1 ! Copyright (C) 2004, 2008 Slava Pestov.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: arrays definitions assocs kernel kernel.private
4 slots.private namespaces sequences strings words vectors math
5 quotations combinators sorting effects graphs vocabs ;
9 SYMBOL: class-not-cache
10 SYMBOL: classes-intersect-cache
11 SYMBOL: class-and-cache
12 SYMBOL: class-or-cache
15 H{ } clone class<=-cache set
16 H{ } clone class-not-cache set
17 H{ } clone classes-intersect-cache set
18 H{ } clone class-and-cache set
19 H{ } clone class-or-cache set ;
22 class<=-cache get clear-assoc
23 class-not-cache get clear-assoc
24 classes-intersect-cache get clear-assoc
25 class-and-cache get clear-assoc
26 class-or-cache get clear-assoc ;
30 PREDICATE: class < word
33 PREDICATE: tuple-class < class
34 "metaclass" word-prop tuple-class eq? ;
36 : classes ( -- seq ) all-words [ class? ] filter ;
38 : predicate-word ( word -- predicate )
39 [ word-name "?" append ] keep word-vocabulary create ;
41 : predicate-effect T{ effect f 1 { "?" } } ;
43 PREDICATE: predicate < word "predicating" word-prop >boolean ;
45 : define-predicate ( class quot -- )
46 >r "predicate" word-prop first
47 r> predicate-effect define-declared ;
49 : superclass ( class -- super )
50 #! Output f for non-classes to work with algebra code
51 dup class? [ "superclass" word-prop ] [ drop f ] if ;
53 : superclasses ( class -- supers )
54 [ superclass ] follow reverse ;
56 : members ( class -- seq )
57 #! Output f for non-classes to work with algebra code
58 dup class? [ "members" word-prop ] [ drop f ] if ;
60 : participants ( class -- seq )
61 #! Output f for non-classes to work with algebra code
62 dup class? [ "participants" word-prop ] [ drop f ] if ;
64 GENERIC: rank-class ( class -- n )
66 GENERIC: reset-class ( class -- )
68 M: word reset-class drop ;
71 : class-uses ( class -- seq )
75 [ superclass [ , ] when* ]
79 : class-usages ( class -- assoc )
80 [ update-map get at ] closure ;
84 : update-map+ ( class -- )
85 dup class-uses update-map get add-vertex ;
87 : update-map- ( class -- )
88 dup class-uses update-map get remove-vertex ;
90 : make-class-props ( superclass members participants metaclass -- assoc )
93 [ dup [ bootstrap-word ] when "superclass" set ]
94 [ [ bootstrap-word ] map "members" set ]
95 [ [ bootstrap-word ] map "participants" set ]
100 : (define-class) ( word props -- )
103 dup class? [ dup new-class ] unless
104 dup deferred? [ dup define-symbol ] when
106 r> assoc-union over set-word-props
108 [ 1quotation "predicate" set-word-prop ]
109 [ swap "predicating" set-word-prop ]
110 [ drop t "class" set-word-prop ]
115 GENERIC: update-class ( class -- )
117 M: class update-class drop ;
119 GENERIC: update-methods ( class assoc -- )
121 : update-classes ( class -- )
123 [ nip keys [ update-class ] each ]
127 : define-class ( word superclass members participants metaclass -- )
128 #! If it was already a class, update methods after.
136 GENERIC: class ( object -- class )
138 : instance? ( obj class -- ? )
139 "predicate" word-prop call ;