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122 lines
3.6 KiB
Python
122 lines
3.6 KiB
Python
"""Abstract base classes related to import."""
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from . import _bootstrap
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from . import machinery
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import abc
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import types
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class Loader(metaclass=abc.ABCMeta):
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"""Abstract base class for import loaders."""
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@abc.abstractmethod
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def load_module(self, fullname:str) -> types.ModuleType:
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"""Abstract method which when implemented should load a module."""
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raise NotImplementedError
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class Finder(metaclass=abc.ABCMeta):
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"""Abstract base class for import finders."""
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@abc.abstractmethod
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def find_module(self, fullname:str, path:[str]=None) -> Loader:
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"""Abstract method which when implemented should find a module."""
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raise NotImplementedError
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Finder.register(machinery.BuiltinImporter)
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Finder.register(machinery.FrozenImporter)
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Finder.register(machinery.PathFinder)
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class ResourceLoader(Loader):
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"""Abstract base class for loaders which can return data from their
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back-end storage.
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This ABC represents one of the optional protocols specified by PEP 302.
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"""
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@abc.abstractmethod
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def get_data(self, path:str) -> bytes:
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"""Abstract method which when implemented should return the bytes for
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the specified path."""
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raise NotImplementedError
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class InspectLoader(Loader):
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"""Abstract base class for loaders which support inspection about the
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modules they can load.
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This ABC represents one of the optional protocols specified by PEP 302.
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"""
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@abc.abstractmethod
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def is_package(self, fullname:str) -> bool:
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"""Abstract method which when implemented should return whether the
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module is a package."""
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return NotImplementedError
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@abc.abstractmethod
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def get_code(self, fullname:str) -> types.CodeType:
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"""Abstract method which when implemented should return the code object
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for the module"""
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return NotImplementedError
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@abc.abstractmethod
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def get_source(self, fullname:str) -> str:
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"""Abstract method which should return the source code for the
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module."""
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return NotImplementedError
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InspectLoader.register(machinery.BuiltinImporter)
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InspectLoader.register(machinery.FrozenImporter)
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class PyLoader(_bootstrap.PyLoader, InspectLoader):
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"""Abstract base class to assist in loading source code by requiring only
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back-end storage methods to be implemented.
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The methods get_code, get_source, and load_module are implemented for the
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user.
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"""
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@abc.abstractmethod
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def source_path(self, fullname:str) -> object:
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"""Abstract method which when implemented should return the path to the
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sourced code for the module."""
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raise NotImplementedError
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class PyPycLoader(_bootstrap.PyPycLoader, PyLoader):
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"""Abstract base class to assist in loading source and bytecode by
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requiring only back-end storage methods to be implemented.
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The methods get_code, get_source, and load_module are implemented for the
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user.
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"""
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@abc.abstractmethod
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def source_mtime(self, fullname:str) -> int:
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"""Abstract method which when implemented should return the
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modification time for the source of the module."""
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raise NotImplementedError
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@abc.abstractmethod
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def bytecode_path(self, fullname:str) -> object:
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"""Abstract method which when implemented should return the path to the
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bytecode for the module."""
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raise NotImplementedError
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@abc.abstractmethod
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def write_bytecode(self, fullname:str, bytecode:bytes):
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"""Abstract method which when implemented should attempt to write the
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bytecode for the module."""
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raise NotImplementedError
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