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Copy pathlazyre.py
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61 lines (50 loc) · 2.11 KB
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# The MIT License
#
# Copyright (c) 2015 Sebastian Ramacher
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
import functools
import re
class LazyReCompile:
"""Compile regular expressions on first use
This class allows one to store regular expressions and compiles them on
first use."""
def __init__(self, regex, flags=0):
self.regex = regex
self.flags = flags
self.compiled = None
def compile_regex(method):
@functools.wraps(method)
def _impl(self, *args, **kwargs):
if self.compiled is None:
self.compiled = re.compile(self.regex, self.flags)
return method(self, *args, **kwargs)
return _impl
@compile_regex
def finditer(self, *args, **kwargs):
return self.compiled.finditer(*args, **kwargs)
@compile_regex
def search(self, *args, **kwargs):
return self.compiled.search(*args, **kwargs)
@compile_regex
def match(self, *args, **kwargs):
return self.compiled.match(*args, **kwargs)
@compile_regex
def sub(self, *args, **kwargs):
return self.compiled.sub(*args, **kwargs)