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 words.symbol
5 vectors math quotations combinators sorting effects graphs
10 SYMBOL: class-not-cache
11 SYMBOL: classes-intersect-cache
12 SYMBOL: class-and-cache
13 SYMBOL: class-or-cache
14 SYMBOL: next-method-quot-cache
17 H{ } clone class<=-cache set
18 H{ } clone class-not-cache set
19 H{ } clone classes-intersect-cache set
20 H{ } clone class-and-cache set
21 H{ } clone class-or-cache set
22 H{ } clone next-method-quot-cache set ;
25 class<=-cache get clear-assoc
26 class-not-cache get clear-assoc
27 classes-intersect-cache get clear-assoc
28 class-and-cache get clear-assoc
29 class-or-cache get clear-assoc
30 next-method-quot-cache get clear-assoc ;
34 SYMBOL: implementors-map
36 PREDICATE: class < word "class" word-prop ;
38 : classes ( -- seq ) implementors-map get keys ;
40 : predicate-word ( word -- predicate )
41 [ name>> "?" append ] [ vocabulary>> ] bi create ;
43 PREDICATE: predicate < word "predicating" word-prop >boolean ;
46 [ call-next-method ] [ f "predicating" set-word-prop ] bi ;
48 M: predicate reset-word
49 [ call-next-method ] [ f "predicating" set-word-prop ] bi ;
51 : define-predicate ( class quot -- )
52 [ "predicate" word-prop first ] dip
53 (( object -- ? )) define-declared ;
55 : superclass ( class -- super )
56 #! Output f for non-classes to work with algebra code
57 dup class? [ "superclass" word-prop ] [ drop f ] if ;
59 : superclasses ( class -- supers )
60 [ superclass ] follow reverse ;
62 : members ( class -- seq )
63 #! Output f for non-classes to work with algebra code
64 dup class? [ "members" word-prop ] [ drop f ] if ;
66 : participants ( class -- seq )
67 #! Output f for non-classes to work with algebra code
68 dup class? [ "participants" word-prop ] [ drop f ] if ;
70 GENERIC: rank-class ( class -- n )
72 GENERIC: reset-class ( class -- )
84 M: word reset-class drop ;
86 GENERIC: implementors ( class/classes -- seq )
89 : class-uses ( class -- seq )
93 [ superclass [ , ] when* ]
97 : class-usage ( class -- seq ) update-map get at ;
99 : class-usages ( class -- seq ) [ class-usage ] closure keys ;
103 : update-map+ ( class -- )
104 dup class-uses update-map get add-vertex ;
106 : update-map- ( class -- )
107 dup class-uses update-map get remove-vertex ;
109 M: class implementors implementors-map get at keys ;
111 M: sequence implementors [ implementors ] gather ;
113 : implementors-map+ ( class -- )
114 H{ } clone swap implementors-map get set-at ;
116 : implementors-map- ( class -- )
117 implementors-map get delete-at ;
119 : make-class-props ( superclass members participants metaclass -- assoc )
122 [ dup [ bootstrap-word ] when "superclass" set ]
123 [ [ bootstrap-word ] map "members" set ]
124 [ [ bootstrap-word ] map "participants" set ]
129 : (define-class) ( word props -- )
131 dup class? [ dup [ implementors-map+ ] [ new-class ] bi ] unless
133 dup deferred? [ dup define-symbol ] when
136 ] dip assoc-union >>props
138 [ 1quotation "predicate" set-word-prop ]
139 [ swap "predicating" set-word-prop ]
140 [ drop t "class" set-word-prop ]
145 GENERIC: update-class ( class -- )
147 M: class update-class drop ;
149 GENERIC: update-methods ( class seq -- )
151 : update-classes ( class -- )
153 [ nip [ update-class ] each ] [ update-methods ] 2bi ;
155 : define-class ( word superclass members participants metaclass -- )
156 #! If it was already a class, update methods after.
164 : forget-predicate ( class -- )
165 dup "predicate" word-prop
168 [ nip ] [ "predicating" word-prop = ] 2bi
169 [ forget ] [ drop ] if
172 : forget-methods ( class -- )
173 [ implementors ] [ [ swap 2array ] curry ] bi map forget-all ;
175 GENERIC: class-forgotten ( use class -- )
177 : forget-class ( class -- )
179 [ dup class-usage keys [ class-forgotten ] with each ]
182 [ implementors-map- ]
188 M: class class-forgotten
191 M: class forget* ( class -- )
192 [ call-next-method ] [ forget-class ] bi ;
194 GENERIC: class ( object -- class )
196 GENERIC: instance? ( object class -- ? ) flushable