448 lines
13 KiB
PHP
448 lines
13 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\Exception\InvalidArgumentException;
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use Symfony\Component\Console\Exception\RuntimeException;
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use Symfony\Component\Console\Input\InputInterface;
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use Symfony\Component\Console\Output\ConsoleOutputInterface;
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use Symfony\Component\Console\Output\OutputInterface;
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use Symfony\Component\Console\Formatter\OutputFormatterStyle;
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use Symfony\Component\Console\Question\Question;
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use Symfony\Component\Console\Question\ChoiceQuestion;
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/**
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* The QuestionHelper 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 QuestionHelper extends Helper
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{
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private $inputStream;
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private static $shell;
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private static $stty;
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/**
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* Asks a question to the user.
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*
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* @param InputInterface $input An InputInterface instance
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* @param OutputInterface $output An OutputInterface instance
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* @param Question $question The question to ask
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*
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* @return string The user answer
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*
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* @throws RuntimeException If there is no data to read in the input stream
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*/
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public function ask(InputInterface $input, OutputInterface $output, Question $question)
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{
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if ($output instanceof ConsoleOutputInterface) {
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$output = $output->getErrorOutput();
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}
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if (!$input->isInteractive()) {
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return $question->getDefault();
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}
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if (!$question->getValidator()) {
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return $this->doAsk($output, $question);
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}
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$interviewer = function () use ($output, $question) {
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return $this->doAsk($output, $question);
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};
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return $this->validateAttempts($interviewer, $output, $question);
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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 $stream The input stream
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*
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* @throws InvalidArgumentException In case the stream is not a resource
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*/
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public function setInputStream($stream)
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{
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if (!is_resource($stream)) {
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throw new InvalidArgumentException('Input stream must be a valid resource.');
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}
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$this->inputStream = $stream;
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}
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/**
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* Returns the helper's input stream.
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*
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* @return resource
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*/
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public function getInputStream()
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{
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return $this->inputStream;
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}
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/**
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* {@inheritdoc}
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*/
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public function getName()
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{
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return 'question';
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}
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/**
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* Asks the question to the user.
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*
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* @param OutputInterface $output
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* @param Question $question
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*
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* @return bool|mixed|null|string
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*
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* @throws \Exception
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* @throws \RuntimeException
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*/
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private function doAsk(OutputInterface $output, Question $question)
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{
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$this->writePrompt($output, $question);
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$inputStream = $this->inputStream ?: STDIN;
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$autocomplete = $question->getAutocompleterValues();
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if (null === $autocomplete || !$this->hasSttyAvailable()) {
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$ret = false;
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if ($question->isHidden()) {
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try {
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$ret = trim($this->getHiddenResponse($output, $inputStream));
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} catch (\RuntimeException $e) {
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if (!$question->isHiddenFallback()) {
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throw $e;
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}
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}
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}
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if (false === $ret) {
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$ret = fgets($inputStream, 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($ret);
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}
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} else {
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$ret = trim($this->autocomplete($output, $question, $inputStream));
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}
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$ret = strlen($ret) > 0 ? $ret : $question->getDefault();
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if ($normalizer = $question->getNormalizer()) {
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return $normalizer($ret);
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}
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return $ret;
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}
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/**
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* Outputs the question prompt.
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*
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* @param OutputInterface $output
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* @param Question $question
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*/
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protected function writePrompt(OutputInterface $output, Question $question)
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{
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$message = $question->getQuestion();
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if ($question instanceof ChoiceQuestion) {
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$maxWidth = max(array_map(array($this, 'strlen'), array_keys($question->getChoices())));
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$messages = (array) $question->getQuestion();
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foreach ($question->getChoices() as $key => $value) {
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$width = $maxWidth - $this->strlen($key);
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$messages[] = ' [<info>'.$key.str_repeat(' ', $width).'</info>] '.$value;
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}
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$output->writeln($messages);
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$message = $question->getPrompt();
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}
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$output->write($message);
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}
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/**
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* Outputs an error message.
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*
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* @param OutputInterface $output
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* @param \Exception $error
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*/
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protected function writeError(OutputInterface $output, \Exception $error)
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{
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if (null !== $this->getHelperSet() && $this->getHelperSet()->has('formatter')) {
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$message = $this->getHelperSet()->get('formatter')->formatBlock($error->getMessage(), 'error');
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} else {
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$message = '<error>'.$error->getMessage().'</error>';
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}
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$output->writeln($message);
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}
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/**
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* Autocompletes a question.
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*
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* @param OutputInterface $output
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* @param Question $question
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* @param resource $inputStream
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*
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* @return string
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*/
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private function autocomplete(OutputInterface $output, Question $question, $inputStream)
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{
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$autocomplete = $question->getAutocompleterValues();
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$ret = '';
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$i = 0;
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$ofs = -1;
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$matches = $autocomplete;
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$numMatches = count($matches);
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$sttyMode = shell_exec('stty -g');
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// Disable icanon (so we can fread each keypress) and echo (we'll do echoing here instead)
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shell_exec('stty -icanon -echo');
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// Add highlighted text style
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$output->getFormatter()->setStyle('hl', new OutputFormatterStyle('black', 'white'));
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// Read a keypress
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while (!feof($inputStream)) {
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$c = fread($inputStream, 1);
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// Backspace Character
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if ("\177" === $c) {
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if (0 === $numMatches && 0 !== $i) {
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--$i;
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// Move cursor backwards
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$output->write("\033[1D");
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}
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if ($i === 0) {
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$ofs = -1;
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$matches = $autocomplete;
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$numMatches = count($matches);
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} else {
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$numMatches = 0;
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}
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// Pop the last character off the end of our string
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$ret = substr($ret, 0, $i);
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} elseif ("\033" === $c) {
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// Did we read an escape sequence?
