def convert(s, syntax=None):
"""Convert a regex regular expression to re syntax.
The first argument is the regular expression, as a string object,
just like it would be passed to regex.compile(). (I.e., pass the
actual string object -- string quotes must already have been
removed and the standard escape processing has already been done,
e.g. by eval().)
The optional second argument is the regex syntax variant to be
used. This is an integer mask as passed to regex.set_syntax();
the flag bits are defined in regex_syntax. When not specified, or
when None is given, the current regex syntax mask (as retrieved by
regex.get_syntax()) is used -- which is 0 by default.
The return value is a regular expression, as a string object that
could be passed to re.compile(). (I.e., no string quotes have
been added -- use quote() below, or repr().)
The conversion is not always guaranteed to be correct. More
syntactical analysis should be performed to detect borderline
cases and decide what to do with them. For example, 'x*?' is not
translated correctly.
"""
table = mastertable.copy()
if syntax is None:
syntax = regex.get_syntax()
if syntax & RE_NO_BK_PARENS:
del table[r'\('], table[r'\)']
del table['('], table[')']
if syntax & RE_NO_BK_VBAR:
del table[r'\|']
del table['|']
if syntax & RE_BK_PLUS_QM:
table['+'] = r'\+'
table['?'] = r'\?'
table[r'\+'] = '+'
table[r'\?'] = '?'
if syntax & RE_NEWLINE_OR:
table['\n'] = '|'
res = ""
i = 0
end = len(s)
while i < end:
c = s[i]
i = i+1
if c == '\\':
c = s[i]
i = i+1
key = '\\' + c
key = table.get(key, key)
res = res + key
else:
c = table.get(c, c)
res = res + c
return res
def compile(pat):
if type(pat) != type(''):
return pat # Assume it is a compiled regex
key = (pat, regex.get_syntax())
if key in cache:
prog = cache[key] # Get it from the cache
else:
prog = cache[key] = regex.compile(pat)
return prog
def compile(pat):
if type(pat) != type(''):
return pat # Assume it is a compiled regex
key = (pat, regex.get_syntax())
if key in cache:
prog = cache[key] # Get it from the cache
else:
prog = cache[key] = regex.compile(pat)
return prog
def compile(pat):
if type(pat) <> type(""):
return pat # Assume it is a compiled regex
key = (pat, regex.get_syntax())
if cache.has_key(key):
prog = cache[key] # Get it from the cache
else:
prog = cache[key] = regex.compile(pat)
return prog
#! /usr/bin/env python1.5
"""Regexp-based split and replace using the obsolete regex module.
"""Regexp-based split and replace using the obsolete regex module.
