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"""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
import sys
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 Finder(metaclass=abc.ABCMeta):
"""Legacy abstract base class for import finders.
It may be subclassed for compatibility with legacy third party
reimplementations of the import system. Otherwise, finder
implementations should derive from the more specific MetaPathFinder
or PathEntryFinder ABCs.
"""
@abc.abstractmethod
def find_module(self, fullname, path=None):
"""An abstract method that should find a module.
The fullname is a str and the optional path is a str or None.
Returns a Loader object.
"""
raise NotImplementedError
class MetaPathFinder(Finder):
"""Abstract base class for import finders on sys.meta_path."""
@abc.abstractmethod
def find_module(self, fullname, path):
"""Abstract method which, when implemented, should find a module.
The fullname is a str and the path is a str or None.
Returns a Loader object.
"""
raise NotImplementedError
def invalidate_caches(self):
"""An optional method for clearing the finder's cache, if any.
This method is used by importlib.invalidate_caches().
"""
return NotImplemented
_register(MetaPathFinder, machinery.BuiltinImporter, machinery.FrozenImporter,
machinery.PathFinder, machinery.WindowsRegistryFinder)
class PathEntryFinder(Finder):
"""Abstract base class for path entry finders used by PathFinder."""
@abc.abstractmethod
def find_loader(self, fullname):
"""Abstract method which, when implemented, returns a module loader.
The fullname is a str. Returns a 2-tuple of (Loader, portion) where
portion is a sequence of file system locations contributing to part of
a namespace package. The sequence may be empty and the loader may be
None.
"""
raise NotImplementedError
find_module = _bootstrap._find_module_shim
def invalidate_caches(self):
"""An optional method for clearing the finder's cache, if any.
This method is used by PathFinder.invalidate_caches().
"""
return NotImplemented
_register(PathEntryFinder, machinery.FileFinder)
class Loader(metaclass=abc.ABCMeta):
"""Abstract base class for import loaders."""
@abc.abstractmethod
def load_module(self, fullname):
"""Abstract method which when implemented should load a module.
The fullname is a str."""
raise NotImplementedError
@abc.abstractmethod
def module_repr(self, module):
"""Abstract method which when implemented calculates and returns the
given module's repr."""
raise NotImplementedError
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):
"""Abstract method which when implemented should return the bytes for
the specified path. The path must be a str."""
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):
"""Abstract method which when implemented should return whether the
module is a package. The fullname is a str. Returns a bool."""
raise NotImplementedError
@abc.abstractmethod
def get_code(self, fullname):
"""Abstract method which when implemented should return the code object
for the module. The fullname is a str. Returns a types.CodeType."""
raise NotImplementedError
@abc.abstractmethod
def get_source(self, fullname):
"""Abstract method which should return the source code for the
module. The fullname is a str. Returns a str."""
raise NotImplementedError
_register(InspectLoader, machinery.BuiltinImporter, machinery.FrozenImporter,
machinery.ExtensionFileLoader)
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):
"""Abstract method which should return the value that __file__ is to be
set to."""
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
corresponding bytecode).
To support loading from source code, the abstractmethods inherited from
ResourceLoader and ExecutionLoader need to be implemented. To also support
loading from bytecode, the optional methods specified directly by this ABC
is required.
Inherited abstractmethods not implemented in this ABC:
* ResourceLoader.get_data
* ExecutionLoader.get_filename
"""
def path_mtime(self, path):
"""Return the (int) modification time for the path (str)."""
if self.path_stats.__func__ is SourceLoader.path_stats:
raise NotImplementedError
return int(self.path_stats(path)['mtime'])
def path_stats(self, path):
"""Return a metadata dict for the source pointed to by the path (str).
Possible keys:
- 'mtime' (mandatory) is the numeric timestamp of last source
code modification;
- 'size' (optional) is the size in bytes of the source code.
"""
if self.path_mtime.__func__ is SourceLoader.path_mtime:
raise NotImplementedError
return {'mtime': self.path_mtime(path)}
def set_data(self, path, data):
"""Write the bytes to the path (if possible).
Accepts a str path and data as bytes.
Any needed intermediary directories are to be created. If for some
reason the file cannot be written because of permissions, fail
silently.
"""
raise NotImplementedError
_register(SourceLoader, machinery.SourceFileLoader)
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