Module:Message box

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This Lua module is used on 3,600,000 pages.
To avoid large-scale disruption and unnecessary server load, any changes to this module should first be tested in its /sandbox or /testcases subpages. The tested changes can then be added to this page in one single edit. Please consider discussing any changes on the talk page before implementing them.

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This module is rated as beta, and is ready for widespread use. It is still new and should be used with some caution to ensure the results are as expected.

This is a meta-module that implements the message box templates {{mbox}}, {{ambox}}, {{cmbox}}, {{fmbox}}, {{imbox}}, {{ombox}}, and {{tmbox}}. It is intended to be used from Lua modules, and should not be used directly from wiki pages. If you want to use this module's functionality from a wiki page, please use the individual message box templates instead.

Usage

To use this module from another Lua module, first you need to load it.

local messageBox = require('Module:Message box')

To create a message box, use the main function. It takes two parameters: the first is the box type (as a string), and the second is a table containing the message box parameters.

local box = messageBox.main( boxType, {
    param1 = param1,
    param2 = param2,
    -- More parameters...
})

There are seven available box types:

Box type	Template	Purpose
`mbox`	{{mbox}}	For message boxes to be used in multiple namespaces
`ambox`	{{ambox}}	For article message boxes
`cmbox`	{{cmbox}}	For category message boxes
`fmbox`	{{fmbox}}	For interface message boxes
`imbox`	{{imbox}}	For file namespace message boxes
`tmbox`	{{tmbox}}	For talk page message boxes
`ombox`	{{ombox}}	For message boxes in other namespaces

See the template page of each box type for the available parameters.

Usage from #invoke

As well as the main function, this module has separate functions for each box type. They are accessed using the code {{#invoke:Message box|mbox|...}}, {{#invoke:Message box|ambox|...}}, etc. These will work when called from other modules, but they access code used to process arguments passed from #invoke, and so calling them will be less efficient than calling main.

Technical details

The module uses the same basic code for each of the templates listed above; the differences between each of them are configured using the data at Module:Message box/configuration. Here are the various configuration options and what they mean:

types - a table containing data used by the type parameter of the message box. The table keys are the values that can be passed to the type parameter, and the table values are tables containing the class and the image used by that type.
default - the type to use if no value was passed to the type parameter, or if an invalid value was specified.
showInvalidTypeError - whether to show an error if the value passed to the type parameter was invalid.
allowBlankParams - usually blank values are stripped from parameters passed to the module. However, whitespace is preserved for the parameters included in the allowBlankParams table.
allowId - whether it is possible to set an "id" attribute to the html table tag.
allowSmall - whether a small version of the message box can be produced with "small=yes".
smallParam - a custom name for the small parameter. For example, if set to "left" you can produce a small message box using "small=left".
smallClass - the class to use for small message boxes.
substCheck - whether to perform a subst check or not.
classes - an array of classes to use with the message box.
usePlainlinksParam - whether to allow "plainlinks=no" to turn off the plainlinks class.
imageEmptyCell - whether to use an empty <td>...</td> cell if there is no image set. This is used to preserve spacing for message boxes with a width of less than 100% of the screen.
imageEmptyCellStyle - whether empty image cells should be styled.
imageCheckBlank - whether "image=blank" results in no image being displayed.
imageSmallSize - usually, images used in small message boxes are set to 30x30px. This sets a custom size.
imageCellDiv - whether to enclose the image in a div enforcing a maximum image size.
useCollapsibleTextFields - whether to use text fields that can be collapsed, i.e. "issue", "fix", "talk", etc. Currently only used in ambox.
imageRightNone - whether imageright=none results in no image being displayed on the right-hand side of the message box.
sectionDefault - the default name for the "section" parameter. Depends on useCollapsibleTextFields.
allowMainspaceCategories - allow categorisation in the main namespace.
templateCategory - the name of a category to be placed on the template page.
templateCategoryRequireName - whether the name parameter is required to display the template category.
templateErrorCategory - the name of the error category to be used on the template page.
templateErrorParamsToCheck - an array of parameter names to check. If any are absent, the templateErrorCategory is applied to the template page.

-- This is a meta-module for producing message box templates, including {{mbox}}, {{ambox}}, {{imbox}}, {{tmbox}}, {{ombox}}, {{cmbox}} and {{fmbox}}.

