Scalculate in scala

Exercice2.scala

package fr.ybo.battle


object Exercice2 {

  def specificSepRegExp = "\\[([^\\[\\]]+)]".r

  def defaultSep = Seq("\n", ",")

  def add(valeur:String):Int = {

    if (valeur.isEmpty) {
      return 0
    }

    var seps:Seq[String] = Seq.empty

    var myValue = valeur

    if (valeur.startsWith("//")) {
      seps = defaultSep

      specificSepRegExp.findAllIn(valeur.split("\n").apply(0)).map(oneSep => {
        oneSep.substring(1, oneSep.length - 1)
      }).foreach(seps :+= _)

      myValue = valeur.split("\n").filter(!_.startsWith("//")).mkString("\n")
    } else {
      seps = defaultSep
    }

    var regexpSep = ""
    seps.foreach( sep => {
      if (regexpSep.length > 0) {
        regexpSep += "|"
      }
      regexpSep = regexpSep + "(" + sep.flatMap("\\" + _) + ")"
    })

    try {
      myValue.split(regexpSep).map(_.toInt).sum
    } catch {
      case ignore:NumberFormatException => 9999
    }
  }


  def main(args: Array[String]) {
    assert(add("") == 0)
    assert(add("10") == 10)
    assert(add("10,2") == 12)
    assert(add("10,-20,1") == -9)
    assert(add("1,aa") == 9999)
    assert(add("1\n10,2") == 13)
    assert(add("//[;]\n1;2") == 3)
    assert(add("//[;]\n1;1002") == 1003)
    assert(add("//[;][%]\n1;2%1;2") == 6)
    assert(add("//[;][%%][.]\n1;2\n1%%2,-1.4.9.5%%1001,1") == 1025)
  }

}