From 81b7e84097e4f9c11ceb8dac9f2aad49fd0ce705 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jan=20Christian=20Gr=C3=BCnhage?=
 <jan.christian@gruenhage.xyz>
Date: Sat, 18 Dec 2021 12:54:51 +0100
Subject: [PATCH] support parsing negative numbers

---
 src/parsing.rs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/parsing.rs b/src/parsing.rs
index 0273a46..3827d52 100644
--- a/src/parsing.rs
+++ b/src/parsing.rs
@@ -24,6 +24,10 @@ pub fn parse_number_with_radix<T: Num>(
 ) -> Option<T> {
     tokens.skip_tokens_while(|t| *t == ' ');
     let mut remaining = limit.map(|x| x as isize).unwrap_or(isize::MAX);
+    let mut prefix = String::new();
+    if tokens.token('-') {
+        prefix.push('-');
+    }
     let digits: String = tokens
         .tokens_while(|c| {
             remaining -= 1;
@@ -31,7 +35,7 @@ pub fn parse_number_with_radix<T: Num>(
         })
         .collect();
     (!digits.is_empty())
-        .then(|| T::from_str_radix(&digits, base).ok())
+        .then(|| T::from_str_radix(&format!("{}{}", prefix, digits), base).ok())
         .flatten()
 }