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This module has two functions, portal and image. The portal produces a box with links to a portal or to multiple portals, and is used by the {{portal}} template. It is most often used in the "See also" section of an article. The image function produces the name of the image used by the specified portal.

Portal function

The portal function produces a box of portal links.

Image function

The image function produces the name of the image used by the specified portal.

Usage

{{#invoke:Portal|image|portal}}

Example

• {{#invoke:Portal|image|Art}}

Image dupes function

The image dupes function returns a list of all images that are being used by more than one portal (aliases are not included). This can be helpful in identifying image entries that should be changed to use aliases. 配图：Module:Portal/images

Display all function

The display all function returns a box containing all portals that have images. This is used for maintenance, and should not be displayed in articles, because a) there are around 1500 portals with images, and displaying 1500 images on one page takes up a lot of server resources, and b) the module has no way to know the correct capitalisation of a portal name, so some links to portals will be broken.

Usage

{{#invoke:Portal|displayAll}}

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--[==[ This module is a Lua implementation of the old {{Portal}} template. As of August 2013 it is used on nearly 5,000,000 articles.
-- Please take care when updating it! It outputs two functions: p.portal, which generates a list of portals, and p.image, which
-- produces the image name for an individual portal.

-- The portal image data is kept in submodules of [[Module:Portal/images]], listed below:
-- [[Module:Portal/images/letter]]		
-- [[Module:Portal/images/chinese]]		
-- [[Module:Portal/images/other]]	- for portal names beginning with any other letters. This includes numbers,
-- 									  letters with diacritics, and letters in non-Latin alphabets.
-- [[Module:Portal/images/aliases]]	- for adding aliases for existing portal names. Use this page for variations
-- 									  in spelling and diacritics, etc., no matter what letter the portal begins with.
--
-- The images data pages are separated by the first letter to reduce server load when images are added, changed, or removed.
-- Previously all the images were on one data page at [[Module:Portal/images]], but this had the disadvantage that all
-- 5,000,000 pages using this module needed to be refreshed every time an image was added or removed.
]==]

local p = {}

local function matchImagePage(s)
	-- Finds the appropriate image subpage given a lower-case
	-- portal name plus the first letter of that portal name.
	if type(s) ~= 'string' or #s < 1 then return end
	local firstLetter = mw.ustring.sub(s, 1, 1)
	local imagePage
	if mw.ustring.find(firstLetter, '^[a-z]') then
		imagePage = 'Module:Portal/images/letter'
	else
		imagePage = 'Module:Portal/images/chinese'
	end
	-- Hey, we have a thing called "other"
	return mw.loadData(imagePage)[s] or
		   mw.loadData('Module:Portal/images/other')[s]
end

local function getAlias(s)
	-- Gets an alias from the image alias data page.
	local aliasData = mw.loadData('Module:Portal/images/aliases')
	return aliasData[s]
end

local function getImageName(s)
	-- Gets the image name and the un-aliased "normal name" for a given portal.
	local default = 'Portal-puzzle.svg|link=|alt='
	if type(s) ~= 'string' or #s < 1 then
		return default
	end
	local sl = mw.ustring.lower(s)
	local sr = s
	local img = matchImagePage(sl)
	if not img then
		sr = getAlias(sl)
		if sr then
			img = matchImagePage(mw.ustring.lower(sr))
		end
		if not img then
			img = default
			sr = s
		end
	end
	return img, sr
end

function p._portal(portals, args)
	-- This function builds the portal box used by the {{portal}} template.
	local root = mw.html.create('div')
		:attr('role', 'navigation')
		:attr('aria-label', 'Portals')
		:addClass('noprint portal plainlist')
		:addClass(args.left and 'tleft' or 'tright')
		:css('margin', args.margin or (args.left == 'yes' and '0.5em 1em 0.5em 0') or '0.5em 0 0.5em 1em')
		:css('border', 'solid #aaa 1px')
		:newline()

	-- If no portals have been specified, display an error and add the page to a tracking category.
	if not portals[1] then
		-- zhwp compat: name={{{1}}}|image={{{image1}}}
		-- no tracking needed as no expensive involved
		if args['name'] ~= nil then
			portals[1] = args['name']
			args['image1'] = args['image']
		else
			root:wikitext('<strong class="error">未指定主题：请至少添加一个主题</strong>[[Category:Portal模版没有使用参数]]')
			return tostring(root)
		end
	end

	-- Start the list. This corresponds to the start of the wikitext table in the old [[Template:Portal]].
	local listroot = root:tag('ul')
		:css('display', 'table')
		:css('box-sizing', 'border-box')
		:css('padding', '0.1em')
		:css('max-width', '175px')
		:css('width', type(args.boxsize) == 'string' and (args.boxsize .. 'px') or nil)
		:css('background', 'var(--background-color-base,#f9f9f9)')
		:css('font-size', '85%')
		:css('line-height', '110%')
		:css('font-weight', 'bold')

    -- zhwp compatibility: check for |2= as |image1
    local compat_image1 = false
    if #portals == 2 and (args['image1'] == nil) then
    	local file = portals[2]
    	local parts = mw.text.split(file, '%.')
    	if #parts > 1 then
	    	local ext = (parts[#parts]):lower()
	    	-- likely
	    	if #ext == 3 or #ext == 4 then
	    		local assume_img = (ext == 'png') or (ext == 'jpg') or (ext == 'svg')
	    		-- expensive, hence pre-checks & assumption
	    		if assume_img or mw.title.new(file, 'Media').exists then
		    		args['image1'] = portals[2]
		    		compat_image1 = true
		    		table.remove(portals, 2)
	    		end
			end
		end
	end

