bpo-30285: Optimize case-insensitive matching and searching#1482
Merged
serhiy-storchaka merged 6 commits intopython:masterfrom May 9, 2017
Merged
bpo-30285: Optimize case-insensitive matching and searching#1482serhiy-storchaka merged 6 commits intopython:masterfrom
serhiy-storchaka merged 6 commits intopython:masterfrom
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of regular expressions.
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@serhiy-storchaka, thanks for your PR! By analyzing the history of the files in this pull request, we identified @rhettinger, @Yhg1s and @niemeyer to be potential reviewers. |
rhettinger
reviewed
May 6, 2017
Lib/sre_compile.py
Outdated
| charmap[av] = 1 | ||
| elif op is RANGE: | ||
| r = range(av[0], av[1]+1) | ||
| r = r0 = range(av[0], av[1]+1) |
Member
Author
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At line 296.
if fixup and not hascased:
hascased = any(map(iscased, r0))
This intentionally moved after the loops that set bits in charmap because for large ranges like range(0x20000, 0x110000) it is better to get an IndexError earlier (the size of charmap is 0x100 or 0x10000) than burn CPU in long useless loop.
lisroach
reviewed
May 7, 2017
Lib/sre_compile.py
Outdated
| charmap = bytearray(256) | ||
| hascased = False | ||
| if fixup: | ||
| if flags & SRE_FLAG_UNICODE and not flags & SRE_FLAG_ASCII: |
Contributor
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Can the if/else statement from 264-267 be replaced with:
iscased = _get_iscased(flags)
?
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of regular expressions.