[Mod-xml-general] The realloc question

[Nick K. <ni...@we...>]

On Tue, 7 May 2002, Philipp Dunkel wrote:

> 3rd I have no idea what you are talking about with the callback concept. The
> problem remains that before parsing transforming I need the entire document
> in one buffer, otherwise I won't get a DOM-like structure that I can pass to
> the tranformation.

What I had in mind was to build the Doctree using a progressive parse,
as the mod_xml main handler does (if you select a DOM parser).  This
avoids the thorny realloc/or equivalent problem.

I have not managed to do that for XSLT.  However, I have come to
the view that the realloc has to go, so I've updated mod_xml to do:

(1) If Content-length is set, we use that to alloc a memory buffer in one.
(2) If Content-Length is not available, we use a tempfile.

A possible future enhancement would be to allow this choice to be
controlled by configuration options, though I'd still prefer a
progressive parse.

To accompany that, we have a couple of optimisations:
(3) If the main parser is used, it can pass a doctree to the XSLT
    filter, which will then omit the parse altogether
(4) (not yet done) A main handler for static XML docs, that will
    shortcircuit the normal process and have the XSLT parser read
    the XML doc in the manner of a main handler.

I have not yet checked in this lot, but since it addresses one important
issue we've been debating I thought it worth running by you!

Regards,

-- 
Nick Kew