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Use MAXWIDTH instead of MAXREPEAT when available #1377

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merged 2 commits into from
Dec 7, 2023
Merged

Use MAXWIDTH instead of MAXREPEAT when available #1377

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e4dbb4f
Use MAXWIDTH instead of MAXREPEAT when available
MegaIng Dec 7, 2023
b31ef8f
MAXWIDTH is not part of sre_constants
MegaIng Dec 7, 2023
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7 changes: 5 additions & 2 deletions lark/utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -149,11 +149,14 @@ def get_regexp_width(expr: str) -> Union[Tuple[int, int], List[int]]:
# sre_parse does not support the new features in regex. To not completely fail in that case,
# we manually test for the most important info (whether the empty string is matched)
c = regex.compile(regexp_final)
# Python 3.11.7 introducded sre_parse.MAXWIDTH that is used instead of MAXREPEAT
# See lark-parser/lark#1376 and python/cpython#109859
MAXWIDTH = getattr(sre_parse, "MAXWIDTH", sre_constants.MAXREPEAT)
if c.match('') is None:
# MAXREPEAT is a none pickable subclass of int, therefore needs to be converted to enable caching
return 1, int(sre_constants.MAXREPEAT)
return 1, int(MAXWIDTH)
else:
return 0, int(sre_constants.MAXREPEAT)
return 0, int(MAXWIDTH)

###}

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