Zobrazení zdroje stránky Modul: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
			-- xxx: proč tohle nevyužívá standardní rekurzi?
			return mw.getCurrentFrame():expandTemplate{ title = 'tlx', args = { 'URL', "''example.cz''", "''volitelný text k zobrazení''" } }
		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&#58;//
	url = mw.ustring.gsub(url, '^[Hh][Tt][Tt][Pp]([Ss]?)&#58;//', '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 '')
		else -- URL is badly-formed, so just display whatever was passed in
			text = url
		end
	end

	-- 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")

	return mw.ustring.format('<span class="url">[%s %s]</span>', url, text)
end

function p.url(frame)
	local templateArgs = frame.args
	local url = templateArgs[1] or ''
	local text = templateArgs[2] or ''
	return p._url(url, text)
end

return p