Module:Documentation: Difference between revisions

    From Nonbinary Wiki
    m>Mr. Stradivarius
    (don't use messages for args either - would be a pain for other modules that have to use this module)
    m>Mr. Stradivarius
    (hardcode "off" in "link box=off" as well, for the benefit of other modules/templates)
    Line 556: Line 556:
    -- First, check whether we should output the end box at all. Add the end box by default if the documentation
    -- First, check whether we should output the end box at all. Add the end box by default if the documentation
    -- exists or if we are in the user, module or template namespaces.
    -- exists or if we are in the user, module or template namespaces.
    if linkBox == message('linkBoxOff', 'string') or not (docExist or subjectSpace == 2 or subjectSpace == 828 or subjectSpace == 10) then
    if linkBox == 'off' or not (docExist or subjectSpace == 2 or subjectSpace == 828 or subjectSpace == 10) then
    return nil
    return nil
    end
    end

    Revision as of 00:11, 16 January 2014

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

    -- This module implements {{documentation}}.
    
    -- Get required modules.
    local getArgs = require('Module:Arguments').getArgs
    local htmlBuilder = require('Module:HtmlBuilder')
    local messageBox = require('Module:Message box')
    
    -- Get the config table.
    local cfg = mw.loadData('Module:Documentation/config')
    
    local p = {}
    
    -- Often-used functions.
    local gsub = mw.ustring.gsub
    
    ----------------------------------------------------------------------------
    -- Helper functions
    --
    -- These are defined as local functions, but are made available in the p
    -- table for testing purposes.
    ----------------------------------------------------------------------------
    
    local function message(cfgKey, expectType, valArray)
    	--[[
    	-- Gets a message from the cfg table and formats it if appropriate.
    	-- The function raises an error if the value from the cfg table is not
    	-- of the type expectType.
    	-- If the table valArray is present, strings such as $1, $2 etc. in the
    	-- message are substituted with values from the table keys [1], [2] etc.
    	-- For example, if the message cfg.fooMessage had the value 'Foo $2 bar $1.',
    	-- message('fooMessage', 'string', {'baz', 'qux'}) would return "Foo qux bar baz."
    	--]]
    	local msg = cfg[cfgKey]
    	if expectType and type(msg) ~= expectType then
    		error('message: type error in message cfg.' .. cfgKey .. ' (' .. expectType .. ' expected, got ' .. type(msg) .. ')', 2)
    	end
    	if not valArray then
    		return msg
    	end
    
    	local function getMessageVal(match)
    		match = tonumber(match)
    		return valArray[match] or error('message: no value found for key $' .. match .. ' in message cfg.' .. cfgKey, 4)
    	end
    
    	local ret = gsub(msg, '$([1-9][0-9]*)', getMessageVal)
    	return ret
    end
    
    p.message = message
    
    local function makeWikilink(page, display)
    	if display then
    		return mw.ustring.format('[[%s|%s]]', page, display)
    	else
    		return mw.ustring.format('[[%s]]', page)
    	end
    end
    
    p.makeWikilink = makeWikilink
    
    local function makeCategoryLink(cat, sort)
    	local catns = mw.site.namespaces[14].name
    	return makeWikilink(catns .. ':' .. cat, sort)
    end
    
    p.makeCategoryLink = makeCategoryLink
    
    local function makeUrlLink(url, display)
    	return mw.ustring.format('[%s %s]', url, display)
    end
    
    p.makeUrlLink = makeUrlLink
    
    local function makeToolbar(...)
    	local ret = {}
    	local lim = select('#', ...)
    	if lim < 1 then
    		return nil
    	end
    	for i = 1, lim do
    		ret[#ret + 1] = select(i, ...)
    	end
    	return '<small style="font-style: normal;">(' .. table.concat(ret, ' &#124; ') .. ')</small>'
    end	
    
    p.makeToolbar = makeToolbar
    
    local function err(msg)
    	return string.format(
    		'<strong class="error">%s %s</strong>%s',
    		message('errorPrefix', 'string'),
    		msg,
    		makeCategoryLink(message('errorCategory', 'string'))
    	)
    end
    
    p.err = err
    
    ----------------------------------------------------------------------------
    -- Argument processing
    ----------------------------------------------------------------------------
    
    local function makeInvokeFunc(funcName)
    	return function (frame)
    		local headingArg = message('headingArg', 'string')
    		local args = getArgs(frame, {
    			valueFunc = function (key, value)
    				if type(value) == 'string' then
    					value = value:match('^%s*(.-)%s*$') -- Remove whitespace.
    					if key == headingArg or value ~= '' then
    						return value
    					else
    						return nil
    					end
    				else
    					return value
    				end
    			end
    		})
    		return p[funcName](args)
    	end
    end
    
