Template:Fallback

Template documentation

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This template was imported from commons:Template:Fallback without the here unusable documentation.

---

Use localised subpage for the user language with fallback to {{CONTENTLANGUAGE}}

Template parameters[Edit template data]

Parameter		Description	Type	Status
page	1	Template name	Page name	required
lang	2	override user language on localised page Default {{int:Lang}}	String	optional

The above documentation is transcluded from Template:Fallback/doc. (edit | history)
Editors can experiment in this template’s sandbox (create | mirror) and testcases (create) pages.
Please add categories to the /doc subpage. Subpages of this template.

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, totest, tested)
	if not tested then tested = '' end  -- tested values in a string, more convenient
	for i, j in pairs(totest) do
		if args[j] and args[j] ~= '' then
				return args[j]
		end
		if langlist[j] then 
			for k, l in pairs(langlist[j]) do
				table.insert(totest, l)
			end
		end
		tested = tested .. ' ' .. j
	end
	for i, j in pairs(totest) do
		if not string.find(tested, ' ' .. j) then 
			p.getfallback(args, totest, tested)
		end
	end
	return nil
end

function p.langSwitch(frame)
	args = mw.getCurrentFrame():getParent().args
	-- Return error if there is not default and no english version
	if not args.en and not args.default and args.nocat ~= '1' then
		return frame:expandTemplate{ title = "red", args = {'LangSwitch error: no default'}} .. '[[Category:LangSwitch template without default version]]' 
	end
	-- get language (either stated one or user's default language)
	if args.lang then 
		lang = args.lang
	else 
		lang = frame:preprocess( "{{int:lang}}" )
	end
	--
	for i in pairs(args) do
		args[mw.ustring.gsub( i, "-", "")] = args[i]
	end
	-- if one of the arguments matches the desired language than return it
	if args[lang] and args[lang] ~= '' then
		return p.processarg(args[lang])
	end
	-- If language is in the fallback list
	if langlist[lang] then
		fb = p.getfallback(args, langlist[lang])
		if fb and fb ~= '' then
			return p.processarg(fb)
		end
	end	
	if args.default and args.default ~= '' then
		return p.processarg(args.default)
	end
	if args.en and args.en ~= '' then 
		return p.processarg(args.en)
	end
end
return p