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"""Contains the base class for PPP nodes.""" |
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from ..utils.typedattributesholder import TypedAttributesHolder |
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from ..utils.serializableattributesholder import SerializableAttributesHolder |
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from ..log import logger |
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from .. import exceptions |
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class SerializableTypedAttributesHolder(SerializableAttributesHolder, TypedAttributesHolder): |
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@staticmethod |
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def _test_can_import_json(data): |
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"""Sanity check on input JSON data""" |
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if 'type' not in data: |
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raise exceptions.AttributeNotProvided('type') |
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if data['type'] not in TYPE_TO_CLASS: |
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raise exceptions.UnknownNodeType(data['type']) |
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@classmethod |
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def _select_class(cls, data): |
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return TYPE_TO_CLASS[data['type']] |
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def __eq__(self, other): |
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if isinstance(other, dict): |
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return self == SerializableTypedAttributesHolder.from_dict(other) |
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else: |
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return super(SerializableTypedAttributesHolder, self).__eq__(other) |
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def __hash__(self): |
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return super(SerializableTypedAttributesHolder, self).__hash__() |
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TYPE_TO_CLASS = {} |
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def register(cls): |
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"""Register a class to make it available to the deserializer.""" |
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assert cls._type |
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TYPE_TO_CLASS[cls._type] = cls |
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return cls |
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class AbstractNode(SerializableTypedAttributesHolder): |
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"""SerializableAttributesHolder with methods for making operations |
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on trees.""" |
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def fold(self, predicate): |
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"""Takes a predicate and applies it to each node starting from the |
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leaves and making the return value propagate.""" |
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childs = {x:y.fold(predicate) for (x,y) in self._attributes.items() |
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if isinstance(y, SerializableTypedAttributesHolder)} |
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return predicate(self, childs) |
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def traverse(self, predicate): |
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def wrapper(tree): |
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if isinstance(tree, SerializableTypedAttributesHolder): |
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return tree.traverse(predicate) |
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else: |
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return tree |
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arguments = {x: wrapper(y) |
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for (x, y) in self._attributes.items() |
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if x != 'type'} |
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return predicate(self.__class__(**arguments)) |
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ProjetPP /
PPP-datamodel-Python
