Module:List

This module outputs various kinds of lists. At present, it supports bulleted lists, unbulleted lists, horizontal lists, ordered lists (numbered or alphabetical), and horizontal ordered lists. It allows for easy css styling of the list or of the individual list items.

Usage

Quick usage

All parameters

Arguments passed from parent template

Functions

Function name	Produces	Example output	Template using the function
bulleted	Bulleted lists		{{bulleted list}}
unbulleted	Unbulleted lists		{{unbulleted list}}
horizontal	Horizontal bulleted lists		{{hlist}}
ordered	Ordered lists (numbered lists and alphabetical lists)		{{ordered list}}
horizontal_ordered	Horizontal ordered lists		{{horizontal ordered list}}

Parameters

• Positional parameters (1, 2, 3...) - these are the list items. If no list items are present, the module will output nothing.
• start - sets the start item for ordered lists. This can be a start number for numbered lists, or a start letter for alphabetical lists. Horizontal ordered lists only support numbers.
• type - the type of marker used in ordered lists. Possible values are "1" for numbers (the default), "A" for uppercase letters, "a" for lowercase letters, "I" for uppercase Roman numerals, and "i" for lowercase Roman numerals. Not supported in horizontal ordered lists. See also the list_style_type parameter.
• list_style_type - the type of marker used in ordered lists. This uses CSS styling, and has more types available than the type parameter, which uses an html attribute. Possible values are listed at MDN's list-style-type page. Support may vary by browser. list-style-type is an alias for this parameter.
• class - a custom class for the <div>...</div> tags surrounding the list, e.g. plainlinks.
• style - a custom css style for the <div>...</div> tags surrounding the list, e.g. font-size: 90%;.
• list_style - a custom css style for the list itself. The format is the same as for the |style= parameter.
• item_style - a custom css style for all of the list items (the <li>...</li> tags). The format is the same as for the |style= parameter.
• item1_style, item2_style, item3_style... - custom css styles for each of the list items. The format is the same as for the |style= parameter.
• item1_value, item2_value, item3_value... - custom value for the given list item. List items following the one given will increment from the specified value. The value should be a positive integer. (Note that this option only has an effect on ordered lists.)
• indent - this parameter indents the list, for horizontal and horizontal ordered lists only. The value must be a number, e.g. 2. The indent is calculated in em, and is 1.6 times the value specified. If no indent is specified, the default is zero.

Examples

Bulleted lists

Code	Result
{{#invoke:list|bulleted|First item|Second item|Third item}}
{{#invoke:list|bulleted|First item|Second item|Third item|item_style=color:blue;}}
{{#invoke:list|bulleted|First item|Second item|Third item|item1_style=background-color:yellow;|item2_style=background-color:silver;}}

Unbulleted lists

Code	Result
{{#invoke:list|unbulleted|First item|Second item|Third item}}
{{#invoke:list|unbulleted|First item|Second item|Third item|item_style=color:blue;}}
{{#invoke:list|unbulleted|First item|Second item|Third item|item1_style=background-color:yellow;|item2_style=background-color:silver;}}

Horizontal lists

Code	Result
{{#invoke:list|horizontal|First item|Second item|Third item}}
{{#invoke:list|horizontal|First item|Second item|Third item|indent=2}}

Ordered lists

Code	Result
{{#invoke:list|ordered|First item|Second item|Third item}}
{{#invoke:list|ordered|First item|Second item|Third item|start=3}}
Lowercase Roman numerals: {{#invoke:list|ordered|First item|Second item|Third item|type=i}}
Lowercase Greek alphabet: {{#invoke:list|ordered|First item|Second item|Third item|list_style_type=lower-greek}}

Horizontal ordered lists

Code	Result
{{#invoke:list|horizontal_ordered|First item|Second item|Third item}}
{{#invoke:list|horizontal_ordered|First item|Second item|Third item|start=3}}
{{#invoke:list|horizontal_ordered|First item|Second item|Third item|indent=2}}

Tracking/maintenance category

• Template:Clc

See also

• Module:Separated entries

---

-- 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, itemValue)
	if not data then
		return nil
	end
	local item = htmlBuilder.create('li')
	item
		.cssText(style)
		.cssText(itemStyle)
		.wikitext(data)
	if(itemValue) then
		item.attr('value',itemValue)
	end
	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)],
			args['item_value' .. 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