Module:Documentation: Difference between revisions

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    m>Mr. Stradivarius
    (found it - fix misspelled message name)
    m (1 revision imported from wikipedia:Module:Documentation: see Topic:Vtixlm0q28eo6jtf)
     
    (142 intermediate revisions by 37 users not shown)
    Line 3: Line 3:
    -- Get required modules.
    -- Get required modules.
    local getArgs = require('Module:Arguments').getArgs
    local getArgs = require('Module:Arguments').getArgs
    local htmlBuilder = require('Module:HtmlBuilder')
    local messageBox = require('Module:Message box')


    -- Get the config table.
    -- Get the config table.
    Line 10: Line 8:


    local p = {}
    local p = {}
    -- Constants.
    local currentTitle = mw.title.getCurrentTitle()
    local subjectSpace = mw.site.namespaces[currentTitle.namespace].subject.id -- The number of the current subject namespace.


    -- Often-used functions.
    -- Often-used functions.
    local gsub = mw.ustring.gsub
    local ugsub = mw.ustring.gsub


    ----------------------------------------------------------------------------
    ----------------------------------------------------------------------------
    -- Helper functions
    -- Helper functions
    --
    -- These are defined as local functions, but are made available in the p
    -- table for testing purposes.
    ----------------------------------------------------------------------------
    ----------------------------------------------------------------------------


    local function formatMessage(cfgKey, expectType, valArray)
    local function message(cfgKey, valArray, expectType)
    --[[
    --[[
    -- Formats a message from the cfg table.
    -- 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.
    -- The function raises an error if the value from the cfg table is not
    -- Values from valArray can be specified in the message by using $1 for [1], $2 for [2], etc.
    -- of the type expectType. The default type for expectType is 'string'.
    -- For example, if the message cfg.fooMessage had the value 'Foo $2 bar $1.',
    -- If the table valArray is present, strings such as $1, $2 etc. in the
    -- formatMessage('fooMessage', 'string', {'baz', 'qux'}) would return "Foo qux bar baz."
    -- message are substituted with values from the table keys [1], [2] etc.
    -- For example, if the message "foo-message" had the value 'Foo $2 bar $1.',
    -- message('foo-message', {'baz', 'qux'}) would return "Foo qux bar baz."
    --]]
    --]]
    local msg = cfg[cfgKey]
    local msg = cfg[cfgKey]
    if expectType and type(msg) ~= expectType then
    expectType = expectType or 'string'
    error('formatMessage: type error in message cfg.' .. cfgKey .. ' (' .. expectType .. ' expected, got ' .. type(msg) .. ')', 2)
    if type(msg) ~= expectType then
    error('message: type error in message cfg.' .. cfgKey .. ' (' .. expectType .. ' expected, got ' .. type(msg) .. ')', 2)
    end
    end
    if not valArray then
    if not valArray then
    Line 40: Line 40:
    local function getMessageVal(match)
    local function getMessageVal(match)
    match = tonumber(match)
    match = tonumber(match)
    return valArray[match] or error('formatMessage: no value found for key $' .. match .. ' in message cfg.' .. cfgKey, 4)
    return valArray[match] or error('message: no value found for key $' .. match .. ' in message cfg.' .. cfgKey, 4)
    end
    end


    local ret = gsub(msg, '$([1-9][0-9]*)', getMessageVal)
    return ugsub(msg, '$([1-9][0-9]*)', getMessageVal)
    return ret
    end
    end
    p.message = message


    local function makeWikilink(page, display)
    local function makeWikilink(page, display)
    Line 54: Line 55:
    end
    end
    end
    end
    p.makeWikilink = makeWikilink


    local function makeCategoryLink(cat, sort)
    local function makeCategoryLink(cat, sort)
    local catns = mw.site.namespaces[14].name
    local catns = mw.site.namespaces[14].name
    return makeWikilink(catns .. '/' .. cat, sort)
    return makeWikilink(catns .. ':' .. cat, sort)
    end
    end
    p.makeCategoryLink = makeCategoryLink


    local function makeUrlLink(url, display)
    local function makeUrlLink(url, display)
    return mw.ustring.format('[%s %s]', url, display)
    return mw.ustring.format('[%s %s]', url, display)
    end
    end
    p.makeUrlLink = makeUrlLink


    local function makeToolbar(...)
    local function makeToolbar(...)
    Line 73: Line 80:
    ret[#ret + 1] = select(i, ...)
    ret[#ret + 1] = select(i, ...)
    end
    end
    return '<small style="font-style: normal;">(' .. table.concat(ret, ' &#124; ') .. ')</small>'
    -- 'documentation-toolbar'
    return '<span class="' .. message('toolbar-class') .. '">('
    .. table.concat(ret, ' &#124; ') .. ')</span>'
    end
    end
    p.makeToolbar = makeToolbar


    ----------------------------------------------------------------------------
    ----------------------------------------------------------------------------
    Line 82: Line 93:
    local function makeInvokeFunc(funcName)
    local function makeInvokeFunc(funcName)
    return function (frame)
    return function (frame)
    local headingArg = formatMessage('headingArg', 'string')
    local args = getArgs(frame, {
    local args = getArgs(frame, {
    valueFunc = function (key, value)
    valueFunc = function (key, value)
    if type(value) == 'string' then
    if type(value) == 'string' then
    value = value:match('^%s*(.-)%s*$') -- Remove whitespace.
    value = value:match('^%s*(.-)%s*$') -- Remove whitespace.
    if key == headingArg or value ~= '' then
    if key == 'heading' or value ~= '' then
    return value
    return value
    else
    else
    Line 102: Line 112:


    ----------------------------------------------------------------------------
    ----------------------------------------------------------------------------
    -- Main functions
    -- Entry points
    ----------------------------------------------------------------------------
    ----------------------------------------------------------------------------
    function p.nonexistent(frame)
    if mw.title.getCurrentTitle().subpageText == 'testcases' then
    return frame:expandTemplate{title = 'module test cases notice'}
    else
    return p.main(frame)
    end
    end


    p.main = makeInvokeFunc('_main')
    p.main = makeInvokeFunc('_main')


    function p._main(args)
    function p._main(args)
    local root = htmlBuilder.create()
    --[[
    -- This function defines logic flow for the module.
    -- @args - table of arguments passed by the user
    --]]
    local env = p.getEnvironment(args)
    local root = mw.html.create()
    root
    root
    .wikitext(p.protectionTemplate())
    :wikitext(p._getModuleWikitext(args, env))
    .wikitext(p.sandboxNotice(args))
    :wikitext(p.protectionTemplate(env))
    -- This div tag is from {{documentation/start box}}, but moving it here
    :wikitext(p.sandboxNotice(args, env))
    -- so that we don't have to worry about unclosed tags.
    :tag('div')
    .tag('div')
    -- 'documentation-container'
    .attr('id', formatMessage('mainDivId', 'string'))
    :addClass(message('container'))
    .addClass(formatMessage('mainDivClasses', 'string'))
    :newline()
    .newline()
    :tag('div')
    .wikitext(p._startBox(args))
    -- 'documentation'
    .wikitext(p._content(args))
    :addClass(message('main-div-classes'))
    .tag('div')
    :newline()
    .css('clear', 'both') -- So right or left floating items don't stick out of the doc box.
    :wikitext(p._startBox(args, env))
    .newline()
    :wikitext(p._content(args, env))
    .done()
    :tag('div')
    .done()
    -- 'documentation-clear'
    .wikitext(p._endBox(args))
    :addClass(message('clear'))
    .newline()
    :done()
    .wikitext(p.addTrackingCategories())
    :newline()
    return tostring(root)
    :done()
    :wikitext(p._endBox(args, env))
    :done()
    :wikitext(p.addTrackingCategories(env))
    -- 'Module:Documentation/styles.css'
    return mw.getCurrentFrame():extensionTag (
    'templatestyles', '', {src=cfg['templatestyles']
    }) .. tostring(root)
    end
    end


    function p.sandboxNotice(args)
    ----------------------------------------------------------------------------
    local sandboxNoticeTemplate = formatMessage('sandboxNoticeTemplate', 'string')
    -- Environment settings
    if not (sandboxNoticeTemplate and currentTitle.subpageText == formatMessage('sandboxSubpage', 'string')) then
    ----------------------------------------------------------------------------
    return nil
     
    function p.getEnvironment(args)
    --[[
    -- Returns a table with information about the environment, including title
    -- objects and other namespace- or path-related data.
    -- @args - table of arguments passed by the user
    --
    -- Title objects include:
    -- env.title - the page we are making documentation for (usually the current title)
    -- env.templateTitle - the template (or module, file, etc.)
    -- env.docTitle - the /doc subpage.
    -- env.sandboxTitle - the /sandbox subpage.
    -- env.testcasesTitle - the /testcases subpage.
    -- env.printTitle - the print version of the template, located at the /Print subpage.
    --
    -- Data includes:
    -- env.protectionLevels - the protection levels table of the title object.
    -- env.subjectSpace - the number of the title's subject namespace.
    -- env.docSpace - the number of the namespace the title puts its documentation in.
    -- env.docpageBase - the text of the base page of the /doc, /sandbox and /testcases pages, with namespace.
    -- env.compareUrl - URL of the Special:ComparePages page comparing the sandbox with the template.
    --
    -- All table lookups are passed through pcall so that errors are caught. If an error occurs, the value
    -- returned will be nil.
    --]]
    local env, envFuncs = {}, {}
     
    -- Set up the metatable. If triggered we call the corresponding function in the envFuncs table. The value
    -- returned by that function is memoized in the env table so that we don't call any of the functions
    -- more than once. (Nils won't be memoized.)
    setmetatable(env, {
    __index = function (t, key)
    local envFunc = envFuncs[key]
    if envFunc then
    local success, val = pcall(envFunc)
    if success then
    env[key] = val -- Memoise the value.
    return val
    end
    end
    return nil
    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)
    else
    title = mw.title.getCurrentTitle()
    end
    return title
    end
     
    function envFuncs.templateTitle()
    --[[
    -- The template (or module, etc.) title object.
    -- Messages:
    -- 'sandbox-subpage' --> 'sandbox'
    -- 'testcases-subpage' --> 'testcases'
    --]]
    local subjectSpace = env.subjectSpace
    local title = env.title
    local subpage = title.subpageText
    if subpage == message('sandbox-subpage') or subpage == message('testcases-subpage') then
    return mw.title.makeTitle(subjectSpace, title.baseText)
    else
    return mw.title.makeTitle(subjectSpace, title.text)
    end
    end
     
    function envFuncs.docTitle()
    --[[
    -- Title object of the /doc subpage.
    -- Messages:
    -- 'doc-subpage' --> 'doc'
    --]]
    local title = env.title
    local docname = args[1] -- User-specified doc page.
    local docpage
    if docname then
    docpage = docname
    else
    docpage = env.docpageBase .. '/' .. message('doc-subpage')
    end
    return mw.title.new(docpage)
    end
    function envFuncs.sandboxTitle()
    --[[
    -- Title object for the /sandbox subpage.
    -- Messages:
    -- 'sandbox-subpage' --> 'sandbox'
    --]]
    return mw.title.new(env.docpageBase .. '/' .. message('sandbox-subpage'))
    end
    function envFuncs.testcasesTitle()
    --[[
    -- Title object for the /testcases subpage.
    -- Messages:
    -- 'testcases-subpage' --> 'testcases'
    --]]
    return mw.title.new(env.docpageBase .. '/' .. message('testcases-subpage'))
    end
    function envFuncs.printTitle()
    --[[
    -- Title object for the /Print subpage.
    -- Messages:
    -- 'print-subpage' --> 'Print'
    --]]
    return env.templateTitle:subPageTitle(message('print-subpage'))
    end
     
