Module:Coxeter–Dynkin diagram/sandbox

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This module implements Template:Coxeter–Dynkin diagram. It is invoked as

• {{#invoke:Coxeter–Dynkin diagram|CDD}}

though the parameter is ignored; instead it uses the parameters passed to the template. See the template documentation for how that is used.

For using this from other Lua modules, first load the module.

local CDD = require('Module:Coxeter–Dynkin diagram')._CDD

You can then use it with the following syntax.

CDD{"node", "3", "node"}

See the template documentation for possible inputs.

The above documentation is transcluded from Module:Coxeter–Dynkin diagram/doc. (edit | history)
Editors can experiment in this module's sandbox (edit | diff) and testcases (edit | run) pages.
Add categories to the /doc subpage. Subpages of this module.

-- 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