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	<id>https://embargo.energy/index.php?action=history&amp;feed=atom&amp;title=Module%3AFallback</id>
	<title>Module:Fallback - Revision history</title>
	<link rel="self" type="application/atom+xml" href="https://embargo.energy/index.php?action=history&amp;feed=atom&amp;title=Module%3AFallback"/>
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	<updated>2026-05-18T10:58:52Z</updated>
	<subtitle>Revision history for this page on the wiki</subtitle>
	<generator>MediaWiki 1.35.6</generator>
	<entry>
		<id>https://embargo.energy/index.php?title=Module:Fallback&amp;diff=734&amp;oldid=prev</id>
		<title>imported&gt;MusikBot II: Changed protection settings for &quot;Module:Fallback&quot;: High-risk template or module (more info) ([Edit=Allow only administrators] (indefinite) [Move=Allow only administrators] (indefinite))</title>
		<link rel="alternate" type="text/html" href="https://embargo.energy/index.php?title=Module:Fallback&amp;diff=734&amp;oldid=prev"/>
		<updated>2021-08-23T18:01:07Z</updated>

		<summary type="html">&lt;p&gt;Changed protection settings for &amp;quot;&lt;a href=&quot;/index.php/Module:Fallback&quot; title=&quot;Module:Fallback&quot;&gt;Module:Fallback&lt;/a&gt;&amp;quot;: High-risk template or module (&lt;a href=&quot;/index.php?title=User:MusikBot_II/TemplateProtector&amp;amp;action=edit&amp;amp;redlink=1&quot; class=&quot;new&quot; title=&quot;User:MusikBot II/TemplateProtector (page does not exist)&quot;&gt;more info&lt;/a&gt;) ([Edit=Allow only administrators] (indefinite) [Move=Allow only administrators] (indefinite))&lt;/p&gt;
&lt;p&gt;&lt;b&gt;New page&lt;/b&gt;&lt;/p&gt;&lt;div&gt;local p = {}&lt;br /&gt;
&lt;br /&gt;
-- List the full fallback chain from a language to default (usually English)&lt;br /&gt;
function p.fblist(lang)&lt;br /&gt;
	local fbtable = mw.language.getFallbacksFor(lang)&lt;br /&gt;
	table.insert(fbtable, 1, lang)&lt;br /&gt;
	--[[&lt;br /&gt;
	Take a translation from &amp;quot;Mediawiki:&amp;lt;Message-ID&amp;gt;/&amp;lt;language-code&amp;gt;&amp;quot; namespace&lt;br /&gt;
	or from a loaded i18 resource bundle in MediaWiki for its UI messages (also&lt;br /&gt;
	used by the &amp;quot;{{Int:&amp;lt;Message-ID&amp;gt;}}&amp;quot; parser function), before using the&lt;br /&gt;
	provided default value. Requires args.message = &amp;#039;Message-ID&amp;#039;, instead of&lt;br /&gt;
	args.message = &amp;#039;actual translated message&amp;#039;.&lt;br /&gt;
	--]]&lt;br /&gt;
	table.insert(fbtable, &amp;#039;message&amp;#039;)&lt;br /&gt;
	table.insert(fbtable, &amp;#039;default&amp;#039;)&lt;br /&gt;
	return fbtable&lt;br /&gt;
end&lt;br /&gt;
&lt;br /&gt;
--[==[&lt;br /&gt;
Return an error if there is not default and no English version, otherwise&lt;br /&gt;
return the message in the most appropriate, plus the lang code as a second value.&lt;br /&gt;
--]==]&lt;br /&gt;
function p._langSwitch(args, lang)&lt;br /&gt;
	-- args: table of translations&lt;br /&gt;
	if not args.en and not args.default and not args.message and args.nocat ~= &amp;#039;1&amp;#039; then&lt;br /&gt;