    function envFuncs.protectionLevels()
    -- The protection levels table of the title object.
    return env.title.protectionLevels
    end
     
    function envFuncs.subjectSpace()
    -- The subject namespace number.
    return mw.site.namespaces[env.title.namespace].subject.id
    end
     
    function envFuncs.docSpace()
    -- The documentation namespace number. For most namespaces this is the
    -- same as the subject namespace. However, pages in the Article, File,
    -- MediaWiki or Category namespaces must have their /doc, /sandbox and
    -- /testcases pages in talk space.
    local subjectSpace = env.subjectSpace
    if subjectSpace == 0 or subjectSpace == 6 or subjectSpace == 8 or subjectSpace == 14 then
    return subjectSpace + 1
    else
    return subjectSpace
    end
    end
     
    function envFuncs.docpageBase()
    -- The base page of the /doc, /sandbox, and /testcases subpages.
    -- For some namespaces this is the talk page, rather than the template page.
    local templateTitle = env.templateTitle
    local docSpace = env.docSpace
    local docSpaceText = mw.site.namespaces[docSpace].name
    -- Assemble the link. docSpace is never the main namespace, so we can hardcode the colon.
    return docSpaceText .. ':' .. templateTitle.text
    end
    function envFuncs.compareUrl()
    -- Diff link between the sandbox and the main template using [[Special:ComparePages]].
    local templateTitle = env.templateTitle
    local sandboxTitle = env.sandboxTitle
    if templateTitle.exists and sandboxTitle.exists then
    local compareUrl = mw.uri.fullUrl(
    'Special:ComparePages',
    { page1 = templateTitle.prefixedText, page2 = sandboxTitle.prefixedText}
    )
    return tostring(compareUrl)
    else
    return nil
    end
    end
     
    return env
    end
     
    ----------------------------------------------------------------------------
    -- Auxiliary templates
    ----------------------------------------------------------------------------
     
    p.getModuleWikitext = makeInvokeFunc('_getModuleWikitext')
     
    function p._getModuleWikitext(args, env)
    local currentTitle = mw.title.getCurrentTitle()
    if currentTitle.contentModel ~= 'Scribunto' then return end
    pcall(require, currentTitle.prefixedText) -- if it fails, we don't care
    local moduleWikitext =  package.loaded["Module:Module wikitext"]
    if moduleWikitext then
    return moduleWikitext.main()
    end
    end
    local frame = mw.getCurrentFrame()
    local notice = htmlBuilder.create()
    notice
    .tag('div')
    .css('clear', 'both')
    .done()
    .wikitext(frame:expandTemplate{title = sandboxNoticeTemplate, args = {[formatMessage('sandboxNoticeLivepageParam')] = args[formatMessage('livepageArg', 'string')]}})
    return tostring(notice)
    end
    end


    function p.protectionTemplate()
    function p.sandboxNotice(args, env)
    local protectionTemplate = formatMessage('protectionTemplate', 'string')
    --[=[
    if not (protectionTemplate and currentTitle.namespace == 10) then
    -- Generates a sandbox notice for display above sandbox pages.
    -- Don't display the protection template if we are not in the template namespace.
    -- @args - a table of arguments passed by the user
    -- @env - environment table containing title objects, etc., generated with p.getEnvironment
    --
    -- Messages:
    -- 'sandbox-notice-image' --> '[[Image:Sandbox.svg|50px|alt=|link=]]'
    -- 'sandbox-notice-blurb' --> 'This is the $1 for $2.'
    -- 'sandbox-notice-diff-blurb' --> 'This is the $1 for $2 ($3).'
    -- 'sandbox-notice-pagetype-template' --> '[[Wikipedia:Template test cases|template sandbox]] page'
    -- 'sandbox-notice-pagetype-module' --> '[[Wikipedia:Template test cases|module sandbox]] page'
    -- 'sandbox-notice-pagetype-other' --> 'sandbox page'
    -- 'sandbox-notice-compare-link-display' --> 'diff'
    -- 'sandbox-notice-testcases-blurb' --> 'See also the companion subpage for $1.'
    -- 'sandbox-notice-testcases-link-display' --> 'test cases'
    -- 'sandbox-category' --> 'Template sandboxes'
    --]=]
    local title = env.title
    local sandboxTitle = env.sandboxTitle
    local templateTitle = env.templateTitle
    local subjectSpace = env.subjectSpace
    if not (subjectSpace and title and sandboxTitle and templateTitle
    and mw.title.equals(title, sandboxTitle)) then
    return nil
    return nil
    end
    end
    local frame = mw.getCurrentFrame()
    -- Build the table of arguments to pass to {{ombox}}. We need just two fields, "image" and "text".
    local function getProtectionLevel(protectionType)
    local omargs = {}
    -- Gets the protection level for the current page.
    omargs.image = message('sandbox-notice-image')
    local level = frame:callParserFunction('PROTECTIONLEVEL', protectionType)
    -- Get the text. We start with the opening blurb, which is something like
    if level ~= '' then
    -- "This is the template sandbox for [[Template:Foo]] (diff)."
    return level
    local text = ''
    local pagetype
    if subjectSpace == 10 then
    pagetype = message('sandbox-notice-pagetype-template')
    elseif subjectSpace == 828 then
    pagetype = message('sandbox-notice-pagetype-module')
    else
    pagetype = message('sandbox-notice-pagetype-other')
    end
    local templateLink = makeWikilink(templateTitle.prefixedText)
    local compareUrl = env.compareUrl
    if compareUrl then
    local compareDisplay = message('sandbox-notice-compare-link-display')
    local compareLink = makeUrlLink(compareUrl, compareDisplay)
    text = text .. message('sandbox-notice-diff-blurb', {pagetype, templateLink, compareLink})
    else
    text = text .. message('sandbox-notice-blurb', {pagetype, templateLink})
    end
    -- Get the test cases page blurb if the page exists. This is something like
    -- "See also the companion subpage for [[Template:Foo/testcases|test cases]]."
    local testcasesTitle = env.testcasesTitle
    if testcasesTitle and testcasesTitle.exists then
    if testcasesTitle.contentModel == "Scribunto" then
    local testcasesLinkDisplay = message('sandbox-notice-testcases-link-display')
    local testcasesRunLinkDisplay = message('sandbox-notice-testcases-run-link-display')
    local testcasesLink = makeWikilink(testcasesTitle.prefixedText, testcasesLinkDisplay)
    local testcasesRunLink = makeWikilink(testcasesTitle.talkPageTitle.prefixedText, testcasesRunLinkDisplay)
    text = text .. '<br />' .. message('sandbox-notice-testcases-run-blurb', {testcasesLink, testcasesRunLink})
    else
    else
    return nil -- The parser function returns the blank string if there is no match.
    local testcasesLinkDisplay = message('sandbox-notice-testcases-link-display')
    local testcasesLink = makeWikilink(testcasesTitle.prefixedText, testcasesLinkDisplay)
    text = text .. '<br />' .. message('sandbox-notice-testcases-blurb', {testcasesLink})
    end
    end
    end
    end
    if getProtectionLevel('move') == 'sysop' or getProtectionLevel('edit') then
    -- Add the sandbox to the sandbox category.
    -- The page is full-move protected, or full, template, or semi-protected.
    omargs.text = text .. makeCategoryLink(message('sandbox-category'))
    return frame:expandTemplate{title = protectionTemplate, args = formatMessage('protectionTemplateArgs', 'table')}
     
    -- 'documentation-clear'
    return '<div class="' .. message('clear') .. '"></div>'
    .. require('Module:Message box').main('ombox', omargs)
    end
     
    function p.protectionTemplate(env)
    -- Generates the padlock icon in the top right.
    -- @env - environment table containing title objects, etc., generated with p.getEnvironment
    -- Messages:
    -- 'protection-template' --> 'pp-template'
    -- 'protection-template-args' --> {docusage = 'yes'}
    local protectionLevels = env.protectionLevels
    if not protectionLevels then
    return nil
    end
    local editProt = protectionLevels.edit and protectionLevels.edit[1]
    local moveProt = protectionLevels.move and protectionLevels.move[1]
    if editProt then
    -- The page is edit-protected.
    return require('Module:Protection banner')._main{
    message('protection-reason-edit'), small = true
    }
    elseif moveProt and moveProt ~= 'autoconfirmed' then
    -- The page is move-protected but not edit-protected. Exclude move
    -- protection with the level "autoconfirmed", as this is equivalent to
    -- no move protection at all.
    return require('Module:Protection banner')._main{
    action = 'move', small = true
    }
    else
    return nil
    end
    end
    return nil
    end
    end
    ----------------------------------------------------------------------------
    -- Start box
    ----------------------------------------------------------------------------


    p.startBox = makeInvokeFunc('_startBox')
    p.startBox = makeInvokeFunc('_startBox')


    function p._startBox(args)
    function p._startBox(args, env)
    -- Arg processing from {{documentation}}.
    --[[
    local preload = args[formatMessage('preloadArg', 'string')] -- Allow custom preloads.
    -- This function generates the start box.
    local heading = args[formatMessage('headingArg', 'string')] -- Blank values are not removed.
    -- @args - a table of arguments passed by the user
    local headingStyle = args[formatMessage('headingStyleArg', 'string')]
    -- @env - environment table containing title objects, etc., generated with p.getEnvironment
    local content = args[formatMessage('contentArg', 'string')]
    --
    local docspace = p.docspace()
    -- The actual work is done by p.makeStartBoxLinksData and p.renderStartBoxLinks which make
    local docname = args[1] -- Other docname, if fed.
    -- the [view] [edit] [history] [purge] links, and by p.makeStartBoxData and p.renderStartBox
    local templatePage = p.templatePage()
    -- which generate the box HTML.
     
    --]]
    -- Arg processing from {{documentation/start box2}}.
    env = env or p.getEnvironment(args)
    local docpage
    local links
    if docname then
    local content = args.content
    docpage = docname
    if not content or args[1] then
    -- No need to include the links if the documentation is on the template page itself.
    local linksData = p.makeStartBoxLinksData(args, env)
    if linksData then
    links = p.renderStartBoxLinks(linksData)
    end
    end
    -- Generate the start box html.
    local data = p.makeStartBoxData(args, env, links)
    if data then
    return p.renderStartBox(data)
    else
    else
    local namespace = docspace or currentTitle.nsText
    -- User specified no heading.
    local pagename = templatePage or currentTitle.text
    return nil
    docpage = namespace .. ':' .. pagename .. '/' .. formatMessage('docSubpage', 'string')
    end
    end
    local docTitle = mw.title.new(docpage)
    end
    local docExist = docTitle.exists
    -- Output from {{documentation/start box}}.


