annotate compat.py @ 124:19c42a3cd962

Very fast testees no longer break Popen on some UNIX systems on Python 2.6+
author Oleg Oshmyan <chortos@inbox.lv>
date Sun, 24 Apr 2011 20:05:20 +0100
parents cd347cfca272
children e17ae4ccbc58 92f76baebcc6
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1 # Copyright (c) 2010-2011 Chortos-2 <chortos@inbox.lv>
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2
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3 # A compatibility layer for Python 2.5+. This is what lets test.py
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4 # run on all versions of Python starting with 2.5, including Python 3.
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5
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6 # A few notes regarding some compatibility-driven peculiarities
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7 # in the use of the language that can be seen in all modules:
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8 #
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9 # * Except statements never specify target; instead, when needed,
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10 # the exception is taken from sys.exc_info(). Blame the incompatible
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11 # syntaxes of the except clause in Python 2.5 and Python 3 and the lack
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12 # of preprocessor macros in Python of any version ;P.
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13 #
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14 # * Keyword-only parameters are never used, even for parameters
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15 # that should never be given in as arguments. The reason is
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16 # the laziness of some Python developers who have failed to finish
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17 # implementing them in Python 2 even though they had several years
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18 # of time and multiple version releases to sneak them in.
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19 #
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20 # * Abstract classes are only implemented for Python 2.6 and 2.7.
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21 # ABC's require the abc module and the specification of metaclasses,
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22 # but in Python 2.5, the abc module does not exist, while in Python 3,
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23 # metaclasses are specified using a syntax totally incompatible
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24 # with Python 2 and not usable conditionally via exec() and such
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25 # because it is a detail of the syntax of the class statement itself.
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26
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27 # Some code was adapted from Python 2.7.1 and its documentation.
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28 # This code is clearly marked as such in preceding comments and is
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29 # covered by copyright as follows:
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30 #
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31 # Copyright (c) 2001-2010 Python Software Foundation; all rights reserved.
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32 #
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33 # The code is used according to the PSF License Agreement
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34 # for Python 2.7.1, whose full text is available from your local
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35 # installation of Python (enter 'license()' in the interactive
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36 # interpreter) or from the Web at the following URL:
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37 #
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38 # http://docs.python.org/2.7.1/license.html#terms-and-conditions-for-accessing-or-otherwise-using-python
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39
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40 try:
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41 import builtins
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42 except ImportError:
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43 import __builtin__ as builtins
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44
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45 pseudobuiltins = ('say', 'basestring', 'range', 'map', 'zip', 'filter', 'next',
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46 'items', 'keys', 'values', 'zip_longest', 'callable', 'ceil')
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47 __all__ = pseudobuiltins + ('ABCMeta', 'abstractmethod', 'CompatBuiltins')
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48
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49 try:
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50 # Python 3
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51 exec('say = print')
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52 except SyntaxError:
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53 try:
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54 # Python 2.6/2.7
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55 # An alternative is exec('from __future__ import print_function; say = print');
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56 # if problems arise with the current line, one should try replacing it
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57 # with this one with the future import before abandoning the idea altogether
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58 say = getattr(builtins, 'print')
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59 except Exception:
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60 # Python 2.5
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61 import sys
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62 # This should fully emulate the print function of Python 2.6 in Python 2.3+
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63 # The error messages are taken from Python 2.6
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64 # The name bindings at the bottom of this file are in effect
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65 def saytypeerror(value, name):
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66 return TypeError(' '.join((name, 'must be None, str or unicode, not', type(value).__name__)))
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67 def say(*values, **kwargs):
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68 sep = kwargs.pop('sep' , None)
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69 end = kwargs.pop('end' , None)
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70 file = kwargs.pop('file', None)
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71 if kwargs: raise TypeError("'%s' is an invalid keyword argument for this function" % kwargs.popitem()[0])
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72 if sep is None: sep = ' '
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73 if end is None: end = '\n'
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74 if file is None: file = sys.stdout
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75 if not isinstance(sep, basestring): raise saytypeerror(sep, 'sep')
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76 if not isinstance(end, basestring): raise saytypeerror(end, 'end')
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77 file.write(sep.join(map(str, values)) + end)
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79 try:
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80 from os.path import relpath
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81 except ImportError:
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82 # Python 2.5
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83 import os.path as _path
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84
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85 # Adapted from Python 2.7.1
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86
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87 if hasattr(_path, 'splitunc'):
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88 def _abspath_split(path):
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89 abs = _path.abspath(_path.normpath(path))
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90 prefix, rest = _path.splitunc(abs)
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91 is_unc = bool(prefix)
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92 if not is_unc:
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93 prefix, rest = _path.splitdrive(abs)
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94 return is_unc, prefix, [x for x in rest.split(_path.sep) if x]
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95 else:
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96 def _abspath_split(path):
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97 prefix, rest = _path.splitdrive(_path.abspath(_path.normpath(path)))
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98 return False, prefix, [x for x in rest.split(_path.sep) if x]
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99
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100 def relpath(path, start=_path.curdir):
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101 """Return a relative version of a path"""
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102
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103 if not path:
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104 raise ValueError("no path specified")
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105
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106 start_is_unc, start_prefix, start_list = _abspath_split(start)
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107 path_is_unc, path_prefix, path_list = _abspath_split(path)
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108
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109 if path_is_unc ^ start_is_unc:
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110 raise ValueError("Cannot mix UNC and non-UNC paths (%s and %s)"
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111 % (path, start))
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112 if path_prefix.lower() != start_prefix.lower():
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113 if path_is_unc:
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114 raise ValueError("path is on UNC root %s, start on UNC root %s"
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115 % (path_prefix, start_prefix))
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116 else:
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117 raise ValueError("path is on drive %s, start on drive %s"
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118 % (path_prefix, start_prefix))
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119 # Work out how much of the filepath is shared by start and path.
