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(c) Copyright CNRI, All Rights Reserved. NO WARRANTY.
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& & & & &r? r c " e Zd ZdZddZddZdS )r a9 Defines the interface for stateless encoders/decoders.
The .encode()/.decode() methods may use different error
handling schemes by providing the errors argument. These
string values are predefined:
'strict' - raise a ValueError error (or a subclass)
'ignore' - ignore the character and continue with the next
'replace' - replace with a suitable replacement character;
Python will use the official U+FFFD REPLACEMENT
CHARACTER for the builtin Unicode codecs on
decoding and '?' on encoding.
'surrogateescape' - replace with private code points U+DCnn.
'xmlcharrefreplace' - Replace with the appropriate XML
character reference (only for encoding).
'backslashreplace' - Replace with backslashed escape sequences.
'namereplace' - Replace with \N{...} escape sequences
(only for encoding).
The set of allowed values can be extended via register_error.
strictc t )a# Encodes the object input and returns a tuple (output
object, length consumed).
errors defines the error handling to apply. It defaults to
'strict' handling.
The method may not store state in the Codec instance. Use
StreamWriter for codecs which have to keep state in order to
make encoding efficient.
The encoder must be able to handle zero length input and
return an empty object of the output object type in this
situation.
NotImplementedErrorr= inputerrorss r> r$ z Codec.encode s
" "!r? c t )a Decodes the object input and returns a tuple (output
object, length consumed).
input must be an object which provides the bf_getreadbuf
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mapped files are examples of objects providing this slot.
errors defines the error handling to apply. It defaults to
'strict' handling.
The method may not store state in the Codec instance. Use
StreamReader for codecs which have to keep state in order to
make decoding efficient.
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rM rO s r> r% z Codec.decode s
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An IncrementalEncoder encodes an input in multiple steps. The input can
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Creates an IncrementalEncoder instance.
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Encodes input and returns the resulting object.
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Resets the encoder to the initial state.
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Return the current state of the encoder.
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Set the current state of the encoder. state must have been
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An IncrementalDecoder decodes an input in multiple steps. The input can
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Create an IncrementalDecoder instance.
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Decode input and returns the resulting object.
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Reset the decoder to the initial state.
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Return the current state of the decoder.
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were passed to decode() that have not yet been converted.
additional_state_info must be a non-negative integer
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and after reset(), getstate() must return (b"", 0).
)r? r rI rE s r> rb zIncrementalDecoder.getstate s xr? c dS )z
Set the current state of the decoder.
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'ignore' - ignore the character and continue with the next
'replace'- replace with a suitable replacement character
'xmlcharrefreplace' - Replace with the appropriate XML
character reference.
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sequences.
'namereplace' - Replace with \N{...} escape sequences.
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register_error.
N)streamrQ r= r rQ s r> rY zStreamWriter.__init__\ s , r? c v | || j \ }}| j | dS )z> Writes the object's contents encoded to self.stream.
N)r$ rQ r write)r= objectrr rt s r> r zStreamWriter.writeu s9 VT[99h $ r? c V | d | dS )z[ Writes the concatenated list of strings to the stream
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r? r c | j || |dk r |dk r| d S d S d S rx r seekr_ r= offsetwhences r> r zStreamWriter.seek sG ((( Q;;6Q;; JJLLLLL ;;;r? c $ || j | S z? Inherit all other methods from the underlying stream.
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parameters are predefined:
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linebufferr s r> rY zStreamReader.__init__ sB $ !%!4!4!6!6 0 r? c t r4 rM rO s r> r% zStreamReader.decode s !!r? Fc * | j r+| j | j | _ d| _ |dk r|} |dk rt | j |k rn|dk r| j }n| j | }| j |z }|sn | || j \ }}np# t $ rc}|rV| |d|j | j \ }}| d } t | dk r n Y d}~nd}~ww xY w||d | _ | xj |z
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size indicates the approximate maximum number of decoded
bytes or code points to read for decoding. The decoder
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-1 indicates to read and decode as much as possible. size
is intended to prevent having to decode huge files in one
step.
If firstline is true, and a UnicodeDecodeError happens
after the first line terminator in the input only the first line
will be returned, the rest of the input will be kept until the
next call to read().
The method should use a greedy read strategy, meaning that
it should read as much data as is allowed within the
definition of the encoding and the given size, e.g. if
optional encoding endings or state markers are available
on the stream, these should be read too.
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k r|dz }|S )z Read one line from the input stream and return the
decoded data.
size, if given, is passed as size argument to the
read() method.
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isinstancestrendswithbytesr ) r= r r linereadsizerr r line0withendline0withoutends r> readlinezStreamReader.readline s ?
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u::>> !8D a5zzA~~ b T_4 */*. +0(T_*D# B # > >q A $Qx "'("5"5u"5"E"Ea"H ?22&*&<&A&A%)&L&L&*o'6DO / + .