    -- First, check the heading parameter.
    function p.makeStartBoxLinksData(args, env)
    if heading == '' then
    --[[
    -- Heading is defined but blank, so do nothing.
    -- Does initial processing of data to make the [view] [edit] [history] [purge] links.
    -- @args - a table of arguments passed by the user
    -- @env - environment table containing title objects, etc., generated with p.getEnvironment
    --
    -- Messages:
    -- 'view-link-display' --> 'view'
    -- 'edit-link-display' --> 'edit'
    -- 'history-link-display' --> 'history'
    -- 'purge-link-display' --> 'purge'
    -- 'file-docpage-preload' --> 'Template:Documentation/preload-filespace'
    -- 'module-preload' --> 'Template:Documentation/preload-module-doc'
    -- 'docpage-preload' --> 'Template:Documentation/preload'
    -- 'create-link-display' --> 'create'
    --]]
    local subjectSpace = env.subjectSpace
    local title = env.title
    local docTitle = env.docTitle
    if not title or not docTitle then
    return nil
    return nil
    end
    end
    if docTitle.isRedirect then
    docTitle = docTitle.redirectTarget
    end
    local data = {}
    data.title = title
    data.docTitle = docTitle
    -- View, display, edit, and purge links if /doc exists.
    data.viewLinkDisplay = message('view-link-display')
    data.editLinkDisplay = message('edit-link-display')
    data.historyLinkDisplay = message('history-link-display')
    data.purgeLinkDisplay = message('purge-link-display')
    -- Create link if /doc doesn't exist.
    local preload = args.preload
    if not preload then
    if subjectSpace == 6 then -- File namespace
    preload = message('file-docpage-preload')
    elseif subjectSpace == 828 then -- Module namespace
    preload = message('module-preload')
    else
    preload = message('docpage-preload')
    end
    end
    data.preload = preload
    data.createLinkDisplay = message('create-link-display')
    return data
    end


    -- Build the start box div.
    function p.renderStartBoxLinks(data)
    local sbox = htmlBuilder.create('div')
    --[[
    sbox
    -- Generates the [view][edit][history][purge] or [create] links from the data table.
    .css('padding-bottom', '3px')
    -- @data - a table of data generated by p.makeStartBoxLinksData
    .css('border-bottom', '1px solid #aaa')
    --]]
    .css('margin-bottom', '1ex')
    .newline()
    local function escapeBrackets(s)
    -- Escapes square brackets with HTML entities.
    s = s:gsub('%[', '&#91;') -- Replace square brackets with HTML entities.
    s = s:gsub('%]', '&#93;')
    return s
    end


    -- Make the heading.
    local ret
    local hspan = sbox.tag('span')
    local docTitle = data.docTitle
    if headingStyle then
    local title = data.title
    hspan.cssText(headingStyle)
    if docTitle.exists then
    elseif subjectSpace == 10 then
    local viewLink = makeWikilink(docTitle.prefixedText, data.viewLinkDisplay)
    -- We are in the template or template talk namespaces.
    local editLink = makeUrlLink(docTitle:fullUrl{action = 'edit'}, data.editLinkDisplay)
    hspan
    local historyLink = makeUrlLink(docTitle:fullUrl{action = 'history'}, data.historyLinkDisplay)
    .css('font-weight', 'bold')
    local purgeLink = makeUrlLink(title:fullUrl{action = 'purge'}, data.purgeLinkDisplay)
    .css('fond-size', '125%')
    ret = '[%s] [%s] [%s] [%s]'
    ret = escapeBrackets(ret)
    ret = mw.ustring.format(ret, viewLink, editLink, historyLink, purgeLink)
    else
    else
    hspan.css('font-size', '150%')
    local createLink = makeUrlLink(docTitle:fullUrl{action = 'edit', preload = data.preload}, data.createLinkDisplay)
    ret = '[%s]'
    ret = escapeBrackets(ret)
    ret = mw.ustring.format(ret, createLink)
    end
    return ret
    end
     
    function p.makeStartBoxData(args, env, links)
    --[=[
    -- Does initial processing of data to pass to the start-box render function, p.renderStartBox.
    -- @args - a table of arguments passed by the user
    -- @env - environment table containing title objects, etc., generated with p.getEnvironment
    -- @links - a string containing the [view][edit][history][purge] links - could be nil if there's an error.
    --
    -- Messages:
    -- 'documentation-icon-wikitext' --> '[[File:Test Template Info-Icon - Version (2).svg|50px|link=|alt=]]'
    -- 'template-namespace-heading' --> 'Template documentation'
    -- 'module-namespace-heading' --> 'Module documentation'
    -- 'file-namespace-heading' --> 'Summary'
    -- 'other-namespaces-heading' --> 'Documentation'
    -- 'testcases-create-link-display' --> 'create'
    --]=]
    local subjectSpace = env.subjectSpace
    if not subjectSpace then
    -- Default to an "other namespaces" namespace, so that we get at least some output
    -- if an error occurs.
    subjectSpace = 2
    end
    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
    end
    if heading then
    if heading then
    -- "heading" has data.
    data.heading = heading
    hspan.wikitext(heading)
    elseif subjectSpace == 10 then -- Template namespace
    elseif subjectSpace == 10 then -- Template namespace
    hspan.wikitext(formatMessage('documentationIconWikitext', 'string') .. ' ' .. formatMessage('templateNamespaceHeading', 'string'))
    data.heading = message('documentation-icon-wikitext') .. ' ' .. message('template-namespace-heading')
    elseif subjectSpace == 828 then -- Module namespace
    elseif subjectSpace == 828 then -- Module namespace
    hspan.wikitext(formatMessage('documentationIconWikitext', 'string') .. ' ' .. formatMessage('moduleNamespaceHeading', 'string'))
    data.heading = message('documentation-icon-wikitext') .. ' ' .. message('module-namespace-heading')
    elseif subjectSpace == 6 then -- File namespace
    elseif subjectSpace == 6 then -- File namespace
    hspan.wikitext(formatMessage('fileNamespaceHeading', 'string'))
    data.heading = message('file-namespace-heading')
    else
    data.heading = message('other-namespaces-heading')
    end
    -- Heading CSS
    local headingStyle = args['heading-style']
    if headingStyle then
    data.headingStyleText = headingStyle
    else
    else
    hspan.wikitext(formatMessage('otherNamespacesHeading', 'string'))
    -- 'documentation-heading'
    data.headingClass = message('main-div-heading-class')
    end
    end
    -- Data for the [view][edit][history][purge] or [create] links.
    if links then
    -- 'mw-editsection-like plainlinks'
    data.linksClass = message('start-box-link-classes')
    data.links = links
    end
    return data
    end


    -- Add the [view][edit][history][purge] or [create] links.
    function p.renderStartBox(data)
    -- Check for the content parameter first, as we don't need the links if the documentation
    -- Renders the start box html.
    -- content is being entered directly onto the template page.
    -- @data - a table of data generated by p.makeStartBoxData.
    if not content then
    local sbox = mw.html.create('div')
    local lspan = sbox.tag('span') -- lspan is short for "link span".
    sbox
    lspan
    -- 'documentation-startbox'
    .addClass(formatMessage('startBoxLinkclasses', 'string'))
    :addClass(message('start-box-class'))
    .attr('id', formatMessage('startBoxLinkId', 'string'))
    :newline()
    if docExist then
    :tag('span')
    local viewLink = makeWikilink(docpage, formatMessage('viewLinkDisplay', 'string'))
    :addClass(data.headingClass)
    local editLink = makeUrlLink(docTitle:fullUrl{action = 'edit'}, formatMessage('editLinkDisplay', 'string'))
    :cssText(data.headingStyleText)
    local historyLink = makeUrlLink(docTitle:fullUrl{action = 'history'}, formatMessage('historyLinkDisplay', 'string'))
    :wikitext(data.heading)
    local purgeLink = makeUrlLink(currentTitle:fullUrl{action = 'purge'}, formatMessage('purgeLinkDisplay', 'string'))
    local links = data.links
    local text = '[%s] [%s] [%s] [%s]'
    if links then
    text = text:gsub('%[', '&#91;') -- Replace square brackets with HTML entities.
    sbox:tag('span')
    text = text:gsub('%]', '&#93;')
    :addClass(data.linksClass)
    lspan.wikitext(mw.ustring.format(text, viewLink, editLink, historyLink, purgeLink))
    :attr('id', data.linksId)
    else
    :wikitext(links)
    if not preload then
    if subjectSpace == 6 then -- File namespace
    preload = formatMessage('fileDocpagePreload', 'string')
    else
    preload = formatMessage('docpagePreload', 'string')
    end
    end
    lspan.wikitext(makeUrlLink(docTitle:fullUrl{action = 'edit', preload = preload}, formatMessage('createLinkDisplay', 'string')))
    end
    end
    end
    return tostring(sbox)
    return tostring(sbox)
    end
    end
    ----------------------------------------------------------------------------
    -- Documentation content
    ----------------------------------------------------------------------------


    p.content = makeInvokeFunc('_content')
    p.content = makeInvokeFunc('_content')


    function p._content(args)
    function p._content(args, env)
    local content = args[formatMessage('contentArg', 'string')]
    -- Displays the documentation contents
    if not content then
    -- @args - a table of arguments passed by the user
    local docpage = args[1]
    -- @env - environment table containing title objects, etc., generated with p.getEnvironment
    if docpage and mw.title.new(docpage).exists then
    env = env or p.getEnvironment(args)
    local frame = mw.getCurrentFrame()
    local docTitle = env.docTitle
    content = frame:preprocess('{{ ' .. docpage .. ' }}')
    local content = args.content
    else
    if not content and docTitle and docTitle.exists then
    docpage = p.docspace() .. ':' .. p.templatePage() .. '/' .. formatMessage('docSubpage', 'string')
    content = args._content or mw.getCurrentFrame():expandTemplate{title = docTitle.prefixedText}
    if mw.title.new(docpage).exists then
    local frame = mw.getCurrentFrame()
    content = frame:preprocess('{{ ' .. docpage .. ' }}')
    end
    end
    end
    end
    -- The line breaks below are necessary so that "=== Headings ===" at the start and end
    -- The line breaks below are necessary so that "=== Headings ===" at the start and end
    Line 288: Line 673:
    end
    end


    p.endBox = makeInvokeFunc('_endBox')
    p.contentTitle = makeInvokeFunc('_contentTitle')


    function p._endBox(args)
    function p._contentTitle(args, env)
    -- Argument processing in {{documentation}}.
    env = env or p.getEnvironment(args)
    local content = args[formatMessage('contentArg', 'string')]
    local docTitle = env.docTitle
    local linkBox = args[formatMessage('linkBoxArg', 'string')] -- So "link box=off" works.
    if not args.content and docTitle and docTitle.exists then
    local docspace = p.docspace()
    return docTitle.prefixedText
    local docname = args[1] -- Other docname, if fed.
    local templatePage = p.templatePage()
     
    -- Argument processing in {{documentation/end box2}}.
    local docpageRoot = (docspace or currentTitle.nsText) .. ':' .. (templatePage or currentTitle.text)
    local docpage
    if docname then
    docpage = docname
    else
    else
    docpage = docpageRoot .. '/' .. formatMessage('docSubpage', 'string')
    return ''
    end
    end
    local docTitle = mw.title.new(docpage)
    end
    local docExist = docTitle.exists
    local docnameFed = args[1] and true
    local sandbox = docpageRoot .. '/' .. formatMessage('sandboxSubpage', 'string')
    local testcases = docpageRoot .. '/' .. formatMessage('testcasesSubpage', 'string')
    templatePage = currentTitle.nsText .. ':' .. templatePage


