# HG changeset patch # User Christian Urban # Date 1544122586 0 # Node ID c989f50da5de85cf1aa7a242cc90da4386802d73 # Parent c51305a2217f91035b99b2f91c4a55c227c43c9c updated diff -r c51305a2217f -r c989f50da5de testing5/benchmark.bf --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/testing5/benchmark.bf Thu Dec 06 18:56:26 2018 +0000 @@ -0,0 +1,4 @@ +>++[<+++++++++++++>-]<[[>+>+<<-]>[<+>-]++++++++ +[>++++++++<-]>.[-]<<>++++++++++[>++++++++++[>++ +++++++++[>++++++++++[>++++++++++[>++++++++++[>+ ++++++++++[-]<-]<-]<-]<-]<-]<-]<-]++++++++++. \ No newline at end of file diff -r c51305a2217f -r c989f50da5de testing5/bf.scala --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/testing5/bf.scala Thu Dec 06 18:56:26 2018 +0000 @@ -0,0 +1,225 @@ +// Part 1 about an Interpreter for the Brainf*** language +//======================================================== + +object CW10a { // only for generating the Jar file + + +type Mem = Map[Int, Int] + + +import io.Source +import scala.util._ + +// (1) Write a function that takes a file name as argument and +// and requests the corresponding file from disk. It returns the +// content of the file as a String. If the file does not exists, +// the function should return the empty string. + +def load_bff(name: String) : String = + Try(Source.fromFile(name)("ISO-8859-1").mkString).getOrElse("") + + +// (2) Complete the functions for safely reading +// and writing brainf*** memory. Safely read should +// Return the value stored in the Map for a given memory +// pointer, provided it exists; otherwise it Returns 0. The +// writing function generates a new Map with the +// same data, except at the given memory pointer the +// value v is stored. + + +def sread(mem: Mem, mp: Int) : Int = + mem.getOrElse(mp, 0) + +def write(mem: Mem, mp: Int, v: Int) : Mem = + mem.updated(mp, v) + + +// (3) Implement the two jumping instructions in the +// brainf*** language. In jumpRight, given a program and +// a program counter move the program counter to the right +// until after the *matching* ]-command. Similarly, +// jumpLeft implements the move to the left to just after +// the *matching* [-command. + +def jumpRight(prog: String, pc: Int, level: Int) : Int = { + if (prog.length <= pc) pc + else (prog(pc), level) match { + case (']', 0) => pc + 1 + case (']', l) => jumpRight(prog, pc + 1, l - 1) + case ('[', l) => jumpRight(prog, pc + 1, l + 1) + case (_, l) => jumpRight(prog, pc + 1, l) + } +} + +def jumpLeft(prog: String, pc: Int, level: Int) : Int = { + if (pc < 0) pc + else (prog(pc), level) match { + case ('[', 0) => pc + 1 + case ('[', l) => jumpLeft(prog, pc - 1, l - 1) + case (']', l) => jumpLeft(prog, pc - 1, l + 1) + case (_, l) => jumpLeft(prog, pc - 1, l) + } +} + +// test cases +//jumpRight("""--[..+>--],>,++""", 3, 0) // => 10 +//jumpLeft("""--[..+>--],>,++""", 8, 0) // => 3 +//jumpRight("""--[..[+>]--],>,++""", 3, 0) // => 12 +//jumpRight("""--[..[[-]+>[.]]--],>,++""", 3, 0) // => 18 +//jumpRight("""--[..[[-]+>[.]]