--[==[ 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.right and 'tright' or 'tleft') 		.addClass('portal') 		.css('border', 'solid #aaa 1px') 		.css('margin', args.margin or (args.right == 'yes' and '0.5em 0 0.5em 1em') or '0.5em 1em 0.5em 0') 		.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">هیچ درگاهی تعیین نشده‌است: لطفاً دست کم یک درگاه تعیین کنید</strong>[[رده:الگو:درگاه بدون پارامتر]]') 	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=نشان درگاه]]', 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('[[درگاه:%s|درگاه %s%s]]', 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('تصویر «[[:File:%s|%s]]» برای دو درگاه «%s» و «%s» استفاده شده‌است.', image, image, exists[image], portal)) 			end 		end 	end 	if #dupes < 1 then 		return 'تصاویر یکسان یافت نشد.' 	else 		return 'تصاویر یکسان روبرو یافت شد:\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