# 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 re class LazyReCompile(object): """Compile regular expressions on first use This class allows 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): 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)