128 lines
3.6 KiB
PHP
128 lines
3.6 KiB
PHP
<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\Console\Helper;
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use Symfony\Component\Console\Output\OutputInterface;
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/**
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* The Dialog class provides helpers to interact with the user.
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*
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* @author Fabien Potencier <fabien@symfony.com>
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*/
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class DialogHelper extends Helper
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{
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private $inputStream;
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/**
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* Asks a question to the user.
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*
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* @param OutputInterface $output
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* @param string|array $question The question to ask
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* @param string $default The default answer if none is given by the user
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*
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* @return string The user answer
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*/
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public function ask(OutputInterface $output, $question, $default = null)
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{
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$output->write($question);
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$ret = fgets($this->inputStream ?: STDIN, 4096);
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if (false === $ret) {
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throw new \RuntimeException('Aborted');
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}
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$ret = trim($ret);
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return strlen($ret) > 0 ? $ret : $default;
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}
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/**
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* Asks a confirmation to the user.
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*
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* The question will be asked until the user answer by nothing, yes, or no.
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*
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* @param OutputInterface $output
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* @param string|array $question The question to ask
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* @param Boolean $default The default answer if the user enters nothing
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*
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* @return Boolean true if the user has confirmed, false otherwise
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*/
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public function askConfirmation(OutputInterface $output, $question, $default = true)
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{
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$answer = 'z';
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while ($answer && !in_array(strtolower($answer[0]), array('y', 'n'))) {
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$answer = $this->ask($output, $question);
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}
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if (false === $default) {
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return $answer && 'y' == strtolower($answer[0]);
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}
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return !$answer || 'y' == strtolower($answer[0]);
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}
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/**
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* Asks for a value and validates the response.
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*
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* The validator receives the data to validate. It must return the
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* validated data when the data is valid and throw an exception
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* otherwise.
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*
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* @param OutputInterface $output
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* @param string|array $question
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* @param callback $validator A PHP callback
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* @param integer $attempts Max number of times to ask before giving up (false by default, which means infinite)
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* @param string $default The default answer if none is given by the user
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*
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* @return mixed
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*
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* @throws \Exception When any of the validator returns an error
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*/
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public function askAndValidate(OutputInterface $output, $question, $validator, $attempts = false, $default = null)
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{
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$error = null;
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while (false === $attempts || $attempts--) {
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if (null !== $error) {
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$output->writeln($this->getHelperSet()->get('formatter')->formatBlock($error->getMessage(), 'error'));
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}
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$value = $this->ask($output, $question, $default);
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try {
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return call_user_func($validator, $value);
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} catch (\Exception $error) {
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}
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}
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throw $error;
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}
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/**
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* Sets the input stream to read from when interacting with the user.
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*
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* This is mainly useful for testing purpose.
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*
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* @param resource $stream The input stream
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*/
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public function setInputStream($stream)
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{
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$this->inputStream = $stream;
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}
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/**
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* Returns the helper's canonical name
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*/
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public function getName()
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{
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return 'dialog';
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}
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}
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