-- This module provides functions for getting the target of a redirect page.  local p = {}  -- Gets a mw.title object, using pcall to avoid generating script errors if we -- are over the expensive function count limit (among other possible causes). local function getTitle(...) 	local success, titleObj = pcall(mw.title.new, ...) 	if success then 		return titleObj 	else 		return nil 	end end  -- Gets the name of a page that a redirect leads to, or nil if it isn't a -- redirect. function p.getTargetFromText(text) 	local target = string.match( 		text, 		"^%s*#[Rr][Ee][Dd][Ii][Rr][Ee][Cc][Tt]%s*:?%s*%[%[([^%[%]|]-)%]%]" 	) or string.match( 		text, 		"^%s*#[Rr][Ee][Dd][Ii][Rr][Ee][Cc][Tt]%s*:?%s*%[%[([^%[%]|]-)|[^%[%]]-%]%]" 	) or string.match( 		text, 		"^%s*#পুনর্নির্দেশ%s*:?%s*%[%[([^%[%]|]-)%]%]" 	) 	return target and mw.uri.decode(target, 'PATH') end  -- Gets the target of a redirect. If the page specified is not a redirect, -- returns nil. function p.getTarget(page, fulltext) 	-- Get the title object. Both page names and title objects are allowed 	-- as input. 	local titleObj 	if type(page) == 'string' or type(page) == 'number' then 		titleObj = getTitle(page) 	elseif type(page) == 'table' and type(page.getContent) == 'function' then 		titleObj = page 	else 		error(string.format( 			"bad argument #1 to 'getTarget'" 				.. " (string, number, or title object expected, got %s)", 			type(page) 		), 2) 	end 	if not titleObj or not titleObj.isRedirect then 		return nil 	end 	 	-- Find the target by using string matching on the page content. 	local target = p.getTargetFromText(titleObj:getContent() or "") 	if target then 		local targetTitle = getTitle(target) 		if targetTitle then 			if fulltext then 				return targetTitle.fullText 			else 				return targetTitle.prefixedText 			end 		else 			return nil 		end 	else 		-- The page is a redirect, but matching failed. This indicates a bug in 		-- the redirect matching pattern, so throw an error. 		error(string.format( 			'could not parse redirect on page "%s"', 			fulltext and titleObj.fullText or titleObj.prefixedText 		)) 	end end  --[[ -- Given a single page name determines what page it redirects to and returns the -- target page name, or the passed page name when not a redirect. The passed -- page name can be given as plain text or as a page link. --  -- Returns page name as plain text, or when the bracket parameter is given, as a -- page link. Returns an error message when page does not exist or the redirect -- target cannot be determined for some reason. --]] function p.luaMain(rname, bracket, fulltext) 	if type(rname) ~= "string" or not rname:find("%S") then 		return nil 	end 	bracket = bracket and "%s" or "%s" 	rname = rname:match("%[%[(.+)%]%]") or rname 	local target = p.getTarget(rname, fulltext) 	local ret = target or rname 	ret = getTitle(ret) 	if ret then 		if fulltext then 			ret = ret.fullText 		else 			ret = ret.prefixedText 		end 		return bracket:format(ret) 	else 		return nil 	end end  -- Provides access to the luaMain function from wikitext. function p.main(frame) 	local args = require('Module:Arguments').getArgs(frame, {frameOnly = true}) 	return p.luaMain(args[1], args.bracket, args.fulltext) or end  -- Returns true if the specified page is a redirect, and false otherwise. function p.luaIsRedirect(page) 	local titleObj = getTitle(page) 	if not titleObj then 		return false 	end 	if titleObj.isRedirect then 		return true 	else 		return false 	end end  -- Provides access to the luaIsRedirect function from wikitext, returning 'yes' -- if the specified page is a redirect, and the blank string otherwise. function p.isRedirect(frame) 	local args = require('Module:Arguments').getArgs(frame, {frameOnly = true}) 	if p.luaIsRedirect(args[1]) then 		return 'yes' 	else 		return  	end end  return p