/* Live Brainfuck Interpreter Author: 83338 Date: Friday, April 5th 2019 Brainfuck is an an esoteric programming language with very little commands. You have a list of cells. Each cell can be increased or decreased. A pointer will itterate through code evaluating each instruction on the cell it's pointing at. The commands are: (>) : Move pointer right one. (<) : Move pointer left one. (+) : Increase cell value by one. (-) : Decrease cell value by one. (.) : Print the character code of the current cell value. Eg, 65 = "A". (,) : Request user input. Value will be should be a character code. ([) : Opening loop. Will continue to loop the code in the brackets until the first value that the loop started on equals zero. (]) : Closing loop. Jump back to begining of the loop. All whitespace is ignored. Anything that isn't a Brainfuck command will be ignored. Inspired by: Flandre Scarlet (Sololearner). https://bit.ly/1jHafYE Read more: https://wikipedia.org/wiki/Brainfuck https://esolangs.org/wiki/brainfuck https://brainfuck.org https://youtu.be/-3C200nCwpk '83338 */ "use strict"; const d = document; const {abs, round, random} = Math; const $ = d.querySelector.bind(d); const $$ = d.querySelectorAll.bind(d); // Debug Functions const log = console.log.bind(this); const error = console.error.bind(this); const json = JSON.stringify.bind(this); let memory = Array(5).fill(0); let [itter, pointer] = [0, 0]; let data = ""; let input, membal, tmpPos; function step(memory, code) { if (itter > code.length) { return {memory, data, code}; }; display(memory, pointer, data, code[itter]); $("#code").value = position($("#code").value, itter); switch (code[itter]) { case ">": if (memory.length-1 <= ++pointer) memory.push(0); itter++; break; case "<": if (--pointer <= -1) pointer = memory.length-1; itter++; break; case "+": memory[pointer]++; itter++; break; case "-": memory[pointer]--; itter++; break; case ".": data += String.fromCharCode(memory[pointer]); itter++; break; case ",": memory[pointer] = parseInt(prompt("Input: ")) || 10; itter++; break; case "[": if (memory[pointer] === 0) { [membal, tmpPos] = [1, itter]; while (membal !== 0) { tmpPos++; (code[tmpPos] == "[" ? membal++ : null); (code[tmpPos] == "]" ? membal-- : null); }; itter = tmpPos+1; } else itter++; break; case "]": if (memory[pointer] !== 0) { [membal, tmpPos] = [1, itter]; while (membal !== 0) { tmpPos--; (code[tmpPos] == "[" ? membal-- : null); (code[tmpPos] == "]" ? membal++ : null); }; itter = tmpPos+1; } else itter++; break; default: itter++; }; }; function display(m, p, d, c) { [$("#memory").innerHTML, $("#pointer").innerHTML] = [null, null]; [$("#action").innerHTML, $("#console").innerHTML] = [`

Action: ${c || "None"}

`, (d || "")]; for (let i in m) { $("#memory").innerHTML += `

${m[i]}

`; }; for (let i = 0; i <= p; i++) { $$(".box")[i].style.fontWeight = (i == p ? "bolder" : "normal"); $("#pointer").innerHTML += `

