rebel-parse: recipe: allow negative integer literals

Parsing a number as a negative literal instead of a positive number with
negation fixes parsing of i64::MIN. The rule is only used for this
specific case though, as the unary_op + number rule will succeed first
otherwise.

1 files changed, 5 insertions, 2 deletions

diff --git a/crates/rebel-parse/src/grammar/recipe.rs b/crates/rebel-parse/src/grammar/recipe.rs
index 2d342ad..5f6adbc 100644
--- a/crates/rebel-parse/src/grammar/recipe.rs
+++ b/crates/rebel-parse/src/grammar/recipe.rs
@@ -198,7 +198,7 @@ peg::parser! {
 			}
 
 		rule number() -> i64
-			= [Token::Number(s)] { ?
+			= neg:p('-')? [Token::Number(s)] { ?
 				let (radix, rest) = if let Some(rest) = s.strip_prefix("0x") {
 					(16, rest)
 				} else if let Some(rest) = s.strip_prefix("0o") {
@@ -208,7 +208,10 @@ peg::parser! {
 				} else {
 					(10, *s)
 				};
-				let digits = rest.replace('_', "");
+				let mut digits = rest.replace('_', "");
+				if neg.is_some() {
+					digits = format!("-{digits}");
+				}
 				i64::from_str_radix(&digits, radix).or(Err("number"))
 			}