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- # Source Generated with Decompyle++
- # File: in.pyc (Python 2.2)
-
- ''' Standard "encodings" Package
-
- Standard Python encoding modules are stored in this package
- directory.
-
- Codec modules must have names corresponding to standard lower-case
- encoding names with hyphens mapped to underscores, e.g. \'utf-8\' is
- 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 standard encoding
- names as defined above (lower-case, hyphens converted to
- underscores).
-
- Written by Marc-Andre Lemburg (mal@lemburg.com).
-
- (c) Copyright CNRI, All Rights Reserved. NO WARRANTY.
-
- '''
- import codecs
- import aliases
- import exceptions
- _cache = { }
- _unknown = '--unknown--'
-
- class CodecRegistryError(exceptions.LookupError, exceptions.SystemError):
- pass
-
-
- def search_function(encoding):
- entry = _cache.get(encoding, _unknown)
- if entry is not _unknown:
- return entry
-
- modname = encoding.replace('-', '_')
- modname = aliases.aliases.get(modname, modname)
-
- try:
- mod = __import__(modname, globals(), locals(), '*')
- except ImportError:
- why = None
- _cache[encoding] = None
- return None
-
-
- try:
- entry = tuple(mod.getregentry())
- except AttributeError:
- entry = ()
-
- 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__)
-
-
- _cache[encoding] = entry
-
- try:
- codecaliases = mod.getaliases()
- except AttributeError:
- pass
-
- for alias in codecaliases:
- if not aliases.aliases.has_key(alias):
- aliases.aliases[alias] = modname
-
-
- return entry
-
- codecs.register(search_function)
-