Could pandoc.read(markup, "html")
<https://pandoc.org/lua-filters.html#pandoc.read> help?

On Mon, 16 Aug 2021 at 23:09, John MacFarlane <jgm-TVLZxgkOlNX2fBVCVOL8/A@public.gmane.org> wrote:

>
> I'm afraid you'll have to write some parsing code...
>
> pompez <martinsifrar11-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:
>
> > I'm starting out with Lua filters and apologize for this possibly
> already
> > answered question. You can also read this question on StackOverflow
> > <
> https://stackoverflow.com/questions/68809527/is-there-a-way-to-change-the-way-pandoc-parses-html-inside-of-markdown-documents
> >
> > .
> >
> > I'm using Pandoc to convert markdown to HTML. My markdown files also
> > contain some raw HTML. In the examples, I'll be using `<mark>` and `<u>`.
> >
> > Let's say I want to change every `<mark>` to a `<u>` tag. We parse the
> > input as HTML and look at the AST.
> >
> > ```
> > $ echo '<u>foo</u> & <mark>bar</mark>' | pandoc --from=html --to native
> > [Plain [Underline [Str "foo"],Space,Str "&",Space,Span ("", ["mark"],[])
> > [Str "bar"]]]
> > ```
> >
> > On this structure, we can use a simple filter which replaces `Span`
> > elements representing the `<mark>` tag and replaces with `Underline`
> > elements.
> >
> > ```
> > function Span(elem)
> >     if elem.classes[1]:gmatch('mark') then
> >         return pandoc.Underline(elem.content)
> >     end
> > end
> > ```
> >
> > ```
> > [Plain [Underline [Str "foo"],Space,Str "&",Space,Underline [Str "bar"]]]
> > ```
> >
> > This is good. But if we parse the same input as markdown, we get a much
> > less convenient structure.
> >
> > ```
> > $ echo '<u>foo</u> & <mark>bar</mark>' | pandoc --from=markdown+raw_html
> > --to native
> > [Para [RawInline (Format "html") "<u>",Str "foo",RawInline (Format
> "html")
> > "</u>",Space,Str "&",Space,RawInline (Format "html") "<mark>",Str
> > "bar",RawInline (Format "html") "</mark>"]]
> > ```
> >
> > And if we had some additional criteria by which to replace `<mark>` with
> > `<u>` (the content for example), we would have to identify the opening
> and
> > closing `RawInline` elements.
> >
> > I'm wondering if there is any good solutions to this problem? Is there a
> > way to parse HTML in markdown just as HTML would be parsed otherwise? Or
> is
> > there way to solve this in a Lua filter without writing some parsing
> code?
> >
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