Modul:If empty

Documentation for this module may be created at Modul:If empty/doc

local p = {}

function p.main(frame)
	local args = require('Module:Arguments').getArgs(frame, {wrappers = 'Template:If empty', removeBlanks = false})

	local lastk = 0
	for k,v in ipairs(args) do
		if v ~= '' then
			return v
		end
		lastk = k
	end

	-- For backwards compatibility reasons, the first 8 parameters can be unset instead of being blank,
	-- even though there's really no legitimate use case for this. At some point, this will be removed.
	for i = lastk + 1, 9 do
		if args[i] and args[i] ~= '' then
			-- If any uses of this template depend on the behavior above, add them to a tracking category.
			-- This is a rather fragile, convoluted, hacky way to do it, but it ensures that this module's output won't be modified
			-- by it.
			frame:extensionTag('ref', '[[Category:Instances of Template:If_empty missing arguments]]', {group = 'TrackingCategory'})
			frame:extensionTag('references', '', {group = 'TrackingCategory'})

			return args[i]
		end
	end

end

return p