Re:[xslt] debugger callbacks
- From: Keith Isdale <k_isdale tpg com au>
- To: Kasimier Buchcik <kbuchcik 4commerce de>
- Cc: xslt gnome org
- Subject: Re:[xslt] debugger callbacks
- Date: Thu, 16 Oct 2003 02:48:36 +1000
Have you set xslDebugStatus to something other than XSLT_DEBUG_NONE, see
<libxslt/xsltutils.h>. You may find you can get the information that you
want using xsldbg :-).
------
Known cavates for the debugger callback functions are:
o Be careful if you are modifing the data XSLT engine data structures during
a debugging step as you could put the tranformation engine into a bad state
and give misleading resuilts.
o Be aware that the callbacks may not be in the same order as you would read
the text source for the XSLT script.
o The XSLT pre-processing step will remove certain redundant nodes, such as
comment nodes, from the XSLT script before main work of XSLT transformation
is done.
o Line number information may or may not be available for any given XmlNode
due to optimizations done during the pre-processing step
o Whilst the xslAddCall and xslDropCall are always done in pairs the call
stack depth can get over stated. This is because transformation of some XSLT
commands, for example xsl:for-each, increase the call stack depth otherwise
there would be no way to know how to "break out" of the for loop.
------
Daniel: Maybe these cavates could be added to the libxslt FAQ. I had trouble
when I did a search on xslDebugStatus in the XSLT API. And I was suprised
to get a "Error 404" when pointing my browser at
http://xmlsoft.org/XSLT/XSLT/html/libxslt-transform.html#XSLHANDLEDEBUGGER
as suggested by the "xslHandleDebugger" link resulting from pointing my
browser at
http://xmlsoft.org/XSLT/search.php?query=xslDebugStatus+&submit=Search+...
(URL tested on Mozilla and Konqueror).
Kasimier wrote;
> I tried to use xsltSetDebuggerCallbacks to get some callbacks during the=20
> transformation, but the registered functions are not called. Since a=20
> call of xslAddCall, fires the registered callback, I assume that=20
> xsltDebuggerCurrentCallbacks is correctly initialized.
> I guess libxslt (version see below) was compiled with WITH_DEBUGGER.
--
Keith Isdale
http://sourceforge.net.projects/xsldbg | xsldbg helping understand
stylesheets
http://xsldbg.sourceforge.net
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