Re: Lua Filter: Get to parent of current element?

[ThomasH <therch-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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Great, thanks both of you, I get the idea, will try that.

T.

On Wednesday, May 10, 2023 at 5:08:06 PM UTC+2 Albert Krewinkel wrote:

>
> ThomasH <the...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:
>
> > is there a way to get to the parent in the Pandoc AST from the
> > current element in a Lua filter?
> > I would like to distinguish treatment of elements depending on their
> > context in the syntax tree, e.g. handle a 'span' element differently
> > if it is a child of a 'cell' element in a table.
>
> This is currently not supported in Lua; panflute (Python) filters do
> enable that though.
>
> What Lua does support though is to change the order in which elements
> are traversed, as well as the option to stop processing of a subtree.
> See https://pandoc.org/lua-filters.html#traversal-order
>
> E.g., to handle all Spans in a table differently you'd use
>
> traverse = 'topdown'
>
> function Table (tbl)
> return tbl:walk(my_filter_for_table_spans), false
> end
>
> function Span (span)
> -- default span processing
> return span
> end
>
> It's a bit of a brain-twister (and can be slower than normal filters)
> but it enables most of the actions that one would otherwise use the
> parent element for.
>
>
> -- 
> Albert Krewinkel
> GPG: 8eed e3e2 e8c5 6f18 81fe e836 388d c0b2 1f63 1124
>

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