53 lines
1.5 KiB
Python
53 lines
1.5 KiB
Python
class Field:
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def __set_name__(self, owner, name, virtual=False):
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self.name = name
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self.virtual = virtual
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def __get__(self, inst, cls):
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if inst is None:
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return self
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assert self.name is not None
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return inst._fields[self.name]
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def __set__(self, inst, value):
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assert self.name is not None
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inst._fields[self.name] = value
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def _set_namespace(self, inst, name, namespaces):
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if name is None:
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return
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if name not in namespaces:
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raise KeyError("namespace %s not found" % (name))
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inst._namespace_prefix = name
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def _call(self, inst, method, *args):
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call = getattr(inst, method or '', None)
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if callable(call):
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return call(*args)
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def _create_model(self, inst, name=None, model=None, attribute=None):
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try:
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return inst._fields[self.name]
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except KeyError:
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if model is not None:
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obj = model()
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else:
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obj = self.model()
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if name is not None:
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obj.__name__ = name
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self._set_namespace(obj, self.namespace, inst.__namespace__)
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if attribute:
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inst._fields[attribute] = obj
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else:
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inst._fields[self.name] = obj
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return obj
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def _changed_field(self, inst, name, value):
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for fun in inst._on_change_fields[name]:
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fun(inst, name, value)
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