Re: [xml] accessing Parser-Ctxt in SAX based schema validation

[Holger Kaelberer <hkaelber math uni-bielefeld de>]

Hi Daniel.


Daniel Veillard wrote:

> > But what do I set my state->ctxt  to (supposed to be a xmlParserCtxtPtr) 
> > as I don't have the parser-Ctxt of the parsed xml-file? I first thought 
> > of passing the xmlSchemaValidCtxtPtr and than using vctxt->parserCtxt in 
> > my SAX-handler, but that does not work as the parserCtxt-element is not 
> > "public".
> >     
>
>   Hum, right one would need to add an accessor function at the end of
> xmlschemas.c ... 

Ok, the attached patch does the job.

> But what are you using the parser context for, i'm curious ?
>   

So far only for accessing line numbers in the parsed xml-file, when 
printing error message for content checks. May be I can get around these 
messages by using the planed schema validation. But then I'm running in 
another problem:

With Sax based schema validation enabled I don't get line-numbers 
printed out for validity errors when using the default output handler 
for validation errors  -- which makes the output not very useful!.  Why?

When I try to work around this by attaching some other handler using 
xmlSchemaSetValidErrors I also do need access to the parserCtxt 
encapsulated in the schemaValidContextPtr. With the changes made by the 
supplied patch I get it working this way.

Is there any other way for accessing line numbers in the parsed xml? If 
no, any chance to get the patch included in the distribution?

Thanks,
 Holger

diff -r libxml2-2.6.31/include/libxml/xmlschemas.h libxml2-2.6.31-hk/include/libxml/xmlschemas.h
180a181,183
> XMLPUBFUN xmlParserCtxtPtr XMLCALL
>       xmlSchemaValidCtxtGetParserCtxt(xmlSchemaValidCtxtPtr ctxt);
diff -r libxml2-2.6.31/xmlschemas.c libxml2-2.6.31-hk/xmlschemas.c
28670a28671,28684
> /**
>  * xmlSchemaValidCtxtGetParserCtxt:
>  * @ctxt: a schema validation context
>  *
>  * Return the parser context of the schema validation context passed.
>  *
>  * Returns the parser context of the schema validation context passed
>  */
> inline xmlParserCtxtPtr
> xmlSchemaValidCtxtGetParserCtxt(xmlSchemaValidCtxtPtr ctxt)
> {
>       return (ctxt->parserCtxt);
> }