Bind

Author: cosmastech

src/Illuminate/Container/Attributes/Bind.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace Illuminate\Container\Attributes;
+
+use Attribute;
+
+#[Attribute(Attribute::TARGET_CLASS)]
+class Bind
+{
+    /**
+     * @param  class-string  $concrete
+     */
+    public function __construct(
+        public string $concrete,
+    ) {
+    }
+}

src/Illuminate/Container/Container.php

@@ -5,6 +5,7 @@
 use ArrayAccess;
 use Closure;
 use Exception;
+use Illuminate\Container\Attributes\Bind;
 use Illuminate\Container\Attributes\Scoped;
 use Illuminate\Container\Attributes\Singleton;
 use Illuminate\Contracts\Container\BindingResolutionException;
@@ -961,7 +962,19 @@ protected function getConcrete($abstract)
             return $this->bindings[$abstract]['concrete'];
         }
 
-        return $abstract;
+        $attributes = [];
+        try {
+            $attributes = (new ReflectionClass($abstract))->getAttributes(Bind::class);
+        } catch (ReflectionException) {
+        }
+
+        if ($attributes === []) {
+            return $abstract;
+        }
+
+        $this->bind($abstract, $attributes[0]->newInstance()->concrete);
+
+        return $this->bindings[$abstract]['concrete'];
     }
 
     /**

tests/Container/ContainerTest.php

@@ -3,6 +3,7 @@
 namespace Illuminate\Tests\Container;
 
 use Attribute;
+use Illuminate\Container\Attributes\Bind;
 use Illuminate\Container\Attributes\Scoped;
 use Illuminate\Container\Attributes\Singleton;
 use Illuminate\Container\Container;
@@ -766,6 +767,29 @@ public function testContainerScopedAttribute()
         $this->assertNotSame($firstInstantiation, $thirdInstantiation);
     }
 
+    public function testBindInterfaceToSingleton()
+    {
+        $container = new Container;
+        $firstInstantiation = $container->get(ContainerBindSingletonTestInterface::class);
+        $secondInstantiation = $container->get(ContainerBindSingletonTestInterface::class);
+
+        $this->assertSame($firstInstantiation, $secondInstantiation);
+    }
+
+    public function testBindInterfaceToScoped()
+    {
+        $container = new Container;
+        $firstInstantiation = $container->get(ContainerBindScopedTestInterface::class);
+        $secondInstantiation = $container->get(ContainerBindScopedTestInterface::class);
+
+        $this->assertSame($firstInstantiation, $secondInstantiation);
+
+        $container->forgetScopedInstances();
+
+        $thirdInstantiation = $container->get(ContainerBindScopedTestInterface::class);
+        $this->assertNotSame($firstInstantiation, $thirdInstantiation);
+    }
+
     // public function testContainerCanCatchCircularDependency()
     // {
     //     $this->expectException(\Illuminate\Contracts\Container\CircularDependencyException::class);
@@ -935,3 +959,13 @@ class ContainerSingletonAttribute
 class ContainerScopedAttribute
 {
 }
+
+#[Bind(ContainerSingletonAttribute::class)]
+interface ContainerBindSingletonTestInterface
+{
+}
+
+#[Bind(ContainerScopedAttribute::class)]
+interface ContainerBindScopedTestInterface
+{
+}