Mercurial > repos > yating-l > jbrowsearchivecreator

annotate test/lib/python2.7/encodings/__init__.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
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1 """ Standard "encodings" Package
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2
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3 Standard Python encoding modules are stored in this package
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4 directory.
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6 Codec modules must have names corresponding to normalized encoding
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7 names as defined in the normalize_encoding() function below, e.g.
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8 'utf-8' must be implemented by the module 'utf_8.py'.
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10 Each codec module must export the following interface:
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12 * getregentry() -> codecs.CodecInfo object
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13 The getregentry() API must a CodecInfo object with encoder, decoder,
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14 incrementalencoder, incrementaldecoder, streamwriter and streamreader
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15 atttributes which adhere to the Python Codec Interface Standard.
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17 In addition, a module may optionally also define the following
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18 APIs which are then used by the package's codec search function:
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20 * getaliases() -> sequence of encoding name strings to use as aliases
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22 Alias names returned by getaliases() must be normalized encoding
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23 names as defined by normalize_encoding().
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25 Written by Marc-Andre Lemburg (mal@lemburg.com).
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27 (c) Copyright CNRI, All Rights Reserved. NO WARRANTY.
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29 """#"
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31 import codecs
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32 from encodings import aliases
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33 import __builtin__
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35 _cache = {}
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36 _unknown = '--unknown--'
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37 _import_tail = ['*']
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38 _norm_encoding_map = (' . '
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39 '0123456789 ABCDEFGHIJKLMNOPQRSTUVWXYZ '
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40 ' abcdefghijklmnopqrstuvwxyz '
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41 ' '
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42 ' '
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43 ' ')
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44 _aliases = aliases.aliases
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45
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46 class CodecRegistryError(LookupError, SystemError):
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47 pass
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49 def normalize_encoding(encoding):
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50
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51 """ Normalize an encoding name.
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52
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53 Normalization works as follows: all non-alphanumeric
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54 characters except the dot used for Python package names are
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55 collapsed and replaced with a single underscore, e.g. ' -;#'
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56 becomes '_'. Leading and trailing underscores are removed.
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57
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58 Note that encoding names should be ASCII only; if they do use
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59 non-ASCII characters, these must be Latin-1 compatible.
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61 """
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62 # Make sure we have an 8-bit string, because .translate() works
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63 # differently for Unicode strings.
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64 if hasattr(__builtin__, "unicode") and isinstance(encoding, unicode):
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65 # Note that .encode('latin-1') does *not* use the codec
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66 # registry, so this call doesn't recurse. (See unicodeobject.c
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67 # PyUnicode_AsEncodedString() for details)
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68 encoding = encoding.encode('latin-1')
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69 return '_'.join(encoding.translate(_norm_encoding_map).split())
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70
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71 def search_function(encoding):
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72
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73 # Cache lookup
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74 entry = _cache.get(encoding, _unknown)
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75 if entry is not _unknown:
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76 return entry
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77
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78 # Import the module:
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79 #
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80 # First try to find an alias for the normalized encoding
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81 # name and lookup the module using the aliased name, then try to
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82 # lookup the module using the standard import scheme, i.e. first
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83 # try in the encodings package, then at top-level.
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84 #
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85 norm_encoding = normalize_encoding(encoding)
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86 aliased_encoding = _aliases.get(norm_encoding) or \
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87 _aliases.get(norm_encoding.replace('.', '_'))
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88 if aliased_encoding is not None:
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89 modnames = [aliased_encoding,
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90 norm_encoding]
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91 else:
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92 modnames = [norm_encoding]
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93 for modname in modnames:
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94 if not modname or '.' in modname:
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95 continue
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96 try:
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97 # Import is absolute to prevent the possibly malicious import of a
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98 # module with side-effects that is not in the 'encodings' package.
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99 mod = __import__('encodings.' + modname, fromlist=_import_tail,
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100 level=0)
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101 except ImportError:
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102 pass
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103 else:
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104 break
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105 else:
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106 mod = None
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107
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108 try:
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109 getregentry = mod.getregentry
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110 except AttributeError:
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111 # Not a codec module
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112 mod = None
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113
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114 if mod is None:
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115 # Cache misses
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116 _cache[encoding] = None
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117 return None
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118
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119 # Now ask the module for the registry entry
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120 entry = getregentry()
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121 if not isinstance(entry, codecs.CodecInfo):
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122 if not 4 <= len(entry) <= 7:
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123 raise CodecRegistryError,\
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124 'module "%s" (%s) failed to register' % \
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125 (mod.__name__, mod.__file__)
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126 if not hasattr(entry[0], '__call__') or \
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127 not hasattr(entry[1], '__call__') or \
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128 (entry[2] is not None and not hasattr(entry[2], '__call__')) or \
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129 (entry[3] is not None and not hasattr(entry[3], '__call__')) or \
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130 (len(entry) > 4 and entry[4] is not None and not hasattr(entry[4], '__call__')) or \
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131 (len(entry) > 5 and entry[5] is not None and not hasattr(entry[5], '__call__')):
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132 raise CodecRegistryError,\
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133 'incompatible codecs in module "%s" (%s)' % \
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134 (mod.__name__, mod.__file__)
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135 if len(entry)<7 or entry[6] is None:
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136 entry += (None,)*(6-len(entry)) + (mod.__name__.split(".", 1)[1],)
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137 entry = codecs.CodecInfo(*entry)
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138
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139 # Cache the codec registry entry
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140 _cache[encoding] = entry
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141
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142 # Register its aliases (without overwriting previously registered
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143 # aliases)
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144 try:
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145 codecaliases = mod.getaliases()
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146 except AttributeError:
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147 pass
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148 else:
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149 for alias in codecaliases:
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150 if alias not in _aliases:
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151 _aliases[alias] = modname
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152
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153 # Return the registry entry
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154 return entry
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155
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156 # Register the search_function in the Python codec registry
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157 codecs.register(search_function)