def __init__(self):
for signal in self.__signals__.values():
ctl = signal.default_control(self)
setattr(self, "_%s_ctl" % pyname(signal.name), ctl)
if not isinstance(signal, DelegateSignal):
setattr(self, "_%s_book" % pyname(signal.name), ctl._runner)
# Registra os métodos criados pelo mecanismo on_signal...
auto_method = getattr(self, "on_" + pyname(signal.name), None)
if auto_method is not None:
kwargs = {"owner": self}
if signal._num_filters == 0:
self.listen(signal.name, auto_method, **kwargs)
else:
args = (None,) * signal._num_filters
args += (auto_method,)
self.listen(signal.name, *args, **kwargs)
# Registra os métodos criados pelo mecanismo @listen
marked_listen = self.__marked_listen__.get(signal.name, [])
for (func_name, args, kwargs) in marked_listen:
handler = getattr(self, func_name)
filters = args[: signal._num_filters] or (None,) * signal._num_filters
args = args[signal._num_filters :]
args = filters + (handler,) + args
kwargs = kwargs.copy()
kwargs["owner"] = self
self.listen(signal.name, *args, **kwargs)
def new_signal(self, name, *filters, **kwds):
'''Cria um novo sinal para o evento global.
Possui uma assinatura variável onde o tipo de sinal é escolhido
automaticamente a partir dos argumentos
signal('foo', num_args=1)
Sinal simples chamado 'foo' com apenas 1 argumento.
signal('foo', 'bar')
Sinal filtrado chamado 'foo' que requer um argumento extra 'bar'
signal('foo', delegate_to=obj)
Delega sinal 'foo' para o objeto fornecido em *delegate_to*
'''
cls = type(self)
attr = pyname(name)
# Organiza delegações e salva delegado em atributo
if 'delegate_to' in kwds:
delegate_obj = kwds['delegate_to']
try:
delegate_attr = self._delegates[id(delegate_obj)]
except KeyError:
delegate_attr = '_delegate_%s' % self._delegate_idx
self._delegates[id(delegate_obj)] = delegate_attr
self._delegate_idx += 1
setattr(self, delegate_attr, delegate_obj)
kwds['delegate_to'] = delegate_attr
# Cria sinal
signal_obj = signal(name, *filters, **kwds)
if name in cls.__signals__:
raise ValueError('global signal already exists: %r' % name)
cls.__signals__[attr] = signal_obj
setattr(cls, pyname(name), signal_obj)
# Cria os métodos do tipo listen_<> e tipo trigger_<>
lname = 'listen_' + attr
tname = 'trigger_' + attr
listen_method = signal_obj._factory_listen_method()
trigger_method = signal_obj._factory_trigger_method()
setattr(cls, lname, listen_method)
setattr(cls, tname, trigger_method)
# Inicializa SignalCtl
ctl = signal_obj.default_control()
setattr(self, '_%s_ctl' % attr, ctl)
if not isinstance(signal, DelegateSignal):
setattr(self, '_%s_book' % attr, ctl._runner)
def _factory_trigger_method(self):
signal = self # não confundir com o self da função fabricada!
attr_name = pyname('_%s_book' % signal.name)
# Especializamos para 0, 1 ou 2 argumentos por questões de performance
if signal.num_args == 0:
def trigger_method(self, key):
book = getattr(self, attr_name)
kbook = book.get(key, None)
if kbook is not None:
for wrapped_func in kbook:
wrapped_func()
else:
gen_book = book.get(None, None)
if gen_book is not None:
for func in gen_book:
func(key)
elif signal.num_args == 1:
def trigger_method(self, key, arg):
book = getattr(self, attr_name)
kbook = book.get(key, None)
if kbook is not None:
for wrapped_func in kbook:
wrapped_func(arg)
else:
gen_book = book.get(None, None)
if gen_book is not None:
for func in gen_book:
func(key, arg)
else:
def trigger_method(self, key, *args):
if len(args) != signal.num_args:
raise TypeError('expected %s arguments' % self.num_args)
book = getattr(self, attr_name)
kbook = book.get(key, None)
if kbook is not None:
for wrapped_func in kbook:
wrapped_func(*args)
else:
gen_book = book.get(None, None)
if gen_book is not None:
for func in gen_book:
func(key, *args)
trigger_method.__name__ = 'trigger_' + pyname(signal.name)
# trigger_method.__doc__ = (trigger_method.__doc__
# % {'signal': signal.name})
return trigger_method
def _populate_namespace(cls, name, bases, ns):
"""Retorna o namespace ns acrescentado dos métodos trigger_* e
listen_* apropriados para a classe em questão"""
ns = dict(ns)
# Lê os sinais e monta um dicionário de sinais
signals = {}
for C in reversed(bases):
signals.update(getattr(C, "__signals__", {}))
for attr, value in ns.items():
if isinstance(value, Signal):
signals[attr] = value
ns["__signals__"] = signals
# Cria os métodos do tipo listen_* e tipo trigger_*
for signal in signals.values():
lname = "listen_" + pyname(signal.name)
tname = "trigger_" + pyname(signal.name)
ns["_" + lname] = signal._factory_listen_method()
if lname not in ns:
ns[lname] = ns["_" + lname]
ns["_" + tname] = signal._factory_trigger_method()
if tname not in ns:
ns[tname] = ns["_" + tname]
# Escaneia todos os métodos decorados com @listen
listen = {}
for C in reversed(bases):
listen.update(getattr(C, "__marked_listen__", {}))
for attr, value in ns.items():
if hasattr(value, "_listen_args"):
for name, args, kwds in getattr(value, "_listen_args"):
L = listen.setdefault(name, [])
L.append((attr, args, kwds))
ns["__marked_listen__"] = listen
# Atribui valores de slots, caso necessário
if "__slots__" in ns:
slots = list(ns["__slots__"])
for signal_name, signal in signals.items():
if not isinstance(signal, DelegateSignal):
slots.append("_%s_ctl" % signal_name)
slots.append("_%s_book" % signal_name)
ns["__slots__"] = slots
return ns
def _factory_trigger_method(self):
signal = self # não confundir com o self da função fabricada!
