From 0d01692c97ea8ca6fc4b229e5b9678cb252bceda Mon Sep 17 00:00:00 2001
From: Greg Brown <gmb60@cam.ac.uk>
Date: Sat, 9 Jan 2021 14:31:02 +0000
Subject: Introduce chomp as a procedural macro.

Add a bunch of tests.

Fix chomp and chewed so autochomp compiles.
---
 chomp-macro/tests/nibble_exp.rs | 81 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 81 insertions(+)
 create mode 100644 chomp-macro/tests/nibble_exp.rs

(limited to 'chomp-macro/tests/nibble_exp.rs')

diff --git a/chomp-macro/tests/nibble_exp.rs b/chomp-macro/tests/nibble_exp.rs
new file mode 100644
index 0000000..7e31e6a
--- /dev/null
+++ b/chomp-macro/tests/nibble_exp.rs
@@ -0,0 +1,81 @@
+chomp_macro::nibble! {
+    let opt(x) = _ | x;
+    let plus(x) = [plus](x . opt(plus));
+    let star(x) = [star](opt(x . star));
+
+    let Pattern_Whitespace = "\n"|" ";
+
+    let XID_Start =
+        "a" | "b" | "c" | "d" | "e" | "f" | "g" | "h" |
+        "i" | "j" | "k" | "l" | "m" | "n" | "o" | "p" |
+        "q" | "r" | "s" | "t" | "u" | "v" | "w" | "x" |
+        "y" | "z" |
+        "A" | "B" | "C" | "D" | "E" | "F" | "G" | "H" |
+        "I" | "J" | "K" | "L" | "M" | "N" | "O" | "P" |
+        "Q" | "R" | "S" | "T" | "U" | "V" | "W" | "X" |
+        "Y" | "Z" ;
+    let XID_Continue =
+        XID_Start | "_" | "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9" ;
+
+    let literal_char = XID_Continue;
+
+    let ws = star(Pattern_Whitespace);
+    let must_ws = plus(Pattern_Whitespace);
+
+    let punctuated(x, p) = [rec](x . opt(p . ws . rec));
+    let list(x) = "(" . ws . [rec](x . opt("," . ws . opt(rec))) . ")";
+
+    let epsilon = "_";
+    let ident = XID_Start . star(XID_Continue);
+    let literal = "\"" . plus(literal_char) . "\"";
+    let parens(expr) = "(" . ws . expr . ")";
+    let fix(expr) = "[" . ws . ident . ws . "]" . ws . parens(expr);
+
+    let term(expr) =
+          epsilon . ws
+        | literal . ws
+        | parens(expr) . ws
+        | fix(expr) . ws
+        | ident . ws . opt(list(expr) . ws)
+        ;
+
+    let cat(expr) = punctuated(term(expr), ".");
+    let alt(expr) = punctuated(cat(expr), "|");
+    let expr = [expr](alt(expr));
+    match expr;
+}
+
+#[test]
+fn exp_epsilon() {
+    Ast::parse_str("_").unwrap();
+}
+
+#[test]
+fn exp_literal() {
+    Ast::parse_str(r#""foo""#).unwrap();
+}
+
+#[test]
+fn exp_cat() {
+    Ast::parse_str(r#""a" . "b""#).unwrap();
+}
+
+#[test]
+fn exp_alt() {
+    Ast::parse_str(r#""a" | "b""#).unwrap();
+}
+
+#[test]
+fn exp_ident() {
+    Ast::parse_str("foo").unwrap();
+}
+
+#[test]
+fn exp_call() {
+    Ast::parse_str(r#"opt("foo")"#).unwrap();
+}
+
+#[test]
+fn exp_fix() {
+    Ast::parse_str(r#"[rec](_ | "a" . rec)"#).unwrap();
+}
-- 
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