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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.
See PEP 302 for details.
"""
def load_module(self, fullname:str) -> types.ModuleType:
raise NotImplementedError
Loader.register(machinery.BuiltinImporter)
Loader.register(machinery.FrozenImporter)
class Finder(metaclass=abc.ABCMeta):
"""Abstract base class for import finders.
See PEP 302 for details.
"""
@abc.abstractmethod
def find_module(self, fullname:str, path:[str]=None) -> Loader:
raise NotImplementedError
Finder.register(machinery.BuiltinImporter)
Finder.register(machinery.FrozenImporter)
Finder.register(machinery.PathFinder)
class Importer(Finder, Loader):
"""Abstract base class for importers."""
class ResourceLoader(Loader):
"""Abstract base class for loaders which can return data from the back-end
storage.
This ABC represents one of the optional protocols specified by PEP 302.
"""
@abc.abstractmethod
def get_data(self, path:str) -> bytes:
raise NotImplementedError
class InspectLoader(Loader):
"""Abstract base class for loaders which supports introspection.
This ABC represents one of the optional protocols specified by PEP 302.
"""
@abc.abstractmethod
def is_package(self, fullname:str) -> bool:
return NotImplementedError
@abc.abstractmethod
def get_code(self, fullname:str) -> types.CodeType:
return NotImplementedError
@abc.abstractmethod
def get_source(self, fullname:str) -> str:
return NotImplementedError
class PyLoader(_bootstrap.PyLoader, InspectLoader):
"""Abstract base class that implements the core parts needed to load Python
source code."""
# load_module and get_code are implemented.
@abc.abstractmethod
def source_path(self, fullname:str) -> object:
raise NotImplementedError
class PyPycLoader(_bootstrap.PyPycLoader, PyLoader):
"""Abstract base class that implements the core parts needed to load Python
source and bytecode."""
# Implements load_module and get_code.
@abc.abstractmethod
def source_mtime(self, fullname:str) -> int:
raise NotImplementedError
@abc.abstractmethod
def bytecode_path(self, fullname:str) -> object:
raise NotImplementedError
@abc.abstractmethod
def write_bytecode(self, fullname:str, bytecode:bytes):
raise NotImplementedError
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