<?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\Dumper;
 
 use Symfony\Component\Translation\MessageCatalogue;
 
 /**
  * PoFileDumper generates a gettext formatted string representation of a message catalogue.
  *
  * @author Stealth35
  */
 class PoFileDumper extends FileDumper
 {
     /**
      * {@inheritdoc}
      */
     public function formatCatalogue(MessageCatalogue $messages, $domain, array $options = [])
     {
         $output = 'msgid ""'."\n";
         $output .= 'msgstr ""'."\n";
         $output .= '"Content-Type: text/plain; charset=UTF-8\n"'."\n";
         $output .= '"Content-Transfer-Encoding: 8bit\n"'."\n";
         $output .= '"Language: '.$messages->getLocale().'\n"'."\n";
         $output .= "\n";
 
         $newLine = false;
         foreach ($messages->all($domain) as $source => $target) {
             if ($newLine) {
                 $output .= "\n";
             } else {
                 $newLine = true;
             }
             $metadata = $messages->getMetadata($source, $domain);
 
             if (isset($metadata['comments'])) {
                 $output .= $this->formatComments($metadata['comments']);
             }
             if (isset($metadata['flags'])) {
                 $output .= $this->formatComments(implode(',', (array) $metadata['flags']), ',');
             }
             if (isset($metadata['sources'])) {
                 $output .= $this->formatComments(implode(' ', (array) $metadata['sources']), ':');
             }
 
             $output .= sprintf('msgid "%s"'."\n", $this->escape($source));
             $output .= sprintf('msgstr "%s"'."\n", $this->escape($target));
         }
 
         return $output;
     }
 
     /**
      * {@inheritdoc}
      */
     protected function getExtension()
     {
         return 'po';
     }
 
     private function escape($str)
     {
         return addcslashes($str, "\0..\37\42\134");
     }
 
     private function formatComments($comments, string $prefix = ''): ?string
     {
         $output = null;
 
         foreach ((array) $comments as $comment) {
             $output .= sprintf('#%s %s'."\n", $prefix, $comment);
         }
 
         return $output;
     }
 }