		return error(&amp;quot;langSwitch error: no default&amp;quot;)&lt;br /&gt;
	end&lt;br /&gt;
	-- Get language (either stated one or user&amp;#039;s default language).&lt;br /&gt;
	if not lang then&lt;br /&gt;
		return &amp;#039;&amp;lt;strong class=&amp;quot;error&amp;quot;&amp;gt;LangSwitch Error: no lang&amp;lt;/strong&amp;gt;&amp;#039; -- must become proper error&lt;br /&gt;
	end&lt;br /&gt;
	-- Get the list of acceptable language (lang + those in lang&amp;#039;s fallback chain) and check their content.&lt;br /&gt;
	for _, code in ipairs(p.fblist(lang)) do&lt;br /&gt;
		local msg = args[code]&lt;br /&gt;
		if msg then&lt;br /&gt;
			-- Trim the assigned message value before testing it.&lt;br /&gt;
			msg = mw.text.trim(msg)&lt;br /&gt;
			if msg ~= &amp;#039;&amp;#039; then&lt;br /&gt;
				if code == &amp;#039;message&amp;#039; then&lt;br /&gt;
					-- If this is an UI message. See [[mw:Manual:Messages API]].&lt;br /&gt;
					msg = mw.message.new(args.message):inLanguage(lang)&lt;br /&gt;
					--[==[ If this message name does not exist, converting it to&lt;br /&gt;
					a string would not return an actual message, but this name&lt;br /&gt;
					within curved angle brackets U+29FC/U+29FD &amp;#039;⧼/⧽&amp;#039;, &lt;br /&gt;
					part of mathematical symbols). The UI message may also be&lt;br /&gt;
					disabled administratively if it causes problems.&lt;br /&gt;
					--]==]&lt;br /&gt;
					if msg:exists() and not msg:isDisabled() then&lt;br /&gt;
						--[==[FIXME: In which language is this message?&lt;br /&gt;
						This may be in some fallback language and not lang.&lt;br /&gt;
						Note that some UI messages may have placeholders like &amp;#039;%s&amp;#039;&lt;br /&gt;
						but there&amp;#039;s no way to replace them here by actual values.&lt;br /&gt;
						--]==]&lt;br /&gt;
						return tostring(msg), lang&lt;br /&gt;
					end&lt;br /&gt;
				elseif msg == &amp;#039;~&amp;#039; then&lt;br /&gt;
					return nil, code&lt;br /&gt;
				else&lt;br /&gt;
					return msg, code&lt;br /&gt;
				end&lt;br /&gt;
			end&lt;br /&gt;
		end&lt;br /&gt;
	end&lt;br /&gt;
	return nil&lt;br /&gt;
end&lt;br /&gt;
&lt;br /&gt;
--[==[&lt;br /&gt;
Version to be used from wikitext.&lt;br /&gt;
--]==]&lt;br /&gt;
function p.langSwitch(frame)&lt;br /&gt;
	local args = frame.args&lt;br /&gt;
	-- If no expected args provided than check parent template/module args.&lt;br /&gt;
	if not args.en and not args.default and not args.nocat then&lt;br /&gt;
		args = frame:getParent().args&lt;br /&gt;
	end&lt;br /&gt;
	local lang&lt;br /&gt;
	if args.lang and args.lang ~= &amp;#039;&amp;#039; then&lt;br /&gt;
		lang = args.lang&lt;br /&gt;
		args.lang = nil&lt;br /&gt;
	else -- Get user&amp;#039;s chosen language.&lt;br /&gt;
		lang = frame:preprocess(&amp;quot;{{Int:Lang}}&amp;quot;)&lt;br /&gt;
	end&lt;br /&gt;
--[==[&lt;br /&gt;
	if args.zh ~= &amp;#039;&amp;#039; and args[&amp;#039;zh-hans&amp;#039;] == &amp;#039;&amp;#039; and args[&amp;#039;zh-hant&amp;#039;] == &amp;#039;&amp;#039; then&lt;br /&gt;