${i == p ? "^" : "-"}

`; }; }; function extract(t) { return t.split("").filter(i => "<>+-[],.".split("").includes(i)).join(""); }; function position(t, n) { let [txt, e] = [t.split(""), 0]; for (let i in txt) { if ("<>+-[],.".split("").includes(txt[i])) { txt[i] = txt[i]+(++e); }; }; for (let i in txt) { for (let j in txt[i]) { if ("<>+-[],.".split("").includes(txt[i][j])) { if (txt[i].substr(1, txt[i].length-1) == n) { txt = txt.map(i => i.replace(/\*/g, "")) txt[i] = `*${txt[i]}*`; }; }; }; }; return txt.join("").replace(/\d/g, ""); }; // DOM & GUI onload = () => { const mem = $("#memory"); const flow = $("#flow"); const step_control = $("#step"); const range = $("input[type=range]"); const reset = $("#reset"); const editor = $("#code"); const rand = $("#rand"); editor.value = window.programs[0]; display(memory, pointer, data); let i = 0; let code = extract(editor.value); flow.addEventListener("click", () => { if (++i%2 == 1) { flow.innerHTML = "Stop"; window.s = setInterval(() => { step(memory, code); [ reset.disabled, step_control.disabled, range.disabled, rand.disabled ] = [,,,,].fill(true); }, range.value); } else { flow.innerHTML = "Start"; clearInterval(window.s); [ reset.disabled, step_control.disabled, range.disabled, rand.disabled ] = [,,,,].fill(false); }; }); reset.addEventListener("click", () => { [itter, pointer] = [0, 0]; [memory, data] = [Array(5).fill(0), ""]; [input, membal, tmpPos] = [,,,].fill(null); display(memory, data); }); rand.addEventListener("click", () => { const n = editor.value; do { editor.value = window.programs[~~(random()*window.programs.length)]; } while (editor.value == n); }); addEventListener("click", () => code = extract(editor.value)); step_control.addEventListener("click", () => step(memory, code)); range.addEventListener("input", () => $("#val").innerHTML = range.value); }; // Not really related. // Sample programs. // Some pulled from brainfuck.org. window.programs = [ // Hello World `Hello World +++++ +++++ Initialize [ Loop set > +++++ ++ > +++++ +++++ > +++ > + <<<< - ] > ++ . print "H" > + . print "e" +++++ ++ . print "l" . print "l" +++ . print "o" > ++ . print " " << +++++ +++++ +++++ . print "W" > . print "o" +++ . print "r" ----- - . print "l" ----- --- . print "d" > + . print "!" > . print "\\n" `, // Hello World Compact `Hello World ++++++++[>++++[>++>+++>+++>+<<<<-]>+>+>->>+[<]<-]>>.>---.+++++++..+++.>>.<-.<.+++.------.--------.>>+.>.`, // Heart `Ascii Heart >>>>>>>>>++++++++++>>++++[->++++[->+>++>+++>++>++>++<<<<<<]<]>>>>------<>>>>+++[-------<.>]<<<<++++[---->.<]>>>+++[-----<.>]<<<<++[-->>.<<]<<<<.---------->>>>>>++++++<<++++[->++++[->--->--><<<]<]<<<<<<<<<<<<<>++++[->++++[->++>++>+++>+++>++>+>+<<<<<<<]<]>>>>------<>>>>-[-----<.>]<<<<++++[--->.<]>>>>>++++[----<<.>>]<<<<<<++++[--->>.<<]>>>>>>++++++++++.<<<<<<<<<>>>>>>>>>>>>>>>>>>>++++++++++<<<<<<<<<<>>++++[->++++[->>++>+++>++>><<<<<<]<]>>>>------<>>.>><<<<++[->.<]<<<<++[->>>+>>>>+>+>.<<<<<<<<++++[->++++[->>++<<]<]>>>>>>>[-<<<<<+>>>>>]+<<<<<[->>>.<<<]>[->.<]>>>>[-<<<<-->>>>]+<<<<<<<<]++[->>>+>>>>+>+>.<<<<<<<<++++[->++++[->>++<<]<]>>>>>>>+[-<<<<<+>>>>>]+<<<<<[->>>.<<<]+>--[->.<]>>>>[-<<<<---->>>>]+<<<<<<<<]++[->>>+>>>>+>+>.<<<<<<<<++++[->++++[->>++<<]<]>>>>>>>+++[-<<<<<+>>>>>]+<<<<<[->>>.<<<]+++>------[->.<]>>>>[-<<<<-------->>>>]+<<<<<<<<]++[->>>+>>>>+>+>.<<<<<<<<++++[->++++[->>++<<]<]>>>>>>>+++++[-<<<<<+>>>>>]+<<<<<[->>>.<<<]+++++>----------[->.<]>>>>[-<<<<------------>>>>]+<<<<<<<<]>>>>>>>>>.<<<...............<......>>>>.<<<................<....>>>>.<<<.................<..>>>>.<<<................<..>>>>.<<<<<<<`, // Random Integer `Random Integer >>>++[ <++++++++[ <[<++>-]>>[>>]+>>+[ -[->>+<<<[<[<<]<+>]>[>[>>]]] <[>>[-]]>[>[-<<]>[<+<]]+<< ]<[>+<-]>>- ]<.[-]>> ] "Random" byte generator using the Rule 30 automaton. Doesn't terminate; you will have to kill it. To get x bytes you need 32x+4 cells. Turn off any newline translation! By Daniel B Cristofani http://www.hevanet.com/cristofd/brainfuck/`, // Fibonacci Sequence `Fibonacci Sequence >++++++++++>+>+[ [+++++[>++++++++<-]>.<++++++[>--------<-]+<<<]>.>>[ [-]<[>+<-]>>[<<+>+>-]<[>+<-[>+<-[>+<-[>+<-[>+<-[>+<- [>+<-[>+<-[>+<-[>[-]>+>+<<<-[>+<-]]]]]]]]]]]+>>> ]<<< ] This program doesn't terminate; you will have to kill it. By Daniel B Cristofani http://www.hevanet.com/cristofd/brainfuck/`, // Next Character Finder `Next Character ,+.` ]; alert("Code by 83338 alias Kaimi on Sololearn.\n\nSome sample brainfuck programs are created by Daniel Christofani.\n\nhttp://www.hevanet.com/cristofd/brainfuck/\n\nCode is free to copy/share with or without credits.") // ~83338 // Pi

Live Brainfuck Editor