From 17a9053286ac251546dca6cf475d0e9843cf9cc5 Mon Sep 17 00:00:00 2001
From: Astatin <git@astatin.live>
Date: Thu, 29 Aug 2024 16:23:53 +0900
Subject: Add errors on label already exists

---
 gbasm | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/gbasm b/gbasm
index 28b4f2f..2b01a3e 100755
--- a/gbasm
+++ b/gbasm
@@ -372,7 +372,10 @@ def preprocess(input_file, offset):
         
         if ':' in line_without_comment:
             splitted = line_without_comment.split(':')
-            labels[splitted[0].strip().upper()] = starting_address
+            labelName = splitted[0].strip().upper()
+            if labelName in labels:
+                raise ValueError("Label \"{}\" is already defined".format(labelName))
+            labels[labelName] = starting_address
             line_without_comment = splitted[1].strip()
 
         if line_without_comment != '':
-- 
cgit v1.2.3-70-g09d2