Translation iterator

gistfile1.txt

scalac transiter.scala
scala TranslationIterator input.txt > output.txt

input.txt

^test/test<n><sg>/test<vblex><pri><p3><sg>$ ^file/file<n><sg>/file<vblex><pri><p3><sg>$
^test/test<n><sg>/test<vblex><pri><p3><sg>$ ^file/file<n><sg>/file<vblex><pri><p3><sg>$ ^test/test<n><sg>/test<vblex><pri><p3><sg>$

output.txt

[1.0]^test<n><sg>$ ^file<n><sg>$
[1.1]^test<n><sg>$ ^file<vblex><pri><p3><sg>$
[1.2]^test<vblex><pri><p3><sg>$ ^file<n><sg>$
[1.3]^test<vblex><pri><p3><sg>$ ^file<vblex><pri><p3><sg>$
[2.0]^test<n><sg>$ ^file<n><sg>$ ^test<n><sg>$
[2.1]^test<n><sg>$ ^file<n><sg>$ ^test<vblex><pri><p3><sg>$
[2.2]^test<n><sg>$ ^file<vblex><pri><p3><sg>$ ^test<n><sg>$
[2.3]^test<n><sg>$ ^file<vblex><pri><p3><sg>$ ^test<vblex><pri><p3><sg>$
[2.4]^test<vblex><pri><p3><sg>$ ^file<n><sg>$ ^test<n><sg>$
[2.5]^test<vblex><pri><p3><sg>$ ^file<n><sg>$ ^test<vblex><pri><p3><sg>$
[2.6]^test<vblex><pri><p3><sg>$ ^file<vblex><pri><p3><sg>$ ^test<n><sg>$
[2.7]^test<vblex><pri><p3><sg>$ ^file<vblex><pri><p3><sg>$ ^test<vblex><pri><p3><sg>$

transiter.scala

object TranslationIterator {
  def wrap(s: String): String = "^" + s + "$"

  def cart(l: List[List[String]]): List[List[String]] = l match {
    case Nil => List(Nil)
    case h :: t => for(e <- h; rest <- cart(t)) yield e :: rest
  }

  def splitter(s: String) = s.split("\\/").toList.filter{_.contains("<") }

  def main(args: Array[String]) {
    val lines = io.Source.fromFile(args(0)).getLines.toList
    var counter = 1
    for(line <- lines) {
      val words = line.split("\\$|\\^").filter{ _ contains("/") }
      val list = words.toList.map{splitter}
      val joined = cart(list)
      for ((e, n) <- joined.zipWithIndex) {
        println("[" + counter + "." + n + "]" + e.map{wrap}.mkString(" "))
      }
      counter += 1
    }
  }
}