(Ooops probably answered Denis only and not the group. Here we go again!)

AFAICT filters are document AST to AST transformations. In this Python 
library, docs (Pandoc instances) represent this AST, so a typical AST 
(in-place) transform would be:

import pandoc
from pandoc.types import *

def uppercase(doc): 
    for elt in pandoc.iter(doc):
        if isinstance(elt, Str):
            elt[0] = elt[0].upper() # elt: Str(Text)

If you need to make a markdown to markdown transformation instead, you read 
the input markdown, transform it then write it back:

>>> markdown = "Hello world!"
>>> doc = pandoc.read(markdown)
>>> uppercase(doc)
>>> markdown = pandoc.write(doc)
>>> print(markdown)
HELLO WORLD!

There are more examples here:

    https://boisgera.github.io/pandoc/examples/

and a documentation of common patterns here:

    https://boisgera.github.io/pandoc/cookbook/

Cheers, 

Sébastien

Le samedi 4 décembre 2021 à 15:06:10 UTC+1, denis...-NSENcxR/0n0@public.gmane.org a écrit :

> Hi Sebastian
> Looks interesting. But I don't undertake how you'd use that as an 
> alternative to a filter. Can you give an example?
> Denis
>
>
>
> ________________________________________
> Von: pandoc-...-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org <pandoc-...-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org> im Auftrag 
> von Sébastien Boisgérault <sebastien....-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> Gesendet: Samstag, 4. Dezember 2021 14:20:03
> An: pandoc-discuss
> Betreff: Pandoc Document Model in Python
>
> Hi everyone,
>
> I have just released the 2.0 version of a pandoc python library which 
> exposes the Pandoc document model to Python :
>
> https://github.com/boisgera/pandoc#-overview
>
> The main goal is to enable all kinds of analysis, generation and 
> transformation of documents with Python (roughly speaking, an alternative 
> to pandoc filters); it is not to convert from one format to another (it can 
> do it, but so can the standard pandoc command-line tool).
>
> Feedback welcome !
>
> Cheers,
>
> Sébastien
>
>
>
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