มอดูล: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, '^HhTtTtPp(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 HTTPS URL without the double slash, fix it.
	url = mw.ustring.gsub(url, '^HhTtTtPp(Ss?):(/?)(^/)', 'http%1://%3')
	-- Handle URLs from Wikidata of the format http://
	url = mw.ustring.gsub(url, '^HhTtTtPp(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
--
The main entry point for calling from Template:URL.
--
function p.url(frame)
	local templateArgs = frame.args
	local parentArgs = frame:getParent().args
	local url = templateArgs1 or parentArgs1
	local text = templateArgs2 or parentArgs2 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(frame)
	local templateArgs = frame.args
	local parentArgs = frame:getParent().args
	local url = templateArgs1 or parentArgs1
	local text = templateArgs2 or parentArgs2 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, "(.*)( *>", ""):gsub("%%", "")
	-- truncate anything after a space
	url = url:gsub("%%20", " "):gsub(" .*", "")
	return (p._url(url, text, msg) or "") .. (penicon or "")
end
return p