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120 i = 0
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121 for e1, e2 in zip(start_list, path_list):
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122 if e1.lower() != e2.lower():
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123 break
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124 i += 1
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125
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126 rel_list = [_path.pardir] * (len(start_list)-i) + path_list[i:]
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127 if not rel_list:
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128 return _path.curdir
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129 return _path.join(*rel_list)
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130
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131 _path.relpath = relpath
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132
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133 def import_urllib():
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134 try:
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135 # Python 3
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136 import urllib.request
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137 return urllib.request, lambda url: urllib.request.urlopen(url).read().decode('ascii')
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138 except ImportError:
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139 # Python 2
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140 import urllib
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141 return urllib, lambda url: urllib.urlopen(url).read()
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142
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143 try:
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144 from abc import ABCMeta, abstractmethod
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145 except ImportError:
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146 ABCMeta, abstractmethod = None, lambda x: x
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147
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148 try:
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149 basestring = basestring
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150 except NameError:
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151 basestring = str
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152
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153 # xrange is set to support simple testconf.py's written for test.py 1.x
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154 try:
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155 xrange = range = xrange
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156 except NameError:
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157 xrange = range = range
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158
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159 try:
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160 callable = callable
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161 except NameError:
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162 from collections import Callable
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163 callable = lambda obj: isinstance(obj, Callable)
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164
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165 try:
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166 next = next
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167 except NameError:
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168 next = lambda obj: obj.next()
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169
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170 try:
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171 from itertools import imap as map
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172 except ImportError:
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173 map = map
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174
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175 try:
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176 from itertools import izip as zip
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177 except ImportError:
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178 zip = zip
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179
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180 try:
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181 from itertools import ifilter as filter
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182 except ImportError:
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183 filter = filter
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184
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185 try:
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186 items = dict.iteritems
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187 except AttributeError:
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188 items = dict.items
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189
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190 try:
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191 keys = dict.iterkeys
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192 except AttributeError:
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193 keys = dict.keys
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194
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195 try:
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196 values = dict.itervalues
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197 except AttributeError:
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198 values = dict.values
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199
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200 from math import ceil
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201 if not isinstance(ceil(0), int):
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202 def ceil(x):
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203 y = int(x)
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204 if y < x: y += 1
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205 return y
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206
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207 try:
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208 # Python 3
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209 from itertools import zip_longest
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210 except ImportError:
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211 try:
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212 # Python 2.6/2.7
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213 from itertools import izip_longest as zip_longest
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214 except ImportError:
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215 # Python 2.5
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216 from itertools import chain, repeat
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217 # Adapted from the documentation of itertools.izip_longest
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218 def zip_longest(*args, **kwargs):
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219 fillvalue = kwargs.get('fillvalue')
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220 def sentinel(counter=([fillvalue]*(len(args)-1)).pop):
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221 yield counter()
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222 fillers = repeat(fillvalue)
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223 iters = [chain(it, sentinel(), fillers) for it in args]
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224 try:
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225 for tup in zip(*iters):
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226 yield tup
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227 except IndexError:
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228 pass
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229
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230 # Automatically import * from this module into testconf.py's
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231 class CompatBuiltins(object):
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232 __slots__ = 'originals'
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233 globals = globals()
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234 def __enter__(self):
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235 self.originals = {}
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236 for name in pseudobuiltins:
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237 try:
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238 self.originals[name] = getattr(builtins, name)
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239 except AttributeError:
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240 pass
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241 setattr(builtins, name, self.globals[name])
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242 return self
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243 def __exit__(self, exc_type, exc_val, exc_tb):
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244 for name in self.originals:
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245 setattr(builtins, name, self.originals[name])