48 lines
1011 B
Rust
48 lines
1011 B
Rust
mod lexer;
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use lexer::Lexer;
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use std::{fs, io, path};
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use tracing::Level;
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use tracing_subscriber::{EnvFilter, FmtSubscriber};
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fn run_file(file: &path::Path) -> Result<(), io::Error> {
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let src = fs::read_to_string(file)?;
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run(&src).unwrap();
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Ok(())
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}
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fn run_repl() {
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let mut line_buf = String::with_capacity(1024);
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loop {
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match io::stdin().read_line(&mut line_buf) {
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Ok(_) => {
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let line = line_buf.trim();
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run(line).unwrap();
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line_buf.clear();
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}
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Err(_e) => unimplemented!(),
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}
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}
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}
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fn run(code: &str) -> Result<(), Vec<lexer::LexingError>> {
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let mut lexer = Lexer::new(code);
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println!("{:?}", lexer.scan_tokens()?);
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Ok(())
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}
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fn main() {
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dotenv::dotenv().ok();
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let subscriber = FmtSubscriber::builder()
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.with_max_level(Level::TRACE)
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.with_env_filter(EnvFilter::from_env("LOG"))
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.finish();
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tracing::subscriber::set_global_default(subscriber).unwrap();
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if let Some(file) = std::env::args_os().nth(1) {
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run_file(file.as_ref()).unwrap();
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} else {
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run_repl()
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}
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}
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