sbt second segment

second.scala

// sbt definition of version
// https://github.com/sbt/sbt/blob/0.13/ivy/src/main/scala/sbt/VersionNumber.scala#L3
case class SecondSegment(
  numbers: List[Long],
  tags: List[String],
  extras: List[String]
) extends Version

  // https://github.com/sbt/sbt/blob/0.13/ivy/src/main/scala/sbt/VersionNumber.scala#L40
  private val SecondSegmentParser = {
    val Numbers = (Number ~ ("." ~ Number).rep).map{ case (h, t) => h :: t.toList}
    val Tags    = ("-" ~ AnyChar.rep.!).rep.map(_.toList)
    val Extras  = ("+" ~ AnyChar.rep.!).rep.map(_.toList)
    (Numbers ~ Tags ~ Extras).map(
      (SecondSegment.apply _).tupled
    )
  }
  def parse(v: String): Version = {
    (Start ~ SemanticVersioningParser ~ End).parse(v) match {
      case Parsed.Success(vp, _) => vp
      case _ => (Start ~ SecondSegmentParser ~ End).parse(v) match {
        case Parsed.Success(vp, _) => vp
        case _ => InvalidVersion(v)
      }
    }
  }