30 lines
772 B
Factor
30 lines
772 B
Factor
! Copyright (C) 2004, 2007 Slava Pestov.
|
|
! See http://factorcode.org/license.txt for BSD license.
|
|
USING: classes classes.union words kernel sequences ;
|
|
IN: classes.mixin
|
|
|
|
PREDICATE: union-class mixin-class "mixin" word-prop ;
|
|
|
|
M: mixin-class reset-class
|
|
{ "metaclass" "members" "mixin" } reset-props ;
|
|
|
|
: redefine-mixin-class ( class members -- )
|
|
dupd define-union-class
|
|
t "mixin" set-word-prop ;
|
|
|
|
: define-mixin-class ( class -- )
|
|
dup mixin-class? [
|
|
drop
|
|
] [
|
|
{ } redefine-mixin-class
|
|
] if ;
|
|
|
|
: add-mixin-instance ( class mixin -- )
|
|
dup mixin-class? [ "Not a mixin class" throw ] unless
|
|
2dup members memq? [
|
|
2drop
|
|
] [
|
|
[ members swap bootstrap-word add ] keep swap
|
|
redefine-mixin-class
|
|
] if ;
|