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Issue #14605: Expose importlib.abc.FileLoader and

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importlib.machinery.(FileFinder, SourceFileLoader,
_SourcelessFileLoader, ExtensionFileLoader).

This exposes all of importlib's mechanisms that will become public on
the sys module.
This commit is contained in:
Brett Cannon 2012-04-22 19:58:33 -04:00
parent 8c5e920ae3
commit 938d44d59c
17 changed files with 3246 additions and 3076 deletions
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33
Lib/importlib/abc.py
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@ -1,6 +1,12 @@
"""Abstract base classes related to import."""
from . import _bootstrap
from . import machinery
try:
import _frozen_importlib
except ImportError as exc:
if exc.name != '_frozen_importlib':
raise
_frozen_importlib = None
import abc
import imp
import marshal
@ -9,6 +15,14 @@ import tokenize
import warnings
def _register(abstract_cls, *classes):
for cls in classes:
abstract_cls.register(cls)
if _frozen_importlib is not None:
frozen_cls = getattr(_frozen_importlib, cls.__name__)
abstract_cls.register(frozen_cls)
class Loader(metaclass=abc.ABCMeta):
"""Abstract base class for import loaders."""
@ -32,9 +46,8 @@ class Finder(metaclass=abc.ABCMeta):
"""
raise NotImplementedError
Finder.register(machinery.BuiltinImporter)
Finder.register(machinery.FrozenImporter)
Finder.register(machinery.PathFinder)
_register(Finder, machinery.BuiltinImporter, machinery.FrozenImporter,
machinery.PathFinder, machinery.FileFinder)
class ResourceLoader(Loader):
@ -80,8 +93,8 @@ class InspectLoader(Loader):
module. The fullname is a str. Returns a str."""
raise NotImplementedError
InspectLoader.register(machinery.BuiltinImporter)
InspectLoader.register(machinery.FrozenImporter)
_register(InspectLoader, machinery.BuiltinImporter, machinery.FrozenImporter,
machinery.ExtensionFileLoader)
class ExecutionLoader(InspectLoader):
@ -100,6 +113,15 @@ class ExecutionLoader(InspectLoader):
raise NotImplementedError
class FileLoader(_bootstrap.FileLoader, ResourceLoader, ExecutionLoader):
"""Abstract base class partially implementing the ResourceLoader and
ExecutionLoader ABCs."""
_register(FileLoader, machinery.SourceFileLoader,
machinery._SourcelessFileLoader)
class SourceLoader(_bootstrap.SourceLoader, ResourceLoader, ExecutionLoader):
"""Abstract base class for loading source code (and optionally any
@ -146,6 +168,7 @@ class SourceLoader(_bootstrap.SourceLoader, ResourceLoader, ExecutionLoader):
"""
raise NotImplementedError
_register(SourceLoader, machinery.SourceFileLoader)
class PyLoader(SourceLoader):