Module:Fallback

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This documentation is transcluded from Module:Fallback/doc.

This module is rated as ready for general use. It has reached a mature form and is thought to be bug-free and ready for use wherever appropriate. To reduce server load and bad output, it should be improved by sandbox testing rather than repeated trial-and-error editing.

This module is subject to page protection. It is a highly visible module in use by a very large number of pages, or is substituted very frequently. Because vandalism or mistakes would affect many pages, and even trivial editing might cause substantial load on the servers, it is protected from editing.

Dependencies

• Module:Fallbacklist catalogs old fallback chains for each language as it was set up on Commons a decade ago. Lua allows now to access the default MediaWiki fallback chains which are used by most templates.

local p = {}
local langlist = {
 af = {'nl'}, 
 als = {'de'}, 
 arz = {'ar'}, 
 bar = {'de'}, 
 bexold = {'betarask'}, 
 br = {'fr'}, 
 ckb = {'fa'}, 
 co = {'fr'}, 
 crhcyrl = {'crh'}, 
 crhlatn = {'crh'}, 
 csb = {'pl'}, 
 deat = {'de'}, 
 dech = {'de'}, 
 deformal = {'de'}, 
 engb = {'en'}, 
 frp = {'fr'}, 
 frr = {'de'}, 
 fy = {'nl'}, 
 glk = {'fa'}, 
 hifdeva = {'hif'}, 
 hilatn = {'hif'}, 
 ht = {'fr'}, 
 ikecans = {'ik'}, 
 kkarab = {'kk'}, 
 kkcn = {'kk'}, 
 kkcyrl = {'kk'}, 
 kkkz = {'kk'}, 
 kklatn = {'kk'}, 
 kktr = {'kk'}, 
 ksh = {'de'}, 
 kuarab = {'ku'}, 
 kulatn = {'ku'}, 
 li = {'nl'}, 
 mg = {'fr'}, 
 mzn = {'fa'}, 
 nds = {'ndsnl', 'de'}, 
 ndsnl = {'nds', 'nl'}, 
 nlinformal = {'nl'}, 
 pdt = {'nds', 'de'}, 
 ptbr = {'pt'}, 
 ruggrek = {'ruq'}, 
 rulatn = {'ruq'}, 
 ruqcyrl = {'ruq'}, 
 srec = {'sr'}, 
 srel = {'sr'}, 
 szl = {'pl'}, 
 tgcyrl = {'tg'}, 
 tglatn = {'tg'}, 
 ttcyrl = {'tt'}, 
 ttlatn = {'tt'}, 
 ty = {'fr'}, 
 vec = {'it'}, 
 vls = {'nl'}, 
 wa = {'fr'}, 
 zea = {'nl'}, 
 zh = {'zhhans'}, 
 zhcn = {'zhhans'}, 
 zhhans = {'zhcn', 'zh'}, 
 zhhant = {'zh'}, 
 zhhk = {'zhhant'}, 
 zhmo = {'zhhant'}, 
 zhmy = {'zhhans'}, 
 zhsg = {'zhhans'}, 
 zhtw = {'zhhant'}
}

function p.processarg(arg)
	if arg == '~' then
		return ''
	elseif arg then
		return arg
	else
		return nil
	end
end

function p.getfallback(args, lang, totest, tested)
	if not tested then tested = {} end
	for i, j in pairs(totest) do
		for k, l in pairs(langlist[j]) do
			if args[l] then
				return args[l]
			else if not tested[l] then
				table.insert(totest, l)
			end
		end
	table.insert(tested, j)
	table.remove(totest, j)
	end
	if totest == {} then 
		return nil
	end
	return p.getfallback(args, lang, totest, tested)
end

function p.langSwitch(frame)
	local args = frame.args
	for i, j in pairs(args) do
		i = mw.ustring.gsub( i, "-", "")
	end
	if args.lang then
		lang = args.lang
	else 
		lang = frame:preprocess('{{int:lang}}')
	end
	if args[lang] then
		return processarg(args[lang])
	end
	if langlist[lang] then
		fb = p.getfallback(args, lang, langlist[lang])
		if fb then
			return p.processarg[bf]
		end
	end
	end	
	if args.default then
		return p.processarg(args.default)
	end
	if args.en then 
		return processarg(args.en)
	end
	return '[[Category:LangSwitch template without default version]]'
end 
return p