--,>,++""", 3, 0) // => 22 (outside) +//jumpLeft("""[******]***""", 7, 0) // => -1 (outside) + +// (4) Complete the compute function that interprets (runs) a brainf*** +// program: the arguments are a program (represented as a string), a program +// counter, a memory counter and a brainf*** memory. It Returns the +// memory at the stage when the execution of the brainf*** program +// finishes. The interpretation finishes once the program counter +// pc is pointing to something outside the program string. +// If the pc points to a character inside the program, the pc, +// memory pointer and memory need to be updated according to +// rules of the brainf*** language. Then, recursively, the compute +// function continues with the command at the new program +// counter. +// Implement the run function that calls compute with the program +// counter and memory counter set to 0. + +def compute(prog: String, pc: Int, mp: Int, mem: Mem) : Mem = { + if (0 <= pc && pc < prog.length) { + val (new_pc, new_mp, new_mem) = prog(pc) match { + case '>' => (pc + 1, mp + 1, mem) + case '<' => (pc + 1, mp - 1, mem) + case '+' => (pc + 1, mp, write(mem, mp, sread(mem, mp) + 1)) + case '-' => (pc + 1, mp, write(mem, mp, sread(mem, mp) - 1)) + case '.' => { print(sread(mem, mp).toChar); (pc + 1, mp, mem) } + case ',' => (pc + 1, mp, write(mem, mp, Console.in.read().toByte)) + case '[' => + if (sread(mem, mp) == 0) (jumpRight(prog, pc + 1, 0), mp, mem) else (pc + 1, mp, mem) + case ']' => + if (sread(mem, mp) != 0) (jumpLeft(prog, pc - 1, 0), mp, mem) else (pc + 1, mp, mem) + case _ => (pc + 1, mp, mem) + } + compute(prog, new_pc, new_mp, new_mem) + } + else mem +} + +def run(prog: String, m: Mem = Map()) = compute(prog, 0, 0, m) + + +/* + +// some sample bf-programs collected from the Internet +//===================================================== + + +// first some contrived (small) programs + +// clears the 0-cell +run("[-]", Map(0 -> 100)) // Map will be 0 -> 0 + +// copies content of the 0-cell to 1-cell +run("[->+<]", Map(0 -> 10)) // Map will be 0 -> 0, 1 -> 10 + + +// copies content of the 0-cell to 2-cell and 4-cell +run("[>>+>>+<<<<-]", Map(0 -> 42)) + + +// prints out numbers 0 to 9 +run("""+++++[->++++++++++<]>--<+++[->>++++++++++<<]>>++<<----------[+>.>.<+<]""") + + +// some more "useful" programs + +// hello world program 1 +run("""++++++++[>++++[>++>+++>+++>+<<<<-]>+>+>->>+[<]<-]>>.>---.+++++++ + ..+++.>>.<-.<.+++.------.--------.>>+.>++.""") + +// hello world program 2 +run("""++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>+ + +.<<+++++++++++++++.>.+++.------.--------.>+.>.""") + + +// draws the Sierpinski triangle +run("""++++++++[>+>++++<<-]>++>>+<[-[>>+<<-]+>>]>+[-<<<[ + ->[+[-]+>++>>>-<<]<[<]>>++++++[<<+++++>>-]+<<++.[-]<< + ]>.>+[>>]>+]""") + +run(load_bff("sierpinski.bf")) + + +//fibonacci numbers below 100 +run("""+++++++++++ + >+>>>>++++++++++++++++++++++++++++++++++++++++++++ + >++++++++++++++++++++++++++++++++<<<<<<[>[>>>>>>+> + +<<<<<<<-]>>>>>>>[<<<<<<<+>>>>>>>-]<[>++++++++++[- + <-[>>+>+<<<-]>>>[<<<+>>>-]+<[>[-]<[-]]>[<<[>>>+<<< + -]>>[-]]<<]>>>[>>+>+<<<-]>>>[<<<+>>>-]+<[>[-]<[-]] + >[<<+>>[-]]<<<<<<<]>>>>>[+++++++++++++++++++++++++ + +++++++++++++++++++++++.