Moon - Example

local moon = require("moon")

local super = moon.super
local Property = moon.Property
local classmethod = moon.classmethod

local function class(...)
    local c = moon.class(...)
    _ENV[c.__name] = c
    _ENV.C = c
end

class("Food") do
    local C = C -- localize class for super

    function C:__init()
        self:make()
    end

    -- empty since we need a more specific type of food
    function C:make()
    end

    C.taste = Property(
        function(self)
            return 0
        end
    )
end

class("Noodles", Food) do
    local C = C

    function C:__init(cookTime)
        checkArg(1, cookTime, "number")
        self._cookTime = cookTime
        super(C, self).__init(self)
    end

    function C:make()
        super(C, self).make(self)
        print(string.format("cook noodles for %d minutes", self._cookTime))
    end

    C.taste = Property(
        function(self)
            return super(C, self).taste + 10 - math.abs(10 - self._cookTime)
        end
    )
end

class("Sauce", Food) do
    local C = C

    C.sauceTypes = {
        -- the position determines the taste
        "tomato",
        "cheese",
        "meat",
    }

    function C:__init(sauceType, ...)
        if self:getSauceTaste(sauceType) == 0 then
            error("Invalid sauce type", 2)
        end
        self._sauceType = sauceType
        super(C, self).__init(self, ...)
    end

    function C:make()
        super(C, self).make(self)
        print(string.format("cook %s sauce ", self._sauceType))
    end

    C.taste = Property(
        function(self)
            return super(C, self).taste + self:getSauceTaste(self._sauceType)
        end
    )

    -- class method
    C.getSauceTaste = classmethod(
    function(cls, sauceType)
        -- this is inefficient but for this example okay
        for i, ty in ipairs(cls.sauceTypes) do
            if ty == sauceType then
                return i * 10
            end
        end
        return 0
    end)
end

class("Pasta", Sauce, Noodles) do
    local C = C

    function C:make()
        print("cook pasta:")
        super(C, self).make(self)
    end
end

print(Pasta:getSauceTaste("cheese"))
print()

local pasta
pasta = Noodles(15)
print(pasta.taste)
print()

pasta = Pasta("tomato", 5)
print(pasta.taste)
print()

pasta = Pasta("meat", 10)
print(pasta.taste)