Re: [xml] document() and import() handlers

[Matt Sergeant <matt sergeant org>]

On Sun, 11 Mar 2001, Daniel Veillard wrote:

> On Sun, Mar 11, 2001 at 12:18:02PM +0000, Matt Sergeant wrote:
> > On Sun, 11 Mar 2001, Daniel Veillard wrote:
> >
> > >    You can register new handlers, based on the URI string they can intercept
> > > the default I/O routines of libxml:
> > >     use xmlRegisterInputCallbacks ()
> > >     http://xmlsoft.org/html/libxml-xmlio.html#XMLREGISTERINPUTCALLBACKS
> > >     again it works with a set of 4 callbacks:
> > >     match()
> > >     open()
> > >     read()
> > >     close()
> >
> > These methods need to send some sort of user data, otherwise I can't do
> > per-instance callbacks, and I have no way to do matches in Perl-space.
>
>   match() should not need it

It doesn't need it if implementing in C space, but Perl is a dynamic
language, so I want to be able to set the match conditions in Perl space.
Without any sort of context pointer I can't do that (because I have no way
of knowing what Perl sub to call from within C-space).

>   open() returns the user data associated
>   which is passwd as first arg of
>   read() and close()

Even these methods require a context object, for exactly the same reason
as match() - I need a Perl SV * to be able to know what Perl method to
call. Otherwise I have to hard code the method and package name, which is
not nice.

-- 
<Matt/>

    /||    ** Founder and CTO  **  **   http://axkit.com/     **
   //||    **  AxKit.com Ltd   **  ** XML Application Serving **
  // ||    ** http://axkit.org **  ** XSLT, XPathScript, XSP  **
 // \\| // ** mod_perl news and resources: http://take23.org  **
     \\//
     //\\
    //  \\