pandoc/test/lua/blocks-filter.lua at 90af1384433b1f537fa51f1018539d4d401ec73b - pandoc - Gitea: Git with a cup of tea

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Albert Krewinkel 672a4bdd1d Lua filters: allow filtering of element lists (#6040 )

Lists of Inline and Block elements can now be filtered via `Inlines` and
`Blocks` functions, respectively. This is helpful if a filter conversion
depends on the order of elements rather than a single element.

For example, the following filter can be used to remove all spaces
before a citation:

    function isSpaceBeforeCite (spc, cite)
      return spc and spc.t == 'Space'
       and cite and cite.t == 'Cite'
    end

    function Inlines (inlines)
      for i = #inlines-1,1,-1 do
        if isSpaceBeforeCite(inlines[i], inlines[i+1]) then
          inlines:remove(i)
        end
      end
      return inlines
    end

Closes: #6038

2020-01-15 14:26:00 -08:00

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 function Blocks (blks)
   -- verify that this looks like a `pandoc.List`
   if not blks.find or not blks.map or not blks.filter then
     error("table doesn't seem to be an instance of pandoc.List")
   end
   -- return plain block containing the number of elements in the list
   return {pandoc.Plain {pandoc.Str(tostring(#blks))}}
 end