Compiler::addExtension() allows empty name

Author: dg

src/DI/Compiler.php

@@ -46,11 +46,14 @@ public function __construct(ContainerBuilder $builder = NULL)
 
 	/**
 	 * Add custom configurator extension.
+	 * @param  string|NULL
 	 * @return static
 	 */
 	public function addExtension($name, CompilerExtension $extension)
 	{
-		if (isset($this->extensions[$name]) || isset(self::$reserved[$name])) {
+		if ($name === NULL) {
+			$name = '_' . count($this->extensions);
+		} elseif (isset($this->extensions[$name]) || isset(self::$reserved[$name])) {
 			throw new Nette\InvalidArgumentException("Name '$name' is already used or reserved.");
 		}
 		$this->extensions[$name] = $extension->setCompiler($this, $name);

src/DI/Extensions/ExtensionsExtension.php

@@ -19,6 +19,9 @@ class ExtensionsExtension extends Nette\DI\CompilerExtension
 	public function loadConfiguration()
 	{
 		foreach ($this->getConfig() as $name => $class) {
+			if (is_int($name)) {
+				$name = NULL;
+			}
 			if ($class instanceof Nette\DI\Statement) {
 				$rc = new \ReflectionClass($class->getEntity());
 				$this->compiler->addExtension($name, $rc->newInstanceArgs($class->arguments));

tests/DI/Compiler.extension.anonymous.phpt

@@ -0,0 +1,21 @@
+<?php
+
+declare(strict_types=1);
+
+use Nette\DI;
+use Tester\Assert;
+
+
+require __DIR__ . '/../bootstrap.php';
+
+
+class FooExtension extends Nette\DI\CompilerExtension
+{
+}
+
+
+$compiler = new DI\Compiler;
+$compiler->addExtension(NULL, new FooExtension);
+$compiler->addExtension(NULL, new FooExtension);
+
+Assert::count(2, $compiler->getExtensions());