Yes, lua filters operate on the AST (abstract syntax tree).

I think that some pre-processing will be necessary because (AFAIK) the Para
(p) element doesn't retain attributes in the AST.

Here's an example using HTML derived from yours (the p element is wrapped
in a div). Note: I think perhaps the lua div logic could be simpler, but
this seems to work.

% cat kursiv.html
<span class="Kursiv">span-text-with-class</span>
<div class="Normal_fett"><p>para-text-class-from-div</p></div>

% pandoc kursiv.html -L kursiv.lua
<em><span>span-text-with-class</span></em>
<div>
<p><strong>para-text-class-from-div</strong></p>
</div>

% cat kursiv.lua
function Span(span)
    local class, index = span.attr.classes:find('Kursiv')
    if class then
        span.attr.classes:remove(index)
        return pandoc.Emph({span})
    end
end

function Div(div)
    local class, index = div.attr.classes:find('Normal_fett')
    if class then
        div.attr.classes:remove(index)
        div.content = div.content:map(
            function(elem)
                elem.content = {pandoc.Strong(elem.content)}
                return elem
            end
        )
        return div
    end
end

On Sat, 25 Jun 2022 at 10:34, Frank Bergmann <pandoc-eSlkCAlw8VwAvxtiuMwx3w@public.gmane.org> wrote:

> Hi,
>
> this time I have some questions.
>
> As far as I understood the lua scripting it is not working on actual
> input but just on already translated native format.
> What I need is to do some "translations" on raw HTML input.
> (BTW - actual output here is asciidoc.)
>
> My issue is that the "HTML" input has a lot of styles like these:
>
> <span class="Kursiv">
> <span class="FettUnterstrichen">
> <p class="Normal_fett">
> <p class="rml10_101__Normal_fett">
> <p class="rml10_112__Normal_fett">
> <p class="rml10_114__Normal_fett">
> <p class="rml10_11__Normal_fett">
> <p class="rml10_122__Normal_fett">
> <p class="rml10_124__Normal_fett">
> <p class="rml10_133__Normal_fett">
> <p class="rml10_136__Normal_fett">
> <p class="rml10_138__Normal_fett">
> <p class="rml10_177__Normal_fett">
> <span class="Fett">
> <span class="FettUnterstrichen">
>
> (Note: kursiv=italic/emphasized, fett=bold, unterstrichen=underline)
>
> Is there a way in pandoc to "translate" styles like e.g. the ones with
> "fett" to e.g. a simple HTML tag "<b>" before internally doing the
> actual translation to native and then to output format?
> Can a lua script be used for this?
> Or do I need to write a translator of my own and run it BEFORE using
> pandoc?
>
> (Note: The "HTML" input is coming from Adobe RoboHelp.)
>
> kind regards,
> Frank
>
> --
> Frank Bergmann, Pödinghauser Str. 5, D-32051 Herford, Tel. +49-5221-9249753
> SAP Hybris & Linux LPIC-3, E-Mail tx2014-VEyjnN4Vo9k@public.gmane.org, USt-IdNr DE237314606
> http://tdyn.de/freel  -- Redirect to profile at freelancermap
> http://www.gulp.de/freiberufler/2HNKY2YHW.html  -- Profile at GULP
>
> --
> You received this message because you are subscribed to the Google Groups
> "pandoc-discuss" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to pandoc-discuss+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
> To view this discussion on the web visit
> https://groups.google.com/d/msgid/pandoc-discuss/c09f254c-5ccf-1ed4-97ab-4e6bccbbdcb6%40tuxad.com
> .
>

-- 
You received this message because you are subscribed to the Google Groups "pandoc-discuss" group.
To unsubscribe from this group and stop receiving emails from it, send an email to pandoc-discuss+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
To view this discussion on the web visit https://groups.google.com/d/msgid/pandoc-discuss/CAEe_xxh02ZZ_HbZS0cPDZ4rWE%2BES5zYJQsa4Uw9_bTBX5aEAVg%40mail.gmail.com.