ContainerBuilder:resolveImplement supports polymorphism (#175)

src/DI/ContainerBuilder.php

@@ -417,7 +417,12 @@ private function resolveImplement(ServiceDefinition $def, $name): void
 				$hint = Reflection::getParameterType($param);
 				if (isset($ctorParams[$param->getName()])) {
 					$arg = $ctorParams[$param->getName()];
-					if ($hint !== Reflection::getParameterType($arg)) {
+					if ($hint && class_exists($hint)) {
+						$hints = [$hint => $hint] + class_parents($hint) + class_implements($hint);
+						if (!isset($hints[Reflection::getParameterType($arg)])) {
+							throw new ServiceCreationException("Type hint for \${$param->getName()} in $methodName doesn't match type hint in $class constructor.");
+						}
+					} elseif ($hint !== Reflection::getParameterType($arg)) {
 						throw new ServiceCreationException("Type hint for \${$param->getName()} in $methodName doesn't match type hint in $class constructor.");
 					}
 					$def->getFactory()->arguments[$arg->getPosition()] = self::literal('$' . $arg->getName());

tests/DI/Compiler.generatedFactory.polymorphism.phpt

@@ -0,0 +1,101 @@
+<?php
+
+/**
+ * Test: Nette\DI\Compiler: generated services factories from interfaces with class type hints in parameters.
+ */
+
+declare(strict_types=1);
+
+use Nette\DI;
+use Tester\Assert;
+
+
+require __DIR__ . '/../bootstrap.php';
+
+interface IShape
+{
+	public function getName(): string;
+}
+
+class Circle implements IShape
+{
+	public function getName(): string
+	{
+		return 'circle';
+	}
+}
+
+class Triangle implements IShape
+{
+	public function getName(): string
+	{
+		return 'triangle';
+	}
+}
+
+class Ellipse extends Circle
+{
+	public function getName(): string
+	{
+		return 'ellipse';
+	}
+}
+
+interface ICircleFactory
+{
+	public function create(Circle $shape): Picture;
+}
+
+interface ITriangleFactory
+{
+	public function create(Triangle $shape): Picture;
+}
+
+interface IEllipseFactory
+{
+	public function create(Ellipse $shape): Picture;
+}
+
+class Picture
+{
+	public $shape;
+
+
+	public function __construct(IShape $shape)
+	{
+		$this->shape = $shape;
+	}
+
+
+	public function getName(): string
+	{
+		return $this->shape->getName();
+	}
+}
+
+$compiler = new DI\Compiler;
+$container = createContainer($compiler, 'files/compiler.generatedFactory.polymorphism.neon');
+
+Assert::type(ICircleFactory::class, $container->getService('circle'));
+$picture = $container->getService('circle')->create(new Circle());
+Assert::type(Picture::class, $picture);
+Assert::same('circle', $picture->getName());
+
+Assert::type(ITriangleFactory::class, $container->getService('triangle'));
+$picture = $container->getService('triangle')->create(new Triangle());
+Assert::type(Picture::class, $picture);
+Assert::same('triangle', $picture->getName());
+
+Assert::type(IEllipseFactory::class, $container->getService('ellipse'));
+$picture = $container->getService('ellipse')->create(new Ellipse());
+Assert::type(Picture::class, $picture);
+Assert::same('ellipse', $picture->getName());
+
+Assert::type(ICircleFactory::class, $container->getService('circle'));
+$picture = $container->getService('circle')->create(new Ellipse());
+Assert::type(Picture::class, $picture);
+Assert::same('ellipse', $picture->getName());
+
+Assert::throws(function () use ($container) {
+	$container->getService('ellipse')->create(new Circle());
+}, TypeError::class);

tests/DI/files/compiler.generatedFactory.polymorphism.neon

@@ -0,0 +1,10 @@
+services:
+
+	circle:
+		implement: ICircleFactory
+
+	triangle:
+		implement: ITriangleFactory
+
+	ellipse:
+		implement: IEllipseFactory