Re: [xslt] Extension Function Implementation

[Nick Wellnhofer <wellnhofer aevum de>]

You have to create and register a "result value tree" by calling xsltCreateRVT 
and xsltRegisterLocalRVT, then add the nodes you want to return to that tree. 
Have a look at functions like exsltStrTokenizeFunction to see how it works:

    https://gitlab.gnome.org/GNOME/libxslt/-/blob/master/libexslt/strings.c

Hope that helps,
Nick


On 05/10/2021 12:30, Андрей Олешкевич via xslt wrote:
> I am trying to create an xslt extension function for libxslt (c++). My 
> extension function takes a string as input, then this string is parsed by xml 
> parser, and the function returns this parsed xml. I return value by this 
> expression:
>
> void fnParse(xmlXPathParserContextPtr ctx, int nargs) { ... 
> xmlXPathReturnNodeSet(ctx, xmlXPathNodeSetCreate(node)); }
>
> But I have found that libxslt does not free node memory after use. It free 
> xmlNodeSet, but not free the node which is stored in this nodeset. Perhaps I 
> missed something important. What is the correct way to return an XML node in 
> the extension function?