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

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 ()
    again it works with a set of 4 callbacks:

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.


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