[-]]++++++++++<[->-<]>++++ + ++++++++++++++++++++++++++++++++++++++++++++.[-]<< + <<<<<<<<<<[>>>+>+<<<<-]>>>>[<<<<+>>>>-]<-[>>.>.<<< + [-]]<<[>>+>+<<<-]>>>[<<<+>>>-]<<[<+>-]>[<+>-]<<<-]""") + + +//outputs the square numbers up to 10000 +run("""++++[>+++++<-]>[<+++++>-]+<+[ + >[>+>+<<-]++>>[<<+>>-]>>>[-]++>[-]+ + >>>+[[-]++++++>>>]<<<[[<++++++++<++>>-]+<.<[>----<-]<] + <<[>>>>>[>>>[-]+++++++++<[>-<-]+++++++++>[-[<->-]+[<<<]]<[>+<-]>]<<-]<<-]""") + +//collatz numbers (needs a number to be typed in) +run(""">,[[----------[ + >>>[>>>>]+[[-]+<[->>>>++>>>>+[>>>>]++[->+<<<<<]]<<<] + ++++++[>------<-]>--[>>[->>>>]+>+[<<<<]>-],<]>]>>>++>+>>[ + <<[>>>>[-]+++++++++<[>-<-]+++++++++>[-[<->-]+[<<<<]]<[>+<-]>] + >[>[>>>>]+[[-]<[+[->>>>]>+<]>[<+>[<<<<]]+<<<<]>>>[->>>>]+>+[<<<<]] + >[[>+>>[<<<<+>>>>-]>]<<<<[-]>[-<<<<]]>>>>>>> + ]>>+[[-]++++++>>>>]<<<<[[<++++++++>-]<.[-]<[-]<[-]<]<,]""") + + +// infinite collatz (never stops) +run(""">>+>+<[[->>[>>]>>>[>>]+[<<]<<<[<<]>[>[>>]>>+>[>>]<+<[<<]<<<[< + <]>-]>[>>]>>[<<<<[<<]>+>[>>]>>-]<<<<[<<]+>>]<<[+++++[>+++++++ + +<-]>.<++++++[>--------<-]+<<]>>[>>]+[>>>>[<<+>+>-]<-[>+<-]+< + [<<->>-[<<+>>[-]]]>>>[<<<+<<+>>>>>-]<<<[>>>+<<<-]<<[[-]>+>>-> + [<+<[<<+>>-]<[>+<-]<[>+<-]>>>>-]<[>+<-]+<[->[>>]<<[->[<+++>-[ + <+++>-[<+++>-[<[-]++>>[-]+>+<<-[<+++>-[<+++>-[<[-]+>>>+<<-[<+ + ++>-[<+++>-]]]]]]]]]<[>+<-]+<<]>>>+<[->[<+>-[<+>-[<+>-[<+>-[< + +>-[<+>-[<+>-[<+>-[<+>-[<[-]>>[-]+>+<<-[<+>-]]]]]]]]]]]<[>+<- + ]+>>]<<[<<]>]<[->>[->+>]<[-[<+>-[<->>+<-[<+>-[<->>+<-[<+>-[<- + >>+<-[<+>-[<->>+<-[<+>-[<->>+<-[<+>-[<->>+<-[<+>-[<->>+<-[<+> + -[<->>+<-[<+>-[<->>+<-[<+>-]]]]]]]]]]]]]]]]]]]>[<+>-]<+<[<+++ + +++++++>-]<]>>[<+>->>]<<[>+>+<<-]>[<+>-]+>[<->[-]]<[-<<-]<<[< + <]]++++++[>+++++++<-]>++.------------.[-]>[>>]<<[+++++[>+++++ + +++<-]>.<++++++[>--------<-]+<<]+<]>[<+>-]<]>>>[>>]<<[>[-]<-< + <]++++++++++.[-]<<<[<<]>>>+<[->[<+>-[<+>-[<+>-[<+>-[<+>-[<+>- + [<+>-[<+>-[<+>-[<[-]>>[-]+>+<<-]]]]]]]]]]<[>+<-]+>>]<<[<<]>>]""") + + + +// a Mandelbrot set generator in brainf*** written by Erik Bosman +// (http://esoteric.sange.fi/brainfuck/utils/mandelbrot/) + +run(load_bff("mandelbrot.bf")) + + +// a benchmark program (counts down from 'Z' to 'A') +val b1 = """>++[<+++++++++++++>-]<[[>+>+<<-]>[<+>-]++++++++ + [>++++++++<-]>.[-]<<>++++++++++[>++++++++++[>++ + ++++++++[>++++++++++[>++++++++++[>++++++++++[>+ + +++++++++[-]<-]<-]<-]<-]<-]<-]<-]++++++++++.""" + + +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) +} + +time_needed(1, run(b1)) +*/ + +} diff -r c51305a2217f -r c989f50da5de testing5/bf1a_test.scala --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/testing5/bf1a_test.scala Thu Dec 06 18:56:26 2018 +0000 @@ -0,0 +1,17 @@ + +//import scala.concurrent._ +//import scala.concurrent.duration._ +//import ExecutionContext.Implicits.global +//import scala.language.postfixOps +//import scala.language.reflectiveCalls + +//lazy val f = Future { + import CW8b._ + + assert(sread(Map(), 2) == 0) + assert(sread(Map(2 -> 1), 2) == 1) + assert(write(Map(), 1, 2) == Map(1 -> 2)) + assert(write(Map(1 -> 