Module:Random slideshow

Module documentation[view] [edit] [history] [purge]

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 template contains coding that is not compatible with mobile versions of Wikipedia, causing display and accessibility problems. Read the documentation for an explanation.

This module depends on the following other modules:

This module uses TemplateStyles:

Module:Random slideshow/styles.css (sandbox)

Usage

{{#invoke:Random slideshow|main}}: See {{Random slideshow}} for details.
{{#invoke:Random slideshow|transclude}}: See {{Transclude files as random slideshow}} for details.

This module is also used by Module:Excerpt slideshow.

Display in the mobile view

On mobile devices, a standard gallery is displayed instead of the slideshow. If the screen width is less than 720px, only the first four images after randomisation are visible (example screenshot). For mobile devices with larger resolutions, all images are displayed (example screenshot). For some tables, it displays all images stacked (example screenshot).

Testcases

The following testcase pages are available for testing changes made to this module's sandbox:

The above documentation is transcluded from Module:Random slideshow/doc.
Editors can experiment in this module's sandbox and testcases pages.
Subpages of this module.

-- Creates a slideshow gallery where the order is randomised. Intended for use on portal pages.
local p = {}
local excerptModule =  require('Module:Excerpt/portals')
local randomModule = require('Module:Random')

function cleanupArgs(argsTable)
	local cleanArgs = {}
	for key, val in pairs(argsTable) do
		if type(val) == 'string' then
			val = val:match('^%s*(.-)%s*$')
			if val ~= '' then
				cleanArgs[key] = val
			end
		else
			cleanArgs[key] = val
		end
	end
	return cleanArgs
end

function normaliseCssMeasurement(input)
	local suffix = string.reverse(string.sub(string.reverse(input), 1, 2))
	if ( suffix == 'px' ) or ( suffix == 'em' ) or ( string.sub(suffix, 2, 2) == '%' ) then
		return input
	else
		return input .. 'px'
	end
end

function isDeclined(val)
	if not val then return false end
	local declinedWords = " decline declined exclude excluded false none not no n off omit omitted remove removed "
	return string.find(declinedWords , ' '..val..' ', 1, true ) and true or false
end

function makeOutput(galleryLines, maxWidth, containerClassName, nonRandom)
	local randomiseArgs = {	['t'] = galleryLines }
	local sortedLines = nonRandom and galleryLines or randomModule.main('array', randomiseArgs)
	for i = 1, #sortedLines do
		-- insert a switcher-label span just after the first pipe, which should ideally be the caption
		sortedLines[i] = sortedLines[i]:gsub(
			"|",
			'|<span class="switcher-label" style="display:none"><span class="randomSlideshow-sr-only">Image ' .. tostring(i) .. '</span></span>',
			1)
	end
	local galleryContent = table.concat(sortedLines, '\n')
	local output = '<div class="' .. containerClassName .. '" style="max-width:' .. normaliseCssMeasurement(maxWidth) .. '; margin:-4em auto;"><div class="nomobile"><!--intentionally empty on desktop, and is not present on mobile website (outside template namesapce)--></div>'
		.. mw.getCurrentFrame():extensionTag({name="gallery",content=galleryContent,args={mode="slideshow",class="switcher-container"}}) .. '</div>'
	return output
end

function makeGalleryLine(file, caption, credit)
	local title = mw.title.new(file, "File" )
	if not title
	then
		return "File:Blank.png|{{Error|File [[:File:" .. file .. "]] does not exist.}}"
	end
	local creditLine = ( credit and '<p><span style="font-size:88%">' .. credit .. '</span></p>' or '' )
	return title.prefixedText .. '|' .. ( caption or '' ) .. creditLine
end

function makeGalleryLinesTable(args)
	local galleryLinesTable = {}
	local i = 1
	while args[i] do
		table.insert(galleryLinesTable, makeGalleryLine(args[i], args[i+1], args['credit' .. (i+1)/2]))
		i = i + 2
	end
	return galleryLinesTable 
end

function hasCaption(line)
	local caption = mw.ustring.match(line, ".-|(.*)")
	-- require caption to exist with more than 5 characters (avoids sizes etc being mistaken for captions)
	return caption and #caption>5 and true or false
end

function extractGalleryFiles(wikitext)
	local gallery = mw.ustring.match(wikitext, '<gallery.->%s*(.-)%s*</gallery>')
	if not gallery then
		return false
	end
	return mw.text.split(gallery, '%c')
end

