Re: [xml] Obtaining xpath expression original value

[Agustín Villena <avillena tutopia com>]

Mmmm. The XPaths are dynamically compiled (i guess) since, they are used to
pass arguments to xsl extension functions.

I'll study testXPath.c

Thanks
    Agustin

----- Original Message ----- 
From: "Daniel Veillard" <veillard redhat com>
To: "Agustín Villena" <avillena tutopia com>
Cc: <xml gnome org>
Sent: Friday, April 16, 2004 11:43 AM
Subject: Re: [xml] Obtaining xpath expression original value


> On Fri, Apr 16, 2004 at 11:14:29AM -0400, Agustín Villena wrote:
> > Hi!
> >     I'm using libxml2.6.2, Nad I'm working in a framework to easily
program xslt extensions in c++.
> > I'm trying to report if an argument is invalid (for example, if an xpath
expression returns a invalid type of argumnet, i.e. expecting one string and
receiving a subtree). Obtaining the original xpath expresion would be great
> > (for example: "/root/tree/firstnode is not of type boolean")(
> >
> > void xslFunctionCallback(xmlXPathParserContextPtr ctxt, int nargs)
> >
> > in libxml source code, two fields of xmlXPathParserContext struct would
have this info
> > const xmlChar *cur;   /* the current char being parsed */
> > const xmlChar *base;   /* the full expression */
> >
> > Nevertheless, cur and base are always NULL...
> >
> > I'm missing something important?
>
>   Confusing... The XPath expression you're trying to examine comes from
the
> stylesheet or is it something you dynamically compiled ?
>   In the first case you can't find errors, if there is an error the
stylesheet
> compilation will fail. You will get the element, andf you can lookup
> the attribute hosting the expression.
>   In the second case look at testXPath.c from the distribution it does
> this kind of error reporting.
>
> Daniel
>
> -- 
> Daniel Veillard      | Red Hat Desktop team http://redhat.com/
> veillard redhat com  | libxml GNOME XML XSLT toolkit  http://xmlsoft.org/
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