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