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Edit File : QuestionHelper.php \| Size : 16.86 KB
<?php /* * This file is part of the Symfony package. * * (c) Fabien Potencier <fabien@symfony.com> * * 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\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; /* * The QuestionHelper class provides helpers to interact with the user. * * @author Fabien Potencier <fabien@symfony.com> / 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 (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) { $cp = $this->setIOCodepage(); $ret = fgets($inputStream, 4096); $ret = $this->resetIOCodepage($cp, $ret); 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); } /* * @param string $tag * * @return string[] / protected function formatChoiceQuestionChoices(ChoiceQuestion $question, $tag) { $messages = []; $maxWidth = max(array_map([__CLASS__, 'strlen'], array_keys($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 { $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; $fullChoice = self::substr($fullChoice, 0, $i); // Move cursor backwards $output->write("\033[1D"); } 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 '' === $ret \|\| str_starts_with($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 $value) { // If typed characters match the beginning chunk of value (e.g. [AcmeDe]moBundle) if (str_starts_with($value, $tempRet)) { $matches[$numMatches++] = $value; } } } // Erase characters from cursor to end of line $output->write("\033[K"); if ($numMatches > 0 && -1 !== $ofs) { // Save cursor position $output->write("\0337"); // Write highlighted text, complete the partially entered response $charactersEntered = \strlen(trim($this->mostRecentlyEnteredValue($fullChoice))); $output->write('<hl>'.OutputFormatter::escapeTrailingBackslash(substr($matches[$ofs], $charactersEntered)).'</hl>'); // Restore cursor position $output->write("\0338"); } } // Reset stty so it behaves normally again shell_exec(sprintf('stty %s', $sttyMode)); return $fullChoice; } private function mostRecentlyEnteredValue(string $entered): string { // Determine the most recent value that the user entered if (!str_contains($entered, ',')) { return $entered; } $choices = explode(',', $entered); if ('' !== $lastChoice = trim($choices[\count($choices) - 1])) { 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; } /* * Sets console I/O to the host code page. * * @return int Previous code page in IBM/EBCDIC format / private function setIOCodepage(): int { if (\function_exists('sapi_windows_cp_set')) { $cp = sapi_windows_cp_get(); sapi_windows_cp_set(sapi_windows_cp_get('oem')); return $cp; } return 0; } /* * Sets console I/O to the specified code page and converts the user input. * * @param string\|false $input * * @return string\|false */ private function resetIOCodepage(int $cp, $input) { if (0 !== $cp) { sapi_windows_cp_set($cp); if (false !== $input && '' !== $input) { $input = sapi_windows_cp_conv(sapi_windows_cp_get('oem'), $cp, $input); } } return $input; } } Back

Edit File : QuestionHelper.php | Size : 16.86 KB

<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * 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\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;

/**
 * The QuestionHelper class provides helpers to interact with the user.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 */
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 (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) {
                $cp = $this->setIOCodepage();
                $ret = fgets($inputStream, 4096);
                $ret = $this->resetIOCodepage($cp, $ret);
                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);
    }

/**
     * @param string $tag
     *
     * @return string[]
     */
    protected function formatChoiceQuestionChoices(ChoiceQuestion $question, $tag)
    {
        $messages = [];

$maxWidth = max(array_map([__CLASS__, 'strlen'], array_keys($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
    {
        $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;
                    $fullChoice = self::substr($fullChoice, 0, $i);
                    // Move cursor backwards
                    $output->write("\033[1D");
                }

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 '' === $ret || str_starts_with($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 $value) {
                    // If typed characters match the beginning chunk of value (e.g. [AcmeDe]moBundle)
                    if (str_starts_with($value, $tempRet)) {
                        $matches[$numMatches++] = $value;
                    }
                }
            }

// Erase characters from cursor to end of line
            $output->write("\033[K");

if ($numMatches > 0 && -1 !== $ofs) {
                // Save cursor position
                $output->write("\0337");
                // Write highlighted text, complete the partially entered response
                $charactersEntered = \strlen(trim($this->mostRecentlyEnteredValue($fullChoice)));
                $output->write('<hl>'.OutputFormatter::escapeTrailingBackslash(substr($matches[$ofs], $charactersEntered)).'</hl>');
                // Restore cursor position
                $output->write("\0338");
            }
        }

// Reset stty so it behaves normally again
        shell_exec(sprintf('stty %s', $sttyMode));

return $fullChoice;
    }

private function mostRecentlyEnteredValue(string $entered): string
    {
        // Determine the most recent value that the user entered
        if (!str_contains($entered, ',')) {
            return $entered;
        }

$choices = explode(',', $entered);
        if ('' !== $lastChoice = trim($choices[\count($choices) - 1])) {
            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;
    }

/**
     * Sets console I/O to the host code page.
     *
     * @return int Previous code page in IBM/EBCDIC format
     */
    private function setIOCodepage(): int
    {
        if (\function_exists('sapi_windows_cp_set')) {
            $cp = sapi_windows_cp_get();
            sapi_windows_cp_set(sapi_windows_cp_get('oem'));

return $cp;
        }

return 0;
    }

/**
     * Sets console I/O to the specified code page and converts the user input.
     *
     * @param string|false $input
     *
     * @return string|false
     */
    private function resetIOCodepage(int $cp, $input)
    {
        if (0 !== $cp) {
            sapi_windows_cp_set($cp);

if (false !== $input && '' !== $input) {
                $input = sapi_windows_cp_conv(sapi_windows_cp_get('oem'), $cp, $input);
            }
        }

return $input;
    }
}

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