0), 1, 2) == Map(1 -> 2)) +//} + +//Await.result(f, 120 second) diff -r c51305a2217f -r c989f50da5de testing5/bf1b_test.scala --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/testing5/bf1b_test.scala Thu Dec 06 18:56:26 2018 +0000 @@ -0,0 +1,21 @@ + +//import scala.concurrent._ +//import scala.concurrent.duration._ +//import ExecutionContext.Implicits.global +//import scala.language.postfixOps +//import scala.language.reflectiveCalls + +//lazy val f = Future { + import CW8b._ + + assert(jumpRight("[******]***", 1, 0) == 8) + assert(jumpRight("[**[*]*]***", 1, 0) == 8) + assert(jumpRight("[**[*]*]***", 1, 0) == 8) + assert(jumpRight("[**[***]***", 1, 0) == 11) + assert(jumpRight("[*[][]*]***", 1, 0) == 8) + assert(jumpLeft("[******]***", 6, 0) == 1) + assert(jumpLeft("[******]***", 7, 0) == -1) + assert(jumpLeft("[*[][]*]***", 6, 0) == 1) +//} + +//Await.result(f, 120 second) diff -r c51305a2217f -r c989f50da5de testing5/bf1c_test.scala --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/testing5/bf1c_test.scala Thu Dec 06 18:56:26 2018 +0000 @@ -0,0 +1,19 @@ + +//import scala.concurrent._ +//import scala.concurrent.duration._ +//import ExecutionContext.Implicits.global +//import scala.language.postfixOps +//import scala.language.reflectiveCalls + +//lazy val f = Future { + import CW8b._ + + assert(start("[-]", Map(0 -> 100)) == Map(0 -> 0)) + assert(start("[->+<]", Map(0 -> 10)) == Map(0 -> 0, 1 -> 10)) + assert(start("[>>+>>+<<<<-]", Map(0 -> 42)) == Map(0 -> 0, 2 -> 42, 4 -> 42)) + assert(start("""++++++++[>++++[>++>+++>+++>+<<<<-]>+>+>->>+[<] + <-]>>.>---.+++++++..+++.>>.<-.<.+++.------.--------.>>+.>++.""", Map()) == Map(0 -> 0, 5 -> 33, 1 -> 0, 6 -> 10, 2 -> 72, 3 -> 100, 4 -> 87)) + +//} + +//Await.result(f, 120 second) diff -r c51305a2217f -r c989f50da5de testing5/bf_test.sh --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/testing5/bf_test.sh Thu Dec 06 18:56:26 2018 +0000 @@ -0,0 +1,120 @@ +#!/bin/bash +set -e + +out=${1:-output} + +echo "" > $out + +echo "Below is the feedback for your submission of CW 8, Part 2." >> $out +echo "" >> $out + + +# compilation tests + +function scala_compile { + (ulimit -t 30 -m 1024000 ; scala "$1" 2>> $out 1>> $out) +} + +# functional tests + +function scala_assert { + (ulimit -t 30 -m 1024000 ; scala -i "$1" "$2" -e "" 2> /dev/null 1> /dev/null) +} + +# purity test + +function scala_vars { + (egrep '\bvar\b|\breturn\b|\.par|ListBuffer|mutable|new Array' "$1" 2> /dev/null 1> /dev/null) +} + + +# var, return, ListBuffer test +# +echo "bf.scala does not contain vars, returns etc?" >> $out + +if (scala_vars bf.scala) +then + echo " --> fail" >> $out + tsts0=$(( 1 )) +else + echo " --> success" >> $out + tsts0=$(( 0 )) +fi + + +# compilation test +if [ $tsts0 -eq 0 ] +then + echo "bf.scala runs?" >> $out + + if (scala_compile bf.scala) + then + echo " --> success" >> $out + tsts1=$(( 0 )) + else + echo " --> scala bf.scala did not run successfully" >> $out + tsts1=$(( 1 )) + fi +else + tsts1=$(( 1 )) +fi + + + +if [ $tsts1 -eq 0 ] +then + echo " sread(Map(), 2) == 0" >> $out + echo " sread(Map(2 -> 1), 2) == 1" >> $out + echo " write(Map(), 1, 2) == Map(1 -> 2)" >> $out + echo " write(Map(1 -> 0), 1, 2) == Map(1 -> 2)" >> $out + + if (scala_assert "bf.scala" "bf1a_test.scala") + then + echo " --> success" >> $out + else + echo " --> test failed" >> $out + fi +fi + + + +if [ $tsts1 -eq 0 ] +then + echo " jumpRight(\"[******]***\", 1, 0) == 8" >> $out + echo " jumpRight(\"[**[*]*]***\", 1, 0) == 8" >> $out + echo " jumpRight(\"[**[*]*]***\", 1, 0) == 8" >> $out + echo " jumpRight(\"[**[***]***\", 1, 0) == 11" >> $out + echo " jumpRight(\"[*[][]*]***\", 1, 0) == 8" >> $out + echo " jumpLeft(\"[******]***\", 6, 0) == 1" >> $out + echo " jumpLeft(\"[******]***\", 7, 0) == -1" >> $out + echo " jumpLeft(\"[*[][]*]***\", 6, 0) == 1" >> $out + + if (scala_assert "bf.scala" "bf1b_test.scala") + then + echo " --> success" >> $out + else + echo " --> test failed" >> $out + fi +fi + + + +if [ $tsts1 -eq 0 ] +then + echo " start(\"[-]\", Map(0 -> 100)) == Map(0 -> 0)" >> $out + echo " start(\"[->+<]\", Map(0 -> 10)) == Map(0 -> 0, 1 -> 10)" >> $out + echo " start(\"[>>+>>+<<<<-]\", Map(0 -> 42)) == Map(0 -> 0, 2 -> 42, 4 -> 42)" >> $out + echo " start({{hello world prg 1}}, Map()) == " >> $out + echo " Map(0 -> 0, 5 -> 33, 1 -> 0, 6 -> 10, 2 -> 72, 3 -> 100, 4 -> 87)" >> $out + + if (scala_assert "bf.scala" "bf1c_test.scala") + then + echo " --> success" >> $out + else + echo " --> test failed" >> $out + fi +fi + + + + diff -r c51305a2217f -r c989f50da5de testing5/bfc.scala --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/testing5/bfc.scala Thu Dec 06 18:56:26 2018 +0000 @@ -0,0 +1,309 @@ +// Part 2 about a "Compiler" for the Brainf*** language +//====================================================== + +object CW10b { + +// !!! 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. + + +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._ + +def load_bff(name: String) : String = + Try(Source.fromFile(name)("ISO-8859-1").mkString).getOrElse("") + +def sread(mem: Mem, mp: Int) : Int = + mem.getOrElse(mp, 0) + +def write(mem: Mem, mp: Int, v: Int) : Mem = + mem.updated(mp, v) + +def jumpRight(prog: String, pc: Int, level: Int) : Int = { + if (prog.length <= pc) pc + else (prog(pc), level) match { + case (']', 0) => pc + 1 + case (']', l) => jumpRight(prog, pc + 1, l - 1) + case ('[', l) => jumpRight(prog, pc + 1, l + 1) + case (_, l) => jumpRight(prog, pc + 1, l) + } +} + +def jumpLeft(prog: String, pc: Int, level: Int) : Int = { + if (pc < 0) pc + else (prog(pc), level) match { + case ('[', 0) => pc + 1 + case ('[', l) => jumpLeft(prog, pc - 1, l - 1) + case (']', l) => jumpLeft(prog, pc - 1, l + 1) + case (_, l) => jumpLeft(prog, pc - 1, l) + } +} + +def compute(prog: String, pc: Int, mp: Int, mem: Mem) : Mem = { + if (0 <= pc && pc < prog.length) { + val (new_pc, new_mp, new_mem) = prog(pc) match { + case '>' => (pc + 1, mp + 1, mem) + case '<' => (pc + 1, mp - 1, mem) + case '+' => (pc + 1, mp, write(mem, mp, sread(mem, mp) + 1)) + case '-' => (pc + 1, mp, write(mem, mp, sread(mem, mp) - 1)) + case '.' => { print(sread(mem, mp).toChar); (pc + 1, mp, mem) } + case ',' => (pc + 1, mp, write(mem, mp, Console.in.read().toByte)) + case '[' => + if (sread(mem, mp) == 0) (jumpRight(prog, pc + 1, 0), mp, mem) else (pc + 1, mp, mem) + case ']' => + if (sread(mem, mp) != 0) (jumpLeft(prog, pc - 1, 0), mp, mem) else (pc + 1, mp, mem) + case _ => (pc + 1, mp, mem) + } + compute(prog, new_pc, new_mp, new_mem) + } + else mem +} + +def run(prog: String, m: Mem = Map()) = compute(prog, 0, 0, m) + + +// The baseline to what we can compare our "compiler" +// implemented below. It should require something like +// 60 seconds for the calculation on my laptop +// +//time_needed(1, run(load_bff("benchmark.bf"))) + + + +// DEBUGGING INFORMATION!!! +// +// Compiler, even real ones, are fiedishly difficult to get +// to prduce correct code. The point is that for example for +// the sierpinski program, they need to still generate code +// that displays such a triangle. If yes, then one usually +// can take comfort that all is well. If not, then something +// went wrong during the optimisations. + + + +// (5) Write a function jtable that precomputes the "jump +// table" for a bf-program. This function takes a bf-program +// as an argument and Returns a Map[Int, Int]. The +// purpose of this map is to record the information +// that given on the position pc is a '[' or a ']', +// then to which pc-position do we need to jump next? +// +// For example for the program +// +// "+++++[->++++++++++<]>--<+++[->>++++++++++<<]>>++<<----------[+>.>.<+<]" +// +// we obtain the map +// +// Map(69 -> 61, 5 -> 20, 60 -> 70, 27 -> 44, 43 -> 28, 19 -> 6) +// +// This states that for the '[' on position 5, we need to +// jump to position 20, which is just after the corresponding ']'. +// Similarly, for the ']' on position 19, we need to jump to +// position 6, which is just after the '[' on position 5, and so +// on. The idea is to not calculate this information each time +// we hit a bracket, but just look up this information in the +// jtable. You can use the jumpLeft and jumpRight functions +// from Part 1 for calculating the jtable. +// +// Then adapt the compute and run functions from Part 1 in order +// to take advantage of the information stored in the jtable. +// This means whenever jumpLeft and jumpRight was called previously, +// you should look up the jump address in the jtable. + + +def jtable(pg: String) : Map[Int, Int] = + (0 until pg.length).collect { pc => pg(pc) match { + case '[' => (pc -> jumpRight(pg, pc + 1, 0)) + case ']' => (pc -> jumpLeft(pg, pc - 1, 0)) + }}.toMap + + +// 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 = { + if (0 <= pc && pc < pg.length) { + val (new_pc, new_mp, new_mem) = pg(pc) match { + case '>' => (pc + 1, mp + 1, mem) + case '<' => (pc + 1, mp - 1, mem) + case '+' => (pc + 1, mp, write(mem, mp, sread(mem, mp) + 1)) + case '-' => (pc + 1, mp, write(mem, mp, sread(mem, mp) - 1)) + case '.' => { print(sread(mem, mp).toChar); (pc + 1, mp, mem) } + case ',' => (pc + 1, mp, write(mem, mp, Console.in.read().toByte)) + case '[' => + if (sread(mem, mp) == 