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local p = {}
function p.base( f )
	local args = f
	if f == mw.getCurrentFrame() then 
		args = require( 'Module:ProcessArgs' ).merge( true )
	else
		f = mw.getCurrentFrame()
	end
 
	-- Default settings
	local default = {
		scale = 1,
		sheetsize = 256,
		size = 16,
		pos = 1,
		align = 'text-top'
	}
 
	local defaultStyle = default
	if args.settings then
		local settings = mw.loadData( 'Module:' .. args.settings )
		if not settings.stylesheet then
			-- Make a separate clone of the current default settings
			defaultStyle = mw.clone( default )
		end
		for k, v in pairs( settings ) do
			default[k] = v
		end
	end
 
	local setting = function( arg )
		return args[arg] or default[arg]
	end
 
	local sprite = mw.html.create( 'span' ):addClass( 'sprite' )
	sprite:tag( 'br' )
 
	-- mw.html's css method performs very slow escaping, which doubles the time it takes
	-- to run, so we'll construct the styles manually, and put them in the cssText
	-- method, which only does html escaping (which isn't slow)
	local styles = {}
 
	if setting( 'stylesheet' ) then
		sprite:addClass(
			setting( 'classname' ) or
			mw.ustring.lower( setting( 'name' ):gsub( ' ', '-' ) ) .. '-sprite'
		)
	else
		table.insert( styles, 'background-image:{{FileUrl|' .. (
			setting( 'image' ) or setting( 'name' ) .. 'Sprite.png'
		) .. '}}' )
	end
	local class = setting( 'class' )
	if class then
		sprite:addClass( class )
	end
 
	local size = setting( 'size' )
	local pos = math.abs( setting( 'pos' ) ) - 1
	local sheetWidth = setting( 'sheetsize' )
	local tiles = sheetWidth / size
	local left = pos % tiles * size
	local top = math.floor( pos / tiles ) * size
	local scale = setting( 'scale' )
	local autoScale = setting( 'autoscale' )
 
	if left > 0 or top > 0 then
		table.insert( styles, 'background-position:-' .. left * scale .. 'px -' .. top * scale .. 'px' )
	end
	if not autoScale and scale ~= defaultStyle.scale then
		table.insert( styles, 'background-size:' .. sheetWidth * scale .. 'px auto' )
	end
	if size ~= defaultStyle.size or ( not autoScale and scale ~= defaultStyle.scale ) then
		table.insert( styles, 'height:' .. size * scale .. 'px' )
		table.insert( styles, 'width:' .. size * scale .. 'px' )
	end
	local align = setting( 'align' )
	if align ~= defaultStyle.align then
		table.insert( styles, 'vertical-align:' .. align )
	end
	table.insert( styles, setting( 'css' ) )
	sprite:cssText( table.concat( styles, ';' ) )
 
	local text = setting( 'text' )
	local root
	local spriteText
	if text then
		root = mw.html.create( 'span' ):addClass( 'nowrap' )
		spriteText = mw.html.create( 'span' ):addClass( 'sprite-text' ):wikitext( text )
	end
 
	local title = setting( 'title' )
	if title then
		( root or sprite ):attr( 'title', title )
	end
 
	if not root then
		root = mw.html.create( '' )
	end
	root:node( sprite )
	if spriteText then
		root:node( spriteText )
	end
 
	local link = setting( 'link' ) or ''
	if link ~= '' and mw.ustring.lower( link ) ~= 'none' then
		-- External link
		if link:find( '//' ) then
			return '[' .. link .. ' ' .. tostring( root ) .. ']'
		end
 
		-- Internal link
		local linkPrefix = setting( 'linkprefix' ) or ''
		return '[[' .. linkPrefix .. link .. '|' .. tostring( root ) .. ']]'
	end
 
	return tostring( root )
end
 
function p.sprite( f )
	local args = f
	if f == mw.getCurrentFrame() then
		args = require( 'Module:ProcessArgs' ).merge( true )
	else
		f = mw.getCurrentFrame()
	end
 
	local categories = {}
	local idData = args.iddata
	if not idData then
		local default = {}
		if args.settings then
			default = mw.loadData( 'Module:' .. args.settings )
		end
 
		local name = args.name or default.name
		local ids = mw.loadData( 'Module:' .. ( args.ids or default.ids or name .. '/IDs' ) )
		ids = ids.ids or ids
		local id = mw.text.trim( tostring( args[1] or '' ) )
		idData = ids[id] or ids[mw.ustring.lower( id ):gsub( '[%s%+]', '-' )]
	end
 
	local title = mw.title.getCurrentTitle()
	-- Remove categories on language pages, talk pages, and in User/UserWiki/UserProfile namespaces
	local disallowCats = title.isTalkPage or title.nsText:find( '^User' )
	if idData then
		if type( idData ) == 'table' then
			if idData.deprecated and not disallowCats then
				table.insert( categories, f:expandTemplate{ title = 'Translation category', args = { 'Pages using deprecated sprite names', project = 0 } } )
			end
 