-- Require necessary modules.
local getArgs = require('Module:Arguments').getArgs
local htmlBuilder = require('Module:HtmlBuilder')
local categoryHandler = require('Module:Category handler').main
local yesno = require('Module:Yesno')

-- Load the configuration page.
local cfgTables = mw.loadData('Module:Message box/configuration')

-- Get a language object for formatDate and ucfirst.
local lang = mw.language.getContentLanguage()

-- Set aliases for often-used functions to reduce table lookups.
local format = mw.ustring.format
local tinsert = table.insert
local tconcat = table.concat
local trim = mw.text.trim

--------------------------------------------------------------------------------
-- Helper functions
--------------------------------------------------------------------------------

local function getTitleObject(page, ...)
	if type(page) == 'string' then
		-- Get the title object, passing the function through pcall 
		-- in case we are over the expensive function count limit.
		local success, title = pcall(mw.title.new, page, ...)
		if success then
			return title
		end
	end
end

local function union(t1, t2)
	-- Returns the union of two arrays.
	local vals = {}
	for i, v in ipairs(t1) do
		vals[v] = true
	end
	for i, v in ipairs(t2) do
		vals[v] = true
	end
	local ret = {}
	for k in pairs(vals) do
		tinsert(ret, k)
	end
	table.sort(ret)
	return ret
end

local function getArgNums(args, prefix)
	local nums = {}
	for k, v in pairs(args) do
		local num = mw.ustring.match(tostring(k), '^' .. prefix .. '([1-9]%d*)$')
		if num then
			tinsert(nums, tonumber(num))
		end
	end
	table.sort(nums)
	return nums
end

--------------------------------------------------------------------------------
-- Box class definition
--------------------------------------------------------------------------------

local box = {}
box.__index = box

function box.new()
	local obj = {}
	setmetatable(obj, box)
	return obj
end

function box.getNamespaceId(ns)
	if not ns then return end
	if type(ns) == 'string' then
		ns = lang:ucfirst(mw.ustring.lower(ns))
		if ns == 'Main' then
			ns = 0
		end
	end
	local nsTable = mw.site.namespaces[ns]
	if nsTable then
		return nsTable.id
	end
end

function box.getMboxType(nsid)
	-- Gets the mbox type from a namespace number.
	if nsid == 0 then
		return 'ambox' -- main namespace
	elseif nsid == 6 then
		return 'imbox' -- file namespace
	elseif nsid == 14 then
		return 'cmbox' -- category namespace
	else
		local nsTable = mw.site.namespaces[nsid]
		if nsTable and nsTable.isTalk then
			return 'tmbox' -- any talk namespace
		else
			return 'ombox' -- other namespaces or invalid input
		end
	end
end

function box:addCat(ns, cat, sort)
	if type(cat) ~= 'string' then return end
	local nsVals = {'main', 'template', 'all'}
	local tname
	for i, val in ipairs(nsVals) do
		if ns == val then
			tname = ns .. 'Cats'
		end
	end
	if not tname then
		for i, val in ipairs(nsVals) do
			nsVals[i] = format('"%s"', val)
		end
		error('invalid ns parameter passed to box:addCat; valid values are ' .. mw.text.listToText(nsVals, nil, ' or '))
	end
	self[tname] = self[tname] or {}
	if type(sort) == 'string' then
		tinsert(self[tname], format('[[Category:%s|%s]]', cat, sort))
	else
		tinsert(self[tname], format('[[Category:%s]]', cat))
	end
end

function box:addClass(class)
	if type(class) ~= 'string' then return end
	self.classes = self.classes or {}
	tinsert(self.classes, class)
end

function box:setTitle(args)
	-- Get the title object and the namespace.
	self.pageTitle = getTitleObject(args.page ~= '' and args.page)
	self.title = self.pageTitle or mw.title.getCurrentTitle()
	self.demospace = args.demospace ~= '' and args.demospace or nil
	self.nsid = box.getNamespaceId(self.demospace) or self.title.namespace
end

function box:getConfig(boxType)
	-- Get the box config data from the data page.
	if boxType == 'mbox' then
		boxType = box.getMboxType(self.nsid)
	end
	local cfg = cfgTables[boxType]
	if not cfg then
		local boxTypes = {}
		for k, v in pairs(dataTables) do
			tinsert(boxTypes, format('"%s"', k))
		end
		tinsert(boxTypes, '"mbox"')
		error(format('invalid message box type "%s"; valid types are %s', tostring(boxType), mw.text.listToText(boxTypes)), 2)
	end
	return cfg
end

function box:removeBlankArgs(cfg, args)
	-- Only allow blank arguments for the parameter names listed in cfg.allowBlankParams.
	local newArgs = {}
	for k, v in pairs(args) do
		if v ~= '' then
			newArgs[k] = v
		end
	end
	for i, param in ipairs(cfg.allowBlankParams or {}) do
		newArgs[param] = args[param]
	end
	return newArgs
end

function box:setBoxParameters(cfg, args)
	-- Get type data.
	self.type = args.type
	local typeData = cfg.types[self.type]
	self.invalidTypeError = cfg.showInvalidTypeError and self.type and not typeData and true or false
	typeData = typeData or cfg.types[cfg.default]
	self.typeClass = typeData.class
	self.typeImage = typeData.image

