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

{{#invoke:list|function|first item|second item|third item|...}}

All parameters

{{#invoke:list|function
|first item|second item|third item|...
|start           = start number for ordered lists
|type            = type of numbering for ordered lists
|list_style_type = type of marker for ordered lists (uses CSS)
|class           = class
|style           = style
|list_style      = style for the list
|item_style      = style for all list items
|item1_style     = style for the first list item |item2_style = style for the second list item |...
|item1_value     = value for the first list item |item2_value = value for the second list item |...
|indent          = indent for horizontal lists
}}

Arguments passed from parent template

{{#invoke:list|function}}

Functions

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

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

Unbulleted lists

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

Horizontal lists

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

Ordered lists

Code	Result
{{#invoke:list|ordered|First item|Second item|Third item}}
{{#invoke:list|ordered|First item|Second item|Third item|start=3}}
{{#invoke:list|ordered|First item|Second item|Third item|type=i}
{{#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

• Category:List templates with deprecated parameters (0)

See also

• Module:Separated entries

---

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

local p = {}

local function getListItem(data, style, itemStyle)
	if not data then
		return nil
	end
	if style or itemStyle then
		style = style or ''
		itemStyle = itemStyle or ''
		return mw.ustring.format(
			'<li style="%s%s">%s</li>',
			style, itemStyle, data
		)
	else
		return mw.ustring.format(
			'<li>%s</li>',
			data
		)
	end
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

local function getClass(listType, class)
	local classes = {}
	if listType == 'horizontal' or listType == 'horizontal_numbered' then
		table.insert(classes, 'hlist')
	elseif listType == 'unbulleted' then
		table.insert(classes, 'plainlist')
	end
	table.insert(classes, class)
	local ret
	if #classes == 0 then
		return nil
	end
	return mw.ustring.format(' class="%s"', table.concat(classes, ' '))
end

local function getStyle(listType, indent, style)
	local styles = {}
	if listType == 'horizontal' or listType == 'horizontal_numbered' then
		indent = indent and tonumber(indent)
		indent = tostring((indent and indent * 1.6) or 0)
		table.insert(styles, 'margin-left: ' .. indent .. 'em;')
	end
	table.insert(styles, style)
	if #styles == 0 then
		return nil
	end
	return mw.ustring.format(' style="%s"', table.concat(styles, ' '))
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
	-- Check if we need a ul tag or an ol tag, and get the start and type attributes for ordered lists.
	local listTag = 'ul'
	local startAttr, typeAttr
	if listType == 'numbered' or listType == 'horizontal_numbered' then
		listTag = 'ol'
		startAttr = args.start
		if startAttr then
			startAttr = ' start="' .. startAttr .. '"'
		end
		typeAttr = args.type
		if typeAttr then
			typeAttr = ' type="' .. typeAttr .. '"'
		end
	end
	startAttr = startAttr or ''
	typeAttr = typeAttr or ''
	-- Get the classes and styles and output the list.
	local class = getClass(listType, args.class) or ''
	local style = getStyle(listType, args.indent, args.style) or ''
	local list_style = args.list_style or args.ul_style -- ul_style is included for backwards compatibility, and will work even with ordered lists.
	list_style = list_style and (' style="' .. list_style .. '"') or ''
	return mw.ustring.format(
		'<div%s%s><%s%s%s%s>%s</%s></div>',
		class, style, listTag, startAttr, typeAttr, list_style, table.concat(listItems), listTag
	)
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', 'numbered', 'horizontal_numbered'}

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

return p