use crate::*; mod errors; mod parser; mod resolver; mod scanner; pub mod interpreter; pub fn main() { let mut args = env::args(); if args.len() > 2 { println!("Usage: rlox [script]"); process::exit(1); } else if let Some(file) = args.nth(1) { run_file(&file); } else { run_prompt(); } } // Run Lox code from a file and print results to stdout fn run_file(file: &str) { let contents = fs::read_to_string(file).expect("failed to read the input file"); let mut lox = treewalk::interpreter::Interpreter::create(); run(&mut lox, &contents); } // Evaluate Lox code interactively in a shitty REPL. fn run_prompt() { let mut line = String::new(); let mut lox = treewalk::interpreter::Interpreter::create(); loop { print!("> "); io::stdout().flush().unwrap(); io::stdin() .read_line(&mut line) .expect("failed to read user input"); run(&mut lox, &line); line.clear(); } } fn run(lox: &mut treewalk::interpreter::Interpreter, code: &str) { let chars: Vec<char> = code.chars().collect(); let result = scanner::scan(&chars) .and_then(|tokens| parser::parse(tokens)) .and_then(|program| lox.interpret(program).map_err(|e| vec![e])); if let Err(errors) = result { report_errors(errors); } } fn report_errors(errors: Vec<errors::Error>) { for error in errors { errors::report(&error); } }