	-- Display the portals specified in the positional arguments.
	for i, portal in ipairs(portals) do
		-- Support |image1= |image2= ...
		-- Rationale: [[Template:WPBannerMeta]] usage.
		local image = ''
		if args['image' .. tostring(i)] ~= nil then
			image = args['image' .. tostring(i)] .. '|alt=' .. portal
		else
			-- get the alias too
			image, portal = getImageName(portal)
		end

		-- Generate the html for the image and the portal name.
		listroot
			:newline()
			:tag('li')
				:css('display', 'table-row')
				:tag('span')
					:css('display', 'table-cell')
					:css('padding', '0.2em')
					:css('vertical-align', 'middle')
					:css('text-align', 'center')
					:wikitext(string.format('[[File:%s|32x28px|class=noviewer]]', image))
					:done()
				:tag('span')
					:css('display', 'table-cell')
					:css('padding', '0.2em 0.2em 0.2em 0.3em')
					:css('vertical-align', 'middle')
					:wikitext(string.format('[[Portal:%s|%s主题]]', portal, portal))
	end
	local ret = tostring(root)
	if compat_image1 == true then
		ret = ret .. '[[Category:使用2號參數傳遞Portal模板圖像的頁面]]'
	end
	return ret
end

function p._image(portals)
	-- Wrapper function to allow getImageName() to be accessed through #invoke.
	local name = getImageName(portals[1])
	return name:match('^(.-)|') or name -- FIXME: use a more elegant way to separate borders etc. from the image name
end

local function getAllImageTables()
	-- Returns an array containing all image subpages (minus aliases) as loaded by mw.loadData.
	local images = {}
	for i, subpage in ipairs{'letter', 'chinese', 'other'} do
		images[i] = mw.loadData('Module:Portal/images/' .. subpage)
	end
	return images
end

function p._displayAll(portals, args)
	-- This function displays all portals that have portal images. This function is for maintenance purposes and should not be used in
	-- articles, for two reasons: 1) there are over 1500 portals with portal images, and 2) the module doesn't record how the portal
	-- names are capitalized, so the portal links may be broken.
	local lang = mw.language.getContentLanguage()
	local count = 1
	for _, imageTable in ipairs(getAllImageTables()) do
		for portal in pairs(imageTable) do
			portals[count] = lang:ucfirst(portal)
			count = count + 1
		end
	end
	return p._portal(portals, args)
end

function p._imageDupes()
	-- This function searches the image subpages to find duplicate images. If duplicate images exist, it is not necessarily a bad thing,
	-- as different portals might just happen to choose the same image. However, this function is helpful in identifying images that
	-- should be moved to a portal alias for ease of maintenance.
	local exists, dupes = {}, {}
	for _, imageTable in ipairs(getAllImageTables()) do
		for portal, image in pairs(imageTable) do
			if not exists[image] then
				exists[image] = portal
			else
				table.insert(dupes, string.format('The image "[[:File:%s|%s]]" is used for both portals "%s" and "%s".', image, image, exists[image], portal))
			end
		end
	end
	if #dupes < 1 then
		return 'No duplicate images found.'
	else
		return 'The following duplicate images were found:\n* ' .. table.concat(dupes, '\n* ')
	end
end

local function processPortalArgs(args)
	-- This function processes a table of arguments and returns two tables: an array of portal names for processing by ipairs, and a table of
	-- the named arguments that specify style options, etc. We need to use ipairs because we want to list all the portals in the order
	-- they were passed to the template, but we also want to be able to deal with positional arguments passed explicitly, for example
	-- {{portal|2=Politics}}. The behaviour of ipairs is undefined if nil values are present, so we need to make sure they are all removed.
	args = type(args) == 'table' and args or {}
	local portals = {}
	local namedArgs = {}
	for k, v in pairs(args) do
		if type(k) == 'number' and type(v) == 'string' then -- Make sure we have no non-string portal names.
			table.insert(portals, k)
		elseif type(k) ~= 'number' then
			namedArgs[k] = v
		end
	end
	table.sort(portals)
	for i, v in ipairs(portals) do
		portals[i] = args[v]
	end
	return portals, namedArgs
end

local function makeWrapper(funcName)
	-- Processes external arguments and sends them to the other functions.
	return function (frame)
		-- If called via #invoke, use the args passed into the invoking
		-- template, or the args passed to #invoke if any exist. Otherwise
		-- assume args are being passed directly in from the debug console
		-- or from another Lua module.
		local origArgs
		if type(frame.getParent) == 'function' then
			origArgs = frame:getParent().args
			for k, v in pairs(frame.args) do
				origArgs = frame.args
				break
			end
		else
			origArgs = frame
		end
		-- Trim whitespace and remove blank arguments.
		local args = {}
		for k, v in pairs(origArgs) do
			if type(v) == 'string' then
				v = mw.text.trim(v)
			end
			if v ~= '' then
				args[k] = v
			end
		end
		return p[funcName](processPortalArgs(args)) -- passes two tables to func: an array of portal names, and a table of named arguments.
	end
end

for _, funcName in ipairs{'portal', 'image', 'imageDupes', 'displayAll'} do
	p[funcName] = makeWrapper('_' .. funcName)
end

return p