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Better error in Lark.parse when using on_error when parser!=lalr (issue #1311) #1460

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Sep 1, 2024
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Better error in Lark.parse when using on_error when parser!=lalr (issue #1311) #1460

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2 changes: 2 additions & 0 deletions lark/lark.py
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Original file line number Diff line number Diff line change
Expand Up @@ -652,6 +652,8 @@ def parse(self, text: str, start: Optional[str]=None, on_error: 'Optional[Callab
For convenience, these sub-exceptions also inherit from ``ParserError`` and ``LexerError``.

"""
if on_error is not None and self.options.parser != 'lalr':
raise NotImplementedError("The on_error option is only implemented for the LALR(1) parser.")
return self.parser.parse(text, start=start, on_error=on_error)


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5 changes: 5 additions & 0 deletions tests/test_parser.py
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Expand Up @@ -2584,6 +2584,11 @@ def ignore_errors(e):
s = "[0 1, 2,@, 3,,, 4, 5 6 ]$"
tree = g.parse(s, on_error=ignore_errors)

@unittest.skipIf(PARSER == 'lalr', "test on_error only works with lalr")
def test_on_error_without_lalr(self):
p = _Lark(r"""start: "A" """)
self.assertRaises(NotImplementedError, p.parse, "", on_error=print)

@unittest.skipIf(PARSER != 'lalr', "interactive_parser error handling only works with LALR for now")
def test_iter_parse(self):
ab_grammar = '!start: "a"* "b"*'
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