	else&lt;br /&gt;
	end&lt;br /&gt;
--]==]&lt;br /&gt;
	local str, language = p._langSwitch(args, lang)&lt;br /&gt;
	return str -- Get the first value of the langSwitch, (the text) not the second (the language).&lt;br /&gt;
end&lt;br /&gt;
&lt;br /&gt;
function p.fallbackpage(base, lang, formatting)&lt;br /&gt;
	local languages = p.fblist(lang)&lt;br /&gt;
	for i, lng in ipairs(languages) do&lt;br /&gt;
		if mw.title.new(base .. &amp;#039;/&amp;#039; .. lng).exists then&lt;br /&gt;
			if formatting == &amp;#039;table&amp;#039; then&lt;br /&gt;
				return {base .. &amp;#039;/&amp;#039; .. lng, lng} -- Returns name of the page + name of the language.&lt;br /&gt;
			else&lt;br /&gt;
				return base .. &amp;#039;/&amp;#039; .. lng -- Returns only the page.&lt;br /&gt;
			end&lt;br /&gt;
		end&lt;br /&gt;
	end&lt;br /&gt;
	return base&lt;br /&gt;
end&lt;br /&gt;
&lt;br /&gt;
--[==[&lt;br /&gt;
Logic for [[Template:Autotranslate]].&lt;br /&gt;
]==]&lt;br /&gt;
function p.autotranslate(frame)&lt;br /&gt;
	local args = frame.args&lt;br /&gt;
	if not args.lang or args.lang == &amp;#039;&amp;#039; then&lt;br /&gt;
		args.lang = frame:preprocess(&amp;quot;{{Int:Lang}}&amp;quot;) -- Get user&amp;#039;s chosen language.&lt;br /&gt;
	end&lt;br /&gt;
	-- Find base page.&lt;br /&gt;
	local base = args.base&lt;br /&gt;
	if not base or base == &amp;#039;&amp;#039; then&lt;br /&gt;
		return &amp;#039;&amp;lt;strong class=&amp;quot;error&amp;quot;&amp;gt;Base page not provided for autotranslate&amp;lt;/strong&amp;gt;&amp;#039;&lt;br /&gt;
	end&lt;br /&gt;
	if string.sub(base, 2, 9) ~= &amp;#039;emplate:&amp;#039; then&lt;br /&gt;
		base = &amp;#039;Template:&amp;#039; .. base -- Base provided without &amp;#039;Template:&amp;#039; part.&lt;br /&gt;
	end&lt;br /&gt;
	-- Find base template language subpage.&lt;br /&gt;
	local page = p.fallbackpage(base, args.lang) --&lt;br /&gt;
	if (not page and base ~= args.base) then&lt;br /&gt;
		-- Try the original args.base string. This case is only needed if base is not in template namespace.&lt;br /&gt;
		page = p.fallbackpage(args.base, args.lang)&lt;br /&gt;
	end&lt;br /&gt;
	if not page then&lt;br /&gt;
		return string.format(&amp;#039;&amp;lt;strong class=&amp;quot;error&amp;quot;&amp;gt;no fallback page found for autotranslate (base=[[%s]], lang=%s)&amp;lt;/strong&amp;gt;&amp;#039;, args.base, args.lang)&lt;br /&gt;
	end&lt;br /&gt;
	-- Repack args in a standard table.&lt;br /&gt;
	local newargs = {}&lt;br /&gt;
	for field, value in pairs(args) do&lt;br /&gt;
		if field ~= &amp;#039;base&amp;#039; then&lt;br /&gt;
			newargs[field] = value&lt;br /&gt;
		end&lt;br /&gt;
	end&lt;br /&gt;
	-- Transclude {{page |....}} with template arguments the same as the ones passed to {{autotranslate}} template.&lt;br /&gt;
	return frame:expandTemplate{ title = page, args = newargs }&lt;br /&gt;
end&lt;br /&gt;
&lt;br /&gt;
--[==[&lt;br /&gt;
Translate data stored in a module.&lt;br /&gt;
]==]&lt;br /&gt;
function p.translate(page, key, lang)&lt;br /&gt;
	if type(page) == &amp;#039;string&amp;#039; then -- If the requested translation table is not yet loaded.&lt;br /&gt;
