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   1  <?php
   2  
   3  /*
   4   * This file is part of the Symfony package.
   5   *
   6   * (c) Fabien Potencier <fabien@symfony.com>
   7   *
   8   * For the full copyright and license information, please view the LICENSE
   9   * file that was distributed with this source code.
  10   */
  11  
  12  namespace Symfony\Component\Console\Question;
  13  
  14  /**
  15   * Represents a yes/no question.
  16   *
  17   * @author Fabien Potencier <fabien@symfony.com>
  18   */
  19  class ConfirmationQuestion extends Question
  20  {
  21      private $trueAnswerRegex;
  22  
  23      /**
  24       * @param string $question        The question to ask to the user
  25       * @param bool   $default         The default answer to return, true or false
  26       * @param string $trueAnswerRegex A regex to match the "yes" answer
  27       */
  28      public function __construct($question, $default = true, $trueAnswerRegex = '/^y/i')
  29      {
  30          parent::__construct($question, (bool) $default);
  31  
  32          $this->trueAnswerRegex = $trueAnswerRegex;
  33          $this->setNormalizer($this->getDefaultNormalizer());
  34      }
  35  
  36      /**
  37       * Returns the default answer normalizer.
  38       *
  39       * @return callable
  40       */
  41      private function getDefaultNormalizer()
  42      {
  43          $default = $this->getDefault();
  44          $regex = $this->trueAnswerRegex;
  45  
  46          return function ($answer) use ($default, $regex) {
  47              if (\is_bool($answer)) {
  48                  return $answer;
  49              }
  50  
  51              $answerIsTrue = (bool) preg_match($regex, $answer);
  52              if (false === $default) {
  53                  return $answer && $answerIsTrue;
  54              }
  55  
  56              return '' === $answer || $answerIsTrue;
  57          };
  58      }
  59  }