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119 lines
4.5 KiB
119 lines
4.5 KiB
.. _codec-registry:
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Codec registry and support functions
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====================================
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.. c:function:: int PyCodec_Register(PyObject *search_function)
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Register a new codec search function.
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As side effect, this tries to load the :mod:`encodings` package, if not yet
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done, to make sure that it is always first in the list of search functions.
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.. c:function:: int PyCodec_KnownEncoding(const char *encoding)
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Return ``1`` or ``0`` depending on whether there is a registered codec for
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the given *encoding*.
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.. c:function:: PyObject* PyCodec_Encode(PyObject *object, const char *encoding, const char *errors)
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Generic codec based encoding API.
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*object* is passed through the encoder function found for the given
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*encoding* using the error handling method defined by *errors*. *errors* may
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be *NULL* to use the default method defined for the codec. Raises a
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:exc:`LookupError` if no encoder can be found.
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.. c:function:: PyObject* PyCodec_Decode(PyObject *object, const char *encoding, const char *errors)
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Generic codec based decoding API.
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*object* is passed through the decoder function found for the given
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*encoding* using the error handling method defined by *errors*. *errors* may
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be *NULL* to use the default method defined for the codec. Raises a
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:exc:`LookupError` if no encoder can be found.
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Codec lookup API
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----------------
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In the following functions, the *encoding* string is looked up converted to all
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lower-case characters, which makes encodings looked up through this mechanism
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effectively case-insensitive. If no codec is found, a :exc:`KeyError` is set
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and *NULL* returned.
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.. c:function:: PyObject* PyCodec_Encoder(const char *encoding)
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Get an encoder function for the given *encoding*.
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.. c:function:: PyObject* PyCodec_Decoder(const char *encoding)
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Get a decoder function for the given *encoding*.
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.. c:function:: PyObject* PyCodec_IncrementalEncoder(const char *encoding, const char *errors)
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Get an :class:`~codecs.IncrementalEncoder` object for the given *encoding*.
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.. c:function:: PyObject* PyCodec_IncrementalDecoder(const char *encoding, const char *errors)
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Get an :class:`~codecs.IncrementalDecoder` object for the given *encoding*.
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.. c:function:: PyObject* PyCodec_StreamReader(const char *encoding, PyObject *stream, const char *errors)
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Get a :class:`~codecs.StreamReader` factory function for the given *encoding*.
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.. c:function:: PyObject* PyCodec_StreamWriter(const char *encoding, PyObject *stream, const char *errors)
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Get a :class:`~codecs.StreamWriter` factory function for the given *encoding*.
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Registry API for Unicode encoding error handlers
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------------------------------------------------
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.. c:function:: int PyCodec_RegisterError(const char *name, PyObject *error)
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Register the error handling callback function *error* under the given *name*.
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This callback function will be called by a codec when it encounters
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unencodable characters/undecodable bytes and *name* is specified as the error
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parameter in the call to the encode/decode function.
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The callback gets a single argument, an instance of
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:exc:`UnicodeEncodeError`, :exc:`UnicodeDecodeError` or
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:exc:`UnicodeTranslateError` that holds information about the problematic
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sequence of characters or bytes and their offset in the original string (see
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:ref:`unicodeexceptions` for functions to extract this information). The
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callback must either raise the given exception, or return a two-item tuple
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containing the replacement for the problematic sequence, and an integer
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giving the offset in the original string at which encoding/decoding should be
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resumed.
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Return ``0`` on success, ``-1`` on error.
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.. c:function:: PyObject* PyCodec_LookupError(const char *name)
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Lookup the error handling callback function registered under *name*. As a
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special case *NULL* can be passed, in which case the error handling callback
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for "strict" will be returned.
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.. c:function:: PyObject* PyCodec_StrictErrors(PyObject *exc)
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Raise *exc* as an exception.
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.. c:function:: PyObject* PyCodec_IgnoreErrors(PyObject *exc)
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Ignore the unicode error, skipping the faulty input.
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.. c:function:: PyObject* PyCodec_ReplaceErrors(PyObject *exc)
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Replace the unicode encode error with ``?`` or ``U+FFFD``.
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.. c:function:: PyObject* PyCodec_XMLCharRefReplaceErrors(PyObject *exc)
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Replace the unicode encode error with XML character references.
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.. c:function:: PyObject* PyCodec_BackslashReplaceErrors(PyObject *exc)
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Replace the unicode encode error with backslash escapes (``\x``, ``\u`` and
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``\U``).
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