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Move _LazyResourceMap out of ResourceFile

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dgelessus 2019-12-03 15:56:09 +01:00
parent af2ac70676
commit cf6ce3c2a6
1 changed files with 43 additions and 44 deletions
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87
rsrcfork/api.py
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@ -229,51 +229,50 @@ class Resource(object):
else:
return self.data_raw
class _LazyResourceMap(typing.Mapping[int, Resource]):
"""Internal class: Read-only wrapper for a mapping of resource IDs to resource objects.
This class behaves like a normal read-only mapping. The main difference to a plain dict (or similar mapping) is that this mapping has a specialized repr to avoid excessive output when working in the REPL.
"""
_submap: typing.Mapping[int, Resource]
def __init__(self, submap: typing.Mapping[int, Resource]) -> None:
"""Create a new _LazyResourceMap that wraps the given mapping."""
super().__init__()
self._submap = submap
def __len__(self) -> int:
"""Get the number of resources with this type code."""
return len(self._submap)
def __iter__(self) -> typing.Iterator[int]:
"""Iterate over the IDs of all resources with this type code."""
return iter(self._submap)
def __contains__(self, key: object) -> bool:
"""Check if a resource with the given ID exists for this type code."""
return key in self._submap
def __getitem__(self, key: int) -> Resource:
"""Get a resource with the given ID for this type code."""
return self._submap[key]
def __repr__(self) -> str:
if len(self) == 1:
return f"<{type(self).__module__}.{type(self).__qualname__} at {id(self):#x} containing one resource: {next(iter(self.values()))}>"
else:
return f"<{type(self).__module__}.{type(self).__qualname__} at {id(self):#x} containing {len(self)} resources with IDs: {list(self)}>"
class ResourceFile(typing.Mapping[bytes, typing.Mapping[int, Resource]], typing.ContextManager["ResourceFile"]):
"""A resource file reader operating on a byte stream."""
# noinspection PyProtectedMember
class _LazyResourceMap(typing.Mapping[int, Resource]):
"""Internal class: Read-only wrapper for a mapping of resource IDs to resource objects.
This class behaves like a normal read-only mapping. The main difference to a plain dict (or similar mapping) is that this mapping has a specialized repr to avoid excessive output when working in the REPL.
"""
_submap: typing.Mapping[int, Resource]
def __init__(self, submap: typing.Mapping[int, Resource]) -> None:
"""Create a new _LazyResourceMap that wraps the given mapping."""
super().__init__()
self._submap = submap
def __len__(self) -> int:
"""Get the number of resources with this type code."""
return len(self._submap)
def __iter__(self) -> typing.Iterator[int]:
"""Iterate over the IDs of all resources with this type code."""
return iter(self._submap)
def __contains__(self, key: object) -> bool:
"""Check if a resource with the given ID exists for this type code."""
return key in self._submap
def __getitem__(self, key: int) -> Resource:
"""Get a resource with the given ID for this type code."""
return self._submap[key]
def __repr__(self) -> str:
if len(self) == 1:
return f"<{type(self).__module__}.{type(self).__qualname__} at {id(self):#x} containing one resource: {next(iter(self.values()))}>"
else:
return f"<{type(self).__module__}.{type(self).__qualname__} at {id(self):#x} containing {len(self)} resources with IDs: {list(self)}>"
_close_stream: bool
_stream: typing.BinaryIO
@ -500,10 +499,10 @@ class ResourceFile(typing.Mapping[bytes, typing.Mapping[int, Resource]], typing.
return key in self._references
def __getitem__(self, key: bytes) -> "ResourceFile._LazyResourceMap":
def __getitem__(self, key: bytes) -> "_LazyResourceMap":
"""Get a lazy mapping of all resources with the given type in this ResourceFile."""
return ResourceFile._LazyResourceMap(self._references[key])
return _LazyResourceMap(self._references[key])
def __repr__(self) -> str:
return f"<{type(self).__module__}.{type(self).__qualname__} at {id(self):#x}, attributes {self.file_attributes}, containing {len(self)} resource types: {list(self)}>"