Initial commit

src/lex/operator.rs

@@ -0,0 +1,21 @@
+use super::Token;
+
+#[derive(Debug)]
+pub enum Operator {
+	Plus,
+	Minus,
+	Star, // multiplication
+	Slash, // division
+}
+
+pub fn parse_operator(input: &str) -> Option<(Token, &str)> {
+	let c: char = input.chars().next()?;
+	let input = &input[1..];
+	match c {
+		'+' => Some((Token::Op(Operator::Plus), input)),
+		'-' => Some((Token::Op(Operator::Minus), input)),
+		'*' => Some((Token::Op(Operator::Star), input)),
+		'/' => Some((Token::Op(Operator::Slash), input)),
+		_ => None
+	}
+}