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124 lines
3.5 KiB
124 lines
3.5 KiB
3 years ago
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import collections
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import zipfile
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import pathlib
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from . import abc
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def remove_duplicates(items):
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return iter(collections.OrderedDict.fromkeys(items))
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class FileReader(abc.TraversableResources):
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def __init__(self, loader):
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self.path = pathlib.Path(loader.path).parent
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def resource_path(self, resource):
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"""
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Return the file system path to prevent
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`resources.path()` from creating a temporary
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copy.
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"""
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return str(self.path.joinpath(resource))
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def files(self):
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return self.path
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class ZipReader(abc.TraversableResources):
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def __init__(self, loader, module):
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_, _, name = module.rpartition('.')
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self.prefix = loader.prefix.replace('\\', '/') + name + '/'
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self.archive = loader.archive
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def open_resource(self, resource):
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try:
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return super().open_resource(resource)
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except KeyError as exc:
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raise FileNotFoundError(exc.args[0])
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def is_resource(self, path):
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# workaround for `zipfile.Path.is_file` returning true
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# for non-existent paths.
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target = self.files().joinpath(path)
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return target.is_file() and target.exists()
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def files(self):
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return zipfile.Path(self.archive, self.prefix)
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class MultiplexedPath(abc.Traversable):
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"""
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Given a series of Traversable objects, implement a merged
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version of the interface across all objects. Useful for
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namespace packages which may be multihomed at a single
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name.
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"""
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def __init__(self, *paths):
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self._paths = list(map(pathlib.Path, remove_duplicates(paths)))
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if not self._paths:
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message = 'MultiplexedPath must contain at least one path'
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raise FileNotFoundError(message)
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if not all(path.is_dir() for path in self._paths):
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raise NotADirectoryError('MultiplexedPath only supports directories')
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def iterdir(self):
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visited = []
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for path in self._paths:
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for file in path.iterdir():
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if file.name in visited:
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continue
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visited.append(file.name)
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yield file
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def read_bytes(self):
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raise FileNotFoundError(f'{self} is not a file')
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def read_text(self, *args, **kwargs):
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raise FileNotFoundError(f'{self} is not a file')
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def is_dir(self):
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return True
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def is_file(self):
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return False
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def joinpath(self, child):
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# first try to find child in current paths
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for file in self.iterdir():
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if file.name == child:
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return file
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# if it does not exist, construct it with the first path
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return self._paths[0] / child
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__truediv__ = joinpath
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def open(self, *args, **kwargs):
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raise FileNotFoundError(f'{self} is not a file')
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@property
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def name(self):
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return self._paths[0].name
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def __repr__(self):
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paths = ', '.join(f"'{path}'" for path in self._paths)
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return f'MultiplexedPath({paths})'
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class NamespaceReader(abc.TraversableResources):
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def __init__(self, namespace_path):
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if 'NamespacePath' not in str(namespace_path):
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raise ValueError('Invalid path')
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self.path = MultiplexedPath(*list(namespace_path))
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def resource_path(self, resource):
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"""
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Return the file system path to prevent
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`resources.path()` from creating a temporary
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copy.
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"""
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return str(self.path.joinpath(resource))
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def files(self):
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return self.path
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