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Created June 2, 2016 06:24
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object InterpretOpt extends (Instruction ~> Option) {
import Computations._
val nonNegative: (Position) => Option[Position] = {
p => if (p.x >= 0 &&p.y >= 0) Some(p) else None
override def apply[A](fa: Instruction[A]) = fa match {
case Forward(p, length) => nonNegative(forward(p, length))
case Backward(p, length) => nonNegative(backward(p, length))
case RotateLeft(p, degree) => Some(left(p, degree))
case RotateRight(p, degree) => Some(right(p, degree))
case ShowPosition(p) => Some(println(s"showing position $p"))
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