[DI] Allow definitions to inherit tags from parent context

src/Symfony/Component/DependencyInjection/CHANGELOG.md

@@ -4,11 +4,13 @@ CHANGELOG
 3.3.0
 -----
 
- * Add "iterator" argument type for lazy iteration over a set of values and services
-
- * Using the `PhpDumper` with an uncompiled `ContainerBuilder` is deprecated and
-   will not be supported anymore in 4.0.
-
+ * added "iterator" argument type for lazy iteration over a set of values and services
+ * added "closure-proxy" argument type for turning services' methods into lazy callables
+ * added file-wide configurable defaults for service attributes "public", "tags",
+   "autowire" and a new "inherit-tags"
+ * made the "class" attribute optional, using the "id" as fallback
+ * using the `PhpDumper` with an uncompiled `ContainerBuilder` is deprecated and
+   will not be supported anymore in 4.0
  * deprecated the `DefinitionDecorator` class in favor of `ChildDefinition`
 
 3.2.0

src/Symfony/Component/DependencyInjection/ChildDefinition.php

@@ -22,6 +22,7 @@ use Symfony\Component\DependencyInjection\Exception\OutOfBoundsException;
 class ChildDefinition extends Definition
 {
     private $parent;
+    private $inheritTags = false;
     private $changes = array();
 
     /**
@@ -54,6 +55,30 @@ class ChildDefinition extends Definition
         return $this->changes;
     }
 
+    /**
+     * Sets whether tags should be inherited from the parent or not.
+     *
+     * @param bool $boolean
+     *
+     * @return $this
+     */
+    public function setInheritTags($boolean)
+    {
+        $this->inheritTags = (bool) $boolean;
+
+        return $this;
+    }
+
+    /**
+     * Returns whether tags should be inherited from the parent or not.
+     *
+     * @return bool
+     */
+    public function getInheritTags()
+    {
+        return $this->inheritTags;
+    }
+
     /**
      * {@inheritdoc}
      */

src/Symfony/Component/DependencyInjection/Compiler/ResolveDefinitionTemplatesPass.php

@@ -216,6 +216,15 @@ class ResolveDefinitionTemplatesPass implements CompilerPassInterface
         $def->setShared($definition->isShared());
         $def->setTags($definition->getTags());
 
+        // append parent tags when inheriting is enabled
+        if ($definition->getInheritTags()) {
+            foreach ($parentDef->getTags() as $k => $v) {
+                foreach ($v as $v) {
+                    $def->addTag($k, $v);
+                }
+            }
+        }
+
         return $def;
     }
 }

src/Symfony/Component/DependencyInjection/Loader/XmlFileLoader.php

@@ -150,6 +150,9 @@ class XmlFileLoader extends FileLoader
         if ($defaultsNode->hasAttribute('public')) {
             $defaults['public'] = XmlUtils::phpize($defaultsNode->getAttribute('public'));
         }
+        if ($defaultsNode->hasAttribute('inherit-tags')) {
+            $defaults['inherit-tags'] = XmlUtils::phpize($defaultsNode->getAttribute('inherit-tags'));
+        }
         if (!$defaultsNode->hasAttribute('autowire')) {
             foreach ($defaults['autowire'] as $k => $v) {
                 $defaults['autowire'][$k] = $v->textContent;
@@ -194,6 +197,12 @@ class XmlFileLoader extends FileLoader
 
         if ($parent = $service->getAttribute('parent')) {
             $definition = new ChildDefinition($parent);
+
+            if ($value = $service->getAttribute('inherit-tags')) {
+                $definition->setInheritTags(XmlUtils::phpize($value));
+            } elseif (isset($defaults['inherit-tags'])) {
+                $definition->setInheritTags($defaults['inherit-tags']);
+            }
             $defaults = array();
         } else {
             $definition = new Definition();
@@ -270,8 +279,15 @@ class XmlFileLoader extends FileLoader
         }
 
