Url

-- -- This module implements {{URL}} -- -- See unit tests at [[Module:URL/tests]]  local p = {}   local function safeUri(s)     local success, uri = pcall(function()         return mw.uri.new(s)     end)     if success then         return uri     end end  function p._url(url, text)     url = mw.text.trim(url or '')     text = mw.text.trim(text or '')          if url == '' then         if text == '' then             return mw.getCurrentFrame():expandTemplate{ title = 'tlx', args = { 'URL', "''example.com''", "''optional display text''" } }         else             return text         end     end          -- If the URL contains any unencoded spaces, encode them, because MediaWiki will otherwise interpret a space as the end of the URL.     url = mw.ustring.gsub(url, '%s', function(s) return mw.uri.encode(s, 'PATH') end)          -- If there is an empty query string or fragment id, remove it as it will cause mw.uri.new to throw an error     url = mw.ustring.gsub(url, '#$', '')     url = mw.ustring.gsub(url, '%?$', '')          -- If it's an HTTP[S] URL without the double slash, fix it.     url = mw.ustring.gsub(url, '^[Hh][Tt][Tt][Pp]([Ss]?):(/?)([^/])', 'http%1://%3')      -- Handle URLs from Wikidata of the format http://     url = mw.ustring.gsub(url, '^[Hh][Tt][Tt][Pp]([Ss]?)://', 'http%1://')          local uri = safeUri(url)          -- Handle URL's without a protocol and URL's that are protocol-relative,      -- e.g. www.example.com/foo or www.example.com:8080/foo, and //www.example.com/foo     if uri and (not uri.protocol or (uri.protocol and not uri.host)) and url:sub(1, 2) ~= '//' then         url = 'http://' .. url         uri = safeUri(url)     end          if text == '' then         if uri then             if uri.path == '/' then uri.path = '' end                          local port = ''             if uri.port then port = ':' .. uri.port end                          text = mw.ustring.lower(uri.host or '') .. port .. (uri.relativePath or '')  -- Add  before _/.-# sequences text = mw.ustring.gsub(text,"(/+)","%1")      -- This entry MUST be the first. "" has a "/" in it, you know. text = mw.ustring.gsub(text,"(%.+)","%1") -- text = mw.ustring.gsub(text,"(%-+)","%1") -- DISABLED for now text = mw.ustring.gsub(text,"(%#+)","%1") text = mw.ustring.gsub(text,"(_+)","%1")         else -- URL is badly-formed, so just display whatever was passed in             text = url         end     end      return mw.ustring.format('[%s %s]', url, text) end  function p.url(frame)     local templateArgs = frame.args local parentArgs = frame:getParent().args;     local url = templateArgs[1] or parentArgs[1] or ''     local text = templateArgs[2] or parentArgs[2]     if not text then     url = url or extractUrl(templateArgs) or extractUrl(parentArgs); end text = text or ''     return p._url(url, text) end function extractUrl(args) for name, val in pairs(args) do local url = name .. "=" .. val; url = mw.ustring.gsub(url, '^[Hh][Tt][Tt][Pp]([Ss]?):(/?)([^/])', 'http%1://%3') local uri = safeUri(url); if uri and uri.host then return url end end end return p