From: BPJ <melroch-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: pandoc-discuss <pandoc-discuss-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org>
Subject: Re: Converting filter to custom writer
Date: Wed, 29 Jun 2022 18:23:00 +0200 [thread overview]
Message-ID: <CADAJKhBPpu1=FnxP0byMDWGEBF-7XAV7mVc+TzDSPX2t2GXN=g@mail.gmail.com> (raw)
In-Reply-To: <CADAJKhAyQY_deNGV4SN61jodEM4sLUBSa4zpdxRdXg8+LLMzTA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
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I saw no answer to this one. Hopefully it just got lost.
Apologies to anyone who already got it.
Den fre 24 juni 2022 16:09BPJ <> skrev:
> I have a not-so-old "pseudo-writer" implemented as a filter which mostly
> injects tons of raw markup into the document tree so that the output of
> the plain writer looks like my target format, returning a table of filters
> at the end like this
>
> ``````lua
> return {
> {
> Meta = get_config
> },
> {
> SmallCaps = SmallCaps,
> Str = Str
> },
> note_filter,
> main_filter
> }
> ``````
>
> where `get_config` just extracts some info from the metadata and populates
> a table declared at the top of the script which the functions in the other
> filters refer to.
>
> Am I right that I in principle could convert this into a new style custom
> writer by removing the Meta filter, replacing `return {<filters>}` above
> with `local filters = {<filters>}` and adding the following at the bottom
> of the script?
>
> ``````lua
> function Writer (doc, opts)
> get_config(doc.meta)
> for _,filter in ipairs(filters) do
> doc = doc:walk(filter)
> end
> doc.blocks = blocks
> return pandoc.write(doc, 'plain', opts)
> ``````
>
> (This got me thinking: what if `walk` accepted one more argument which
> will be passed as an extra argument to the functions in the filters, which
> could be used to pass config and/or maintain state? It somehow feels more
> intuitive than defining a table outside the metadata handler which all
> handlers close around.)
>
> (BTW the main reason that the `note_filter` is separate is that it needs
> to be topdown because it counts and collects the notes, while `main_filter`
> needs to be bottomup because it sometimes relies on the content of elements
> already having been processed. I was very happy when I realized that this
> would work!)
>
>
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next prev parent reply other threads:[~2022-06-29 16:23 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-24 14:09 BPJ
[not found] ` <CADAJKhAyQY_deNGV4SN61jodEM4sLUBSa4zpdxRdXg8+LLMzTA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2022-06-29 16:23 ` BPJ [this message]
2022-06-29 17:22 ` Albert Krewinkel
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