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webencodings
~~~~~~~~~~~~
This is a Python implementation of the `WHATWG Encoding standard
`. See README for details.
:copyright: Copyright 2012 by Simon Sapin
:license: BSD, see LICENSE for details.
)unicode_literalsN )LABELSz0.5.1z
iso-8859-8z mac-cyrillicz mac-romancp874)z iso-8859-8-izx-mac-cyrillic macintoshz windows-874c C s | d dS )a9 Transform (only) ASCII letters to lower case: A-Z is mapped to a-z.
:param string: An Unicode string.
:returns: A new Unicode string.
This is used for `ASCII case-insensitive
`_
matching of encoding labels.
The same matching is also used, among other things,
for `CSS keywords `_.
This is different from the :meth:`~py:str.lower` method of Unicode strings
which also affect non-ASCII characters,
sometimes mapping them into the ASCII range:
>>> keyword = u'Bac\N{KELVIN SIGN}ground'
>>> assert keyword.lower() == u'background'
>>> assert ascii_lower(keyword) != keyword.lower()
>>> assert ascii_lower(keyword) == u'bac\N{KELVIN SIGN}ground'
utf8)encodelowerdecode)string r C/usr/lib/python3/dist-packages/pip/_vendor/webencodings/__init__.py ascii_lower# s r c C sx t | d} t| }|du rdS t|}|du r:|dkr&ddlm} n t||}t |}t
||}|t|< |S )u<
Look for an encoding by its label.
This is the spec’s `get an encoding
`_ algorithm.
Supported labels are listed there.
:param label: A string.
:returns:
An :class:`Encoding` object, or :obj:`None` for an unknown label.
z
Nzx-user-definedr )
codec_info) r stripr getCACHEx_user_definedr PYTHON_NAMEScodecslookupEncoding)labelnameencodingr python_namer r r
r = s
r c C s. t | dr| S t| }|du rtd| |S )z
Accept either an encoding object or label.
:param encoding: An :class:`Encoding` object or a label string.
:returns: An :class:`Encoding` object.
:raises: :exc:`~exceptions.LookupError` for an unknown label.
r NzUnknown encoding label: %r)hasattrr LookupError)encoding_or_labelr r r r
_get_encoding[ s
r c @ s e Zd ZdZdd Zdd ZdS )r aO Reresents a character encoding such as UTF-8,
that can be used for decoding or encoding.
.. attribute:: name
Canonical name of the encoding
.. attribute:: codec_info
The actual implementation of the encoding,
a stdlib :class:`~codecs.CodecInfo` object.
See :func:`codecs.register`.
c C s || _ || _d S N)r r )selfr r r r r
__init__| s
zEncoding.__init__c C s
d| j S )Nz
)r )r! r r r
__repr__ s
zEncoding.__repr__N)__name__
__module__ __qualname____doc__r" r# r r r r
r m s r zutf-8zutf-16lezutf-16bereplacec C s2 t |}t| \}} |p
|}|j| |d |fS )a
Decode a single string.
:param input: A byte string
:param fallback_encoding:
An :class:`Encoding` object or a label string.
The encoding to use if :obj:`input` does note have a BOM.
:param errors: Type of error handling. See :func:`codecs.register`.
:raises: :exc:`~exceptions.LookupError` for an unknown encoding label.
:return:
A ``(output, encoding)`` tuple of an Unicode string
and an :obj:`Encoding`.
r )r _detect_bomr r
)inputfallback_encodingerrors bom_encodingr r r r
r
s r
c C sV | dr
t| dd fS | drt| dd fS | dr't| dd fS d| fS )zBReturn (bom_encoding, input), with any BOM removed from the input.s Ns s )
startswith_UTF16LE_UTF16BEUTF8)r* r r r
r) s
r) strictc C s t |j| |d S )a;
Encode a single string.
:param input: An Unicode string.
:param encoding: An :class:`Encoding` object or a label string.