function extractRegularFiles(wikitext)
	local files = {}
	local frame = mw.getCurrentFrame()
	local expand = function(template)
		return frame:preprocess(template)
	end
	for file in mw.ustring.gmatch(wikitext, '%b[]' ) do
		-- remove keywords that don't work in galleries
		file = mw.ustring.gsub(file, '|%s*thumb%s*([|%]])', '%1')
		file = mw.ustring.gsub(file, '|%s*thumbnail%s*([|%]])', '%1')
		file = mw.ustring.gsub(file, '|%s*border%s*([|%]])', '%1')
		file = mw.ustring.gsub(file, '|%s*left%s*([|%]])', '%1')
		file = mw.ustring.gsub(file, '|%s*right%s*([|%]])', '%1')
		file = mw.ustring.gsub(file, '|%s*center%s*([|%]])', '%1')
		file = mw.ustring.gsub(file, '|%s*centre%s*([|%]])', '%1')
		file = mw.ustring.gsub(file, '|%s*none%s*([|%]])', '%1')
		file = mw.ustring.gsub(file, '|%s*baseline%s*([|%]])', '%1')
		file = mw.ustring.gsub(file, '|%s*sub%s*([|%]])', '%1')
		file = mw.ustring.gsub(file, '|%s*super%s*([|%]])', '%1')
		file = mw.ustring.gsub(file, '|%s*top%s*([|%]])', '%1')
		file = mw.ustring.gsub(file, '|%s*text%-top%s*([|%]])', '%1')
		file = mw.ustring.gsub(file, '|%s*bottom%s*([|%]])', '%1')
		file = mw.ustring.gsub(file, '|%s*text%-bottom%s*([|%]])', '%1')
		file = mw.ustring.gsub(file, '|%s*framed?%s*([|%]])', '%1')
		file = mw.ustring.gsub(file, '|%s*frameless%s*([|%]])', '%1')
		file = mw.ustring.gsub(file, '|%s*upright%s*[0-9%.]*%s*([|%]])', '%1')
		file = mw.ustring.gsub(file, '|%s*upright%s*=.-([|%]])', '%1')
		file = mw.ustring.gsub(file, '|%s*link%s*=.-([|%]])', '%1')
		file = mw.ustring.gsub(file, '|%s*lang%s*=.-([|%]])', '%1')
		-- remove spaces prior to captions (which cause pre-formatted text)
		file = mw.ustring.gsub(file, '|%s*', '|')
		-- remove sizes, which sometimes get mistaken for captions
		file = mw.ustring.gsub(file, '|%s*%d*x?%d+%s*px%s*([|%]])', '%1')
		-- remove linebreaks
		file = mw.ustring.gsub(file, '\n\n', '<br>')
		file = mw.ustring.gsub(file, '\n', '')
		-- remove surrounding square brackets
		file = mw.ustring.gsub(file, '^%[%[', '')
		file = mw.ustring.gsub(file, '%]%]$', '')
		table.insert(files, file)
	end
	return files
end

--Central function for fixing issues that could occur in both gallery-fetched and file-fetched files
local function doubleCheck(file)
	-- disable pipes in wikilinks
	file = file:gsub(
		"%[%[([^%]]-)|(.-)]]",
		"[[%1__PIPE__%2]]")
	-- move any alt parameter to the end to avoid putting the switcher in too early and causing a linter error
	file = file:gsub(
		"^(.+)(|alt=[^|]*)(.*)$",
		"%1%3%2")
	-- bring back pipes in wikilinks
	file = file:gsub(
		"%[%[(.-)__PIPE__(.-)]]",
		"[[%1|%2]]")
	return file
end

function makeTranscludedGalleryLinesTables(args)
	local namespaceNumber = function(pagetitle)
		local titleObject = mw.title.new(pagetitle)
		return titleObject and titleObject.namespace
	end
	local lines = {}
	local i = 1
	while args[i] do
		if namespaceNumber(args[i]) == 6 then -- file namespace
			-- args[i] is either just the filename, or uses syntax File:Name.jpg##Caption##Credit
			local parts = mw.text.split(args[i], '##%s*')
			local filename = parts[1]
			local caption = args['caption'..i] or parts[2] or false
			local credit = args['credit'..i] or parts[3] or false
			local line = makeGalleryLine(filename, caption, credit)
			table.insert(lines, line)
		else
			local content, pagename = excerptModule.getContent(args[i])
			if not pagename then
				return error('Cannot read a valid page for "' .. args[i] .. '"', 0)
			elseif not content then
				return error('No content found on page "' .. args[i] .. '"', 0)
			end
			if args['section'..i] then
				content = excerptModule.getSection(content, args['section'..i]) or ''
			end
			content = excerptModule.cleanupText(content, {keepSubsections=true, ignoreOnlyincludes=true}) -- true means keep subsections
	
