Source code for lib.Decorators

# EMACS settings: -*-	tab-width: 2; indent-tabs-mode: t; python-indent-offset: 2 -*-
# vim: tabstop=2:shiftwidth=2:noexpandtab
# kate: tab-width 2; replace-tabs off; indent-width 2;
#
# ==============================================================================
# Authors:            Patrick Lehmann
#
# Python functions:    Auxillary functions to exit a program and report an error message.
#
# License:
# ==============================================================================
# Copyright 2017-2018 Patrick Lehmann - Bötzingen, Germany
# Copyright 2007-2016 Technische Universität Dresden - Germany
#                     Chair of VLSI-Design, Diagnostics and Architecture
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ==============================================================================
#
# load dependencies
import functools

from lib.SphinxExtensions import DocumentMemberAttribute


__api__ = [
	'MethodAlias',
	'ILazyLoadable',
	'LazyLoadTrigger',
	'CachedReadOnlyProperty'
]
__all__ = __api__


[docs]class MethodAlias: """``MethodAlias`` creates a local method, which is an alias to another method local or inherited method. """
[docs] @DocumentMemberAttribute() def __init__(self, method): self.method = method
[docs] @DocumentMemberAttribute() def __call__(self, func): return self.method
[docs]class ILazyLoadable: def __init__(self): self.__IsLoaded = False
[docs] def _LazyLoadable_Load(self): self.__IsLoaded = True
@property def LazyLoadable_IsLoaded(self): return self.__IsLoaded
[docs]class LazyLoadTrigger: def __init__(self, func): self.func = func def __call__(self, inst, *args, **kwargs): if (inst.LazyLoadable_IsLoaded is False): inst._LazyLoadable_Load() return self.func(inst, *args, **kwargs) def __repr__(self): return self.func.__doc__
[docs]class CachedReadOnlyProperty: def __init__(self, func): self.func = func self.__cache = None def __call__(self, *args): if self.__cache is None: result = self.func(*args) self.__cache = result return self.__cache def __repr__(self): return self.func.__doc__ def __get__(self, obj, _): functools.partial(self.__call__, obj)
# def property(function): # import sys # import builtins # # keys = 'fget', 'fset', 'fdel' # func_locals = {'doc' : function.__doc__} # def probe_func(frame, event, arg): # if event == 'return': # locals = frame.f_locals # func_locals.update(dict((k, locals.get(k)) for k in keys)) # sys.settrace(None) # return probe_func # sys.settrace(probe_func) # function() # return builtins.property(**func_locals)