annotate compat.py @ 64:94946bc0a3a8

Grand grand -> grand
author Oleg Oshmyan <chortos@inbox.lv>
date Wed, 22 Dec 2010 19:12:45 +0200
parents 4ea7133ac25c
children e0f8b28e15b5
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1 #! /usr/bin/env python
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2 # Copyright (c) 2010 Chortos-2 <chortos@inbox.lv>
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3
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4 # A compatibility layer for Python 2.5+. This is what lets test.py
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5 # run on all versions of Python starting with 2.5, including Python 3.
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6
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7 # A few notes regarding some compatibility-driven peculiarities
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8 # in the use of the language that can be seen in all modules:
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9 #
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10 # * Except statements never specify target; instead, when needed,
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11 # the exception is taken from sys.exc_info(). Blame the incompatible
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12 # syntaxes of the except clause in Python 2.5 and Python 3 and the lack
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13 # of preprocessor macros in Python of any version ;P.
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14 #
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15 # * Keyword-only parameters are never used, even for parameters
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16 # that should never be given in as arguments. The reason is
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17 # the laziness of some Python developers who have failed to finish
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18 # implementing them in Python 2 even though they had several years
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19 # of time and multiple version releases to sneak them in.
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20 #
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21 # * Abstract classes are only implemented for Python 2.6 and 2.7.
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22 # ABC's require the abc module and the specification of metaclasses,
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23 # but in Python 2.5, the abc module does not exist, while in Python 3,
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24 # metaclasses are specified using a syntax totally incompatible
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25 # with Python 2 and not usable conditionally via exec() and such
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26 # because it is a detail of the syntax of the class statement itself.
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27
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28 try:
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29 import builtins
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30 except ImportError:
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31 import __builtin__ as builtins
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32
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33 __all__ = ('say', 'basestring', 'range', 'map', 'zip', 'filter', 'items',
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34 'keys', 'values', 'zip_longest', 'callable',
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35 'ABCMeta', 'abstractmethod', 'CompatBuiltins')
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36
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37 try:
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38 # Python 3
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39 exec('say = print')
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40 except SyntaxError:
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41 try:
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42 # Python 2.6/2.7
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43 # An alternative is exec('from __future__ import print_function; say = print');
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44 # if problems arise with the current line, one should try replacing it
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45 # with this one with the future import before abandoning the idea altogether
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46 say = getattr(builtins, 'print')
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47 except Exception:
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48 # Python 2.5
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49 import sys
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50 # This should fully emulate the print function of Python 2.6 in Python 2.3+
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51 # The error messages are taken from Python 2.6
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52 # The name bindings at the bottom of this file are in effect
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53 def saytypeerror(value, name):
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54 return TypeError(' '.join((name, 'must be None, str or unicode, not', type(value).__name__)))
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55 def say(*values, **kwargs):
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56 sep = kwargs.pop('sep' , None)
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57 end = kwargs.pop('end' , None)
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58 file = kwargs.pop('file', None)
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59 if kwargs: raise TypeError("'%s' is an invalid keyword argument for this function" % kwargs.popitem()[0])
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60 if sep is None: sep = ' '
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61 if end is None: end = '\n'
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62 if file is None: file = sys.stdout
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63 if not isinstance(sep, basestring): raise saytypeerror(sep, 'sep')
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64 if not isinstance(end, basestring): raise saytypeerror(end, 'end')
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65 file.write(sep.join(map(str, values)) + end)
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67 try:
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68 from os.path import relpath
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69 except ImportError:
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70 # Python 2.5
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71 import os.path as _path
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72
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73 # Adapted from Python 2.7.1
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74
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75 if hasattr(_path, 'splitunc'):
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76 def _abspath_split(path):
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77 abs = _path.abspath(_path.normpath(path))
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78 prefix, rest = _path.splitunc(abs)
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79 is_unc = bool(prefix)
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80 if not is_unc:
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81 prefix, rest = _path.splitdrive(abs)
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82 return is_unc, prefix, [x for x in rest.split(_path.sep) if x]
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83 else:
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84 def _abspath_split(path):
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85 prefix, rest = _path.splitdrive(_path.abspath(_path.normpath(path)))
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86 return False, prefix, [x for x in rest.split(_path.sep) if x]
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87
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88 def relpath(path, start=_path.curdir):
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89 """Return a relative version of a path"""
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90
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91 if not path:
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92 raise ValueError("no path specified")
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93
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94 start_is_unc, start_prefix, start_list = _abspath_split(start)
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95 path_is_unc, path_prefix, path_list = _abspath_split(path)
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96
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97 if path_is_unc ^ start_is_unc:
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98 raise ValueError("Cannot mix UNC and non-UNC paths (%s and %s)"
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99 % (path, start))
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100 if path_prefix.lower() != start_prefix.lower():
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101 if path_is_unc:
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102 raise ValueError("path is on UNC root %s, start on UNC root %s"
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103 % (path_prefix, start_prefix))
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104 else:
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105 raise ValueError("path is on drive %s, start on drive %s"
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106 % (path_prefix, start_prefix))
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107 # Work out how much of the filepath is shared by start and path.
