Mercurial > repos > guerler > springsuite

annotate planemo/lib/python3.7/site-packages/rdflib/py3compat.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 """
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2 Utility functions and objects to ease Python 3 compatibility.
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3 """
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4 import sys
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5 import re
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6 import codecs
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7 import warnings
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8
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9 try:
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10 from functools import wraps
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11 assert wraps
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12 except ImportError:
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13 # No-op wraps decorator
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14 def wraps(f):
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15 def dec(newf):
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16 return newf
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17 return dec
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18
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19
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20 def cast_bytes(s, enc='utf-8'):
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21 if isinstance(s, str):
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22 return s.encode(enc)
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23 return s
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24
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25 PY3 = (sys.version_info[0] >= 3)
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26
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27
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28 def _modify_str_or_docstring(str_change_func):
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29 @wraps(str_change_func)
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30 def wrapper(func_or_str):
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31 if isinstance(func_or_str, str):
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32 func = None
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33 doc = func_or_str
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34 else:
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35 func = func_or_str
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36 doc = func.__doc__
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37
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38 doc = str_change_func(doc)
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39
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40 if func:
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41 func.__doc__ = doc
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42 return func
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43 return doc
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44 return wrapper
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45
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46
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47 if PY3:
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48 # Python 3:
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49 # ---------
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50 def b(s):
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51 return s.encode('ascii')
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52
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53 def ascii(stream):
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54 return codecs.getreader('ascii')(stream)
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55
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56 def bopen(*args, **kwargs):
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57 return open(*args, mode = 'rb', **kwargs)
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58
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59 bytestype = bytes
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60
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61 # Abstract u'abc' syntax:
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62 @_modify_str_or_docstring
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63 def format_doctest_out(s):
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64 """Python 2 version
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65 "%(u)s'abc'" --> "'abc'"
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66 "%(b)s'abc'" --> "b'abc'"
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67 "55%(L)s" --> "55"
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68 "unicode(x)" --> "str(x)"
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69
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70 Accepts a string or a function, so it can be used as a decorator."""
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71 # s may be None if processed by Py2exe
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72 if s is None:
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73 return ''
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74 return s % {'u': '', 'b': 'b', 'L': '', 'unicode': 'str'}
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75
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76 def type_cmp(a, b):
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77 """Python 2 style comparison based on type"""
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78 ta, tb = type(a).__name__, type(b).__name__
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79 # Ugly hack: some tests rely on tuple sorting before unicode, and I
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80 # don't know if that's important. Better retain it for now.
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81 if ta == 'str':
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82 ta = 'unicode'
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83 if tb == 'str':
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84 tb = 'unicode'
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85 # return 1 if ta > tb else -1 if ta < tb else 0
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86 if ta > tb:
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87 return 1
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88 elif ta < tb:
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89 return -1
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90 else:
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91 return 0
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92
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93 def sign(n):
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94 if n < 0:
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95 return -1
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96 if n > 0:
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97 return 1
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98 return 0
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99
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100 else:
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101 # Python 2
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102 # --------
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103 def b(s):
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104 return s
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105
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106 def ascii(stream):
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107 return stream
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108
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109 bopen = open
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110
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111 bytestype = str
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112
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113 # Abstract u'abc' syntax:
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114 @_modify_str_or_docstring
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115 def format_doctest_out(s):
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116 """Python 2 version
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117 "%(u)s'abc'" --> "u'abc'"
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118 "%(b)s'abc'" --> "'abc'"
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119 "55%(L)s" --> "55L"
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120
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121 Accepts a string or a function, so it can be used as a decorator."""
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122 # s may be None if processed by Py2exe
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123 if s is None:
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124 return ''
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125 return s % {'u': 'u', 'b': '', 'L': 'L', 'unicode': 'unicode'}
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126
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127 def type_cmp(a, b):
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128 # return 1 if a > b else -1 if a < b else 0
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129 if a > b:
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130 return 1
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131 elif a < b:
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132 return -1
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133 else:
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134 return 0
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135
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136 def sign(n):
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137 return cmp(n, 0)
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138
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139 r_unicodeEscape = re.compile(r'(\\u[0-9A-Fa-f]{4}|\\U[0-9A-Fa-f]{8})')
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140
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141 def _unicodeExpand(s):
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142 return r_unicodeEscape.sub(lambda m: chr(int(m.group(0)[2:], 16)), s)
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143
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144 narrow_build = False
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145 try:
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146 chr(0x10FFFF)
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147 except ValueError:
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148 narrow_build = True
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149
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150 if narrow_build:
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151 def _unicodeExpand(s):
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152 try:
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153 return r_unicodeEscape.sub(
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154 lambda m: chr(int(m.group(0)[2:], 16)), s)
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155 except ValueError:
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156 warnings.warn(
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157 'Encountered a unicode char > 0xFFFF in a narrow python build. '
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158 'Trying to degrade gracefully, but this can cause problems '
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159 'later when working with the string:\n%s' % s)
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160 return r_unicodeEscape.sub(
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161 lambda m: codecs.decode(m.group(0), 'unicode_escape'), s)
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162
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163
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164 def decodeStringEscape(s):
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165
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166 """
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167 s is byte-string - replace \ escapes in string
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168 """
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169
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170 if not PY3:
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171 s = s.decode('string-escape')
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172 else:
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173 s = s.replace('\\t', '\t')
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174 s = s.replace('\\n', '\n')
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175 s = s.replace('\\r', '\r')
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176 s = s.replace('\\b', '\b')
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177 s = s.replace('\\f', '\f')
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178 s = s.replace('\\"', '"')
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179 s = s.replace("\\'", "'")
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180 s = s.replace('\\\\', '\\')
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181
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182 return s
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183 #return _unicodeExpand(s) # hmm - string escape doesn't do unicode escaping
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184
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185 def decodeUnicodeEscape(s):
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186 """
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187 s is a unicode string
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188 replace \n and \\u00AC unicode escapes
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189 """
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190 if not PY3:
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191 s = s.encode('utf-8').decode('string-escape')
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192 s = _unicodeExpand(s)
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193 else:
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194 s = s.replace('\\t', '\t')
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195 s = s.replace('\\n', '\n')
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196 s = s.replace('\\r', '\r')
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197 s = s.replace('\\b', '\b')
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198 s = s.replace('\\f', '\f')
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199 s = s.replace('\\"', '"')
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200 s = s.replace("\\'", "'")
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201 s = s.replace('\\\\', '\\')
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202
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203 s = _unicodeExpand(s) # hmm - string escape doesn't do unicode escaping
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204
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205 return s