use std::io::{self, Write};

mod evaluator;
mod lexer;
mod parser;

fn main() {
    let env = evaluator::core_environment();
    let mut input = String::new();

    println!("MAL -- REPL");

    loop {
        print!("> ");
        io::stdout().flush().expect("failed to write to stdout");

        let bytes_read = io::stdin()
            .read_line(&mut input)
            .expect("failed to read from stdin");

        if bytes_read == 0 {
            break;
        }

        let tokens = lexer::read(&input).unwrap();
        let ast = parser::parse(tokens).unwrap();
        let res = evaluator::eval(env.clone(), ast).unwrap();

        for expr in res {
            println!("{expr}")
        }

        input.clear();
    }
}