start with bare basics

src/lexer.rs

@@ -0,0 +1,58 @@
+use logos::Logos;
+
+#[derive(Logos, Debug, PartialEq)]
+#[logos(skip r"[\s]+")]
+pub enum Token<'a> {
+    #[regex("[\\w]+", |lex| lex.slice())]
+    Word(&'a str),
+    #[regex("[\\d]+", priority = 2, callback = |lex| lex.slice().parse::<i64>().unwrap())]
+    IntLiteral(i64),
+    #[regex("[\\d]+.[\\d]+", |lex| lex.slice().parse::<f64>().unwrap())]
+    FloatLiteral(f64),
+    #[regex(r#""([^"\\]|\\["\\bnfrt]|u[a-fA-F0-9]{4})*""#, |lex| lex.slice().to_owned())]
+    StringLiteral(String),
+    #[token("def")]
+    Define,
+    #[token("type")]
+    Type,
+    #[token("->")]
+    RightArrow,
+    #[token("|")]
+    Pipe,
+    #[token("[")]
+    BracketOpening,
+    #[token("]")]
+    BracketClosing,
+    #[token("(")]
+    ParensOpening,
+    #[token(")")]
+    ParensClosing,
+    #[token("{")]
+    BraceOpening,
+    #[token("}")]
+    BraceClosing,
+    #[token("+")]
+    Plus,
+    #[token("-")]
+    Minus,
+    #[token("*")]
+    Multiply,
+    #[token("/")]
+    Divide,
+    #[token("%")]
+    Percent,
+    #[token("&")]
+    Ampersand,
+    #[token(":")]
+    Colon,
+    #[token(";")]
+    Semicolon,
+    #[token(".")]
+    Dot,
+    #[token(",")]
+    Comma,
+    #[token("!")]
+    ExclaimationMark,
+    #[token("?")]
+    QuestionMark,
+}