// 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  // => 11203
// 
// 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")))


}