initial commit

src/main.rs

@@ -0,0 +1,39 @@
+use std::{
+    ffi::OsStr,
+    io::{BufRead, BufReader},
+};
+
+mod parser;
+mod token;
+mod util;
+
+use parser::{print_error, Expr, Module, TokenCursor};
+
+fn main() {
+    let arg = std::env::args_os().nth(1);
+    if let Some(file) = arg {
+        run_file(&file);
+    } else {
+        run_stdin();
+    }
+}
+
+fn run_file(path: &OsStr) {
+    let file = std::fs::read_to_string(path).expect("failed to read file");
+    let tokens = token::parse(&file).unwrap();
+    match Module::parse(&mut TokenCursor::from(tokens.as_slice())) {
+        Err(err) => print_error(err, &file),
+        Ok(module) => println!("{module:#?}"),
+    }
+}
+
+fn run_stdin() {
+    for line in BufReader::new(std::io::stdin()).lines() {
+        let str = &line.expect("failed to read line");
+        let tokens = token::parse(str).unwrap();
+        println!(
+            "{:?}",
+            Expr::parse(&mut TokenCursor::from(tokens.as_slice()))
+        );
+    }
+}