Module:Portal
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 | This Lua module is used on approximately 9,660,000 pages, or roughly 143686% of all pages. To avoid major disruption and server load, any changes should be tested in the module's /sandbox or /testcases subpages, or in your own module sandbox. The tested changes can be added to this page in a single edit. Consider discussing changes on the talk page before implementing them. |
Lua error in Module:TNT at line 167: Missing Commons dataset I18n/Module:TNT.tab.
 | This module is subject to page protection. It is a highly visible module in use by a very large number of pages, or is substituted very frequently. Because vandalism or mistakes would affect many pages, and even trivial editing might cause substantial load on the servers, it is protected from editing. |
This module has two functions, portal and image. The portal produces a box with links to a portal or to multiple portals, and is used by the {{portal}} template. It is most often used in the "See also" section of an article. The image function produces the name of the image used by the specified portal.
Portal function
The portal function produces a box of portal links.
Usage
Basic usage
{{#invoke:Portal|portal |Portal 1 |Portal 2 |Portal 3 |... }}
All options
{{#invoke:Portal|portal
| Portal 1
| Portal 2
| Portal 3
| ...
| left =
| margin =
| break =
| boxsize =
| redlinks =
}}
Location
Within articles, the output of the portal function is meant to be placed at the top of the article's See also section. If there is no See also section, you may put it in the External links section instead; there is no need to create a new section just to house this template. If there is no External links section either, just put it below the article text in the place that seems most appropriate.
There are no particular rules about the placement of portals on other kinds of pages.
Image
The portal image names are stored in subpages of Module:Portal/images, organised by the first letter of the portal name. For example, the first letter of Portal:Feminism is "F", so the image name is stored at Module:Portal/images/f. If there is an entry for a portal on the correct page then the corresponding image will be shown next to the portal link. If no image is found then File:Portal-puzzle.svg will be shown instead.
It is also possible to specify aliases for portal images. For example, the code {{Portal|Detroit}} produces the same image as the code {{Portal|Metro Detroit}}. The "Detroit" alias is found on the page Module:Portal/images/aliases.
The image-detection algorithm is case-insensitive. For example, the code {{Portal|Detroit}} will produce the same image as the code {{Portal|detroit}} (although the portal links will be different). Portal names are stored in lower case in the image subpages, and input is converted to lower case before being checked.
To add new images to the list, please make a protected edit request at Template talk:Portal to get an administrator to edit the correct subpage for you. Portal images must be either in the public domain or available under a free license that allows commercial reuse and derivative works; fair-use images are not acceptable. The template {{Portal icon demonstration}} may be of use when deciding whether an image is suitable for use as a portal icon; it formats an image using the same size and style that the {{Portal}} template uses by default.
A list of portals and aliases of portals without icons can be found at User:Dreamy Jazz Bot/Portals needing icons. It is updated infrequently, so ping the bot owner to update the list.
List of image subpages
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Example
| Code | Result |
|---|---|
{{#invoke:Portal|portal|Science}}
|
Parameters
| Name | Value | Description |
|---|---|---|
1, 2, 3 ... |
The portal name, e.g. Literature |
The positional parameters specify the portals to be displayed. |
left |
yes |
If set to yes, the portal appears on the left side of the page instead of the right.
|
margin |
CSS margin value, e.g. 1.2em 3em 0.5em 1em |
This allows you to set a custom margin. All valid CSS margin values are accepted. |
break |
yes |
If set to yes, a line break is inserted after the portal name and before the word portal.
|
boxsize |
Size in pixels, e.g. 300 |
This sets a custom box width in pixels. |
redlinks |
Any of the following values: yes, y, true, or include |
Redlinks will be displayed. The default is to suppress redlinks. |
nominimum |
Any of the following values: yes, y, or true |
Suppresses the warning if no parameters are supplied. This can be useful when Template:Portal is called by another template. |
tracking |
Any of the following values: no, n, false |
Tracking categories will be suppressed. The default is to use tracking categories, except on certain namespaces and on pagenames which contain "/archive", "/doc" or "/test". |
Error tracking
If the module is used incorrectly, the page will be added to a tracking category.
The tracking categories are not applied if any of the following is true:
- Tracking is specially disabled for that usage. This is done by setting the optional parameter
|tracking=to any the following values:no,n,false - the template is used on a page in any of these namespaces: Talk, User, User talk, Wikipedia talk, File talk, Template talk, Category talk, Portal talk, Draft, Draft talk, Module talk
- The title page on which the template is used includes any of the following case-insensitive strings: "/archive", "/doc", "/test"
- Category:Portal templates without a parameter — (population 0)
- Category:Portal templates with redlinked portals — (population 11)
- Category:Portal templates with all redlinked portals — (population 4)
Image function
The image function produces the name of the image used by the specified portal.
Usage
{{#invoke:Portal|image|portal}}
Example
{{#invoke:Portal|image|Art}}→ Lua error in package.lua at line 80: module 'Module:Portal/images/a' not found.
Image dupes function
The image dupes function returns a list of all images that are being used by more than one portal (aliases are not included). This can be helpful in identifying image entries that should be changed to use aliases.
Usage
{{#invoke:Portal|imageDupes}}
Display all function
The display all function returns a box containing all portals that have images. This is used for maintenance, and should not be displayed in articles, because a) there are around 1500 portals with images, and displaying 1500 images on one page takes up a lot of server resources, and b) the module has no way to know the correct capitalisation of a portal name, so some links to portals will be broken. This function can be seen at Template:Portal/doc/all.
Usage
{{#invoke:Portal|displayAll}}
--[==[ 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 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 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 (args.left == 'yes' and '0.5em 1em 0.5em 0') or '0.5em 0 0.5em 1em')
:css('border', 'solid #aaa 1px')
:newline()
-- If no portals have been specified, display an error and add the page to a tracking category.
if not portals[1] then
root:wikitext('<strong class="error">No portals specified: please specify at least one portal</strong>[[Category:Portal templates without a parameter]]')
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 (args.redlinks == 'yes') or (args.redlinks == 'y') or (args.redlinks == 'true') 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
root:wikitext('[[Category:Portal templates with redlinked portals]]')
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 #portals == 0 then
return '[[Category:Portal templates with all redlinked portals]]'
end
root:wikitext('[[Category:Portal templates with redlinked portals]]')
end
-- Start the list. This corresponds to the start of the wikitext table in the old [[Template:Portal]].
local listroot = root:tag('ul')
:css('display', 'table')
:css('box-sizing', 'border-box')
:css('padding', '0.1em')
:css('max-width', '175px')
:css('width', type(args.boxsize) == 'string' and (args.boxsize .. 'px') or nil)
:css('background', '#f9f9f9')
:css('font-size', '85%')
:css('line-height', '110%')
:css('font-style', 'italic')
:css('font-weight', 'bold')
-- 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')
:css('display', 'table-row')
:tag('span')
:css('display', 'table-cell')
:css('padding', '0.2em')
:css('vertical-align', 'middle')
:css('text-align', 'center')
:wikitext(string.format('[[File:%s|32x28px|class=noviewer]]', image))
:done()
:tag('span')
:css('display', 'table-cell')
:css('padding', '0.2em 0.2em 0.2em 0.3em')
:css('vertical-align', 'middle')
: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
return 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
