Модул:URL

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--
-- This module implements {{URL}}
--
-- See unit tests at [[Module:URL/testcases]]

local p = {}
 
function trim(s)
    return (mw.ustring.gsub(s, "^%s*(.-)%s*$", "%1"))
end

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''", "''опциони текст за приказ''" } }
        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 = mw.ustring.gsub(url, '[Hh][Tt][Tt][Pp]([Ss]?)://', '')  -- this is to remove double protocol (e.g. "http://http://" in article [[Кезон Сити]])
        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

	text = mw.ustring.gsub(text,"https?://","")  -- this is to chop off any displayed "http://" or "https://"
	text = mw.ustring.gsub(text,"/(%;sr%-e[cl])","%1")  -- remove displayed trailing "/" for sr and sr-ec
	text = mw.ustring.gsub(text,"/(%;%}%-)","%1")  -- remove displayed trailing "/" for sr-el

--	text = mw.ustring.gsub(text,"%-%{","-")  -- only a test function; remove comment -- and BREAK WHOLE OUTPUT! in order to see inside of it while previewing a page that uses [[template:official URL]]; example of broken output: displayed text is "-sr:www.quezoncity.gov.ph;sr-ec:www.quezoncity.gov.ph;sr-el:www.quezoncity.gov.ph;}-" and link address is "http://www.quezoncity.gov.ph/"

	-- 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")
	
    function p.url(frame)
        local ifArgs = frame.args
        local iftext = templateArgs[2] or ''
        return p._url(iftext)
    end
    if text == 'Званични веб-сајт' or text == 'Zvanični veb-sajt' or (iftext ~= nil and iftext ~= '') then
	return mw.ustring.format('<span class="url">[%s %s]</span>', url, text)
    else
	return mw.ustring.format('<span class="url">[%s -{%s}-]</span>', url, text)
    end
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