0) (tb(pc), mp, mem) else (pc + 1, mp, mem) + case ']' => + if (sread(mem, mp) != 0) (tb(pc), mp, mem) else (pc + 1, mp, mem) + case _ => (pc + 1, mp, mem) + } + compute2(pg, tb, new_pc, new_mp, new_mem) + } + else mem +} + + +def run2(pg: String, m: Mem = Map()) = + compute2(pg, jtable(pg), 0, 0, m) + +//time_needed(1, run2(load_bff("benchmark.bf"))) + + + +// (6) Write a function optimise which deletes "dead code" (everything +// that is not a bf-command) and also replaces substrings of the form +// [-] by a new command 0. The idea is that the loop [-] just resets the +// memory at the current location to 0. In the compute3 and run3 functions +// below you implement this command by writing the number 0 to mem(mp), +// that is write(mem, mp, 0). +// +// The easiest way to modify a string in this way is to use the regular +// expression """[^<>+-.,\[\]]""", which recognises everything that is +// not a bf-command and replace it by the empty string. Similarly the +// regular expression """\[-\]""" finds all occurences of [-] and +// by using the Scala method .replaceAll you can repplace it with the +// string "0" standing for the new bf-command. + +def optimise(s: String) : String = + s.replaceAll("""[^<>+-.,\[\]]""","").replaceAll("""\[-\]""", "0") + + +def compute3(pg: String, tb: Map[Int, Int], pc: Int, mp: Int, mem: Mem) : Mem = { + if (0 <= pc && pc < pg.length) { + val (new_pc, new_mp, new_mem) = pg(pc) match { + case '0' => (pc + 1, mp, write(mem, mp, 0)) + case '>' => (pc + 1, mp + 1, mem) + case '<' => (pc + 1, mp - 1, mem) + case '+' => (pc + 1, mp, write(mem, mp, sread(mem, mp) + 1)) + case '-' => (pc + 1, mp, write(mem, mp, sread(mem, mp) - 1)) + case '.' => { print(sread(mem, mp).toChar); (pc + 1, mp, mem) } + case ',' => (pc + 1, mp, write(mem, mp, Console.in.read().toByte)) + case '[' => + if (sread(mem, mp) == 0) (tb(pc), mp, mem) else (pc + 1, mp, mem) + case ']' => + if (sread(mem, mp) != 0) (tb(pc), mp, mem) else (pc + 1, mp, mem) + case _ => (pc + 1, mp, mem) + } + compute3(pg, tb, new_pc, new_mp, new_mem) + } + else mem +} + +def run3(pg: String, m: Mem = Map()) = { + val pg_opt = optimise(pg) + compute3(pg_opt, jtable(pg_opt), 0, 0, m) +} + + +// 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"))) + + + +// (7) Write a function combine which replaces sequences +// of repated increment and decrement commands by appropriate +// two-character commands. For example for sequences of + +// +// orig bf-cmds | replacement +// ------------------------------ +// + | +A +// ++ | +B +// +++ | +C +// | +// ... | +// | +// +++....+++ | +Z +// (where length = 26) +// +// Similar for the bf-command -, > and <. All other commands should +// be unaffected by this change. +// +// Adapt the compute4 and run4 functions such that they can deal +// appropriately with such two-character commands. + +def splice(cs: List[Char], acc: List[(Char, Int)]) : List[(Char, Int)] = (cs, acc) match { + case (Nil, acc) => acc + case ('[' :: cs, acc) => splice(cs, ('[', 1) :: acc) + case (']' :: cs, acc) => splice(cs, (']', 1) :: acc) + case ('.' :: cs, acc) => splice(cs, ('.', 1) :: acc) + case (',' :: cs, acc) => splice(cs, (',', 1) :: acc) + case ('0' :: cs, acc) => splice(cs, ('0', 1) :: acc) + case (c :: cs, Nil) => splice(cs, List((c, 1))) + case (c :: cs, (d, n) :: acc) => + if (c == d && n < 26) splice(cs, (c, n + 1) :: acc) + else splice(cs, (c, 1) :: (d, n) :: acc) +} + +def spl(s: String) = splice(s.toList, Nil).reverse + +//spl(load_bff("benchmark.bf")) + +def combine(s: String) : String = { + (for ((c, n) <- spl(s)) yield c match { + case '>' => List('>', (n + '@').toChar) + case '<' => List('<', (n + '@').toChar) + case '+' => List('+', (n + '@').toChar) + case '-' => List('-', (n + '@').toChar) + case _ => List(c) + }).flatten.mkString +} + + +//combine(load_bff("benchmark.bf")) + +def compute4(pg: String, tb: Map[Int, Int], pc: Int, mp: Int, mem: Mem) : Mem = { + if (0 <= pc && pc < pg.length) { + val (new_pc, new_mp, new_mem) = pg(pc) match { + case '0' => (pc + 1, mp, write(mem, mp, 0)) + case '>' => (pc + 2, mp + (pg(pc + 1) - '@'), mem) + case '<' => (pc + 2, mp - (pg(pc + 1) - '@'), mem) + case '+' => (pc + 2, mp, write(mem, mp, sread(mem, mp) + (pg(pc + 1) - '@'))) + case '-' => (pc + 2, mp, write(mem, mp, sread(mem, mp) - (pg(pc + 1) - '@'))) + case '.' => { print(sread(mem, mp).toChar); (pc + 1, mp, mem) } + case ',' => (pc + 1, mp, write(mem, mp, Console.in.read().toByte)) + case '[' => + if (sread(mem, mp) == 0) (tb(pc), mp, mem) else (pc + 1, mp, mem) + case ']' => + if (sread(mem, mp) != 0) (tb(pc), mp, mem) else (pc + 1, mp, mem) + case _ => (pc + 1, mp, mem) + } + compute4(pg, tb, new_pc, new_mp, new_mem) + } + else mem +} + +def run4(pg: String, m: Mem = Map()) = { + val pg_opt = combine(optimise(pg)) + compute4(pg_opt, jtable(pg_opt), 0, 0, m) +} + +// testcases +//combine(optimise(load_bff("benchmark.bf"))) // => """>A+B[A-A]++>>>+++++>++>+<<<<<<]>>>>>++++++>--->>>>>>>>>>+++++++++++++++[[ +>>>>>>>>>]+[<<<<<<<<<]>>>>>>>>>-]+[>>>>>>>>[-]>]<<<<<<<<<[<<<<<<<<<]>>>>>>>>[-]+ +<<<<<<<+++++[-[->>>>>>>>>+<<<<<<<<<]>>>>>>>>>]>>>>>>>+>>>>>>>>>>>>>>>>>>>>>>>>>> +>+<<<<<<<<<<<<<<<<<[<<<<<<<<<]>>>[-]+[>>>>>>[>>>>>>>[-]>>]<<<<<<<<<[<<<<<<<<<]>> +>>>>>[-]+<<<<<<++++[-[->>>>>>>>>+<<<<<<<<<]>>>>>>>>>]>>>>>>+<<<<<<+++++++[-[->>> +>>>>>>+<<<<<<<<<]>>>>>>>>>]>>>>>>+<<<<<<<<<<<<<<<<[<<<<<<<<<]>>>[[-]>>>>>>[>>>>> +>>[-<<<<<<+>>>>>>]<<<<<<[->>>>>>+<<+<<<+<]>>>>>>>>]<<<<<<<<<[<<<<<<<<<]>>>>>>>>> +[>>>>>>>>[-<<<<<<<+>>>>>>>]<<<<<<<[->>>>>>>+<<+<<<+<<]>>>>>>>>]<<<<<<<<<[<<<<<<< +<<]>>>>>>>[-<<<<<<<+>>>>>>>]<<<<<<<[->>>>>>>+<<+<<<<<]>>>>>>>>>+++++++++++++++[[ 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+>>>]>[-]+<]]+>[-<[>>>>>>>>>]<<<<<<<<]>>>>>>>>]<<<<<<<<<[<<<<<<<<<]>>>>[-]<<<++++ ++[-[->>>>>>>>>+<<<<<<<<<]>>>>>>>>>]>>>>>->>>>>>>>>>>>>>>>>>>>>>>>>>>-<<<<<<[<<<< +<<<<<]]>>>] diff -r c51305a2217f -r c989f50da5de testing5/sierpinski.bf --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/testing5/sierpinski.bf Thu Dec 06 18:56:26 2018 +0000 @@ -0,0 +1,3 @@ +++++++++[>+>++++<<-]>++>>+<[-[>>+<<-]+>>]>+[-<<<[ +->[+[-]+>++>>>-<<]<[<]>>++++++[<<+++++>>-]+<<++.[-]<< +]>.>+[>>]>+]