mod object;
mod syn;

use std::io::Read;
use std::path::PathBuf;
use structopt::StructOpt;
use syn::lexer::Lexer;

#[derive(Debug, StructOpt)]
struct Opt {
    #[structopt(name = "PATH", parse(from_os_str))]
    path: Option<PathBuf>,
}

type Result<T = (), E = Box<dyn std::error::Error>> = std::result::Result<T, E>;

fn main() -> Result {
    let opt = Opt::from_args();

    let text = if let Some(path) = opt.path.as_ref() {
        std::fs::read_to_string(path)?
    } else {
        let mut input = String::new();
        std::io::stdin().read_to_string(&mut input)?;
        input
    };

    let mut lexer = Lexer::new(&text);
    while let Some(token) = lexer.next()? {
        println!("{:?}", token);
    }

    Ok(())
}