2020-03-23 22:56:05 +00:00
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from abc import ABC, abstractmethod
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2020-03-21 21:40:39 +00:00
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import logging
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logger = logging.getLogger(__name__)
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class Subscription(object):
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2020-03-23 22:56:05 +00:00
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def __init__(self, subscriptee, name, subscriber):
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self.subscriptee = subscriptee
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self.name = name
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2020-03-21 21:40:39 +00:00
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self.subscriber = subscriber
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2020-03-23 22:56:05 +00:00
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def getName(self):
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return self.name
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2020-03-21 21:40:39 +00:00
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def call(self, *args, **kwargs):
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self.subscriber(*args, **kwargs)
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def cancel(self):
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self.subscriptee.unwire(self)
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2020-03-23 22:56:05 +00:00
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class PropertyManager(ABC):
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def __init__(self):
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self.subscribers = []
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2020-03-23 22:56:05 +00:00
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@abstractmethod
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def __getitem__(self, item):
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pass
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2020-03-21 21:40:39 +00:00
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2020-03-23 22:56:05 +00:00
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@abstractmethod
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def __setitem__(self, key, value):
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pass
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@abstractmethod
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def __contains__(self, item):
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pass
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@abstractmethod
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def __dict__(self):
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pass
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def collect(self, *props):
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return PropertyFilter(self, *props)
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2020-03-21 21:40:39 +00:00
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def wire(self, callback):
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sub = Subscription(self, None, callback)
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self.subscribers.append(sub)
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return sub
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def wireProperty(self, name, callback):
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sub = Subscription(self, name, callback)
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self.subscribers.append(sub)
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if name in self:
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sub.call(self[name])
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return sub
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def unwire(self, sub):
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try:
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self.subscribers.remove(sub)
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except ValueError:
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# happens when already removed before
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pass
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return self
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2020-03-23 22:56:05 +00:00
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def _fireCallbacks(self, name, value):
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for c in self.subscribers:
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try:
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if c.getName() is None:
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c.call(name, value)
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elif c.getName() == name:
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c.call(value)
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except Exception as e:
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logger.exception(e)
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class PropertyLayer(PropertyManager):
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2020-03-23 23:29:59 +00:00
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def __init__(self):
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super().__init__()
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self.properties = {}
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def __contains__(self, name):
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return name in self.properties
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def __getitem__(self, name):
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return self.properties[name]
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def __setitem__(self, name, value):
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2020-03-23 23:18:10 +00:00
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if name in self.properties and self.properties[name] == value:
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return
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logger.debug("property change: %s => %s", name, value)
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self.properties[name] = value
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self._fireCallbacks(name, value)
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def __dict__(self):
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return {k: v for k, v in self.properties.items()}
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class PropertyFilter(PropertyManager):
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def __init__(self, pm: PropertyManager, *props: str):
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super().__init__()
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self.pm = pm
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self.props = props
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self.pm.wire(self.receiveEvent)
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def receiveEvent(self, name, value):
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if name not in self.props:
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return
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self._fireCallbacks(name, value)
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2020-03-23 22:56:05 +00:00
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def __getitem__(self, item):
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if item not in self.props:
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raise KeyError(item)
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return self.pm.__getitem__(item)
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def __setitem__(self, key, value):
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if key not in self.props:
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raise KeyError(key)
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return self.pm.__setitem__(key, value)
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2020-03-23 22:56:05 +00:00
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def __contains__(self, item):
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if item not in self.props:
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return False
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return self.pm.__contains__(item)
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def __dict__(self):
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return {k: v for k, v in self.pm.__dict__().items() if k in self.props}
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2020-03-22 20:51:49 +00:00
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class PropertyStack(PropertyManager):
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def __init__(self):
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super().__init__()
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self.layers = []
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def addLayer(self, priority: int, pm: PropertyManager):
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"""
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highest priority = 0
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"""
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self.layers.append({"priority": priority, "props": pm})
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def eventClosure(name, value):
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self.receiveEvent(pm, name, value)
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pm.wire(eventClosure)
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def receiveEvent(self, layer, name, value):
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if layer != self._getTopLayer(name):
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return
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self._fireCallbacks(name, value)
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2020-03-22 20:51:49 +00:00
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def removeLayer(self, pm: PropertyManager):
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for layer in self.layers:
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if layer["props"] == pm:
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self.layers.remove(layer)
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def _getTopLayer(self, item):
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layers = [la["props"] for la in sorted(self.layers, key=lambda l: l["priority"])]
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for m in layers:
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if item in m:
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return m
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# return top layer by default
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return layers[0]
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def __getitem__(self, item):
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layer = self._getTopLayer(item)
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return layer.__getitem__(item)
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def __setitem__(self, key, value):
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layer = self._getTopLayer(key)
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return layer.__setitem__(key, value)
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def __contains__(self, item):
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layer = self._getTopLayer(item)
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return layer.__contains__(item)
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def __dict__(self):
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keys = [key for l in self.layers for key in l["props"].__dict__().keys()]
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return {k: self.__getitem__(k) for k in keys}
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