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bpo-31671: re: Convert RegexFlag to int before compile (GH-3862)

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sre_compile does bit test (e.g. `flags & SRE_FLAG_IGNORECASE`) in loop.
`IntFlag.__and__` and `IntFlag.__new__` made it slower.

So this commit convert it to normal int before passing flags to `sre_compile()`.
This commit is contained in:
INADA Naoki 2017-10-05 17:19:26 +09:00 • committed by GitHub
parent af810b35b4
commit c1c47c166b
3 changed files with 11 additions and 0 deletions
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4
Lib/re.py
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@ -275,6 +275,8 @@ _cache = OrderedDict()
_MAXCACHE = 512
def _compile(pattern, flags):
# internal: compile pattern
if isinstance(flags, RegexFlag):
flags = flags.value
try:
return _cache[type(pattern), pattern, flags]
except KeyError:
@ -331,6 +333,8 @@ copyreg.pickle(Pattern, _pickle, _compile)
class Scanner:
def __init__(self, lexicon, flags=0):
from sre_constants import BRANCH, SUBPATTERN
if isinstance(flags, RegexFlag):
flags = flags.value
self.lexicon = lexicon
# combine phrases into a compound pattern
p = []