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50 lines
1.8 KiB
Python
50 lines
1.8 KiB
Python
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from typing import Iterable, Tuple, Union, TYPE_CHECKING
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import weakref
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from collections import UserDict
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import srsly
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from .span_group import SpanGroup
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if TYPE_CHECKING:
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# This lets us add type hints for mypy etc. without causing circular imports
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from .doc import Doc # noqa: F401
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from .span import Span # noqa: F401
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# Why inherit from UserDict instead of dict here?
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# Well, the 'dict' class doesn't necessarily delegate everything nicely,
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# for performance reasons. The UserDict is slower by better behaved.
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# See https://treyhunner.com/2019/04/why-you-shouldnt-inherit-from-list-and-dict-in-python/0ww
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class SpanGroups(UserDict):
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"""A dict-like proxy held by the Doc, to control access to span groups."""
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def __init__(
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self, doc: "Doc", items: Iterable[Tuple[str, SpanGroup]] = tuple()
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) -> None:
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self.doc_ref = weakref.ref(doc)
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UserDict.__init__(self, items)
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def __setitem__(self, key: str, value: Union[SpanGroup, Iterable["Span"]]) -> None:
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if not isinstance(value, SpanGroup):
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value = self._make_span_group(key, value)
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assert value.doc is self.doc_ref()
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UserDict.__setitem__(self, key, value)
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def _make_span_group(self, name: str, spans: Iterable["Span"]) -> SpanGroup:
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return SpanGroup(self.doc_ref(), name=name, spans=spans)
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def to_bytes(self) -> bytes:
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# We don't need to serialize this as a dict, because the groups
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# know their names.
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msg = [value.to_bytes() for value in self.values()]
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return srsly.msgpack_dumps(msg)
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def from_bytes(self, bytes_data: bytes) -> "SpanGroups":
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msg = srsly.msgpack_loads(bytes_data)
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self.clear()
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doc = self.doc_ref()
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for value_bytes in msg:
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group = SpanGroup(doc).from_bytes(value_bytes)
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self[group.name] = group
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return self
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