fix: handle pattern explanation with no pattern

vberlier · Jul 22, 2021 · 1de098b · 1de098b
1 parent d530760
commit 1de098b
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/tokenstream/token.py b/tokenstream/token.py
@@ -17,6 +17,8 @@ def explain_patterns(patterns: Sequence[TokenPattern]) -> str:
         pattern if isinstance(pattern, str) else f"{pattern[0]} {pattern[1]!r}"
         for pattern in patterns
     ]
+    if not token_types:
+        return "nothing"
     if len(token_types) == 1:
         return token_types[0]
     *head, before_last, last = token_types