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local p = {}
 
local i18n = {
	filename = '$1',
	legacyFilename = '$1.png',
	modLink = 'Mods/$1/$2',
	moduleAliases = [[Module:Inventory slot/Aliases]],
	moduleInvIds = [[Module:InvSprite/IDs]],
	moduleModIds = 'Module:InvSprite/Mods/$1/IDs',
	moduleRandom = [[Module:Random]],
	moduleSprite = [[Module:Sprite]],
	-- List of special prefixes which should be handled by
	-- other modules (such as being moved outside links)
	prefixes = {
		'Any',
		'Matching',
		'Damaged',
		any = 'Any',
		matching = 'Matching',
		damaged = 'Damaged',
	},
	templateFileUrl = 'FileUrl',
}
p.i18n = i18n
p.prefixes = i18n.prefixes
 
local random = require( i18n.moduleRandom ).random
local sprite = require( i18n.moduleSprite ).sprite
local aliases = mw.loadData( i18n.moduleAliases )
local ids = mw.loadData( i18n.moduleInvIds ).ids
local modIds = {}
local pageName = mw.title.getCurrentTitle().text
 
-- Performs a simple recursive clone of a table's values
local function cloneTable( origTable )
	local newTable = {}
	for k, v in pairs( origTable ) do
		if type( v ) == 'table' then
			v = cloneTable( v )
		end
		newTable[k] = v
	end
	return newTable
end
 
--[[Merges a list, or inserts a string
	or table into a table
--]]
local function mergeList( parentTable, content )
	local i = #parentTable + 1
	if content[1] then
		-- Merge list into table
		for _, v in ipairs( content ) do
			parentTable[i] = v
			i = i + 1
		end
	else
		-- Add strings or tables to table
		parentTable[i] = content
	end
end
 
-- Creates the HTML for an item
local function makeItem( frame, i, args )
	local item = mw.html.create( 'span' ):addClass( 'invslot-item' )
	if args.imgclass then
		item:addClass( args.imgclass )
	end
	if frame.name == '' then
		item:tag( 'br' )
		return item
	end
	local category
	local title = frame.title or mw.text.trim( args.title or '' )
	local mod = frame.mod
	local name = frame.name or ''
	local num = frame.num
	local description = frame.text
 
	local img, idData
	if mod then
		local modData = modIds[mod]
		if not modData and mw.title.new( i18n.moduleModIds:gsub( '%$1', mod ) ).exists then
			modData = mw.loadData( i18n.moduleModIds:gsub( '%$1', mod ) )
			modIds[mod] = modData
		end
		if modData and modData[name] then
			idData = modData[name]
		else
			img = i18n.legacyFilename:gsub( '%$1', name .. ' (' .. mod .. ')' )
		end
	elseif ids[name] then
		idData = ids[name]
	elseif name:match( '\.gif$' ) or name:match( '\.png$' ) then
		img = i18n.filename:gsub( '%$1', name )
		-- Remove file extension from name
		name = name:sub( 0, -5 )
	else
		img = i18n.legacyFilename:gsub( '%$1', name )
	end
 
	local link = args.link or ''
	if link == '' then
		if mod then
			link = i18n.modLink:gsub( '%$1', mod ):gsub( '%$2', name )
		else
			link = name:gsub( '^' .. i18n.prefixes.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-pr]'
		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:', img, '|32x32px|link=', link or '', '|', escapedTitle, ']]' )
	else
		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 )
	    :addClass( 'item_overlay' )
	return item
 
end
 
-- Main entry point
function p.slot( f )
	local args = f.args or f
	if f == mw.getCurrentFrame() and args[1] == nil then
		args = f:getParent().args
	end
 
	if not args.parsed then
		args[1] = mw.text.trim( args[1] or '' )
	end
 
	local modData = {
		aliases = args.modaliases or '',
		default = args.mod
	}
	if modData.aliases ~= '' then
		modData.aliases = mw.loadData( 'Module:' .. modData.aliases )
	else
		modData.aliases = nil
	end
	if args.mod == '' then
		modData.default = nil
	end
 
	local frames
	if args.parsed then
		frames = args[1]
	elseif args[1] ~= '' then
		local randomise = args.class == 'invslot-large' and 'never' or nil
		frames = p.parseFrameText( args[1], randomise, false, modData )
	end
	local animated = frames and #frames > 1
	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', f:expandTemplate{ title = i18n.templateFileUrl, args = { args.default .. '.png' } } )
	end
 
	--mw.logObject( frames )
	if not frames then
		body:tag( 'br' )
		return tostring( body )
	end
 
	local activeFrame = frames.randomise == true and random( #frames ) or 1
	for i, frame in ipairs( frames ) do
		local item
		-- Table is a list, must contain subframes
		if frame[1] then
			item = body:tag( 'span' ):addClass( 'animated-subframe' )
			local subActiveFrame = frame.randomise and random( #frame ) or 1
			for sI, sFrame in ipairs( frame ) do
				local sItem = makeItem( sFrame, sI, args )
				item:node( sItem )
 
				if sI == subActiveFrame then
					sItem:addClass( 'animated-active' )
				end
			end
		else
			item = makeItem( frame, i, args )
			body:node( item )
		end
		if i == activeFrame and animated then
			item:addClass( 'animated-active' )
		end
	end
 
