// Main Part 5 about a "Compiler" for the Brainf*** language

//============================================================

object M5b {

// !!! Copy any function you need from file bf.scala !!!

//

// If you need any auxiliary function, feel free to 

// implement it, but do not make any changes to the

// templates below.

// DEBUGGING INFORMATION FOR COMPILERS!!!

//

// Compiler, even real ones, are fiendishly difficult to get

// to produce correct code. One way to debug them is to run

// example programs ``unoptimised''; and then optimised. Does

// the optimised version still produce the same result?

// for timing purposes

def time_needed[T](n: Int, code: => T) = {

  val start = System.nanoTime()

  for (i <- 0 until n) code

  val end = System.nanoTime()

  (end - start)/(n * 1.0e9)

}

type Mem = Map[Int, Int]

import io.Source

import scala.util._

// ADD YOUR CODE BELOW

//======================

// (6) 

def jtable(pg: String) : Map[Int, Int] = ???

// testcase

//

// jtable("""+++++[->++++++++++<]>--<+++[->>++++++++++<<]>>++<<----------[+>.>.<+<]""")

// =>  Map(69 -> 61, 5 -> 20, 60 -> 70, 27 -> 44, 43 -> 28, 19 -> 6)

def compute2(pg: String, tb: Map[Int, Int], pc: Int, mp: Int, mem: Mem) : Mem = ???

def run2(pg: String, m: Mem = Map()) = ???

// testcases

// time_needed(1, run2(load_bff("benchmark.bf")))

// time_needed(1, run2(load_bff("sierpinski.bf")))

// (7) 

def optimise(s: String) : String = ???

def compute3(pg: String, tb: Map[Int, Int], pc: Int, mp: Int, mem: Mem) : Mem = ???

def run3(pg: String, m: Mem = Map()) = ???

// testcases

//

// optimise(load_bff("benchmark.bf"))          // should have inserted 0's

// optimise(load_bff("mandelbrot.bf")).length  // => 11205

// 

// time_needed(1, run3(load_bff("benchmark.bf")))

// (8)  

def combine(s: String) : String = ???

// testcase

// combine(load_bff("benchmark.bf"))

def compute4(pg: String, tb: Map[Int, Int], pc: Int, mp: Int, mem: Mem) : Mem = ???

// should call first optimise and then combine on the input string

//

def run4(pg: String, m: Mem = Map()) = ???

// testcases

// combine(optimise(load_bff("benchmark.bf"))) // => """>A+B[<A+M>A-A]<A[[....."""

// testcases (they should now run much faster)

// time_needed(1, run4(load_bff("benchmark.bf")))

// time_needed(1, run4(load_bff("sierpinski.bf"))) 

// time_needed(1, run4(load_bff("mandelbrot.bf")))

}