    -- Output from {{documentation/end box}}
    ----------------------------------------------------------------------------
    -- End box
    ----------------------------------------------------------------------------
     
    p.endBox = makeInvokeFunc('_endBox')
     
    function p._endBox(args, env)
    --[=[
    -- This function generates the end box (also known as the link box).
    -- @args - a table of arguments passed by the user
    -- @env - environment table containing title objects, etc., generated with p.getEnvironment
    --
    --]=]
    -- First, check whether we should output the end box at all. Add the end box by default if the documentation
    -- Get environment data.
    -- exists or if we are in the user, module or template namespaces.
    env = env or p.getEnvironment(args)
    if linkBox == formatMessage('linkBoxOff', 'string') or not (docExist or subjectSpace == 2 or subjectSpace == 828 or subjectSpace == 10) then
    local subjectSpace = env.subjectSpace
    local docTitle = env.docTitle
    if not subjectSpace or not docTitle then
    return nil
    end
    -- 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.
    local linkBox = args['link box']
    if linkBox == 'off'
    or not (
    docTitle.exists
    or subjectSpace == 2
    or subjectSpace == 828
    or subjectSpace == 10
    )
    then
    return nil
    return nil
    end
    end


    -- Assemble the arguments for {{fmbox}}.
    -- Assemble the link box.
    local fmargs = {}
    fmargs[formatMessage('fmboxIdParam', 'string')] = formatMessage('fmboxId', 'string') -- Sets fmargs.id = 'documentation-meta-data'
    fmargs[formatMessage('fmboxImageParam', 'string')] = formatMessage('fmboxImageNone', 'string') -- Sets fmargs.image = 'none'
    fmargs[formatMessage('fmboxStyleParam', 'string')] = formatMessage('fmboxStyle', 'string') -- Sets fmargs.style = 'background-color: #ecfcf4'
    fmargs[formatMessage('fmboxTextstyleParam', 'string')] = formatMessage('fmboxTextstyle', 'string') -- Sets fmargs.textstyle = 'font-style: italic;'
     
    -- Assemble the fmbox text field.
    local text = ''
    local text = ''
    if linkBox then
    if linkBox then
    -- Use custom link box content if it is defined.
    text = text .. linkBox
    text = text .. linkBox
    else
    else
    if docExist then
    text = text .. (p.makeDocPageBlurb(args, env) or '') -- "This documentation is transcluded from [[Foo]]."
    -- /doc exists; link to it.
    if subjectSpace == 2 or subjectSpace == 10 or subjectSpace == 828 then
    local docLink = makeWikilink(docpage)
    -- We are in the user, template or module namespaces.
    local editLink = makeUrlLink(docTitle:fullUrl{action = 'edit'}, formatMessage('editLinkDisplay', 'string'))
    -- Add sandbox and testcases links.
    local historyLink = makeUrlLink(docTitle:fullUrl{action = 'history'}, formatMessage('historyLinkDisplay', 'string'))
    -- "Editors can experiment in this template's sandbox and testcases pages."
    text = text .. formatMessage('transcludedFromBlurb', 'string', {docLink}) .. ' ' .. makeToolbar(editLink, historyLink) .. '<br />'
    text = text .. (p.makeExperimentBlurb(args, env) or '') .. '<br />'
    elseif subjectSpace == 828 then
    if not args.content and not args[1] then
    -- /doc does not exist; ask to create it.
    -- "Please add categories to the /doc subpage."
    local createLink = makeUrlLink(docTitle:fullUrl{action = 'edit', preload = formatMessage('modulePreload', 'string')}, formatMessage('createLinkDisplay', 'string'))
    -- Don't show this message with inline docs or with an explicitly specified doc page,
    text = text .. formatMessage('createModuleDocBlurb', 'string', {createLink}) .. '<br />'
    -- as then it is unclear where to add the categories.
    end
    text = text .. (p.makeCategoriesBlurb(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.  
    local sandboxLinks, testcasesLinks
    local pagePossessive = subjectSpace == 828 and formatMessage('modulePossessive', 'string') or formatMessage('templatePossessive', 'string')
    local sandboxTitle = mw.title.new(sandbox)
    if sandboxTitle.exists then
    local sandboxLink = makeWikilink(sandbox, formatMessage('sandboxLinkDisplay', 'string'))
    local sandboxEditLink = makeUrlLink(sandboxTitle:fullUrl{action = 'edit'}, formatMessage('sandboxEditLinkDisplay', 'string'))
    local compareLink = makeUrlLink(mw.title.new('Special:ComparePages'):fullUrl{page1 = templatePage, page2 = sandbox}, formatMessage('compareLinkDisplay', 'string'))
    sandboxLinks = sandboxLink .. ' ' .. makeToolbar(sandboxEditLink, compareLink)
    else
    local sandboxPreload = subjectSpace == 828 and formatMessage('moduleSandboxPreload', 'string') or formatMessage('templateSandboxPreload', 'string')
    local sandboxCreateLink = makeUrlLink(sandboxTitle:fullUrl{action = 'edit', preload = sandboxPreload}, formatMessage('sandboxCreateLinkDisplay', 'string'))
    local mirrorSummary = formatMessage('mirrorEditSummary', 'string', {makeWikilink(templatePage)})
    local mirrorLink = makeUrlLink(sandboxTitle:fullUrl{action = 'edit', preload = templatePage, summary = mirrorSummary}, formatMessage('mirrorLinkDisplay', 'string'))
    sandboxLinks = formatMessage('sandboxLinkDisplay', 'string') .. ' ' .. makeToolbar(sandboxCreateLink, mirrorLink)
    end
    local testcaseTitle = mw.title.new(testcases)
    if testcaseTitle.exists then
    local testcasesLink = makeWikilink(testcases, formatMessage('testcasesLinkDisplay', 'string'))
    local testcasesEditLink = makeUrlLink(testcaseTitle:fullUrl{action = 'edit'}, formatMessage('testcasesEditLinkDisplay', 'string'))
    testcasesLinks = testcasesLink .. ' ' .. makeToolbar(testcasesEditLink)
    else
    local testcasesPreload = subjectSpace == 828 and formatMessage('moduleTestcasesPreload', 'string') or formatMessage('templateTestcasesPreload', 'string')
    local testcasesCreateLink = makeUrlLink(testcaseTitle:fullUrl{action = 'edit', preload = testcasesPreload}, formatMessage('testcasesCreateLinkDisplay', 'string'))
    testcasesLinks = formatMessage('testcasesLinkDisplay', 'string') .. ' ' .. makeToolbar(testcasesCreateLink)
    end
    text = text .. formatMessage('experimentBlurb', 'string', {pagePossessive, sandboxLinks, testcasesLinks}) .. '<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, formatMessage('docLinkDisplay', 'string'))
    text = text .. formatMessage('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 = formatMessage('templatePagetype', 'string')
    elseif subjectSpace == 828 then
    pagetype = formatMessage('modulePagetype', 'string')
    else
    pagetype = formatMessage('defaultPagetype', 'string')
    end
    text = text .. ' ' .. makeWikilink('Special:PrefixIndex/' .. templatePage .. '/', formatMessage('subpagesLinkDisplay', 'string', {pagetype}))
    end
    end
    -- Show the "print" link if it exists.
    text = text .. ' ' .. (p.makeSubpagesBlurb(args, env) or '') --"Subpages of this template"
    local printPage = templatePage .. '/' .. formatMessage('printSubpage', 'string')
    local printBlurb = p.makePrintBlurb(args, env) -- Two-line blurb about print versions of templates.
    local printTitle = mw.title.new(printPage)
    if printBlurb then
    if printTitle.exists then
    text = text .. '<br />' .. printBlurb
    local printLink = makeWikilink(printPage, formatMessage('printLinkDisplay', 'string'))
    text = text .. '<br />' .. formatMessage('printBlurb', 'string', {printLink})
    .. (formatMessage('displayPrintCategory', 'boolean') and makeCategoryLink(formatMessage('printCategory', 'string')) or '')
    end
    end
    end
    end
    end
    end
    fmargs.text = text
    local box = mw.html.create('div')
    -- 'documentation-metadata'
    box:addClass(message('end-box-class'))
    -- 'plainlinks'
    :addClass(message('end-box-plainlinks'))
    :wikitext(text)
    :done()


    -- Return the fmbox output.
    return '\n' .. tostring(box)
    return messageBox.main('fmbox', fmargs)
    end
    end


    function p.addTrackingCategories()
    function p.makeDocPageBlurb(args, env)
    -- Check if {{documentation}} is transcluded on a /doc or /testcases page.
    --[=[
    local ret = ''
    -- Makes the blurb "This documentation is transcluded from [[Template:Foo]] (edit, history)".
    local subpage = currentTitle.subpageText
    -- @args - a table of arguments passed by the user
    if formatMessage('displayStrangeUsageCategory', 'boolean') and (subpage == formatMessage('docSubpage', 'string') or subpage == formatMessage('testcasesSubpage', 'string')) then
    -- @env - environment table containing title objects, etc., generated with p.getEnvironment
    local sort = (currentTitle.namespace == 0 and formatMessage('strangeUsageCategoryMainspaceSort', 'string') or '') .. currentTitle.prefixedText -- Sort on namespace.
    --
    ret = ret .. makeCategoryLink(formatMessage('strangeUsageCategory', 'string'), sort)
    -- Messages:
    -- 'edit-link-display' --> 'edit'
    -- 'history-link-display' --> 'history'
    -- 'transcluded-from-blurb' -->
    -- 'The above [[Wikipedia:Template documentation|documentation]]
    -- is [[Help:Transclusion|transcluded]] from $1.'
    -- 'module-preload' --> 'Template:Documentation/preload-module-doc'
    -- 'create-link-display' --> 'create'
    -- 'create-module-doc-blurb' -->
    -- 'You might want to $1 a documentation page for this [[Wikipedia:Lua|Scribunto module]].'
    --]=]
    local docTitle = env.docTitle
    if not docTitle then
    return nil
    end
    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('edit-link-display')
    local editLink = makeUrlLink(editUrl, editDisplay)
    local historyUrl = docTitle:fullUrl{action = 'history'}
    local historyDisplay = message('history-link-display')
    local historyLink = makeUrlLink(historyUrl, historyDisplay)
    ret = message('transcluded-from-blurb', {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('module-preload')}
    local createDisplay = message('create-link-display')
    local createLink = makeUrlLink(createUrl, createDisplay)
    ret = message('create-module-doc-blurb', {createLink})
    .. '<br />'
    end
    end
    return ret
    return ret
    end
    end


