Module:Dir

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-- This module implements [[Template:Dir]].

local p = {}

local function trim(s)
	if s then
		return s:match('^%s*(.-)%s*$')
	else
		return nil
	end
end

local function trimAndRemoveBlanks(s)
	if s then
		s = trim(s)
		if s ~= '' then
			return s
		end
	end
	return nil
end

local function isRTL(code)
	local success, ret = pcall(function ()
		return mw.language.new(code):isRTL()
	end)
	return success and ret
end

function p.main(frame)
	local args = frame:getParent().args
	local code = trimAndRemoveBlanks(args[1])
	if isRTL(code) then
		return trim(args[2]) or 'rtl'
	else
		return trim(args[3]) or 'ltr'
	end
end

return p