cpython/Lib/importlib/abc.py
Brett Cannon 2e3155e2fe Merged revisions 74107 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/branches/py3k

........
  r74107 | brett.cannon | 2009-07-19 20:19:18 -0700 (Sun, 19 Jul 2009) | 8 lines

  Importlib's documentation said that importlib.abc.PyLoader inherited from
  importlib.abc.ResourceLoader, when in fact it did not. Fixed the ABC to inherit
  as documented.

  This does in introduce an backwards-incompatiblity as the code in PyLoader
  already required the single method ResourceLoader defined as an abstract
  method.
........
2009-07-20 03:22:43 +00:00

122 lines
3.6 KiB
Python

"""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 PyLoader(_bootstrap.PyLoader, ResourceLoader, InspectLoader):
"""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