Thanks for clarifying! Reading the docs on filters, if I understand 
correctly the idea is something like this:

    Input => Reader => AST => Filter => AST => Writer => Output

But if I need to write a custom reader anyway, why would I need to encode 
additional transformations in a filter? Couldn't I just encode it into the 
AST when I read it in in the first place?

On Tuesday, March 21, 2023 at 2:31:14 PM UTC+1 Bastien DUMONT wrote:

> Your custom reader can store the required information in divs, spans or 
> attributes (for the elements that support it). Then, when writing to LaTeX, 
> you can use a custom filter to convert this information to LaTeX code.
>
> A word of caution: in your figure, the LaTeX engine comes after Pandoc 
> (Pandoc outputs a TeX file taking account of the custom template; then this 
> TeX file is processed by the LaTeX engine). 
>
> Le Tuesday 21 March 2023 à 05:31:48AM, Matan Bendix Shenhav a écrit :
> > I'm looking to implement a web app which allows users to write articles 
> which
> > automatically get typeset into newspapers. I will be consuming JSON data 
> and
> > want to output PDFs, and want to understand how to provide limited 
> control of
> > element positioning (especially of images) through some sort of layout 
> hooks.
> > 
> > Articles will be written in a simple linear rich-text format, but some 
> limited
> > settings would allow users to control elements of positioning, in 
> particular
> > whether images would appear inline inside a column or blown up to full 
> page
> > width.
> > 
> > Editing is highly contained to keep things simple. Users select a 
> collection of
> > articles and pick their preferred order, and the application can decide 
> the
> > details of how to position them. The output is a section of the 
> newspaper, N
> > pages long, as a PDF.
> > 
> > The web editor will output the content in some sort of JSON format 
> (probably
> > extending [1]this API), but if necessary I can easily convert this into 
> HTML
> > (and indeed, I will have to anyway for the use to view the content in the
> > editor).
> > 
> > If I understand correctly, the Pandoc pipeline should be something like 
> this:
> > 
> > Screenshot from 2023-03-21 13-25-28.png
> > 
> > My main question is about provide element-level hooks to allow to input 
> JSON to
> > influence output layout. As a simple example, let's say the user adds 
> some
> > images into the markup. Some images should be inline, while others 
> should be
> > full page width or even full page.
> > 
> > How do I implement such hooks in this sort of Pandoc pipeline?
> > 
> > Thank you for your time!
> >             
> > 
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> > 
> > References:
> > 
> > [1] https://editorjs.io/base-concepts/#what-is-clean-data
> > [2] mailto:pandoc-discus...-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
> > [3] 
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