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"""Generic programming utilities.
Utilities implemented in this file are not dependent
on dbus, they can be used everywhere.
"""
class subscription(object):
__slots__ = ("callback_list", "callback")
def __init__(self, callback_list, callback):
self.callback_list = callback_list
self.callback = callback
self.callback_list.append(callback)
def unsubscribe(self):
self.callback_list.remove(self.callback)
self.callback_list = None
self.callback = None
def disconnect(self):
"""An alias for unsubscribe()"""
self.unsubscribe()
def __enter__(self):
return self
def __exit__(self, exc_type, exc_value, traceback):
if not self.callback is None:
self.unsubscribe()
class bound_signal(object):
__slots__ = ("__signal__", "__self__") # bound method uses ("__func__", "__self__")
def __init__(self, signal, instance):
self.__signal__ = signal
self.__self__ = instance
@property
def callbacks(self):
return self.__signal__.map[self.__self__]
def connect(self, callback):
"""Subscribe to the signal."""
return self.__signal__.connect(self.__self__, callback)
def emit(self, *args):
"""Emit the signal."""
self.__signal__.emit(self.__self__, *args)
def __call__(self, *args):
"""Emit the signal."""
self.emit(*args)
def __repr__(self):
return "<bound signal " + self.__signal__.__qualname__ + " of " + repr(self.__self__) + ">"
class signal(object):
"""Static signal object
You're expected to set it as a class property::
class A:
SomethingHappened = signal()
Declared this way, it can be used on class instances
to connect signal observers::
a = A()
a.SomethingHappened.connect(func)
and emit the signal::
a.SomethingHappened()
You may pass any parameters to the emiting function
- they will be forwarded to all subscribed callbacks.
"""
def __init__(self):
self.map = {}
self.__qualname__ = "<anonymous signal>" # function uses <lambda> ;)
self.__doc__ = "Signal."
def connect(self, object, callback):
"""Subscribe to the signal."""
return subscription(self.map.setdefault(object, []), callback)
def emit(self, object, *args):
"""Emit the signal."""
for cb in self.map.get(object, []):
cb(*args)
def __get__(self, instance, owner):
if instance is None:
return self
return bound_signal(self, instance)
def __set__(self, instance, value):
raise AttributeError("can't set attribute")
def __repr__(self):
return "<signal " + self.__qualname__ + " at 0x" + format(id(self), "x") + ">"
bound_method = type(signal().emit) # TODO find a prettier way to get this type