    function p.docspace()
    function p.makeExperimentBlurb(args, env)
    -- Determines the namespace of the documentation.
    --[[
    if subjectSpace == 0 or subjectSpace == 6 or subjectSpace == 8 or subjectSpace == 14 then
    -- Renders the text "Editors can experiment in this template's sandbox (edit | diff) and testcases (edit) pages."
    -- Pages in the Article, File, MediaWiki or Category namespaces must have their
    -- @args - a table of arguments passed by the user
    -- /doc, /sandbox and /testcases pages in talk space.
    -- @env - environment table containing title objects, etc., generated with p.getEnvironment
    return mw.site.namespaces[subjectSpace].talk.name
    --
    -- Messages:
    -- 'sandbox-link-display' --> 'sandbox'
    -- 'sandbox-edit-link-display' --> 'edit'
    -- 'compare-link-display' --> 'diff'
    -- 'module-sandbox-preload' --> 'Template:Documentation/preload-module-sandbox'
    -- 'template-sandbox-preload' --> 'Template:Documentation/preload-sandbox'
    -- 'sandbox-create-link-display' --> 'create'
    -- 'mirror-edit-summary' --> 'Create sandbox version of $1'
    -- 'mirror-link-display' --> 'mirror'
    -- 'mirror-link-preload' --> 'Template:Documentation/mirror'
    -- 'sandbox-link-display' --> 'sandbox'
    -- 'testcases-link-display' --> 'testcases'
    -- 'testcases-edit-link-display'--> 'edit'
    -- 'template-sandbox-preload' --> 'Template:Documentation/preload-sandbox'
    -- 'testcases-create-link-display' --> 'create'
    -- 'testcases-link-display' --> 'testcases'
    -- 'testcases-edit-link-display' --> 'edit'
    -- 'module-testcases-preload' --> 'Template:Documentation/preload-module-testcases'
    -- 'template-testcases-preload' --> 'Template:Documentation/preload-testcases'
    -- 'experiment-blurb-module' --> 'Editors can experiment in this module's $1 and $2 pages.'
    -- 'experiment-blurb-template' --> 'Editors can experiment in this template's $1 and $2 pages.'
    --]]
    local subjectSpace = env.subjectSpace
    local templateTitle = env.templateTitle
    local sandboxTitle = env.sandboxTitle
    local testcasesTitle = env.testcasesTitle
    local templatePage = templateTitle.prefixedText
    if not subjectSpace or not templateTitle or not sandboxTitle or not testcasesTitle then
    return nil
    end
    -- Make links.
    local sandboxLinks, testcasesLinks
    if sandboxTitle.exists then
    local sandboxPage = sandboxTitle.prefixedText
    local sandboxDisplay = message('sandbox-link-display')
    local sandboxLink = makeWikilink(sandboxPage, sandboxDisplay)
    local sandboxEditUrl = sandboxTitle:fullUrl{action = 'edit'}
    local sandboxEditDisplay = message('sandbox-edit-link-display')
    local sandboxEditLink = makeUrlLink(sandboxEditUrl, sandboxEditDisplay)
    local compareUrl = env.compareUrl
    local compareLink
    if compareUrl then
    local compareDisplay = message('compare-link-display')
    compareLink = makeUrlLink(compareUrl, compareDisplay)
    end
    sandboxLinks = sandboxLink .. ' ' .. makeToolbar(sandboxEditLink, compareLink)
    else
    else
    return currentTitle.subjectNsText
    local sandboxPreload
    if subjectSpace == 828 then
    sandboxPreload = message('module-sandbox-preload')
    else
    sandboxPreload = message('template-sandbox-preload')
    end
    local sandboxCreateUrl = sandboxTitle:fullUrl{action = 'edit', preload = sandboxPreload}
    local sandboxCreateDisplay = message('sandbox-create-link-display')
    local sandboxCreateLink = makeUrlLink(sandboxCreateUrl, sandboxCreateDisplay)
    local mirrorSummary = message('mirror-edit-summary', {makeWikilink(templatePage)})
    local mirrorPreload = message('mirror-link-preload')
    local mirrorUrl = sandboxTitle:fullUrl{action = 'edit', preload = mirrorPreload, summary = mirrorSummary}
    if subjectSpace == 828 then
    mirrorUrl = sandboxTitle:fullUrl{action = 'edit', preload = templateTitle.prefixedText, summary = mirrorSummary}
    end
    local mirrorDisplay = message('mirror-link-display')
    local mirrorLink = makeUrlLink(mirrorUrl, mirrorDisplay)
    sandboxLinks = message('sandbox-link-display') .. ' ' .. makeToolbar(sandboxCreateLink, mirrorLink)
    end
    end
    if testcasesTitle.exists then
    local testcasesPage = testcasesTitle.prefixedText
    local testcasesDisplay = message('testcases-link-display')
    local testcasesLink = makeWikilink(testcasesPage, testcasesDisplay)
    local testcasesEditUrl = testcasesTitle:fullUrl{action = 'edit'}
    local testcasesEditDisplay = message('testcases-edit-link-display')
    local testcasesEditLink = makeUrlLink(testcasesEditUrl, testcasesEditDisplay)
    -- for Modules, add testcases run link if exists
    if testcasesTitle.contentModel == "Scribunto"  and testcasesTitle.talkPageTitle and testcasesTitle.talkPageTitle.exists then
    local testcasesRunLinkDisplay = message('testcases-run-link-display')
    local testcasesRunLink = makeWikilink(testcasesTitle.talkPageTitle.prefixedText, testcasesRunLinkDisplay)
    testcasesLinks = testcasesLink .. ' ' .. makeToolbar(testcasesEditLink, testcasesRunLink)
    else
    testcasesLinks = testcasesLink .. ' ' .. makeToolbar(testcasesEditLink)
    end
    else
    local testcasesPreload
    if subjectSpace == 828 then
    testcasesPreload = message('module-testcases-preload')
    else
    testcasesPreload = message('template-testcases-preload')
    end
    local testcasesCreateUrl = testcasesTitle:fullUrl{action = 'edit', preload = testcasesPreload}
    local testcasesCreateDisplay = message('testcases-create-link-display')
    local testcasesCreateLink = makeUrlLink(testcasesCreateUrl, testcasesCreateDisplay)
    testcasesLinks = message('testcases-link-display') .. ' ' .. makeToolbar(testcasesCreateLink)
    end
    local messageName
    if subjectSpace == 828 then
    messageName = 'experiment-blurb-module'
    else
    messageName = 'experiment-blurb-template'
    end
    return message(messageName, {sandboxLinks, testcasesLinks})
    end
    function p.makeCategoriesBlurb(args, env)
    --[[
    -- Generates the text "Please add categories to the /doc subpage."
    -- @args - a table of arguments passed by the user
    -- @env - environment table containing title objects, etc., generated with p.getEnvironment
    -- Messages:
    -- 'doc-link-display' --> '/doc'
    -- 'add-categories-blurb' --> 'Please add categories to the $1 subpage.'
    --]]
    local docTitle = env.docTitle
    if not docTitle then
    return nil
    end
    local docPathLink = makeWikilink(docTitle.prefixedText, message('doc-link-display'))
    return message('add-categories-blurb', {docPathLink})
    end
    end


    function p.templatePage()
    function p.makeSubpagesBlurb(args, env)
    -- Determines the template page. No namespace or interwiki prefixes are included.
    --[[
    local subpage = currentTitle.subpageText
    -- Generates the "Subpages of this template" link.
    if subpage == formatMessage('sandboxSubpage', 'string') or subpage == formatMessage('testcasesSubpage', 'string') then
    -- @args - a table of arguments passed by the user
    return currentTitle.baseText
    -- @env - environment table containing title objects, etc., generated with p.getEnvironment
    -- Messages:
    -- 'template-pagetype' --> 'template'
    -- 'module-pagetype' --> 'module'
    -- 'default-pagetype' --> 'page'
    -- 'subpages-link-display' --> 'Subpages of this $1'
    --]]
    local subjectSpace = env.subjectSpace
    local templateTitle = env.templateTitle
    if not subjectSpace or not templateTitle then
    return nil
    end
    local pagetype
    if subjectSpace == 10 then
    pagetype = message('template-pagetype')
    elseif subjectSpace == 828 then
    pagetype = message('module-pagetype')
    else
    else
    return currentTitle.text
    pagetype = message('default-pagetype')
    end
    local subpagesLink = makeWikilink(
    'Special:PrefixIndex/' .. templateTitle.prefixedText .. '/',
    message('subpages-link-display', {pagetype})
    )
    return message('subpages-blurb', {subpagesLink})
    end
     
    function p.makePrintBlurb(args, env)
    --[=[
    -- Generates the blurb displayed when there is a print version of the template available.
    -- @args - a table of arguments passed by the user
    -- @env - environment table containing title objects, etc., generated with p.getEnvironment
    --
    -- Messages:
    -- 'print-link-display' --> '/Print'
    -- 'print-blurb' --> 'A [[Help:Books/for experts#Improving the book layout|print version]]'
    -- .. ' of this template exists at $1.'
    -- .. ' If you make a change to this template, please update the print version as well.'
    -- 'display-print-category' --> true
    -- 'print-category' --> 'Templates with print versions'
    --]=]
    local printTitle = env.printTitle
    if not printTitle then
    return nil
    end
    local ret
    if printTitle.exists then
    local printLink = makeWikilink(printTitle.prefixedText, message('print-link-display'))
    ret = message('print-blurb', {printLink})
    local displayPrintCategory = message('display-print-category', nil, 'boolean')
    if displayPrintCategory then
    ret = ret .. makeCategoryLink(message('print-category'))
    end
    end
    return ret
    end
     
    ----------------------------------------------------------------------------
    -- Tracking categories
    ----------------------------------------------------------------------------
     
    function p.addTrackingCategories(env)
    --[[
    -- Check if {{documentation}} is transcluded on a /doc or /testcases page.
    -- @env - environment table containing title objects, etc., generated with p.getEnvironment
    -- Messages:
    -- 'display-strange-usage-category' --> true
    -- 'doc-subpage' --> 'doc'
    -- 'testcases-subpage' --> 'testcases'
    -- 'strange-usage-category' --> 'Wikipedia pages with strange ((documentation)) usage'
    --
    -- /testcases pages in the module namespace are not categorised, as they may have
    -- {{documentation}} transcluded automatically.
    --]]
    local title = env.title
    local subjectSpace = env.subjectSpace
    if not title or not subjectSpace then
    return nil
    end
    local subpage = title.subpageText
    local ret = ''
    if message('display-strange-usage-category', nil, 'boolean')
    and (
    subpage == message('doc-subpage')
    or subjectSpace ~= 828 and subpage == message('testcases-subpage')
    )
    then
    ret = ret .. makeCategoryLink(message('strange-usage-category'))
    end
    end
    return ret
    end
    end


    return p
    return p

    Latest revision as of 11:42, 21 May 2021

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

    -- This module implements {{documentation}}.
    
    -- Get required modules.
    local getArgs = require('Module:Arguments').getArgs
    
    -- Get the config table.
    local cfg = mw.loadData('Module:Documentation/config')
    
    local p = {}
    
    -- Often-used functions.
    local ugsub = 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, valArray, expectType)
    	--[[
    	-- 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. The default type for expectType is 'string'.
    	-- 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 "foo-message" had the value 'Foo $2 bar $1.',
    	-- message('foo-message', {'baz', 'qux'}) would return "Foo qux bar baz."
    	--]]
    	local msg = cfg[cfgKey]
    	expectType = expectType or 'string'
    	if 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
    
    	return ugsub(msg, '$([1-9][0-9]*)', getMessageVal)
    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
    	-- 'documentation-toolbar'
    	return '<span class="' .. message('toolbar-class') .. '">('
    		.. table.concat(ret, ' &#124; ') .. ')</span>'
    end	
    
    p.makeToolbar = makeToolbar
    
    ----------------------------------------------------------------------------
    -- Argument processing
    ----------------------------------------------------------------------------
    
    local function makeInvokeFunc(funcName)
    	return function (frame)
    		local args = getArgs(frame, {
    			valueFunc = function (key, value)
    				if type(value) == 'string' then
    					value = value:match('^%s*(.-)%s*$') -- Remove whitespace.
    					if key == 'heading' or value ~= '' then
    						return value
    					else
    						return nil
    					end
    				else
    					return value
    				end
    			end
    		})
    		return p[funcName](args)
    	end
    end
    
