From 5385cffe564eb3ddec78eecf6ffff30bdfc49bf4 Mon Sep 17 00:00:00 2001
From: NerdyPepper <akshayoppiliappan@gmail.com>
Date: Tue, 19 Mar 2019 23:12:59 +0530
Subject: basic REPL functionality

---
 src/main.rs | 24 +++++++++++++++++-------
 1 file changed, 17 insertions(+), 7 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 78a05b0..aaf285d 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,5 @@
+use std::io::{ stdin, stdout };
+
 #[derive(Debug, Copy, Clone, PartialEq)]
 pub struct Operator {
     token: char,
@@ -31,14 +33,22 @@ impl Operator {
 }
 
 fn main() {
-    let input = "1 + 5 * 6 + 2";
-    println!("{}", input);
-    let input = input.replace(" ", "");
-    let lexed = lexer(&input);
-    let postfixed = to_postfix(lexed.unwrap());
-    let evaled = eval_postfix(postfixed.unwrap());
+    loop {
+        let mut input = String::new();
+        stdin().read_line(&mut input).unwrap();
+
+        let input = input.trim();
+        let input = input.replace(" ", "");
 
-    println!("{:?}", evaled);
+        if input == "exit" {
+            return
+        }
+
+        let lexed = lexer(&input[..]);
+        let postfixed = to_postfix(lexed.unwrap());
+        let evaled = eval_postfix(postfixed.unwrap());
+        println!("{}", evaled.unwrap());
+    }
 }
 
 fn lexer(input: &str) -> Result<Vec<Token>, String> {
-- 
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