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Bugfix: issue when unpickling in the standalone parser, due to lingering Token instances #1553

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Merged
erezsh merged 1 commit into from
Sep 7, 2025
Merged

Bugfix: issue when unpickling in the standalone parser, due to lingering Token instances #1553

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7 changes: 6 additions & 1 deletion lark/grammar.py
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
from typing import Optional, Tuple, ClassVar, Sequence
from typing import Any, Dict, Optional, Tuple, ClassVar, Sequence

from .utils import Serialize

Expand Down Expand Up @@ -57,6 +57,11 @@ class NonTerminal(Symbol):

is_term: ClassVar[bool] = False

def serialize(self, memo=None) -> Dict[str, Any]:
# TODO this is here because self.name can be a Token instance.
# remove this function when the issue is fixed. (backwards-incompatible)
return {'name': str(self.name), '__type__': 'NonTerminal'}


class RuleOptions(Serialize):
__serialize_fields__ = 'keep_all_tokens', 'expand1', 'priority', 'template_source', 'empty_indices'
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