    ----------------------------------------------------------------------------
    -- Main function
    ----------------------------------------------------------------------------
    
    p.main = makeInvokeFunc('_main')
    
    function p._main(args)
    	local env = p.getEnvironment(args)
    	local root = htmlBuilder.create()
    	root
    		.wikitext(p.protectionTemplate(env))
    		.wikitext(p.sandboxNotice(args, env))
    		 -- This div tag is from {{documentation/start box}}, but moving it here
    		 -- so that we don't have to worry about unclosed tags.
    		.tag('div')
    			.attr('id', message('mainDivId', 'string'))
    			.addClass(message('mainDivClasses', 'string'))
    			.newline()
    			.wikitext(p._startBox(args, env))
    			.wikitext(p._content(args, env))
    			.tag('div')
    				.css('clear', 'both') -- So right or left floating items don't stick out of the doc box.
    				.newline()
    				.done()
    			.done()
    		.wikitext(p._endBox(args, env))
    		.newline()
    		.wikitext(p.addTrackingCategories(env))
    	return tostring(root)
    end
    
    ----------------------------------------------------------------------------
    -- Environment settings
    ----------------------------------------------------------------------------
    
    function p.getEnvironment(args)
    	-- Returns a table with information about the environment, including the title to use, the subject namespace, etc.
    	-- This is called from p._main using pcall in case we get any errors from exceeding the expensive function count
    	-- limit, or other perils unknown.
    	--
    	-- Data includes:
    	-- env.title - the title object of the page we are making documentation for (usually the current title)
    	-- env.subjectSpace - the number of the title's subject namespace.
    	-- env.docspace - the name of the namespace the title puts its documentation in.
    	-- env.templatePage - the name of the template page with no namespace or interwiki prefixes.
    	local env, envFuncs = {}, {}
    
    	-- Set up the metatable. If a nil value is called, we call that function in the envFuncs table and memoize it
    	-- in the env table so we don't have to call any of the functions more than once.
    	setmetatable(env, {
    		__index = function (t, key)
    			local envFunc = envFuncs[key]
    			if envFunc then
    				local val = envFunc()
    				env[key] = val
    				return val
    			else
    				return nil
    			end
    		end
    	})	
    
    	function envFuncs.title()
    		-- The title object for the current page, or a test page passed with args.page.
    		local title
    		local titleArg = args.page
    		if titleArg then
    			title = mw.title.new(titleArg)
    			if not title then
    				error(message('titleArgError', 'string', {titleArg}))
    			end
    		else
    			title = mw.title.getCurrentTitle()
    		end
    		return title
    	end
    
    	function envFuncs.subjectSpace()
    		-- The subject namespace number.
    		return mw.site.namespaces[env.title.namespace].subject.id
    	end
    
    	function envFuncs.docspace()
    		-- The name of the documentation namespace.
    		local subjectSpace = env.subjectSpace
    		if subjectSpace == 0 or subjectSpace == 6 or subjectSpace == 8 or subjectSpace == 14 then
    			-- Pages in the Article, File, MediaWiki or Category namespaces must have their
    			-- /doc, /sandbox and /testcases pages in talk space.
    			return mw.site.namespaces[subjectSpace].talk.name 
    		else
    			return env.title.subjectNsText
    		end
    	end
    
    	function envFuncs.templatePage()
    		-- The template page with no namespace or interwiki prefixes.
    		local title = env.title
    		local subpage = title.subpageText
    		if subpage == message('sandboxSubpage', 'string') or subpage == message('testcasesSubpage', 'string') then
    			return title.baseText
    		else
    			return title.text
    		end
    	end
    
    	function envFuncs.templateTitle()
    		-- The template (or module, etc.) title object.
    		local title = env.title
    		local subpage = title.subpageText
    		local ret
    		if subpage == message('sandboxSubpage', 'string') or subpage == message('testcasesSubpage', 'string') then
    			ret = title.basePageTitle
    		else
    			ret = title
    		end
    		if not ret then
    			error(message('titleArgError', 'string', {titleArg}))
    		end
    		return ret
    	end
    
