وحدة:UrlToWiki

-- This module takes a URL from a Wikimedia project and returns the equivalent wikitext. -- Any actions such as edit, history, etc., are stripped, and percent-encoded characters -- are converted to normal text.

p = {}

local interwiki_table = mw.loadData("Module:InterwikiTable")

local function getHostId(host)

   if type(host) ~= "string" then
       error("Non-string value for host name detected.")
   end
   -- Find the entry for the host in the interwiki table.
   local id
   for k,v in pairs(interwiki_table) do
       if mw.ustring.match(host, interwiki_table[k].domain) then
           id = k
           break
       end
   end
   return id

end

local function getInterwiki(host)

   -- This function returns the value of the interwiki prefix.
   if type(host) ~= "string" then
       error("Non-string value for host name detected.")
   end
   host = mw.language.getContentLanguage():lc(host)
   local host_id = getHostId(host)
   if not host_id then return end -- If the host isn't valid then the language and the interwiki are also invalid.

   -- Find the language in the interwiki prefix, if applicable.
   local lang = mw.ustring.match(host, "^(.-)%.") -- Find the text before the first period.
   if not lang or not mw.language.isSupportedLanguage(lang) then -- Check if lang is a valid language code.
       lang = false
   end
   -- A language prefix is not necessary if there is already a language prefix for the host in the interwiki table.
   local domain_lang = mw.ustring.match(interwiki_table[host_id].domain, "^(.-)%.") -- Find the text before the first period.
   if  mw.language.isSupportedLanguage(domain_lang) then
       lang = false
   end
   
   -- No need for an interwiki link if we are on the same site as the URL.
   local current_host = mw.uri.new(mw.title.getCurrentTitle():fullUrl()).host -- Get the host portion of the current page URL.
   if host == current_host then
       return nil, lang, host_id
   end
   
   -- Check if the URL language is the same as the current language.
   local same_lang
   if lang and lang == mw.ustring.match(current_host, "^(.-)%.") then
       same_lang = true
   end
   
   -- Check if the project is the same as the current project (but a different language).
   local current_host_id = getHostId(current_host)
   local same_project
   if current_host_id == host_id then
       same_project = true
   end
   
   -- Return the interwiki prefix, omitting the language or the project code if
   -- it is not necessary.
   local project = interwiki_table[host_id].iw_prefix[1]
   if same_lang or ( not lang and interwiki_table[host_id].takes_lang_prefix == false ) then
       return project, lang, host_id
   elseif same_project then
       return lang, lang, host_id
   elseif not lang then -- If the language code is bad but the rest of the host name is ok.
       return nil, nil, host_id
   else
       return project .. ":" .. lang, lang, host_id
   end   

end

local function _urlToWiki(args)

   local url = args[1] or error("لم يتم تحديد رابط!")
   url = mw.text.trim(url) -- Trim whitespace.
   url = mw.uri.new(url)
   local host = url.host -- Get the host name.
   -- Get the interwiki prefix. Lang and host_id are passed through so we don't have to work them out again.
   local interwiki, lang, host_id
   if host then
       interwiki, lang, host_id = getInterwiki(host)
   end
   local link = true -- This decides whether the resulting wikitext will be linked or not. Default is yes.
   if args.link == "no" then
       link = false -- Let users override the default.
   end
   
   -- Get the page title.
   local pagetitle, title_prefix
   if host_id and not ( interwiki_table[host_id].takes_lang_prefix == true and not lang ) then
       title_prefix = interwiki_table[host_id].title_prefix
   end
   -- If the URL path starts with the title prefix in the interwiki table, use that to get the title.
   if title_prefix and mw.ustring.sub(url.path, 1, mw.ustring.len(title_prefix)) == title_prefix then
       pagetitle = mw.ustring.sub(url.path, mw.ustring.len(title_prefix) + 1, -1)
   -- Else, if the URL is a history "index.php", use url.query.title. Check for host_id
   -- in case the URL isn't of a Wikimedia site.
   elseif host_id and mw.ustring.match(url.path, "index%.php") and url.query.title then
       pagetitle = url.query.title
   -- Special case for Bugzilla.
   elseif host_id == "bugzilla" and url.query.id then
       pagetitle = url.query.id
   elseif host_id == "bugzilla" and not url.query.id then
       interwiki = false -- disable the interwiki prefix as we are returning a full URL.
       link = false -- don't use double square brackets for URLs.
       pagetitle = tostring(url)
   -- If the URL is valid but not a recognised interwiki, return the URL and don't link it.
   elseif host and not host_id then
       link = false -- Don't use double square brackets for URLs.
       pagetitle = tostring(url)
   -- Otherwise, return whatever text we were passed and link it.
   else
       pagetitle = tostring(url)
   end
   
