Experiments in fastparse

gistfile1.scala

object ParseGist extends App {

  import fastparse._

  val space = P(CharsWhile(" \n".contains(_)).?)
  val digits = P(CharsWhile('0' to '9' contains _))
  val exponent = P(CharIn("eE") ~ CharIn("+-").? ~ digits)
  val fractional = P("." ~ digits)
  val integral = P("0" | CharIn('1' to '9') ~ digits.?)

  val integer = space ~ P(CharIn("+-").? ~ integral).!.map(_.toInt)
  val double = space ~ P(CharIn("+-").? ~ integral ~ fractional.? ~ exponent.?).!.map(_.toDouble)

  //why do I get this type?
  val p4Header:Parser[((Int, Int, Int, Double, Double, Int, Int, Double, Double), Double, Int, Int)] =
    P(integer ~ integer ~ integer ~ double ~ double ~ integer ~ integer ~ double ~ double ~ double ~ integer ~ integer)

  val res = p4Header.parse( """2 27 0 3.000000 3.000000 1 3 0.080000 0.000000 0.000000 0 1002""")
  println(res)
}