monkey-interpreter/src/repl.rs

use crate::{lexer::Lexer, parser::Program};
use std::io::{self, BufRead, Write};

const PROMPT: &str = ">> ";

pub fn init() {
    let stdin = io::stdin();
    let read_handle = stdin.lock();
    let stdout = io::stdout();
    let write_handle = stdout.lock();

    start(read_handle, write_handle);
}

fn start<R: BufRead, W: Write>(mut ip: R, mut out: W) {
    loop {
        out.write_all(PROMPT.as_bytes()).unwrap();
        out.flush().unwrap();
        let mut s = String::new();
        ip.read_line(&mut s).unwrap();
        let tokens = Lexer::new(&s);

        for token in tokens.clone() {
            println!("{:?}", token);
        }

        let parser = Program::parse(tokens);
        println!("parser={:?}", parser);
    }
}