-- module to turn a parameter list into a list of [[Coxeter–Dynkin diagram]] images.

-- See the template documentation or any example for how it is used and works.

local p = {}



-- list of file names (minus 'CDel ' and extension) which are available as an

-- SVG version which must be perfectly compatible in appearance and public domain.

-- Uses spaces not underscores.

local has_svg = {'nodes', 'node h', '2', '3', '4', '5', '6', '7', '8', '9',

	'10', '11',

	'label2'}



function show_image(x, double)

	local suffix = "|link=]]"

	if double then

		suffix = "|x46px|link=]]"

	end

	for i, svgfile in ipairs(has_svg) do

		if svgfile == string.gsub(x, '_', ' ') then

			return "[[File:CDel_" .. x .. ".svg" .. suffix

		end

	end

	return "[[File:CDel_" .. x .. ".png" .. suffix

end



function p.CDD(frame)

	-- For calling from #invoke.

	local pframe = frame:getParent()

	local args = pframe.args

	return p._CDD(args)

end

	

function p._CDD(args)

	-- For calling from other Lua modules.

	local body ='<span style="display:inline-block;">'         -- create and start the output string

	local double = false                                       -- experimental only, scale to 2x and see what happens

	for v, x in ipairs(args) do                                -- process params, ignoring any names

		if (x == 'DOUBLE') then

			double = true

		elseif (x ~= '') then						-- check for null/empty names

        	body = body .. show_image(x, double)    -- write file for this parameter

		end

	end

	body = body .. "</span>"                                   -- finish output string

	return body                                                -- return result

end



return p