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Store the current regex syntax along with the regular expression

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string as the key to the cache.  This means that changing the syntax
will return the correct compiled pattern.

clear_cache(): New function.
This commit is contained in:
Barry Warsaw 1997-02-18 18:52:55 +00:00
parent 909d7c3284
commit b67a25c079
1 changed files with 15 additions and 10 deletions
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25
Lib/regsub.py
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@ -109,27 +109,32 @@ def capwords(str, pat='[^a-zA-Z0-9_]+'):
# Manage a cache of compiled regular expressions.
# If the pattern is a string a compiled version of it is returned.
# If the pattern has been used before we return an already compiled
#
# If the pattern is a string a compiled version of it is returned. If
# the pattern has been used before we return an already compiled
# version from the cache; otherwise we compile it now and save the
# compiled version in the cache.
# Instead of a string, a compiled regular expression can also be
# passed.
# WARNING: if the pattern syntax is changed, the cache should be
# flushed!
# compiled version in the cache, along with the syntax it was compiled
# with. Instead of a string, a compiled regular expression can also
# be passed.
cache = {}
def compile(pat):
if type(pat) <> type(''):
return pat # Assume it is a compiled regex
if cache.has_key(pat):
prog = cache[pat] # Get it from the cache
key = (pat, regex.get_syntax())
if cache.has_key(key):
prog = cache[key] # Get it from the cache
else:
prog = cache[pat] = regex.compile(pat)
prog = cache[key] = regex.compile(pat)
return prog
def clear_cache():
global cache
cache = {}
# Expand \digit in the replacement.
# Each occurrence of \digit is replaced by the substring of str
# indicated by regs[digit]. To include a literal \ in the