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annotate planemo/lib/python3.7/site-packages/past/translation/__init__.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
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1 # -*- coding: utf-8 -*-
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2 """
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3 past.translation
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4 ==================
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5
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6 The ``past.translation`` package provides an import hook for Python 3 which
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7 transparently runs ``futurize`` fixers over Python 2 code on import to convert
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8 print statements into functions, etc.
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9
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10 It is intended to assist users in migrating to Python 3.x even if some
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11 dependencies still only support Python 2.x.
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12
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13 Usage
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14 -----
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15
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16 Once your Py2 package is installed in the usual module search path, the import
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17 hook is invoked as follows:
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18
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19 >>> from past.translation import autotranslate
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20 >>> autotranslate('mypackagename')
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21
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22 Or:
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23
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24 >>> autotranslate(['mypackage1', 'mypackage2'])
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25
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26 You can unregister the hook using::
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27
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28 >>> from past.translation import remove_hooks
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29 >>> remove_hooks()
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30
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31 Author: Ed Schofield.
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32 Inspired by and based on ``uprefix`` by Vinay M. Sajip.
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33 """
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34
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35 import imp
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36 import logging
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37 import marshal
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38 import os
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39 import sys
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40 import copy
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41 from lib2to3.pgen2.parse import ParseError
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42 from lib2to3.refactor import RefactoringTool
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43
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44 from libfuturize import fixes
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45
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46
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47 logger = logging.getLogger(__name__)
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48 logger.setLevel(logging.DEBUG)
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49
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50 myfixes = (list(fixes.libfuturize_fix_names_stage1) +
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51 list(fixes.lib2to3_fix_names_stage1) +
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52 list(fixes.libfuturize_fix_names_stage2) +
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53 list(fixes.lib2to3_fix_names_stage2))
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54
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55
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56 # We detect whether the code is Py2 or Py3 by applying certain lib2to3 fixers
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57 # to it. If the diff is empty, it's Python 3 code.
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58
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59 py2_detect_fixers = [
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60 # From stage 1:
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61 'lib2to3.fixes.fix_apply',
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62 # 'lib2to3.fixes.fix_dict', # TODO: add support for utils.viewitems() etc. and move to stage2
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63 'lib2to3.fixes.fix_except',
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64 'lib2to3.fixes.fix_execfile',
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65 'lib2to3.fixes.fix_exitfunc',
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66 'lib2to3.fixes.fix_funcattrs',
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67 'lib2to3.fixes.fix_filter',
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68 'lib2to3.fixes.fix_has_key',
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69 'lib2to3.fixes.fix_idioms',
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70 'lib2to3.fixes.fix_import', # makes any implicit relative imports explicit. (Use with ``from __future__ import absolute_import)
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71 'lib2to3.fixes.fix_intern',
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72 'lib2to3.fixes.fix_isinstance',
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73 'lib2to3.fixes.fix_methodattrs',
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74 'lib2to3.fixes.fix_ne',
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75 'lib2to3.fixes.fix_numliterals', # turns 1L into 1, 0755 into 0o755
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76 'lib2to3.fixes.fix_paren',
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77 'lib2to3.fixes.fix_print',
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78 'lib2to3.fixes.fix_raise', # uses incompatible with_traceback() method on exceptions
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79 'lib2to3.fixes.fix_renames',
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80 'lib2to3.fixes.fix_reduce',
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81 # 'lib2to3.fixes.fix_set_literal', # this is unnecessary and breaks Py2.6 support
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82 'lib2to3.fixes.fix_repr',
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83 'lib2to3.fixes.fix_standarderror',
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84 'lib2to3.fixes.fix_sys_exc',
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85 'lib2to3.fixes.fix_throw',
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86 'lib2to3.fixes.fix_tuple_params',
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87 'lib2to3.fixes.fix_types',
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88 'lib2to3.fixes.fix_ws_comma',
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89 'lib2to3.fixes.fix_xreadlines',
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90
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91 # From stage 2:
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92 'lib2to3.fixes.fix_basestring',
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93 # 'lib2to3.fixes.fix_buffer', # perhaps not safe. Test this.
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94 # 'lib2to3.fixes.fix_callable', # not needed in Py3.2+
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95 # 'lib2to3.fixes.fix_dict', # TODO: add support for utils.viewitems() etc.
