-- module import local yn = require( 'Module:Yesno' )  -- module variable local sg = { 	-- administration 	moduleInterface = { 		suite  = 'Scroll Gallery', 		serial = '2024-07-05', 		item   = 87862715 	},  	-- miscellaneous messages 	texts = { 		badSize        = '<span class="error">Fehlerhafte Größenangabe</span>[[Category:Bildergalerie: fehlerhafte Größenangabe]] ', 		fileNS         = { '[Ff]ile', '[Ii]mage', '[Dd]atei', '[Bb]ild' }, 		missingFile    = '<span class="error">Fehlender Dateiname</span>[[Category:Bildergalerie: fehlender Dateiname]] ', 		noImage        = '<span class="error">Kein Bild definiert</span>[[Category:Bildergalerie: kein Bild definiert]] ', 		sizeUsed       = '[[Category:Bildergalerie: Größenangaben verwendet]]', 		unknownFiles   = '<span class="error">Fehlerhafte(r) Dateiname(n)</span>[[Category:Bildergalerie: fehlerhafte Dateinamen]] ', 		unknownParams  = '<span class="error">Fehlerhafte(r) Parameter</span>[[Category:Bildergalerie: fehlerhafte Parameter]] ' 	},  	-- possible argument identifiers 	params = { 		align          = { 'align', 'Ausrichtung', default = 'right' }, 		background     = { 'background', 'Hintergrund' }, 		border         = { 'border', 'Rahmen' }, 		headerStyles   = 'headerStyles', 		height         = { 'height', 'heights', 'maxHeight', 'Höhe' }, 		hideUnitHeader = { 'hideUnitHeader', default = 'no' }, 		imageGrStyles  = 'imageGrStyles', 		loop           = { 'loop', 'Schleife', default = 'yes' }, 		styles         = 'styles', 		timeDependent  = { 'timeDependent', default = 'no' }, 		title          = { 'title', 'Titel' }, 		width          = { 'width', 'Breite', 'Größe' } 	},  	-- possible alignment values 	align = { 		left      = 'left', 		links     = 'left', 		right     = 'right', 		rechts    = 'right', 		center    = 'center', 		mitte     = 'center', 		zentriert = 'center' 	},  	-- graphics and video extensions excluding audio extensions 	extensions = { 'tif', 'tiff', 'png', 'gif', 'jpg', 'jpeg', 'jpe', 'webp', 		'xcf', 'ogg', 'ogv', 'svg', 'pdf', 'djvu', 'stl', 'webm', 'mpg', 'mpeg' } }  local errorMsgs = {}  -- add error message to errorMsgs table local function addErrorMsg( msg ) 	table.insert( errorMsgs, msg ) end  -- get errorMsgs table as string local function getErrorMsgs() 	local result = table.concat( errorMsgs, ' ' ) 	if result ~= '' then 		result = result .. ' ' 	end 	return result end  -- check if param is set: not nil or empty local function isSet( param ) 	return param and param ~= ''; end  -- check for possible arguments against list table local function checkParams( frameArgs, list ) 	local complete = {} 	local args = {}  	-- named arguments 	for key, value in pairs( list ) do 		if type( value ) == 'table' then 			for key2, value2 in ipairs( value ) do 				complete[ value2 ] = key 				args[ key ] = args[ key ] or frameArgs[ value2 ] 			end 			args[ key ] = args[ key ] or '' 		elseif value ~= '' then 			complete[ value ] = key 			args[ key ] = frameArgs[ value ] or '' 		else 			complete[ key ] = key 			args[ key ] = frameArgs[ key ] or '' 		end 		if args[ key ] == '' and type( value ) == 'table' and value.default then 			args[ key ] = value.default 		end 	end  	local ok = true 	for key, value in pairs( frameArgs ) do 		-- numbered arguments 		if tonumber( key ) then 			-- frameArgs[ key ] cannot be nil 			args[ key ] = mw.text.trim( frameArgs[ key ] ) 		end 		if not complete[ key ] and not tonumber( key ) then 			ok = false 		end 	end 	if not ok then 		addErrorMsg( sg.texts.unknownParams ) 	end 	return args end  -- make image-size parameter string from width and height with check local function makeSize( width, height ) 	if width ~= '' then 		width = width:gsub( 'px$', '' ) 	end 	if height ~= '' then 		height = height:gsub( 'px$', '' ) 	end  	local at = width:find( 'x' ) 	if at then 		height = width:sub( at + 1, #width ) 		width = width:sub( 1, at - 1 ) 	end  	local value = tonumber( width ) 	if isSet( width ) and not value then 		addErrorMsg( sg.texts.badSize ) 	end 	local size = '' 	if value and value > 10 and value <= 1000 then 		size = width 	end 	value = tonumber( height ) 	if isSet( height ) and not value then 		addErrorMsg( sg.texts.badSize ) 	end 	if value and value > 10 and value <= 1000 then 		size = size .. 