View source for Module:Portal

--[==[ 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 table 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/a]]       - for portal names beginning with "A".
-- [[Module:Portal/images/b]]       - for portal names beginning with "B".
-- [[Module:Portal/images/c]]       - for portal names beginning with "C".
-- [[Module:Portal/images/d]]       - for portal names beginning with "D".
-- [[Module:Portal/images/e]]       - for portal names beginning with "E".
-- [[Module:Portal/images/f]]       - for portal names beginning with "F".
-- [[Module:Portal/images/g]]       - for portal names beginning with "G".
-- [[Module:Portal/images/h]]       - for portal names beginning with "H".
-- [[Module:Portal/images/i]]       - for portal names beginning with "I".
-- [[Module:Portal/images/j]]       - for portal names beginning with "J".
-- [[Module:Portal/images/k]]       - for portal names beginning with "K".
-- [[Module:Portal/images/l]]       - for portal names beginning with "L".
-- [[Module:Portal/images/m]]       - for portal names beginning with "M".
-- [[Module:Portal/images/n]]       - for portal names beginning with "N".
-- [[Module:Portal/images/o]]       - for portal names beginning with "O".
-- [[Module:Portal/images/p]]       - for portal names beginning with "P".
-- [[Module:Portal/images/q]]       - for portal names beginning with "Q".
-- [[Module:Portal/images/r]]       - for portal names beginning with "R".
-- [[Module:Portal/images/s]]       - for portal names beginning with "S".
-- [[Module:Portal/images/t]]       - for portal names beginning with "T".
-- [[Module:Portal/images/u]]       - for portal names beginning with "U".
-- [[Module:Portal/images/v]]       - for portal names beginning with "V".
-- [[Module:Portal/images/w]]       - for portal names beginning with "W".
-- [[Module:Portal/images/x]]       - for portal names beginning with "X".
-- [[Module:Portal/images/y]]       - for portal names beginning with "Y".
-- [[Module:Portal/images/z]]       - for portal names beginning with "Z".
-- [[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 htmlBuilder = require('Module:HtmlBuilder')

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/' .. firstLetter
	else
		imagePage= 'Module:Portal/images/other'
	end
	local images = mw.loadData(imagePage)
	local image = images[s]
	if image then
		return image
	end
end

local function getAlias(s)
	-- Gets an alias from the image alias data page.
	local aliasData = mw.loadData('Module:Portal/images/aliases')
	for portal, aliases in pairs(aliasData) do
		for _, alias in ipairs(aliases) do
			if alias == s then
				return portal
			end
		end
	end
end

local function getImageName(s)
	-- Gets the image name for a given string.
	if type(s) ~= 'string' or #s < 1 then
		return 'Portal-puzzle.svg'
	end
	s = mw.ustring.lower(s)
	local image = matchImagePage(s)
	if image then
		return image
	else
		local alias = getAlias(s)
		image = matchImagePage(alias) -- If no alias was found this returns nil.
		if image then
			return image
		else
			return 'Portal-puzzle.svg'
		end
	end
end

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

	-- Start the table. This corresponds to the start of the wikitext table in the old [[Template:Portal]].
	local tableroot = root.tag('table')
		.css('background', '#f9f9f9')
		.css('font-size', '85%')
		.css('line-height', '110%')
		.css('max-width', '175px')
		.css('width', type(args.boxsize) == 'string' and (args.boxsize .. 'px'))
	
	-- If no portals have been specified, display an error and add the page to a tracking category.
	if not portals[1] then
		tableroot.wikitext('<strong class="error">No portals specified: please specify at least one portal</strong>[[Category:Portal templates without a parameter]]')
	end

	-- Display the portals specified in the positional arguments.
	for i, portal in ipairs(portals) do
		local image = getImageName(portal)
		
		-- Generate the html for the image and the portal name.
		tableroot
			.newline()
			.tag('tr')
				.attr('valign', 'middle')
				.tag('td')
					.css('text-align', 'center')
					.wikitext(mw.ustring.format('[[File:%s|32x28px|alt=Portal icon]]', image))
					.done()
				.tag('td')
					.css('padding', '0 0.2em')
					.css('vertical-align', 'middle')
					.css('font-style', 'italic')
					.css('font-weight', 'bold')
					.wikitext(mw.ustring.format('[[Portal:%s|%s%sportal]]', portal, portal, args['break'] and '<br />' or ' '))
	end
	return tostring(root)
end

function p._image(portals)

	-- Wrapper function to allow getImageName() to be accessed through #invoke.
	return getImageName(portals[1])
end

local function getAllImageTables()
	-- Returns an array containing all image subpages (minus aliases) as loaded by mw.loadData.
	local images = {}
	local subpages = {'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 'other'}
	for i, subpage in ipairs(subpages) do
		table.insert(images, 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 images = getAllImageTables()
	local count = 1
	for i, imageTable in ipairs(images) 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 = {}, {}
	local images = getAllImageTables()
	for i, imageTable in ipairs(images) do
		for portal, image in pairs(imageTable) do
			if not exists[image] then
				exists[image] = portal
			else
				table.insert(dupes, mw.ustring.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 frame == mw.getCurrentFrame() 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

local funcNames = {'portal', 'image', 'imageDupes', 'displayAll'}

for _, funcName in ipairs(funcNames) do
	p[funcName] = makeWrapper('_' .. funcName)
end

return p