From a4c59b67e8280ee59362f9ac71feb4c658718e6f Mon Sep 17 00:00:00 2001
From: David Rose <david@ddrose.com>
Date: Wed, 27 Jun 2001 19:26:58 +0000
Subject: [PATCH] don't allow leading digits in group names

---
 pandatool/src/xfile/xFileMaker.cxx | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/pandatool/src/xfile/xFileMaker.cxx b/pandatool/src/xfile/xFileMaker.cxx
index 11d7cd0bc1..e345787d7f 100644
--- a/pandatool/src/xfile/xFileMaker.cxx
+++ b/pandatool/src/xfile/xFileMaker.cxx
@@ -437,6 +437,12 @@ make_nice_name(const string &str) {
     }
   }
 
+  if (!str.empty() && isdigit(str[0])) {
+    // If the name begins with a digit, we must make it begin with
+    // something else, like for instance an underscore.
+    result = '_' + result;
+  }
+
   return result;
 }