Module:Delink

-- This module de-links most wikitext.

p = {}

local function delinkReversePipeTrick(s) if mw.ustring.match(s, "^%[%[|.*|") then -- Check for multiple pipes. return s   else return mw.ustring.match(s, "%[%[|(.*)%]%]") 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 mw.ustring.match(s, ":") then s = mw.ustring.match(s, "%[%[.-:(.*)|%]%]") -- If there are no colons, grab all of the text apart from the square brackets and the pipe. else s = mw.ustring.match(s, "%[%[(.*)|%]%]") end -- Next up, brackets and commas. if mw.ustring.match(s, "%(.-%)$") then -- Brackets trump commas. s = mw.ustring.match(s, "(.-) ?%(.-%)$") elseif mw.ustring.match(s, ",") then -- If there are no brackets, display only the text before the first comma. s = mw.ustring.match(s, "(.-),.*$") end return s end

local function delinkWikilink(s) -- Deal with the reverse pipe trick. if mw.ustring.match(s, "%[%[|") then return delinkReversePipeTrick(s) end -- 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 mw.ustring.match(s, "|") then -- Find if we're dealing with a piped link. titlearea = mw.ustring.match(s, "^%[%[(.-)|.*%]%]") else titlearea = mw.ustring.match(s, "^%[%[(.-)%]%]") end -- If the title area is not a valid title, return the whole string. -- Use pcall in case we're over the expensive functions limit. local goodcall, title = pcall(mw.title.new, titlearea, "") if not (goodcall and title) then return s   end -- Check for characters that are allowed in titles but not in wikilinks. local other_invalid_link_strings = { '&#x0000;' } for i,v in ipairs(other_invalid_link_strings) do       if mw.ustring.match(titlearea, v) then return s       end end -- Check for categories, interwikis, and files. local colonprefix = mw.ustring.match(s, "%[%[(.-):.*%]%]") or "" -- Get the text before the first colon. if mw.language.isKnownLanguageTag(colonprefix) or mw.ustring.match(colonprefix, "^[Cc]ategory$") or mw.ustring.match(colonprefix, "^[Ff]ile$") or mw.ustring.match(colonprefix, "^[Ii]mage$") then return "" end -- Remove the colon if the link is using the Help:Colon trick. if mw.ustring.match(s, "%[%[:") then s = "" .. mw.ustring.match(s, "%[%[:(.*%]%])")   end    -- Deal with links using the [[Help:Pipe trick.    if mw.ustring.match(s, "^%[%[[^|]*|%]%]") then        return delinkPipeTrick(s)    end    -- Find the display area of the wikilink    local display    if mw.ustring.match(s, "|") then -- Find if we're dealing with a piped link.        display = mw.ustring.match(s, "^%[%[.-|(.+)%]%]")    else        display = mw.ustring.match(s, "^%[%[(.-)%]%]")    end

return display 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]. -- 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    else        s = mw.ustring.match(s, "^%[" .. url_prefix .. "(.*)%]") -- Grab all of the text after the URL prefix and before the final square bracket.        s = mw.ustring.match(s, '^.-(["<> ].*)') 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.        return s    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 mw.ustring.len(s) > 0 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

local function _delink(args) local text = args[1] or "" text = mw.ustring.gsub(text, "<!%-%-.-%-%->", "") -- Remove html comments. text = delinkLinkClass(text, "^%[%[.-%]%]", delinkWikilink) -- De-link wikilinks. text = delinkLinkClass(text, "^%[.-%]", delinkURL) -- De-link URLs. text = mw.ustring.gsub(text, "%s+", " ") -- Remove extra whitespace. 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 _delink(args) end

return p