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Program_runtime.ts
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Program_runtime.ts
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// I'm writing this in functional style to serve as a basis for the compile-time version
type State = {
instructions: string;
memoryTape: number[];
instructionPointer: number;
memoryTapePointer: number;
stdout: string;
matching: number;
};
const brainfudge = (state: State): State => {
const {
instructions,
memoryTape,
instructionPointer,
memoryTapePointer,
stdout,
matching,
} = state;
if (instructionPointer === instructions.length) {
return state;
}
const instruction = instructions[instructionPointer];
if (matching !== 0) {
const newMatching =
instruction === "["
? matching + 1
: (instruction === "]"
? matching - 1
: matching);
return brainfudge(
newMatching === 0
? {
...state,
instructionPointer: instructionPointer + 1,
matching: newMatching,
}
: {
...state,
instructionPointer: instructionPointer + (newMatching > 0 ? 1 : -1),
matching: newMatching,
}
);
}
const interpret = (): State => {
switch (instructions[instructionPointer]) {
case ">":
return {
...state,
memoryTapePointer: memoryTapePointer + 1,
memoryTape:
memoryTapePointer + 1 >= memoryTape.length
? [...memoryTape, 0]
: memoryTape,
instructionPointer: instructionPointer + 1,
};
case "<":
return {
...state,
memoryTapePointer: memoryTapePointer - 1,
instructionPointer: instructionPointer + 1,
};
case "+": {
const newMemoryTape = [...memoryTape];
newMemoryTape[memoryTapePointer] += 1;
return {
...state,
memoryTape: newMemoryTape,
instructionPointer: instructionPointer + 1,
};
}
case "-": {
const newMemoryTape = [...memoryTape];
newMemoryTape[memoryTapePointer] -= 1;
return {
...state,
memoryTape: newMemoryTape,
instructionPointer: instructionPointer + 1,
};
}
case ".": {
return {
...state,
stdout: stdout + String.fromCharCode(memoryTape[memoryTapePointer]),
instructionPointer: instructionPointer + 1,
};
}
case ",": {
throw new Error(
`Symbol not implemented: ${instructions[instructionPointer]}`
);
}
case "[":
return memoryTape[memoryTapePointer] === 0
? {
...state,
instructionPointer: instructionPointer + 1,
matching: 1,
}
: { ...state, instructionPointer: instructionPointer + 1 };
case "]":
return memoryTape[memoryTapePointer] !== 0
? {
...state,
instructionPointer: instructionPointer - 1,
matching: -1,
}
: { ...state, instructionPointer: instructionPointer + 1 };
default:
throw new Error(
`Symbol not implemented: ${instructions[instructionPointer]}`
);
}
};
return brainfudge(interpret());
};
const inputState = {
instructions:
"++++++++[>++++[>++>+++>+++>+<<<<-]>+>+>->>+[<]<-]>>.>---.+++++++..+++.>>.<-.<.+++.------.--------.>>+.>++.",
memoryTape: [0],
instructionPointer: 0,
memoryTapePointer: 0,
stdout: "",
matching: 0
} satisfies State;
const result = brainfudge(inputState);
console.log(JSON.stringify(result));