-- This module implements   local p = {}  local Navbox = require('মডিউল:Navbox') local templatestyles = 'নাভবক্স কানাডা/রীতি.css'  function p.navbox(frame) 	-- table for args passed to navbox 	local targs = {}  	-- helper functions 	local function isnotempty(t) return t and t ~=  end 	local function prependarg(k, v)	targs[k] = v .. (targs[k] or ) end  	local listcount = 0 	local collapsiblegroups = nil 	local firstnum = 1 	local lastnum = 0 	local leaf = nil 	local borders = 	local ischild = nil 	local topborder, notopborder = nil, nil 	local bottomborder, nobottomborder = nil, nil 	local tstyles = frame:extensionTag{ name = 'templatestyles', args = { src = templatestyles} }  	-- process args, almost all of which are just copied to targs 	for k,v in pairs(frame:getParent().args) do 		if type(k) == 'string' and k:match('^list[0-9][0-9]*$') then 			if isnotempty(v) then 				listcount = listcount + 1 				local num = mw.ustring.gsub(k,'^list([0-9][0-9]*)$', '%1') 				firstnum = (tonumber(num) < firstnum or listcount == 1) and tonumber(num) or firstnum 				lastnum = (tonumber(num) > lastnum or listcount == 1) and tonumber(num) or lastnum 				targs[k] = v 			end 		elseif k == 'leaf' and isnotempty(v) then 			leaf = 1 		elseif k == 'collapsible groups' and isnotempty(v) then 			collapsiblegroups = 1 		elseif k == 'topborder' and isnotempty(v) then 			topborder = 1 		elseif k == 'notopborder' and isnotempty(v) then 			notopborder = 1 		elseif k == 'bottomborder' and isnotempty(v) then 			bottomborder = 1 		elseif k == 'nobottomborder' and isnotempty(v) then 			nobottomborder = 1 		elseif isnotempty(v) then 			targs[k] = v 		end 	end 	-- child or subgroup 	if targs['border'] or targs[1] or targs['1'] then 		local v = targs['border'] or targs[1] or targs['1'] 		if v == 'child' or v == 'subgroup' then 			ischild = 1 		end 	end  	-- hlist bodyclass 	prependarg('bodyclass', 'navbox-canada hlist ')  	-- leaf 	if leaf then 		prependarg('title',  				'' .. 				'20x20px|link=|alt=' ..  				' ') 	end  	-- aboveclass 	prependarg('aboveclass', 'navbox-canada-t ')  	-- groupclass 	prependarg('groupclass', 'navbox-canada-a ')  	-- imageclass 	if targs['image'] then 		borders = (notopborder == nil and 't' or ) 		if targs['below'] or ischild ~= nil then 			borders = borders .. (nobottomborder == nil and 'b' or ) 		else 			borders = borders .. (bottomborder == 1 and 'b' or ) 		end 		if borders ~=  then 			prependarg('imageclass', 'navbox-canada-' .. borders .. ' ') 		end 	end  	-- first and last list class 	if lastnum == firstnum then 		borders =  		if collapsiblegroups == nil and ischild == nil then 			borders = borders .. (notopborder == nil and 't' or ) 		end 		if targs['below'] or ischild ~= nil then 			borders = borders .. (nobottomborder == nil and 'b' or ) 		else 			borders = borders .. (bottomborder == 1 and 'b' or ) 		end 		if borders ~=  then 			prependarg('list' .. firstnum .. 'class', 'navbox-canada-' .. borders .. ' ') 		end 	elseif lastnum > firstnum then 		if collapsiblegroups == nil and notopborder == nil then 			prependarg('list' .. firstnum .. 'class', 'navbox-canada-t ') 		end 		if (targs['below'] and nobottomborder == nil) or (bottomborder == 1) then 			prependarg('list' .. lastnum .. 'class', 'navbox-canada-b ') 		end 	end  	-- hack for https://phabricator.wikimedia.org/T200206 	if targs['title'] and targs['title'] ~=  then 		prependarg('title', tstyles) 		tstyles =  	end 	-- pass the process args to navbox or navbox with collapsible groups 	if collapsiblegroups then 		return tstyles .. frame:expandTemplate{ title = 'Navbox with collapsible groups', args = targs } 	else 		return tstyles .. Navbox._navbox(targs) 	end  end  return p