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 sets ;
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 SYMBOL: implementors-map
32 PREDICATE: class < word
35 PREDICATE: tuple-class < class
36 "metaclass" word-prop tuple-class eq? ;
38 : classes ( -- seq ) implementors-map get keys ;
40 : predicate-word ( word -- predicate )
41 [ word-name "?" append ] keep word-vocabulary create ;
43 PREDICATE: predicate < word "predicating" word-prop >boolean ;
45 : define-predicate ( class quot -- )
46 >r "predicate" word-prop first
47 r> (( object -- ? )) 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 -- )
77 M: word reset-class drop ;
79 GENERIC: implementors ( class/classes -- seq )
82 : class-uses ( class -- seq )
86 [ superclass [ , ] when* ]
90 : class-usages ( class -- seq )
91 [ update-map get at ] closure keys ;
95 : update-map+ ( class -- )
96 dup class-uses update-map get add-vertex ;
98 : update-map- ( class -- )
99 dup class-uses update-map get remove-vertex ;
101 M: class implementors implementors-map get at keys ;
103 M: sequence implementors [ implementors ] gather ;
105 : implementors-map+ ( class -- )
106 H{ } clone swap implementors-map get set-at ;
108 : implementors-map- ( class -- )
109 implementors-map get delete-at ;
111 : make-class-props ( superclass members participants metaclass -- assoc )
114 [ dup [ bootstrap-word ] when "superclass" set ]
115 [ [ bootstrap-word ] map "members" set ]
116 [ [ bootstrap-word ] map "participants" set ]
121 : (define-class) ( word props -- )
123 dup class? [ dup [ implementors-map+ ] [ new-class ] bi ] unless
125 dup deferred? [ dup define-symbol ] when
127 r> assoc-union over set-word-props
129 [ 1quotation "predicate" set-word-prop ]
130 [ swap "predicating" set-word-prop ]
131 [ drop t "class" set-word-prop ]
136 GENERIC: update-class ( class -- )
138 M: class update-class drop ;
140 GENERIC: update-methods ( class seq -- )
142 : update-classes ( class -- )
144 [ nip [ update-class ] each ] [ update-methods ] 2bi ;
146 : define-class ( word superclass members participants metaclass -- )
147 #! If it was already a class, update methods after.
155 : forget-predicate ( class -- )
156 dup "predicate" word-prop
159 tuck "predicating" word-prop =
160 [ forget ] [ drop ] if
163 : forget-methods ( class -- )
164 [ implementors ] [ [ swap 2array ] curry ] bi map forget-all ;
166 : forget-class ( class -- )
171 [ implementors-map- ]
177 M: class forget* ( class -- )
178 [ forget-class ] [ call-next-method ] bi ;
180 GENERIC: class ( object -- class )
182 : instance? ( obj class -- ? )
183 "predicate" word-prop call ;