cocos luaはclass解釈を実現する
2294 ワード
function class(classname, ...) -- : , : , function, table,userdata
local cls = {__cname = classname}
local supers = {...}
for _, super in ipairs(supers) do --
local superType = type(super)
if superType == "function" then
-- function, cls create
cls.__create = super
elseif superType == "table" then -- table
if super[".isclass"] then-- cocos , cc.Sprite,
cls.__create = function() return super:create() end
else
-- lua , , a={}
cls.__supers = cls.__supers or {}
cls.__supers[#cls.__supers + 1] = super-- __supers
if not cls.super then
-- table cls
cls.super = super
end
end
end
end
cls.__index = cls--
if not cls.__supers or #cls.__supers == 1 then -- , cls index
setmetatable(cls, {__index = cls.super})
else
setmetatable(cls, {__index = function(_, key)-- ,index ,
local supers = cls.__supers
for i = 1, #supers do
local super = supers[i]
if super[key] then return super[key] end
end
end})
end
if not cls.ctor then
--
cls.ctor = function() end
end
cls.new = function(...) -- ,
local instance
if cls.__create then
-- create , , , cls create 。
-- index, cocos , sprite, sprite:create()
-- , ,
instance = cls.__create(...)
else
instance = {}-- , cocos ,
end
-- , instance index, new , instance index
--
_setmetatableindex(instance, cls)
instance.class = cls
instance:ctor(...)--
return instance
end
cls.create = function(_, ...)
return cls.new(...)
end
return cls
end