[Summary view] [Print] [Text view]

   1  <?php
   2  
   3  /*
   4   * This file is part of the Symfony package.
   5   *
   6   * (c) Fabien Potencier <[email protected]>
   7   *
   8   * For the full copyright and license information, please view the LICENSE
   9   * file that was distributed with this source code.
  10   */
  11  
  12  namespace Symfony\Component\Console\Output;
  13  
  14  use Symfony\Component\Console\Exception\InvalidArgumentException;
  15  use Symfony\Component\Console\Formatter\OutputFormatterInterface;
  16  
  17  /**
  18   * A BufferedOutput that keeps only the last N chars.
  19   *
  20   * @author Jérémy Derussé <[email protected]>
  21   */
  22  class TrimmedBufferOutput extends Output
  23  {
  24      private $maxLength;
  25      private $buffer = '';
  26  
  27      public function __construct(int $maxLength, ?int $verbosity = self::VERBOSITY_NORMAL, bool $decorated = false, OutputFormatterInterface $formatter = null)
  28      {
  29          if ($maxLength <= 0) {
  30              throw new InvalidArgumentException(sprintf('"%s()" expects a strictly positive maxLength. Got %d.', __METHOD__, $maxLength));
  31          }
  32  
  33          parent::__construct($verbosity, $decorated, $formatter);
  34          $this->maxLength = $maxLength;
  35      }
  36  
  37      /**
  38       * Empties buffer and returns its content.
  39       *
  40       * @return string
  41       */
  42      public function fetch()
  43      {
  44          $content = $this->buffer;
  45          $this->buffer = '';
  46  
  47          return $content;
  48      }
  49  
  50      /**
  51       * {@inheritdoc}
  52       */
  53      protected function doWrite(string $message, bool $newline)
  54      {
  55          $this->buffer .= $message;
  56  
  57          if ($newline) {
  58              $this->buffer .= \PHP_EOL;
  59          }
  60  
  61          $this->buffer = substr($this->buffer, 0 - $this->maxLength);
  62      }
  63  }