input handling

1 files changed, 15 insertions, 6 deletions

diff --git a/src/lib.rs b/src/lib.rs
index 527ddb8..e08796d 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,13 +1,22 @@
 pub mod ui;
 
-enum Token {
-    Operand(f64),
-    Operator(Operator),
-}
-
-enum Operator {
+pub enum Operator {
     Add,
     Sub,
     Mul,
     Div,
 }
+
+impl Operator {
+    pub fn parse(c: char) -> Result<Self, ParseOperatorError> {
+        match c {
+            '+' => Ok(Self::Add),
+            '-' => Ok(Self::Sub),
+            '*' => Ok(Self::Mul),
+            '/' => Ok(Self::Div),
+            _ => Err(ParseOperatorError(c)),
+        }
+    }
+}
+
+pub struct ParseOperatorError(char);