<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <[email protected]>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Console\Helper;
use Symfony\Component\Console\Cursor;
use Symfony\Component\Console\Exception\MissingInputException;
use Symfony\Component\Console\Exception\RuntimeException;
use Symfony\Component\Console\Formatter\OutputFormatter;
use Symfony\Component\Console\Formatter\OutputFormatterStyle;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Input\StreamableInputInterface;
use Symfony\Component\Console\Output\ConsoleOutputInterface;
use Symfony\Component\Console\Output\ConsoleSectionOutput;
use Symfony\Component\Console\Output\OutputInterface;
use Symfony\Component\Console\Question\ChoiceQuestion;
use Symfony\Component\Console\Question\Question;
use Symfony\Component\Console\Terminal;
use function Symfony\Component\String\s;
/**
* The QuestionHelper class provides helpers to interact with the user.
*
* @author Fabien Potencier <[email protected]>
*/
class QuestionHelper extends Helper
{
private $inputStream;
private static $shell;
private static $stty = true;
private static $stdinIsInteractive;
/**
* Asks a question to the user.
*
* @return mixed The user answer
*
* @throws RuntimeException If there is no data to read in the input stream
*/
public function ask(InputInterface $input, OutputInterface $output, Question $question)
{
if ($output instanceof ConsoleOutputInterface) {
$output = $output->getErrorOutput();
}
if (!$input->isInteractive()) {
return $this->getDefaultAnswer($question);
}
if ($input instanceof StreamableInputInterface && $stream = $input->getStream()) {
$this->inputStream = $stream;
}
try {
if (!$question->getValidator()) {
return $this->doAsk($output, $question);
}
$interviewer = function () use ($output, $question) {
return $this->doAsk($output, $question);
};
return $this->validateAttempts($interviewer, $output, $question);
} catch (MissingInputException $exception) {
$input->setInteractive(false);
if (null === $fallbackOutput = $this->getDefaultAnswer($question)) {
throw $exception;
}
return $fallbackOutput;
}
}
/**
* {@inheritdoc}
*/
public function getName()
{
return 'question';
}
/**
* Prevents usage of stty.
*/
public static function disableStty()
{
self::$stty = false;
}
/**
* Asks the question to the user.
*
* @return mixed
*
* @throws RuntimeException In case the fallback is deactivated and the response cannot be hidden
*/
private function doAsk(OutputInterface $output, Question $question)
{
$this->writePrompt($output, $question);
$inputStream = $this->inputStream ?: \STDIN;
$autocomplete = $question->getAutocompleterCallback();
if (\function_exists('sapi_windows_cp_set')) {
// Codepage used by cmd.exe on Windows to allow special characters (éàüñ).
@sapi_windows_cp_set(1252);
}
if (null === $autocomplete || !self::$stty || !Terminal::hasSttyAvailable()) {
$ret = false;
if ($question->isHidden()) {
try {
$hiddenResponse = $this->getHiddenResponse($output, $inputStream, $question->isTrimmable());
$ret = $question->isTrimmable() ? trim($hiddenResponse) : $hiddenResponse;
} catch (RuntimeException $e) {
if (!$question->isHiddenFallback()) {
throw $e;
}
}
}
if (false === $ret) {
$ret = $this->readInput($inputStream, $question);
if (false === $ret) {
throw new MissingInputException('Aborted.');
}
if ($question->isTrimmable()) {
$ret = trim($ret);
}
}
} else {
$autocomplete = $this->autocomplete($output, $question, $inputStream, $autocomplete);
$ret = $question->isTrimmable() ? trim($autocomplete) : $autocomplete;
}
if ($output instanceof ConsoleSectionOutput) {
$output->addContent($ret);
}
$ret = \strlen($ret) > 0 ? $ret : $question->getDefault();
if ($normalizer = $question->getNormalizer()) {
return $normalizer($ret);
}
return $ret;
}
/**
* @return mixed
*/
private function getDefaultAnswer(Question $question)
{
$default = $question->getDefault();
if (null === $default) {
return $default;
}
if ($validator = $question->getValidator()) {
return \call_user_func($question->getValidator(), $default);
} elseif ($question instanceof ChoiceQuestion) {
$choices = $question->getChoices();
if (!$question->isMultiselect()) {
return $choices[$default] ?? $default;
}
$default = explode(',', $default);
foreach ($default as $k => $v) {
$v = $question->isTrimmable() ? trim($v) : $v;
$default[$k] = $choices[$v] ?? $v;
}
}
return $default;
}
/**
* Outputs the question prompt.
*/
protected function writePrompt(OutputInterface $output, Question $question)
{
$message = $question->getQuestion();
if ($question instanceof ChoiceQuestion) {
$output->writeln(array_merge([
$question->getQuestion(),
], $this->formatChoiceQuestionChoices($question, 'info')));
$message = $question->getPrompt();
}
$output->write($message);
}
/**
* @return string[]
*/
protected function formatChoiceQuestionChoices(ChoiceQuestion $question, string $tag)
{
$messages = [];
$maxWidth = max(array_map('self::strlen', array_keys($choices = $question->getChoices())));
foreach ($choices as $key => $value) {
$padding = str_repeat(' ', $maxWidth - self::strlen($key));
$messages[] = sprintf(" [<$tag>%s$padding</$tag>] %s", $key, $value);
}
return $messages;
}
/**
* Outputs an error message.
