1 ! Copyright (C) 2004, 2008 Slava Pestov.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: accessors arrays definitions assocs kernel kernel.private
4 slots.private namespaces make sequences strings words vectors
5 math 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
13 SYMBOL: next-method-quot-cache
16 H{ } clone class<=-cache set
17 H{ } clone class-not-cache set
18 H{ } clone classes-intersect-cache set
19 H{ } clone class-and-cache set
20 H{ } clone class-or-cache set
21 H{ } clone next-method-quot-cache set ;
24 class<=-cache get clear-assoc
25 class-not-cache get clear-assoc
26 classes-intersect-cache get clear-assoc
27 class-and-cache get clear-assoc
28 class-or-cache get clear-assoc
29 next-method-quot-cache get clear-assoc ;
33 SYMBOL: implementors-map
35 PREDICATE: class < word "class" word-prop ;
37 : classes ( -- seq ) implementors-map get keys ;
39 : predicate-word ( word -- predicate )
40 [ name>> "?" append ] [ vocabulary>> ] bi create ;
42 PREDICATE: predicate < word "predicating" word-prop >boolean ;
44 M: predicate reset-word
45 [ call-next-method ] [ { "predicating" } reset-props ] bi ;
47 : define-predicate ( class quot -- )
48 [ "predicate" word-prop first ] dip
49 (( object -- ? )) define-declared ;
51 : superclass ( class -- super )
52 #! Output f for non-classes to work with algebra code
53 dup class? [ "superclass" word-prop ] [ drop f ] if ;
55 : superclasses ( class -- supers )
56 [ superclass ] follow reverse ;
58 : members ( class -- seq )
59 #! Output f for non-classes to work with algebra code
60 dup class? [ "members" word-prop ] [ drop f ] if ;
62 : participants ( class -- seq )
63 #! Output f for non-classes to work with algebra code
64 dup class? [ "participants" word-prop ] [ drop f ] if ;
66 GENERIC: rank-class ( class -- n )
68 GENERIC: reset-class ( class -- )
80 M: word reset-class drop ;
82 GENERIC: implementors ( class/classes -- seq )
85 : class-uses ( class -- seq )
89 [ superclass [ , ] when* ]
93 : class-usage ( class -- seq ) update-map get at ;
95 : class-usages ( class -- seq ) [ class-usage ] closure keys ;
99 : update-map+ ( class -- )
100 dup class-uses update-map get add-vertex ;
102 : update-map- ( class -- )
103 dup class-uses update-map get remove-vertex ;
105 M: class implementors implementors-map get at keys ;
107 M: sequence implementors [ implementors ] gather ;
109 : implementors-map+ ( class -- )
110 H{ } clone swap implementors-map get set-at ;
112 : implementors-map- ( class -- )
113 implementors-map get delete-at ;
115 : make-class-props ( superclass members participants metaclass -- assoc )
118 [ dup [ bootstrap-word ] when "superclass" set ]
119 [ [ bootstrap-word ] map "members" set ]
120 [ [ bootstrap-word ] map "participants" set ]
125 : (define-class) ( word props -- )
127 dup class? [ dup [ implementors-map+ ] [ new-class ] bi ] unless
129 dup deferred? [ dup define-symbol ] when
132 ] dip assoc-union >>props
134 [ 1quotation "predicate" set-word-prop ]
135 [ swap "predicating" set-word-prop ]
136 [ drop t "class" set-word-prop ]
141 GENERIC: update-class ( class -- )
143 M: class update-class drop ;
145 GENERIC: update-methods ( class seq -- )
147 : update-classes ( class -- )
149 [ nip [ update-class ] each ] [ update-methods ] 2bi ;
151 : define-class ( word superclass members participants metaclass -- )
152 #! If it was already a class, update methods after.
160 : forget-predicate ( class -- )
161 dup "predicate" word-prop
164 tuck "predicating" word-prop =
165 [ forget ] [ drop ] if
168 : forget-methods ( class -- )
169 [ implementors ] [ [ swap 2array ] curry ] bi map forget-all ;
171 GENERIC: class-forgotten ( use class -- )
173 : forget-class ( class -- )
175 [ dup class-usage keys [ class-forgotten ] with each ]
178 [ implementors-map- ]
184 M: class class-forgotten
187 M: class forget* ( class -- )
188 [ call-next-method ] [ forget-class ] bi ;
190 GENERIC: class ( object -- class )
192 GENERIC: instance? ( object class -- ? ) flushable