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Change the treatment of positions returned by PEP293

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error handers in the Unicode codecs: Negative
positions are treated as being relative to the end of
the input and out of bounds positions result in an
IndexError.

Also update the PEP and include an explanation of
this in the documentation for codecs.register_error.

Fixes a small bug in iconv_codecs: if the position
from the callback is negative *add* it to the size
instead of substracting it.

From SF patch #677429.
This commit is contained in:
Walter Dörwald 2003-01-31 17:19:08 +00:00
parent f7f4517fae
commit 2e0b18af30
5 changed files with 122 additions and 41 deletions
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21
Doc/lib/libcodecs.tex
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@ -103,11 +103,22 @@ Raises a \exception{LookupError} in case the encoding cannot be found.
Register the error handling function \var{error_handler} under the
name \var{name}. \var{error_handler} will be called during encoding
and decoding in case of an error, when \var{name} is specified as the
errors parameter. \var{error_handler} will be called with an
\exception{UnicodeEncodeError}, \exception{UnicodeDecodeError} or
\exception{UnicodeTranslateError} instance and must return a tuple
with a replacement for the unencodable/undecodable part of the input
and a position where encoding/decoding should continue.
errors parameter.
For encoding \var{error_handler} will be called with a
\exception{UnicodeEncodeError} instance, which contains information about
the location of the error. The error handler must either raise this or
a different exception or return a tuple with a replacement for the
unencodable part of the input and a position where encoding should
continue. The encoder will encode the replacement and continue encoding
the original input at the specified position. Negative position values
will be treated as being relative to the end of the input string. If the
resulting position is out of bound an IndexError will be raised.
Decoding and translating works similar, except \exception{UnicodeDecodeError}
or \exception{UnicodeTranslateError} will be passed to the handler and
that the replacement from the error handler will be put into the output
directly.
\end{funcdesc}
\begin{funcdesc}{lookup_error}{name}

2
Doc/lib/libfuncs.tex
View file

@ -572,7 +572,7 @@ class C:
\var{classinfo} argument, or of a (direct or indirect) subclass
thereof. Also return true if \var{classinfo} is a type object and
\var{object} is an object of that type. If \var{object} is not a
class instance or a object of the given type, the function always
class instance or an object of the given type, the function always
returns false. If \var{classinfo} is neither a class object nor a
type object, it may be a tuple of class or type objects, or may
recursively contain other such tuples (other sequence types are not