Module:Template translation

local this = {}

function this.checkLanguage(subpage, default) --Check first if there's an apostrophe, because they break the isKnownLanguageTag       function. This test does not work with regexps, use plain search instead (no need        to use Unicode parser, apostrophes can only appear isolated as one byte in UTF-8). if (string.find(subpage, "'", 1, true) == nil) then -- Return the subpage only if it is a valid language code. if (mw.language.isKnownLanguageTag(subpage)) then return subpage end end -- Otherwise there's currently no known language subpage return default end

--Get the last subpage of the current page if it is a translation. function this.getLanguageSubpage local subpage = mw.title.getCurrentTitle.subpageText return this.checkLanguage(subpage, '') end

--Get the last subpage of the current frame if it is a translation.   Not used locally. function this.getFrameLanguageSubpage(frame) local titleparts = mw.text.split(frame:getParent:getTitle, '/') local subpage = titleparts[#titleparts] return this.checkLanguage(subpage, '') end

--Get the language of the current page.   Not used locally. function this.getLanguage local subpage = mw.title.getCurrentTitle.subpageText return this.checkLanguage(subpage, mw.language.getContentLanguage:getCode) end

--Get the language of the current frame.   Not used locally. function this.getFrameLanguage(frame) local titleparts = mw.text.split(frame:getParent:getTitle, '/') local subpage = titleparts[#titleparts] return this.checkLanguage(subpage, mw.language.getContentLanguage:getCode) end

--If on a translation subpage (like Foobar/de), this function renders   a given template in the same language, if the translation is available.    Otherwise, the template is rendered in its default language, without    modification.    This is aimed at replacing the current implementation of Template:TNT. function this.renderTranslatedTemplate(frame) local args = frame.args local pagename = args['template'] --Check whether the pagename is actually in the Template namespace, or       if we're transcluding a main-namespace page.        (added for backward compatibility of Template:TNT) local title local namespace = args['namespace'] or '' if (namespace ~= '') -- Checks for namespace parameter for custom ns. then title = mw.title.new(pagename, namespace) -- Costly else -- Supposes that set page is in ns10. namespace = 'Template' title = mw.title.new(pagename, namespace) -- Costly if (title.id == 0) then -- not found in the Template namespace, assume the main namespace (for backward compatibility) namespace = '' title = mw.title.new(pagename, namespace) -- Costly end end -- Get the last subpage and check if it matches a known language code. local subpage = this.getLanguageSubpage if (subpage == '') then -- Check if a translation of the pagename exists in English local newtitle = mw.title.new(pagename .. '/' .. 'en', namespace) -- Costly -- Use the translation when it exists if (newtitle.id ~= 0) then title = newtitle end else -- Check if a translation of the pagename exists in that language local newtitle = mw.title.new(pagename .. '/' .. subpage, namespace) -- Costly if (newtitle.id == 0) then -- Check if a translation of the pagename exists in English newtitle = mw.title.new(pagename .. '/' .. 'en', namespace) -- Costly end -- Use the translation when it exists if (newtitle.id ~= 0) then title = newtitle end end -- At this point the title should exist, otherwise render a red link to the missing page (resolved in its assumed namespace) if (title.id == 0) then return  .. title.prefixedText ..  end -- Copy args pseudo-table to a proper table so we can feed it to expandTemplate. -- Then render the pagename. local arguments = {} for k, v in pairs((frame:getParent or {}).args) do       -- numbered args >= 1 need to be shifted local n = tonumber(k) or 0 if (n > 0) then if (n >= 2) then arguments[n - 1] = v           end else arguments[k] = v       end end return frame:expandTemplate{title = ':' .. title.prefixedText, args = arguments} end

return this