	-- Find if the box has been wrongly substituted.
	if cfg.substCheck and args.subst == 'SUBST' then
		self.isSubstituted = true
	end

	-- Find whether we are using a small message box.
	if cfg.allowSmall and (
		cfg.smallParam and args.small == cfg.smallParam
		or not cfg.smallParam and yesno(args.small)
	)
	then
		self.isSmall = true
	else
		self.isSmall = false
	end

	-- Add attributes, classes and styles.
	if cfg.allowId then
		self.id = args.id
	end
	self:addClass(cfg.usePlainlinksParam and yesno(args.plainlinks or true) and 'plainlinks')
	for _, class in ipairs(cfg.classes or {}) do
		self:addClass(class)
	end
	if self.isSmall then
		self:addClass(cfg.smallClass or 'mbox-small')
	end
	if yesno(args.hidden) then
		self:addClass('infobox editsection')
	end
	self:addClass(self.typeClass)
	self:addClass(args.class)
	self.style = args.style

	-- Set text style.
	self.textstyle = args.textstyle

	-- Find if we are on the template page or not. This functionality is only used if useCollapsibleTextFields is set,
	-- or if both cfg.templateCategory and cfg.templateCategoryRequireName are set.
	self.useCollapsibleTextFields = cfg.useCollapsibleTextFields
	if self.useCollapsibleTextFields or cfg.templateCategory and cfg.templateCategoryRequireName then
		self.name = args.name
		if self.name then
			local templateName = mw.ustring.match(self.name, '^[tT][eE][mM][pP][lL][aA][tT][eE][%s_]*:[%s_]*(.*)$') or self.name
			templateName = 'Template:' .. templateName
			self.templateTitle = getTitleObject(templateName)
		end
		self.isTemplatePage = self.templateTitle and mw.title.equals(self.title, self.templateTitle) or false
	end

	-- Process data for collapsible text fields. At the moment these are only used in {{ambox}}.
	if self.useCollapsibleTextFields then
		-- Get the self.issue value.
		if self.isSmall and args.smalltext then
			self.issue = args.smalltext
		else
			local sect
			if args.sect == '' then
				sect = 'This ' .. (cfg.sectionDefault or 'page')
			elseif type(args.sect) == 'string' then
				sect = 'This ' .. args.sect
			end
			local issue = args.issue
			issue = type(issue) == 'string' and issue ~= '' and issue or nil
			local text = args.text
			text = type(text) == 'string' and text or nil
			local issues = {}
			tinsert(issues, sect)
			tinsert(issues, issue)
			tinsert(issues, text)
			self.issue = tconcat(issues, ' ')
		end

		-- Get the self.talk value.
		local talk = args.talk
		if talk == '' -- Show talk links on the template page or template subpages if the talk parameter is blank.
			and self.templateTitle 
			and (mw.title.equals(self.templateTitle, self.title) or self.title:isSubpageOf(self.templateTitle))
		then
			talk = '#'
		elseif talk == '' then
			talk = nil
		end
		if talk then
			-- If the talk value is a talk page, make a link to that page. Else assume that it's a section heading,
			-- and make a link to the talk page of the current page with that section heading.
			local talkTitle = getTitleObject(talk)
			local talkArgIsTalkPage = true
			if not talkTitle or not talkTitle.isTalkPage then
				talkArgIsTalkPage = false
				talkTitle = getTitleObject(self.title.text, mw.site.namespaces[self.title.namespace].talk.id)
			end
			if talkTitle and talkTitle.exists then
				local talkText = 'Relevant discussion may be found on'
				if talkArgIsTalkPage then
					talkText = format('%s [[%s|%s]].', talkText, talk, talkTitle.prefixedText)
				else
					talkText = format('%s the [[%s#%s|talk page]].', talkText, talkTitle.prefixedText, talk)
				end
				self.talk = talkText
			end
		end

		-- Get other values.
		self.fix = args.fix ~= '' and args.fix or nil
		local date
		if args.date and args.date ~= '' then
			date = args.date
		elseif args.date == '' and self.isTemplatePage then
			date = lang:formatDate('F Y')
		end
		if date then
			self.date = format(" <small>''(%s)''</small>", date)
		end
		self.info = args.info
	end

