pandoc/test/lua/blocks-filter.lua

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
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 23:26:00 +01:00			`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`