# Module:URL

---
-- This module implements
---
-- See unit tests at Module:URL/testcases  
local p = {}  
local function safeUri(s)
local success, uri = pcall(function
return mw.uri.new(s)
end)
if success then
return uri
end
end  
local function extractUrl(args)
for name, val in pairs(args) do
if name ~= 2 and name ~= "msg" then
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
end  
function p._url(url, text, msg)
url = mw.text.trim(url or '')
text = mw.text.trim(text or '')
local nomsg = (msg or ''):sub(1,1):lower == "n" or msg == 'false' -- boolean: true if msg is "false" or starts with n or N  
if url == '' then
if text == '' then
if nomsg then
return nil
else
return mw.getCurrentFrame:expandTemplate{ title = 'tlx', args = { 'URL', "*example.com*", "*optional display text*" } }
end
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')  
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 <wbr> before _/.-# sequences
text = mw.ustring.gsub(text,"(/+)","<wbr/>%1") -- This entry MUST be the first. "<wbr/>" has a "/" in it, you know.
text = mw.ustring.gsub(text,"(%.+)","<wbr/>%1")
-- text = mw.ustring.gsub(text,"(%-+)","<wbr/>%1") -- DISABLED for now
text = mw.ustring.gsub(text,"(%#+)","<wbr/>%1")
text = mw.ustring.gsub(text,"(_+)","<wbr/>%1")
else -- URL is badly-formed, so just display whatever was passed in
text = url
end
end  
return mw.ustring.format('<span>[%s %s]</span>', url, text)
end  
---
The main entry point for calling from Template:URL.
---
function p.url
local templateArgs = .args
local parentArgs = :getParent.args
local url = templateArgs[1] or parentArgs[1]
local text = templateArgs[2] or parentArgs[2] or ''
local msg = templateArgs.msg or parentArgs.msg or ''
url = url or extractUrl(templateArgs) or extractUrl(parentArgs) or ''
return p._url(url, text, msg)
end  
---
The entry point for calling from the forked Template:URL2.
This function returns no message by default.
It strips out wiki-link markup, html tags, and everything after a space.
---
function p.url2
local templateArgs = .args
local parentArgs = :getParent.args
local url = templateArgs[1] or parentArgs[1]
local text = templateArgs[2] or parentArgs[2] or ''
-- default to no message
local msg = templateArgs.msg or parentArgs.msg or 'no'
url = url or extractUrl(templateArgs) or extractUrl(parentArgs) or ''
-- if the url came from a Wikidata call, it might have a pen icon appended
-- we want to keep that and add it back at the end.
local u1, penicon = mw.ustring.match( url, "(.*)(&nbsp;<span'):gsub("<[^>]*>", ""):gsub("[%[%]]", "")
-- truncate anything after a space
url = url:gsub("%%20", " "):gsub(" .*", "")
return (p._url(url, text, msg) or "") .. (penicon or "")
end  
return p