Add an error message when using Lark.save() when parser!='lalr' (#1328)

lark-parser · Aug 23, 2023 · fbe6f4c · fbe6f4c
1 parent 656334c
commit fbe6f4c
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/lark/lark.py b/lark/lark.py
@@ -494,6 +494,8 @@ def save(self, f, exclude_options: Collection[str] = ()) -> None:
 
         Useful for caching and multiprocessing.
         """
+        if self.options.parser != 'lalr':
+            raise NotImplementedError("Lark.save() is only implemented for the LALR(1) parser.")
         data, m = self.memo_serialize([TerminalDef, Rule])
         if exclude_options:
             data["options"] = {n: v for n, v in data["options"].items() if n not in exclude_options}