bug #20465 [#18637][TranslationDebug] workaround for getFallbackLocales. (aitboudad)

This PR was merged into the 2.7 branch.

Discussion
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[#18637][TranslationDebug] workaround for getFallbackLocales.

| Q             | A
| ------------- | ---
| Branch?       | 2.7
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #18637
| License       | MIT
| Doc PR        | ~

Commits
-------

31deea1 [TranslationDebug] workaround for getFallbackLocales.

src/Symfony/Bundle/FrameworkBundle/Command/TranslationDebugCommand.php

@@ -19,6 +19,8 @@ use Symfony\Component\Console\Input\InputArgument;
 use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Translation\MessageCatalogue;
 use Symfony\Component\Translation\Translator;
+use Symfony\Component\Translation\DataCollectorTranslator;
+use Symfony\Component\Translation\LoggingTranslator;
 
 /**
  * Helps finding unused or missing translation messages in a given locale
@@ -157,7 +159,7 @@ EOF
         // Load the fallback catalogues
         $fallbackCatalogues = array();
         $translator = $this->getContainer()->get('translator');
-        if ($translator instanceof Translator) {
+        if ($translator instanceof Translator || $translator instanceof DataCollectorTranslator || $translator instanceof LoggingTranslator) {
             foreach ($translator->getFallbackLocales() as $fallbackLocale) {
                 if ($fallbackLocale === $locale) {
                     continue;

src/Symfony/Component/Translation/DataCollectorTranslator.php

@@ -88,6 +88,20 @@ class DataCollectorTranslator implements TranslatorInterface, TranslatorBagInter
         return $this->translator->getCatalogue($locale);
     }
 
+    /**
+     * Gets the fallback locales.
+     *
+     * @return array $locales The fallback locales
+     */
+    public function getFallbackLocales()
+    {
+        if ($this->translator instanceof Translator) {
+            return $this->translator->getFallbackLocales();
+        }
+
+        return array();
+    }
+
     /**
      * Passes through all unknown calls onto the translator object.
      */

src/Symfony/Component/Translation/LoggingTranslator.php

@@ -88,6 +88,20 @@ class LoggingTranslator implements TranslatorInterface, TranslatorBagInterface
         return $this->translator->getCatalogue($locale);
     }
 
+    /**
+     * Gets the fallback locales.
+     *
+     * @return array $locales The fallback locales
+     */
+    public function getFallbackLocales()
+    {
+        if ($this->translator instanceof Translator) {
+            return $this->translator->getFallbackLocales();
+        }
+
+        return array();
+    }
+
     /**
      * Passes through all unknown calls onto the translator object.
      */