feature #24937 [DependencyInjection] Added support for variadics in named arguments (PabloKowalczyk)

This PR was squashed before being merged into the 4.1-dev branch (closes #24937).

Discussion
----------

[DependencyInjection] Added support for variadics in named arguments

| Q             | A
| ------------- | ---
| Branch?       | 4.1
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #24935
| License       | MIT

Commits
-------

b5c0e8977c [DependencyInjection] Added support for variadics in named arguments

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

@@ -55,7 +55,13 @@ class ResolveNamedArgumentsPass extends AbstractRecursivePass
                 if (isset($key[0]) && '$' === $key[0]) {
                     foreach ($parameters as $j => $p) {
                         if ($key === '$'.$p->name) {
+                            if ($p->isVariadic() && \is_array($argument)) {
+                                foreach ($argument as $variadicArgument) {
+                                    $resolvedArguments[$j++] = $variadicArgument;
+                                }
+                            } else {
                                 $resolvedArguments[$j] = $argument;
+                            }
 
                             continue 2;
                         }

src/Symfony/Component/DependencyInjection/Tests/Compiler/ResolveNamedArgumentsPassTest.php

@@ -17,6 +17,7 @@ use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\DependencyInjection\Tests\Fixtures\CaseSensitiveClass;
 use Symfony\Component\DependencyInjection\Tests\Fixtures\NamedArgumentsDummy;
+use Symfony\Component\DependencyInjection\Tests\Fixtures\NamedArgumentsVariadicsDummy;
 use Symfony\Component\DependencyInjection\Tests\Fixtures\SimilarArgumentsDummy;
 
 /**
@@ -152,6 +153,36 @@ class ResolveNamedArgumentsPassTest extends TestCase
 
         $this->assertEquals(array(new Reference('bar'), 'qwerty', new Reference('foo')), $definition->getArguments());
     }
+
+    public function testVariadics()
+    {
+        $container = new ContainerBuilder();
+
+        $definition = $container->register(NamedArgumentsVariadicsDummy::class, NamedArgumentsVariadicsDummy::class);
+        $definition->setArguments(
+            array(
+                '$class' => new \stdClass(),
+                '$variadics' => array(
+                    new Reference('foo'),
+                    new Reference('bar'),
+                    new Reference('baz'),
+                ),
+            )
+        );
+
+        $pass = new ResolveNamedArgumentsPass();
+        $pass->process($container);
+
+        $this->assertEquals(
+            array(
+                0 => new \stdClass(),
+                1 => new Reference('foo'),
+                2 => new Reference('bar'),
+                3 => new Reference('baz'),
+            ),
+            $definition->getArguments()
+        );
+    }
 }
 
 class NoConstructor

src/Symfony/Component/DependencyInjection/Tests/Fixtures/NamedArgumentsVariadicsDummy.php

@@ -0,0 +1,10 @@
+<?php
+
+namespace Symfony\Component\DependencyInjection\Tests\Fixtures;
+
+class NamedArgumentsVariadicsDummy
+{
+    public function __construct(\stdClass $class, ...$variadics)
+    {
+    }
+}