1 files changed, 40 insertions, 0 deletions
diff --git a/src/parse/parsetree.rs b/src/parse/parsetree.rs
new file mode 100644
index 0000000..8887200
--- /dev/null
+++ b/src/parse/parsetree.rs
@@ -0,0 +1,40 @@
+
+use nom::{
+    IResult,
+    Parser,
+};
+
+
+#[derive(Debug,PartialEq)]
+pub enum Token {
+    ParOpen,
+    ParClose,
+    Num(i32),
+    Sym(String),
+    Whitespace(String),
+}
+
+fn parse_token(s: &str) -> IResult<&str, Token> {
+    todo!()
+}
+
+#[cfg(test)]
+mod private_parsing_tests {
+    use super::{*, Token::*};
+    use crate::parse::util::*;
+
+    #[test]
+    fn test_parse_token() {
+        assert_eq!(parse_token("()"), Ok((")", ParOpen)));
+        assert_eq!(parse_token(")"), Ok(("", ParClose)));
+
+        assert_eq!(parse_token(" \t\n"), Ok(("", whitespace(" \t\n"))));
+
+        assert_eq!(parse_token("1 23"), Ok((" 23", Num(1))));
+        assert_eq!(parse_token("23"), Ok(("", Num(23))));
+
+        assert_eq!(parse_token("Nil a"), Ok((" a", sym("Nil"))));
+        assert_eq!(parse_token("a"), Ok(("", sym("a"))));
+    }
+
+}