From 304a360608947e04f8d20caf017cafef9b51c08a Mon Sep 17 00:00:00 2001
From: p6nj <breee@duck.com>
Date: Thu, 7 Nov 2024 21:12:27 -0500
Subject: [PATCH] avoid parsing if string is empty

---
 src/bng/score.rs    |  2 +-
 src/bng/score/de.rs | 10 +++++++---
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/src/bng/score.rs b/src/bng/score.rs
index 4aadc1e..84ba46c 100644
--- a/src/bng/score.rs
+++ b/src/bng/score.rs
@@ -33,7 +33,7 @@ pub use de::*;
 
 use super::Expression as Instruction;
 
-#[derive(Deref, From)]
+#[derive(Deref, From, Default)]
 #[cfg_attr(debug_assertions, derive(Serialize, Debug))]
 pub struct Atoms(Vec<Atom>);
 
diff --git a/src/bng/score/de.rs b/src/bng/score/de.rs
index 1745d76..e9c16a0 100644
--- a/src/bng/score/de.rs
+++ b/src/bng/score/de.rs
@@ -2,7 +2,7 @@ use derive_new::new;
 use nom::{
     character::complete::one_of,
     combinator::all_consuming,
-    multi::many0,
+    multi::{many0, many1},
     sequence::{preceded, terminated},
     Parser,
 };
@@ -108,7 +108,11 @@ impl<'de> Deserialize<'de> for Atoms {
         const FIELDS: &[&str] = &["notes", "sheet"];
         let NotesSheet { notes, sheet } =
             deserializer.deserialize_struct("NotesSheet", FIELDS, NotesSheetVisitor)?;
-        flat_atom_parser_mapper::<D, _>(&sheet, flat_atom_parser(&notes))
+        if sheet.is_empty() {
+            Ok(Default::default())
+        } else {
+            flat_atom_parser_mapper::<D, _>(&sheet, flat_atom_parser(&notes))
+        }
     }
 }
 
@@ -128,7 +132,7 @@ where
     P: Parser<&'a str, FlatAtom, nom::error::Error<&'a str>>,
 {
     all_consuming(terminated(
-        many0(preceded(maybe_yml_str_space(), parser)),
+        many1(preceded(maybe_yml_str_space(), parser)),
         maybe_yml_str_space(),
     ))(input)
     .map_err(nom_err_message)