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This module displays a section containing documentation for templates, modules, or other pages. It implements the {{documentation}} template.

Usage from wikitext[]

In most cases, you should use the {{documentation}} template. Refer to the template's documentation for usage instructions and parameters.

Usage from other modules[]

To use this module from another module, first require it:

local documentation = require('Module:Documentation').main

Then call the function with a table of arguments:

documentation{content = 'Some documentation', ['link box'] = 'My custom link box'}

Refer to the {{documentation}} template's documentation for usage instructions and parameters.

-- This module implements {{documentation}}.

-- Get required modules.
local getArgs = require('Module:Arguments').getArgs
local messageBox = require('Module:Message box')

-- 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

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

p.message = message

local function makeWikilink(page, display)
    if display then
        return mw.ustring.format('[[%s|%s]]', page, display)
    else
        return mw.ustring.format('[[%s]]', page)
    end
end

p.makeWikilink = makeWikilink

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

p.makeCategoryLink = makeCategoryLink

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

p.makeUrlLink = makeUrlLink

local function makeToolbar(...)
    local ret = {}
    local lim = select('#', ...)
    if lim < 1 then
        return nil
    end
    for i = 1, lim do
        ret[#ret + 1] = select(i, ...)
    end
    local toolbar = mw.html.create('span')
    toolbar
        :addClass(message('end-box-toolbar-classes'))
        :wikitext('(' .. table.concat(ret, ' &#124; ') .. ')')
    return tostring(toolbar)
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

----------------------------------------------------------------------------
-- Main function
----------------------------------------------------------------------------

p.main = makeInvokeFunc('_main')

function p._main(args)
    --[[
    -- This function defines logic flow for the module.
    -- @args - table of arguments passed by the user
    -- 
    -- Messages:
    -- 'main-div-id' --> 'template-documentation'
    -- 'main-div-classes' --> 'template-documentation iezoomfix'
    --]]
    local env = p.getEnvironment(args)
    local root = mw.html.create()
    root
        :wikitext(p.protectionTemplate(env))
        :wikitext(p.sandboxNotice(args, env))
         -- This div tag is from {{documentation/start box}}, but moving it here
         -- so that we don't have to worry about unclosed tags.
        :tag('div')
            :attr('id', message('main-div-id'))
            :addClass(message('main-div-classes'))
            :addClass('clearfix')
            :newline()
            :wikitext(p._startBox(args, env))
            :wikitext(p._content(args, env))
            :done()
        :wikitext(p._endBox(args, env))
        :wikitext(p.addTrackingCategories(env))
    return 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, Category or Widget
        -- 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 or subjectSpace == 274 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
----------------------------------------------------------------------------

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.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.
    text = text .. makeCategoryLink(message('sandbox-category'))
    omargs.text = text
    local ret = '<div style="clear: both;"></div>'
    ret = ret .. messageBox.main('ombox', omargs)
    return ret
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, mProtectionBanner
    local title = env.title
    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.
        mProtectionBanner = require('Module:Protection banner')
        local reason = message('protection-reason-edit')
        return mProtectionBanner._main{reason, 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.
        mProtectionBanner = require('Module:Protection banner')
        return mProtectionBanner._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' --> 'просмотр'
    -- 'edit-link-display' --> 'править'
    -- 'history-link-display' --> 'история'
    -- 'purge-link-display' --> 'очистить'
    -- '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'
    -- 'widget-namespace-heading' --> 'Widget documentation'
    -- 'file-namespace-heading' --> 'Summary'
    -- 'other-namespaces-heading' --> 'Documentation'
    -- 'start-box-classes' --> 'template-documentation__start'
    -- 'start-box-heading-classes' --> 'template-documentation__heading'
    -- 'start-box-links-id' --> 'doc_editlinks'
    -- 'start-box-links-classes' --> 'mw-editsection-like plainlinks'
    -- '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 == 274 then -- Widget namespace
        data.heading = message('documentation-icon-wikitext') .. ' ' .. message('widget-namespace-heading')
    elseif subjectSpace == 6 then -- File namespace
        data.heading = message('file-namespace-heading')
    else
        data.heading = message('other-namespaces-heading')
    end

    -- CSS
    data.startClass = message('start-box-classes');
    
    -- Heading CSS
    data.headingClass = message('start-box-heading-classes');
    local headingStyle = args['heading-style']
    if headingStyle then
        data.headingStyleText = headingStyle
    end
    
    -- Data for the [view][edit][history][purge] or [create] links.
    if links then
        data.linksId = message('start-box-links-id')
        data.linksClass = message('start-box-links-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
        :addClass(data.startClass)
        :newline()
        :tag('span')
            :addClass(data.headingClass)
            :cssText(data.headingStyleText)
            :wikitext(data.heading)
    local links = data.links
    if links then
        sbox:tag('span')
            :attr('id', data.linksId)
            :addClass(data.linksClass)
            :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
    -- 
    -- Messages:
    -- 'end-box-id' --> 'documentation-meta-data'
    -- 'end-box-classes' --> 'template-documentation__end'
    --]=]
    
    -- 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 end box text
    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.
            -- "Редакторы могут экспериментировать в песочнице этого шаблона и в тестовых страницах."
            text = text .. (p.makeExperimentBlurb(args, env) or '')
            text = text .. '<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 endId = message('end-box-id')
    local endClass = message('end-box-classes')
    local ebox = mw.html.create('div')
    ebox
        :attr('id', endId)
        :addClass(endClass)
        :newline()
        :wikitext(text)
    return tostring(ebox)
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' --> 
    -- 'Вышеприведенная [[Wikipedia:Template documentation|документация]] 
    -- [[Wikipedia:Transclusion|извлекается]] из $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 == 10 then
        -- /doc does not exist for this template; ask to create it.
        local createUrl = docTitle:fullUrl{action = 'edit', preload = message('docpage-preload')}
        local createDisplay = message('create-link-display')
        local createLink = makeUrlLink(createUrl, createDisplay)
        ret = message('create-template-doc-blurb', {createLink})
            .. '<br>'
    elseif env.subjectSpace == 828 then
        -- /doc does not exist for this module; 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 "Редакторы могут экспериментировать в песочнице этого шаблона (edit | diff) и в тестовых (edit) страницах."
    -- @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' --> 'Редакторы могут экспериментировать в $1 этого модуля и в $2 страницах.'
    -- 'experiment-blurb-template' --> 'Редакторы могут экспериментировать в $1 этого шаблона и в $2 страницах.'
    --]]
    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" then
            local testcasesRunLinkDisplay = message('testcases-run-link-display')
            local testcasesRunLink = makeWikilink(testcasesTitle.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
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