package millfork.parser
import millfork.error.ErrorReporting
import millfork.node.Position

/**
  * @author Karol Stasiak
  */
class TextCodec(val name:String, private val map: String, private val extra: Map[Char,Int]) {
  def decode(position: Option[Position], c: Char): Int = {
    if (extra.contains(c)) extra(c) else {
      val index = map.indexOf(c)
      if (index >= 0) {
        index
      } else {
        ErrorReporting.fatal("Invalid character in string in ")
      }
    }
  }
}

object TextCodec {
  val NotAChar = '\ufffd'

  val Ascii = new TextCodec("ASCII", 0.until(127).map{i => if (i<32) NotAChar else i.toChar}.mkString, Map.empty)

  val Petscii = new TextCodec("PETSCII",
    "\ufffd" * 32 + 0x20.to(0x3f).map(_.toChar).mkString + "@abcdefghijklmnopqrstuvwxyz[£]↑←–ABCDEFGHIJKLMNOPQRSTUVWXYZ",
    Map('^' -> 0x5E, 'π' -> 0x7E)
  )


}