attr_name = pyname('_%s_book' % signal.name)
# Especializamos para 0, 1 ou 2 argumentos por questões de performance
if signal.num_args == 0:
def trigger_method(self):
book = getattr(self, attr_name)
for wrapped_func in book:
wrapped_func()
elif signal.num_args == 1:
def trigger_method(self, arg):
book = getattr(self, attr_name)
for wrapped_func in book:
wrapped_func(arg)
elif signal.num_args == 2:
def trigger_method(self, arg1, arg2):
book = getattr(self, attr_name)
for wrapped_func in book:
wrapped_func(arg1, arg2)
else:
def trigger_method(self, *args):
if len(args) != signal.num_args:
raise TypeError('expected %s arguments' % self.num_args)
book = getattr(self, attr_name)
for wrapped_func in book:
wrapped_func(*args)
trigger_method.__name__ = 'trigger_' + pyname(signal.name)
# trigger_method.__doc__ = trigger_method.__doc__ % \
# {'signal': signal.name}
return trigger_method
def listen(self, signal, *args, **kwds):
"""Registra um handler para um determinado sinal.
A assinatura correta para esta função depende do tipo de sinal
considerado. Para sinais simples, basta utilizar::
obj.listen(<nome do sinal>, <handler>)
Sinais filtrados (aqueles que pedem um ou mais argumentos adicionais),
devem ser registrados como::
obj.listen(<nome do sinal>, <filtro>, <handler>)
Opcionalmente, é possível acrescentar argumentos por nome ou posição
que serão passados automaticamente para o handler quando o sinal for
acionado.
"""
implementation = getattr(self, "listen_" + pyname(signal))
return implementation(*args, **kwds)
def listen_method(self, *args, **kwargs):
'''vsds %(signal)s'''
# Confere argumentos de entrada
args_ = kwargs.pop('args', None)
kwargs_ = kwargs.pop('kwargs', None)
owner = kwargs.pop('owner', None)
if args_:
args = args_
if kwargs_:
kwargs = kwargs_
# Extrai os filtros, caso necessário
filter_args = args[:signal._num_filters]
try:
handler = args[signal._num_filters]
except IndexError:
handler = None
args = args[signal._num_filters + 1:]
if args_ is not None and args:
raise TypeError('cannot specify the args parameter and also '
'insert positional arguments')
if kwargs_ is not None and kwargs:
raise TypeError('cannot specify the kwargs parameter and also '
'insert keyword arguments')
# Caso handler=None, estamos chamando o método listen na versão
# de decorador
if handler is None:
def decorator(func):
args_ = filter_args + (func,)
kwargs_ = {'args': args, 'kwargs': kwargs, 'owner': owner}
return listen_method(self, *args_, **kwargs_)
return decorator
# Registra nas listas de controle
wrapped = wrap_handler(
handler, args, kwargs, pre_args=signal.num_args)
ctl = getattr(self, '_%s_ctl' % pyname(signal.name))
if signal._num_filters == 0:
idx = len(ctl._data)
elem = ControlElem(idx, owner, wrapped, handler, args, kwargs)
ctl._runner.append(wrapped)
ctl._data.append(elem)
return idx
elif signal._num_filters == 1:
key = filter_args[0]
ids = {}
if key is None:
# Registra como handler de todas os filtros no livro
for k in ctl._runner:
if k is None:
continue
wrapped_i = wrap_handler(handler, (k,) + args, kwargs,
pre_args=signal.num_args)
ids[k] = listen_method(self, k, wrapped_i)
# Cria um elemento de controle substituindo o campo
# "wrapped" pelo dicionário das ids em cada filtro
control = ctl._data.setdefault(None, [])
book = ctl._runner.setdefault(None, [])
idx = len(control)
elem = ControlElem(idx, owner, ids, handler, args, kwargs)
control.append(elem)
book.append(
wrap_handler(
handler, args, kwargs, pre_args=signal.num_args))
return (None, idx)
else:
try:
idx = len(ctl._data[key])
except KeyError:
ctl._data[key] = []
ctl._runner[key] = []
for ctl_e in ctl._data.get(None, []):
wrapped_i = wrap_handler(
ctl_e.handler, (key,) + ctl_e.args,
ctl_e.kwargs, signal.num_args)
ctl_e.wrapped[key] = listen_method(
self, key, wrapped_i)
idx = len(ctl._data[key])
elem = ControlElem(
idx, owner, wrapped, handler, args, kwargs)
ctl._runner[key].append(wrapped)
ctl._data[key].append(elem)
return key, idx
else:
book = ctl._runner[filter_args]
control = ctl._data[filter_args]
raise RuntimeError
def __init__(self, name, num_args=0):
self.name = name
self.num_args = num_args
self._num_filters = 0
self._ctl_name = '_%s_ctl' % pyname(self.name)
def trigger(self, signal, *args, **kwds):
"""Aciona o sinal com os argumentos fornecidos."""
implementation = getattr(self, "trigger_" + pyname(signal))
return implementation(*args, **kwds)
