模組:Portal

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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.

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}}

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. 配图：Module:Portal/images

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.

Usage

{{#invoke:Portal|displayAll}}

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--[==[ 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' )

-- Finds the appropriate image subpage given a lower-case
-- portal name plus the first letter of that portal name.
local function matchImagePage( s )
    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

-- Gets the image name for a given string.
local function getImageName( s )
    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 aliases = mw.loadData( 'Module:Portal/images/aliases' )
        local alias = aliases[ s ]
        image = matchImagePage( alias )
        if image then
            return image
        else
            return 'Portal-puzzle.svg'
        end
    end
end

-- This function builds the portal box used by the {{portal}} template.
local function _portal( portals, args )
    local root = htmlBuilder.create( 'div' )
    root
        .addClass( 'noprint' )
        .addClass( args.left and 'tleft' or 'tright' )
        .addClass( 'portal' )
        .css( 'border', 'solid #aaa 1px' )
        .css( 'margin', args.margin or ( args.left == 'yes' and '0.5em 1em 0.5em 0' ) or '0.5em 0 0.5em 1em')
        .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">No portals specified: please specify at least one portal</strong>[[Category:Portal templates without a parameter]]' )
    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=Portal icon]]', 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( '[[Portal:%s|%s%sportal]]', portal, portal, args[ 'break' ] and '<br />' or ' ' ) )
    end
    return tostring( root )
end

-- Wrapper function to allow getImageName() to be accessed through #invoke.
local function _image( portals )
    return getImageName( portals[ 1 ] )
end

-- Returns an array containing all image subpages (minus aliases) as loaded by mw.loadData.
local function getAllImageTables()
    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

-- 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 function _displayAll( portals, args )
    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 _portal( portals, args )
end

-- 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 function _findImageDupes()
    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( '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
	
-- 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.
local function processPortalArgs( args )
    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

-- Processes external arguments and sends them to the other functions.
local function makeWrapper( func )
    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 func( processPortalArgs( args ) ) -- passes two tables to func: an array of portal names, and a table of named arguments.
    end
end

return {
    portal = makeWrapper( _portal ),
    image = makeWrapper( _image ),
    imageDupes = makeWrapper( _findImageDupes ),
    displayAll = makeWrapper( _displayAll )
}