Iteratee.scala

def countTokenized: Iteratee[String, List[Int]] = {
    def step(restCount: Int, resultList: List[Int])(i: Input[String]): Iteratee[String, List[Int]] = i match {
      case Input.Empty =>
        Done(Nil, Input.Empty)
      case Input.EOF   => {
        (restCount, resultList) match {
          case (0, Nil)           => Done(Nil, Input.EOF)
          case (0, resList)       => Done(resList, Input.EOF)
          case (rCount, Nil)      => Done(List(rCount), Input.EOF)
          case (rCount, resList)  => Done(resultList ::: List(restCount), Input.EOF)
        }
      }
      case Input.El(e)  =>
        if(e.contains(",")) { // there are "," in that chunk
        val lengthList = e.split(",", -1).toList.map(_.length)
          val newResultList = lengthList.dropRight(1).updated(0, restCount + lengthList.head)
          val newRestCount = lengthList.last
          Cont[String, List[Int]](i => step(newRestCount, resultList ::: newResultList)(i))
        } else {  // chunk without ","
          Cont[String, List[Int]](i => step(e.length + restCount, resultList)(i)) // pass e.length to next step
        }
    }
    Cont[String, List[Int]](i => step(0, Nil)(i))
  }