class Condition:
def __init__(self, pf):
if issubclass(pf.__class__, Condition):
self._pollFunc = pf._pollFunc
self.status = pf.status
self.changed = pf.changed
else:
self._pollFunc = pf
self.status = self._pollFunc()
self.changed = Event()
def poll(self):
oldStatus = self.status
self.status = self._pollFunc()
if self.status != oldStatus:
self.changed.trigger(self.status)
def parentChanged(self, newStatus):
self.poll()
def getStatus(self):
return self.status
def __invert__(self):
nc = Condition(lambda: not self.status)
self.changed.addResponder(nc.parentChanged)
return nc
def __and__(self, other):
nc = Condition(lambda: self.status and other.status)
self.changed.addResponder(nc.parentChanged)
other.changed.addResponder(nc.parentChanged)
return nc
def __or__(self, other):
nc = Condition(lambda: self.status or other.status)
self.changed.addResponder(nc.parentChanged)
other.changed.addResponder(nc.parentChanged)
return nc
