code: public function generatePartialCode($start, $end)
      {
          $code = '';
  
          for ($i = $start; $i <= $end; ++$i) {
              $code .= $this[$i]->getContent();
          }
  
          return $code;
      }
docs: Generate code from tokens between given indexes.
  
  @param int $start start index
  @param int $end   end index
  
  @return string