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96 'lib2to3.fixes.fix_exec',
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97 # 'lib2to3.fixes.fix_future', # we don't want to remove __future__ imports
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98 'lib2to3.fixes.fix_getcwdu',
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99 # 'lib2to3.fixes.fix_imports', # called by libfuturize.fixes.fix_future_standard_library
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100 # 'lib2to3.fixes.fix_imports2', # we don't handle this yet (dbm)
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101 # 'lib2to3.fixes.fix_input',
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102 # 'lib2to3.fixes.fix_itertools',
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103 # 'lib2to3.fixes.fix_itertools_imports',
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104 'lib2to3.fixes.fix_long',
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105 # 'lib2to3.fixes.fix_map',
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106 # 'lib2to3.fixes.fix_metaclass', # causes SyntaxError in Py2! Use the one from ``six`` instead
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107 'lib2to3.fixes.fix_next',
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108 'lib2to3.fixes.fix_nonzero', # TODO: add a decorator for mapping __bool__ to __nonzero__
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109 # 'lib2to3.fixes.fix_operator', # we will need support for this by e.g. extending the Py2 operator module to provide those functions in Py3
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110 'lib2to3.fixes.fix_raw_input',
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111 # 'lib2to3.fixes.fix_unicode', # strips off the u'' prefix, which removes a potentially helpful source of information for disambiguating unicode/byte strings
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112 # 'lib2to3.fixes.fix_urllib',
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113 'lib2to3.fixes.fix_xrange',
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114 # 'lib2to3.fixes.fix_zip',
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115 ]
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116
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117
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118 class RTs:
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119 """
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120 A namespace for the refactoring tools. This avoids creating these at
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121 the module level, which slows down the module import. (See issue #117).
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122
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123 There are two possible grammars: with or without the print statement.
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124 Hence we have two possible refactoring tool implementations.
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125 """
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126 _rt = None
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127 _rtp = None
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128 _rt_py2_detect = None
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129 _rtp_py2_detect = None
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130
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131 @staticmethod
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132 def setup():
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133 """
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134 Call this before using the refactoring tools to create them on demand
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135 if needed.
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136 """
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137 if None in [RTs._rt, RTs._rtp]:
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138 RTs._rt = RefactoringTool(myfixes)
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139 RTs._rtp = RefactoringTool(myfixes, {'print_function': True})
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140
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141
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142 @staticmethod
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143 def setup_detect_python2():
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144 """
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145 Call this before using the refactoring tools to create them on demand
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146 if needed.
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147 """
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148 if None in [RTs._rt_py2_detect, RTs._rtp_py2_detect]:
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149 RTs._rt_py2_detect = RefactoringTool(py2_detect_fixers)
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150 RTs._rtp_py2_detect = RefactoringTool(py2_detect_fixers,
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151 {'print_function': True})
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152
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153
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154 # We need to find a prefix for the standard library, as we don't want to
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155 # process any files there (they will already be Python 3).
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156 #
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157 # The following method is used by Sanjay Vinip in uprefix. This fails for
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158 # ``conda`` environments:
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159 # # In a non-pythonv virtualenv, sys.real_prefix points to the installed Python.
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160 # # In a pythonv venv, sys.base_prefix points to the installed Python.
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161 # # Outside a virtual environment, sys.prefix points to the installed Python.
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162
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163 # if hasattr(sys, 'real_prefix'):
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164 # _syslibprefix = sys.real_prefix
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165 # else:
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166 # _syslibprefix = getattr(sys, 'base_prefix', sys.prefix)
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167
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168 # Instead, we use the portion of the path common to both the stdlib modules
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169 # ``math`` and ``urllib``.
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170
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171 def splitall(path):
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172 """
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173 Split a path into all components. From Python Cookbook.
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174 """
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175 allparts = []
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176 while True:
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177 parts = os.path.split(path)
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178 if parts[0] == path: # sentinel for absolute paths
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179 allparts.insert(0, parts[0])
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180 break
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181 elif parts[1] == path: # sentinel for relative paths
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182 allparts.insert(0, parts[1])
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183 break
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184 else:
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185 path = parts[0]
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186 allparts.insert(0, parts[1])
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187 return allparts
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188
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189
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190 def common_substring(s1, s2):
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191 """
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192 Returns the longest common substring to the two strings, starting from the
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193 left.
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194 """
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195 chunks = []
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196 path1 = splitall(s1)
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197 path2 = splitall(s2)
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198 for (dir1, dir2) in zip(path1, path2):
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199 if dir1 != dir2:
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200 break
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201 chunks.append(dir1)
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202 return os.path.join(*chunks)
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203
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204 # _stdlibprefix = common_substring(math.__file__, urllib.__file__)
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205
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206
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207 def detect_python2(source, pathname):
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208 """
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209 Returns a bool indicating whether we think the code is Py2
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210 """
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211 RTs.setup_detect_python2()
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212 try:
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213 tree = RTs._rt_py2_detect.refactor_string(source, pathname)
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214 except ParseError as e:
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215 if e.msg != 'bad input' or e.value != '=':
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216 raise
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217 tree = RTs._rtp.refactor_string(source, pathname)
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218
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219 if source != str(tree)[:-1]: # remove added newline
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220 # The above fixers made changes, so we conclude it's Python 2 code
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221 logger.debug('Detected Python 2 code: {0}'.format(pathname))
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222 return True
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223 else:
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224 logger.debug('Detected Python 3 code: {0}'.format(pathname))
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225 return False
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226
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227
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228 class Py2Fixer(object):
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229 """
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230 An import hook class that uses lib2to3 for source-to-source translation of
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231 Py2 code to Py3.
