Module:Delink

-- This module de-links most wikitext.

local p = {}

local function delinkReversePipeTrick(s) if s:match("^%[%[|.*[|\n]") then -- Check for newlines or multiple pipes. return s   else return s:match("%[%[|(.*)%]%]") end end

local function delinkPipeTrick(s) local linkarea, display = "", "" -- We need to deal with colons, brackets, and commas, per Help:Pipe trick. -- First, remove the text before the first colon, if any. if s:match(":") then s = s:match("%[%[.-:(.*)|%]%]") -- If there are no colons, grab all of the text apart from the square brackets and the pipe. else s = s:match("%[%[(.*)|%]%]") end -- Next up, brackets and commas. if s:match("%(.-%)$") then -- Brackets trump commas. s = s:match("(.-) ?%(.-%)$") elseif s:match(",") then -- If there are no brackets, display only the text before the first comma. s = s:match("(.-),.*$") end return s end

local function delinkWikilink(s) local result = s   -- Deal with the reverse pipe trick. if result:match("%[%[|") then return delinkReversePipeTrick(result) end result = mw.uri.decode(result, "PATH") -- decode percent-encoded entities. Leave underscores and plus signs. result = mw.text.decode(result, true) -- decode HTML entities. -- Check for bad titles. To do this we need to find the -- title area of the link, i.e. the part before any pipes. local titlearea if result:match("|") then -- Find if we're dealing with a piped link. titlearea = result:match("^%[%[(.-)|.*%]%]") else titlearea = result:match("^%[%[(.-)%]%]") end -- Check for bad characters. if mw.ustring.match(titlearea, "[%[%]<>{}%%%c\n]") then return s   end -- Check for categories, interwikis, and files. local colonprefix = result:match("%[%[(.-):.*%]%]") or "" -- Get the text before the first colon. local ns = mw.site.namespaces[colonprefix] -- see if this is a known namespace if mw.language.isKnownLanguageTag(colonprefix) or ( ns and ( ns.canonicalName == "File" or ns.canonicalName == "Category" ) ) then return "" end -- Remove the colon if the link is using the Help:Colon trick. if result:match("%[%[:") then result = "" .. result:match("%[%[:(.*%]%])")   end    -- Deal with links using the [[Help:Pipe trick.    if mw.ustring.match(result, "^%[%[[^|]*|%]%]") then        return delinkPipeTrick(result)    end    -- Find the display area of the wikilink    if result:match("|") then -- Find if we're dealing with a piped link.        result = result:match("^%[%[.-|(.+)%]%]")        -- Remove new lines from the display of multiline piped links,        -- where the pipe is before the first new line.        result = result:gsub("\n", "")    else        result = result:match("^%[%[(.-)%]%]")    end

return result end

local function delinkURL(s) -- Assume we have already delinked internal wikilinks, and that -- we have been passed some text between two square brackets [foo]. -- If the text contains a line break it is not formatted as a URL, regardless of other content. if s:match("\n") then return s   end -- Check if the text has a valid URL prefix and at least one valid URL character. local valid_url_prefixes = {"//", "http://", "https://", "ftp://", "gopher://", "mailto:", "news:", "irc://"} local url_prefix for i,v in ipairs(valid_url_prefixes) do       if mw.ustring.match(s, '^%[' .. v ..'[^"%s].*%]' ) then            url_prefix = v            break        end    end    -- Get display text    if not url_prefix then        return s    end    s = s:match("^%[" .. url_prefix .. "(.*)%]") -- Grab all of the text after the URL prefix and before the final square bracket.    s = s:match('^.-(["<> ].*)') or "" -- Grab all of the text after the first URL separator character ("<> ).    s = mw.ustring.match(s, "^%s*(%S.*)$") or "" -- If the separating character was a space, trim it off.    s_decoded = mw.text.decode(s, true)    if mw.ustring.match(s_decoded, "%c") then        return s    else            return s_decoded    end end

local function delinkLinkClass(s, pattern, delinkFunction) if not type(s) == "string" then error("Attempt to de-link non-string input.", 2) end if not ( type(pattern) == "string" and mw.ustring.sub(pattern, 1, 1) == "^" ) then error('Invalid pattern detected. Patterns must begin with "^".', 2) end -- Iterate over the text string, and replace any matched text. using the -- delink function. We need to iterate character by character rather -- than just use gsub, otherwise nested links aren't detected properly. local result = "" while s ~= '' do       -- Replace text using one iteration of gsub. s = mw.ustring.gsub(s, pattern, delinkFunction, 1) -- Append the left-most character to the result string. result = result .. mw.ustring.sub(s, 1, 1) s = mw.ustring.sub(s, 2, -1) end return result end

function p._delink(args) local text = args[1] or "" if args.refs == "yes" then -- Remove any Help:Strip markers representing ref tags. In most situations -- this is not a good idea - only use it if you know what you are doing! text = mw.ustring.gsub(text, "UNIQ%w*%-ref%-%d*%-QINU", "") end if not (args.comments == "no") then text = text:gsub("<!%-%-.-%-%->", "") -- Remove html comments. end if not (args.wikilinks == "no") then text = delinkLinkClass(text, "^%[%[.-%]%]", delinkWikilink) -- De-link wikilinks. end if not (args.urls == "no") then text = delinkLinkClass(text, "^%[.-%]", delinkURL) -- De-link URLs. end if not (args.whitespace == "no") then -- Replace single new lines with a single space, but leave double new lines -- and new lines only containing spaces or tabs before a second new line. text = mw.ustring.gsub(text, "([^\n \t][ \t]*)\n([ \t]*[^\n \t])", "%1 %2") text = text:gsub("[ \t]+", " ") -- Remove extra tabs and spaces. end return text end

function p.delink(frame) local args 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. args = frame:getParent.args for k, v in pairs(frame.args) do           args = 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. args = frame end return p._delink(args) end

return p