83 lines
1.6 KiB
Lua
83 lines
1.6 KiB
Lua
---@class core.object
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---@field super core.object
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local Object = {}
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Object.__index = Object
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---Can be overrided by child objects to implement a constructor.
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function Object:new() end
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---@return core.object
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function Object:extend()
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local cls = {}
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for k, v in pairs(self) do
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if k:find("__") == 1 then
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cls[k] = v
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end
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end
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cls.__index = cls
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cls.super = self
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setmetatable(cls, self)
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return cls
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end
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---Check if the object is strictly of the given type.
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---@param T any
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---@return boolean
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function Object:is(T)
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return getmetatable(self) == T
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end
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---Check if the parameter is strictly of the object type.
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---@param T any
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---@return boolean
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function Object:is_class_of(T)
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return getmetatable(T) == self
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end
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---Check if the object inherits from the given type.
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---@param T any
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---@return boolean
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function Object:extends(T)
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local mt = getmetatable(self)
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while mt do
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if mt == T then
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return true
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end
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mt = getmetatable(mt)
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end
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return false
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end
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---Check if the parameter inherits from the object.
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---@param T any
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---@return boolean
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function Object:is_extended_by(T)
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local mt = getmetatable(T)
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while mt do
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if mt == self then
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return true
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end
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local _mt = getmetatable(T)
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if mt == _mt then break end
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mt = _mt
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end
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return false
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end
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---Metamethod to get a string representation of an object.
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---@return string
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function Object:__tostring()
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return "Object"
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end
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---Metamethod to allow using the object call as a constructor.
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---@return core.object
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function Object:__call(...)
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local obj = setmetatable({}, self)
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obj:new(...)
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return obj
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end
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return Object
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