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Fix Symbol.__eq__ to return false when comparing with None #1481

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merged 3 commits into from
Oct 26, 2024
Merged

Fix Symbol.__eq__ to return false when comparing with None #1481

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da118c3
Fix Symbol.__eq__ (fixes #1476)
weaversam8 Oct 25, 2024
3ac48c1
Adjust behaviour in #1481 to raise a NotImplementedError
weaversam8 Oct 25, 2024
9d35d1b
Adjust behaviour in #1481 to return NotImplemented
weaversam8 Oct 25, 2024
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3 changes: 2 additions & 1 deletion lark/grammar.py
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Original file line number Diff line number Diff line change
Expand Up @@ -16,7 +16,8 @@ def __init__(self, name: str) -> None:
self.name = name

def __eq__(self, other):
assert isinstance(other, Symbol), other
if not isinstance(other, Symbol):
return NotImplemented
return self.is_term == other.is_term and self.name == other.name

def __ne__(self, other):
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7 changes: 5 additions & 2 deletions tests/test_grammar.py
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Original file line number Diff line number Diff line change
Expand Up @@ -6,7 +6,7 @@
from lark import Lark, Token, Tree, ParseError, UnexpectedInput
from lark.load_grammar import GrammarError, GRAMMAR_ERRORS, find_grammar_errors, list_grammar_imports
from lark.load_grammar import FromPackageLoader

from lark.grammar import Symbol

class TestGrammar(TestCase):
def setUp(self):
Expand Down Expand Up @@ -296,8 +296,11 @@ def test_line_breaks(self):
p.parse('ab')


def test_symbol_eq(self):
a = None
b = Symbol("abc")


self.assertNotEqual(a, b)


if __name__ == '__main__':
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