*/
protected function writeError(OutputInterface $output, \Exception $error)
{
if (null !== $this->getHelperSet() && $this->getHelperSet()->has('formatter')) {
$message = $this->getHelperSet()->get('formatter')->formatBlock($error->getMessage(), 'error');
} else {
$message = '<error>'.$error->getMessage().'</error>';
}
$output->writeln($message);
}
/**
* Autocompletes a question.
*
* @param resource $inputStream
*/
private function autocomplete(OutputInterface $output, Question $question, $inputStream, callable $autocomplete): string
{
$cursor = new Cursor($output, $inputStream);
$fullChoice = '';
$ret = '';
$i = 0;
$ofs = -1;
$matches = $autocomplete($ret);
$numMatches = \count($matches);
$sttyMode = shell_exec('stty -g');
// Disable icanon (so we can fread each keypress) and echo (we'll do echoing here instead)
shell_exec('stty -icanon -echo');
// Add highlighted text style
$output->getFormatter()->setStyle('hl', new OutputFormatterStyle('black', 'white'));
// Read a keypress
while (!feof($inputStream)) {
$c = fread($inputStream, 1);
// as opposed to fgets(), fread() returns an empty string when the stream content is empty, not false.
if (false === $c || ('' === $ret && '' === $c && null === $question->getDefault())) {
shell_exec(sprintf('stty %s', $sttyMode));
throw new MissingInputException('Aborted.');
} elseif ("\177" === $c) { // Backspace Character
if (0 === $numMatches && 0 !== $i) {
--$i;
$cursor->moveLeft(s($fullChoice)->slice(-1)->width(false));
$fullChoice = self::substr($fullChoice, 0, $i);
}
if (0 === $i) {
$ofs = -1;
$matches = $autocomplete($ret);
$numMatches = \count($matches);
} else {
$numMatches = 0;
}
// Pop the last character off the end of our string
$ret = self::substr($ret, 0, $i);
} elseif ("\033" === $c) {
// Did we read an escape sequence?
$c .= fread($inputStream, 2);
// A = Up Arrow. B = Down Arrow
if (isset($c[2]) && ('A' === $c[2] || 'B' === $c[2])) {
if ('A' === $c[2] && -1 === $ofs) {
$ofs = 0;
}
if (0 === $numMatches) {
continue;
}
$ofs += ('A' === $c[2]) ? -1 : 1;
$ofs = ($numMatches + $ofs) % $numMatches;
}
} elseif (\ord($c) < 32) {
if ("\t" === $c || "\n" === $c) {
if ($numMatches > 0 && -1 !== $ofs) {
$ret = (string) $matches[$ofs];
// Echo out remaining chars for current match
$remainingCharacters = substr($ret, \strlen(trim($this->mostRecentlyEnteredValue($fullChoice))));
$output->write($remainingCharacters);
$fullChoice .= $remainingCharacters;
$i = (false === $encoding = mb_detect_encoding($fullChoice, null, true)) ? \strlen($fullChoice) : mb_strlen($fullChoice, $encoding);
$matches = array_filter(
$autocomplete($ret),
function ($match) use ($ret) {
return '' === $ret || 0 === strpos($match, $ret);
}
);
$numMatches = \count($matches);
$ofs = -1;
}
if ("\n" === $c) {
$output->write($c);
break;
}
$numMatches = 0;
}
continue;
} else {
if ("\x80" <= $c) {
$c .= fread($inputStream, ["\xC0" => 1, "\xD0" => 1, "\xE0" => 2, "\xF0" => 3][$c & "\xF0"]);
}
$output->write($c);
$ret .= $c;
$fullChoice .= $c;
++$i;
$tempRet = $ret;
if ($question instanceof ChoiceQuestion && $question->isMultiselect()) {
$tempRet = $this->mostRecentlyEnteredValue($fullChoice);
}
$numMatches = 0;
$ofs = 0;
foreach ($autocomplete($ret) as $value) {
// If typed characters match the beginning chunk of value (e.g. [AcmeDe]moBundle)
if (0 === strpos($value, $tempRet)) {
$matches[$numMatches++] = $value;
}
}
}
$cursor->clearLineAfter();
if ($numMatches > 0 && -1 !== $ofs) {
$cursor->savePosition();
// Write highlighted text, complete the partially entered response
$charactersEntered = \strlen(trim($this->mostRecentlyEnteredValue($fullChoice)));
$output->write('<hl>'.OutputFormatter::escapeTrailingBackslash(substr($matches[$ofs], $charactersEntered)).'</hl>');
$cursor->restorePosition();
}
}
// Reset stty so it behaves normally again
shell_exec(sprintf('stty %s', $sttyMode));
return $fullChoice;
}
private function mostRecentlyEnteredValue(string $entered): string
{
// Determine the most recent value that the user entered
if (false === strpos($entered, ',')) {
return $entered;
}
$choices = explode(',', $entered);
if (\strlen($lastChoice = trim($choices[\count($choices) - 1])) > 0) {
return $lastChoice;
}
return $entered;
}
/**
* Gets a hidden response from user.
