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local p = {}
 
-- List of special prefixes which should be handled by
-- other modules (such as being moved outside links)
p.prefixes = {
	'Any',
	'Matching',
	'Damaged'
}
 
function p.slot( f )
	local args = f.args or f
	if f == mw.getCurrentFrame() and args[1] == nil then
		args = f:getParent().args
	end
 
	args[1] = mw.text.trim( args[1] or '' )
 
	-- Comment this next line out if you're not using aliases
	local aliases = mw.loadData( 'Module:Inventory/Aliases' )
 
	local modAliases = args.modaliases or ''
	if modAliases ~= '' then
		modAliases = mw.loadData( 'Module:' .. modAliases )
	else
		modAliases = nil
	end
 
	if aliases or modAliases then
		local frames = {}
		for frame in mw.text.gsplit( args[1], '%s*;%s*' ) do
			local frameParts = p.getParts( frame, args.mod )
 
			local id = frameParts.name
			if frameParts.mod then
				id = frameParts.mod .. ':' .. id
			end
 
			local alias
			if modAliases and modAliases[id] then
				alias = modAliases[id]
			elseif aliases and aliases[id] then
				alias = aliases[id]
			end
 
			if alias then
				table.insert( frames, p.expandAlias( frameParts, alias ) )
			else
				table.insert( frames, frame )
			end
		end
 
		args[1] = table.concat( frames, ';' )
	end
 
	local sprite
	local ids = mw.loadData( [[Module:InvSprite/IDs]] ).ids
	local modIds = {}
	local animated = args[1]:find( ';' )
	local pageName = mw.title.getCurrentTitle().text
	local imgClass = args.imgclass
	local numStyle = args.numstyle
	local body = mw.html.create( 'span' ):addClass( 'invslot' ):css{ ['vertical-align'] = args.align }
	if animated then
		body:addClass( 'animated' )
	end
	if args.class then
		body:addClass( args.class )
	end
	if args.style then
		body:cssText( args.style )
	end
 
	if ( args.default or '' ) ~= '' then
		body:css( 'background-image', '{{FileUrl|' .. args.default .. '.png}}' )
	end
 
	local first = true
	for frame in mw.text.gsplit( args[1], '%s*;%s*' ) do
		local item
		if frame ~= '' or frame == '' and animated then
			item = body:tag( 'span' ):addClass( 'invslot-item' )
			if imgClass then
				item:addClass( imgClass )
			end
		end
 
		if frame == '' then
			( item or body ):tag( 'br' )
		else
			local category
			local parts = p.getParts( frame, args.mod )
			local title = parts.title or mw.text.trim( args.title or '' )
			local mod = parts.mod
			local name = parts.name
			local num = parts.num
			local description = parts.text
 
			local img, idData
			if mod then
				local modData = modIds[mod]
				if not modData and mw.title.new( 'Module:InvSprite/Mods/' .. mod .. '/IDs' ).exists then
					modData = mw.loadData( 'Module:InvSprite/Mods/' .. mod .. '/IDs' )
					modIds[mod] = modData
				end
				if modData and modData[name] then
					idData = modData[name]
				else
					img = name .. ' (' .. mod .. ')'
				end
			elseif ids[name] then
				idData = ids[name]
			else
				img = name
			end
 
			local link = args.link or ''
			if link == '' then
				if mod then
					link = 'Mods/' .. mod .. '/' .. name
				else
					link = name:gsub( '^Damaged ', '' )
				end
			elseif link:lower() == 'none' then
				link = nil
			end
			if link == pageName then
				link = nil
			end
 
			local formattedTitle
			local plainTitle
			if title == '' then
				plainTitle = name
			elseif title:lower() ~= 'none' then
				plainTitle = title:gsub( '\\\\', '\' ):gsub( '\\&', '&' )
 
				local formatPattern = '&[0-9a-fk-or]'
				if plainTitle:match( formatPattern ) then
					formattedTitle = title
					plainTitle = plainTitle:gsub( formatPattern, '' )
				end
 