         $tags = $this->getChildren($service, 'tag');
-        if (!$tags && !empty($defaults['tags'])) {
-            $tags = $defaults['tags'];
+
+        if (empty($defaults['tags'])) {
+            // no-op
+        } elseif (!$value = $service->getAttribute('inherit-tags')) {
+            if (!$tags) {
+                $tags = $defaults['tags'];
+            }
+        } elseif (XmlUtils::phpize($value)) {
+            $tags = array_merge($tags, $defaults['tags']);
         }
 
         foreach ($tags as $tag) {

src/Symfony/Component/DependencyInjection/Loader/YamlFileLoader.php

@@ -52,6 +52,7 @@ class YamlFileLoader extends FileLoader
         'configurator' => 'configurator',
         'calls' => 'calls',
         'tags' => 'tags',
+        'inherit_tags' => 'inherit_tags',
         'decorates' => 'decorates',
         'decoration_inner_name' => 'decoration_inner_name',
         'decoration_priority' => 'decoration_priority',
@@ -156,7 +157,7 @@ class YamlFileLoader extends FileLoader
                 @trigger_error('Giving a service the "_defaults" name is deprecated since Symfony 3.3 and will be forbidden in 4.0. Rename your service.', E_USER_DEPRECATED);
                 $defaults = array();
             } else {
-                $defaultKeys = array('public', 'tags', 'autowire');
+                $defaultKeys = array('public', 'tags', 'inherit_tags', 'autowire');
                 unset($content['services']['_defaults']);
 
                 foreach ($defaults as $key => $default) {
@@ -240,6 +241,11 @@ class YamlFileLoader extends FileLoader
 
         if (isset($service['parent'])) {
             $definition = new ChildDefinition($service['parent']);
+
+            $inheritTag = isset($service['inherit_tags']) ? $service['inherit_tags'] : (isset($defaults['inherit_tags']) ? $defaults['inherit_tags'] : null);
+            if (null !== $inheritTag) {
+                $definition->setInheritTags($inheritTag);
+            }
             $defaults = array();
         } else {
             $definition = new Definition();
@@ -312,7 +318,18 @@ class YamlFileLoader extends FileLoader
             }
         }
 
-        $tags = isset($service['tags']) ? $service['tags'] : (isset($defaults['tags']) ? $defaults['tags'] : null);
+        $tags = isset($service['tags']) ? $service['tags'] : array();
+
+        if (!isset($defaults['tags'])) {
+            // no-op
+        } elseif (!isset($service['inherit_tags'])) {
+            if (!isset($service['tags'])) {
+                $tags = $defaults['tags'];
+            }
+        } elseif ($service['inherit_tags']) {
+            $tags = array_merge($tags, $defaults['tags']);
+        }
+
         if (null !== $tags) {
             if (!is_array($tags)) {
                 throw new InvalidArgumentException(sprintf('Parameter "tags" must be an array for service "%s" in %s. Check your YAML syntax.', $id, $file));

src/Symfony/Component/DependencyInjection/Loader/schema/dic/services/services-1.0.xsd

@@ -102,6 +102,7 @@
     </xsd:choice>
     <xsd:attribute name="public" type="boolean" />
     <xsd:attribute name="autowire" type="boolean" />
+    <xsd:attribute name="inherit-tags" type="boolean" />
   </xsd:complexType>
 
   <xsd:complexType name="service">
@@ -130,6 +131,7 @@
     <xsd:attribute name="decoration-inner-name" type="xsd:string" />
     <xsd:attribute name="decoration-priority" type="xsd:integer" />
     <xsd:attribute name="autowire" type="boolean" />
+    <xsd:attribute name="inherit-tags" type="boolean" />
   </xsd:complexType>
 
   <xsd:complexType name="tag">

src/Symfony/Component/DependencyInjection/Tests/Fixtures/xml/services29.xml

@@ -6,12 +6,13 @@
         </defaults>
 
         <service id="with_defaults" class="Foo" />
-        <service id="no_defaults" class="Foo" public="true" autowire="false">
-            <tag name="bar" />
+        <service id="no_defaults" class="Foo" public="true" autowire="false" inherit-tags="false">
         </service>
         <service id="no_defaults_child" class="Foo" parent="no_defaults">
             <tag name="bar" />
         </service>
-        <service id="with_defaults_child" class="Foo" parent="with_defaults" />
+        <service id="with_defaults_child" class="Foo" parent="with_defaults" public="true" inherit-tags="true">
+            <tag name="baz" />
+        </service>
     </services>
 </container>

src/Symfony/Component/DependencyInjection/Tests/Fixtures/yaml/services28.yml

@@ -10,9 +10,9 @@ services:
 
     with_null:
         class: Foo
-        public: ~
+        public: true
         autowire: ~
-        tags: ~
+        inherit_tags: false
 
     no_defaults:
         class: Foo
@@ -28,3 +28,7 @@ services:
 
     with_defaults_child:
         parent: with_defaults
+        public: true
+        inherit_tags: true
+        tags:
+            - name: baz

src/Symfony/Component/DependencyInjection/Tests/Loader/XmlFileLoaderTest.php

@@ -625,19 +625,23 @@ class XmlFileLoaderTest extends \PHPUnit_Framework_TestCase
         $loader->load('services29.xml');
 
