Fix an issue with negative indexes causing IndexError in some cases.

andialbrecht · Sep 30, 2020 · 10231d8 · 10231d8
1 parent d7b1ee3
commit 10231d8
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/sqlparse/engine/grouping.py b/sqlparse/engine/grouping.py
@@ -432,6 +432,8 @@ def _group(tlist, cls, match,
     pidx, prev_ = None, None
     for idx, token in enumerate(list(tlist)):
         tidx = idx - tidx_offset
+        if tidx < 0:  # tidx shouldn't get negative
+            continue
 
         if token.is_whitespace:
             continue