Re: [xml] Aborting html sax parsing from python

[Stefan Seefeld <seefeld sympatico ca>]

Daniel Veillard wrote:

>   Okay so the exception unwinds though the C code.
> Seems though that there is a lot of work to get all cases covered,
> needs to modify the handler. 

Hmm, right. As these handlers don't return anything, may be it would
be better to reserve such a fail-bit in the context object that is being
passed around with each call ?

> What happen in case of multithreaded apps ? the global variable is a
> potentially serious problem if you do a complex setup.

The global exception variable is part of the python runtime, so let python
care for it. :-)
(That's what python's internal 'Global Interpreter Lock' is used for.)

> > The critical thing is thus to check for callback failure. There is nothing 
> > special
> > you have to do to pass the exception through, since both the callbacks and 
> > the application
> > code share the same python runtime, i.e. see the same state that stores the 
> > exception
> > somewhere.
>
>
>   This doesn't look that easy to implement right, there is a number of
> pitfall I believe. I won't have time to do this in the foreseable future, but
> if you want to work on it, I take patches :-)

Fair enough.

Regards,
                Stefan