Support C3

[mercmobily]

Right now, SimpleDeclare seems to do hierarchy linearisation the way the old Python 2.2 used to. There is nothing wrong with it, but the "good" way of doing it seems to be C3 Method Resolution Order (C3MRO).

Here is a good document that explains it all. The only other library that does C3MRO I know about is Dojo's declare.

The relevant code in SimpleDeclare is the part where it goes:

        // NOW:
        // Go through every __proto__ of every derivative class, and augment
        // MixedClass by inheriting from A COPY OF each one of them.

The first cycle gets the full list of constructors:

          // Get the prototype list, in the right order
          // (the reversed discovery order)
          // The result will be placed in `subList`
          var subList = [];    
          proto = SuperCtorList[ i ].prototype;
          while( proto ){
            if( proto.constructor !== Object ) subList.push( proto );
            proto = Object.getPrototypeOf( proto );
          }
          subList = subList.reverse();

Then, the real funk begins... the result must be MixedClass, a constructor with the correctly linearised constructors.

Anybody feeling brave? I would love to see this in SimpleDeclare, but have no urgency for it -- and have already spent MONSTROUS amounts of time on it. It's fully tested (more than 100 tests, if you think of more let me know).

[snowyu]

Thanks for your information, I've just extended a inherits function to solve the single inheritance class. It's compatible with coffee-script.

 inherits(ctor, superCtor)

Now I wanna to solve these problems on mixin(multiple inheritance) class. I find your solution. It's perfect. And almost the same thought: clone each super constructors.

except I would prefer this form:

mixin(ctor, superCtor1, superCtor2, ...);

I think It is more readable:

    class Root
    class A
      inherits A, Root
    class B
      inherits B, Root
    class C
    class D
      inherits D, Root
      mixin D, A, B, C

I do not care about performance very much. I wanna care about more pretty readable.

My mixin code just a work start. more test need. Welcome to point out my stupid.

[mercmobily]

I am very open to make a version of SimpleDeclare that is Coffeescript friendly. However, this ticket is about implementing C3MRO in SimpleDeclare... so maybe let's keep it focussed. Please open a new ticket for Coffeescript support!

[mercmobily]

For your information, about the request you made, things now work the way you described. So, I guess you're good to go. I would love to see #5 solved though, as right now there is automatic calling of all constructors, which is maybe not something others expect. Let me know how it all goes.