remove WrapperType enum to ease parsing

src/bng/score.rs

@@ -10,8 +10,10 @@ pub(super) enum Atom {
     StartHere,
     Modifier(Modifier),
     QuickModifier(QuickModifier),
-    Wrapper(WrapperKind, Vec<Atom>),
+    Loop(u8, Vec<Atom>),
-    EmptyWrapper(WrapperKind),
+    Tuple(Vec<Atom>),
+    Slope(SlopeModifier, Instruction, Vec<Atom>),
+    Comment,
 }
 
 #[derive(ModifierParser)]
@@ -30,13 +32,6 @@ pub(super) enum QuickModifier {
     Pizz(bool),
 }
 
-pub(super) enum WrapperKind {
-    Loop(u8),
-    Tuple,
-    Slope(SlopeModifier, Instruction),
-    Comment,
-}
-
 #[derive(Clone, Copy, SlopeModifierParser)]
 pub(super) enum SlopeModifier {
     Note,

src/bng/score/lex.rs

@@ -1,4 +1,4 @@
-use super::{Atom, Modifier, QuickModifier, SlopeModifier, WrapperKind};
+use super::{Atom, Modifier, QuickModifier, SlopeModifier};
 
 pub(super) mod lexer;
 
@@ -23,17 +23,6 @@ pub(super) trait Token<T> {
     fn token(self) -> T;
 }
 
-impl Token<(char, char)> for WrapperKind {
-    fn token(self) -> (char, char) {
-        match self {
-            Self::Loop(_) => WrappingTokens::PARENTHESES,
-            Self::Tuple => WrappingTokens::SQUARE_BRACKETS,
-            Self::Slope(_, _) => WrappingTokens::BRACKETS,
-            WrapperKind::Comment => WrappingTokens::SEMICOLON_COMMA,
-        }
-    }
-}
-
 impl Token<(char, char)> for QuickModifier {
     fn token(self) -> (char, char) {
         match self {

src/bng/score/lex/lexer.rs

@@ -1,7 +1,11 @@
-use nom::{branch::alt, character::complete::char, combinator::value, IResult, Parser};
+use nom::{
+    branch::alt, character::complete::char, combinator::value, sequence::delimited, IResult, Parser,
+};
 
 use crate::bng::score::QuickModifier;
 
+use super::Token;
+
 pub(crate) trait Parse: Sized {
     fn parse(input: &str) -> IResult<&str, Self>;
 }