noodling on sexp

justfile

@@ -2,5 +2,5 @@ _default:
     just --list
 
 
-test:
-    cargo nextest run
+test *args:
+    cargo nextest run {{args}}

src/primitives.rs

@@ -49,6 +49,7 @@ pub fn identifier(input: &str) -> ParseResult<&str, String, ()> {
 }
 
 pub fn whitespace(input: &str) -> ParseResult<&str, char, ()> {
+    println!("whitespace: `{input}`");
     match input.chars().next() {
         Some(ch) if ch.is_whitespace() => Ok((ch, &input[1..])),
         _ => Err(((), input)),

src/sequence.rs

@@ -12,9 +12,13 @@ pub fn surrounded_by<I, O1, O2, E>(
     surrounding: impl Parser<I, O2, E>,
 ) -> impl Parser<I, O1, E> {
     move |input| {
+        println!("surrounded_by");
         let (_result1, rest1) = surrounding.parse(input)?;
+        println!("A");
         let (result2, rest2) = main.parse(rest1)?;
+        println!("B");
         let (_result3, rest3) = surrounding.parse(rest2)?;
+        println!("C");
         Ok((result2, rest3))
     }
 }

src/test/mod.rs

@@ -67,4 +67,9 @@ fn test_repeated() {
     let output = parser.parse("bongo bongo     bongo           bongo");
     let output = output.unwrap();
     assert_eq!(output.0, vec!["bongo", "bongo", "bongo", "bongo"]);
+
+    let bongos = repeated(literal("bongo"));
+    let output = bongos.parse("tra la la").unwrap();
+    assert_eq!(output.0.len(), 0);
+    assert_eq!(output.1, "tra la la");
 }

src/test/sexp.rs

@@ -48,6 +48,7 @@ fn test_parse_atom() {
 }
 
 fn parse_expr(input: &str) -> ParseResult<&str, Expr, ()> {
+    println!("parse_expr: {input}");
     choice((parse_list, parse_atom.map(Expr::Atom))).parse(input)
 }
 
@@ -60,9 +61,17 @@ fn parse_list(input: &str) -> ParseResult<&str, Expr, ()> {
         )
         .then_ignore(literal_char(')'))
         .map(Expr::List)
+        .surrounded_by(repeated(whitespace))
         .parse(input)
 }
 
+#[test]
+fn test_parse_list() {
+    let output = parse_list.parse("\n(1 2 (1 2) 9999 3)").unwrap();
+    assert_eq!(output.1, "");
+
+}
+
 #[test]
 fn test_parse_sexp() {
     let output = parse_expr("(add 1 2)").unwrap();