Module:Navbox with collapsible groups

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

-- This module implements {{Navbox with collapsible groups}}
local p = {}

local Navbox = require('Module:Navbox')
local getArgs -- lazily initialized

-- helper functions
local function concatstrings(t)
	local res = table.concat(t, '')
	if res:match('^%s*$') then res = nil end
	return res
end

local function concatstyles(t)
	local res = table.concat(t, ';')
	while res:match(';%s*;') do
		res = mw.ustring.gsub(res, ';%s*;', ';')
	end
	if res:match('^%s*;%s*$') then res = nil end
	return res
end

function p._navbox(args)
	-- table for args passed to navbox
	local targs = {}

	-- process args
	local passthrough = {
		['name']=1,['navbar']=1,['state']=1,['border']=1,
		['bodyclass']=1,['groupclass']=1,['listclass']=1,
		['style']=1,['bodystyle']=1,['basestyle']=1,
		['title']=1,['titleclass']=1,['titlestyle']=1,
		['above']=1,['aboveclass']=1,['abovestyle']=1,
		['below']=1,['belowclass']=1,['belowstyle']=1,
		['image']=1,['imageclass']=1,['imagestyle']=1,
		['imageleft']=1,['imageleftstyle']=1
	}
	for k,v in pairs(args) 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]*)$', '%1')
				if (targs['list' .. n] == nil and args['group' .. n] == nil
					and args['sect' .. n] == nil and args['section' .. n] == nil) then
					targs['list' .. n] = (args['list' .. n] or '') .. (args['content' .. n] or '')
				end
			elseif (k:match('^group[0-9][0-9]*$') 
					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(
						{args['groupstyle'] or '',args['secttitlestyle'] or '', 
							args['group' .. n .. 'style'] or '', 
							args['section' .. n ..'titlestyle'] or ''})
					local liststyle = concatstyles(
						{args['liststyle'] or '', args['contentstyle'] or '', 
							args['list' .. n .. 'style'] or '', 
							args['content' .. n .. 'style'] or ''})
					local title = concatstrings(
						{args['group' .. n] or '', 
							args['sect' .. n] or '',
							args['section' .. n] or ''})
					local list = concatstrings(
						{args['list' .. n] or '', 
							args['content' .. n] or ''})
					local state = (args['abbr' .. n] and args['abbr' .. n] == args['selected']) 
						and 'uncollapsed' or args['state' .. n] or 'collapsed'

					targs['list' .. n] = Navbox._navbox(
						{navbar = 'plain', state = state,
						basestyle = args['basestyle'],
						title = title, titlestyle = titlestyle,
						list = list, liststyle = liststyle,
						listclass = args['list' .. n .. 'class'],
						image = args['image' .. n],
						imageleft = args['imageleft' .. n],
						listpadding = args['listpadding']})
				end
			end
		end
	end
	
	-- child or subgroup
	if targs['border'] == nil then targs['border'] = args[1] end

	return Navbox._navbox(targs)
end

function p.navbox(frame)
	if not getArgs then
		getArgs = require('Module:Arguments').getArgs
	end
	args = 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 _
	_ = args.title
	_ = args.above
	for i = 1, 20 do
		_ = args["group" .. tostring(i)]
		_ = args["list" .. tostring(i)]
	end
	_ = args.below

	return p._navbox(args)
end

return p