		page = require(&amp;#039;Module:&amp;#039; .. page)&lt;br /&gt;
	end&lt;br /&gt;
	local val&lt;br /&gt;
	if page[key] then&lt;br /&gt;
		val = page[key]&lt;br /&gt;
	elseif page.keys and page.keys[key] then -- Key &amp;#039;keys&amp;quot; is an index of all keys, including redirects, see [[Module:i18n/datatype]].&lt;br /&gt;
		val = page.keys[key]&lt;br /&gt;
	end&lt;br /&gt;
	if not val then&lt;br /&gt;
		return &amp;#039;&amp;lt;&amp;#039; .. key .. &amp;#039;&amp;gt;&amp;#039;&lt;br /&gt;
	end&lt;br /&gt;
	return p._langSwitch(val, lang)&lt;br /&gt;
end&lt;br /&gt;
&lt;br /&gt;
function p.translatelua(frame)&lt;br /&gt;
	local lang = frame.args.lang&lt;br /&gt;
	local page = require(&amp;#039;Module:&amp;#039; .. mw.text.trim(frame.args[1])) -- Page should only contain a simple of translations.&lt;br /&gt;
	if not lang or mw.text.trim(lang) == &amp;#039;&amp;#039; then&lt;br /&gt;
		lang = frame:preprocess(&amp;quot;{{Int:Lang}}&amp;quot;)&lt;br /&gt;
	end&lt;br /&gt;
	if frame.args[2] then&lt;br /&gt;
		page = page[mw.text.trim(frame.args[2])]&lt;br /&gt;
	end&lt;br /&gt;
	return p._langSwitch(page, lang)&lt;br /&gt;
end&lt;br /&gt;
&lt;br /&gt;
 -- This test does not work (&amp;#039;Module:Fallback/tests/fallbacks&amp;#039; is missing)&lt;br /&gt;
function p.runTests()&lt;br /&gt;
	local toFallbackTest = require(&amp;#039;Module:Fallback/tests/fallbacks&amp;#039;)&lt;br /&gt;
	local result = true&lt;br /&gt;
	mw.log(&amp;#039;Testing fallback chains&amp;#039;)&lt;br /&gt;
	for i, t in ipairs(toFallbackTest) do&lt;br /&gt;
		local fbtbl = table.concat(p.fblist(t.initial), &amp;#039;, &amp;#039;)&lt;br /&gt;
		local expected = table.concat(t.expected, &amp;#039;, &amp;#039;)&lt;br /&gt;
		local ret = (fbtbl == expected)&lt;br /&gt;
		mw.log(i, ret and &amp;#039;passed&amp;#039; or &amp;#039;FAILED&amp;#039;, t.initial, (not ret) and (&amp;#039;FAILED\nis &amp;gt;&amp;gt;&amp;#039; .. fbtbl .. &amp;#039;&amp;lt;&amp;lt;\nbut should be &amp;gt;&amp;gt;&amp;#039; .. expected .. &amp;#039;&amp;lt;&amp;lt;\n&amp;#039;) or &amp;#039;&amp;#039;)&lt;br /&gt;
		result = result and ret&lt;br /&gt;
	end&lt;br /&gt;
	return result&lt;br /&gt;
end&lt;br /&gt;
&lt;br /&gt;
--[==[&lt;br /&gt;
List all input arguments of the template that calls &amp;quot;{{#invoke:Fallback|showTemplateArguments}}&amp;quot;&lt;br /&gt;
]==]&lt;br /&gt;
function p.showTemplateArguments(frame)&lt;br /&gt;
	local str = &amp;#039;&amp;#039;&lt;br /&gt;
	for name, value in pairs( frame:getParent().args ) do&lt;br /&gt;
		if str == &amp;#039;&amp;#039; then&lt;br /&gt;
			str = string.format(&amp;#039;%s=%s&amp;#039;, name, value)          -- argument #1&lt;br /&gt;
		else&lt;br /&gt;
			str = string.format(&amp;#039;%s, %s=%s&amp;#039;, str, name, value) -- the rest&lt;br /&gt;
		end&lt;br /&gt;
	end&lt;br /&gt;
	return str&lt;br /&gt;
end&lt;br /&gt;
&lt;br /&gt;
return p&lt;/div&gt;</summary>
		<author><name>imported&gt;MusikBot II</name></author>
	</entry>
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