Add service providers

src/Container.php

@@ -13,6 +13,13 @@ public function __construct(array $config = [], $selfName = '') {
         }
     }
 
+    public function connect(ProviderInterface $provider) {
+        $this->initializers[$provider->getName()] = function () use ($provider) {
+            $this->inject($provider);
+            return $provider->provide();
+        };
+    }
+
     public function register($name, $initializer) {
         if ($initializer instanceof Value) {
             $this->services[$name] = $initializer->getValue();

src/DeclarerInterface.php

@@ -1,5 +1,4 @@
 <?php
-
 namespace SD\DependencyInjection;
 
 interface DeclarerInterface {

src/ProviderInterface.php

@@ -0,0 +1,7 @@
+<?php
+namespace SD\DependencyInjection;
+
+interface ProviderInterface {
+    public function getName(): string;
+    public function provide();
+}

tests/ContainerTest.php

@@ -49,4 +49,20 @@ public function testExtend() {
         $service = $container->get($serviceName);
         $this->assertEquals($name2, $service->getName(), 'Must return modified name');
     }
+
+    public function testConnect() {
+        $name = 'Luke Skywalker';
+        $container = new Container(
+            [
+                'name' => $name,
+            ],
+            'container'
+        );
+        $provider = new LegacyProvider();
+        $container->connect($provider);
+        $service = $container->get($provider->getName());
+        $this->assertInstanceOf(LegacyService::class, $service, 'Must return instance of LegacyService');
+        $this->assertEquals($name, $service->getName(), 'Must inject name from config');
+        $this->assertEquals($container, $service->getContainer(), 'Must inject container by setter');
+    }
 }

tests/LegacyProvider.php

@@ -0,0 +1,32 @@
+<?php
+namespace tests;
+
+use SD\DependencyInjection\AutoDeclareTrait;
+use SD\DependencyInjection\ContainerAwareTrait;
+use SD\DependencyInjection\DeclarerInterface;
+use SD\DependencyInjection\ProviderInterface;
+
+class LegacyProvider implements DeclarerInterface, ProviderInterface {
+    use AutoDeclareTrait {
+        declareDependencies as autoDeclareDependencies;
+    }
+    use ContainerAwareTrait;
+
+    private $name;
+
+    public function declareDependencies() {
+        return array_merge($this->autoDeclareDependencies(), ['name']);
+    }
+
+    public function setName(string $name) {
+        $this->name = $name;
+    }
+
+    public function getName(): string {
+        return 'helloWorld';
+    }
+
+    public function provide() {
+        return new LegacyService($this->name, $this->container);
+    }
+}

tests/LegacyService.php

@@ -0,0 +1,22 @@
+<?php
+namespace tests;
+
+use SD\DependencyInjection\Container;
+
+class LegacyService {
+    private $container;
+    private $name;
+
+    public function __construct(string $name, Container $container) {
+        $this->name = $name;
+        $this->container = $container;
+    }
+
+    public function getName(): string {
+        return $this->name;
+    }
+
+    public function getContainer() {
+        return $this->container;
+    }
+}