renamed language, added operator precedence

src/lex/operator.rs

@@ -8,6 +8,15 @@ pub enum Operator {
 	Slash, // division
 }
 
+impl Operator {
+	pub fn get_precedence(&self) -> usize {
+		match self {
+			Operator::Plus | Operator::Minus => 0,
+			Operator::Star | Operator::Slash => 1,
+		}
+	}
+}
+
 pub fn parse_operator(input: &str) -> Option<(Token, &str)> {
 	let c: char = input.chars().next()?;
 	let input = &input[1..];