[B/C Break] Make the Annotations package optional in the builder API

composer.json

@@ -23,7 +23,6 @@
     ],
     "require": {
         "php": "^7.4 || ^8.0",
-        "doctrine/annotations": "^1.14 || ^2.0",
         "doctrine/instantiator": "^1.3.1 || ^2.0",
         "doctrine/lexer": "^2.0 || ^3.0",
         "jms/metadata": "^2.6",
@@ -37,6 +36,7 @@
     },
     "require-dev": {
         "ext-pdo_sqlite": "*",
+        "doctrine/annotations": "^1.14 || ^2.0",
         "doctrine/coding-standard": "^12.0",
         "doctrine/orm": "^2.14 || ^3.0",
         "doctrine/persistence": "^2.5.2 || ^3.0",

src/Builder/CallbackDriverFactory.php

@@ -12,15 +12,19 @@ final class CallbackDriverFactory implements DriverFactoryInterface
 {
     /**
      * @var callable
+     * @phpstan-var callable(array $metadataDirs, Reader|null $reader): DriverInterface
      */
     private $callback;
 
+    /**
+     * @phpstan-param callable(array $metadataDirs, Reader|null $reader): DriverInterface $callable
+     */
     public function __construct(callable $callable)
     {
         $this->callback = $callable;
     }
 
-    public function createDriver(array $metadataDirs, Reader $reader): DriverInterface
+    public function createDriver(array $metadataDirs, ?Reader $reader = null): DriverInterface
     {
         $driver = \call_user_func($this->callback, $metadataDirs, $reader);
         if (!$driver instanceof DriverInterface) {

src/Builder/DefaultDriverFactory.php

@@ -5,6 +5,7 @@
 namespace JMS\Serializer\Builder;
 
 use Doctrine\Common\Annotations\Reader;
+use JMS\Serializer\Exception\RuntimeException;
 use JMS\Serializer\Expression\CompilableExpressionEvaluatorInterface;
 use JMS\Serializer\Metadata\Driver\AnnotationOrAttributeDriver;
 use JMS\Serializer\Metadata\Driver\DefaultValuePropertyDriver;
@@ -55,8 +56,12 @@ public function enableEnumSupport(bool $enableEnumSupport = true): void
         $this->enableEnumSupport = $enableEnumSupport;
     }
 
-    public function createDriver(array $metadataDirs, Reader $annotationReader): DriverInterface
+    public function createDriver(array $metadataDirs, ?Reader $annotationReader = null): DriverInterface
     {
+        if (PHP_VERSION_ID < 80000 && empty($metadataDirs) && !interface_exists(Reader::class)) {
+            throw new RuntimeException(sprintf('To use "%s", either a list of metadata directories must be provided, the "doctrine/annotations" package installed, or use PHP 8.0 or later.', self::class));
+        }
+
         /*
          * Build the sorted list of metadata drivers based on the environment. The final order should be:
          *
@@ -65,7 +70,11 @@ public function createDriver(array $metadataDirs, Reader $annotationReader): Dri
          * - Annotations/Attributes Driver
          * - Null (Fallback) Driver
          */
-        $metadataDrivers = [new AnnotationOrAttributeDriver($this->propertyNamingStrategy, $this->typeParser, $this->expressionEvaluator, $annotationReader)];
+        $metadataDrivers = [];
+
+        if (PHP_VERSION_ID >= 80000 || $annotationReader instanceof Reader) {
+            $metadataDrivers[] = new AnnotationOrAttributeDriver($this->propertyNamingStrategy, $this->typeParser, $this->expressionEvaluator, $annotationReader);
+        }
 
         if (!empty($metadataDirs)) {
             $fileLocator = new FileLocator($metadataDirs);

src/Builder/DocBlockDriverFactory.php

@@ -26,7 +26,7 @@ public function __construct(DriverFactoryInterface $driverFactoryToDecorate, ?Pa
         $this->typeParser = $typeParser;
     }
 
-    public function createDriver(array $metadataDirs, Reader $annotationReader): DriverInterface
+    public function createDriver(array $metadataDirs, ?Reader $annotationReader = null): DriverInterface
     {
         $driver = $this->driverFactoryToDecorate->createDriver($metadataDirs, $annotationReader);
 

src/Builder/DriverFactoryInterface.php

@@ -9,5 +9,5 @@
 
 interface DriverFactoryInterface
 {
-    public function createDriver(array $metadataDirs, Reader $annotationReader): DriverInterface;
+    public function createDriver(array $metadataDirs, ?Reader $annotationReader = null): DriverInterface;
 }

src/SerializerBuilder.php

@@ -552,9 +552,8 @@ public function setDocBlockTypeResolver(bool $docBlockTypeResolver): self
     public function build(): Serializer
     {
         $annotationReader = $this->annotationReader;
-        if (null === $annotationReader) {
-            $annotationReader = new AnnotationReader();
-            $annotationReader = $this->decorateAnnotationReader($annotationReader);
+        if (null === $annotationReader && class_exists(AnnotationReader::class)) {
+            $annotationReader = $this->decorateAnnotationReader(new AnnotationReader());
         }
 
         if (null === $this->driverFactory) {