    ----------------------------------------------------------------------------
    -- Entry points
    ----------------------------------------------------------------------------
    
    function p.nonexistent(frame)
    	if mw.title.getCurrentTitle().subpageText == 'testcases' then
    		return frame:expandTemplate{title = 'module test cases notice'}
    	else
    		return p.main(frame)
    	end
    end
    
    p.main = makeInvokeFunc('_main')
    
    function p._main(args)
    	--[[
    	-- This function defines logic flow for the module.
    	-- @args - table of arguments passed by the user
    	--]]
    	local env = p.getEnvironment(args)
    	local root = mw.html.create()
    	root
    		:wikitext(p._getModuleWikitext(args, env))
    		:wikitext(p.protectionTemplate(env))
    		:wikitext(p.sandboxNotice(args, env))
    		:tag('div')
    			-- 'documentation-container'
    			:addClass(message('container'))
    			:newline()
    			:tag('div')
    				-- 'documentation'
    				:addClass(message('main-div-classes'))
    				:newline()
    				:wikitext(p._startBox(args, env))
    				:wikitext(p._content(args, env))
    				:tag('div')
    					-- 'documentation-clear'
    					:addClass(message('clear'))
    					:done()
    				:newline()
    				:done()
    			:wikitext(p._endBox(args, env))
    			:done()
    		:wikitext(p.addTrackingCategories(env))
    	-- 'Module:Documentation/styles.css'
    	return mw.getCurrentFrame():extensionTag (
    		'templatestyles', '', {src=cfg['templatestyles']
    	}) .. tostring(root)
    end
    
    ----------------------------------------------------------------------------
    -- Environment settings
    ----------------------------------------------------------------------------
    
    function p.getEnvironment(args)
    	--[[
    	-- Returns a table with information about the environment, including title
    	-- objects and other namespace- or path-related data.
    	-- @args - table of arguments passed by the user
    	--
    	-- Title objects include:
    	-- env.title - the page we are making documentation for (usually the current title)
    	-- env.templateTitle - the template (or module, file, etc.)
    	-- env.docTitle - the /doc subpage.
    	-- env.sandboxTitle - the /sandbox subpage.
    	-- env.testcasesTitle - the /testcases subpage.
    	-- env.printTitle - the print version of the template, located at the /Print subpage.
    	--
    	-- Data includes:
    	-- env.protectionLevels - the protection levels table of the title object.
    	-- env.subjectSpace - the number of the title's subject namespace.
    	-- env.docSpace - the number of the namespace the title puts its documentation in.
    	-- env.docpageBase - the text of the base page of the /doc, /sandbox and /testcases pages, with namespace.
    	-- env.compareUrl - URL of the Special:ComparePages page comparing the sandbox with the template.
    	-- 
    	-- All table lookups are passed through pcall so that errors are caught. If an error occurs, the value
    	-- returned will be nil.
    	--]]
    	
    	local env, envFuncs = {}, {}
    
    	-- Set up the metatable. If triggered we call the corresponding function in the envFuncs table. The value
    	-- returned by that function is memoized in the env table so that we don't call any of the functions
    	-- more than once. (Nils won't be memoized.)
    	setmetatable(env, {
    		__index = function (t, key)
    			local envFunc = envFuncs[key]
    			if envFunc then
    				local success, val = pcall(envFunc)
    				if success then
    					env[key] = val -- Memoise the value.
    					return val
    				end
    			end
    			return nil
    		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)
    		else
    			title = mw.title.getCurrentTitle()
    		end
    		return title
    	end
    
    	function envFuncs.templateTitle()
    		--[[
    		-- The template (or module, etc.) title object.
    		-- Messages:
    		-- 'sandbox-subpage' --> 'sandbox'
    		-- 'testcases-subpage' --> 'testcases'
    		--]]
    		local subjectSpace = env.subjectSpace
    		local title = env.title
    		local subpage = title.subpageText
    		if subpage == message('sandbox-subpage') or subpage == message('testcases-subpage') then
    			return mw.title.makeTitle(subjectSpace, title.baseText)
    		else
    			return mw.title.makeTitle(subjectSpace, title.text)
    		end
    	end
    
    	function envFuncs.docTitle()
    		--[[
    		-- Title object of the /doc subpage.
    		-- Messages:
    		-- 'doc-subpage' --> 'doc'
    		--]]
    		local title = env.title
    		local docname = args[1] -- User-specified doc page.
    		local docpage
    		if docname then
    			docpage = docname
    		else
    			docpage = env.docpageBase .. '/' .. message('doc-subpage')
    		end
    		return mw.title.new(docpage)
    	end
    	
    	function envFuncs.sandboxTitle()
    		--[[
    		-- Title object for the /sandbox subpage.
    		-- Messages:
    		-- 'sandbox-subpage' --> 'sandbox'
    		--]]
    		return mw.title.new(env.docpageBase .. '/' .. message('sandbox-subpage'))
    	end
    	
    	function envFuncs.testcasesTitle()
    		--[[
    		-- Title object for the /testcases subpage.
    		-- Messages:
    		-- 'testcases-subpage' --> 'testcases'
    		--]]
    		return mw.title.new(env.docpageBase .. '/' .. message('testcases-subpage'))
    	end
    	
    	function envFuncs.printTitle()
    		--[[
    		-- Title object for the /Print subpage.
    		-- Messages:
    		-- 'print-subpage' --> 'Print'
    		--]]
    		return env.templateTitle:subPageTitle(message('print-subpage'))
    	end
    
    	function envFuncs.protectionLevels()
    		-- The protection levels table of the title object.
    		return env.title.protectionLevels
    	end
    
    	function envFuncs.subjectSpace()
    		-- The subject namespace number.
    		return mw.site.namespaces[env.title.namespace].subject.id
    	end
    
    	function envFuncs.docSpace()
    		-- The documentation namespace number. For most namespaces this is the
    		-- same as the subject namespace. However, pages in the Article, File,
    		-- MediaWiki or Category namespaces must have their /doc, /sandbox and
    		-- /testcases pages in talk space.
    		local subjectSpace = env.subjectSpace
    		if subjectSpace == 0 or subjectSpace == 6 or subjectSpace == 8 or subjectSpace == 14 then
    			return subjectSpace + 1
    		else
    			return subjectSpace
    		end
    	end
    
    	function envFuncs.docpageBase()
    		-- The base page of the /doc, /sandbox, and /testcases subpages.
    		-- For some namespaces this is the talk page, rather than the template page.
    		local templateTitle = env.templateTitle
    		local docSpace = env.docSpace
    		local docSpaceText = mw.site.namespaces[docSpace].name
    		-- Assemble the link. docSpace is never the main namespace, so we can hardcode the colon.
    		return docSpaceText .. ':' .. templateTitle.text
    	end
    	
    	function envFuncs.compareUrl()
    		-- Diff link between the sandbox and the main template using [[Special:ComparePages]].
    		local templateTitle = env.templateTitle
    		local sandboxTitle = env.sandboxTitle
    		if templateTitle.exists and sandboxTitle.exists then
    			local compareUrl = mw.uri.fullUrl(
    				'Special:ComparePages',
    				{ page1 = templateTitle.prefixedText, page2 = sandboxTitle.prefixedText}
    			)
    			return tostring(compareUrl)
    		else
    			return nil
    		end
    	end		
    
    	return env
    end	
    
    ----------------------------------------------------------------------------
    -- Auxiliary templates
    ----------------------------------------------------------------------------
    
    p.getModuleWikitext = makeInvokeFunc('_getModuleWikitext')
    
    function p._getModuleWikitext(args, env)
    	local currentTitle = mw.title.getCurrentTitle()
    	if currentTitle.contentModel ~= 'Scribunto' then return end
    	pcall(require, currentTitle.prefixedText) -- if it fails, we don't care
    	local moduleWikitext =  package.loaded["Module:Module wikitext"]
    	if moduleWikitext then
    		return moduleWikitext.main()
    	end
    end
    
    function p.sandboxNotice(args, env)
    	--[=[
    	-- Generates a sandbox notice for display above sandbox pages.
    	-- @args - a table of arguments passed by the user
    	-- @env - environment table containing title objects, etc., generated with p.getEnvironment
    	-- 
    	-- Messages:
    	-- 'sandbox-notice-image' --> '[[Image:Sandbox.svg|50px|alt=|link=]]'
    	-- 'sandbox-notice-blurb' --> 'This is the $1 for $2.'
    	-- 'sandbox-notice-diff-blurb' --> 'This is the $1 for $2 ($3).'
    	-- 'sandbox-notice-pagetype-template' --> '[[Wikipedia:Template test cases|template sandbox]] page'
    	-- 'sandbox-notice-pagetype-module' --> '[[Wikipedia:Template test cases|module sandbox]] page'
    	-- 'sandbox-notice-pagetype-other' --> 'sandbox page'
    	-- 'sandbox-notice-compare-link-display' --> 'diff'
    	-- 'sandbox-notice-testcases-blurb' --> 'See also the companion subpage for $1.'
    	-- 'sandbox-notice-testcases-link-display' --> 'test cases'
    	-- 'sandbox-category' --> 'Template sandboxes'
    	--]=]
    	local title = env.title
    	local sandboxTitle = env.sandboxTitle
    	local templateTitle = env.templateTitle
    	local subjectSpace = env.subjectSpace
    	if not (subjectSpace and title and sandboxTitle and templateTitle
    		and mw.title.equals(title, sandboxTitle)) then
    		return nil
    	end
    	-- Build the table of arguments to pass to {{ombox}}. We need just two fields, "image" and "text".
    	local omargs = {}
    	omargs.image = message('sandbox-notice-image')
    	-- Get the text. We start with the opening blurb, which is something like
    	-- "This is the template sandbox for [[Template:Foo]] (diff)."
    	local text = ''
    	local pagetype
    	if subjectSpace == 10 then
    		pagetype = message('sandbox-notice-pagetype-template')
    	elseif subjectSpace == 828 then
    		pagetype = message('sandbox-notice-pagetype-module')
    	else
    		pagetype = message('sandbox-notice-pagetype-other')
    	end
    	local templateLink = makeWikilink(templateTitle.prefixedText)
    	local compareUrl = env.compareUrl
    	if compareUrl then
    		local compareDisplay = message('sandbox-notice-compare-link-display')
    		local compareLink = makeUrlLink(compareUrl, compareDisplay)
    		text = text .. message('sandbox-notice-diff-blurb', {pagetype, templateLink, compareLink})
    	else
    		text = text .. message('sandbox-notice-blurb', {pagetype, templateLink})
    	end
    	-- Get the test cases page blurb if the page exists. This is something like
    	-- "See also the companion subpage for [[Template:Foo/testcases|test cases]]."
    	local testcasesTitle = env.testcasesTitle
    	if testcasesTitle and testcasesTitle.exists then
    		if testcasesTitle.contentModel == "Scribunto" then
    			local testcasesLinkDisplay = message('sandbox-notice-testcases-link-display')
    			local testcasesRunLinkDisplay = message('sandbox-notice-testcases-run-link-display')
    			local testcasesLink = makeWikilink(testcasesTitle.prefixedText, testcasesLinkDisplay)
    			local testcasesRunLink = makeWikilink(testcasesTitle.talkPageTitle.prefixedText, testcasesRunLinkDisplay)
    			text = text .. '<br />' .. message('sandbox-notice-testcases-run-blurb', {testcasesLink, testcasesRunLink})
    		else
    			local testcasesLinkDisplay = message('sandbox-notice-testcases-link-display')
    			local testcasesLink = makeWikilink(testcasesTitle.prefixedText, testcasesLinkDisplay)
    			text = text .. '<br />' .. message('sandbox-notice-testcases-blurb', {testcasesLink})
    		end
    	end
    	-- Add the sandbox to the sandbox category.
    	omargs.text = text .. makeCategoryLink(message('sandbox-category'))
    