'x' .. height 	end 	if size ~= '' then 		return '|' .. size .. 'px' 	else 		return '' 	end end  -- main function for Scroll Gallery template function sg.gallery( frame ) 	local args = checkParams( frame:getParent().args, sg.params )  	-- generate output: outer div and title 	local gallery = mw.html.create( 'div' ) 		:addClass( 'voy-ImageGroup' ) 	local align = sg.align[ args.align:lower() ] or '' 	if align == 'left' then 		gallery:addClass( 'voy-ImageGroupLeft' ) 	elseif align == 'center' then 		gallery:addClass( 'voy-ImageGroupCenter' ) 	else -- default: right 		gallery:addClass( 'voy-ImageGroupRight' ) 	end 	if yn( args.timeDependent, false ) then 		gallery:addClass( 'voy-timeDependent' ) 	end 	if not yn( args.loop, true ) then 		gallery:addClass( 'voy-noLoop' ) 	end 	if yn( args.hideUnitHeader, false ) then 		gallery:addClass( 'voy-hideUnitHeader' ) 	end  	-- add styles 	local node 	if args.border ~= '' then 		gallery:css( 'border-color', args.border ) 	end 	if args.background ~= '' then 		-- color ist set for linter 		gallery:css( { ['background-color'] = args.background, color = 'inherit' } ) 	end 	gallery:cssText( args.styles ) 	if args.title ~= '' then 		node = mw.html.create( 'div' ) 			:addClass( 'voy-ImageGroupHeader' ) 			:wikitext( args.title ) 		if args.headerStyles ~= '' then 			node:cssText( args.headerStyles ) 		end 		gallery:node( node ) 	end  	-- prepare size attribute 	local size = makeSize( args.width, args.height )  	-- add image groups and images 	local i = 1 	local ok = true 	local fileOk, imNode 	while isSet( args[ i ] ) do 		-- remove LTR and RTL marks 		args[ i ] = mw.ustring.gsub( args[ i ], '[‎‏]+', '' )  		-- delete namespace 		for j, ns in ipairs( sg.texts.fileNS ) do 			args[ i ] = mw.ustring.gsub( args[ i ], '^' .. ns .. ':', '' ) 		end  		-- check files for possible file extensions 		fileOk = false 		if ok then 			for j, ext in ipairs( sg.extensions ) do 				if args[ i ]:lower():find( '^.+%.' .. ext .. '$' ) then 					fileOk = true 					break 				end 			end 		end 		if not fileOk then 			ok = false 		end  		-- prepare image caption 		if isSet( args[ i + 1 ] ) then 			args[ i + 1 ] = '|' .. args[ i + 1 ] 		else 			args[ i + 1 ] = '' 		end  		-- generate image syntax and create container for additional img styles 		imNode = mw.html.create( 'div' ) 			:addClass( 'voy-ImageGrUnitInner' ) 			:wikitext( mw.ustring.format( '[[File:%s|thumb|center%s%s]]', 				args[ i ], size, args[ i + 1 ] ) ) 		if args.imageGrStyles ~= '' then 			imNode:cssText( args.imageGrStyles ) 		end 		-- create image-container div for scroll icons and image 		node = mw.html.create( 'div' ) 			:addClass( 'voy-ImageGrUnit' ) 			:node( imNode ) 		if i > 1 then 			node:css( 'display', 'none' ) 		end 		gallery:node( node )  		i = i + 2 	end  	-- add error and hint messages 	if not isSet( args[ i ] ) and isSet( args[ i + 1 ] ) then 		addErrorMsg( sg.texts.missingFile ) 	end 	if not isSet( args[ 1 ] ) then 		addErrorMsg( sg.texts.noImage ) 	end 	if not ok then 		addErrorMsg( sg.texts.unknownFiles ) 	end 	if args.width .. args.height ~= '' then 		addErrorMsg( sg.texts.sizeUsed ) 	end 	return getErrorMsgs() .. tostring( gallery ) end  return sg