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local p = {}
function p.base( f )
	local args = f
	if f == mw.getCurrentFrame() then 
		args = require( 'Module:ProcessArgs' ).merge( true )
	end
 
	-- Default settings
	local default = {
		scale = 1,
		sheetsize = 256,
		size = 16,
		pos = 1,
		link = '',
		align = 'text-top',
		class = '',
		text = '',
		title = ''
	}
 
	local defaultStyle = mw.clone( default )
	if args.settings then
		local settings = mw.loadData( 'Module:' .. args.settings )
		for k, v in pairs( settings ) do
			default[k] = v
			if settings.stylesheet then
				defaultStyle[k] = v
			end
		end
	end
 
	local name = args.name or default.name
	local scale = args.scale or default.scale
	local autoScale = args.autoscale or default.autoscale
	local sheetWidth = args.sheetsize or default.sheetsize
	local size = args.size or default.size
	local pos = math.abs( args.pos or default.pos ) - 1
	local link = args.link or default.link
	local align = args.align or default.align
	local class = args.class or default.class
	local text = args.text or default.text
	local title = args.title or default.title
	local css = args.css or default.css
	local className = args.classname or default.classname
 
	local tiles = sheetWidth / size
	local left = pos % tiles * size
	local top = math.floor( pos / tiles ) * size
 
	local styles = {}
	if args.stylesheet or default.stylesheet then
		class = ( className or mw.ustring.lower( name:gsub( ' ', '-' ) ) .. '-sprite ' ) .. class
	else
		table.insert( styles, 'background-image:{{FileUrl|' .. ( args.image or default.image or name .. 'Sprite.png' ) .. '}}' )
	end
	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;width:' .. size * scale .. 'px' )
	end
	if align ~= defaultStyle.align then
		table.insert( styles, 'vertical-align:' .. align )
	end
	if css then
		table.insert( styles, css )
	end
	if title ~= '' then
		title = ' title="' .. title .. '"'
	end
 
	local sprite = table.concat( {
		'<span',
			'class="sprite ' .. class .. '"',
			'style="' .. table.concat( styles, ';' ) .. '"',
			title,
		'><br></span>'
	}, ' ' )
	sprite = sprite:gsub( '%s+([">])', '%1' )
 
	if text ~= '' then
		text = '<span class="sprite-text nowrap"' .. title .. '>' .. text .. '</span>'
	end
 
	if link ~= '' then
		if link:find( '//' ) then
			-- External link
			return '[' .. link .. ' ' .. sprite .. text .. ']'
		else
			-- Internal link
			local linkPrefix = args.linkprefix or default.linkprefix or ''
			return '[[' .. linkPrefix .. link .. '|' .. sprite .. text .. ']]'
		end
	else
		return sprite .. text
	end
end
 
function p.sprite( f )
	local args = f
	if f == mw.getCurrentFrame() then
		args = require( 'Module:ProcessArgs' ).merge( true )
	end
 
	local category = ''
	if tonumber( args[1] ) then
		args.pos = args[1]
	else
		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 'Sprite/' .. name ) )
		local id = mw.text.trim( args[1] or '' )
		local pos = ids[id] or ids[mw.ustring.lower( id ):gsub( '[%s%+]', '-' )]
		if not pos and not mw.title.getCurrentTitle().isSubpage then
			category = '[[Category:Pages with missing sprites]]'
		end
		args.pos = pos
	end
 
	return p.base( args ) .. category
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 settings = mw.loadData( 'Module:' .. f.args[1] )
	local idTable = mw.title.new( 'Module:' .. ( settings.ids or 'Sprite/' .. settings.name ) ):getContent()
	idTable = idTable:gsub( '(\n%s*%-%-%s*.-%s*%-%-%s*\n)', '%1,' ):gsub( '^return {', '' ):gsub( '}$', '' )
 
	local html = {}
	local ids = {}
	local posKeys = {}
	local section = ''
	for line in mw.text.gsplit( idTable, ',' ) do
		line = mw.text.trim( line )
		id = line:match( '^%[[\'"](.+)[\'"]%]' ) or line:match( '^%w+' ) or ''
		pos = line:match( '=%s*(%d+)%s*,?$' ) or ''
		section = line:match( '^%-%-%s*(.+)%s*%-%-$' ) or section
 
		if id ~= '' and pos ~= '' then
			if ids[pos] then
				if type( ids[pos].id ) == 'table' then
					table.insert( ids[pos].id, id )
				else
					ids[pos].id = { ids[pos].id, id }
				end
			else
				ids[pos] = { id = id, section = section }
				table.insert( posKeys, pos )
			end
		end
	end
 
	local list = {}
	local listHead = '<ul class="spritedoc-multicolumn">'
	local listFoot = '</ul>'
	local lastSection = ''
	for i, pos in ipairs( posKeys ) do
		local id = ids[pos].id
		local newSection = mw.text.trim( ids[pos].section )
 
		if newSection ~= lastSection or i == 1 then
			if newSection ~= lastSection then
				if lastSection ~= '' then
					table.insert( list, listFoot )
				end
 
				table.insert( list, '\n===' .. newSection .. '===\n' )
				lastSection = newSection
			end
			table.insert( list, listHead )
		end
		table.insert( list, '<li><table><tr><td data-pos="' .. pos .. '">' )
		if type( id ) == 'table' then
			for i, id2 in ipairs( id ) do
				if i == 1 then
					table.insert( list, p.sprite{ id2, settings = f.args[1] } .. '</td><td><div class="sprite-id"><code>' .. id2 .. '</code></div>' )
				else
					table.insert( list, '<div class="sprite-id"><code>' .. id2 .. '</code></div>' )
				end
			end
		else
			table.insert( list, p.sprite{ id, settings = f.args[1] } .. '</td><td><div class="sprite-id"><code>' .. id .. '</code></div>' )
		end
		table.insert( list, '</td></tr></table></li>' )
 
		if i == #posKeys then
			table.insert( list, listFoot )
		end
	end
 
	local out = table.concat( list )
	if not f.args.refresh then
		out = f:preprocess( '{{#widget:stylesheet|page=Sprite doc}}' ) .. '<div id="sprite-doc" data-settings="' .. f.args[1] .. '">' .. out .. '</div>'
	end
 
	return out
end
return p

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