initial rust scanner

rust/rox/src/lib.rs

@@ -1,6 +1,45 @@
-use std::path::Path;
+use std::{
+    fs::{self},
+    io::{self, Write},
+    path::Path,
+};
+
+use tracing::error;
 
 pub mod cli;
+pub mod keywords;
+pub mod scanner;
+pub mod token;
+pub mod tokenizer {
+    pub mod comment;
+    pub mod identifier;
+    pub mod interface;
+    pub mod lookahead;
+    pub mod newline;
+    pub mod number;
+    pub mod single_char;
+    pub mod string;
+    pub mod whitespace;
+}
 
-pub fn compile(source: &Path) {}
-pub fn repl() {}
+pub fn compile(source: &Path) -> Result<(), io::Error> {
+    let input = fs::read_to_string(source)?;
+    let _tokens = scanner::tokenize(&input);
+
+    Ok(())
+}
+
+pub fn repl() {
+    loop {
+        print!("> ");
+        let _ = io::stdout().flush();
+
+        let mut input = String::new();
+        match io::stdin().read_line(&mut input) {
+            Ok(_) => {}
+            Err(e) => error!("{}", e),
+        }
+        let input = input.trim().to_string();
+        let _tokens = scanner::tokenize(&input);
+    }
+}