Module:List

Documentation for this module may be created at Module:List/doc

-- This module outputs different kinds of lists. At the moment, bulleted, unbulleted,
-- horizontal, ordered, and horizontal ordered lists are supported.

local p = {}

local htmlBuilder = require('Module:HtmlBuilder')

local function getListItem(data, style, itemStyle)
	if not data then
		return nil
	end
	local item = htmlBuilder.create('li')
	item
		.cssText(style)
		.cssText(itemStyle)
		.wikitext(data)
	return tostring(item)
end

local function getArgNums(args)
	-- Returns an array containing the keys of all positional arguments
	-- that contain data (i.e. non-whitespace values).
	local nums = {}
	for k, v in pairs(args) do
		if type(k) == 'number' and 
			k >= 1 and 
			math.floor(k) == k and 
			mw.ustring.match(v, '%S') then
				table.insert(nums, k)
		end
	end
	table.sort(nums)
	return nums
end

function p.makeList(listType, args)
	-- This is the main function to be called from other Lua modules.
	-- First, get the list items.
	local listItems = {}
	local argNums = getArgNums(args)
	for i, num in ipairs(argNums) do
		local item = getListItem(
			args[num],
			args.item_style or args.li_style, -- li_style is included for backwards compatibility. item_style was included to be easier to understand for non-coders.
			args['item_style' .. tostring(num)] or args['li_style' .. tostring(num)]
		)
		table.insert(listItems, item)
	end
	if #listItems == 0 then
		return ''
	end
	-- Build the list html.
	local root = htmlBuilder.create('div')
	if listType == 'horizontal' or listType == 'horizontal_ordered' then
		root.addClass('hlist')
	elseif listType == 'unbulleted' then
		root.addClass('plainlist')
	end
	root.addClass(args.class)
	if listType == 'horizontal' or listType == 'horizontal_ordered' then
		local indent = tonumber(args.indent)
		indent = tostring((indent and indent * 1.6) or 0)
		root.css('margin-left', indent .. 'em')
	end
	root.cssText(args.style)
	local list = root.tag((listType == 'ordered' or listType == 'horizontal_ordered') and 'ol' or 'ul')
	list
		.attr('start', args.start)
		.attr('type', args.type)
		.css('list-style-type', args.list_style_type or args['list-style-type'])
		.cssText(args.list_style or args.ul_style or args.ol_style) -- ul_style and ol_style are included for backwards compatibility. No distinction is made for ordered or unordered lists.
		.wikitext(table.concat(listItems))
	return tostring(root)
end

local function makeWrapper(listType)
	return function(frame)
		local origArgs
		if frame == mw.getCurrentFrame() then
			origArgs = frame:getParent().args
			for k, v in pairs(frame.args) do
				origArgs = frame.args
				break
			end
		else
			origArgs = frame
		end
		
		local args = {}
		for k, v in pairs(origArgs) do
			if type(k) == 'number' or v ~= '' then
				args[k] = v
			end
		end
		return p.makeList(listType, args)
	end
end

local funcNames = {'bulleted', 'unbulleted', 'horizontal', 'ordered', 'horizontal_ordered'}

for _, funcName in ipairs(funcNames) do
	p[funcName] = makeWrapper(funcName)
end

return p