--[==[ This module is a Lua implementation of the old {{Portal}} template. As of February 2019 it is used on nearly 7,900,000 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/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 p = {}
-- determine whether we're being called from a sandbox
local isSandbox = mw.getCurrentFrame():getTitle():find('sandbox', 1, true)
local sandbox = isSandbox and '/sandbox' or ''
local function sandboxVersion(s)
return isSandbox and s..'-sand' or s
end
local templatestyles = 'Module:Portal'..sandbox..'/styles.css'
local getArgs = require('Module:Arguments').getArgs
local yesno = require('Module:Yesno')
-- List of non-talk namespaces which should not be tracked (Talk pages are never tracked)
local badNamespaces = {'user','template','draft','wikipedia'}
-- Check whether to do tracking in this namespace
-- Returns true unless the page is one of the banned namespaces
local function checkTracking(title)
local thisPage = title or mw.title.getCurrentTitle()
if thisPage.isTalkPage then
return false
end
local ns = thisPage.nsText:lower()
for _, v in ipairs(badNamespaces) do
if ns == v then
return false
end
end
return true
end
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 .. sandbox
else
imagePage = 'Module:Portal/images/other' .. sandbox
end
return mw.loadData(imagePage)[s]
end
local function getAlias(s)
-- Gets an alias from the image alias data page.
local aliasData = mw.loadData('Module:Portal/images/aliases'..sandbox)
for portal, aliases in pairs(aliasData) do
for _, alias in ipairs(aliases) do
if alias == s then
return portal
end
end
end
end
local defaultImage = 'Portal-puzzle.svg|link=|alt='
local function getImageName(s)
-- Gets the image name for a given string.
if type(s) ~= 'string' or #s < 1 then
return defaultImage
end
s = mw.ustring.lower(s)
return matchImagePage(s) or matchImagePage(getAlias(s)) or defaultImage
end
local function exists(title)
local success, exists = pcall(function() return title.exists end)
-- If success = false, then we're out of expensive parser function calls and can't check whether it exists
-- in that case, don't throw a Lua error
return not success or exists
end
-- Function to check argument portals for errors, generate tracking categories if needed
-- Function first checks for too few/many portals provided
-- Then checks the portal list to purge any portals that don't exist
-- Arguments:
-- portals: raw list of portals
-- args.tracking: is tracking requested? (will not track on bad titles or namespaces)
-- args.redlinks: should redlinks be displayed?
-- args.minPortals: minimum number of portal arguments
-- args.maxPortals: maximum number of portal arguments
-- Returns:
-- portals = list of portals, with redlinks purged (if args.redlinks=false)
-- trackingCat = possible tracking category
-- errorMsg = error message
function p._checkPortals(portals, args)
local trackingCat = ''
local errMsg = nil
-- Tracking is on by default.
-- It is disabled if any of the following is true
-- 1/ the parameter "tracking" is set to 'no, 'n', or 'false'
-- 2/ the current page fails the namespace or pagename tests
local trackingEnabled = args.tracking and checkTracking()
args.minPortals = args.minPortals or 1
args.maxPortals = args.maxPortals or -1
-- check for too few portals
if #portals < args.minPortals then
errMsg = 'please specify at least '..args.minPortals..' portal'..(args.minPortals > 1 and 's' or '')
trackingCat = (trackingEnabled and '[[Category:Portal templates with too few portals]]' or '')
return portals, trackingCat, errMsg
end
-- check for too many portals
if args.maxPortals >= 0 and #portals > args.maxPortals then
errMsg = 'too many portals (maximum = '..args.maxPortals..')'
trackingCat = (trackingEnabled and '[[Category:Portal templates with too many portals]]' or '')
return portals, trackingCat, errMsg
end
if not args.redlinks or trackingEnabled then
-- make new list of portals that exist
local existingPortals = {}
for _, portal in ipairs(portals) do
local portalTitle = mw.title.new(portal,"Portal")
-- if portal exists, put it into list
if portalTitle and exists(portalTitle) then
table.insert(existingPortals,portal)
-- otherwise set tracking cat
elseif trackingEnabled then
trackingCat = "[[Category:Portal templates with redlinked portals]]"
end
end
-- If redlinks is off, use portal list purged of redlinks
portals = args.redlinks and portals or existingPortals
-- if nothing left after purge, set tracking cat
if #portals == 0 and trackingEnabled then
trackingCat = trackingCat.."[[Category:Pages with empty portal template]]"
end
end
return portals, trackingCat, errMsg
end
local function portalBox(args)
return mw.html.create('ul')
:attr('role', 'navigation')
:attr('aria-label', 'Portals')
:addClass('noprint')
:addClass(args.error and '' or sandboxVersion('portalbox'))
:addClass(args.border and sandboxVersion('portalborder') or '')
:addClass(sandboxVersion(args.left and 'portalleft' or 'portalright'))
:css('margin', args.margin or nil)
:newline()
end
local function fillBox(root, contents)
for _, item in ipairs(contents) do
local entry = root:tag('li')
entry:addClass(sandboxVersion('portalbox-entry'))
local image = entry:tag('span')
image:addClass(sandboxVersion('portalbox-image'))
image:wikitext(item[1])
local link = entry:tag('span')
link:addClass(sandboxVersion('portalbox-link'))
link:wikitext(item[2])
end
return root
end
function p._portal(portals, args)
-- This function builds the portal box used by the {{portal}} template.