:param errors: Type of error handling. See :func:`codecs.register`.
:raises: :exc:`~exceptions.LookupError` for an unknown encoding label.
:return: A byte string.
r )r r r )r* r r, r r r
r s r c C s$ t ||}t| |}t|}||fS )a
"Pull"-based decoder.
:param input:
An iterable of byte strings.
The input is first consumed just enough to determine the encoding
based on the precense of a BOM,
then consumed on demand when the return value is.
:param fallback_encoding:
An :class:`Encoding` object or a label string.
The encoding to use if :obj:`input` does note have a BOM.
:param errors: Type of error handling. See :func:`codecs.register`.
:raises: :exc:`~exceptions.LookupError` for an unknown encoding label.
:returns:
An ``(output, encoding)`` tuple.
:obj:`output` is an iterable of Unicode strings,
:obj:`encoding` is the :obj:`Encoding` that is being used.
)IncrementalDecoder_iter_decode_generatornext)r* r+ r, decoder generatorr r r r
iter_decode s
r: c c s |j }t| } | D ]}||}|r"|jdusJ |jV |V nq
|ddd}|jdus0J |jV |r9|V dS | D ] }||}|rH|V q=|ddd}|rV|V dS dS )zqReturn a generator that first yields the :obj:`Encoding`,
then yields output chukns as Unicode strings.
N Tfinal)r
iterr )r* r8 r
chunckoutputr r r
r6 s4
r6 c C s t ||j}t| |S )uY
“Pull”-based encoder.
:param input: An iterable of Unicode strings.
:param encoding: An :class:`Encoding` object or a label string.
:param errors: Type of error handling. See :func:`codecs.register`.
:raises: :exc:`~exceptions.LookupError` for an unknown encoding label.
:returns: An iterable of byte strings.
)IncrementalEncoderr _iter_encode_generator)r* r r, r r r r
iter_encode s
rC c c s< | D ] }||}|r|V q|ddd}|r |V d S d S )N Tr< r )r* r r? r@ r r r
rB s
rB c @ s$ e Zd ZdZd ddZd
ddZdS ) r5 uO
“Push”-based decoder.
:param fallback_encoding:
An :class:`Encoding` object or a label string.
The encoding to use if :obj:`input` does note have a BOM.
:param errors: Type of error handling. See :func:`codecs.register`.
:raises: :exc:`~exceptions.LookupError` for an unknown encoding label.
r( c C s& t || _|| _d| _d | _d | _d S )Nr; )r _fallback_encoding_errors_buffer_decoderr )r! r+ r, r r r
r" s
zIncrementalDecoder.__init__Fc C s| | j }|dur |||S | j| }t|\}}|du r+t|dk r(|s(|| _dS | j}|j| jj}|| _ || _ |||S )zDecode one chunk of the input.
:param input: A byte string.
:param final:
Indicate that no more input is available.
Must be :obj:`True` if this is the last call.
:returns: An Unicode string.
Nr/ rD )
rH rG r) lenrE r incrementaldecoderrF r
r )r! r* r= r8 r r r r
r
' s
zIncrementalDecoder.decodeNr( )F)r$ r% r& r' r" r
r r r r
r5 s
r5 c @ s e Zd ZdZedfddZdS )rA u
“Push”-based encoder.
:param encoding: An :class:`Encoding` object or a label string.
:param errors: Type of error handling. See :func:`codecs.register`.
:raises: :exc:`~exceptions.LookupError` for an unknown encoding label.
.. method:: encode(input, final=False)
:param input: An Unicode string.
:param final:
Indicate that no more input is available.
Must be :obj:`True` if this is the last call.
:returns: A byte string.
r4 c C s t |}|j|j| _d S r )r r incrementalencoderr )r! r r, r r r
r" T s zIncrementalEncoder.__init__N)r$ r% r& r' r3 r" r r r r
rA C s rA rK )r'
__future__r r labelsr VERSIONr r r r r objectr r3 r1 r2 r
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