begin writing parser

argus-parser/src/lexer.rs

@@ -0,0 +1,41 @@
+use std::collections::HashMap;
+use std::{env, fmt, fs};
+
+use ariadne::{sources, Color, Label, Report, ReportKind};
+use chumsky::prelude::*;
+
+pub type Span = SimpleSpan<usize>;
+
+#[derive(Clone, Debug, PartialEq)]
+pub enum Token<'src> {
+    Semicolon,
+    LBracket,
+    RBracket,
+    LParen,
+    RParen,
+    Comma,
+    Bool(bool),
+    Num(&'src str),
+    Ident(&'src str),
+    Minus,
+    Plus,
+    Times,
+    Divide,
+    Lt,
+    Le,
+    Gt,
+    Ge,
+    Eq,
+    Neq,
+    Assign,
+    Not,
+    And,
+    Or,
+    Implies,
+    Xor,
+    Equiv,
+    Next,
+    Always,
+    Eventually,
+    Until,
+}