Lua Filter: How to write a filter function for a Cell of a Table

Lua Filter: How to write a filter function for a Cell of a Table

[ThomasH]

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I want to modify how table cells are translated. I started out like with 
other AST types, e.g.

function Cell(cell)
   ... (do something with cell)
end

This function is never called, although the input document contains a table 
with cells. 

I assume, element components like cells are treated differently (although 
they seem to appear in the AST like other AST nodes).

What is the correct way to write filter functions for element components?

Thanks, T.

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Re: Lua Filter: How to write a filter function for a Cell of a Table

[ThomasH]

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Ok, I implemented a solution going off of the Table filter. This is the 
basic pattern:

function Table(table)
    for ibody=1, #table.bodies do
        local tbody = table.bodies[ibody]
        for irow=1, #tbody.body do
            local row = tbody.body[irow]
            for icell=1, #row.cells do
                local cell = row.cells[icell]
                for iblock=1, #cell.contents do
                    cell.contents[iblock] = 
cell.contents[iblock]:walk(some_filter_map)  -- cell blocks can be walk'ed 
again
...
end

This works, but is ugly because of all those nested loops.

I wonder is there a specific reason to exempt the element components like 
rows and cells from the normal visitor pattern?

On Monday, May 15, 2023 at 10:18:38 AM UTC+2 ThomasH wrote:

> I want to modify how table cells are translated. I started out like with 
> other AST types, e.g.
>
> function Cell(cell)
>    ... (do something with cell)
> end
>
> This function is never called, although the input document contains a 
> table with cells. 
>
> I assume, element components like cells are treated differently (although 
> they seem to appear in the AST like other AST nodes).
>
> What is the correct way to write filter functions for element components?
>
> Thanks, T.
>

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