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--[[
Copyright (c) 2012 Kaarle Ritvanen
See LICENSE file for license details
--]]
module(..., package.seeall)
function class(base)
local cls = {}
local mt = {
__call=function(self, ...)
local obj = {}
setmetatable(obj, {__index=cls, class=cls})
obj:init(unpack(arg))
return obj
end
}
if not base and Object then base = Object end
if base then
cls._base = base
mt.__index = base
end
return setmetatable(cls, mt)
end
Object = class()
function Object:init(...) end
function super(obj, cls)
assert(isinstance(obj, cls))
local mt = {}
function mt.__index(t, k)
local v = cls._base[k]
if type(v) ~= 'function' then return v end
return function(...)
arg[1] = obj
return v(unpack(arg))
end
end
return setmetatable({}, mt)
end
function issubclass(cls1, cls2)
if cls1 == cls2 then return true end
if cls1._base then return issubclass(cls1._base, cls2) end
return false
end
function isinstance(obj, cls)
if not obj or type(obj) ~= 'table' then return false end
local mt = getmetatable(obj)
if not mt then return false end
return type(obj) == 'table' and mt.class and issubclass(mt.class, cls)
end
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