*
* @param resource $inputStream The handler resource
* @param bool $trimmable Is the answer trimmable
*
* @throws RuntimeException In case the fallback is deactivated and the response cannot be hidden
*/
private function getHiddenResponse(OutputInterface $output, $inputStream, bool $trimmable = true): string
{
if ('\\' === \DIRECTORY_SEPARATOR) {
$exe = __DIR__.'/../Resources/bin/hiddeninput.exe';
// handle code running from a phar
if ('phar:' === substr(__FILE__, 0, 5)) {
$tmpExe = sys_get_temp_dir().'/hiddeninput.exe';
copy($exe, $tmpExe);
$exe = $tmpExe;
}
$sExec = shell_exec('"'.$exe.'"');
$value = $trimmable ? rtrim($sExec) : $sExec;
$output->writeln('');
if (isset($tmpExe)) {
unlink($tmpExe);
}
return $value;
}
if (self::$stty && Terminal::hasSttyAvailable()) {
$sttyMode = shell_exec('stty -g');
shell_exec('stty -echo');
} elseif ($this->isInteractiveInput($inputStream)) {
throw new RuntimeException('Unable to hide the response.');
}
$value = fgets($inputStream, 4096);
if (self::$stty && Terminal::hasSttyAvailable()) {
shell_exec(sprintf('stty %s', $sttyMode));
}
if (false === $value) {
throw new MissingInputException('Aborted.');
}
if ($trimmable) {
$value = trim($value);
}
$output->writeln('');
return $value;
}
/**
* Validates an attempt.
*
* @param callable $interviewer A callable that will ask for a question and return the result
*
* @return mixed The validated response
*
* @throws \Exception In case the max number of attempts has been reached and no valid response has been given
*/
private function validateAttempts(callable $interviewer, OutputInterface $output, Question $question)
{
$error = null;
$attempts = $question->getMaxAttempts();
while (null === $attempts || $attempts--) {
if (null !== $error) {
$this->writeError($output, $error);
}
try {
return $question->getValidator()($interviewer());
} catch (RuntimeException $e) {
throw $e;
} catch (\Exception $error) {
}
}
throw $error;
}
private function isInteractiveInput($inputStream): bool
{
if ('php://stdin' !== (stream_get_meta_data($inputStream)['uri'] ?? null)) {
return false;
}
if (null !== self::$stdinIsInteractive) {
return self::$stdinIsInteractive;
}
if (\function_exists('stream_isatty')) {
return self::$stdinIsInteractive = stream_isatty(fopen('php://stdin', 'r'));
}
if (\function_exists('posix_isatty')) {
return self::$stdinIsInteractive = posix_isatty(fopen('php://stdin', 'r'));
}
if (!\function_exists('exec')) {
return self::$stdinIsInteractive = true;
}
exec('stty 2> /dev/null', $output, $status);
return self::$stdinIsInteractive = 1 !== $status;
}
/**
* Reads one or more lines of input and returns what is read.
*
* @param resource $inputStream The handler resource
* @param Question $question The question being asked
*
* @return string|bool The input received, false in case input could not be read
*/
private function readInput($inputStream, Question $question)
{
if (!$question->isMultiline()) {
return fgets($inputStream, 4096);
}
$multiLineStreamReader = $this->cloneInputStream($inputStream);
if (null === $multiLineStreamReader) {
return false;
}
$ret = '';
while (false !== ($char = fgetc($multiLineStreamReader))) {
if (\PHP_EOL === "{$ret}{$char}") {
break;
}
$ret .= $char;
}
return $ret;
}
/**
* Clones an input stream in order to act on one instance of the same
* stream without affecting the other instance.
*
* @param resource $inputStream The handler resource
*
* @return resource|null The cloned resource, null in case it could not be cloned
*/
private function cloneInputStream($inputStream)
{
$streamMetaData = stream_get_meta_data($inputStream);
$seekable = $streamMetaData['seekable'] ?? false;
$mode = $streamMetaData['mode'] ?? 'rb';
$uri = $streamMetaData['uri'] ?? null;
if (null === $uri) {
return null;
}
$cloneStream = fopen($uri, $mode);
// For seekable and writable streams, add all the same data to the
// cloned stream and then seek to the same offset.
if (true === $seekable && !\in_array($mode, ['r', 'rb', 'rt'])) {
$offset = ftell($inputStream);
rewind($inputStream);
stream_copy_to_stream($inputStream, $cloneStream);
fseek($inputStream, $offset);
fseek($cloneStream, $offset);
}
return $cloneStream;
}
}