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annotate planemo/lib/python3.7/site-packages/future/utils/surrogateescape.py @ 0:d30785e31577 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:18:57 -0400
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1 """
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2 This is Victor Stinner's pure-Python implementation of PEP 383: the "surrogateescape" error
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3 handler of Python 3.
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4
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5 Source: misc/python/surrogateescape.py in https://bitbucket.org/haypo/misc
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6 """
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7
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8 # This code is released under the Python license and the BSD 2-clause license
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9
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10 import codecs
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11 import sys
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12
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13 from future import utils
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14
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15
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16 FS_ERRORS = 'surrogateescape'
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17
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18 # # -- Python 2/3 compatibility -------------------------------------
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19 # FS_ERRORS = 'my_surrogateescape'
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20
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21 def u(text):
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22 if utils.PY3:
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23 return text
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24 else:
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25 return text.decode('unicode_escape')
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26
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27 def b(data):
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28 if utils.PY3:
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29 return data.encode('latin1')
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30 else:
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31 return data
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32
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33 if utils.PY3:
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34 _unichr = chr
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35 bytes_chr = lambda code: bytes((code,))
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36 else:
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37 _unichr = unichr
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38 bytes_chr = chr
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39
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40 def surrogateescape_handler(exc):
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41 """
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42 Pure Python implementation of the PEP 383: the "surrogateescape" error
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43 handler of Python 3. Undecodable bytes will be replaced by a Unicode
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44 character U+DCxx on decoding, and these are translated into the
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45 original bytes on encoding.
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46 """
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47 mystring = exc.object[exc.start:exc.end]
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48
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49 try:
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50 if isinstance(exc, UnicodeDecodeError):
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51 # mystring is a byte-string in this case
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52 decoded = replace_surrogate_decode(mystring)
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53 elif isinstance(exc, UnicodeEncodeError):
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54 # In the case of u'\udcc3'.encode('ascii',
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55 # 'this_surrogateescape_handler'), both Python 2.x and 3.x raise an
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56 # exception anyway after this function is called, even though I think
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57 # it's doing what it should. It seems that the strict encoder is called
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58 # to encode the unicode string that this function returns ...
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59 decoded = replace_surrogate_encode(mystring)
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60 else:
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61 raise exc
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62 except NotASurrogateError:
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63 raise exc
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64 return (decoded, exc.end)
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65
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66
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67 class NotASurrogateError(Exception):
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68 pass
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69
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70
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71 def replace_surrogate_encode(mystring):
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72 """
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73 Returns a (unicode) string, not the more logical bytes, because the codecs
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74 register_error functionality expects this.
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75 """
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76 decoded = []
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77 for ch in mystring:
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78 # if utils.PY3:
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79 # code = ch
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80 # else:
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81 code = ord(ch)
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82
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83 # The following magic comes from Py3.3's Python/codecs.c file:
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84 if not 0xD800 <= code <= 0xDCFF:
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85 # Not a surrogate. Fail with the original exception.
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86 raise NotASurrogateError
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87 # mybytes = [0xe0 | (code >> 12),
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88 # 0x80 | ((code >> 6) & 0x3f),
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89 # 0x80 | (code & 0x3f)]
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90 # Is this a good idea?
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91 if 0xDC00 <= code <= 0xDC7F:
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92 decoded.append(_unichr(code - 0xDC00))
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93 elif code <= 0xDCFF:
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94 decoded.append(_unichr(code - 0xDC00))
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95 else:
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96 raise NotASurrogateError
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97 return str().join(decoded)
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98
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99
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100 def replace_surrogate_decode(mybytes):
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101 """
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102 Returns a (unicode) string
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103 """
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104 decoded = []
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105 for ch in mybytes:
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106 # We may be parsing newbytes (in which case ch is an int) or a native
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107 # str on Py2
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108 if isinstance(ch, int):
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109 code = ch
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110 else:
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111 code = ord(ch)
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112 if 0x80 <= code <= 0xFF:
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113 decoded.append(_unichr(0xDC00 + code))
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114 elif code <= 0x7F:
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115 decoded.append(_unichr(code))
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116 else:
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117 # # It may be a bad byte
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118 # # Try swallowing it.
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119 # continue
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120 # print("RAISE!")
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121 raise NotASurrogateError
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122 return str().join(decoded)
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123
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124
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125 def encodefilename(fn):
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126 if FS_ENCODING == 'ascii':
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127 # ASCII encoder of Python 2 expects that the error handler returns a
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128 # Unicode string encodable to ASCII, whereas our surrogateescape error
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129 # handler has to return bytes in 0x80-0xFF range.
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130 encoded = []
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131 for index, ch in enumerate(fn):
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132 code = ord(ch)
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133 if code < 128:
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134 ch = bytes_chr(code)
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135 elif 0xDC80 <= code <= 0xDCFF:
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136 ch = bytes_chr(code - 0xDC00)
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137 else:
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138 raise UnicodeEncodeError(FS_ENCODING,
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139 fn, index, index+1,
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140 'ordinal not in range(128)')
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141 encoded.append(ch)
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142 return bytes().join(encoded)
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143 elif FS_ENCODING == 'utf-8':
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144 # UTF-8 encoder of Python 2 encodes surrogates, so U+DC80-U+DCFF
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145 # doesn't go through our error handler
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146 encoded = []
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147 for index, ch in enumerate(fn):
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148 code = ord(ch)
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149 if 0xD800 <= code <= 0xDFFF:
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150 if 0xDC80 <= code <= 0xDCFF:
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151 ch = bytes_chr(code - 0xDC00)
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152 encoded.append(ch)
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153 else:
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154 raise UnicodeEncodeError(
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155 FS_ENCODING,
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156 fn, index, index+1, 'surrogates not allowed')
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157 else:
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158 ch_utf8 = ch.encode('utf-8')
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159 encoded.append(ch_utf8)
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160 return bytes().join(encoded)
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161 else:
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162 return fn.encode(FS_ENCODING, FS_ERRORS)
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163
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164 def decodefilename(fn):
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165 return fn.decode(FS_ENCODING, FS_ERRORS)
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166
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167 FS_ENCODING = 'ascii'; fn = b('[abc\xff]'); encoded = u('[abc\udcff]')
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168 # FS_ENCODING = 'cp932'; fn = b('[abc\x81\x00]'); encoded = u('[abc\udc81\x00]')
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169 # FS_ENCODING = 'UTF-8'; fn = b('[abc\xff]'); encoded = u('[abc\udcff]')
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170
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171
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172 # normalize the filesystem encoding name.
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173 # For example, we expect "utf-8", not "UTF8".
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174 FS_ENCODING = codecs.lookup(FS_ENCODING).name
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175
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176
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177 def register_surrogateescape():
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178 """
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179 Registers the surrogateescape error handler on Python 2 (only)
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180 """
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181 if utils.PY3:
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182 return
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183 try:
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184 codecs.lookup_error(FS_ERRORS)
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185 except LookupError:
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186 codecs.register_error(FS_ERRORS, surrogateescape_handler)
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187
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188
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189 if __name__ == '__main__':
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190 pass
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191 # # Tests:
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192 # register_surrogateescape()
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193
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194 # b = decodefilename(fn)
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195 # assert b == encoded, "%r != %r" % (b, encoded)
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196 # c = encodefilename(b)
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197 # assert c == fn, '%r != %r' % (c, fn)
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198 # # print("ok")