From: bapt a <auguieba-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: pandoc-discuss <pandoc-discuss-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org>
Subject: Re: Lua filter to automatically tag keywords for TeX indexing
Date: Fri, 4 Nov 2022 14:26:55 -0700 (PDT) [thread overview]
Message-ID: <23ccfb2a-c458-49e1-a275-dad452f5d2e3n@googlegroups.com> (raw)
In-Reply-To: <ECDE1635-3DD4-4E57-8D66-E546B4742622-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
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Thank you both for the helpful replies; I don't fully understand how these
boolean tables are used in Lua (clearly it works, I just don't fully get
it), but it seems to be an important concept so I'll read up on it.
Thanks,
baptiste
On Friday, 4 November 2022 at 08:39:29 UTC+13 fiddlosopher wrote:
>
>
> > On Nov 2, 2022, at 6:20 PM, bapt a <augu...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> >
> > Hi all,
> >
> > I've started writing a technical book using Quarto markdown, which uses
> pandoc with Lua filters under the hood to produce a website as well as the
> publisher's pdf format (via LaTeX).
> > I quite like to keep the source document as plain as possible, and I'm
> wondering if I could avoid the use of [concept]{.index}, which gets turned
> into \index{concept}, and instead write a Lua filter with my custom list of
> keywords, and have pandoc automatically match them as they appear in the
> text.
> > As a proof of principle I wrote the following code (see below), which
> matches specific keywords, and reformats them as small-caps. I quickly
> realised that trailing punctuation, such as "concept, ..." will fail to
> match, so I'm using gsub to strip such punctuation before matching. It
> works, but I'm a bit worried:
> >
> > - what's the overhead of such a filter, in practice? From what I
> understand, every single string element in the AST will be processed by
> gsub then tested for a match. Are Lua filters walking down the AST fast
> enough that I shouldn't worry about it? (as far as I can tell on small
> examples, it seems fine)
>
> The AST walking is very fast. See the benchmarks at the beginning of
> https://pandoc.org/lua-filters.html for one example.
>
> > - assuming this idea is reasonable, I might want to do a few similar
> operations, e.g. reformatting program languages (as in this example code),
> wrapping keywords in \index{}, etc., and the exact format will often depend
> on the output target (html vs TeX etc.). Is there a better construct for
> this than successive if/else statements to look for matches? (I don't know
> much Lua)
>
> In lua you can do
>
> string.gusb(val, [“(%l*)”], function (word)
> if indexable[word] then
> .. whatever ..
> end
> end)
>
> This will run the function on every group of letters in the matched string.
> Here I’m assuming you have a lua table indexable that maps words to true,
> e.g.
>
> { cow: true, horse: true }
>
> That will be much faster than iterating through an array as you’re doing
> here.
>
>
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prev parent reply other threads:[~2022-11-04 21:26 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-03 1:20 bapt a
[not found] ` <7f570676-2876-4e29-a8c0-9a765617f141n-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org>
2022-11-03 19:18 ` Bastien DUMONT
2022-11-03 19:39 ` John MacFarlane
[not found] ` <ECDE1635-3DD4-4E57-8D66-E546B4742622-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2022-11-04 21:26 ` bapt a [this message]
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