mirror of
https://github.com/jxxghp/MoviePilot.git
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65 lines
2.4 KiB
Python
65 lines
2.4 KiB
Python
"""来源投影共享的不可变映射构造机制。"""
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from __future__ import annotations
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from collections.abc import Mapping
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from copy import deepcopy
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from typing import Any
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def _copy_value(value: Any) -> Any:
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"""递归复制只读容器，避免 ``mappingproxy`` 等对象破坏投影合同。"""
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if isinstance(value, Mapping):
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return {_copy_value(key): _copy_value(item) for key, item in value.items()}
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if isinstance(value, list):
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return [_copy_value(item) for item in value]
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if isinstance(value, tuple):
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return tuple(_copy_value(item) for item in value)
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if isinstance(value, set):
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return {_copy_value(item) for item in value}
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if isinstance(value, frozenset):
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return frozenset(_copy_value(item) for item in value)
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return deepcopy(value)
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class ProjectionBuilder:
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"""在不修改来源和当前快照的前提下累积字段投影。"""
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def __init__(self, current: Mapping[str, Any]) -> None:
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"""保存当前领域字段快照，后续读取同时考虑已投影值。"""
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self._current = current
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self._changes: dict[str, Any] = {}
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def get(self, name: str, default: Any = None) -> Any:
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"""返回已投影值，未投影时回退到当前字段快照。"""
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return self._changes.get(name, self._current.get(name, default))
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def set(self, name: str, value: Any) -> None:
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"""记录字段的新值，并隔离可变来源对象。"""
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self._changes[name] = _copy_value(value)
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def set_missing(self, name: str, value: Any) -> None:
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"""仅当当前字段为空时记录来源值。"""
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if not self.get(name):
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self.set(name, value)
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def fill_missing(
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self,
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source: Mapping[str, Any],
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*,
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skip: frozenset[str] = frozenset(),
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) -> None:
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"""按历史同类型规则补齐当前快照中存在的空字段。"""
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for name, value in source.items():
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if name in skip or not value or name not in self._current:
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continue
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current_value = self.get(name)
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if current_value:
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continue
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if current_value is None or type(current_value) is type(value):
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self.set(name, value)
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def build(self) -> dict[str, Any]:
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"""返回与当前快照隔离的投影结果。"""
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return dict(self._changes)
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