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it actually seems to work now

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This commit is contained in:
nora 2021-04-19 20:44:21 +02:00
parent 219f419bae
commit 1cad1f2cc7
2 changed files with 30 additions and 31 deletions
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32
bfi-rust/src/main.rs
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@ -1,5 +1,6 @@
use std::io::{stdin, Read};
use std::{env, fs};
use std::time::SystemTime;
fn main() {
let path = env::args().skip(1).next();
@ -20,9 +21,10 @@ fn run(path: String) {
let program = minify(program);
println!("Minified program: {}", program);
let start = SystemTime::now();
let out = interpret(program.chars().collect(), false);
println!("{}", out);
println!("Finished in {}ms: {}", start.elapsed().unwrap().as_millis(), out);
}
fn minify(program: String) -> String {
@ -30,19 +32,20 @@ fn minify(program: String) -> String {
program.chars().filter(|c| allowed.contains(c)).collect()
}
const MEM_SIZE: usize = 0xFFFF;
fn interpret(pgm: Vec<char>, number_debug: bool) -> String {
let mut out = String::new();
let mut pointer: usize = 0;
let mut mem: [i8; 30000] = [0; 30000];
let mut mem: [u8; MEM_SIZE] = [0; MEM_SIZE];
let mut in_buffer = [0; 1];
let mut pc = 0;
let len = pgm.len();
while pc < len {
//println!("pc: {} instruction: {}, pointer: {}", pc, pgm[pc], pointer);
match pgm[pc] {
'>' => pointer += 1,
'<' => pointer -= 1,
'>' => if pointer == MEM_SIZE - 1 { pointer = 0 } else { pointer += 1 },
'<' => if pointer == 0 { pointer = MEM_SIZE - 1 } else { pointer -= 1 },
'+' => mem[pointer] = mem[pointer].wrapping_add(1),
'-' => mem[pointer] = mem[pointer].wrapping_sub(1),
'.' => {
@ -54,35 +57,36 @@ fn interpret(pgm: Vec<char>, number_debug: bool) -> String {
}
',' => {
stdin().read(&mut in_buffer).unwrap();
mem[pointer] = in_buffer[0] as i8;
mem[pointer] = in_buffer[0] as u8;
}
'[' => {
//jump to corresponding ] so that it will get to the command after the ]
if mem[pointer] == 0 {
println!("[ found");
println!("jumping forward at location {}", pc + 1);
let mut level = 0;
while pgm[pc] != ']' || level > 0 {
while pgm[pc] != ']' || level > -1 {
pc += 1;
match pgm[pc] {
'[' => {
println!("level up");
level += 1
},
}
']' => {
println!("level down");
level -= 1
},
}
_ => (),
}
}
println!("found matching ] at location {}", pc + 1);
assert_eq!(pgm[pc], ']')
}
}
']' => {
if mem[pointer] != 0 {
println!("jumping back at location {}", pc + 1);
//jump to corresponding [
let mut level = 0;
while pgm[pc] != '[' || level > 0 {
while pgm[pc] != '[' || level > -1 {
pc -= 1;
match pgm[pc] {
'[' => level -= 1,
@ -90,6 +94,8 @@ fn interpret(pgm: Vec<char>, number_debug: bool) -> String {
_ => (),
}
}
println!("found matching [ at location {}", pc + 1);
assert_eq!(pgm[pc], '[')
}
}