bug symfony#54760 [Validator] handle union and intersection types for cascaded validations (xabbuh)

This PR was merged into the 5.4 branch.

Discussion
----------

[Validator] handle union and intersection types for cascaded validations

| Q             | A
| ------------- | ---
| Branch?       | 5.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Issues        | Fix symfony#49629, Fix symfony#53735
| License       | MIT

Commits
-------

18e06a8 handle union and intersection types for cascaded validations

Author: nicolas-grekas

src/Symfony/Component/Validator/Mapping/ClassMetadata.php

@@ -210,7 +210,7 @@ public function addConstraint(Constraint $constraint)
             $this->cascadingStrategy = CascadingStrategy::CASCADE;
 
             foreach ($this->getReflectionClass()->getProperties() as $property) {
-                if ($property->hasType() && (('array' === $type = $property->getType()->getName()) || class_exists($type))) {
+                if ($this->canCascade($property->getType())) {
                     $this->addPropertyConstraint($property->getName(), new Valid());
                 }
             }
@@ -511,4 +511,33 @@ private function checkConstraint(Constraint $constraint)
             }
         }
     }
+
+    private function canCascade(?\ReflectionType $type = null): bool
+    {
+        if (null === $type) {
+            return false;
+        }
+
+        if ($type instanceof \ReflectionIntersectionType) {
+            foreach ($type->getTypes() as $nestedType) {
+                if ($this->canCascade($nestedType)) {
+                    return true;
+                }
+            }
+
+            return false;
+        }
+
+        if ($type instanceof \ReflectionUnionType) {
+            foreach ($type->getTypes() as $nestedType) {
+                if (!$this->canCascade($nestedType)) {
+                    return false;
+                }
+            }
+
+            return true;
+        }
+
+        return $type instanceof \ReflectionNamedType && (\in_array($type->getName(), ['array', 'null'], true) || class_exists($type->getName()));
+    }
 }

src/Symfony/Component/Validator/Tests/Fixtures/CascadingEntityIntersection.php

@@ -0,0 +1,17 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Validator\Tests\Fixtures;
+
+class CascadingEntityIntersection
+{
+    public CascadedChild&\stdClass $classes;
+}

src/Symfony/Component/Validator/Tests/Fixtures/CascadingEntityUnion.php

@@ -0,0 +1,25 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Validator\Tests\Fixtures;
+
+class CascadingEntityUnion
+{
+    public CascadedChild|\stdClass $classes;
+    public CascadedChild|array $classAndArray;
+    public CascadedChild|null $classAndNull;
+    public array|null $arrayAndNull;
+    public CascadedChild|array|null $classAndArrayAndNull;
+    public int|string $scalars;
+    public int|null $scalarAndNull;
+    public CascadedChild|int $classAndScalar;
+    public array|int $arrayAndScalar;
+}

src/Symfony/Component/Validator/Tests/Mapping/ClassMetadataTest.php

@@ -25,6 +25,8 @@
 use Symfony\Component\Validator\Tests\Fixtures\Annotation\EntityParent;
 use Symfony\Component\Validator\Tests\Fixtures\Annotation\GroupSequenceProviderEntity;
 use Symfony\Component\Validator\Tests\Fixtures\CascadingEntity;
+use Symfony\Component\Validator\Tests\Fixtures\CascadingEntityIntersection;
+use Symfony\Component\Validator\Tests\Fixtures\CascadingEntityUnion;
 use Symfony\Component\Validator\Tests\Fixtures\ClassConstraint;
 use Symfony\Component\Validator\Tests\Fixtures\ConstraintA;
 use Symfony\Component\Validator\Tests\Fixtures\ConstraintB;
@@ -361,6 +363,40 @@ public function testCascadeConstraint()
             'children',
         ], $metadata->getConstrainedProperties());
     }
+
+    /**
+     * @requires PHP 8.0
+     */
+    public function testCascadeConstraintWithUnionTypeProperties()
+    {
+        $metadata = new ClassMetadata(CascadingEntityUnion::class);
+        $metadata->addConstraint(new Cascade());
+
+        $this->assertSame(CascadingStrategy::CASCADE, $metadata->getCascadingStrategy());
+        $this->assertCount(5, $metadata->properties);
+        $this->assertSame([
+            'classes',
+            'classAndArray',
+            'classAndNull',
+            'arrayAndNull',
+            'classAndArrayAndNull',
+        ], $metadata->getConstrainedProperties());
+    }
+
+    /**
+     * @requires PHP 8.1
+     */
+    public function testCascadeConstraintWithIntersectionTypeProperties()
+    {
+        $metadata = new ClassMetadata(CascadingEntityIntersection::class);
+        $metadata->addConstraint(new Cascade());
+
+        $this->assertSame(CascadingStrategy::CASCADE, $metadata->getCascadingStrategy());
+        $this->assertCount(1, $metadata->properties);
+        $this->assertSame([
+            'classes',
+        ], $metadata->getConstrainedProperties());
+    }
 }
 
 class ClassCompositeConstraint extends Composite