parser: add possible space or comment

src/parser.rs

@@ -8,12 +8,15 @@ use fasteval::Evaler;
 use nom::{
     AsBytes, AsChar, Compare, FindToken, Finish, IResult, Input, Offset, Parser as NomParser,
     branch::alt,
-    bytes::complete::{tag, take},
-    character::{complete::char, streaming::one_of},
+    bytes::complete::{tag, take, take_till},
+    character::{
+        complete::{char, space1},
+        streaming::one_of,
+    },
     combinator::value,
     error::{Error, ErrorKind},
     multi::many0,
-    sequence::preceded,
+    sequence::{delimited, preceded},
 };
 use nom_locate::LocatedSpan;
 
@@ -41,12 +44,22 @@ where
     pub fn parse_all(
         &self,
     ) -> Result<Vec<Box<dyn Token>>, Error<nom_locate::LocatedSpan<&'i str>>> {
-        many0(alt((
-            Silence::parser().map(into_box),
-            Marker::parser().map(into_box),
-            Note::parser(self.notes).map(into_box),
-            VariableChange::parser::<LocatedSpan<&'i str>, C>(self.variables).map(into_box),
-        )))
+        let space_or_comment = || {
+            value(
+                (),
+                many0(value((), char('#').and(take_till(|c| c == '\n'))).or(value((), space1))),
+            )
+        };
+        many0(delimited(
+            space_or_comment(),
+            alt((
+                Silence::parser().map(into_box),
+                Marker::parser().map(into_box),
+                Note::parser(self.notes).map(into_box),
+                VariableChange::parser::<LocatedSpan<&'i str>, C>(self.variables).map(into_box),
+            )),
+            space_or_comment(),
+        ))
         .parse_complete(LocatedSpan::new(self.input))
         .finish()
         .map(|(_, o)| o)