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
12namespace Symfony\Component\Console\Question;
13
14/**
15 * Represents a yes/no question.
16 *
17 * @author Fabien Potencier <fabien@symfony.com>
18 */
19class 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(string $question, bool $default = true, string $trueAnswerRegex = '/^y/i')
29    {
30        parent::__construct($question, $default);
31
32        $this->trueAnswerRegex = $trueAnswerRegex;
33        $this->setNormalizer($this->getDefaultNormalizer());
34    }
35
36    /**
37     * Returns the default answer normalizer.
38     */
39    private function getDefaultNormalizer(): callable
40    {
41        $default = $this->getDefault();
42        $regex = $this->trueAnswerRegex;
43
44        return function ($answer) use ($default, $regex) {
45            if (\is_bool($answer)) {
46                return $answer;
47            }
48
49            $answerIsTrue = (bool) preg_match($regex, $answer);
50            if (false === $default) {
51                return $answer && $answerIsTrue;
52            }
53
54            return '' === $answer || $answerIsTrue;
55        };
56    }
57}
58