if #portals == 0 then
return ''
else
root:wikitext('')
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('', image))
:done
:tag('span')
:wikitext(string.format('%s%sவலைவாசல்', portal, portal, args['break'] and '
' 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 "" 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
-- . 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
-- 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(.getParent) == 'function' then
origArgs = :getParent.args
for k, v in pairs(.args) do
origArgs = .args
break
end
else
origArgs =
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 = :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