<?php
 
 /*
  * This file is part of the Symfony package.
  *
  * (c) Fabien Potencier <fabien@symfony.com>
  *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
  */
 
 namespace Symfony\Component\Translation\Loader;
 
 use Symfony\Component\Config\Resource\DirectoryResource;
 use Symfony\Component\Translation\Exception\InvalidResourceException;
 use Symfony\Component\Translation\Exception\NotFoundResourceException;
 use Symfony\Component\Translation\MessageCatalogue;
 
 /**
  * IcuResFileLoader loads translations from a resource bundle.
  *
  * @author stealth35
  */
 class IcuResFileLoader implements LoaderInterface
 {
     /**
      * {@inheritdoc}
      */
     public function load($resource, $locale, $domain = 'messages')
     {
         if (!stream_is_local($resource)) {
             throw new InvalidResourceException(sprintf('This is not a local file "%s".', $resource));
         }
 
         if (!is_dir($resource)) {
             throw new NotFoundResourceException(sprintf('File "%s" not found.', $resource));
         }
 
         try {
             $rb = new \ResourceBundle($locale, $resource);
         } catch (\Exception $e) {
             $rb = null;
         }
 
         if (!$rb) {
             throw new InvalidResourceException(sprintf('Cannot load resource "%s"', $resource));
         } elseif (intl_is_failure($rb->getErrorCode())) {
             throw new InvalidResourceException($rb->getErrorMessage(), $rb->getErrorCode());
         }
 
         $messages = $this->flatten($rb);
         $catalogue = new MessageCatalogue($locale);
         $catalogue->add($messages, $domain);
 
         if (class_exists('Symfony\Component\Config\Resource\DirectoryResource')) {
             $catalogue->addResource(new DirectoryResource($resource));
         }
 
         return $catalogue;
     }
 
     /**
      * Flattens an ResourceBundle.
      *
      * The scheme used is:
      *   key { key2 { key3 { "value" } } }
      * Becomes:
      *   'key.key2.key3' => 'value'
      *
      * This function takes an array by reference and will modify it
      *
      * @param \ResourceBundle $rb       The ResourceBundle that will be flattened
      * @param array           $messages Used internally for recursive calls
      * @param string          $path     Current path being parsed, used internally for recursive calls
      *
      * @return array the flattened ResourceBundle
      */
     protected function flatten(\ResourceBundle $rb, array &$messages = [], $path = null)
     {
         foreach ($rb as $key => $value) {
             $nodePath = $path ? $path.'.'.$key : $key;
             if ($value instanceof \ResourceBundle) {
                 $this->flatten($value, $messages, $nodePath);
             } else {
                 $messages[$nodePath] = $value;
             }
         }
 
         return $messages;
     }
 }