Skin.lua

-------------------------------------------------------------------------------
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-- Copyright (c) 2013-2016, Esoteric Software
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local setmetatable = setmetatable
local table_insert = table.insert

local Skin = {}
Skin.__index = Skin

function Skin.new (name)
	if not name then error("name cannot be nil", 2) end

	local self = {
		name = name,
		attachments = {}
	}
	setmetatable(self, Skin)

	return self
end

function Skin:addAttachment (slotIndex, name, attachment)
	if not name then error("name cannot be nil.", 2) end
	if not self.attachments[slotIndex] then self.attachments[slotIndex] = {} end
	self.attachments[slotIndex][name] = attachment
end

function Skin:getAttachment (slotIndex, name)
	if not name then error("name cannot be nil.", 2) end
	local dictionary = self.attachments[slotIndex]
	if dictionary then
		return dictionary[name]
	else
		return nil
	end
end

function Skin:attachAll(skeleton, oldSkin)
	local slotIndex = 0
	for i, slot in ipairs(skeleton.slots) do
		local slotAttachment = slot.attachment
		if slotAttachment and slotIndex <= #oldSkin.attachments then
			local dictionary = oldSkin.attachments[slotIndex]
			for key, value in dictionary do
				local skinAttachment = value
				if slotAttachment == skinAttachment then
					local attachment = getAttachment(slotIndex, key)
					if attachment then slot.attachment = attachment end
					break
				end
			end
		end
		slotIndex = slotIndex + 1
	end
end

function Skin:findNamesForSlot (slotIndex)
	local names = {}
	for k,v in self.attachments do
		if v[1] == slotIndex then table_insert(names, v[2]) end
	end
end

function Skin:findAttachmentsForSlot (slotIndex)
	local attachments = {}
	for k,v in self.attachments do
		if v[1] == slotIndex then table_insert(attachments, v[3]) end
	end
end

return Skin