Re: Adding a reader for Cooklang and a question about Megaparsec

[BPJ <bpj-J3H7GcXPSITLoDKTGw+V6w@public.gmane.org>]

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Den tors 19 jan. 2023 10:47Albert Krewinkel <albert+pandoc-9EawChwDxG8hFhg+JK9F0w@public.gmane.org>
skrev:

> Hi Isaac,
>
> Thanks for reaching out!
>
> Isaac Van Doren <ivando5522-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:
>
> > About Cooklang:
> > I am interested in adding a reader to Pandoc for the Cook markdown
> > language. Cooklang is a concise, standardized way to format recipes.
>
> Very interesting! I took a look at Cooklang, it has an appealing
> tool-chain.
>
> > I've written a parser for Cook in Haskell which would be a good
> > start. It complies with the official Cooklang canonical tests.
> >
> > Questions:
> > Currently my parser uses Megaparsec. Do I need to refactor it to use
> > Parsec instead or is it okay to add Megaparsec as a dependency?
>
> I believe that pandoc might switch to megaparsec at some point in the
> future. But I'm afraid that as of now, the parser library should be
> plain ol' parsec.
>
> > Currently my parser uses String instead of Text. Is it necessary for
> > the parser to use Text to be used by Pandoc or could I get away with
> > the reader converting its Text input to String when parsing?
>
> That's probably ok (and not too difficult to change/fix later on).
>
> > Is there anything else I should know before I start working on a PR?
> > Does this seem like a suitable addition to Pandoc?
>
> I think it would be great to have this, but jgm will have to decide.
>
> If you don't want to wait and also like to play with new tools, then one
> way to get fast results would be to write a parser with the LPeg Lua
> library. Pandoc comes with a LPeg and a Lua interpreter included,


For quick stuff the lpeg.re library may be easier than Lpeg proper. It
supports grammars and is also included with pandoc.

http://www.inf.puc-rio.br/~roberto/lpeg/re.html

and
> those can be used to write custom parsers. We've improved support for
> this in pandoc 3, see <https://pandoc.org/custom-readers>.
>
> Cheers,
> Albert
>
> --
> Albert Krewinkel
> GPG: 8eed e3e2 e8c5 6f18 81fe  e836 388d c0b2 1f63 1124
>
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