    	function envFuncs.docTitle()
    		-- Title object of the /doc subpage.
    		local title = env.title
    		local docname = args[1] -- User-specified doc page.
    		local docpage
    		if docname then
    			docpage = docname
    		else
    			docpage = env.docpageRoot .. '/' .. message('docSubpage', 'string')
    		end
    		return mw.title.new(docpage)
    	end
    	
    	function envFuncs.docpageRoot()
    		-- The base page of the /doc, /sandbox, and /testcases subpages.
    		-- For some namespaces this is the talk page, rather than the template page.
    		local title = env.title
    		return (env.docspace or title.nsText) .. ':' .. (env.templatePage or title.text)
    	end
    	
    	function envFuncs.sandboxTitle()
    		-- Title object for the /sandbox subpage.
    		local titleArg = env.docpageRoot .. '/' .. message('sandboxSubpage', 'string')
    		local title = mw.title.new(titleArg)
    		if not title then
    			error(message('titleArgError', 'string', {titleArg}))
    		end
    		return title
    	end
    	
    	function envFuncs.testcasesTitle()
    		-- Title object for the /testcases subpage.
    		local titleArg = env.docpageRoot .. '/' .. message('testcasesSubpage', 'string')
    		local title = mw.title.new(titleArg)
    		if not title then
    			error(message('titleArgError', 'string', {titleArg}))
    		end
    		return title
    	end
    	
    	function envFuncs.printTitle()
    		-- Title object for the /Print subpage.
    		local titleArg = env.templatePage .. '/' .. message('printSubpage', 'string')
    		local title = mw.title.new(titleArg)
    		if not title then
    			error(message('titleArgError', 'string', {titleArg}))
    		end
    		return title
    	end
    	
    	function env:grab(key)
    		local success, val = pcall(function() return self[key] end)
    		return success, val
    	end
    
    	return env
    end	
    
    ----------------------------------------------------------------------------
    -- Auxiliary templates
    ----------------------------------------------------------------------------
    
    function p.sandboxNotice(args, env)
    	local sandboxNoticeTemplate = message('sandboxNoticeTemplate', 'string')
    	if not (sandboxNoticeTemplate and env.title.subpageText == message('sandboxSubpage', 'string')) then
    		return nil
    	end
    	local frame = mw.getCurrentFrame()
    	local notice = htmlBuilder.create()
    	notice
    		.tag('div')
    			.css('clear', 'both')
    			.done()
    		.wikitext(frame:expandTemplate{title = sandboxNoticeTemplate, args = {[message('sandboxNoticeLivepageParam')] = args.livepage}})
    	return tostring(notice)
    end
    
    function p.protectionTemplate(env)
    	local title = env.title
    	local protectionTemplate = message('protectionTemplate', 'string')
    	if not (protectionTemplate and title.namespace == 10) then
    		-- Don't display the protection template if we are not in the template namespace.
    		return nil
    	end
    	local frame = mw.getCurrentFrame()
    	local function getProtectionLevel(protectionType, page)
    		-- Gets the protection level for page, or for the current page if page is not specified.
    		local level = frame:callParserFunction('PROTECTIONLEVEL', protectionType, page)
    		if level ~= '' then
    			return level
    		else
    			return nil -- The parser function returns the blank string if there is no match.
    		end
    	end
    	local prefixedTitle = title.prefixedText
    	if getProtectionLevel('move', prefixedTitle) == 'sysop' or getProtectionLevel('edit', prefixedTitle) then
    		-- The page is full-move protected, or full, template, or semi-protected.
    		return frame:expandTemplate{title = protectionTemplate, args = message('protectionTemplateArgs', 'table')}
    	end
    	return nil
    end
    
