code: protected function isComment(&$length)
      {
          static $comments = [
              '--' => true,
              '/*' => true,
          ];
  
          $length = 2;
          if (!isset($comments[$this->substring($length)])) {
              return false;
          }
  
          if ($this->substring($length) === '--') {
              $length = $this->indexAfter("\n") - $this->offset;
          } else {
              $length = $this->indexAfter('*/') - $this->offset;
          }
  
          return true;
      }
docs: {@inheritdoc}