			local galleryFiles = extractGalleryFiles(content)
			if galleryFiles then
				for _, f in pairs(galleryFiles) do
					if hasCaption(f) then
						local filename = string.gsub(f, '|.*', '')
						local isOkay = excerptModule.checkImage(filename)
						if isOkay then
							table.insert(lines, doubleCheck(f.." (from '''[["..pagename.."]]''')"))
						end
					end
				end
			end
	
			local otherFiles = excerptModule.parse(content, {fileflags="1-100", filesOnly=true})
			if otherFiles then
				for _, f in pairs(extractRegularFiles(otherFiles)) do
					if f and f ~= '' and mw.ustring.sub(f, 1, 5) == 'File:' and hasCaption(f) then
						table.insert(lines, doubleCheck(f.." (from '''[["..pagename.."]]''')"))
					end
				end
			end
		
		end
		i = i + 1
	end
	return ( #lines > 0 ) and lines or error('No images found')
end

p._main = function(args, transclude, extraClassName)
	if not args[1] then
		return error(linked and 'No page specified' or 'No page specified', 0)
	end
	local lines = transclude and makeTranscludedGalleryLinesTables(args) or makeGalleryLinesTable(args)
	local classNames = 'randomSlideshow-container'
	if extraClassName then classNames = classNames .. ' ' .. extraClassName end
	return makeOutput(lines, args.width or '100%', classNames, isDeclined(args.random))
end

p.main = function(frame)
	local parent = frame.getParent(frame)
	local parentArgs = parent.args
	local args = cleanupArgs(parentArgs)
	local output = p._main(args, false)
	return frame:extensionTag{ name='templatestyles', args = { src='Module:Random slideshow/styles.css'} } 
		.. frame:preprocess(output)
end

p.transclude = function(frame)
	local parent = frame.getParent(frame)
	local parentArgs = parent.args
	local args = cleanupArgs(parentArgs)
	local output = p._main(args, true)
	return frame:extensionTag{ name='templatestyles', args = { src='Module:Random slideshow/styles.css'} } 
		.. frame:preprocess(output)
end

return p

v t e Portal templates
Visual overview of template usage
Layout and formatting	{{Box portal skeleton}} {{Box-header}} color palettes plain round square watch {{Box-header colour}}^[1] {{Box-footer}} {{Flex columns}} {{Plain navboxes}}
Content transclusion	{{Transclude lead excerpt}}^[2] {{Transclude linked excerpt}}^[2] {{Transclude list item excerpt}}^[2] {{Transclude random excerpt}}^[2] {{Transclude selected excerpt}}^[2] {{Excerpt}} {{Transclude DYK}}^[9] {{Transclude selected current events}}^[3] {{Transclude selected recent additions}}^[4]
Content slideshows	{{Random slideshow}}^[5] {{Transclude files as random slideshow}}^[5] {{Transclude excerpts as random slideshow}}^[6] {{Transclude linked excerpts as random slideshow}}^[6] {{Transclude list item excerpts as random slideshow}}^[6]
Content randomisation	{{Random portal component}}^[7] {{Random quotation}} {{Random subpage}}
General	{{Portals}} {{Portals browsebar}} {{Portal description}} {{Portal information sidebar}} {{Portal navbar no header2}} {{Purge link portals}} {{Wikimedia for portals}}
Linking templates	{{Portal}}^[11] {{Portal bar}}^[12] {{Portal-inline}}^[13] {{Pbox}} {{Related portals2}}
Talk pages / Maintenance	{{Portal talk}} {{Portal maintenance status}}^[8] {{Portal suggestions}} {{Portal toolbox}} {{WikiProject Portals}}^[8]
Images	{{Portal dynamic image}} {{Portal image banner}}^[10] {{Portal pictures}}^[14] {{Portal POTD}}
Modules	1. Module:Box-header 2. Module:Excerpt/portals 3. Module:Selected current events 4. Module:Selected recent additions 5. Module:Random slideshow 6. Module:Excerpt slideshow 7. Module:Random portal component 8. Module:Portal maintenance status 9. Module:Transclude DYK 10. Module:Portal image banner 11. Module:Portal 12. Module:Portal bar 13. Module:Portal-inline 14. Module:Portal pictures
Usage	Wikipedia:Portal Wikipedia:WikiProject Portals
For more information, see: Category:Template-Class Portal pages and Category:Wikipedia Portal templates