Symfony\Component\Console\Formatter\OutputFormatter::escapeTrailingBackslash PHP Метод

    public static function escapeTrailingBackslash($text)
    {
        if ('\\' === substr($text, -1)) {
            $len = strlen($text);
            $text = rtrim($text, '\\');
            $text .= str_repeat('<<', $len - strlen($text));
        }
        return $text;
    }

 /**
  * {@inheritdoc}
  */
 protected function writePrompt(OutputInterface $output, Question $question)
 {
     $text = OutputFormatter::escapeTrailingBackslash($question->getQuestion());
     $default = $question->getDefault();
     switch (true) {
         case null === $default:
             $text = sprintf(' <info>%s</info>:', $text);
             break;
         case $question instanceof ConfirmationQuestion:
             $text = sprintf(' <info>%s (yes/no)</info> [<comment>%s</comment>]:', $text, $default ? 'yes' : 'no');
             break;
         case $question instanceof ChoiceQuestion && $question->isMultiselect():
             $choices = $question->getChoices();
             $default = explode(',', $default);
             foreach ($default as $key => $value) {
                 $default[$key] = $choices[trim($value)];
             }
             $text = sprintf(' <info>%s</info> [<comment>%s</comment>]:', $text, OutputFormatter::escape(implode(', ', $default)));
             break;
         case $question instanceof ChoiceQuestion:
             $choices = $question->getChoices();
             $text = sprintf(' <info>%s</info> [<comment>%s</comment>]:', $text, OutputFormatter::escape($choices[$default]));
             break;
         default:
             $text = sprintf(' <info>%s</info> [<comment>%s</comment>]:', $text, OutputFormatter::escape($default));
     }
     $output->writeln($text);
     if ($question instanceof ChoiceQuestion) {
         $width = max(array_map('strlen', array_keys($question->getChoices())));
         foreach ($question->getChoices() as $key => $value) {
             $output->writeln(sprintf("  [<comment>%-{$width}s</comment>] %s", $key, $value));
         }
     }
     $output->write(' > ');
 }