Module:Navbox with collapsible groups

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    Documentation for this module may be created at Module:Navbox with collapsible groups/doc

    -- This module implements {{Navbox with collapsible groups}}
    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 = {'Template: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