    ----------------------------------------------------------------------------
    -- Start box
    ----------------------------------------------------------------------------
    
    p.startBox = makeInvokeFunc('_startBox')
    
    function p._startBox(args, env)
    	-- Generate [view][edit][history][purge] or [create] links.
    	local links
    	local content = args.content
    	if not content then
    		-- No need to include the links if the documentation is on the template page itself.
    		local linksData = p.makeStartBoxLinksData(args, env)
    		links = p.renderStartBoxLinks(linksData)
    	end
    	-- Generate the start box html.
    	local data = p.makeStartBoxData(args, env, links)
    	if type(data) == 'table' then
    		return p.renderStartBox(data)
    	elseif type(data) == 'string' then
    		-- data is an error message.
    		return data
    	else
    		-- User specified no heading.
    		return nil
    	end
    end
    
    function p.makeStartBoxLinksData(args, env)
    	local data = {}
    	-- Get title objects.
    	local titleSuccess, title = env:grab('title')
    	if titleSuccess then
    		data.title = title
    	else
    		return err(title)
    	end
    	local docTitleSuccess, docTitle = env:grab('docTitle')
    	if docTitleSuccess then
    		data.docTitle = docTitle
    	else
    		return err(docTitle)
    	end
    	-- View, display, edit, and purge links if /doc exists.
    	data.viewLinkDisplay = message('viewLinkDisplay', 'string')
    	data.editLinkDisplay = message('editLinkDisplay', 'string')
    	data.historyLinkDisplay = message('historyLinkDisplay', 'string')
    	data.purgeLinkDisplay = message('purgeLinkDisplay', 'string')
    	-- Create link if /doc doesn't exist.
    	local preload = args.preload
    	if not preload then
    		if env.subjectSpace == 6 then -- File namespace
    			preload = message('fileDocpagePreload', 'string')
    		else
    			preload = message('docpagePreload', 'string')
    		end
    	end
    	data.preload = preload
    	data.createLinkDisplay = message('createLinkDisplay', 'string')
    	return data
    end
    
    function p.renderStartBoxLinks(data)
    	-- Render the [view][edit][history][purge] or [create] links.
    	local ret
    	local docTitle = data.docTitle
    	local title = data.title
    	if docTitle.exists then
    		local viewLink = makeWikilink(docTitle.prefixedText, data.viewLinkDisplay)
    		local editLink = makeUrlLink(docTitle:fullUrl{action = 'edit'}, data.editLinkDisplay)
    		local historyLink = makeUrlLink(docTitle:fullUrl{action = 'history'}, data.historyLinkDisplay)
    		local purgeLink = makeUrlLink(title:fullUrl{action = 'purge'}, data.purgeLinkDisplay)
    		ret = '[%s] [%s] [%s] [%s]'
    		ret = ret:gsub('%[', '&#91;') -- Replace square brackets with HTML entities.
    		ret = ret:gsub('%]', '&#93;')
    		ret = mw.ustring.format(ret, viewLink, editLink, historyLink, purgeLink)
    	else
    		ret = makeUrlLink(docTitle:fullUrl{action = 'edit', preload = data.preload}, data.createLinkDisplay)
    	end
    end
    
    function p.makeStartBoxData(args, env, links)
    	local subjectSpace = env.subjectSpace
    	local data = {}
    	
    	-- Heading
    	local heading = args.heading -- Blank values are not removed.
    	if heading == '' then
    		-- Don't display the start box if the heading arg is defined but blank.
    		return nil
    	end
    	if heading then
    		data.heading = heading
    	elseif subjectSpace == 10 then -- Template namespace
    		data.heading = message('documentationIconWikitext', 'string') .. ' ' .. message('templateNamespaceHeading', 'string')
    	elseif subjectSpace == 828 then -- Module namespace
    		data.heading = message('documentationIconWikitext', 'string') .. ' ' .. message('moduleNamespaceHeading', 'string')
    	elseif subjectSpace == 6 then -- File namespace
    		data.heading = message('fileNamespaceHeading', 'string')
    	else
    		data.heading = message('otherNamespacesHeading', 'string')
    	end
    	
    	-- Heading CSS
    	local headingStyle = args['heading-style']
    	if headingStyle then
    		data.headingStyleText = headingStyle
    	elseif subjectSpace == 10 then
    		-- We are in the template or template talk namespaces.
    		data.headingFontWeight = 'bold'
    		data.headingFontSize = '125%'
    	else
    		data.headingFontSize = '150%'
    	end
    	
