--[[   __  __           _       _        _                      ____          _ _       _       |  \/  | ___   __| |_   _| | ___ _| |    __ _ _ __   __ _/ ___|_      _(_) |_ ___| |__    | |\/| |/ _ \ / _` | | | | |/ _ (_) |   / _` | '_ \ / _` \___ \ \ /\ / / | __/ __| '_ \   | |  | | (_) | (_| | |_| | |  __/_| |__| (_| | | | | (_| |___) \ V  V /| | || (__| | | |  |_|  |_|\___/ \__,_|\__,_|_|\___(_)_____\__,_|_| |_|\__, |____/ \_/\_/ |_|\__\___|_| |_|                                                      |___/                                 Authors and maintainers:  User:Zolo   - original version in Module:Fallback  User:Jarekt  ]]  local p = {}  --[[ _langSwitch   This function is the core part of the LangSwitch template.    Example usage from Lua: text = _langSwitch({en='text in english', pl='tekst po polsku'}, lang)   Parameters:   args - table with translations by language   lang - desired language (often user's native language)    Error Handling:   ]] local function defaultCheck(args) 	if not args.en and not args.default then 		local err = 'LangSwitch Error: no default' 		if args.nocat == '1' then 			return err 		else 			return err .. 'Category:LangSwitch template without default version' 		end 	end 	return false end  local function quickSwitch(args, arg) 	local err = defaultCheck(args) 	if err then 		return err 	end 	if arg == '~' then 		arg = 	end 	return arg end  function p._langSwitch(args, lang) -- args: table of translations 	-- Return error if there is not default and no english version 	local err = defaultCheck(args) 	if err then 		return err 	end 	-- get the list of accepetable language (lang + those in lang's fallback chain) and check their content 	assert(lang, 'LangSwitch Error: no lang')  	--local langList = {lang} 	--if not args[lang] then 	local langList = mw.language.getFallbacksFor(lang) 	table.insert(langList, 1, lang) 	table.insert(langList, math.max(#langList, 2), 'default') 	--end  	for _, language in ipairs(langList) do 		lang = args[language] 		if lang == '~' then 			return  		elseif lang and lang ~=  then 			return lang 		end 	end end  --[[ langSwitch   This function is the core part of the LangSwitch template.    Example Usage from a template:    Parameters:   frame.args - table with translations by language   frame.args.lang - desired language (often user's native language)    Error Handling:   ]] function p.langSwitch(frame) -- version to be used from wikitext 	local args = frame.args 	-- if no expected args provided than check parent template/module args 	if args.en == nil and args.default == nil and args.nocat == nil then 		args = mw.getCurrentFrame():getParent().args 	end  	local lang = args.lang 	if not lang or not mw.language.isSupportedLanguage(lang) then 		lang = frame:callParserFunction("int", "lang") -- get user's chosen language 	end  	-- Try quick switch 	local args1 = args[lang] 	if args1 and args1 ~=  then 		return quickSwitch(args, args1) 	end  	-- Allow input in format:  	-- with multiple languages mapping to a single value 	args1 = {} 	for name, value in pairs(args) do 		if value ~= '' and type(name) == 'string' then 			-- split multi keys 			for str in string.gmatch(name, "([^/]+)") do 				args1[str] = value 			end 		end 	end 	return p._langSwitch(args1, lang) end  return p