Simple implementation of event name normalizer

Author: 7-zete-7

src/StimulusBundle/src/Dto/StimulusAttributes.php

@@ -75,7 +75,7 @@ public function addAction(string $controllerName, string $actionName, ?string $e
         $this->actions[] = [
             'controllerName' => $controllerName,
             'actionName' => $actionName,
-            'eventName' => $eventName,
+            'eventName' => $this->normalizeEventName($eventName),
         ];
 
         foreach ($parameters as $name => $value) {
@@ -236,6 +236,20 @@ private function normalizeControllerName(string $controllerName): string
         return preg_replace('/^@/', '', str_replace('_', '-', str_replace('/', '--', $controllerName)));
     }
 
+    /**
+     * Normalize a Stimulus controller's action event name.
+     *
+     * @see https://stimulus.hotwired.dev/reference/actions
+     */
+    private function normalizeEventName(?string $eventName): ?string
+    {
+        if (null === $eventName) {
+            return null;
+        }
+
+        return preg_replace_callback('/^.+(?=:)/', fn (array $matches): string => $this->normalizeControllerName($matches[0]), $eventName);
+    }
+
     /**
      * Normalize a Stimulus Value API key into its HTML equivalent ("kebab case").
      * Backport features from symfony/string.