[DependencyInjection] add Autowire parameter attribute

Author: kbond

Attribute/Autowire.php

@@ -0,0 +1,50 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\DependencyInjection\Attribute;
+
+use Symfony\Component\DependencyInjection\Exception\LogicException;
+use Symfony\Component\DependencyInjection\Reference;
+use Symfony\Component\ExpressionLanguage\Expression;
+
+/**
+ * Attribute to tell a parameter how to be autowired.
+ *
+ * @author Kevin Bond <[email protected]>
+ */
+#[\Attribute(\Attribute::TARGET_PARAMETER)]
+class Autowire
+{
+    public readonly string|Expression|Reference $value;
+
+    /**
+     * Use only ONE of the following.
+     *
+     * @param string|null $service    Service ID (ie "some.service")
+     * @param string|null $expression Expression (ie 'service("some.service").someMethod()')
+     * @param string|null $value      Parameter value (ie "%kernel.project_dir%/some/path")
+     */
+    public function __construct(
+        ?string $service = null,
+        ?string $expression = null,
+        ?string $value = null
+    ) {
+        if (!($service xor $expression xor null !== $value)) {
+            throw new LogicException('#[Autowire] attribute must declare exactly one of $service, $expression, or $value.');
+        }
+
+        $this->value = match (true) {
+            null !== $service => new Reference($service),
+            null !== $expression => class_exists(Expression::class) ? new Expression($expression) : throw new LogicException('Unable to use expressions as the Symfony ExpressionLanguage component is not installed. Try running "composer require symfony/expression-language".'),
+            null !== $value => $value,
+        };
+    }
+}

CHANGELOG.md

@@ -7,6 +7,7 @@ CHANGELOG
  * Add `$exclude` to `TaggedIterator` and `TaggedLocator` attributes
  * Add `$exclude` to `tagged_iterator` and `tagged_locator` configurator
  * Add an `env` function to the expression language provider
+ * Add an `Autowire` attribute to tell a parameter how to be autowired
 
 6.0
 ---

Compiler/AutowirePass.php

@@ -14,14 +14,17 @@
 use Symfony\Component\Config\Resource\ClassExistenceResource;
 use Symfony\Component\DependencyInjection\Argument\ServiceLocatorArgument;
 use Symfony\Component\DependencyInjection\Argument\TaggedIteratorArgument;
+use Symfony\Component\DependencyInjection\Attribute\Autowire;
 use Symfony\Component\DependencyInjection\Attribute\TaggedIterator;
 use Symfony\Component\DependencyInjection\Attribute\TaggedLocator;
 use Symfony\Component\DependencyInjection\Attribute\Target;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\DependencyInjection\Definition;
 use Symfony\Component\DependencyInjection\Exception\AutowiringFailedException;
 use Symfony\Component\DependencyInjection\Exception\RuntimeException;
 use Symfony\Component\DependencyInjection\LazyProxy\ProxyHelper;
+use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\DependencyInjection\TypedReference;
 
 /**
@@ -256,6 +259,18 @@ private function autowireMethod(\ReflectionFunctionAbstract $reflectionMethod, a
                         $arguments[$index] = new ServiceLocatorArgument(new TaggedIteratorArgument($attribute->tag, $attribute->indexAttribute, $attribute->defaultIndexMethod, true, $attribute->defaultPriorityMethod, (array) $attribute->exclude));
                         break;
                     }
+
+                    if (Autowire::class === $attribute->getName()) {
+                        $value = $attribute->newInstance()->value;
+
+                        if ($value instanceof Reference && $parameter->allowsNull()) {
+                            $value = new Reference($value, ContainerInterface::NULL_ON_INVALID_REFERENCE);
+                        }
+
+                        $arguments[$index] = $value;
+
+                        break;
+                    }
                 }
 
                 if ('' !== ($arguments[$index] ?? '')) {

Tests/Attribute/AutowireTest.php

@@ -0,0 +1,38 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\DependencyInjection\Tests\Attribute;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\DependencyInjection\Attribute\Autowire;
+use Symfony\Component\DependencyInjection\Exception\LogicException;
+
+class AutowireTest extends TestCase
+{
+    public function testCanOnlySetOneParameter()
+    {
+        $this->expectException(LogicException::class);
+
+        new Autowire(service: 'id', expression: 'expr');
+    }
+
+    public function testMustSetOneParameter()
+    {
+        $this->expectException(LogicException::class);
+
+        new Autowire();
+    }
+
+    public function testCanUseZeroForValue()
+    {
+        $this->assertSame('0', (new Autowire(value: '0'))->value);
+    }
+}

