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annotate planemo/lib/python3.7/site-packages/importlib_metadata/_compat.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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1 from __future__ import absolute_import, unicode_literals
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2
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3 import io
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4 import abc
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5 import sys
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6 import email
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7
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8
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9 if sys.version_info > (3,): # pragma: nocover
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10 import builtins
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11 from configparser import ConfigParser
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12 import contextlib
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13 FileNotFoundError = builtins.FileNotFoundError
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14 IsADirectoryError = builtins.IsADirectoryError
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15 NotADirectoryError = builtins.NotADirectoryError
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16 PermissionError = builtins.PermissionError
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17 map = builtins.map
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18 from itertools import filterfalse
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19 else: # pragma: nocover
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20 from backports.configparser import ConfigParser
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21 from itertools import imap as map # type: ignore
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22 from itertools import ifilterfalse as filterfalse
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23 import contextlib2 as contextlib
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24 FileNotFoundError = IOError, OSError
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25 IsADirectoryError = IOError, OSError
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26 NotADirectoryError = IOError, OSError
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27 PermissionError = IOError, OSError
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28
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29 str = type('')
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30
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31 suppress = contextlib.suppress
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32
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33 if sys.version_info > (3, 5): # pragma: nocover
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34 import pathlib
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35 else: # pragma: nocover
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36 import pathlib2 as pathlib
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37
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38 try:
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39 ModuleNotFoundError = builtins.FileNotFoundError
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40 except (NameError, AttributeError): # pragma: nocover
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41 ModuleNotFoundError = ImportError # type: ignore
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42
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43
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44 if sys.version_info >= (3,): # pragma: nocover
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45 from importlib.abc import MetaPathFinder
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46 else: # pragma: nocover
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47 class MetaPathFinder(object):
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48 __metaclass__ = abc.ABCMeta
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49
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50
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51 __metaclass__ = type
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52 __all__ = [
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53 'install', 'NullFinder', 'MetaPathFinder', 'ModuleNotFoundError',
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54 'pathlib', 'ConfigParser', 'map', 'suppress', 'FileNotFoundError',
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55 'NotADirectoryError', 'email_message_from_string',
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56 ]
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57
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58
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59 def install(cls):
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60 """
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61 Class decorator for installation on sys.meta_path.
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62
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63 Adds the backport DistributionFinder to sys.meta_path and
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64 attempts to disable the finder functionality of the stdlib
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65 DistributionFinder.
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66 """
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67 sys.meta_path.append(cls())
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68 disable_stdlib_finder()
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69 return cls
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70
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71
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72 def disable_stdlib_finder():
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73 """
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74 Give the backport primacy for discovering path-based distributions
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75 by monkey-patching the stdlib O_O.
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76
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77 See #91 for more background for rationale on this sketchy
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78 behavior.
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79 """
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80 def matches(finder):
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81 return (
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82 getattr(finder, '__module__', None) == '_frozen_importlib_external'
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83 and hasattr(finder, 'find_distributions')
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84 )
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85 for finder in filter(matches, sys.meta_path): # pragma: nocover
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86 del finder.find_distributions
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87
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88
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89 class NullFinder:
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90 """
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91 A "Finder" (aka "MetaClassFinder") that never finds any modules,
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92 but may find distributions.
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93 """
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94 @staticmethod
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95 def find_spec(*args, **kwargs):
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96 return None
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97
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98 # In Python 2, the import system requires finders
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99 # to have a find_module() method, but this usage
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100 # is deprecated in Python 3 in favor of find_spec().
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101 # For the purposes of this finder (i.e. being present
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102 # on sys.meta_path but having no other import
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103 # system functionality), the two methods are identical.
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104 find_module = find_spec
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105
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106
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107 def py2_message_from_string(text): # nocoverpy3
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108 # Work around https://bugs.python.org/issue25545 where
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109 # email.message_from_string cannot handle Unicode on Python 2.
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110 io_buffer = io.StringIO(text)
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111 return email.message_from_file(io_buffer)
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112
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113
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114 email_message_from_string = (
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115 py2_message_from_string
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116 if sys.version_info < (3,) else
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117 email.message_from_string
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118 )
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119
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120
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121 class PyPy_repr:
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122 """
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123 Override repr for EntryPoint objects on PyPy to avoid __iter__ access.
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124 Ref #97, #102.
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125 """
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126 affected = hasattr(sys, 'pypy_version_info')
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127
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128 def __compat_repr__(self): # pragma: nocover
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129 def make_param(name):
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130 value = getattr(self, name)
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131 return '{name}={value!r}'.format(**locals())
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132 params = ', '.join(map(make_param, self._fields))
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133 return 'EntryPoint({params})'.format(**locals())
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134
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135 if affected: # pragma: nocover
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136 __repr__ = __compat_repr__
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137 del affected
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138
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139
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140 # from itertools recipes
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141 def unique_everseen(iterable): # pragma: nocover
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142 "List unique elements, preserving order. Remember all elements ever seen."
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143 seen = set()
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144 seen_add = seen.add
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145
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146 for element in filterfalse(seen.__contains__, iterable):
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147 seen_add(element)
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148 yield element
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149
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150
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151 unique_ordered = (
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152 unique_everseen if sys.version_info < (3, 7) else dict.fromkeys)