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232 """
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233
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234 # See the comments on :class:future.standard_library.RenameImport.
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235 # We add this attribute here so remove_hooks() and install_hooks() can
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236 # unambiguously detect whether the import hook is installed:
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237 PY2FIXER = True
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238
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239 def __init__(self):
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240 self.found = None
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241 self.base_exclude_paths = ['future', 'past']
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242 self.exclude_paths = copy.copy(self.base_exclude_paths)
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243 self.include_paths = []
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244
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245 def include(self, paths):
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246 """
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247 Pass in a sequence of module names such as 'plotrique.plotting' that,
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248 if present at the leftmost side of the full package name, would
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249 specify the module to be transformed from Py2 to Py3.
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250 """
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251 self.include_paths += paths
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252
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253 def exclude(self, paths):
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254 """
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255 Pass in a sequence of strings such as 'mymodule' that, if
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256 present at the leftmost side of the full package name, would cause
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257 the module not to undergo any source transformation.
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258 """
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259 self.exclude_paths += paths
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260
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261 def find_module(self, fullname, path=None):
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262 logger.debug('Running find_module: {0}...'.format(fullname))
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263 if '.' in fullname:
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264 parent, child = fullname.rsplit('.', 1)
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265 if path is None:
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266 loader = self.find_module(parent, path)
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267 mod = loader.load_module(parent)
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268 path = mod.__path__
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269 fullname = child
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270
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271 # Perhaps we should try using the new importlib functionality in Python
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272 # 3.3: something like this?
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273 # thing = importlib.machinery.PathFinder.find_module(fullname, path)
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274 try:
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275 self.found = imp.find_module(fullname, path)
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276 except Exception as e:
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277 logger.debug('Py2Fixer could not find {0}')
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278 logger.debug('Exception was: {0})'.format(fullname, e))
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279 return None
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280 self.kind = self.found[-1][-1]
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281 if self.kind == imp.PKG_DIRECTORY:
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282 self.pathname = os.path.join(self.found[1], '__init__.py')
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283 elif self.kind == imp.PY_SOURCE:
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284 self.pathname = self.found[1]
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285 return self
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286
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287 def transform(self, source):
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288 # This implementation uses lib2to3,
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289 # you can override and use something else
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290 # if that's better for you
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291
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292 # lib2to3 likes a newline at the end
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293 RTs.setup()
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294 source += '\n'
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295 try:
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296 tree = RTs._rt.refactor_string(source, self.pathname)
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297 except ParseError as e:
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298 if e.msg != 'bad input' or e.value != '=':
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299 raise
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300 tree = RTs._rtp.refactor_string(source, self.pathname)
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301 # could optimise a bit for only doing str(tree) if
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302 # getattr(tree, 'was_changed', False) returns True
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303 return str(tree)[:-1] # remove added newline
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304
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305 def load_module(self, fullname):
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306 logger.debug('Running load_module for {0}...'.format(fullname))
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307 if fullname in sys.modules:
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308 mod = sys.modules[fullname]
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309 else:
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310 if self.kind in (imp.PY_COMPILED, imp.C_EXTENSION, imp.C_BUILTIN,
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311 imp.PY_FROZEN):
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312 convert = False
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313 # elif (self.pathname.startswith(_stdlibprefix)
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314 # and 'site-packages' not in self.pathname):
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315 # # We assume it's a stdlib package in this case. Is this too brittle?
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316 # # Please file a bug report at https://github.com/PythonCharmers/python-future
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317 # # if so.
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318 # convert = False
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319 # in theory, other paths could be configured to be excluded here too
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320 elif any([fullname.startswith(path) for path in self.exclude_paths]):
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321 convert = False
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322 elif any([fullname.startswith(path) for path in self.include_paths]):
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323 convert = True
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324 else:
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325 convert = False
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326 if not convert:
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327 logger.debug('Excluded {0} from translation'.format(fullname))
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328 mod = imp.load_module(fullname, *self.found)
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329 else:
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330 logger.debug('Autoconverting {0} ...'.format(fullname))
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331 mod = imp.new_module(fullname)
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332 sys.modules[fullname] = mod
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333
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334 # required by PEP 302
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335 mod.__file__ = self.pathname
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336 mod.__name__ = fullname
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337 mod.__loader__ = self
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338
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339 # This:
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340 # mod.__package__ = '.'.join(fullname.split('.')[:-1])
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341 # seems to result in "SystemError: Parent module '' not loaded,
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342 # cannot perform relative import" for a package's __init__.py
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343 # file. We use the approach below. Another option to try is the
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344 # minimal load_module pattern from the PEP 302 text instead.