	-- Set the non-collapsible text field. At the moment this is used by all box types other than ambox,
	-- and also by ambox when small=yes.
	if self.isSmall then
		self.text = args.smalltext or args.text
	else
		self.text = args.text
	end

	-- Set the below row.
	self.below = cfg.below and args.below

	-- General image settings.
	self.imageCellDiv = not self.isSmall and cfg.imageCellDiv and true or false
	self.imageEmptyCell = cfg.imageEmptyCell
	if cfg.imageEmptyCellStyle then
		self.imageEmptyCellStyle = 'border:none;padding:0px;width:1px'
	end

	-- Left image settings.
	local imageLeft = self.isSmall and args.smallimage or args.image
	if cfg.imageCheckBlank and imageLeft ~= 'blank' and imageLeft ~= 'none'
		or not cfg.imageCheckBlank and imageLeft ~= 'none'
	then
		self.imageLeft = imageLeft
		if not imageLeft then
			local imageSize = self.isSmall and (cfg.imageSmallSize or '30x30px') or '40x40px'
			self.imageLeft = format('[[File:%s|%s|link=|alt=]]', self.typeImage or 'Imbox notice.png', imageSize)
		end
	end

	-- Right image settings.
	local imageRight = self.isSmall and args.smallimageright or args.imageright
	if not (cfg.imageRightNone and imageRight == 'none') then
		self.imageRight = imageRight
	end

	-- Add mainspace categories. At the moment these are only used in {{ambox}}.
	if cfg.allowMainspaceCategories then
		if args.cat then
			args.cat1 = args.cat
		end
		self.catNums = getArgNums(args, 'cat')
		if args.category then
			args.category1 = args.category
		end
		self.categoryNums = getArgNums(args, 'category')
		if args.all then
			args.all1 = args.all
		end
		self.allNums = getArgNums(args, 'all')
		self.categoryParamNums = union(self.catNums, self.categoryNums)
		self.categoryParamNums = union(self.categoryParamNums, self.allNums)
		-- The following is roughly equivalent to the old {{Ambox/category}}.
		local date = args.date
		date = type(date) == 'string' and date
		local preposition = 'from'
		for _, num in ipairs(self.categoryParamNums) do
			local mainCat = args['cat' .. tostring(num)] or args['category' .. tostring(num)]
			local allCat = args['all' .. tostring(num)]
			mainCat = type(mainCat) == 'string' and mainCat
			allCat = type(allCat) == 'string' and allCat
			if mainCat and date and date ~= '' then
				local catTitle = format('%s %s %s', mainCat, preposition, date)
				self:addCat('main', catTitle)
				catTitle = getTitleObject('Category:' .. catTitle)
				if not catTitle or not catTitle.exists then
					self:addCat('main', 'Articles with invalid date parameter in template')
				end
			elseif mainCat and (not date or date == '') then
				self:addCat('main', mainCat)
			end
			if allCat then
				self:addCat('main', allCat)
			end
		end
	end

	-- Add template-namespace categories.
	if cfg.templateCategory then
		if cfg.templateCategoryRequireName then
			if self.isTemplatePage then
				self:addCat('template', cfg.templateCategory)
			end
		elseif not self.title.isSubpage then
			self:addCat('template', cfg.templateCategory)
		end
	end

	-- Add template error category.
	if cfg.templateErrorCategory then
		local templateErrorCategory = cfg.templateErrorCategory
		local templateCat, templateSort
		if not self.name and not self.title.isSubpage then
			templateCat = templateErrorCategory
		elseif self.isTemplatePage then
			local paramsToCheck = cfg.templateErrorParamsToCheck or {}
			local count = 0
			for i, param in ipairs(paramsToCheck) do
				if not args[param] then
					count = count + 1
				end
			end
			if count > 0 then
				templateCat = templateErrorCategory
				templateSort = tostring(count)
			end
			if self.categoryNums and #self.categoryNums > 0 then
				templateCat = templateErrorCategory
				templateSort = 'C'
			end
		end
		self:addCat('template', templateCat, templateSort)
	end

	-- Categories for all namespaces.
	if self.invalidTypeError then
		local allSort = (self.nsid == 0 and 'Main:' or '') .. self.title.prefixedText
		self:addCat('all', 'Wikipedia message box parameter needs fixing', allSort)
	end
	if self.isSubstituted then
		self:addCat('all', 'Pages with incorrectly substituted templates')
	end

