Mercurial > repos > yating-l > jbrowsearchivecreator

annotate test/lib/python2.7/encodings/utf_8_sig.py @ 3:7d1a9a91b989 draft

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planemo upload for repository https://github.com/Yating-L/jbrowse-archive-creator.git commit d583ac16a6c6942730ea536eb59cc37941816030-dirty
author yating-l
date Thu, 18 May 2017 18:37:28 -0400
parents
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Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
3
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1 """ Python 'utf-8-sig' Codec
7d1a9a91b989 planemo upload for repository https://github.com/Yating-L/jbrowse-archive-creator.git commit d583ac16a6c6942730ea536eb59cc37941816030-dirty
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2 This work similar to UTF-8 with the following changes:
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3
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4 * On encoding/writing a UTF-8 encoded BOM will be prepended/written as the
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5 first three bytes.
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6
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7 * On decoding/reading if the first three bytes are a UTF-8 encoded BOM, these
7d1a9a91b989 planemo upload for repository https://github.com/Yating-L/jbrowse-archive-creator.git commit d583ac16a6c6942730ea536eb59cc37941816030-dirty
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8 bytes will be skipped.
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9 """
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10 import codecs
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11
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12 ### Codec APIs
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13
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14 def encode(input, errors='strict'):
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15 return (codecs.BOM_UTF8 + codecs.utf_8_encode(input, errors)[0], len(input))
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16
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17 def decode(input, errors='strict'):
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18 prefix = 0
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19 if input[:3] == codecs.BOM_UTF8:
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20 input = input[3:]
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21 prefix = 3
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22 (output, consumed) = codecs.utf_8_decode(input, errors, True)
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23 return (output, consumed+prefix)
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24
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25 class IncrementalEncoder(codecs.IncrementalEncoder):
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26 def __init__(self, errors='strict'):
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27 codecs.IncrementalEncoder.__init__(self, errors)
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28 self.first = 1
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29
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30 def encode(self, input, final=False):
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31 if self.first:
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32 self.first = 0
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33 return codecs.BOM_UTF8 + codecs.utf_8_encode(input, self.errors)[0]
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34 else:
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35 return codecs.utf_8_encode(input, self.errors)[0]
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36
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37 def reset(self):
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38 codecs.IncrementalEncoder.reset(self)
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39 self.first = 1
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40
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41 def getstate(self):
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42 return self.first
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43
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44 def setstate(self, state):
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45 self.first = state
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46
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47 class IncrementalDecoder(codecs.BufferedIncrementalDecoder):
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48 def __init__(self, errors='strict'):
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49 codecs.BufferedIncrementalDecoder.__init__(self, errors)
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50 self.first = True
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51
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52 def _buffer_decode(self, input, errors, final):
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53 if self.first:
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54 if len(input) < 3:
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55 if codecs.BOM_UTF8.startswith(input):
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56 # not enough data to decide if this really is a BOM
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57 # => try again on the next call
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58 return (u"", 0)
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59 else:
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60 self.first = None
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61 else:
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62 self.first = None
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63 if input[:3] == codecs.BOM_UTF8:
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64 (output, consumed) = codecs.utf_8_decode(input[3:], errors, final)
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65 return (output, consumed+3)
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66 return codecs.utf_8_decode(input, errors, final)
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67
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68 def reset(self):
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69 codecs.BufferedIncrementalDecoder.reset(self)
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70 self.first = True
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71
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72 class StreamWriter(codecs.StreamWriter):
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73 def reset(self):
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74 codecs.StreamWriter.reset(self)
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75 try:
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76 del self.encode
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77 except AttributeError:
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78 pass
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79
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80 def encode(self, input, errors='strict'):
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81 self.encode = codecs.utf_8_encode
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82 return encode(input, errors)
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83
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84 class StreamReader(codecs.StreamReader):
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85 def reset(self):
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86 codecs.StreamReader.reset(self)
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87 try:
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88 del self.decode
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89 except AttributeError:
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90 pass
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91
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92 def decode(self, input, errors='strict'):
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93 if len(input) < 3:
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94 if codecs.BOM_UTF8.startswith(input):
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95 # not enough data to decide if this is a BOM
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96 # => try again on the next call
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97 return (u"", 0)
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98 elif input[:3] == codecs.BOM_UTF8:
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99 self.decode = codecs.utf_8_decode
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100 (output, consumed) = codecs.utf_8_decode(input[3:],errors)
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101 return (output, consumed+3)
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102 # (else) no BOM present
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103 self.decode = codecs.utf_8_decode
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104 return codecs.utf_8_decode(input, errors)
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105
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106 ### encodings module API
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107
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108 def getregentry():
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109 return codecs.CodecInfo(
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110 name='utf-8-sig',
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111 encode=encode,
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112 decode=decode,
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113 incrementalencoder=IncrementalEncoder,
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114 incrementaldecoder=IncrementalDecoder,
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115 streamreader=StreamReader,
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116 streamwriter=StreamWriter,
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117 )