private function QuestionHelper::autocomplete in Zircon Profile 8

Same name and namespace in other branches

1. 8.0 vendor/symfony/console/Helper/QuestionHelper.php \Symfony\Component\Console\Helper\QuestionHelper::autocomplete()

Autocompletes a question.

Parameters

OutputInterface $output:

Question $question:

Return value

string

1 call to QuestionHelper::autocomplete()

QuestionHelper::doAsk in vendor/symfony/console/Helper/QuestionHelper.php

Asks the question to the user.

File

vendor/symfony/console/Helper/QuestionHelper.php, line 205

Class

QuestionHelper

The QuestionHelper class provides helpers to interact with the user.

Namespace

Symfony\Component\Console\Helper

Code

private function autocomplete(OutputInterface $output, Question $question, $inputStream) {
  $autocomplete = $question
    ->getAutocompleterValues();
  $ret = '';
  $i = 0;
  $ofs = -1;
  $matches = $autocomplete;
  $numMatches = count($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);

    // Backspace Character
    if ("" === $c) {
      if (0 === $numMatches && 0 !== $i) {
        --$i;

        // Move cursor backwards
        $output
          ->write("\33[1D");
      }
      if ($i === 0) {
        $ofs = -1;
        $matches = $autocomplete;
        $numMatches = count($matches);
      }
      else {
        $numMatches = 0;
      }

      // Pop the last character off the end of our string
      $ret = substr($ret, 0, $i);
    }
    elseif ("\33" === $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 = $matches[$ofs];

          // Echo out remaining chars for current match
          $output
            ->write(substr($ret, $i));
          $i = strlen($ret);
        }
        if ("\n" === $c) {
          $output
            ->write($c);
          break;
        }
        $numMatches = 0;
      }
      continue;
    }
    else {
      $output
        ->write($c);
      $ret .= $c;
      ++$i;
      $numMatches = 0;
      $ofs = 0;
      foreach ($autocomplete as $value) {

        // If typed characters match the beginning chunk of value (e.g. [AcmeDe]moBundle)
        if (0 === strpos($value, $ret) && $i !== strlen($value)) {
          $matches[$numMatches++] = $value;
        }
      }
    }

    // Erase characters from cursor to end of line
    $output
      ->write("\33[K");
    if ($numMatches > 0 && -1 !== $ofs) {

      // Save cursor position
      $output
        ->write("\0337");

      // Write highlighted text
      $output
        ->write('<hl>' . substr($matches[$ofs], $i) . '</hl>');

      // Restore cursor position
      $output
        ->write("\338");
    }
  }

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