Language features: mixins

I'm puzzled about importObject(). As Patrick described, it seems to
behave like the 1.5 "import static". It makes the methods and attributes
of an instance available without requiring a qualifying reference to the
instance in the scope to which the importObject() applies. This does not
seem like mixins to me. 

My understanding of mixins is providing the functionality that an object
supports in its external interface via composition of instances of
objects that provide part of the interface. The best example I've seen
of this in the java world is the "Jamie" preprocessor, which seems to
have disappeared. Beanshell's importObject() doesn't support exporting
the interface of the imported object. 

Is there something in the works that will do this?


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Today's Topics:

   1. RE: language extensions? future direction? (Yemi D. Bedu)

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Message: 1
Subject: RE: [Beanshell-dev] language extensions? future direction?
Date: Mon, 29 Nov 2004 19:19:58 -0500
From: "Yemi D. Bedu" <yemi-DnQzskBZRmpWk0Htik3J/[email protected]>
To: "Patrick Niemeyer" <[email protected]>
Cc: <beanshell-developers-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>

Hello,
 I was wondering in such a case as the "macros" would that allow for =
memory of how an operator worked in parent or peer code. Something like
= if to classes are instanced, would they have there own version of the
= syntax tree and know the "for" or "while" loop will actually work as =
expected. That would seem to heavily bloat memory use for many small =
scripts running and even possibly slow its performance a tad on loading
= and changing execution against a syntax tree.

-----Original Message-----
From: beanshell-developers-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org =
[mailto:beanshell-developers-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org] On Behalf Of =
Patrick Niemeyer
Sent: Friday, November 26, 2004 8:24 PM
To: Victor Volle
Cc: beanshell-developers-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
Subject: Re: [Beanshell-dev] language extensions? future direction?


On Nov 26, 2004, at 5:37 AM, Victor Volle wrote:

>  1. "blocks" like in Ruby or Smalltalk: A code block that is used as
>     a parameter of a function, which the function then might call.
>     Ruby'ish example:

Hi, we have discussed adding blocks in some way to the language and=20
I've posted some speculative emails about syntax to the list...
Blocks=20 in some form would be useful and I'm sure we'll add them after
the=20 current version is stable... whenever that is ;)

>  2. "mixins" Yes, multiple inheritance is dangerous, and mixins
>     introduce a kind of multiple inheritance, but they come in handy
>     when needed. Imagine that you have multiple classes, that must
>     implement an Observer interface, but you can not use a common

I'm not sure if it's sufficient, but in 2.x we've added a mixing=20
capability called importObject() that parallels the Java 1.5 static=20
import functionality but for instance methods and vars... I think
this=20 is what you want.

>  4. "macros" =E0 la Lisp. I never really liked Lisp, but one feature
>     was really great: The macro mechanism as part of the language.
>     (In Smalltalk you could do similiar stuff, when I remember

I'm not sure in it's current incarnation BeanShell's grammar parsing
is=20 sufficient to allow such things...  There is currently all kinds
of=20 opportunity though to add hooks to the built in language
features...=20 I'm thinking of things like a hook to execute arbitrary
code in place=20 of the current ASTs (syntax elements) or to trigger
things on variables=20 changing, etc...  more procedural stuff related
to the current=20 language.  To really make the grammar dynamic is an
interesting topic=20 and something I've looked at a lot in the past...
but probably not a=20 good addition to BeanShell any time soon...  might
be another project. =20 But I'm open to hearing ideas.

Again, the people on the list would get very upset at the idea of=20
adding much new stuff before getting the current version solid and
bug=20 free ;)


Pat


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