-- This module implements  local q = {} local Navbox = require('Module:Navbox')  -- helper functions local function concatstrings(s) 	local r = table.concat(s, ) 	if r:match('^%s*$') then r = nil end 	return r end  local function concatstyles(s) 	local r = table.concat(s, ';') 	while r:match(';%s*;') do 		r = mw.ustring.gsub(r, ';%s*;', ';') 	end 	if r:match('^%s*;%s*$') then r = nil end 	return r end  function q._navbox(pargs) 	-- table for args passed to navbox 	local targs = {}  	-- process args 	local passthrough = { 		['name']=true,['navbar']=true,['state']=true,['border']=true, 		['bodyclass']=true,['groupclass']=true,['listclass']=true, 		['style']=true,['bodystyle']=true,['basestyle']=true, 		['title']=true,['titleclass']=true,['titlestyle']=true, 		['above']=true,['aboveclass']=true,['abovestyle']=true, 		['below']=true,['belowclass']=true,['belowstyle']=true, 		['image']=true,['imageclass']=true,['imagestyle']=true, 		['imageleft']=true,['imageleftstyle']=true 	} 	for k,v in pairs(pargs) do 		if k and type(k) == 'string' then 			if passthrough[k] then 				targs[k] = v 			elseif (k:match('^list[0-9][0-9]*$')  					or k:match('^content[0-9][0-9]*$') ) then 				local n = mw.ustring.gsub(k, '^[a-z]*([0-9]*)$', '%1') 				if (targs['list' .. n] == nil and pargs['group' .. n] == nil 					and pargs['sect' .. n] == nil and pargs['section' .. n] == nil) then 					targs['list' .. n] = concatstrings( 						{pargs['list' .. n] or , pargs['content' .. n] or }) 				end 			elseif (k:match('^group[0-9][0-9]*$')  					or k:match('^sect[0-9][0-9]*$')  					or k:match('^section[0-9][0-9]*$') ) then 				local n = mw.ustring.gsub(k, '^[a-z]*([0-9]*)$', '%1') 				if targs['list' .. n] == nil then 					local titlestyle = concatstyles( 						{pargs['groupstyle'] or ,pargs['secttitlestyle'] or ,  							pargs['group' .. n .. 'style'] or ,  							pargs['section' .. n ..'titlestyle'] or }) 					local liststyle = concatstyles( 						{pargs['liststyle'] or , pargs['contentstyle'] or ,  							pargs['list' .. n .. 'style'] or ,  							pargs['content' .. n .. 'style'] or }) 					local title = concatstrings( 						{pargs['group' .. n] or ,  							pargs['sect' .. n] or , 							pargs['section' .. n] or }) 					local list = concatstrings( 						{pargs['list' .. n] or ,  							pargs['content' .. n] or }) 					local state = (pargs['abbr' .. n] and pargs['abbr' .. n] == pargs['selected'])  						and 'uncollapsed' or pargs['state' .. n] or 'collapsed' 					 					targs['list' .. n] = Navbox._navbox( 						{'child', navbar = 'plain', state = state, 						basestyle = pargs['basestyle'], 						title = title, titlestyle = titlestyle, 						list1 = list, liststyle = liststyle, 						listclass = pargs['list' .. n .. 'class'], 						image = pargs['image' .. n], 						imageleft = pargs['imageleft' .. n], 						listpadding = pargs['listpadding']}) 				end 			end 		end 	end 	-- ordering of style and bodystyle 	targs['style'] = concatstyles({targs['style'] or , targs['bodystyle'] or }) 	targs['bodystyle'] = nil 	 	-- child or subgroup 	if targs['border'] == nil then targs['border'] = pargs[1] end  	return Navbox._navbox(targs) end  function q.navbox(frame) 	local pargs = require('Module:Arguments').getArgs(frame, {wrappers = {'টেমপ্লেট:Navbox with collapsible groups'}})  	-- Read the arguments in the order they'll be output in, to make references number in the right order. 	local _ 	_ = pargs.title 	_ = pargs.above 	for i = 1, 20 do 		_ = pargs["group" .. tostring(i)] 		_ = pargs["list" .. tostring(i)] 	end 	_ = pargs.below  	return q._navbox(pargs) end  return q