    	-- [view][edit][history][purge] or [create] links.
    	if links then
    		data.linksClass = message('startBoxLinkclasses', 'string')
    		data.linksId = message('startBoxLinkId', 'string')
    		data.links = links
    	end
    	
    	return data
    end
    
    function p.renderStartBox(data)
    	-- Renders the start box html.
    	local sbox = htmlBuilder.create('div')
    	sbox
    		.css('padding-bottom', '3px')
    		.css('border-bottom', '1px solid #aaa')
    		.css('margin-bottom', '1ex')
    		.newline()
    		.tag('span')
    			.cssText(data.headingStyleText)
    			.css('font-weight', data.headingFontWeight)
    			.css('font-size', data.headingFontSize)
    			.wikitext(data.heading)
    	local links = data.links
    	if links then
    		sbox.tag('span')
    			.addClass(data.linksClass)
    			.attr('id', data.linksId)
    			.wikitext(links)
    	end
    	return tostring(sbox)
    end
    
    ----------------------------------------------------------------------------
    -- Documentation content
    ----------------------------------------------------------------------------
    
    p.content = makeInvokeFunc('_content')
    
    function p._content(args, env)
    	local content = args.content
    	if not content then
    		local docpage = args[1]
    		if docpage and mw.title.new(docpage).exists then
    			local frame = mw.getCurrentFrame()
    			content = frame:preprocess('{{ ' .. docpage .. ' }}')
    		else
    			docpage = env.docspace .. ':' .. env.templatePage .. '/' .. message('docSubpage', 'string')
    			if mw.title.new(docpage).exists then
    				local frame = mw.getCurrentFrame()
    				content = frame:preprocess('{{ ' .. docpage .. ' }}')
    			end
    		end
    	end
    	-- The line breaks below are necessary so that "=== Headings ===" at the start and end
    	-- of docs are interpreted correctly.
    	return '\n' .. (content or '') .. '\n' 
    end
    
    ----------------------------------------------------------------------------
    -- End box
    ----------------------------------------------------------------------------
    
    p.endBox = makeInvokeFunc('_endBox')
    
    function p._endBox(args, env)
    	local title = env.title
    	local subjectSpace = env.subjectSpace
    
    	-- Argument processing in {{documentation}}.
    	local content = args.content
    	local linkBox = args['link box'] -- So "link box=off" works.
    	local docspace = env.docspace
    	local docname = args[1] -- Other docname, if fed.
    	local templatePage = env.templatePage
    
    	-- Argument processing in {{documentation/end box2}}.
    	local docpageRoot = (docspace or title.nsText) .. ':' .. (templatePage or title.text)
    	local docpage
    	if docname then
    		docpage = docname
    	else
    		docpage = docpageRoot .. '/' .. message('docSubpage', 'string')
    	end
    	local docTitle = mw.title.new(docpage)
    	local docExist = docTitle.exists
    	local docnameFed = args[1] and true
    	local sandbox = docpageRoot .. '/' .. message('sandboxSubpage', 'string')
    	local testcases = docpageRoot .. '/' .. message('testcasesSubpage', 'string')
    	templatePage = title.nsText .. ':' .. templatePage
    
    	-- Output from {{documentation/end box}}
    	
    	-- First, check whether we should output the end box at all. Add the end box by default if the documentation
    	-- exists or if we are in the user, module or template namespaces.
    	if linkBox == 'off' or not (docExist or subjectSpace == 2 or subjectSpace == 828 or subjectSpace == 10) then
    		return nil
    	end
    
    	-- Assemble the arguments for {{fmbox}}.
    	local fmargs = {}
    	fmargs.id = message('fmboxId', 'string') -- Sets 'documentation-meta-data'
    	fmargs.image = message('fmboxImageNone', 'string') -- Sets 'none'
    	fmargs.style = message('fmboxStyle', 'string') -- Sets 'background-color: #ecfcf4'
    	fmargs.textstyle = message('fmboxTextstyle', 'string') -- 'font-style: italic;'
    
