Module:Ordinal

 --[[ 

 This template will add the appropriate ordinal suffix to a given integer.

 Please do not modify this code without applying the changes first at
 Module:Ordinal/sandbox and testing.

 ]]

 local p = {}

 local yesno = require('Module:Yesno') -- boolean value interpretation

 --[[
 This function converts an integer value into a numeral followed by ordinal indicator.
 The output string might contain HTML tags.

 Usage:
 {{#invoke:Ordinal|ordinal|1=|2=|sup=}}
 {{#invoke:Ordinal|ordinal}} - uses the caller's parameters

 Parameters
  1: Any number or string.
  2: Set to "d" if the module should display "d" instead of "nd" and "rd".
  sup: Set to yes/no to toggle superscript ordinal suffix.
 ]]
 function p.ordinal(frame)
	local args = frame.args
 if args[1] == nil then
 args = frame:getParent().args
 end
 if args[1] == nil then
 	args[1] = "{{{1}}}"
 end
 return p._ordinal(args[1], (args[2] == 'd'), yesno(args.sup))
 end

 function p._ordinal(n, d, sup)
	local x = tonumber(mw.ustring.match(n, "(%d*)%W*$"))
	local suffix = "th"
	-- If tonumber(n) worked:
	if x then
		local mod10 = math.abs(x) % 10
		local mod100 = math.abs(x) % 100
		if mod10 == 1 and mod100 ~= 11 then
			suffix = "st"
		elseif mod10 == 2 and mod100 ~= 12 then
			if d then suffix = "d" else suffix = "nd" end
		elseif mod10 == 3 and mod100 ~= 13 then
			if d then suffix = "d" else suffix = "rd" end
		end
	end
	if sup then
		suffix = "<sup>" .. suffix .. "</sup>"
	end
	return n .. suffix
 end

 return p