Module:UrlToWiki

-- from https://en.wikipedia.org/wiki/Module:UrlToWiki see there for full details

-- 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.

local p = {} local current_lang = mw.language.getContentLanguage

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

local function getHostId(host) if type(host) ~= "string" then return end for id, t in pairs(interwiki_table) do if mw.ustring.match(host, t.domain) and t.domain_primary then -- Match partial domains (e.g. "www.foo.org" and "foo.org") but don't match non-primary domains. return id		end end end

local function getInterwiki(host) -- This function returns a table with information about the interwiki prefix of the specified host. local ret = {}

-- Return a blank table for invalid input. if type(host) ~= "string" then return ret end

-- Get the host ID. host = mw.ustring.lower(host) local host_id = getHostId(host) if not host_id then return ret end ret.host_id = host_id

-- 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 ret.lang = lang

-- 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 ret 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

-- Find the interwiki prefix. local interwiki 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 interwiki = project elseif same_project then interwiki = lang elseif not lang then -- If the language code is bad but the rest of the host name is ok. interwiki = nil else interwiki = project .. ":" .. lang end ret.interwiki = interwiki

return ret end

function p._urlToWiki(args) -- Check the input is valid.

local input = args[1] or args.url if type(input) ~= "string" then if args.error ~= "no" then if type(input) == "nil" then error("No URL specified", 2) else error("The URL must be a string value", 2) end else return "" end end input = mw.text.trim(input)

-- Get the URI object. url = mw.uri.new(input) local host = url.host

-- Get the interwiki prefix. local interwiki, lang, host_id if host then local iw_data = getInterwiki(host) interwiki, lang, host_id = iw_data.interwiki, iw_data.lang, iw_data.host_id 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 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, use 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, use our original input minus any fragment else pagetitle = mw.ustring.match(input, "^(.-)#") or input end

-- Get the fragment and pre-process percent-encoded characters. local fragment = url.fragment -- This also works for non-urls like "Foo#Bar". 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 display correctly. if link and host then wikitext = mw.ustring.gsub(wikitext, "[<>%[%]|{}%c\n]", mw.uri.encode) end

-- Find the display value local display if link then display = args[2] or args.display -- The display text in piped links. if (display and type(display) ~= "string") then if args.error ~= "no" then error("Non-string display value detected") else display = nil end end if display then display = mw.text.trim(display) -- Trim whitespace. -- If the page name is the same as the display value, don't pipe -- the link. if current_lang:lcfirst(wikitext) == display then wikitext = display display = nil elseif wikitext == display then display = nil end end 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 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 12974). if need_colon_trick and link and args.colontrick ~= "no" then wikitext = ":" .. wikitext end

-- Make the link if link then if display then wikitext = wikitext .. '|' .. display end wikitext = "" .. wikitext .. "" end

return wikitext end

function p.urlToWiki(frame) local args = require('Module:Arguments').getArgs(frame, {		wrappers = {'Template:Urltowiki','Template:Urltowiki/sandbox'}	}) return p._urlToWiki(args) end

return p