Re: Is there a way to change the way Pandoc parses HTML inside of markdown documents?

[John MacFarlane <jgm-TVLZxgkOlNX2fBVCVOL8/A@public.gmane.org>]

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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