From 9c018d2fe2f7bca417b63cf2400eca1f18e01fc4 Mon Sep 17 00:00:00 2001
From: ishanjain28 <ishanjain28@gmail.com>
Date: Tue, 5 Feb 2019 14:27:20 +0530
Subject: [PATCH] Added REPL

---
 src/main.rs     |  5 ++++-
 src/repl/mod.rs | 27 +++++++++++++++++++++++++++
 2 files changed, 31 insertions(+), 1 deletion(-)
 create mode 100644 src/repl/mod.rs

diff --git a/src/main.rs b/src/main.rs
index eb2fb5d..b0c3820 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -2,8 +2,11 @@
 extern crate lazy_static;
 
 mod lexer;
+mod repl;
 
-fn main() {}
+fn main() {
+    repl::init();
+}
 
 #[cfg(test)]
 mod tests {
diff --git a/src/repl/mod.rs b/src/repl/mod.rs
new file mode 100644
index 0000000..ae1b975
--- /dev/null
+++ b/src/repl/mod.rs
@@ -0,0 +1,27 @@
+use crate::lexer::Lexer;
+use std::io::{self, BufRead, Write};
+
+const PROMPT: &'static str = ">> ";
+
+pub fn init() {
+    let stdin = io::stdin();
+    let read_handle = stdin.lock();
+    let stdout = io::stdout();
+    let write_handle = stdout.lock();
+
+    start(read_handle, write_handle);
+}
+
+fn start<R: BufRead, W: Write>(mut ip: R, mut out: W) {
+    loop {
+        out.write_fmt(format_args!("{}", PROMPT)).unwrap();
+        out.flush().unwrap();
+        let mut s = String::new();
+        ip.read_line(&mut s).unwrap();
+        let tokens = Lexer::new(&s);
+
+        for token in tokens {
+            println!("{:?}", token);
+        }
+    }
+}