Re: [xml] strange transformCtxt free-ing problem

[Nic James Ferrier <nferrier tapsellferrier co uk>]

Daniel Veillard <veillard redhat com> writes:

> On Sun, Jan 14, 2007 at 02:40:49PM +0000, Nic James Ferrier wrote:
> > I've got a document loader implemented in python that handles xml or
> > html documents thus:
> >
> >
> >   if re.match("^[a-z]+://.*", url):
> >       cached_file, header = hapi_lib.httputils.url_retrieve(url)
> >       if header["content-type"] == "text/html":
> >            doc = parserContext.htmlCtxtReadFile(cached_file, "UTF8", 0)
> >       else:
> >           # Guess that it's XML
> >           doc = parserContext.ctxtReadFile(cached_file, "UTF8", 0)
> >
> > The HTML works fine until I come to free the transformContext that
> > this is all done within.
> >
> > When I do I get a glibc error and my process segfaults.
>
>   How do you free it ? And what how is that piece of code related to a
> transformContext, I don't see any ?!? A transformation context made from
> a document consumes the XSLT document, if you free it it will die when
> python reclain the transformation context. But I see no relationship to
> HTML or XML parsing of *transformed* document.

The code shown is in the loader.

The loader is set... and then:

- a stylesheet is created, 
- a transformContext is created
- the stylesheet is applied using the transformContext (causing the
  document loader to be called with XML and HTML resources requested) 
- the result is obtained
- the result is serialized to a string
- the result is printed
- the transformContext is freed

and then it segfaults.

It's only the calls to the HTML parsing code that cause the free-ing
of the transformContext to fail.
-- 
Nic Ferrier
http://www.tapsellferrier.co.uk   for all your tapsell ferrier needs