bug #30487 Fix Cache error while using anonymous class (Emmanuel BORGES)

This PR was merged into the 3.4 branch.

Discussion
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Fix Cache error while using anonymous class

| Q             | A
| ------------- | ---
| Branch?       | 4.2
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #30395
| License       | MIT

Fix Cache error while using anonymous class

Commits
-------

036e722 Fix Cache error while using anonymous class

src/Symfony/Component/Validator/Mapping/Cache/Psr6Cache.php

@@ -70,6 +70,11 @@ public function write(ClassMetadata $metadata)
      */
     private function escapeClassName($class)
     {
+        if (false !== strpos($class, '@')) {
+            // anonymous class: replace all PSR6-reserved characters
+            return str_replace(["\0", '\\', '/', '@', ':', '{', '}', '(', ')'], '.', $class);
+        }
+
         return str_replace('\\', '.', $class);
     }
 }

src/Symfony/Component/Validator/Tests/Mapping/Cache/Psr6CacheTest.php

@@ -23,4 +23,12 @@ public function testNameCollision()
         $this->cache->write($metadata);
         $this->assertFalse($this->cache->has('Foo_Bar'));
     }
+
+    public function testNameWithInvalidChars()
+    {
+        $metadata = new ClassMetadata('class@anonymous/path/file');
+
+        $this->cache->write($metadata);
+        $this->assertTrue($this->cache->has('class@anonymous/path/file'));
+    }
 }