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68 lines
1.8 KiB
68 lines
1.8 KiB
6 years ago
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class BaseContext(object):
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def __init__(self, evaluator, parent_context=None):
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self.evaluator = evaluator
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self.parent_context = parent_context
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def get_root_context(self):
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context = self
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while True:
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if context.parent_context is None:
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return context
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context = context.parent_context
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class BaseContextSet(object):
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def __init__(self, *args):
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self._set = set(args)
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@classmethod
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def from_iterable(cls, iterable):
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return cls.from_set(set(iterable))
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@classmethod
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def from_set(cls, set_):
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self = cls()
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self._set = set_
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return self
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@classmethod
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def from_sets(cls, sets):
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"""
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Used to work with an iterable of set.
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"""
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aggregated = set()
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sets = list(sets)
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for set_ in sets:
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if isinstance(set_, BaseContextSet):
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aggregated |= set_._set
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else:
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aggregated |= set_
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return cls.from_set(aggregated)
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def __or__(self, other):
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return type(self).from_set(self._set | other._set)
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def __iter__(self):
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for element in self._set:
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yield element
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def __bool__(self):
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return bool(self._set)
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def __len__(self):
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return len(self._set)
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def __repr__(self):
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return '%s(%s)' % (self.__class__.__name__, ', '.join(str(s) for s in self._set))
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def filter(self, filter_func):
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return type(self).from_iterable(filter(filter_func, self._set))
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def __getattr__(self, name):
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def mapper(*args, **kwargs):
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return type(self).from_sets(
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getattr(context, name)(*args, **kwargs)
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for context in self._set
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)
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return mapper
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