repl

src/main.rs

@@ -1,31 +1,7 @@
 mod lexer;
+mod repl;
 mod token;
 
-use crate::lexer::LexerTraits;
-use lexer::new;
-
 fn main() {
-    let input = "let five = 5;
+    repl::start_repl();
-    let ten = 10;
-    let add = fn(x, y) {
-        x + y;
-    };
-    let result = add(five, ten);
-    !-/*5; 
-    5 < 10 > 5;
-
-    if (5 < 10) {
-        return true;
-    } else {
-        return false;
-    }
-
-    10 == 10;
-    10 != 9;";
-
-    let mut l = new(input.to_string());
-
-    for (_i, tok) in (0..80).map(|_| l.next_token()).enumerate() {
-        println!("{}: {:?}", tok.type_, tok.literal);
-    }
 }

src/repl/mod.rs

@@ -0,0 +1,27 @@
+use crate::lexer::LexerTraits;
+use crate::lexer::new;
+
+const PROMPT: &str = ">> ";
+
+pub fn start_repl() {
+    println!("Welcome to the REPL! Type 'exit' to quit.");
+    loop {
+        print!("{}", PROMPT);
+        let mut input = String::new();
+        std::io::stdin()
+            .read_line(&mut input)
+            .expect("Failed to read line");
+        let input = input.trim();
+        if input == "exit" {
+            break;
+        }
+        let mut lexer = new(input.to_string());
+        loop {
+            let token = lexer.next_token();
+            if token.type_ == "EOF" {
+                break;
+            }
+            println!("Token: {:?}, Literal: {:?}", token.type_, token.literal);
+        }
+    }
+}