From a532676b17af062f403a2eac4299e2ba295e51b7 Mon Sep 17 00:00:00 2001
From: NerdyPepper <akshayoppiliappan@gmail.com>
Date: Sun, 24 Feb 2019 12:49:18 +0530
Subject: refactor

---
 src/main.rs | 46 +++++++++++++++++++++++++++++++++++-----------
 1 file changed, 35 insertions(+), 11 deletions(-)

(limited to 'src')

diff --git a/src/main.rs b/src/main.rs
index 0a13e3e..02473ae 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,17 +1,18 @@
 use std::str;
 
+#[derive(Debug)]
 struct Token {
     kind: String,
     val: String,
 }
 
 fn main() {
-    let input: &str = "2y + 11 + sin(5)";
+    let input: &str = "2y + 11 ^ x";
     let input = input.replace(" ", "");
     println!("{}", input);
 
-    let mut num_vec: Vec<char> = vec![];
-    let mut char_vec: Vec<char> = vec![];
+    let mut num_vec: String = String::new();
+    let mut char_vec: String = String::new();
 
     let mut result: Vec<Token> = vec![];
 
@@ -21,19 +22,42 @@ fn main() {
         } else if letter == '.' {
             num_vec.push(letter);
         } else if letter.is_alphabetic() {
-            if num_vec.len() > 0 {
-                let token = Token {
-                    kind: "Literal".into(),
-                    val: num_vec.iter().collect::<String>()
-                };
-                result.push(token);
-                char_vec.push(letter);
+            let literal = buffer_to_token("Literal", &num_vec[..]);
+            if let Some(x) = literal {
+                result.push(x);
             }
+            char_vec.push(letter);
+            num_vec.clear();
         } else if is_operator(letter) {
-
+            let literal = buffer_to_token("Literal", &num_vec[..]);
+            let variable = buffer_to_token("Variable", &char_vec[..]);
+            if let Some(x) = literal {
+                result.push(x);
+            }
+            if let Some(x) = variable {
+                result.push(x);
+            }
+            num_vec.clear();
+            char_vec.clear();
+            result.push(Token { kind: "Operator".into(), val: letter.to_string() });
+        }
+        println!("{}", letter);
+        for token in &result {
+            println!("{:?}", token);
         }
     }
+}
 
+fn buffer_to_token(k: &str, v: &str) -> Option<Token> {
+    if v.len() > 0 {
+        let token = Token {
+            kind: k.into(),
+            val: v.chars().collect::<String>()
+        };
+        Some(token)
+    } else {
+        None
+    }
 }
 
 fn is_operator(x: char) -> bool {
-- 
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