main.rs: simplify tokenizer, add test

flake.nix

@@ -23,6 +23,7 @@
             cargo
             rustc
             rustfmt
+            bacon
             ;
           inherit
             (pkgsFor.${system}.rustPackages)

src/main.rs

@@ -1,6 +1,6 @@
 use std::io;
 
-#[derive(Debug)]
+#[derive(Debug, PartialEq, Eq)]
 enum Symbol {
     Number,
 
@@ -44,38 +44,27 @@ fn get_user_input() -> io::Result<String> {
     Ok(buffer)
 }
 
+#[test]
+fn try_tokenizing() {
+    let tokenized_input = tokenize("1 + 1").unwrap();
+    let result = vec![Symbol::Number, Symbol::Add, Symbol::Number];
+    assert!(tokenized_input == result, "1 + 1 not working");
+}
+
 fn tokenize(input: &str) -> Result<Vec<Symbol>, ParseError> {
     let mut tokens: Vec<Symbol> = vec![];
 
     for (i, c) in input.chars().enumerate() {
         match c {
-            ' ' => {
-                continue;
-            }
-            '(' => {
-                tokens.push(Symbol::LeftBracket);
-            }
-            ')' => {
-                tokens.push(Symbol::RightBracket);
-            }
-            '+' => {
-                tokens.push(Symbol::Add);
-            }
-            '-' => {
-                tokens.push(Symbol::Sub);
-            }
-            '*' => {
-                tokens.push(Symbol::Mul);
-            }
-            '/' => {
-                tokens.push(Symbol::Div);
-            }
-            '0'..='9' => {
-                tokens.push(Symbol::Number);
-            }
-            '\n' => {
-                break;
-            }
+            ' ' => continue,
+            '(' => tokens.push(Symbol::LeftBracket),
+            ')' => tokens.push(Symbol::RightBracket),
+            '+' => tokens.push(Symbol::Add),
+            '-' => tokens.push(Symbol::Sub),
+            '*' => tokens.push(Symbol::Mul),
+            '/' => tokens.push(Symbol::Div),
+            '0'..='9' => tokens.push(Symbol::Number),
+            '\n' => break,
             _ => return Err(ParseError::WrongTokenError { pos: i }),
         }
     }