computeFallbackLocales example

/** * @return void */
    protected function initializeCatalogue(string $locale)
    {
        $this->assertValidLocale($locale);

        try {
            $this->doLoadCatalogue($locale);
        } catch (NotFoundResourceException $e) {
            if (!$this->computeFallbackLocales($locale)) {
                throw $e;
            }
        }
        $this->loadFallbackCatalogues($locale);
    }

    private function initializeCacheCatalogue(string $locale): void
    {
        if (isset($this->catalogues[$locale])) {
            /* Catalogue already initialized. */
            return;
        }