	return tostring( body )
end
 
--[[Parses the frame text into a table of frames and subframes,
	expanding aliases (and optionally retaining a reference), and
	deciding if the slot can be randomised
--]]
function p.parseFrameText( framesText, randomise, aliasReference, modData )
	local frames = { randomise = randomise }
	local subframes = {}
	local subframe
	local expandedAliases
	local splitFrames = mw.text.split( mw.text.trim( framesText ), '%s*;%s*' )
	for _, frameText in ipairs( splitFrames ) do
		frameText = frameText:gsub( '^%s*{%s*', function()
			subframe = true
			return ''
		end )
		if subframe then
			frameText = frameText:gsub( '%s*}%s*$', function()
				subframe = 'last'
				return ''
			end )
		end
		local frame = p.makeFrame( frameText, modData and modData.default )
		local newFrame = frame
		if aliases or modData.aliases then
			local id = frame.name
			if frame.mod then
				id = frame.mod .. ':' .. id
			end
 
			local alias = modData and modData.aliases and modData.aliases[id] or
				aliases and aliases[id]
			if alias then
				newFrame = p.getAlias( alias, frame )
				if aliasReference then
					local curFrame = #frames + 1
					local aliasData = { frame = frame, length = #newFrame }
					if subframe then
						if not subframes.aliasReference then
							subframes.aliasReference = {}
						end
						subframes.aliasReference[#subframes + 1] = aliasData
					else
						if not expandedAliases then
							expandedAliases = {}
						end
						expandedAliases[curFrame] = aliasData
					end
				end
			end
		end
 
		if subframe then
			mergeList( subframes, newFrame )
			-- Randomise starting frame for "Any *" aliases, as long as the alias is the only subframe
			if frames.randomise ~= 'never' and subframes.randomise == nil and
				frame.name:match( '^' .. i18n.prefixes.any .. ' ' ) then
				subframes.randomise = true
			else
				subframes.randomise = false
			end
			if frames.randomise ~= 'never' then
				frames.randomise = false
			end
			if subframe == 'last' then
				-- No point having a subframe containing a single frame,
				-- or the subframe being the only frame
				if #subframes == 1 or #splitFrames == i and #frames == 0 then
					mergeList( frames, subframes )
				else
					table.insert( frames, subframes )
				end
				subframes = {}
				subframe = nil
			end
		else
			-- Randomise starting frame for "Any *" aliases, as long as the alias is the only frame
			if frames.randomise == nil and frame.name:match( '^' .. i18n.prefixes.any .. ' ' ) then
				frames.randomise = true
			elseif frames.randomise ~= 'never' then
				frames.randomise = false
			end
			mergeList( frames, newFrame )
		end
	end
 
	frames.aliasReference = expandedAliases
 
	return frames
end
 
--[[Returns a new table with the parts of the parent frame
	added to the alias
--]]
function p.getAlias( aliasFrames, parentFrame )
	-- If alias is just a name, return the parent frame with the new name
	if type( aliasFrames ) == 'string' then
		local expandedFrame = mw.clone( parentFrame )
		expandedFrame.name = aliasFrames
		return { expandedFrame }
	end
 
	-- Single frame alias, put in list
	if aliasFrames.name then
		aliasFrames = { aliasFrames }
	end
 
	local expandedFrames = {}
	for i, aliasFrame in ipairs( aliasFrames ) do
		local expandedFrame
		if type( aliasFrame ) == 'string' then
			expandedFrame = { name = aliasFrame }
		else
			expandedFrame = cloneTable( aliasFrame )
		end
		expandedFrame.title = parentFrame.title or expandedFrame.title
		expandedFrame.mod = parentFrame.mod or expandedFrame.mod
		expandedFrame.num = parentFrame.num or expandedFrame.num
		expandedFrame.text = parentFrame.text or expandedFrame.text
 
		expandedFrames[i] = expandedFrame
	end
 
	return expandedFrames
end
 
function p.expandAlias( parentFrame, alias )
	return p.getAlias( alias, parentFrame )
end
 
function p.stringifyFrame( frame )
	if not frame.name then
		return ''
	end
	return string.format(
		'[%s]%s:%s,%s[%s]',
		frame.title or '',
		frame.mod or '',
		frame.name,
		frame.num or '',
		frame.text or ''
	)
end
 
function p.stringifyFrames( frames )
	for i, frame in ipairs( frames ) do
		frames[i] = p.stringifyFrame( frame )
	end
	return table.concat( frames, ';' )
end
 
-- Splits up the frame text into its parts
function p.makeFrame( frameText, mod )
	-- Simple frame with no parts
	if not frameText:match( '[%[:,]' ) then
		return {
			mod = mod,
			name = mw.text.trim( frameText ),
		}
	end
 
	frameText = frameText:gsub( '%s*([%[%]:,;])%s*', '%1' )
 
	local frame = {}
	frame.title = frameText:match( '^%[([^%]]+)%]' )
 
	frame.mod = frameText:match( '([^:%]]+):' ) or mod
	local vanilla = { v = 1, vanilla = 1, mc = 1, minecraft = 1 }
	if frame.mod and vanilla[mw.ustring.lower( frame.mod )] or frame.mod == '' then
		frame.mod = nil
	end
 
	local nameStart = ( frameText:find( ':' ) or frameText:find( '%]' ) or 0 ) + 1
	if nameStart - 1 == #frameText then
		nameStart = 1
	end
	frame.name = frameText:sub( nameStart, ( frameText:find( '[,%[]', nameStart ) or 0 ) - 1 )
 
	frame.num = math.floor( frameText:match( ',(%d+)' ) or 0 )
	if frame.num == 0 then
		frame.num = nil
	end
 
	frame.text = frameText:match( '%[([^%]]+)%]$' )
 
	return frame
end
function p.getParts( frameText, mod )
	return p.makeFrame( frameText, mod )
end
 
return p

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