firehed\PhpLsp\Document\DocumentManager;
 use Firehed\PhpLsp\Domain\ClassName;
 use Firehed\PhpLsp\Handler\TextDocumentSyncHandler;
-use Firehed\PhpLsp\Index\DocumentIndexer;
-use Firehed\PhpLsp\Index\SymbolExtractor;
-use Firehed\PhpLsp\Index\SymbolIndex;
 use Firehed\PhpLsp\Parser\ParserService;
 use Firehed\PhpLsp\Protocol\NotificationMessage;
 use Firehed\PhpLsp\Repository\ClassLocator;
 use Firehed\PhpLsp\Repository\DefaultClassInfoFactory;
 use Firehed\PhpLsp\Repository\DefaultClassRepository;
+use Firehed\PhpLsp\Tests\BuildsSymbolSourceTrait;
 use Firehed\PhpLsp\Tests\LoadsFixturesTrait;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\TestCase;
@@ -22,6 +20,7 @@
 #[CoversClass(TextDocumentSyncHandler::class)]
 class TextDocumentSyncHandlerTest extends TestCase
 {
+    use BuildsSymbolSourceTrait;
     use LoadsFixturesTrait;
 
     private DocumentManager $manager;
@@ -37,13 +36,9 @@ protected function setUp(): void
         $this->classInfoFactory = new DefaultClassInfoFactory();
         $locator = self::createStub(ClassLocator::class);
         $this->classRepository = new DefaultClassRepository($this->classInfoFactory, $locator, $this->parser);
-        $indexer = new DocumentIndexer($this->parser, new SymbolExtractor(), new SymbolIndex());
         $this->handler = new TextDocumentSyncHandler(
             $this->manager,
-            $this->parser,
-            $this->classRepository,
-            $this->classInfoFactory,
-            $indexer,
+            $this->symbolSourceFor($this->classRepository, $this->parser),
         );
     }
 
diff --git a/tests/Resolution/SymbolResolverTest.php b/tests/Resolution/SymbolResolverTest.php
index c15dccb6..3f100b7e 100644
--- a/tests/Resolution/SymbolResolverTest.php
+++ b/tests/Resolution/SymbolResolverTest.php
@@ -6,9 +6,6 @@
 
 use Firehed\PhpLsp\Document\DocumentManager;
 use Firehed\PhpLsp\Handler\TextDocumentSyncHandler;
-use Firehed\PhpLsp\Index\DocumentIndexer;
-use Firehed\PhpLsp\Index\SymbolExtractor;
-use Firehed\PhpLsp\Index\SymbolIndex;
 use Firehed\PhpLsp\Parser\ParserService;
 use Firehed\PhpLsp\Repository\ClassLocator;
 use Firehed\PhpLsp\Repository\DefaultClassInfoFactory;
@@ -72,11 +69,11 @@ protected function setUp(): void
         );
         $memberResolver = new MemberResolver($this->classRepository);
         $typeResolver = new BasicTypeResolver($memberResolver, new DefaultFunctionRepository());
-        $indexer = new DocumentIndexer($this->parser, new SymbolExtractor(), new SymbolIndex());
+        $symbolSource = $this->symbolSourceFor($this->classRepository, $this->parser);
 
         $this->resolver = new SymbolResolver(
             parser: $this->parser,
-            symbolSource: $this->symbolSourceFor($this->classRepository, $this->parser),
+            symbolSource: $symbolSource,
             memberResolver: $memberResolver,
             typeResolver: $typeResolver,
             functionRepository: new DefaultFunctionRepository(),
@@ -84,10 +81,7 @@ functionRepository: new DefaultFunctionRepository(),
 
         $this->syncHandler = new TextDocumentSyncHandler(
             $this->documents,
-            $this->parser,
-            $this->classRepository,
-            $classInfoFactory,
-            $indexer,
+            $symbolSource,
         );
     }