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    Ballmedia

    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.
    -- <nowiki>
    local libUtil = require('libraryUtil')
    local checkType = libUtil.checkType
    local mTableTools = {}
    local infinity = math.huge
    local floor = math.floor
    local p = {}
    
    local listTypes = {
    	['bulleted'] = true,
    	['unbulleted'] = true,
    	['horizontal'] = true,
    	['ordered'] = true,
    	['horizontal_ordered'] = true
    }
    
    function mTableTools.isPositiveInteger(v)
    	if type(v) == 'number' and v >= 1 and floor(v) == v and v < infinity then
    		return true
    	else
    		return false
    	end
    end
    
    function mTableTools.numKeys(t)
    	checkType('numKeys', 1, t, 'table')
    	local isPositiveInteger = mTableTools.isPositiveInteger
    	local nums = {}
    	for k, v in pairs(t) do
    		if isPositiveInteger(k) then
    			nums[#nums + 1] = k
    		end
    	end
    	table.sort(nums)
    	return nums
    end
    
    function p.makeListData(listType, args)
    	-- Constructs a data table to be passed to p.renderList.
    	local data = {}
    
    	-- Classes
    	data.classes = {}
    	if listType == 'horizontal' or listType == 'horizontal_ordered' then
    		table.insert(data.classes, 'hlist')
    	elseif listType == 'unbulleted' then
    		table.insert(data.classes, 'plainlist')
    	end
    	table.insert(data.classes, args.class)
    
    	-- Main div style
    	data.style = args.style
    
    	-- Indent for horizontal lists
    	if listType == 'horizontal' or listType == 'horizontal_ordered' then
    		local indent = tonumber(args.indent)
    		indent = indent and indent * 1.6 or 0
    		if indent > 0 then
    			data.marginLeft = indent .. 'em'
    		end
    	end
    	
    	-- List style types for ordered lists
    	-- This could be "1, 2, 3", "a, b, c", or a number of others. The list style
    	-- type is either set by the "type" attribute or the "list-style-type" CSS
    	-- property.
    	if listType == 'ordered' or listType == 'horizontal_ordered' then 
    		data.listStyleType = args.list_style_type or args['list-style-type']
    		data.type = args['type']
    
    		-- Detect invalid type attributes and attempt to convert them to
    		-- list-style-type CSS properties.
    		if data.type 
    			and not data.listStyleType
    			and not tostring(data.type):find('^%s*[1AaIi]%s*$')
    		then
    			data.listStyleType = data.type
    			data.type = nil
    		end
    	end
    	
    	-- List tag type
    	if listType == 'ordered' or listType == 'horizontal_ordered' then
    		data.listTag = 'ol'
    	else
    		data.listTag = 'ul'
    	end
    
    	-- Start number for ordered lists
    	data.start = args.start
    	if listType == 'horizontal_ordered' then
    		-- Apply fix to get start numbers working with horizontal ordered lists.
    		local startNum = tonumber(data.start)
    		if startNum then
    			data.counterReset = 'listitem ' .. tostring(startNum - 1)
    		end
    	end
    
    	-- List style
    	 -- ul_style and ol_style are included for backwards compatibility. No
    	 -- distinction is made for ordered or unordered lists.
    	data.listStyle = args.list_style
    
    	-- List items
    	-- li_style is included for backwards compatibility. item_style was included
    	-- to be easier to understand for non-coders.
    	data.itemStyle = args.item_style or args.li_style
    	data.items = {}
    	for i, num in ipairs(mTableTools.numKeys(args)) do
    		local item = {}
    		item.content = args[num]
    		item.style = args['item' .. tostring(num) .. '_style']
    			or args['item_style' .. tostring(num)]
    		item.value = args['item' .. tostring(num) .. '_value']
    			or args['item_value' .. tostring(num)]
    		table.insert(data.items, item)
    	end
    	
    	return data
    end
    
    function p.renderList(data)
    	-- Renders the list HTML.
    	
    	-- Return the blank string if there are no list items.
    	if type(data.items) ~= 'table' or #data.items < 1 then
    		return ''
    	end
    	
    	-- Render the main div tag.
    	local root = mw.html.create('div')
    	for i, class in ipairs(data.classes or {}) do
    		root:addClass(class)
    	end
    	root:css{['margin-left'] = data.marginLeft}
    	if data.style then
    		root:cssText(data.style)
    	end
    
    	-- Render the list tag.
    	local list = root:tag(data.listTag or 'ul')
    	list
    		:attr{start = data.start, type = data.type}
    		:css{
    			['counter-reset'] = data.counterReset,
    			['list-style-type'] = data.listStyleType
    		}
    	if data.listStyle then
    		list:cssText(data.listStyle)
    	end
    
    	-- Render the list items
    	for i, t in ipairs(data.items or {}) do
    		local item = list:tag('li')
    		if data.itemStyle then
    			item:cssText(data.itemStyle)
    		end
    		if t.style then
    			item:cssText(t.style)
    		end
    		item
    			:attr{value = t.value}
    			:wikitext(t.content)
    	end
    
    	return tostring(root)
    end
    
    function p.renderTrackingCategories(args)
    	local isDeprecated = false -- Tracks deprecated parameters.
    	for k, v in pairs(args) do
    		k = tostring(k)
    		if k:find('^item_style%d+$') or k:find('^item_value%d+$') then
    			isDeprecated = true
    			break
    		end
    	end
    	local ret = ''
    	if isDeprecated then
    		ret = ret .. '[[Category:List templates with deprecated parameters]]'
    	end
    	return ret
    end
    
    function p.makeList(listType, args)
    	if not listType or not listTypes[listType] then
    		error(string.format(
    			"bad argument #1 to 'makeList' ('%s' is not a valid list type)",
    			tostring(listType)
    		), 2)
    	end
    	checkType('makeList', 2, args, 'table')
    	local data = p.makeListData(listType, args)
    	local list = p.renderList(data)
    	local trackingCategories = p.renderTrackingCategories(args)
    	return list .. trackingCategories
    end
    
    for listType in pairs(listTypes) do
    	p[listType] = function (frame)
    		local mArguments = require('Dev:Arguments')
    		local origArgs = mArguments.getArgs(frame)
    		-- Copy all the arguments to a new table, for faster indexing.
    		local args = {}
    		for k, v in pairs(origArgs) do
    			args[k] = v
    		end
    		return p.makeList(listType, args)
    	end
    end
    
    return p
    
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