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108 i = 0
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109 for e1, e2 in zip(start_list, path_list):
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110 if e1.lower() != e2.lower():
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111 break
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112 i += 1
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113
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114 rel_list = [_path.pardir] * (len(start_list)-i) + path_list[i:]
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115 if not rel_list:
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116 return _path.curdir
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117 return _path.join(*rel_list)
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118
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119 _path.relpath = relpath
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120
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121 def import_urllib():
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122 try:
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123 # Python 3
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124 import urllib.request
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125 return urllib.request, lambda url: urllib.request.urlopen(url).read().decode()
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126 except ImportError:
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127 # Python 2
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128 import urllib
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129 return urllib, lambda url: urllib.urlopen(url).read()
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130
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131 try:
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132 from abc import ABCMeta, abstractmethod
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133 except ImportError:
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134 ABCMeta, abstractmethod = None, lambda x: x
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135
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136 # In all of the following, the try clause is for Python 2 and the except
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137 # clause is for Python 3. More checks are performed than needed
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138 # for standard builds of Python to ensure as much as possible works
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139 # on custom builds.
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140 try:
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141 basestring = basestring
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142 except NameError:
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143 basestring = str
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144
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145 try:
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146 range = xrange
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147 except NameError:
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148 range = range
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149
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150 try:
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151 callable = callable
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152 except NameError:
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153 callable = lambda obj: hasattr(obj, '__call__')
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154
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155 try:
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156 next = next
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157 except NameError:
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158 next = lambda obj: obj.next()
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159
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160 try:
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161 from itertools import imap as map
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162 except ImportError:
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163 map = map
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164
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165 try:
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166 from itertools import izip as zip
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167 except ImportError:
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168 zip = zip
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169
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170 try:
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171 from itertools import ifilter as filter
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172 except ImportError:
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173 filter = filter
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174
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175 items = dict.iteritems if hasattr(dict, 'iteritems') else dict.items
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176 keys = dict.iterkeys if hasattr(dict, 'iterkeys') else dict.keys
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177 values = dict.itervalues if hasattr(dict, 'itervalues') else dict.values
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178
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179 try:
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180 # Python 3
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181 from itertools import zip_longest
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182 except ImportError:
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183 try:
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184 # Python 2.6/2.7
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185 from itertools import izip_longest as zip_longest
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186 except ImportError:
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187 # Python 2.5
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188 from itertools import chain, repeat
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189 # Adapted from the documentation of itertools.izip_longest
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190 def zip_longest(*args, **kwargs):
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191 fillvalue = kwargs.get('fillvalue')
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192 def sentinel(counter=([fillvalue]*(len(args)-1)).pop):
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193 yield counter()
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194 fillers = repeat(fillvalue)
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195 iters = [chain(it, sentinel(), fillers) for it in args]
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196 try:
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197 for tup in zip(*iters):
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198 yield tup
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199 except IndexError:
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200 pass
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201
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202 # Automatically import * from this module into testconf.py's
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203 class CompatBuiltins(object):
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204 __slots__ = 'originals'
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205 def __init__(self):
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206 self.originals = {}
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207 def __enter__(self):
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208 g = globals()
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209 for name in __all__:
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210 if hasattr(builtins, name):
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211 self.originals[name] = getattr(builtins, name)
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212 setattr(builtins, name, g[name])
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213 def __exit__(self, exc_type, exc_val, exc_tb):
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214 for name in self.originals:
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215 setattr(builtins, name, self.originals[name])
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216
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217 # Support simple testconf.py's written for test.py 1.x
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218 builtins.xrange = range