Template:Fallback

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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'}, 
 ['be-x-old']   = {'be-tarask'}, 
 ['br']         = {'fr'}, 
 ['ckb']        = {'fa'}, 
 ['co']         = {'fr'}, 
 ['crh-cyrl']   = {'crh'}, 
 ['crh-latn']   = {'crh'},
 ['de-ch']      = {'de'}, 
 ['de-formal']  = {'de'},
 ['de-formal']  = {'de'},
 ['en-gb']      = {'en'}, 
 ['frp']        = {'fr'}, 
 ['frr']        = {'de'}, 
 ['fy']         = {'nl'}, 
 ['glk']        = {'fa'}, 
 ['hif-deva']   = {'hif'}, 
 ['hif-latn']   = {'hif'}, 
 ['ht']         = {'fr'}, 
 ['ike-cans']   = {'ik'}, 
 ['kk-arab']    = {'kk'}, 
 ['kk-cn']      = {'kk'}, 
 ['kk-cyrl']    = {'kk'}, 
 ['kk-kz']      = {'kk'}, 
 ['kk-latn']    = {'kk'}, 
 ['kk-tr']      = {'kk'}, 
 ['ksh']        = {'de'}, 
 ['ku-arab']    = {'ku'}, 
 ['ku-latn']    = {'ku'}, 
 ['li']         = {'nl'}, 
 ['mg']         = {'fr'}, 
 ['mzn']        = {'fa'}, 
 ['nds']        = {'nds-nl', 'de'}, 
 ['nds-nl']     = {'nds', 'nl'}, 
 ['nl-informal']= {'nl'}, 
 ['pdt']        = {'nds', 'de'}, 
 ['pt-br']      = {'pt'}, 
 ['ruq-grek']   = {'ruq'}, 
 ['rug-latn']   = {'ruq'}, 
 ['ruq-cyrl']   = {'ruq'}, 
 ['sr-ec']      = {'sr'}, 
 ['sr-el']      = {'sr'}, 
 ['szl']        = {'pl'}, 
 ['tg-cyrl']    = {'tg'}, 
 ['tg-latn']    = {'tg'}, 
 ['tt-cyrl']    = {'tt'}, 
 ['tt-latn']    = {'tt'}, 
 ['ty']         = {'fr'}, 
 ['vec']        = {'it'}, 
 ['vls']        = {'nl'}, 
 ['wa']         = {'fr'}, 
 ['zea']        = {'nl'}, 
 ['zh']         = {'zh-hans'}, 
 ['zh-cn']      = {'zh-hans'}, 
 ['zh-hans']    = {'zh-cn', 'zh'}, 
 ['zh-hant']    = {'zh'}, 
 ['zh-hk']      = {'zh-hant'}, 
 ['zh-mo']      = {'zh-hant'}, 
 ['zh-my']      = {'zh-hans'}, 
 ['zh-sg']      = {'zh-hans'}, 
 ['zh-tw']      = {'zh-hant'}
}

function p.getfallback(args, lang)
	if not lang then lang = args.lang end
	
	if args[lang] and args[lang] ~= '' then
		return 	args[lang]
	end
	if langlist[lang] then -- if there is a fallbacklist, check if there is a message for its languages 
		text = p.fallbackloop(args, langlist[lang], '')
	end
	if text then
		return text
	end
	if args.default then
		return args.default
	end
	if args.en then 
		return args.en
	end
end

function p.fallbackloop(args, totest, tested) 
	-- iterates through the langlist fallback table
	-- totest = tables of languages whose fallbacks need to be examined
	-- tested = string with language that have been examined
	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, lang, 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
	-- gets the most appropriate language 
	text = p.getfallback(args)
	if text == '~' then return '' end -- ~ indicates that no message should be shown in this language
	return text 
end

return p