39 lines
847 B
Factor
39 lines
847 B
Factor
! Copyright (C) 2011 Doug Coleman.
|
|
! See http://factorcode.org/license.txt for BSD license.
|
|
USING: accessors arrays classes classes.algebra
|
|
classes.algebra.private classes.private classes.union.private
|
|
kernel words ;
|
|
IN: classes.maybe
|
|
|
|
TUPLE: maybe { class classoid initial: object read-only } ;
|
|
|
|
C: <maybe> maybe
|
|
|
|
INSTANCE: maybe classoid
|
|
|
|
M: maybe instance?
|
|
over [ class>> instance? ] [ 2drop t ] if ;
|
|
|
|
: maybe-class-or ( maybe -- classoid )
|
|
class>> \ f class-or ;
|
|
|
|
M: maybe normalize-class
|
|
maybe-class-or ;
|
|
|
|
M: maybe rank-class drop 6 ;
|
|
|
|
M: maybe (flatten-class)
|
|
maybe-class-or (flatten-class) ;
|
|
|
|
M: maybe union-of-builtins?
|
|
class>> union-of-builtins? ;
|
|
|
|
M: maybe class-name
|
|
class>> class-name ;
|
|
|
|
M: maybe predicate-def
|
|
class>> predicate-def [ [ t ] if* ] curry ;
|
|
|
|
M: maybe classes-contained-by
|
|
class>> 1array ;
|