-- This module implements {{URL}}
-- See unit tests at [[Module:URL/tests]]
local p = {}
function trim(s)
    return (mw.ustring.gsub(s, "^%s*(.-)%s*$", "%1"))
function safeUri(s)
    local success, uri = pcall(function()
    if success then
        return uri
function p._url(url, text)
    url = trim(url or '')
    text = trim(text or '')
    if url == '' then
        if text == '' then
            return '<strong class="error">URL: Syntax error.</strong> ([[Template:URL/doc|Help!]])'
            return text
    -- If the URL contains any unencoded spaces, encode them, because MediaWiki will otherwise interpret a space as the end of the URL.
    url = mw.ustring.gsub(url, '%s', function(s) return mw.uri.encode(s, 'PATH') end)
    -- If there is an empty query string or fragment id, remove it as it will cause to throw an error
    url = mw.ustring.gsub(url, '#$', '')
    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. or, and //
    if uri and (not uri.protocol or (uri.protocol and not and url:sub(1, 2) ~= '//' then
        url = 'http://' .. url
        uri = safeUri(url)
    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( or '') .. port .. (uri.relativePath or '')
        else -- URL is badly-formed, so just display whatever was passed in
            text = url
	-- 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)
function p.url(frame)
    local templateArgs = frame.args
    local url = templateArgs[1] or ''
    local text = templateArgs[2] or ''
    return p._url(url, text)
return p

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