    	-- Assemble the fmbox text field.
    	local text = ''
    	if linkBox then
    		-- Use custom link box content if it is defined.
    		text = text .. linkBox
    	else
    		text = text .. (p.makeDocPageBlurb(args, env) or '')
    		-- Add links to /sandbox and /testcases when appropriate.
    		if subjectSpace == 2 or subjectSpace == 828 or subjectSpace == 10 then
    			-- We are in the user, module or template namespaces. 
    			text = text .. p.makeEndBoxExperimentBlurb(args, env)
    			text = text .. '<br />'
    			-- Show the categories text, but not if "content" fed or "docname fed" since then it is unclear where to add the categories.
    			if not content and not docnameFed then
    				local docPathLink = makeWikilink(docpage, message('docLinkDisplay', 'string'))
    				text = text .. message('addCategoriesBlurb', 'string', {docPathLink})
    			end
    			-- Show the "subpages" link.
    			if subjectSpace ~= 6 then -- Don't show the link in file space.
    				local pagetype
    				if subjectSpace == 10 then
    					pagetype = message('templatePagetype', 'string')
    				elseif subjectSpace == 828 then
    					pagetype = message('modulePagetype', 'string')
    				else
    					pagetype = message('defaultPagetype', 'string')
    				end
    				text = text .. ' ' .. makeWikilink('Special:PrefixIndex/' .. templatePage .. '/', message('subpagesLinkDisplay', 'string', {pagetype}))
    			end
    			-- Show the "print" link if it exists.
    			local printPage = templatePage .. '/' .. message('printSubpage', 'string')
    			local printTitle = mw.title.new(printPage)
    			if printTitle.exists then
    				local printLink = makeWikilink(printPage, message('printLinkDisplay', 'string'))
    				text = text .. '<br />' .. message('printBlurb', 'string', {printLink})
    					.. (message('displayPrintCategory', 'boolean') and makeCategoryLink(message('printCategory', 'string')) or '')
    			end
    		end
    	end
    	fmargs.text = text
    
    	-- Return the fmbox output.
    	return messageBox.main('fmbox', fmargs)
    end
    
    function p.makeCategoriesBlurb(args, env)
    	-- Get the title object.
    	local success, docTitle = env:grab('docTitle')
    	if not success then
    		-- docTitle is the error message.
    		return docTitle
    	end
    	-- Make the blurb.
    	local docPathLink = makeWikilink(docTitle.prefixedText, message('docLinkDisplay', 'string'))
    	return message('addCategoriesBlurb', 'string', {docPathLink})
    end
    
    function p.makeDocPageBlurb(args, env)
    	-- Get the title object.
    	local success, docTitle = env:grab('docTitle')
    	if not success then
    		-- docTitle is the error message.
    		return docTitle
    	end
    	-- Make the blurb.
    	local ret
    	if docTitle.exists then
    		-- /doc exists; link to it.
    		local docLink = makeWikilink(docTitle.prefixedText)
    		local editUrl = docTitle:fullUrl{action = 'edit'}
    		local editDisplay = message('editLinkDisplay', 'string')
    		local editLink = makeUrlLink(editUrl, editDisplay)
    		local historyUrl = docTitle:fullUrl{action = 'history'}
    		local historyDisplay = message('historyLinkDisplay', 'string')
    		local historyLink = makeUrlLink(historyUrl, historyDisplay)
    		ret = message('transcludedFromBlurb', 'string', {docLink})
    			.. ' '
    			.. makeToolbar(editLink, historyLink)
    			.. '<br />'
    	elseif env.subjectSpace == 828 then
    		-- /doc does not exist; ask to create it.
    		local createUrl = docTitle:fullUrl{action = 'edit', preload = message('modulePreload', 'string')}
    		local createDisplay = message('createLinkDisplay', 'string')
    		local createLink = makeUrlLink(createUrl, createDisplay)
    		ret = message('createModuleDocBlurb', 'string', {createLink})
    			.. '<br />'
    	end
    	return ret
    end
    
