url

-- -- This module implements {{URL}}  local p = {}   local function trim(s) return (mw.ustring.gsub(s, "^%s*(.-)%s*$", "%1")) end  local function safeUri(s) local success, uri = pcall(function() return mw.uri.new(s) end) if success then return uri end end  function p._url(url, text) url = trim(url or '') text = trim(text or '')  if url == '' then if text == '' then return mw.getCurrentFrame():expandTemplate{ title = 'tlx', args = { 'URL', "''example.com''", "''optional display text''" } } else return text end end  -- If the URL contains any unencoded spaces, encode them, because MediaWiki will otherwise interpret a space as the end of the URL. url = mw.ustring.gsub(url, '%s', function(s) return mw.uri.encode(s, 'PATH') end)  -- If there is an empty query string or fragment id, remove it as it will cause mw.uri.new to throw an error url = mw.ustring.gsub(url, '#$', '') 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  local 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  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  return p