Re: [xml] How to extend the Reader interface with a dup() function

[Nanning Buitenhuis <nanning elvenkind com>]

> > I want to extend the Reader interface with a dup() function.
> > That is, make a new reader with the same state as the current
> > reader, so a trial run over the data is possible.
> >
> > Possible, impossible, or pointers?
>
>   Would require special code in the xmlreader.c . Seems really hard
> anyway for example if you feed the data from a socket. So In general
> it sounds like too hard to make reliable and it't better to reuse 
> the Reader for the same stream again.
>
> Daniel

That would make the calling code overly complex.
In certain circumstances (XSL-FO parsing) I need to scan ahead and
then continue from the original point onwards. The documents are
-potentially- far to big to be stored in core, and rescanning to
my current position would be ugly.

I would not mind at all if the dup() would only work for files and
return NULL for other input streams. Later, perhaps, I could extend
it to other streams.

Or did you have something else in mind when you said
  "it't better to reuse the Reader for the same stream again."
?

Regards,
  NaN.