Re: [xml] Progressive parsing

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From: Daniel Veillard (Daniel.Veillard@w3.org)
Date: Mon Jul 26 1999 - 11:48:54 EDT

On Fri, Jul 23, 1999 at 08:00:56PM -0400, Daniel Veillard wrote:
>
> Hi Michael,
>
> > Does libxml provide any support for progressive parsing, or will it in the
> > near future? I believe this issue has arisen before, but I am unsure of
> > its current status. What I am looking for is the capability to stream in
> > XML from a socket or other "slow" medium, hand each chunk to libxml as
> > they come in, and receive SAX callbacks as the data is parsed. Currently
> > the entrypoints appear to require an entire document to parse at once, and
> > the only C or C++ library I can find with this kind of functionality is
> > expat, which is awkward for other reasons. I'm assuming others would also
> > desire such a feature, would it be unwise to begin using libxml on the
> > assumption of progressive parsing being implemented over the next few
> > months?
>
> Yes, that's definitely in my TODO list, but it has been there for some
> time now <grin/>
> I cannot promises any hard deadline on libxml coding unfortunately,
> but i definitely support it. Switching to progressive parsing need a bit
> of rework of the parser internals (to move some state from the call stack to
> the parser context), it's definitely in scope and I already worked toward
> this in the past.

  Ok, I spent some time this w.e. on this issue, and committed a version
of libxml using progressive parsing, it's currently on the W3C cvs base
at
  http://dev.w3.org/cgi-bin/cvsweb/XML/

To get it:

  CVSROOT=:pserver:anonymous@dev.w3.org:/sources/public
  export CVSROOT
  cvs login
  passwd: anonymous
  cvs -z3 get XML

I will commit it to the gnome CVS as soon as I will have a bit more
of testing on it.
 Note that now a piece of text may generate multiple SAX.character()
callbacks, it's inherent to having a progressive parser ...

Daniel 

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