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#!/usr/bin/env python
#############################################################################
##
# This file is part of Taurus
##
# http://taurus-scada.org
##
# Copyright 2011 CELLS / ALBA Synchrotron, Bellaterra, Spain
##
# Taurus is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
##
# Taurus is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Lesser General Public License for more details.
##
# You should have received a copy of the GNU Lesser General Public License
# along with Taurus. If not, see <http://www.gnu.org/licenses/>.
##
#############################################################################
"""
Provides a decorator to decorate decorators so that they can be used both
with and without args
"""
__all__ = ["decorator"]
__docformat__ = "restructuredtext"
import functools
import inspect
def decorator(func):
"""
Allow to use decorator either with arguments or not. Example::
@decorator
def apply(func, *args, **kw):
return func(*args, **kw)
@decorator
class apply:
def __init__(self, *args, **kw):
self.args = args
self.kw = kw
def __call__(self, func):
return func(*self.args, **self.kw)
#
# Usage in both cases:
#
@apply
def test():
return 'test'
assert test == 'test'
@apply(2, 3)
def test(a, b):
return a + b
assert test == 5
"""
def isFuncArg(*args, **kw):
return len(args) == 1 and len(kw) == 0 and (
inspect.isfunction(args[0]) or isinstance(args[0], type))
if isinstance(func, type):
def class_wrapper(*args, **kw):
if isFuncArg(*args, **kw):
return func()(*args, **kw) # create class before usage
return func(*args, **kw)
class_wrapper.__name__ = func.__name__
class_wrapper.__module__ = func.__module__
return class_wrapper
@functools.wraps(func)
def func_wrapper(*args, **kw):
if isFuncArg(*args, **kw):
return func(*args, **kw)
def functor(userFunc):
return func(userFunc, *args, **kw)
return functor
return func_wrapper
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