crftng-intrprtrs/src/main.rs

mod lexer;

use lexer::Lexer;
use std::{fs, io, path};
use tracing::Level;
use tracing_subscriber::{EnvFilter, FmtSubscriber};

fn run_file(file: &path::Path) -> Result<(), io::Error> {
	let src = fs::read_to_string(file)?;
	run(&src).unwrap();
	Ok(())
}

fn run_repl() {
	let mut line_buf = String::new();
	loop {
		match io::stdin().read_line(&mut line_buf) {
			Ok(_) => {
				let line = line_buf.trim();
				run(line).unwrap();
				line_buf.clear();
			}
			Err(_e) => unimplemented!(),
		}
	}
}

fn run(code: &str) -> Result<(), Vec<lexer::LexingError>> {
	let mut lexer = Lexer::new(code);
	println!("{:?}", lexer.scan_tokens()?);
	Ok(())
}

fn main() {
	dotenv::dotenv().ok();
	let subscriber = FmtSubscriber::builder()
		.with_max_level(Level::TRACE)
		.with_env_filter(EnvFilter::from_env("LOG"))
		.finish();
	tracing::subscriber::set_global_default(subscriber).unwrap();

	if let Some(file) = std::env::args_os().nth(1) {
		run_file(file.as_ref()).unwrap();
	} else {
		run_repl()
	}
}