    function p.makeEndBoxExperimentBlurb(args, env)
    	-- Renders the text "Editors can experiment in this template's sandbox (edit | diff) and testcases (edit) pages."
    	local subjectSpace = env.subjectSpace
    	local templatePage = env.templatePage
    	-- Get title objects.
    	local templateSuccess, templateTitle = env:grab('templateTitle')
    	if not templateSuccess then
    		return err(templateTitle)
    	end
    	local sandboxSuccess, sandboxTitle = env:grab('sandboxTitle')
    	if not sandboxSuccess then
    		return err(sandboxTitle)
    	end
    	local testcasesSuccess, testcasesTitle = env:grab('testcasesTitle')
    	if not testcasesSuccess then
    		return err(testcasesTitle)
    	end
    	-- Make links.
    	local sandboxLinks, testcasesLinks
    	if sandboxTitle.exists then
    		local sandboxPage = sandboxTitle.prefixedText
    		local sandboxDisplay = message('sandboxLinkDisplay', 'string')
    		local sandboxLink = makeWikilink(sandboxPage, sandboxDisplay)
    		local sandboxEditUrl = sandboxTitle:fullUrl{action = 'edit'}
    		local sandboxEditDisplay = message('sandboxEditLinkDisplay', 'string')
    		local sandboxEditLink = makeUrlLink(sandboxEditUrl, sandboxEditDisplay)
    		local compareUrl = mw.uri.fullUrl('Special:ComparePages', {page1 = templateTitle.prefixedText, page2 = sandboxPage})
    		compareUrl = tostring(compareUrl)
    		local compareDisplay = message('compareLinkDisplay', 'string')
    		local compareLink = makeUrlLink(compareUrl, compareDisplay)
    		sandboxLinks = sandboxLink .. ' ' .. makeToolbar(sandboxEditLink, compareLink)
    	else
    		local sandboxPreload
    		if subjectSpace == 828 then
    			sandboxPreload = message('moduleSandboxPreload', 'string')
    		else
    			sandboxPreload = message('templateSandboxPreload', 'string')
    		end
    		local sandboxCreateUrl = sandboxTitle:fullUrl{action = 'edit', preload = sandboxPreload}
    		local sandboxCreateDisplay = message('sandboxCreateLinkDisplay', 'string')
    		local sandboxCreateLink = makeUrlLink(sandboxCreateUrl, sandboxCreateDisplay)
    		local mirrorSummary = message('mirrorEditSummary', 'string', {makeWikilink(templatePage)})
    		local mirrorUrl = sandboxTitle:fullUrl{action = 'edit', preload = templatePage, summary = mirrorSummary}
    		local mirrorDisplay = message('mirrorLinkDisplay', 'string')
    		local mirrorLink = makeUrlLink(mirrorUrl, mirrorDisplay)
    		sandboxLinks = message('sandboxLinkDisplay', 'string') .. ' ' .. makeToolbar(sandboxCreateLink, mirrorLink)
    	end
    	if testcasesTitle.exists then
    		local testcasesPage = testcasesTitle.prefixedText
    		local testcasesDisplay = message('testcasesLinkDisplay', 'string')
    		local testcasesLink = makeWikilink(testcasesPage, testcasesDisplay)
    		local testcasesEditUrl = testcasesTitle:fullUrl{action = 'edit'}
    		local testcasesEditDisplay = message('testcasesEditLinkDisplay', 'string')
    		local testcasesEditLink = makeUrlLink(testcasesEditUrl, testcasesEditDisplay)
    		testcasesLinks = testcasesLink .. ' ' .. makeToolbar(testcasesEditLink)
    	else
    		local testcasesPreload
    		if subjectSpace == 828 then
    			testcasesPreload = message('moduleTestcasesPreload', 'string')
    		else
    			testcasesPreload = message('templateTestcasesPreload', 'string')
    		end
    		local testcasesCreateUrl = testcasesTitle:fullUrl{action = 'edit', preload = testcasesPreload}
    		local testcasesCreateDisplay = message('testcasesCreateLinkDisplay', 'string')
    		local testcasesCreateLink = makeUrlLink(testcasesCreateUrl, testcasesCreateDisplay)
    		testcasesLinks = message('testcasesLinkDisplay', 'string') .. ' ' .. makeToolbar(testcasesCreateLink)
    	end
    	local messageName
    	if subjectSpace == 828 then
    		messageName = 'experimentBlurbModule'
    	else
    		messageName = 'experimentBlurbTemplate'
    	end
    	return message(messageName, 'string', {sandboxLinks, testcasesLinks})
    end
    
    ----------------------------------------------------------------------------
    -- Tracking categories
    ----------------------------------------------------------------------------
    
    function p.addTrackingCategories(env)
    	-- Check if {{documentation}} is transcluded on a /doc or /testcases page.
    	local title = env.title
    	local ret = ''
    	local subpage = title.subpageText
    	if message('displayStrangeUsageCategory', 'boolean') and (subpage == message('docSubpage', 'string') or subpage == message('testcasesSubpage', 'string')) then
    		local sort = (title.namespace == 0 and message('strangeUsageCategoryMainspaceSort', 'string') or '') .. title.prefixedText -- Sort on namespace.
    		ret = ret .. makeCategoryLink(message('strangeUsageCategory', 'string'), sort)
    	end
    	return ret
    end
    
    return p