         $this->assertFalse($container->getDefinition('with_defaults')->isPublic());
+        $this->assertSame(array('foo' => array(array())), $container->getDefinition('with_defaults')->getTags());
+        $this->assertTrue($container->getDefinition('with_defaults')->isAutowired());
+
+        $this->assertArrayNotHasKey('public', $container->getDefinition('no_defaults_child')->getChanges());
+        $this->assertArrayNotHasKey('autowire', $container->getDefinition('no_defaults_child')->getChanges());
+
+        $container->compile();
+
         $this->assertTrue($container->getDefinition('no_defaults')->isPublic());
         $this->assertTrue($container->getDefinition('no_defaults_child')->isPublic());
-        $this->assertArrayNotHasKey('public', $container->getDefinition('no_defaults_child')->getChanges());
 
-        $this->assertSame(array('foo' => array(array())), $container->getDefinition('with_defaults')->getTags());
-        $this->assertSame(array('bar' => array(array())), $container->getDefinition('no_defaults')->getTags());
+        $this->assertSame(array(), $container->getDefinition('no_defaults')->getTags());
         $this->assertSame(array('bar' => array(array())), $container->getDefinition('no_defaults_child')->getTags());
-        $this->assertSame(array(), $container->getDefinition('with_defaults_child')->getTags());
+        $this->assertSame(array('baz' => array(array()), 'foo' => array(array())), $container->getDefinition('with_defaults_child')->getTags());
 
-        $this->assertTrue($container->getDefinition('with_defaults')->isAutowired());
         $this->assertFalse($container->getDefinition('no_defaults')->isAutowired());
         $this->assertFalse($container->getDefinition('no_defaults_child')->isAutowired());
-        $this->assertArrayNotHasKey('autowire', $container->getDefinition('no_defaults_child')->getChanges());
     }
 
     public function testDefaultsWithAutowiredMethods()

src/Symfony/Component/DependencyInjection/Tests/Loader/YamlFileLoaderTest.php

@@ -359,22 +359,26 @@ class YamlFileLoaderTest extends \PHPUnit_Framework_TestCase
         $loader->load('services28.yml');
 
         $this->assertFalse($container->getDefinition('with_defaults')->isPublic());
-        $this->assertFalse($container->getDefinition('with_null')->isPublic());
+        $this->assertSame(array('foo' => array(array())), $container->getDefinition('with_defaults')->getTags());
+        $this->assertTrue($container->getDefinition('with_defaults')->isAutowired());
+
+        $this->assertArrayNotHasKey('public', $container->getDefinition('no_defaults_child')->getChanges());
+        $this->assertArrayNotHasKey('autowire', $container->getDefinition('no_defaults_child')->getChanges());
+
+        $container->compile();
+
+        $this->assertTrue($container->getDefinition('with_null')->isPublic());
         $this->assertTrue($container->getDefinition('no_defaults')->isPublic());
         $this->assertTrue($container->getDefinition('no_defaults_child')->isPublic());
-        $this->assertArrayNotHasKey('public', $container->getDefinition('no_defaults_child')->getChanges());
 
-        $this->assertSame(array('foo' => array(array())), $container->getDefinition('with_defaults')->getTags());
-        $this->assertSame(array('foo' => array(array())), $container->getDefinition('with_null')->getTags());
+        $this->assertSame(array(), $container->getDefinition('with_null')->getTags());
         $this->assertSame(array(), $container->getDefinition('no_defaults')->getTags());
         $this->assertSame(array('bar' => array(array())), $container->getDefinition('no_defaults_child')->getTags());
-        $this->assertSame(array(), $container->getDefinition('with_defaults_child')->getTags());
+        $this->assertSame(array('baz' => array(array()), 'foo' => array(array())), $container->getDefinition('with_defaults_child')->getTags());
 
-        $this->assertTrue($container->getDefinition('with_defaults')->isAutowired());
         $this->assertTrue($container->getDefinition('with_null')->isAutowired());
         $this->assertFalse($container->getDefinition('no_defaults')->isAutowired());
         $this->assertFalse($container->getDefinition('no_defaults_child')->isAutowired());
-        $this->assertArrayNotHasKey('autowire', $container->getDefinition('no_defaults_child')->getChanges());
     }
 
     /**