diff -r 4de31fdc0d67 -r b5b6ed38c2f2 testing5/bf.scala --- a/testing5/bf.scala Mon Nov 02 02:31:44 2020 +0000 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,227 +0,0 @@ -// Core Part about an Interpreter for -// the Brainf***++ language -//============================================== - -object CW10a { - - -// representation of Bf memory - -type Mem = Map[Int, Int] - - -// (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. - -import io.Source -import scala.util._ - -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 ',' => (pc + 1, mp, write(mem, mp, scala.io.StdIn.readByte())) - 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) - - // new commands - case '@' => (pc + 1, mp, write(mem, sread(mem, mp), sread(mem, mp - 1))) - case '*' => (pc + 1, mp, write(mem, mp, sread(mem, mp) * sread(mem, mp -1))) - case '#' => { println(s"${sread(mem, mp)}"); (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/bf++-programs collected from the Internet -//========================================================== - - -// some contrived (small) programs -//--------------------------------- - -// clears the 0-cell -//run("[-]", Map(0 -> 100)) // Map will be 0 -> 0 - -// moves 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)) // Map(0 -> 0, 2 -> 42, 4 -> 42) - - -// prints out numbers 0 to 9 -//run("""+++++[->++++++++++<]>--<+++[->>++++++++++<<]>>++<<----------[+>.>.<+<]""") - -// bf++ program calculating the cube-function, 10 * 10 * 10 = 1000 -//run("""++++++++++#>+***#""") // Map(0 -> 10, 1 -> 1000) - - -// bf++ program copies 3 from 0-cell to to cells 1, 4, 5, 6 and 7 -// (note that because of how the program wprks cell 1 will contain 7) -//run("""+++>+@+@+@+@+@""") // Map(0 -> 3, 1 -> 7, 4 -> 3, 5 -> 3, 6 -> 3, 7 -> 3) - - - -// some more "useful" programs -//----------------------------- - -// hello world program 1 -//run("""++++++++[>++++[>++>+++>+++>+<<<<-]>+>+>->>+[<]<-]>>.>---.+++++++ -// ..+++.>>.<-.<.+++.------.--------.>>+.>++.""") - -// hello world program 2 -//run("""++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>+ -// +.<<+++++++++++++++.>.+++.------.--------.>+.>.""") - -// hello world program 3 -//run("""+++++++++[>++++++++>+++++++++++>+++++<<<-]>.>++.+++++++.. -// +++.>-.------------.<++++++++.--------.+++.------.--------.>+.""") - - -// draws the Sierpinski triangle -//run(load_bff("sierpinski.bf")) - - -//fibonacci numbers below 100 -//run("""+++++++++++ -// >+>>>>++++++++++++++++++++++++++++++++++++++++++++ -// >++++++++++++++++++++++++++++++++<<<<<<[>[>>>>>>+> -// +<<<<<<<-]>>>>>>>[<<<<<<<+>>>>>>>-]<[>++++++++++[- -// <-[>>+>+<<<-]>>>[<<<+>>>-]+<[>[-]<[-]]>[<<[>>>+<<< -// -]>>[-]]<<]>>>[>>+>+<<<-]>>>[<<<+>>>-]+<[>[-]<[-]] -// >[<<+>>[-]]<<<<<<<]>>>>>[+++++++++++++++++++++++++ -// +++++++++++++++++++++++.[-]]++++++++++<[->-<]>++++ -// ++++++++++++++++++++++++++++++++++++++++++++.[-]<< -// <<<<<<<<<<[>>>+>+<<<<-]>>>>[<<<<+>>>>-]<-[>>.>.<<< -// [-]]<<[>>+>+<<<-]>>>[<<<+>>>-]<<[<+>-]>[<+>-]<<<-]""") - -//outputs the square numbers up to 10000 -//run("""++++[>+++++<-]>[<+++++>-]+<+[>[>+>+<<-]++>>[<<+>>-]>>>[-]++>[-]+ -// >>>+[[-]++++++>>>]<<<[[<++++++++<++>>-]+<.<[>----<-]<] -// <<[>>>>>[>>>[-]+++++++++<[>-<-]+++++++++>[-[<->-]+[<<<]]<[>+<-]>]<<-]<<-]""") - - -// calculates 2 to the power of 6 -//(example from a C-to-BF compiler at https://github.com/elikaski/BF-it) -//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') -// -//run(load_bff("benchmark.bf")) - -// calculates the Collatz series for numbers from 1 to 30 -// -//run(load_bff("collatz.bf")) - -}