author | Gareth Stockwell <gareth.stockwell@accenture.com> |
Wed, 22 Sep 2010 20:10:53 +0100 | |
branch | graphics-phase-3 |
changeset 113 | b842c0cb760e |
parent 1 | 2fb8b9db1c86 |
permissions | -rw-r--r-- |
1
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1 |
""" Standard "encodings" Package |
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2 |
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Standard Python encoding modules are stored in this package |
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4 |
directory. |
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5 |
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Codec modules must have names corresponding to normalized encoding |
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names as defined in the normalize_encoding() function below, e.g. |
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'utf-8' must be implemented by the module 'utf_8.py'. |
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9 |
|
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Each codec module must export the following interface: |
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11 |
|
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* getregentry() -> codecs.CodecInfo object |
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The getregentry() API must a CodecInfo object with encoder, decoder, |
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14 |
incrementalencoder, incrementaldecoder, streamwriter and streamreader |
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atttributes which adhere to the Python Codec Interface Standard. |
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16 |
|
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In addition, a module may optionally also define the following |
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APIs which are then used by the package's codec search function: |
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19 |
|
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* getaliases() -> sequence of encoding name strings to use as aliases |
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21 |
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Alias names returned by getaliases() must be normalized encoding |
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names as defined by normalize_encoding(). |
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24 |
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Written by Marc-Andre Lemburg (mal@lemburg.com). |
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26 |
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(c) Copyright CNRI, All Rights Reserved. NO WARRANTY. |
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28 |
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"""#" |
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30 |
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import codecs |
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from encodings import aliases |
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import __builtin__ |
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34 |
|
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_cache = {} |
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_unknown = '--unknown--' |
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_import_tail = ['*'] |
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_norm_encoding_map = (' . ' |
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'0123456789 ABCDEFGHIJKLMNOPQRSTUVWXYZ ' |
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' abcdefghijklmnopqrstuvwxyz ' |
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' ' |
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' ' |
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' ') |
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_aliases = aliases.aliases |
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45 |
|
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class CodecRegistryError(LookupError, SystemError): |
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47 |
pass |
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48 |
|
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def normalize_encoding(encoding): |
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50 |
|
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""" Normalize an encoding name. |
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52 |
|
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Normalization works as follows: all non-alphanumeric |
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characters except the dot used for Python package names are |
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collapsed and replaced with a single underscore, e.g. ' -;#' |
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becomes '_'. Leading and trailing underscores are removed. |
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57 |
|
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Note that encoding names should be ASCII only; if they do use |
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non-ASCII characters, these must be Latin-1 compatible. |
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60 |
|
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61 |
""" |
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# Make sure we have an 8-bit string, because .translate() works |
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# 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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# 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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# Import is absolute to prevent the possibly malicious import of a |
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# 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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Initial QEMU (symbian-qemu-0.9.1-12) import
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110 |
except AttributeError: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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111 |
# Not a codec module |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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112 |
mod = None |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
113 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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114 |
if mod is None: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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115 |
# Cache misses |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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116 |
_cache[encoding] = None |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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117 |
return None |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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118 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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119 |
# Now ask the module for the registry entry |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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120 |
entry = getregentry() |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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121 |
if not isinstance(entry, codecs.CodecInfo): |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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122 |
if not 4 <= len(entry) <= 7: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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123 |
raise CodecRegistryError,\ |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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124 |
'module "%s" (%s) failed to register' % \ |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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125 |
(mod.__name__, mod.__file__) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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126 |
if not callable(entry[0]) or \ |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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127 |
not callable(entry[1]) or \ |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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128 |
(entry[2] is not None and not callable(entry[2])) or \ |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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129 |
(entry[3] is not None and not callable(entry[3])) or \ |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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130 |
(len(entry) > 4 and entry[4] is not None and not callable(entry[4])) or \ |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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|
131 |
(len(entry) > 5 and entry[5] is not None and not callable(entry[5])): |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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|
132 |
raise CodecRegistryError,\ |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
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|
133 |
'incompatible codecs in module "%s" (%s)' % \ |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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|
134 |
(mod.__name__, mod.__file__) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
135 |
if len(entry)<7 or entry[6] is None: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
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|
136 |
entry += (None,)*(6-len(entry)) + (mod.__name__.split(".", 1)[1],) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
137 |
entry = codecs.CodecInfo(*entry) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
138 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
139 |
# Cache the codec registry entry |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
140 |
_cache[encoding] = entry |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
141 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
142 |
# Register its aliases (without overwriting previously registered |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
143 |
# aliases) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
144 |
try: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
145 |
codecaliases = mod.getaliases() |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
146 |
except AttributeError: |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
147 |
pass |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
148 |
else: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
149 |
for alias in codecaliases: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
150 |
if not _aliases.has_key(alias): |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
151 |
_aliases[alias] = modname |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
152 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
153 |
# Return the registry entry |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
154 |
return entry |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
155 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
156 |
# Register the search_function in the Python codec registry |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
157 |
codecs.register(search_function) |