#10468: document Unicode exception creation and access functions.

Doc/c-api/codec.rst

@@ -80,15 +80,13 @@ Registry API for Unicode encoding error handlers
    The callback gets a single argument, an instance of
    :exc:`UnicodeEncodeError`, :exc:`UnicodeDecodeError` or
    :exc:`UnicodeTranslateError` that holds information about the problematic
-   sequence of characters or bytes and their offset in the original string.  The
+   sequence of characters or bytes and their offset in the original string (see
+   :ref:`unicodeexceptions` for functions to extract this information).  The
    callback must either raise the given exception, or return a two-item tuple
    containing the replacement for the problematic sequence, and an integer
    giving the offset in the original string at which encoding/decoding should be
    resumed.
 
-   .. XXX once they are documented, link to PyUnicode*Error access functions
-      to show how to get at the exception properties
-
    Return ``0`` on success, ``-1`` on error.
 
 .. c:function:: PyObject* PyCodec_LookupError(const char *name)

Doc/c-api/exceptions.rst

@@ -496,6 +496,83 @@ Exception Objects
    This steals a reference to *ctx*.
 
 
+.. _unicodeexceptions:
+
+Unicode Exception Objects
+=========================
+
+The following functions are used to create and modify Unicode exceptions from C.
+
+.. c:function:: PyObject* PyUnicodeDecodeError_Create(const char *encoding, const char *object, Py_ssize_t length, Py_ssize_t start, Py_ssize_t end, const char *reason)
+
+   Create a :class:`UnicodeDecodeError` object with the attributes *encoding*,
+   *object*, *length*, *start*, *end* and *reason*.
+
+.. c:function:: PyObject* PyUnicodeEncodeError_Create(const char *encoding, const Py_UNICODE *object, Py_ssize_t length, Py_ssize_t start, Py_ssize_t end, const char *reason)
+
+   Create a :class:`UnicodeEncodeError` object with the attributes *encoding*,
+   *object*, *length*, *start*, *end* and *reason*.
+
+.. c:function:: PyObject* PyUnicodeTranslateError_Create(const Py_UNICODE *object, Py_ssize_t length, Py_ssize_t start, Py_ssize_t end, const char *reason)
+
+   Create a :class:`UnicodeTranslateError` object with the attributes *object*,
+   *length*, *start*, *end* and *reason*.
+
+.. c:function:: PyObject* PyUnicodeDecodeError_GetEncoding(PyObject *exc)
+                PyObject* PyUnicodeEncodeError_GetEncoding(PyObject *exc)
+
+   Return the *encoding* attribute of the given exception object.
+
+.. c:function:: PyObject* PyUnicodeDecodeError_GetObject(PyObject *exc)
+                PyObject* PyUnicodeEncodeError_GetObject(PyObject *exc)
+                PyObject* PyUnicodeTranslateError_GetObject(PyObject *exc)
+
+   Return the *object* attribute of the given exception object.
+
+.. c:function:: int PyUnicodeDecodeError_GetStart(PyObject *exc, Py_ssize_t *start)
+                int PyUnicodeEncodeError_GetStart(PyObject *exc, Py_ssize_t *start)
+                int PyUnicodeTranslateError_GetStart(PyObject *exc, Py_ssize_t *start)
+
+   Get the *start* attribute of the given exception object and place it into
+   *\*start*.  *start* must not be *NULL*.  Return ``0`` on success, ``-1`` on
+   failure.
+
+.. c:function:: int PyUnicodeDecodeError_SetStart(PyObject *exc, Py_ssize_t start)
+                int PyUnicodeEncodeError_SetStart(PyObject *exc, Py_ssize_t start)
+                int PyUnicodeTranslateError_SetStart(PyObject *exc, Py_ssize_t start)
+
+   Set the *start* attribute of the given exception object to *start*.  Return
+   ``0`` on success, ``-1`` on failure.
+
+.. c:function:: int PyUnicodeDecodeError_GetEnd(PyObject *exc, Py_ssize_t *end)
+                int PyUnicodeEncodeError_GetEnd(PyObject *exc, Py_ssize_t *end)
+                int PyUnicodeTranslateError_GetEnd(PyObject *exc, Py_ssize_t *end)
+
+   Get the *end* attribute of the given exception object and place it into
+   *\*end*.  *end* must not be *NULL*.  Return ``0`` on success, ``-1`` on
+   failure.
+
+.. c:function:: int PyUnicodeDecodeError_SetEnd(PyObject *exc, Py_ssize_t end)
+                int PyUnicodeEncodeError_SetEnd(PyObject *exc, Py_ssize_t end)
+                int PyUnicodeTranslateError_SetEnd(PyObject *exc, Py_ssize_t end)
+
+   Set the *end* attribute of the given exception object to *end*.  Return ``0``
+   on success, ``-1`` on failure.
+
+.. c:function:: PyObject* PyUnicodeDecodeError_GetReason(PyObject *exc)
+                PyObject* PyUnicodeEncodeError_GetReason(PyObject *exc)
+                PyObject* PyUnicodeTranslateError_GetReason(PyObject *exc)
+
+   Return the *reason* attribute of the given exception object.
+
+.. c:function:: int PyUnicodeDecodeError_SetReason(PyObject *exc, const char *reason)
+                int PyUnicodeEncodeError_SetReason(PyObject *exc, const char *reason)
+                int PyUnicodeTranslateError_SetReason(PyObject *exc, const char *reason)
+
+   Set the *reason* attribute of the given exception object to *reason*.  Return
+   ``0`` on success, ``-1`` on failure.
+
+
 Recursion Control
 =================