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Cache SafeRe patterns

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shortcutme 2017-07-15 01:30:35 +02:00
parent d281f112d9
commit 0e930efd95
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1 changed files with 9 additions and 2 deletions
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9
src/util/SafeRe.py
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@ -4,6 +4,8 @@ import re
class UnsafePatternError(Exception):
pass
cached_patterns = {}
def isSafePattern(pattern):
if len(pattern) > 255:
@ -16,5 +18,10 @@ def isSafePattern(pattern):
def match(pattern, *args, **kwargs):
cached_pattern = cached_patterns.get(pattern)
if cached_pattern:
return cached_pattern.match(*args, **kwargs)
else:
if isSafePattern(pattern):
return re.match(pattern, *args, **kwargs)
cached_patterns[pattern] = re.compile(pattern)
return cached_patterns[pattern].match(*args, **kwargs)