			args.pos = idData.pos
		else
			args.pos = idData
		end
	elseif not disallowCats then
		table.insert( categories, f:expandTemplate{ title = 'Translation category', args = { 'Pages with missing sprites', project = 0 } } )
	end
 
	return p.base( args ), table.concat( categories, '' )
end
 
function p.link( f )
	local args = f
	if f == mw.getCurrentFrame() then
		args = require( 'Module:ProcessArgs' ).merge( true )
	end
 
	local link = args[1]
	if args[1] and not args.id then
		link = args[1]:match( '^(.-)%+' ) or args[1]
	end
	local text = args.text or args[2] or link
 
	args[1] = args.id or args[1]
	args.link = args.link or link
	args.text = text
 
	return p.sprite( args )
end
 
function p.doc( f )
	local args = f
	if f == mw.getCurrentFrame() then
		args = f.args
	else
		f = mw.getCurrentFrame()
	end
	local settingsPage = mw.text.trim( args[1] )
	local settings = mw.loadData( 'Module:' .. settingsPage )
	local idsPage = 'Module:' .. ( settings.ids or settings.name .. '/IDs' )
 
	local getProtection = function( title, action, extra )
		local protections = { 'edit' }
		if extra then
			table.insert( protections, extra )
		end
 
		local addProtection = function( protection )
			if protection == 'autoconfirmed' then
				protection = 'editsemiprotected'
			elseif protection == 'sysop' then
				protection = 'editprotected'
			end
 
			table.insert( protections, protection )
		end
 
		local direct = title.protectionLevels[action]
		for _, protection in ipairs( direct ) do
			addProtection( protection )
		end
		local cascading = title.cascadingProtection.restrictions[action] or {}
		if #cascading > 0 then
			table.insert( protections, 'protect' )
		end
		for _, protection in ipairs( cascading ) do
			addProtection( protection )
		end
 
		return table.concat( protections, ',' )
	end
 
	local body
	if args.refresh then
		body = mw.html.create( '' )
	else
		local idsTitle = mw.title.new( idsPage )
		local spritesheet = settings.image or settings.name .. 'Sprite.png'
		local spriteTitle = mw.title.new( 'File:' .. spritesheet )
		local idsProtection = getProtection( idsTitle, 'edit' )
		local spriteProtection = getProtection( spriteTitle, 'upload', 'upload,reupload' )
		body = mw.html.create( 'div' ):attr( {
			id = 'spritedoc',
			['data-idspage'] = idsTitle.id,
			['data-idsprotection'] = idsProtection,
			['data-idstimestamp'] = f:callParserFunction( 'REVISIONTIMESTAMP', idsPage ),
			['data-spritesheet'] = spritesheet,
			['data-spriteprotection'] = spriteProtection,
			['data-pos'] = settings.pos or 1,
			['data-refreshtext'] = mw.text.nowiki( '{{#invoke:sprite|doc|' .. settingsPage .. '|refresh=1}}' )
		} )
	end
 
	local data = mw.loadData( idsPage )
 
	local sections = {}
	for _, sectionData in ipairs( data.sections or { 'Uncategorized' } ) do
		local sectionTag = body:tag( 'div' ):addClass( 'spritedoc-section' ):attr( 'data-section-id', sectionData.id )
		-- https://phabricator.wikimedia.org/T73594
		sectionTag:wikitext( '<h3>', sectionData[1], '</h3>' )
		sections[sectionData.id] = { boxes = sectionTag:tag( 'ul' ):addClass( 'spritedoc-boxes' ) }
	end
 
	local keyedData = {}
	for name, idData in pairs( data.ids ) do
		table.insert( keyedData, {
			sortKey = mw.ustring.lower( name ),
			name = name,
			data = idData
		} )
	end
	table.sort( keyedData, function( a, b )
		return a.sortKey < b.sortKey
	end )
 
	for _, data in ipairs( keyedData ) do
		local idData = data.data
		local pos = idData.pos
		local section = sections[idData.section]
		local names = section[pos]
		if not names then
			local box = section.boxes:tag( 'li' ):addClass( 'spritedoc-box' ):attr( 'data-pos', pos )
			box:tag( 'div' ):addClass( 'spritedoc-image' )
				:wikitext( p.base{ pos = pos, settings = settingsPage } )
 
			names = box:tag( 'ul' ):addClass( 'spritedoc-names' )
			section[pos] = names
		end
		local nameElem = mw.html.create( 'li' ):addClass( 'spritedoc-name' )
		local codeElem = nameElem:tag( 'code' ):wikitext( data.name )
 
		if idData.deprecated then
			codeElem:addClass( 'spritedoc-deprecated' )
		end
		names:wikitext( tostring( nameElem ) )
	end
 
	if args.refresh then
		return '', tostring( body )
	end
	return f:callParserFunction( '#widget:Stylesheet', { page = 'SpriteDoc' } ), tostring( body )
end
return p

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