47 lines
1.3 KiB
Factor
47 lines
1.3 KiB
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
|
|
|
|
! The class slot has to be a union of a word and a classoid
|
|
! for TUPLE: foo { a maybe{ foo } } ; and maybe{ union{ integer float } }
|
|
! to work.
|
|
! In the first case, foo is not yet a tuple-class when maybe{ is reached,
|
|
! thus it's not a classoid yet. union{ is a classoid, so the second case works.
|
|
! words are not generally classoids, so classoid alone is insufficient.
|
|
TUPLE: maybe { class union{ word 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 valid-classoid? class>> valid-classoid? ;
|
|
|
|
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 ;
|