				if plainTitle == '' then
					plainTitle = name
				else
					plainTitle = plainTitle:gsub( '\', '\\' ):gsub( '&', '&' )
				end
			elseif link then
				if img then
					formattedTitle = ''
				else
					plainTitle = ''
				end
			end
 
			item:attr{
				['data-minetip-title'] = formattedTitle,
				['data-minetip-text'] = description
			}
 
			if img then
				-- & is re-escaped because mw.html treats attributes
				-- as plain text, but MediaWiki doesn't
				local escapedTitle = ( plainTitle or '' ):gsub( '&', '&' )
				item:addClass( 'invslot-item-image' )
					:wikitext( '[[File:Grid ', img, '.png|32x32px|link=', link or '', '|', escapedTitle, ']]' )
			else
				if not sprite then
					sprite = require( [[Module:Sprite]] ).sprite
				end
				local image
				if mod then
					image = args.spritesheet or mod .. 'Sprite.png'
				end
				if link then
					item:wikitext( '[[', link, '|' )
				end
				local image, spriteCat = sprite{
					iddata = idData, title = plainTitle,
					image = image, settings = 'InvSprite'
				}
				item:node( image )
				category = spriteCat
			end
 
			if num and num > 1 and num < 1000 then
				if img and link then
					item:wikitext( '[[', link, '|' )
				end
				local number = item
					:tag( 'span' )
						:addClass( 'invslot-stacksize' )
						:attr{ title = plainTitle }
						:wikitext( num )
				if numStyle then
					number:cssText( numStyle )
				end
				if img and link then
					item:wikitext( ']]' )
				end
			end
 
			if idData and link then
				item:wikitext( ']]' )
			end
 
			item:wikitext( category )
		end
 
		if first then
			if animated and item then
				item:addClass( 'active' )
			end
			first = false
		end
	end
 
	return tostring( body )
end
 
function p.expandAlias( frameParts, alias )
	-- If the frame has no parts, we can just return the alias as-is
	if not frameParts.title and not frameParts.mod and not frameParts.num and not frameParts.text then
		return alias
	end
 
	local expandedFrames = {}
	for aliasFrame in mw.text.gsplit( alias, '%s*;%s*' ) do
		local aliasParts = p.getParts( aliasFrame )
		aliasParts.title = frameParts.title or aliasParts.title or ''
		aliasParts.mod = frameParts.mod or aliasParts.mod or 'Minecraft'
		aliasParts.num = frameParts.num or aliasParts.num or ''
		aliasParts.text = frameParts.text or aliasParts.text or ''
 
		table.insert( expandedFrames, string.format(
			'[%s]%s:%s,%s[%s]',
			aliasParts.title, aliasParts.mod, aliasParts.name, aliasParts.num, aliasParts.text
		) )
	end
 
	return table.concat( expandedFrames, ';' )
end
 
function p.getParts( frame, mod )
	local parts = {}
	parts.title = frame:match( '^%[%s*([^%]]+)%s*%]' )
 
	parts.mod = mw.text.trim( frame:match( '([^:%]]+):' ) or mod or '' )
 
	local vanilla = { v = 1, vanilla = 1, mc = 1, minecraft = 1 }
	if parts.mod == '' or vanilla[mw.ustring.lower( parts.mod )] then
		parts.mod = nil
	end
 
	local nameStart = ( frame:find( ':' ) or frame:find( '%]' ) or 0 ) + 1
	if nameStart - 1 == #frame then
		nameStart = 1
	end
	parts.name = mw.text.trim( frame:sub( nameStart, ( frame:find( '[,%[]', nameStart ) or 0 ) - 1 ) )
 
	parts.num = math.floor( frame:match( ',%s*(%d+)' ) or 0 )
	if parts.num == 0 then
		parts.num = nil
	end
 
	parts.text = frame:match( '%[%s*([^%]]+)%s*%]$' )
 
	return parts
end
 
return p

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