[lxml-dev] How to access XSLT Parameters Inside an Extension Function?

[Stefan Behnel]

Hi,

Thomas Schraitle wrote:
> I use the DocBook stylesheets very much in combination with xsltproc. 
> However, xsltproc doesn't support the DocBook extension functions. These 
> create line numbers, get the size of a graphic, etc. You know, these sort 
> of things that are very difficult or impossible to deal with XSLT. The 
> problem is these extension functions are only implemented for Saxon or 
> Xalan.
> 
> Well, my idea was to write these in lxml. To do this, I have to stick with 
> the number of arguments, unless I change the DocBook stylesheets. My 
> dream would be to have a kind of a wrapper for xsltproc which implements 
> the extension function.

What about this (totally untested) code snippet:

    class DocBoocXSLT(XSLT):
        def __init__(self, xslt_input):
            extensions = {("ns", "myfunc1") : self.myfunc1}
            XSLT.__init__(self, xslt_input, extensions = extensions)

        def myfunc1(self, ctxt, a, b, c):
            param = self.parameters["someparam"]
            ...

        def __call__(self, *args, **kwargs):
            self.parameters = kwargs
            return XSLT.__call__(self, *args, **kwargs)

Stefan