    	-- 'documentation-clear'
    	return '<div class="' .. message('clear') .. '"></div>'
    		.. require('Module:Message box').main('ombox', omargs)
    end
    
    function p.protectionTemplate(env)
    	-- Generates the padlock icon in the top right.
    	-- @env - environment table containing title objects, etc., generated with p.getEnvironment
    	-- Messages:
    	-- 'protection-template' --> 'pp-template'
    	-- 'protection-template-args' --> {docusage = 'yes'}
    	local protectionLevels = env.protectionLevels
    	if not protectionLevels then
    		return nil
    	end
    	local editProt = protectionLevels.edit and protectionLevels.edit[1]
    	local moveProt = protectionLevels.move and protectionLevels.move[1]
    	if editProt then
    		-- The page is edit-protected.
    		return require('Module:Protection banner')._main{
    			message('protection-reason-edit'), small = true
    		}
    	elseif moveProt and moveProt ~= 'autoconfirmed' then
    		-- The page is move-protected but not edit-protected. Exclude move
    		-- protection with the level "autoconfirmed", as this is equivalent to
    		-- no move protection at all.
    		return require('Module:Protection banner')._main{
    			action = 'move', small = true
    		}
    	else
    		return nil
    	end
    end
    
    ----------------------------------------------------------------------------
    -- Start box
    ----------------------------------------------------------------------------
    
    p.startBox = makeInvokeFunc('_startBox')
    
    function p._startBox(args, env)
    	--[[
    	-- This function generates the start box.
    	-- @args - a table of arguments passed by the user
    	-- @env - environment table containing title objects, etc., generated with p.getEnvironment
    	-- 
    	-- The actual work is done by p.makeStartBoxLinksData and p.renderStartBoxLinks which make
    	-- the [view] [edit] [history] [purge] links, and by p.makeStartBoxData and p.renderStartBox
    	-- which generate the box HTML.
    	--]]
    	env = env or p.getEnvironment(args)
    	local links
    	local content = args.content
    	if not content or args[1] then
    		-- No need to include the links if the documentation is on the template page itself.
    		local linksData = p.makeStartBoxLinksData(args, env)
    		if linksData then
    			links = p.renderStartBoxLinks(linksData)
    		end
    	end
    	-- Generate the start box html.
    	local data = p.makeStartBoxData(args, env, links)
    	if data then
    		return p.renderStartBox(data)
    	else
    		-- User specified no heading.
    		return nil
    	end
    end
    
    function p.makeStartBoxLinksData(args, env)
    	--[[
    	-- Does initial processing of data to make the [view] [edit] [history] [purge] links.
    	-- @args - a table of arguments passed by the user
    	-- @env - environment table containing title objects, etc., generated with p.getEnvironment
    	-- 
    	-- Messages:
    	-- 'view-link-display' --> 'view'
    	-- 'edit-link-display' --> 'edit'
    	-- 'history-link-display' --> 'history'
    	-- 'purge-link-display' --> 'purge'
    	-- 'file-docpage-preload' --> 'Template:Documentation/preload-filespace'
    	-- 'module-preload' --> 'Template:Documentation/preload-module-doc'
    	-- 'docpage-preload' --> 'Template:Documentation/preload'
    	-- 'create-link-display' --> 'create'
    	--]]
    	local subjectSpace = env.subjectSpace
    	local title = env.title
    	local docTitle = env.docTitle
    	if not title or not docTitle then
    		return nil
    	end
    	if docTitle.isRedirect then 
    		docTitle = docTitle.redirectTarget
    	end
    
    	local data = {}
    	data.title = title
    	data.docTitle = docTitle
    	-- View, display, edit, and purge links if /doc exists.
    	data.viewLinkDisplay = message('view-link-display')
    	data.editLinkDisplay = message('edit-link-display')
    	data.historyLinkDisplay = message('history-link-display')
    	data.purgeLinkDisplay = message('purge-link-display')
    	-- Create link if /doc doesn't exist.
    	local preload = args.preload
    	if not preload then
    		if subjectSpace == 6 then -- File namespace
    			preload = message('file-docpage-preload')
    		elseif subjectSpace == 828 then -- Module namespace
    			preload = message('module-preload')
    		else
    			preload = message('docpage-preload')
    		end
    	end
    	data.preload = preload
    	data.createLinkDisplay = message('create-link-display')
    	return data
    end
    
    function p.renderStartBoxLinks(data)
    	--[[
    	-- Generates the [view][edit][history][purge] or [create] links from the data table.
    	-- @data - a table of data generated by p.makeStartBoxLinksData
    	--]]
    	
    	local function escapeBrackets(s)
    		-- Escapes square brackets with HTML entities.
    		s = s:gsub('%[', '&#91;') -- Replace square brackets with HTML entities.
    		s = s:gsub('%]', '&#93;')
    		return s
    	end
    
    	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 = escapeBrackets(ret)
    		ret = mw.ustring.format(ret, viewLink, editLink, historyLink, purgeLink)
    	else
    		local createLink = makeUrlLink(docTitle:fullUrl{action = 'edit', preload = data.preload}, data.createLinkDisplay)
    		ret = '[%s]'
    		ret = escapeBrackets(ret)
    		ret = mw.ustring.format(ret, createLink)
    	end
    	return ret
    end
    
    function p.makeStartBoxData(args, env, links)
    	--[=[
    	-- Does initial processing of data to pass to the start-box render function, p.renderStartBox.
    	-- @args - a table of arguments passed by the user
    	-- @env - environment table containing title objects, etc., generated with p.getEnvironment
    	-- @links - a string containing the [view][edit][history][purge] links - could be nil if there's an error.
    	--
    	-- Messages:
    	-- 'documentation-icon-wikitext' --> '[[File:Test Template Info-Icon - Version (2).svg|50px|link=|alt=]]'
    	-- 'template-namespace-heading' --> 'Template documentation'
    	-- 'module-namespace-heading' --> 'Module documentation'
    	-- 'file-namespace-heading' --> 'Summary'
    	-- 'other-namespaces-heading' --> 'Documentation'
    	-- 'testcases-create-link-display' --> 'create'
    	--]=]
    	local subjectSpace = env.subjectSpace
    	if not subjectSpace then
    		-- Default to an "other namespaces" namespace, so that we get at least some output
    		-- if an error occurs.
    		subjectSpace = 2
    	end
    	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('documentation-icon-wikitext') .. ' ' .. message('template-namespace-heading')
    	elseif subjectSpace == 828 then -- Module namespace
    		data.heading = message('documentation-icon-wikitext') .. ' ' .. message('module-namespace-heading')
    	elseif subjectSpace == 6 then -- File namespace
    		data.heading = message('file-namespace-heading')
    	else
    		data.heading = message('other-namespaces-heading')
    	end
    	
    	-- Heading CSS
    	local headingStyle = args['heading-style']
    	if headingStyle then
    		data.headingStyleText = headingStyle
    	else
    		-- 'documentation-heading'
    		data.headingClass = message('main-div-heading-class')
    	end
    	
    	-- Data for the [view][edit][history][purge] or [create] links.
    	if links then
    		-- 'mw-editsection-like plainlinks'
    		data.linksClass = message('start-box-link-classes')
    		data.links = links
    	end
    	
    	return data
    end
    
    function p.renderStartBox(data)
    	-- Renders the start box html.
    	-- @data - a table of data generated by p.makeStartBoxData.
    	local sbox = mw.html.create('div')
    	sbox
    		-- 'documentation-startbox'
    		:addClass(message('start-box-class'))
    		:newline()
    		:tag('span')
    			:addClass(data.headingClass)
    			:cssText(data.headingStyleText)
    			: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)
    	-- Displays the documentation contents
    	-- @args - a table of arguments passed by the user
    	-- @env - environment table containing title objects, etc., generated with p.getEnvironment
    	env = env or p.getEnvironment(args)
    	local docTitle = env.docTitle
    	local content = args.content
    	if not content and docTitle and docTitle.exists then
    		content = args._content or mw.getCurrentFrame():expandTemplate{title = docTitle.prefixedText}
    	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
    
    p.contentTitle = makeInvokeFunc('_contentTitle')
    
    function p._contentTitle(args, env)
    	env = env or p.getEnvironment(args)
    	local docTitle = env.docTitle
    	if not args.content and docTitle and docTitle.exists then
    		return docTitle.prefixedText
    	else
    		return ''
    	end
    end
    
    ----------------------------------------------------------------------------
    -- End box
    ----------------------------------------------------------------------------
    
    p.endBox = makeInvokeFunc('_endBox')
    
    function p._endBox(args, env)
    	--[=[
    	-- This function generates the end box (also known as the link box).
    	-- @args - a table of arguments passed by the user
    	-- @env - environment table containing title objects, etc., generated with p.getEnvironment
    	-- 
    	--]=]
    	
    	-- Get environment data.
    	env = env or p.getEnvironment(args)
    	local subjectSpace = env.subjectSpace
    	local docTitle = env.docTitle
    	if not subjectSpace or not docTitle then
    		return nil
    	end
    		
    	-- 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.
    	local linkBox = args['link box']
    	if linkBox == 'off'
    		or not (
    			docTitle.exists
    			or subjectSpace == 2
    			or subjectSpace == 828
    			or subjectSpace == 10
    		)
    	then
    		return nil
    	end
    
    	-- Assemble the link box.
    	local text = ''
    	if linkBox then
    		text = text .. linkBox
    	else
    		text = text .. (p.makeDocPageBlurb(args, env) or '') -- "This documentation is transcluded from [[Foo]]." 
    		if subjectSpace == 2 or subjectSpace == 10 or subjectSpace == 828 then
    			-- We are in the user, template or module namespaces.
    			-- Add sandbox and testcases links.
    			-- "Editors can experiment in this template's sandbox and testcases pages."
    			text = text .. (p.makeExperimentBlurb(args, env) or '') .. '<br />'
    			if not args.content and not args[1] then
    				-- "Please add categories to the /doc subpage."
    				-- Don't show this message with inline docs or with an explicitly specified doc page,
    				-- as then it is unclear where to add the categories.
    				text = text .. (p.makeCategoriesBlurb(args, env) or '')
    			end
    			text = text .. ' ' .. (p.makeSubpagesBlurb(args, env) or '') --"Subpages of this template"
    			local printBlurb = p.makePrintBlurb(args, env) -- Two-line blurb about print versions of templates.
    			if printBlurb then
    				text = text .. '<br />' .. printBlurb
    			end
    		end
    	end
    	
    	local box = mw.html.create('div')
    	-- 'documentation-metadata'
    	box:addClass(message('end-box-class'))
    		-- 'plainlinks'
    		:addClass(message('end-box-plainlinks'))
    		:wikitext(text)
    		:done()
    
