From daa1c63112bfea28613026b408eb412d9518bb9a Mon Sep 17 00:00:00 2001
From: Daniel Swanson <awesomeevildudes@gmail.com>
Date: Sat, 20 Jul 2024 09:39:44 -0400
Subject: [PATCH] substr before calling stoi (closes #99)

---
 src/pattern.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/pattern.cc b/src/pattern.cc
index 441df57..d2a919d 100644
--- a/src/pattern.cc
+++ b/src/pattern.cc
@@ -468,7 +468,8 @@ PatternBuilder::write(FILE* output, int longest, vector<pair<int, UString>> inpu
       if(s.compare(0, rule_sym_pre.size(), rule_sym_pre) != 0) {
         continue;
       }
-      const int rule_num = StringUtils::stoi(s.substr(rule_sym_pre.size()));
+      size_t pos = rule_sym_pre.size();
+      const int rule_num = StringUtils::stoi(s.substr(pos, s.size()-pos-1));
       transducer.setFinal(src);
       finals_rules.insert(make_pair(src, make_pair(rule_num, wgt)));
     }