splitIterator.scala

  object Multiline {
    def splitOn[T](iterator: Iterator[T])(split: T => Boolean): Iterator[Seq[T]] = {
      new Iterator[Seq[T]] {
        var nextFrame: Seq[T] = Vector.empty

        override def hasNext: Boolean = nextFrame.nonEmpty || iterator.hasNext

        override def next(): Seq[T] = {
          while (iterator.hasNext) {
            val t = iterator.next()
            if (nextFrame.isEmpty) {
              nextFrame = nextFrame :+ t
            } else {
              if (split(t)) {
                val res = nextFrame
                nextFrame = Vector(t)
                return res
              } else {
                nextFrame = nextFrame :+ t
              }
            }
          }
          val res = nextFrame
          nextFrame = Vector()
          res
        }
      }
    }
  }