    	return '\n' .. tostring(box)
    end
    
    function p.makeDocPageBlurb(args, env)
    	--[=[
    	-- Makes the blurb "This documentation is transcluded from [[Template:Foo]] (edit, history)".
    	-- @args - a table of arguments passed by the user
    	-- @env - environment table containing title objects, etc., generated with p.getEnvironment
    	-- 
    	-- Messages:
    	-- 'edit-link-display' --> 'edit'
    	-- 'history-link-display' --> 'history'
    	-- 'transcluded-from-blurb' --> 
    	-- 'The above [[Wikipedia:Template documentation|documentation]] 
    	-- is [[Help:Transclusion|transcluded]] from $1.'
    	-- 'module-preload' --> 'Template:Documentation/preload-module-doc'
    	-- 'create-link-display' --> 'create'
    	-- 'create-module-doc-blurb' -->
    	-- 'You might want to $1 a documentation page for this [[Wikipedia:Lua|Scribunto module]].'
    	--]=]
    	local docTitle = env.docTitle
    	if not docTitle then
    		return nil
    	end
    	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('edit-link-display')
    		local editLink = makeUrlLink(editUrl, editDisplay)
    		local historyUrl = docTitle:fullUrl{action = 'history'}
    		local historyDisplay = message('history-link-display')
    		local historyLink = makeUrlLink(historyUrl, historyDisplay)
    		ret = message('transcluded-from-blurb', {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('module-preload')}
    		local createDisplay = message('create-link-display')
    		local createLink = makeUrlLink(createUrl, createDisplay)
    		ret = message('create-module-doc-blurb', {createLink})
    			.. '<br />'
    	end
    	return ret
    end
    
    function p.makeExperimentBlurb(args, env)
    	--[[
    	-- Renders the text "Editors can experiment in this template's sandbox (edit | diff) and testcases (edit) pages."
    	-- @args - a table of arguments passed by the user
    	-- @env - environment table containing title objects, etc., generated with p.getEnvironment
    	-- 
    	-- Messages:
    	-- 'sandbox-link-display' --> 'sandbox'
    	-- 'sandbox-edit-link-display' --> 'edit'
    	-- 'compare-link-display' --> 'diff'
    	-- 'module-sandbox-preload' --> 'Template:Documentation/preload-module-sandbox'
    	-- 'template-sandbox-preload' --> 'Template:Documentation/preload-sandbox'
    	-- 'sandbox-create-link-display' --> 'create'
    	-- 'mirror-edit-summary' --> 'Create sandbox version of $1'
    	-- 'mirror-link-display' --> 'mirror'
    	-- 'mirror-link-preload' --> 'Template:Documentation/mirror'
    	-- 'sandbox-link-display' --> 'sandbox'
    	-- 'testcases-link-display' --> 'testcases'
    	-- 'testcases-edit-link-display'--> 'edit'
    	-- 'template-sandbox-preload' --> 'Template:Documentation/preload-sandbox'
    	-- 'testcases-create-link-display' --> 'create'
    	-- 'testcases-link-display' --> 'testcases'
    	-- 'testcases-edit-link-display' --> 'edit'
    	-- 'module-testcases-preload' --> 'Template:Documentation/preload-module-testcases'
    	-- 'template-testcases-preload' --> 'Template:Documentation/preload-testcases'
    	-- 'experiment-blurb-module' --> 'Editors can experiment in this module's $1 and $2 pages.'
    	-- 'experiment-blurb-template' --> 'Editors can experiment in this template's $1 and $2 pages.'
    	--]]
    	local subjectSpace = env.subjectSpace
    	local templateTitle = env.templateTitle
    	local sandboxTitle = env.sandboxTitle
    	local testcasesTitle = env.testcasesTitle
    	local templatePage = templateTitle.prefixedText
    	if not subjectSpace or not templateTitle or not sandboxTitle or not testcasesTitle then
    		return nil
    	end
    	-- Make links.
    	local sandboxLinks, testcasesLinks
    	if sandboxTitle.exists then
    		local sandboxPage = sandboxTitle.prefixedText
    		local sandboxDisplay = message('sandbox-link-display')
    		local sandboxLink = makeWikilink(sandboxPage, sandboxDisplay)
    		local sandboxEditUrl = sandboxTitle:fullUrl{action = 'edit'}
    		local sandboxEditDisplay = message('sandbox-edit-link-display')
    		local sandboxEditLink = makeUrlLink(sandboxEditUrl, sandboxEditDisplay)
    		local compareUrl = env.compareUrl
    		local compareLink
    		if compareUrl then
    			local compareDisplay = message('compare-link-display')
    			compareLink = makeUrlLink(compareUrl, compareDisplay)
    		end
    		sandboxLinks = sandboxLink .. ' ' .. makeToolbar(sandboxEditLink, compareLink)
    	else
    		local sandboxPreload
    		if subjectSpace == 828 then
    			sandboxPreload = message('module-sandbox-preload')
    		else
    			sandboxPreload = message('template-sandbox-preload')
    		end
    		local sandboxCreateUrl = sandboxTitle:fullUrl{action = 'edit', preload = sandboxPreload}
    		local sandboxCreateDisplay = message('sandbox-create-link-display')
    		local sandboxCreateLink = makeUrlLink(sandboxCreateUrl, sandboxCreateDisplay)
    		local mirrorSummary = message('mirror-edit-summary', {makeWikilink(templatePage)})
    		local mirrorPreload = message('mirror-link-preload')
    		local mirrorUrl = sandboxTitle:fullUrl{action = 'edit', preload = mirrorPreload, summary = mirrorSummary}
    		if subjectSpace == 828 then
    			mirrorUrl = sandboxTitle:fullUrl{action = 'edit', preload = templateTitle.prefixedText, summary = mirrorSummary}
    		end
    		local mirrorDisplay = message('mirror-link-display')
    		local mirrorLink = makeUrlLink(mirrorUrl, mirrorDisplay)
    		sandboxLinks = message('sandbox-link-display') .. ' ' .. makeToolbar(sandboxCreateLink, mirrorLink)
    	end
    	if testcasesTitle.exists then
    		local testcasesPage = testcasesTitle.prefixedText
    		local testcasesDisplay = message('testcases-link-display')
    		local testcasesLink = makeWikilink(testcasesPage, testcasesDisplay)
    		local testcasesEditUrl = testcasesTitle:fullUrl{action = 'edit'}
    		local testcasesEditDisplay = message('testcases-edit-link-display')
    		local testcasesEditLink = makeUrlLink(testcasesEditUrl, testcasesEditDisplay)
    		-- for Modules, add testcases run link if exists
    		if testcasesTitle.contentModel == "Scribunto"  and testcasesTitle.talkPageTitle and testcasesTitle.talkPageTitle.exists then
    			local testcasesRunLinkDisplay = message('testcases-run-link-display')
    			local testcasesRunLink = makeWikilink(testcasesTitle.talkPageTitle.prefixedText, testcasesRunLinkDisplay)
    			testcasesLinks = testcasesLink .. ' ' .. makeToolbar(testcasesEditLink, testcasesRunLink)
    		else
    			testcasesLinks = testcasesLink .. ' ' .. makeToolbar(testcasesEditLink)
    		end
    	else
    		local testcasesPreload
    		if subjectSpace == 828 then
    			testcasesPreload = message('module-testcases-preload')
    		else
    			testcasesPreload = message('template-testcases-preload')
    		end
    		local testcasesCreateUrl = testcasesTitle:fullUrl{action = 'edit', preload = testcasesPreload}
    		local testcasesCreateDisplay = message('testcases-create-link-display')
    		local testcasesCreateLink = makeUrlLink(testcasesCreateUrl, testcasesCreateDisplay)
    		testcasesLinks = message('testcases-link-display') .. ' ' .. makeToolbar(testcasesCreateLink)
    	end
    	local messageName
    	if subjectSpace == 828 then
    		messageName = 'experiment-blurb-module'
    	else
    		messageName = 'experiment-blurb-template'
    	end
    	return message(messageName, {sandboxLinks, testcasesLinks})
    end
    
    function p.makeCategoriesBlurb(args, env)
    	--[[
    	-- Generates the text "Please add categories to the /doc subpage."
    	-- @args - a table of arguments passed by the user
    	-- @env - environment table containing title objects, etc., generated with p.getEnvironment
    	-- Messages:
    	-- 'doc-link-display' --> '/doc'
    	-- 'add-categories-blurb' --> 'Please add categories to the $1 subpage.'
    	--]]
    	local docTitle = env.docTitle
    	if not docTitle then
    		return nil
    	end
    	local docPathLink = makeWikilink(docTitle.prefixedText, message('doc-link-display'))
    	return message('add-categories-blurb', {docPathLink})
    end
    
    function p.makeSubpagesBlurb(args, env)
    	--[[
    	-- Generates the "Subpages of this template" link.
    	-- @args - a table of arguments passed by the user
    	-- @env - environment table containing title objects, etc., generated with p.getEnvironment
    	
    	-- Messages:
    	-- 'template-pagetype' --> 'template'
    	-- 'module-pagetype' --> 'module'
    	-- 'default-pagetype' --> 'page'
    	-- 'subpages-link-display' --> 'Subpages of this $1'
    	--]]
    	local subjectSpace = env.subjectSpace
    	local templateTitle = env.templateTitle
    	if not subjectSpace or not templateTitle then
    		return nil
    	end
    	local pagetype
    	if subjectSpace == 10 then
    		pagetype = message('template-pagetype')
    	elseif subjectSpace == 828 then
    		pagetype = message('module-pagetype')
    	else
    		pagetype = message('default-pagetype')
    	end
    	local subpagesLink = makeWikilink(
    		'Special:PrefixIndex/' .. templateTitle.prefixedText .. '/',
    		message('subpages-link-display', {pagetype})
    	)
    	return message('subpages-blurb', {subpagesLink})
    end
    
    function p.makePrintBlurb(args, env)
    	--[=[
    	-- Generates the blurb displayed when there is a print version of the template available.
    	-- @args - a table of arguments passed by the user
    	-- @env - environment table containing title objects, etc., generated with p.getEnvironment
    	--
    	-- Messages:
    	-- 'print-link-display' --> '/Print'
    	-- 'print-blurb' --> 'A [[Help:Books/for experts#Improving the book layout|print version]]'
    	--		.. ' of this template exists at $1.'
    	--		.. ' If you make a change to this template, please update the print version as well.'
    	-- 'display-print-category' --> true
    	-- 'print-category' --> 'Templates with print versions'
    	--]=]
    	local printTitle = env.printTitle
    	if not printTitle then
    		return nil
    	end
    	local ret
    	if printTitle.exists then
    		local printLink = makeWikilink(printTitle.prefixedText, message('print-link-display'))
    		ret = message('print-blurb', {printLink})
    		local displayPrintCategory = message('display-print-category', nil, 'boolean')
    		if displayPrintCategory then
    			ret = ret .. makeCategoryLink(message('print-category'))
    		end
    	end
    	return ret
    end
    
    ----------------------------------------------------------------------------
    -- Tracking categories
    ----------------------------------------------------------------------------
    
    function p.addTrackingCategories(env)
    	--[[
    	-- Check if {{documentation}} is transcluded on a /doc or /testcases page.
    	-- @env - environment table containing title objects, etc., generated with p.getEnvironment
    	
    	-- Messages:
    	-- 'display-strange-usage-category' --> true
    	-- 'doc-subpage' --> 'doc'
    	-- 'testcases-subpage' --> 'testcases'
    	-- 'strange-usage-category' --> 'Wikipedia pages with strange ((documentation)) usage'
    	-- 
    	-- /testcases pages in the module namespace are not categorised, as they may have
    	-- {{documentation}} transcluded automatically.
    	--]]
    	local title = env.title
    	local subjectSpace = env.subjectSpace
    	if not title or not subjectSpace then
    		return nil
    	end
    	local subpage = title.subpageText
    	local ret = ''
    	if message('display-strange-usage-category', nil, 'boolean')
    		and (
    			subpage == message('doc-subpage')
    			or subjectSpace ~= 828 and subpage == message('testcases-subpage')
    		)
    	then
    		ret = ret .. makeCategoryLink(message('strange-usage-category'))
    	end
    	return ret
    end
    
    return p