map_group(): Parse input full of `blank()` to `MapGroup` default

An input with all mixed whitespace and comments should behave the same
as empty input.

1 files changed, 17 insertions, 1 deletions

diff --git a/src/parser.rs b/src/parser.rs
index 1c21510..8df629d 100644
--- a/src/parser.rs
+++ b/src/parser.rs
@@ -646,6 +646,10 @@ where
     I::Error: ParseError<I::Item, I::Range, I::Position>,
 {
     or(
+        (
+            blank(),
+            eof(),
+        ).map(|_| MapGroup::default()),
         definitions()
             .map(|definitions| {
                 // MapGroup {
@@ -679,7 +683,6 @@ where
 
                 map_group
             }),
-        eof().map(|()| MapGroup::default()),
     )
 }
 
@@ -1373,6 +1376,19 @@ cmd <play> /usr/bin/say hello
     }
 
     #[test]
+    fn map_group_skipped_input_outputs_default_map_group() {
+        let text = "
+# test
+    # a test
+    ";
+        let result = map_group().easy_parse(text).map(|t| t.0);
+        let expected = MapGroup::default();
+        println!("{:?}", map_group().easy_parse(text).map(|t| t.1));
+
+        assert_eq!(result, Ok(expected));
+    }
+
+    #[test]
     fn map_group_with_invalid_input_fails() {
         let text = "not-a-kind <play> <Nop>
 ";