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- # Source Generated with Decompyle++
- # File: in.pyc (Python 2.3)
-
- ''' Standard "encodings" Package
-
- Standard Python encoding modules are stored in this package
- directory.
-
- Codec modules must have names corresponding to normalized encoding
- names as defined in the normalize_encoding() function below, e.g.
- \'utf-8\' must be implemented by the module \'utf_8.py\'.
-
- Each codec module must export the following interface:
-
- * getregentry() -> (encoder, decoder, stream_reader, stream_writer)
- The getregentry() API must return callable objects which adhere to
- the Python Codec Interface Standard.
-
- In addition, a module may optionally also define the following
- APIs which are then used by the package\'s codec search function:
-
- * getaliases() -> sequence of encoding name strings to use as aliases
-
- Alias names returned by getaliases() must be normalized encoding
- names as defined by normalize_encoding().
-
- Written by Marc-Andre Lemburg (mal@lemburg.com).
-
- (c) Copyright CNRI, All Rights Reserved. NO WARRANTY.
-
- '''
- import codecs
- import exceptions
- import types
- _cache = { }
- _unknown = '--unknown--'
- _import_tail = [
- '*']
- _norm_encoding_map = ' . 0123456789 ABCDEFGHIJKLMNOPQRSTUVWXYZ abcdefghijklmnopqrstuvwxyz '
-
- class CodecRegistryError(exceptions.LookupError, exceptions.SystemError):
- pass
-
-
- def normalize_encoding(encoding):
- """ Normalize an encoding name.
-
- Normalization works as follows: all non-alphanumeric
- characters except the dot used for Python package names are
- collapsed and replaced with a single underscore, e.g. ' -;#'
- becomes '_'. Leading and trailing underscores are removed.
-
- Note that encoding names should be ASCII only; if they do use
- non-ASCII characters, these must be Latin-1 compatible.
-
- """
- if type(encoding) is types.UnicodeType:
- encoding = encoding.encode('latin-1')
-
- return '_'.join(encoding.translate(_norm_encoding_map).split())
-
-
- def search_function(encoding):
- entry = _cache.get(encoding, _unknown)
- if entry is not _unknown:
- return entry
-
- modname = normalize_encoding(encoding)
-
- try:
- mod = __import__('encodings.' + modname, globals(), locals(), _import_tail)
- except ImportError:
- import aliases
- if not aliases.aliases.get(modname) and aliases.aliases.get(modname.replace('.', '_')):
- pass
- modname = modname
-
- try:
- mod = __import__(modname, globals(), locals(), _import_tail)
- except ImportError:
- mod = None
- except:
- None<EXCEPTION MATCH>ImportError
-
-
- None<EXCEPTION MATCH>ImportError
-
-
- try:
- getregentry = mod.getregentry
- except AttributeError:
- mod = None
-
- if mod is None:
- _cache[encoding] = None
- return None
-
- entry = tuple(getregentry())
- if len(entry) != 4:
- raise CodecRegistryError, 'module "%s" (%s) failed to register' % (mod.__name__, mod.__file__)
-
- for obj in entry:
- if not callable(obj):
- raise CodecRegistryError, 'incompatible codecs in module "%s" (%s)' % (mod.__name__, mod.__file__)
- continue
-
- _cache[encoding] = entry
-
- try:
- codecaliases = mod.getaliases()
- except AttributeError:
- pass
-
- import aliases
- for alias in codecaliases:
- if not aliases.aliases.has_key(alias):
- aliases.aliases[alias] = modname
- continue
-
- return entry
-
- codecs.register(search_function)
-