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345
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346 # Is the test in the next line more or less robust than the
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347 # following one? Presumably less ...
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348 # ispkg = self.pathname.endswith('__init__.py')
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349
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350 if self.kind == imp.PKG_DIRECTORY:
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351 mod.__path__ = [ os.path.dirname(self.pathname) ]
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352 mod.__package__ = fullname
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353 else:
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354 #else, regular module
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355 mod.__path__ = []
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356 mod.__package__ = fullname.rpartition('.')[0]
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357
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358 try:
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359 cachename = imp.cache_from_source(self.pathname)
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360 if not os.path.exists(cachename):
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361 update_cache = True
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362 else:
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363 sourcetime = os.stat(self.pathname).st_mtime
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364 cachetime = os.stat(cachename).st_mtime
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365 update_cache = cachetime < sourcetime
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366 # # Force update_cache to work around a problem with it being treated as Py3 code???
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367 # update_cache = True
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368 if not update_cache:
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369 with open(cachename, 'rb') as f:
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370 data = f.read()
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371 try:
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372 code = marshal.loads(data)
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373 except Exception:
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374 # pyc could be corrupt. Regenerate it
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375 update_cache = True
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376 if update_cache:
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377 if self.found[0]:
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378 source = self.found[0].read()
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379 elif self.kind == imp.PKG_DIRECTORY:
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380 with open(self.pathname) as f:
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381 source = f.read()
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382
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383 if detect_python2(source, self.pathname):
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384 source = self.transform(source)
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385
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386 code = compile(source, self.pathname, 'exec')
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387
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388 dirname = os.path.dirname(cachename)
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389 try:
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390 if not os.path.exists(dirname):
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391 os.makedirs(dirname)
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392 with open(cachename, 'wb') as f:
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393 data = marshal.dumps(code)
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394 f.write(data)
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395 except Exception: # could be write-protected
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396 pass
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397 exec(code, mod.__dict__)
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398 except Exception as e:
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399 # must remove module from sys.modules
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400 del sys.modules[fullname]
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401 raise # keep it simple
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402
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403 if self.found[0]:
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404 self.found[0].close()
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405 return mod
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406
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407 _hook = Py2Fixer()
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408
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409
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410 def install_hooks(include_paths=(), exclude_paths=()):
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411 if isinstance(include_paths, str):
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412 include_paths = (include_paths,)
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413 if isinstance(exclude_paths, str):
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414 exclude_paths = (exclude_paths,)
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415 assert len(include_paths) + len(exclude_paths) > 0, 'Pass at least one argument'
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416 _hook.include(include_paths)
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417 _hook.exclude(exclude_paths)
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418 # _hook.debug = debug
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419 enable = sys.version_info[0] >= 3 # enabled for all 3.x+
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420 if enable and _hook not in sys.meta_path:
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421 sys.meta_path.insert(0, _hook) # insert at beginning. This could be made a parameter
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422
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423 # We could return the hook when there are ways of configuring it
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424 #return _hook
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425
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426
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427 def remove_hooks():
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428 if _hook in sys.meta_path:
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429 sys.meta_path.remove(_hook)
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430
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431
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432 def detect_hooks():
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433 """
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434 Returns True if the import hooks are installed, False if not.
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435 """
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436 return _hook in sys.meta_path
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437 # present = any([hasattr(hook, 'PY2FIXER') for hook in sys.meta_path])
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438 # return present
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439
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440
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441 class hooks(object):
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442 """
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443 Acts as a context manager. Use like this:
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444
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445 >>> from past import translation
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446 >>> with translation.hooks():
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447 ... import mypy2module
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448 >>> import requests # py2/3 compatible anyway
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449 >>> # etc.
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450 """
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451 def __enter__(self):
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452 self.hooks_were_installed = detect_hooks()
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453 install_hooks()
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454 return self
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455
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456 def __exit__(self, *args):
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457 if not self.hooks_were_installed:
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458 remove_hooks()
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459
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460
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461 class suspend_hooks(object):
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462 """
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463 Acts as a context manager. Use like this:
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464
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465 >>> from past import translation
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466 >>> translation.install_hooks()
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467 >>> import http.client
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468 >>> # ...
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469 >>> with translation.suspend_hooks():
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470 >>> import requests # or others that support Py2/3
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471
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472 If the hooks were disabled before the context, they are not installed when
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473 the context is left.
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474 """
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475 def __enter__(self):
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476 self.hooks_were_installed = detect_hooks()
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477 remove_hooks()
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478 return self
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479 def __exit__(self, *args):
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480 if self.hooks_were_installed:
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481 install_hooks()
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482
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483
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484 # alias
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485 autotranslate = install_hooks