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]. ^ r? c T | }| | S )aS Read all lines available on the input stream
and return them as a list.
Line breaks are implemented using the codec's decoder
method and are included in the list entries.
sizehint, if given, is ignored since there is no efficient
way to finding the true end-of-line.
)r r )r= sizehintr rr s r> readlineszStreamReader.readlinesa s# yy{{x(((r? c : d| _ | j | _ d| _ dS )z Resets the codec buffers used for keeping internal state.
Note that no stream repositioning should take place.
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from decoding errors.
r? N)r r r r rE s r> r_ zStreamReader.resetp s 0 r? r c d | j || | dS )zp Set the input stream's current position.
Resets the codec buffers used for keeping state.
Nr r s r> r zStreamReader.seek} s-
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unknownrK c f || _ ||| | _ ||| | _ || _ dS )aR Creates a StreamReaderWriter instance.
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intermediate format (depending on the "decode" codec) and then
written to the underlying stream using an instance of the provided
Writer class.
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a Reader instance and then encoded and returned to the caller.
r rK c || _ || _ || _ ||| | _ ||| | _ || _ dS )a Creates a StreamRecoder instance which implements a two-way
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work on the backend (the data in stream).
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stream must be a file-like object.
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) ) ) ) $* * * * H H H H Hr? r rrK r c | d|vr|dz }t j | || }||S t | }t ||j |j | }||_ |S # | xY w)a Open an encoded file using the given mode and return
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Unicode as well.
If encoding is not None, then the
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encoding specifies the encoding which is to be used for the
file.
errors may be given to define the error handling. It defaults
to 'strict' which causes ValueErrors to be raised in case an
encoding error occurs.
buffering has the same meaning as for the builtin open() API.
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be used.
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attribute is only available if an encoding was specified as
parameter.
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s 3A A2c ||}t | }t | }t | |j |j |j |j | }||_ ||_ |S )a Return a wrapped version of file which provides transparent
encoding translation.
Data written to the wrapped file is decoded according
to the given data_encoding and then encoded to the underlying
file using file_encoding. The intermediate data type
will usually be Unicode but depends on the specified codecs.
Bytes read from the file are decoded using file_encoding and then
passed back to the caller encoded using data_encoding.
If file_encoding is not given, it defaults to data_encoding.
errors may be given to define the error handling. It defaults
to 'strict' which causes ValueErrors to be raised in case an
encoding error occurs.
The returned wrapped file object provides two extra attributes
.data_encoding and .file_encoding which reflect the given
parameters of the same name. The attributes can be used for
introspection by Python programs.
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Ir? c * t | j S )z Lookup up the codec for the given encoding and return
its encoder function.
Raises a LookupError in case the encoding cannot be found.
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s r> r r ( ""r? c * t | j S )z Lookup up the codec for the given encoding and return
its decoder function.
Raises a LookupError in case the encoding cannot be found.
)r r% r. s r> r r r/ r? c P t | j }|t | |S )z Lookup up the codec for the given encoding and return
its IncrementalEncoder class or factory function.
Raises a LookupError in case the encoding cannot be found
or the codecs doesn't provide an incremental encoder.
)r r8 LookupError)r
encoders r> r r , X 1G(### Nr? c P t | j }|t | |S )z Lookup up the codec for the given encoding and return
its IncrementalDecoder class or factory function.
Raises a LookupError in case the encoding cannot be found
or the codecs doesn't provide an incremental decoder.
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decoders r> r! r! r4 r? c * t | j S )z Lookup up the codec for the given encoding and return
its StreamReader class or factory function.
Raises a LookupError in case the encoding cannot be found.
)r r; r. s r> r" r" ( ((r? c * t | j S )z Lookup up the codec for the given encoding and return
its StreamWriter class or factory function.
Raises a LookupError in case the encoding cannot be found.
)r r: r. s r> r# r# r8 r? c + K t | |fi |}| D ] }| | }|r|V | dd }|r|V dS dS )z
Encoding iterator.
Encodes the input strings from the iterator using an IncrementalEncoder.
errors and kwargs are passed through to the IncrementalEncoder
constructor.
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Decoding iterator.
Decodes the input strings from the iterator using an IncrementalDecoder.
errors and kwargs are passed through to the IncrementalDecoder
constructor.
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r? c d | D S )z make_identity_dict(rng) -> dict
Return a dictionary where elements of the rng sequence are
mapped to themselves.
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z&make_identity_dict..< s AAa r? rI )rngs r> make_identity_dictrE 4 s r? c \ i }| D ]\ }}||vr|||< d||< |S )a Creates an encoding map from a decoding map.
If a target mapping in the decoding map occurs multiple
times, then that target is mapped to None (undefined mapping),
causing an exception when encountered by the charmap codec
during translation.
One example where this happens is cp875.py which decodes
multiple character to \u001a.
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