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Edit File : __init__.py \| Size : 4.95 KB
""" 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() -> codecs.CodecInfo object The getregentry() API must return a CodecInfo object with encoder, decoder, incrementalencoder, incrementaldecoder, streamwriter and streamreader atttributes 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 from . import aliases _cache = {} _unknown = '--unknown--' _import_tail = [''] _aliases = aliases.aliases class CodecRegistryError(LookupError, 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 isinstance(encoding, bytes): encoding = str(encoding, "ascii") chars = [] punct = False for c in encoding: if c.isalnum() or c == '.': if punct and chars: chars.append('_') chars.append(c) punct = False else: punct = True return ''.join(chars) def search_function(encoding): # Cache lookup entry = _cache.get(encoding, _unknown) if entry is not _unknown: return entry # Import the module: # # First try to find an alias for the normalized encoding # name and lookup the module using the aliased name, then try to # lookup the module using the standard import scheme, i.e. first # try in the encodings package, then at top-level. # norm_encoding = normalize_encoding(encoding) aliased_encoding = _aliases.get(norm_encoding) or \ _aliases.get(norm_encoding.replace('.', '_')) if aliased_encoding is not None: modnames = [aliased_encoding, norm_encoding] else: modnames = [norm_encoding] for modname in modnames: if not modname or '.' in modname: continue try: # Import is absolute to prevent the possibly malicious import of a # module with side-effects that is not in the 'encodings' package. mod = __import__('encodings.' + modname, fromlist=_import_tail, level=0) except ImportError: pass else: break else: mod = None try: getregentry = mod.getregentry except AttributeError: # Not a codec module mod = None if mod is None: # Cache misses _cache[encoding] = None return None # Now ask the module for the registry entry entry = getregentry() if not isinstance(entry, codecs.CodecInfo): if not 4 <= len(entry) <= 7: raise CodecRegistryError('module "%s" (%s) failed to register' % (mod.__name__, mod.__file__)) if not callable(entry[0]) or not callable(entry[1]) or \ (entry[2] is not None and not callable(entry[2])) or \ (entry[3] is not None and not callable(entry[3])) or \ (len(entry) > 4 and entry[4] is not None and not callable(entry[4])) or \ (len(entry) > 5 and entry[5] is not None and not callable(entry[5])): raise CodecRegistryError('incompatible codecs in module "%s" (%s)' % (mod.__name__, mod.__file__)) if len(entry)<7 or entry[6] is None: entry += (None,)(6-len(entry)) + (mod.__name__.split(".", 1)[1],) entry = codecs.CodecInfo(*entry) # Cache the codec registry entry _cache[encoding] = entry # Register its aliases (without overwriting previously registered # aliases) try: codecaliases = mod.getaliases() except AttributeError: pass else: for alias in codecaliases: if alias not in _aliases: _aliases[alias] = modname # Return the registry entry return entry # Register the search_function in the Python codec registry codecs.register(search_function) Back

Edit File : __init__.py | Size : 4.95 KB

""" 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() -> codecs.CodecInfo object
    The getregentry() API must return a CodecInfo object with encoder, decoder,
    incrementalencoder, incrementaldecoder, streamwriter and streamreader
    atttributes 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).

"""#"

import codecs
from . import aliases

_cache = {}
_unknown = '--unknown--'
_import_tail = ['*']
_aliases = aliases.aliases

class CodecRegistryError(LookupError, 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 isinstance(encoding, bytes):
        encoding = str(encoding, "ascii")
    chars = []
    punct = False
    for c in encoding:
        if c.isalnum() or c == '.':
            if punct and chars:
                chars.append('_')
            chars.append(c)
            punct = False
        else:
            punct = True
    return ''.join(chars)

def search_function(encoding):

# Cache lookup
    entry = _cache.get(encoding, _unknown)
    if entry is not _unknown:
        return entry

# Import the module:
    #
    # First try to find an alias for the normalized encoding
    # name and lookup the module using the aliased name, then try to
    # lookup the module using the standard import scheme, i.e. first
    # try in the encodings package, then at top-level.
    #
    norm_encoding = normalize_encoding(encoding)
    aliased_encoding = _aliases.get(norm_encoding) or \
                       _aliases.get(norm_encoding.replace('.', '_'))
    if aliased_encoding is not None:
        modnames = [aliased_encoding,
                    norm_encoding]
    else:
        modnames = [norm_encoding]
    for modname in modnames:
        if not modname or '.' in modname:
            continue
        try:
            # Import is absolute to prevent the possibly malicious import of a
            # module with side-effects that is not in the 'encodings' package.
            mod = __import__('encodings.' + modname, fromlist=_import_tail,
                             level=0)
        except ImportError:
            pass
        else:
            break
    else:
        mod = None

try:
        getregentry = mod.getregentry
    except AttributeError:
        # Not a codec module
        mod = None

if mod is None:
        # Cache misses
        _cache[encoding] = None
        return None

# Now ask the module for the registry entry
    entry = getregentry()
    if not isinstance(entry, codecs.CodecInfo):
        if not 4 <= len(entry) <= 7:
            raise CodecRegistryError('module "%s" (%s) failed to register'
                                     % (mod.__name__, mod.__file__))
        if not callable(entry[0]) or not callable(entry[1]) or \
           (entry[2] is not None and not callable(entry[2])) or \
           (entry[3] is not None and not callable(entry[3])) or \
           (len(entry) > 4 and entry[4] is not None and not callable(entry[4])) or \
           (len(entry) > 5 and entry[5] is not None and not callable(entry[5])):
            raise CodecRegistryError('incompatible codecs in module "%s" (%s)'
                                     % (mod.__name__, mod.__file__))
        if len(entry)<7 or entry[6] is None:
            entry += (None,)*(6-len(entry)) + (mod.__name__.split(".", 1)[1],)
        entry = codecs.CodecInfo(*entry)

# Cache the codec registry entry
    _cache[encoding] = entry

# Register its aliases (without overwriting previously registered
    # aliases)
    try:
        codecaliases = mod.getaliases()
    except AttributeError:
        pass
    else:
        for alias in codecaliases:
            if alias not in _aliases:
                _aliases[alias] = modname

# Return the registry entry
    return entry

# Register the search_function in the Python codec registry
codecs.register(search_function)

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