Re: creating a new module as an extention of another module

[PA <petite.abeille@...>]

On Mar 31, 2006, at 17:27, david herviou wrote:

> I think it's now very clean with this new package module system but I 
> have a question on how to do a module
> that is an extension of an another module?

Here is another variation on module and inheritance:

function extends( aSuper )
        if type( aSuper ) == "string" then
                aSuper = require( aSuper )
        end

        aSuper = aSuper or { __index = _G }

        return function( aClass )
                setmetatable( aClass, aSuper )
                aClass.__index = aClass

                aClass.self = aClass
                aClass.super = aSuper

                return aClass
        end
end

-- define the root class
module( "Object", extends() )

function self:doIt()
        return "do it"
end

-- define a subclass
module( "MyObject", extends( "Object" ) )

function self:doIt()
        return "about to " .. super.doIt( self )
end

-- define another subclass
module( "MyOtherObject", extends( "MyObject" ) )

function self:doIt()
        return super.doIt( self ) .. " well"
end

print( self:doIt() )

> about to do it well

Cheers

--
PA, Onnay Equitursay
http://alt.textdrive.com/