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$c .= fread($inputStream, 2);
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// A = Up Arrow. B = Down Arrow
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if (isset($c[2]) && ('A' === $c[2] || 'B' === $c[2])) {
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if ('A' === $c[2] && -1 === $ofs) {
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$ofs = 0;
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}
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if (0 === $numMatches) {
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continue;
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}
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$ofs += ('A' === $c[2]) ? -1 : 1;
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$ofs = ($numMatches + $ofs) % $numMatches;
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}
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} elseif (ord($c) < 32) {
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if ("\t" === $c || "\n" === $c) {
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if ($numMatches > 0 && -1 !== $ofs) {
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$ret = $matches[$ofs];
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// Echo out remaining chars for current match
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$output->write(substr($ret, $i));
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$i = strlen($ret);
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}
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if ("\n" === $c) {
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$output->write($c);
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break;
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}
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$numMatches = 0;
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}
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continue;
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} else {
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$output->write($c);
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$ret .= $c;
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++$i;
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$numMatches = 0;
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$ofs = 0;
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foreach ($autocomplete as $value) {
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// If typed characters match the beginning chunk of value (e.g. [AcmeDe]moBundle)
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if (0 === strpos($value, $ret) && $i !== strlen($value)) {
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$matches[$numMatches++] = $value;
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}
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}
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}
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// Erase characters from cursor to end of line
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$output->write("\033[K");
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if ($numMatches > 0 && -1 !== $ofs) {
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// Save cursor position
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$output->write("\0337");
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// Write highlighted text
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$output->write('<hl>'.substr($matches[$ofs], $i).'</hl>');
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// Restore cursor position
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$output->write("\0338");
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}
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}
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// Reset stty so it behaves normally again
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shell_exec(sprintf('stty %s', $sttyMode));
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return $ret;
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}
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/**
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* Gets a hidden response from user.
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*
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* @param OutputInterface $output An Output instance
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* @param resource $inputStream The handler resource
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*
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* @return string The answer
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*
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* @throws RuntimeException In case the fallback is deactivated and the response cannot be hidden
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*/
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private function getHiddenResponse(OutputInterface $output, $inputStream)
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{
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if ('\\' === DIRECTORY_SEPARATOR) {
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$exe = __DIR__.'/../Resources/bin/hiddeninput.exe';
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// handle code running from a phar
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if ('phar:' === substr(__FILE__, 0, 5)) {
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$tmpExe = sys_get_temp_dir().'/hiddeninput.exe';
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copy($exe, $tmpExe);
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$exe = $tmpExe;
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}
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$value = rtrim(shell_exec($exe));
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$output->writeln('');
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if (isset($tmpExe)) {
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unlink($tmpExe);
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}
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return $value;
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}
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if ($this->hasSttyAvailable()) {
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$sttyMode = shell_exec('stty -g');
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shell_exec('stty -echo');
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$value = fgets($inputStream, 4096);
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shell_exec(sprintf('stty %s', $sttyMode));
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if (false === $value) {
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throw new RuntimeException('Aborted');
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}
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$value = trim($value);
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$output->writeln('');
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return $value;
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}
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if (false !== $shell = $this->getShell()) {
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$readCmd = $shell === 'csh' ? 'set mypassword = $<' : 'read -r mypassword';
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$command = sprintf("/usr/bin/env %s -c 'stty -echo; %s; stty echo; echo \$mypassword'", $shell, $readCmd);
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$value = rtrim(shell_exec($command));
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$output->writeln('');
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return $value;
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}
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throw new RuntimeException('Unable to hide the response.');
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}
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/**
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* Validates an attempt.
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*
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* @param callable $interviewer A callable that will ask for a question and return the result
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* @param OutputInterface $output An Output instance
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* @param Question $question A Question instance
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*
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* @return string The validated response
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*
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* @throws \Exception In case the max number of attempts has been reached and no valid response has been given
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*/
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private function validateAttempts(callable $interviewer, OutputInterface $output, Question $question)
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{
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$error = null;
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$attempts = $question->getMaxAttempts();
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while (null === $attempts || $attempts--) {
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if (null !== $error) {
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$this->writeError($output, $error);
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}
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try {
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return call_user_func($question->getValidator(), $interviewer());
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} catch (\Exception $error) {
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}
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}
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throw $error;
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}
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/**
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* Returns a valid unix shell.
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*
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* @return string|bool The valid shell name, false in case no valid shell is found
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*/
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private function getShell()
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{
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if (null !== self::$shell) {
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return self::$shell;
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}
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self::$shell = false;
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if (file_exists('/usr/bin/env')) {
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// handle other OSs with bash/zsh/ksh/csh if available to hide the answer
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$test = "/usr/bin/env %s -c 'echo OK' 2> /dev/null";
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foreach (array('bash', 'zsh', 'ksh', 'csh') as $sh) {
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if ('OK' === rtrim(shell_exec(sprintf($test, $sh)))) {
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self::$shell = $sh;
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break;
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}
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}
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}
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return self::$shell;
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}
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/**
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* Returns whether Stty is available or not.
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*
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* @return bool
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*/
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private function hasSttyAvailable()
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{
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if (null !== self::$stty) {
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return self::$stty;
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}
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exec('stty 2>&1', $output, $exitcode);
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return self::$stty = $exitcode === 0;
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}
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}
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