code: private function findWhitespaceIndexAfterParenthesis(Tokens $tokens, $startParenthesisIndex, $endParenthesisIndex)
      {
          $direction = $endParenthesisIndex > $startParenthesisIndex ? 1 : -1;
          $startIndex = $startParenthesisIndex + $direction;
          $endIndex = $endParenthesisIndex - $direction;
  
          for ($index = $startIndex; $index !== $endIndex; $index += $direction) {
              $token = $tokens[$index];
  
              if ($token->isWhitespace()) {
                  return $index;
              }
  
              if (!$token->isComment()) {
                  break;
              }
          }
  
          return null;
      }
docs: @param Tokens $tokens
  @param int    $startParenthesisIndex
  @param int    $endParenthesisIndex
  
  @return null|int