Tests/Compiler/AutowirePassTest.php

@@ -20,6 +20,7 @@
 use Symfony\Component\DependencyInjection\Compiler\DecoratorServicePass;
 use Symfony\Component\DependencyInjection\Compiler\ResolveClassPass;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\DependencyInjection\Exception\AutowiringFailedException;
 use Symfony\Component\DependencyInjection\Exception\RuntimeException;
 use Symfony\Component\DependencyInjection\Loader\XmlFileLoader;
@@ -29,6 +30,7 @@
 use Symfony\Component\DependencyInjection\Tests\Fixtures\includes\FooVariadic;
 use Symfony\Component\DependencyInjection\Tests\Fixtures\WithTarget;
 use Symfony\Component\DependencyInjection\TypedReference;
+use Symfony\Component\ExpressionLanguage\Expression;
 use Symfony\Contracts\Service\Attribute\Required;
 
 require_once __DIR__.'/../Fixtures/includes/autowiring_classes.php';
@@ -1121,4 +1123,37 @@ public function testDecorationWithServiceAndAliasedInterface()
         static::assertInstanceOf(DecoratedDecorator::class, $container->get(DecoratorInterface::class));
         static::assertInstanceOf(DecoratedDecorator::class, $container->get(DecoratorImpl::class));
     }
+
+    public function testAutowireAttribute()
+    {
+        $container = new ContainerBuilder();
+
+        $container->register(AutowireAttribute::class)
+            ->setAutowired(true)
+            ->setPublic(true)
+        ;
+
+        $container->register('some.id', \stdClass::class);
+        $container->setParameter('some.parameter', 'foo');
+
+        (new ResolveClassPass())->process($container);
+        (new AutowirePass())->process($container);
+
+        $definition = $container->getDefinition(AutowireAttribute::class);
+
+        $this->assertCount(4, $definition->getArguments());
+        $this->assertEquals(new Reference('some.id'), $definition->getArgument(0));
+        $this->assertEquals(new Expression("parameter('some.parameter')"), $definition->getArgument(1));
+        $this->assertSame('%some.parameter%/bar', $definition->getArgument(2));
+        $this->assertEquals(new Reference('invalid.id', ContainerInterface::NULL_ON_INVALID_REFERENCE), $definition->getArgument(3));
+
+        $container->compile();
+
+        $service = $container->get(AutowireAttribute::class);
+
+        $this->assertInstanceOf(\stdClass::class, $service->service);
+        $this->assertSame('foo', $service->expression);
+        $this->assertSame('foo/bar', $service->value);
+        $this->assertNull($service->invalid);
+    }
 }

Tests/Fixtures/includes/autowiring_classes_80.php

@@ -2,6 +2,7 @@
 
 namespace Symfony\Component\DependencyInjection\Tests\Compiler;
 
+use Symfony\Component\DependencyInjection\Attribute\Autowire;
 use Symfony\Contracts\Service\Attribute\Required;
 
 class AutowireSetter
@@ -26,3 +27,18 @@ class AutowireProperty
     #[Required]
     public Foo $foo;
 }
+
+class AutowireAttribute
+{
+    public function __construct(
+        #[Autowire(service: 'some.id')]
+        public \stdClass $service,
+        #[Autowire(expression: "parameter('some.parameter')")]
+        public string $expression,
+        #[Autowire(value: '%some.parameter%/bar')]
+        public string $value,
+        #[Autowire(service: 'invalid.id')]
+        public ?\stdClass $invalid = null,
+    ) {
+    }
+}