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153 lines
4.3 KiB
Python
153 lines
4.3 KiB
Python
from __future__ import absolute_import, unicode_literals
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import io
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import abc
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import sys
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import email
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if sys.version_info > (3,): # pragma: nocover
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import builtins
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from configparser import ConfigParser
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import contextlib
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FileNotFoundError = builtins.FileNotFoundError
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IsADirectoryError = builtins.IsADirectoryError
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NotADirectoryError = builtins.NotADirectoryError
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PermissionError = builtins.PermissionError
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map = builtins.map
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from itertools import filterfalse
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else: # pragma: nocover
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from backports.configparser import ConfigParser
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from itertools import imap as map # type: ignore
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from itertools import ifilterfalse as filterfalse
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import contextlib2 as contextlib
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FileNotFoundError = IOError, OSError
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IsADirectoryError = IOError, OSError
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NotADirectoryError = IOError, OSError
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PermissionError = IOError, OSError
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str = type('')
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suppress = contextlib.suppress
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if sys.version_info > (3, 5): # pragma: nocover
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import pathlib
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else: # pragma: nocover
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import pathlib2 as pathlib
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try:
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ModuleNotFoundError = builtins.FileNotFoundError
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except (NameError, AttributeError): # pragma: nocover
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ModuleNotFoundError = ImportError # type: ignore
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if sys.version_info >= (3,): # pragma: nocover
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from importlib.abc import MetaPathFinder
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else: # pragma: nocover
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class MetaPathFinder(object):
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__metaclass__ = abc.ABCMeta
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__metaclass__ = type
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__all__ = [
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'install', 'NullFinder', 'MetaPathFinder', 'ModuleNotFoundError',
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'pathlib', 'ConfigParser', 'map', 'suppress', 'FileNotFoundError',
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'NotADirectoryError', 'email_message_from_string',
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]
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def install(cls):
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"""
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Class decorator for installation on sys.meta_path.
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Adds the backport DistributionFinder to sys.meta_path and
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attempts to disable the finder functionality of the stdlib
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DistributionFinder.
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"""
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sys.meta_path.append(cls())
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disable_stdlib_finder()
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return cls
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def disable_stdlib_finder():
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"""
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Give the backport primacy for discovering path-based distributions
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by monkey-patching the stdlib O_O.
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See #91 for more background for rationale on this sketchy
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behavior.
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"""
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def matches(finder):
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return (
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getattr(finder, '__module__', None) == '_frozen_importlib_external'
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and hasattr(finder, 'find_distributions')
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)
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for finder in filter(matches, sys.meta_path): # pragma: nocover
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del finder.find_distributions
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class NullFinder:
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"""
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A "Finder" (aka "MetaClassFinder") that never finds any modules,
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but may find distributions.
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"""
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@staticmethod
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def find_spec(*args, **kwargs):
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return None
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# In Python 2, the import system requires finders
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# to have a find_module() method, but this usage
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# is deprecated in Python 3 in favor of find_spec().
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# For the purposes of this finder (i.e. being present
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# on sys.meta_path but having no other import
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# system functionality), the two methods are identical.
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find_module = find_spec
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def py2_message_from_string(text): # nocoverpy3
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# Work around https://bugs.python.org/issue25545 where
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# email.message_from_string cannot handle Unicode on Python 2.
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io_buffer = io.StringIO(text)
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return email.message_from_file(io_buffer)
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email_message_from_string = (
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py2_message_from_string
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if sys.version_info < (3,) else
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email.message_from_string
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)
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class PyPy_repr:
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"""
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Override repr for EntryPoint objects on PyPy to avoid __iter__ access.
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Ref #97, #102.
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"""
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affected = hasattr(sys, 'pypy_version_info')
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def __compat_repr__(self): # pragma: nocover
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def make_param(name):
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value = getattr(self, name)
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return '{name}={value!r}'.format(**locals())
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params = ', '.join(map(make_param, self._fields))
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return 'EntryPoint({params})'.format(**locals())
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if affected: # pragma: nocover
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__repr__ = __compat_repr__
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del affected
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# from itertools recipes
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def unique_everseen(iterable): # pragma: nocover
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"List unique elements, preserving order. Remember all elements ever seen."
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seen = set()
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seen_add = seen.add
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for element in filterfalse(seen.__contains__, iterable):
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seen_add(element)
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yield element
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unique_ordered = (
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unique_everseen if sys.version_info < (3, 7) else dict.fromkeys)
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