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project aiming to implement an instruction set simulator aimed to the brainhug ISA. An ISA implementing the Brainf*ck programming language at the ISA level. diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..a10a868 --- /dev/null +++ b/src/main.rs @@ -0,0 +1,81 @@ +use clap::Parser; + +use std::fs::File; +use std::io::prelude::*; + +#[derive(Parser, Debug)] +#[command(author, version, about, long_about = None)] +struct Args { + #[arg(short, long)] + program: String, + + #[arg(short, long)] + input: String, + + #[arg(short, long)] + output: Option, +} + +struct BrainhugCore { + cells: [u8; 30000], + pointer: u16, +} + +fn main() { + let args = Args::parse(); + + let mut file = File::open(args.program).unwrap(); + let mut contents = String::new(); + file.read_to_string(&mut contents).unwrap(); + let mut chars : Vec<_> = contents.chars().collect(); + + let mut file_read = File::open(args.input).unwrap(); + let mut contents_read = String::new(); + file_read.read_to_string(&mut contents_read).unwrap(); + let mut chars_read : Vec<_> = contents_read.chars().collect(); + + let mut pc : usize = 0; + let mut pointer : usize = 0; + let mut cells = [0u8; 30000]; + + let mut bracket_pairs = vec![None; chars.len()]; + let mut stack: Vec = Vec::new(); + for (i, &c) in chars.iter().enumerate() { + if c == '[' { + stack.push(i); + } else if c == ']' { + let open = stack.pop().unwrap(); + bracket_pairs[i] = Some(open); + bracket_pairs[open] = Some(i); + } + } + + let mut readPointer : usize = 0; + + while pc < chars.len() { + match chars[pc] { + '>' => pointer = pointer + 1, + '<' => pointer = pointer - 1, + '+' => cells[pointer] = cells[pointer] + 1, + '-' => cells[pointer] = cells[pointer] - 1, + '.' => println!("{}", cells[pointer] as char), + ',' => { + cells[pointer] = chars_read[readPointer] as u8; + readPointer += 1; + }, + '[' => { + if cells[pointer] == 0 { + pc = bracket_pairs[pc].unwrap(); + } + }, + ']' => { + if cells[pointer] != 0 { + pc = bracket_pairs[pc].unwrap(); + } + }, + _ => {}, + } + + pc = pc + 1; + } +}