-- Normalize all arguments
if args.redlinks == 'include' then args.redlinks = true end
args.addBreak = args['break']
for key, default in pairs({left=false,tracking=true,nominimum=false,
redlinks=false,addBreak=false,border=true}) do
if args[key] == nil then args[key] = default end
args[key] = yesno(args[key], default)
end
local root = portalBox(args)
local trackingCat = ''
local errMsg = nil
args.minPortals = args.nominimum and 0 or 1
args.maxPortals = -1
portals, trackingCat, errMsg = p._checkPortals(portals, args)
root:wikitext(trackingCat)
-- if error message, put it in the box and return
if errMsg then
if args.border then -- suppress error message when border=no
args.error = true -- recreate box without fancy formatting
root = portalBox(args)
root:wikitext(trackingCat)
local errTag = root:tag('strong')
errTag:addClass('error')
errTag:css('padding','0.2em')
errTag:wikitext('Error: '..errMsg)
end
return tostring(root)
end
-- if no portals (and no error), just return tracking category
if #portals == 0 then
return trackingCat
end
local contents = {}
-- Display the portals specified in the positional arguments.
local defaultUsed = nil
for _, portal in ipairs(portals) do
local portalImage = getImageName(portal)
if portalImage == defaultImage then
defaultUsed = portal
end
local image = string.format('[[File:%s|32x28px|class=noviewer]]',
portalImage)
local link = string.format('[[Portal:%s|%s%sportal]]',
portal, portal, args.addBreak and '<br />' or ' ')
table.insert(contents, {image, link})
end
if defaultUsed and checkTracking() then
local cat = string.format('[[Category:Portal templates with default image|%s]]',
defaultUsed)
root:wikitext(cat)
end
return tostring(fillBox(root, contents))
end
function p._demo(imageList, args)
for key, default in pairs({left=false,border=true}) do
if args[key] == nil then args[key] = default end
args[key] = yesno(args[key], default)
end
local root = portalBox(args)
local contents = {}
-- Display the portals specified in the positional arguments.
for _, fn in ipairs(imageList) do
local image = string.format('[[File:%s|32x28px|class=noviewer]]',fn)
local link = string.format('[[:File:%s|%s]]',fn,fn)
table.insert(contents,{image,link})
end
return tostring(fillBox(root,contents))
end
function p._image(portal,keep)
-- Wrapper function to allow getImageName() to be accessed through #invoke.
-- backward compatibility: if table passed, take first element
if type(portal) == 'table' then
portal = portal[1]
end
local name = getImageName(portal)
-- If keep is yes (or equivalent), then allow all metadata (like image borders) to be returned
local keepargs = yesno(keep)
local args = mw.text.split(name, "|", true)
local result = {args[1]} -- the filename always comes first
local category = ''
-- parse name, looking for category arguments
for i = 2,#args do
local m = mw.ustring.match(args[i], "^%s*category%s*=")
if keepargs or m then
table.insert(result, args[i])
end
end
-- reassemble arguments
return table.concat(result,"|")
end
local function getAllImageTable()
-- Returns an array containing all image subpages (minus aliases) as loaded by mw.loadData.
local images = {}
for i, subpage in ipairs{'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'} do
local imageTable = mw.loadData('Module:Portal/images/' .. subpage .. sandbox)
for portal, image in pairs(imageTable) do
local args = mw.text.split(image,"|")
images[portal] = args[1] -- just use image filename
end
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()
portals = portals or {}
for portal in pairs(getAllImageTable()) do
table.insert(portals,lang:ucfirst(portal))
end
table.sort(portals)
args.redlinks = args.redlinks or "yes"
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 portal, image in pairs(getAllImageTable()) 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
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
-- Entry point for sorting portals from other named arguments
function p._processPortalArgs(args)
return processPortalArgs(args)
end
function p.image(frame)
local origArgs = getArgs(frame)
local portals, args = processPortalArgs(origArgs)
return p._image(portals[1],args.border)
end
function p.demo(frame)
local args = getArgs(frame)
local styles = frame:extensionTag{ name = 'templatestyles', args = { src = templatestyles} }
return styles..p._demo(args,args)
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.
-- Also: trim whitespace and remove blank arguments
local origArgs = getArgs(frame)
-- create two tables to pass to func: an array of portal names, and a table of named arguments.
local portals, args = processPortalArgs(origArgs)
local results = ''
if funcName == '_portal' or funcName == '_displayAll' then
results = frame:extensionTag{ name = 'templatestyles', args = { src = templatestyles} }
end
return results .. p[funcName](portals, args)
end
end
for _, funcName in ipairs{'portal', 'imageDupes', 'displayAll'} do
p[funcName] = makeWrapper('_' .. funcName)
end
return p
