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--[==[ 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 = {}

local trackingEnabled = true

local templatestyles = 'Module:Portal/styles.css'

local yesno = require('Module:Yesno')

-- Check whether to do tracking in this namespace
-- Returns true unless the page is one of the banned namespaces
local function checkTrackingNamespace()
local thisPage = mw.title.getCurrentTitle()
if (thisPage.namespace == 1) -- Talk
or (thisPage.namespace == 2) -- User
or (thisPage.namespace == 3) -- User talk
or (thisPage.namespace == 5) -- Wikipedia talk
or (thisPage.namespace == 7) -- File talk
or (thisPage.namespace == 11) -- Template talk
or (thisPage.namespace == 15) -- Category talk
or (thisPage.namespace == 101) -- Portal talk
or (thisPage.namespace == 109) -- Book talk
or (thisPage.namespace == 118) -- Draft
or (thisPage.namespace == 119) -- Draft talk
or (thisPage.namespace == 829) -- Module talk
then
return false
end
return true
end

-- Check whether to do tracking on this pagename
-- Returns false if the page title matches one of the banned strings
-- Otherwise returns true
local function checkTrackingPagename()
local thisPage = mw.title.getCurrentTitle()
local thisPageLC = mw.ustring.lower(thisPage.text)
if (string.match(thisPageLC, "/archive") ~= nil) then
return false
end
if (string.match(thisPageLC, "/doc") ~= nil) then
return false
end
if (string.match(thisPageLC, "/test") ~= nil) then
return false
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
else
imagePage = 'Module:Portal/images/other'
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')
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.
local default = 'Portal-puzzle.svg|link=|alt='
if type(s) ~= 'string' or #s < 1 then
return default
end
s = mw.ustring.lower(s)
return matchImagePage(s) or matchImagePage(getAlias(s)) or default
end

local function checkPortalExists(portal)
return not (mw.title.makeTitle(100, portal).id == 0)
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 nil)
:newline()

-- 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 tests in checkTrackingNamespace()
-- 3/ the current page fails the pagename tests in checkTrackingPagename()
trackingEnabled = yesno(args.tracking, trackingEnabled)
if (checkTrackingNamespace() == false) then
trackingEnabled = false
end
if (checkTrackingPagename() == false) then
trackingEnabled = false
end

-- If no portals have been specified, display an error and add the page to a tracking category.
if not portals[1] then
if yesno(args.nominimum) then
-- if nominimum as been set to yes (or similar), omit the warning

else
root:wikitext('<strong class="error">No portals specified: please specify at least one portal</strong>')
end
if (trackingEnabled) then
root:wikitext('[[Category:Portal templates without a parameter]]')
end
return tostring(root)
end

-- scan for nonexistent portals, if they exist remove them from the portals table. If redlinks=yes, then don't remove
local portallen = #portals
-- traverse the list backwards to ensure that no portals are missed (table.remove also moves down the portals in the list, so that the next portal isn't checked if going fowards.
-- going backwards allows us to circumvent this issue
for i=portallen,1,-1 do
-- the use of pcall here catches any errors that may occour when attempting to locate pages when the page name is invalid
-- if pcall returns true, then rerun the function to find if the page exists
if not pcall(checkPortalExists, portals[i]) or not checkPortalExists(portals[i]) then
-- Getting here means a redlinked portal has been found
if yesno(args.redlinks) or (args.redlinks == 'include') then
-- if redlinks as been set to yes (or similar), add the cleanup category and then break the loop before the portal is removed from the list
if (trackingEnabled) then
root:wikitext('[[Category:Portal templates with redlinked portals]]')
end
break
end
-- remove the portal (this does not happen if redlinks=yes)
table.remove(portals,i)
end
end

-- if the length of the table is different, then rows were removed from the table, so portals were removed. If this is the case add the cleanup category
if not (portallen == #portals) then
if (trackingEnabled) then
if #portals == 0 then
return '[[Category:Portal templates with all redlinked portals]]'
else
root:wikitext('[[Category:Portal templates with redlinked portals]]')
end
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('width', type(args.boxsize) == 'string' and (args.boxsize .. 'px') or nil)

-- Display the portals specified in the positional arguments.
for _, portal in ipairs(portals) do
local image = getImageName(portal)

-- Generate the html for the image and the portal name.
listroot
:newline()
:tag('li')
:tag('span')
:wikitext(string.format('[[File:%s|32x28px|class=noviewer]]', image))
:done()
:tag('span')
:wikitext(string.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.
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{'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
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

local results = ''
if funcName == '_portal' or funcName == '_displayAll' then
results = frame:extensionTag{ name = 'templatestyles', args = { src = templatestyles} }
end
return results .. 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

Module:Portal - Revision history

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