   -- Get the fragment and pre-process percent-encoded characters.
   local fragment = url.fragment
   if fragment then
       fragment = mw.ustring.gsub(fragment, "%.([0-9A-F][0-9A-F])", "%%%1")
   end
   
   -- Assemble the wikilink.
   local wikitext = pagetitle
   if interwiki then
       wikitext = interwiki .. ":" .. wikitext
   end
   if fragment and not (args.section == "no") then
       wikitext = wikitext .. "#" .. fragment
   end
   
   -- Decode percent-encoded characters and convert underscores to spaces.
   wikitext = mw.uri.decode(wikitext, "WIKI")
   -- If the wikitext is to be linked, re-encode illegal characters. Don't re-encode 
   -- characters from invalid URLs to make the default [[{{{1}}}]] display correctly.
   if link and host then
       wikitext = mw.ustring.gsub(wikitext, "[<>%[%]|{}%c?\n]", mw.uri.encode)
   end
   
   -- Use the Help:Colon trick with categories, interwikis, and files.
   local colon_prefix = mw.ustring.match(wikitext, "^(.-):.*$") or "" -- Get the text before the first colon.
   local current_lang = mw.language.getContentLanguage()
   local ns = mw.site.namespaces
   local need_colon_trick
   if mw.language.isSupportedLanguage(colon_prefix) -- Check for interwiki links.
   or current_lang:lc(ns[6].name) == current_lang:lc(colon_prefix) -- Check for files.
   or current_lang:lc(ns[14].name) == current_lang:lc(colon_prefix) then -- Check for categories.
       need_colon_trick = true
   end
   for i,v in ipairs(ns[6].aliases) do -- Check for file namespace aliases.
       if current_lang:lc(v) == current_lang:lc(colon_prefix) then
           need_colon_trick = true
           break
       end
   end
   for i,v in ipairs(ns[14].aliases) do -- Check for category namespace aliases.
       if current_lang:lc(v) == current_lang:lc(colon_prefix) then
           need_colon_trick = true
           break
       end
   end
   -- Don't use the colon trick if the user says so or if we are not linking
   -- (due to bugzilla:12974).
   if need_colon_trick and link and not (args.colontrick == "no") then
       wikitext = ":" .. wikitext
   end
   
   -- Add the link
   if link then
       local display = args[2] -- The display text in piped links.
       if display then
           if type(display) ~= "string" then
               error("Non-string display value detected")
           end
           display = mw.text.trim(display) -- Trim whitespace.
           wikitext = wikitext .. "|" .. display
       end
       wikitext = "" .. wikitext .. ""
   end
   
   return wikitext

end

function p.urlToWiki(frame)

   local origArgs
   if frame == mw.getCurrentFrame() then
       -- We're being called via #invoke. If the invoking template passed any args, use
       -- them. Otherwise, use the args that were passed into the template.
       origArgs = frame:getParent().args
       for k, v in pairs(frame.args) do
           origArgs = frame.args
           break
       end
   else
       -- We're being called from another module or from the debug console, so assume
       -- the args are passed in directly.
       origArgs = frame
   end
   
   -- ParserFunctions considers the empty string to be false, so to preserve the previous 
   -- behavior of the template, change any empty arguments to nil, so Lua will consider
   -- them false too.
   local args = {}
   for k, v in pairs(origArgs) do
       if mw.ustring.match(v, '%S') then
           args[k] = v
       end
   end
   return _urlToWiki(args)

end

return p