	-- Convert category tables to strings and pass them through [[Module:Category handler]].
	self.categories = categoryHandler{
		main = tconcat(self.mainCats or {}),
		template = tconcat(self.templateCats or {}),
		all = tconcat(self.allCats or {}),
		nocat = args.nocat,
		demospace = self.demospace,
		page = self.pageTitle and self.pageTitle.prefixedText or nil
	}
end

function box:export()
	local root = htmlBuilder.create()

	-- Add the subst check error.
	if self.isSubstituted and self.name then
		root
			.tag('b')
				.addClass('error')
				.wikitext(format(
					'Template <code>%s[[Template:%s|%s]]%s</code> has been incorrectly substituted.',
					mw.text.nowiki('{{'), self.name, self.name, mw.text.nowiki('}}')
				))
	end

	-- Create the box table.
	local boxTable = root.tag('table')
	boxTable
		.attr('id', self.id)
	for i, class in ipairs(self.classes or {}) do
		boxTable
			.addClass(class)
	end
	boxTable
		.cssText(self.style)
		.attr('role', 'presentation')

	-- Add the left-hand image.
	local row = boxTable.tag('tr')
	if self.imageLeft then
		local imageLeftCell = row.tag('td').addClass('mbox-image')
		if self.imageCellDiv then
			-- If we are using a div, redefine imageLeftCell so that the image is inside it.
			-- Divs use style="width: 52px;", which limits the image width to 52px. If any
			-- images in a div are wider than that, they may overlap with the text or cause
			-- other display problems.
			imageLeftCell = imageLeftCell.tag('div').css('width', '52px') 
		end
		imageLeftCell
			.wikitext(self.imageLeft)
	elseif self.imageEmptyCell then
		-- Some message boxes define an empty cell if no image is specified, and some don't.
		-- The old template code in templates where empty cells are specified gives the following hint:
		-- "No image. Cell with some width or padding necessary for text cell to have 100% width."
		row.tag('td')
			.addClass('mbox-empty-cell') 
			.cssText(self.imageEmptyCellStyle)
	end

	-- Add the text.
	local textCell = row.tag('td').addClass('mbox-text')
	if self.useCollapsibleTextFields then
		-- The message box uses advanced text parameters that allow things to be collapsible. At the
		-- moment, only ambox uses this.
		textCell
			.cssText(self.textstyle)
		local textCellSpan = textCell.tag('span')
		textCellSpan
			.addClass('mbox-text-span')
			.wikitext(self.issue)
		if not self.isSmall then
			textCellSpan
				.tag('span')
					.addClass('hide-when-compact')
					.wikitext(self.talk and ' ' .. self.talk)
					.wikitext(self.fix and ' ' .. self.fix)
		end
		textCellSpan
			.wikitext(self.date and ' ' .. self.date)
		if not self.isSmall then
			textCellSpan
				.tag('span')
				.addClass('hide-when-compact')
				.wikitext(self.info and ' ' .. self.info)
		end
	else
		-- Default text formatting - anything goes.
		textCell
			.cssText(self.textstyle)
			.wikitext(self.text)
	end

	-- Add the right-hand image.
	if self.imageRight then
		local imageRightCell = row.tag('td').addClass('mbox-imageright')
		if self.imageCellDiv then
			imageRightCell = imageRightCell.tag('div').css('width', '52px') -- If we are using a div, redefine imageRightCell so that the image is inside it.
		end
		imageRightCell
			.wikitext(self.imageRight)
	end

	-- Add the below row.
	if self.below then
		boxTable.tag('tr')
			.tag('td')
				.attr('colspan', self.imageRight and '3' or '2')
				.addClass('mbox-text')
				.cssText(self.textstyle)
				.wikitext(self.below)
	end

	-- Add error message for invalid type parameters.
	if self.invalidTypeError then
		root
			.tag('div')
				.css('text-align', 'center')
				.wikitext(format('This message box is using an invalid "type=%s" parameter and needs fixing.', self.type or ''))
	end

	-- Add categories.
	root
		.wikitext(self.categories)

	return tostring(root)
end

local function main(boxType, args)
	local outputBox = box.new()
	outputBox:setTitle(args)
	local cfg = outputBox:getConfig(boxType)
	args = outputBox:removeBlankArgs(cfg, args)
	outputBox:setBoxParameters(cfg, args)
	return outputBox:export()
end

local function makeWrapper(boxType)
	return function (frame)
		local args = getArgs(frame, {trim = false, removeBlanks = false})
		return main(boxType, args)
	end
end

local p = {
	main = main,
	mbox = makeWrapper('mbox')
}

for boxType in pairs(cfgTables) do
	p[boxType] = makeWrapper(boxType)
end

return p

Module:Message box

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