1 ! Copyright (C) 2004, 2010 Slava Pestov.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: accessors assocs combinators definitions graphs kernel
4 make namespaces quotations sequences sets words words.symbol ;
5 FROM: namespaces => set ;
8 ERROR: bad-inheritance class superclass ;
10 PREDICATE: class < word "class" word-prop ;
13 INSTANCE: class classoid
18 SYMBOL: class-not-cache
19 SYMBOL: classes-intersect-cache
20 SYMBOL: class-and-cache
21 SYMBOL: class-or-cache
22 SYMBOL: next-method-quot-cache
25 H{ } clone class<=-cache set
26 H{ } clone class-not-cache set
27 H{ } clone classes-intersect-cache set
28 H{ } clone class-and-cache set
29 H{ } clone class-or-cache set
30 H{ } clone next-method-quot-cache set ;
33 class<=-cache get clear-assoc
34 class-not-cache get clear-assoc
35 classes-intersect-cache get clear-assoc
36 class-and-cache get clear-assoc
37 class-or-cache get clear-assoc
38 next-method-quot-cache get clear-assoc ;
42 SYMBOL: implementors-map
44 GENERIC: class-name ( class -- string )
46 M: class class-name name>> ;
48 GENERIC: rank-class ( class -- n )
50 GENERIC: reset-class ( class -- )
62 M: word reset-class drop ;
66 : classes ( -- seq ) implementors-map get keys ;
68 PREDICATE: predicate < word "predicating" word-prop >boolean ;
70 : create-predicate-word ( word -- predicate )
71 [ name>> "?" append ] [ vocabulary>> ] bi create
72 dup predicate? [ dup reset-generic ] unless ;
74 GENERIC: class-of ( object -- class )
76 GENERIC: instance? ( object class -- ? ) flushable
78 GENERIC: predicate-def ( obj -- quot )
81 "predicate" word-prop ;
83 M: object predicate-def
86 : predicate-word ( word -- predicate )
89 M: predicate flushable? drop t ;
92 [ call-next-method ] [ f "predicating" set-word-prop ] bi ;
94 M: predicate reset-word
95 [ call-next-method ] [ f "predicating" set-word-prop ] bi ;
97 : define-predicate ( class quot -- )
98 [ predicate-word ] dip ( object -- ? ) define-declared ;
100 : superclass ( class -- super )
101 #! Output f for non-classes to work with algebra code
102 dup class? [ "superclass" word-prop ] [ drop f ] if ;
104 : superclasses ( class -- supers )
105 [ superclass ] follow reverse! ;
107 : superclass-of? ( class superclass -- ? )
108 superclasses member-eq? ;
110 : subclass-of? ( class superclass -- ? )
111 swap superclass-of? ;
113 : members ( class -- seq )
114 #! Output f for non-classes to work with algebra code
115 dup class? [ "members" word-prop ] [ drop f ] if ;
117 : participants ( class -- seq )
118 #! Output f for non-classes to work with algebra code
119 dup class? [ "participants" word-prop ] [ drop f ] if ;
121 GENERIC: implementors ( class/classes -- seq )
124 : class-uses ( class -- seq )
128 [ superclass [ , ] when* ]
132 : class-usage ( class -- seq ) update-map get at ;
134 : class-usages ( class -- seq ) [ class-usage ] closure keys ;
136 M: class implementors implementors-map get at keys ;
138 M: sequence implementors [ implementors ] gather ;
142 : update-map+ ( class -- )
143 dup class-uses update-map get add-vertex ;
145 : update-map- ( class -- )
146 dup class-uses update-map get remove-vertex ;
148 : implementors-map+ ( class -- )
149 [ H{ } clone ] dip implementors-map get set-at ;
151 : implementors-map- ( class -- )
152 implementors-map get delete-at ;
154 : make-class-props ( superclass members participants metaclass -- assoc )
157 [ dup [ bootstrap-word ] when "superclass" set ]
158 [ [ bootstrap-word ] map "members" set ]
159 [ [ bootstrap-word ] map "participants" set ]
164 GENERIC: metaclass-changed ( use class -- )
166 : ?metaclass-changed ( class usages/f -- )
167 dup [ [ metaclass-changed ] with each ] [ 2drop ] if ;
169 : check-metaclass ( class metaclass -- usages/f )
171 over "metaclass" word-prop eq?
172 [ drop f ] [ class-usage keys ] if
175 : ?define-symbol ( word -- )
176 dup deferred? [ define-symbol ] [ drop ] if ;
178 : (define-class) ( word props -- )
180 2dup "metaclass" swap at check-metaclass
182 [ 2drop update-map- ]
183 [ 2drop dup class? [ reset-class ] [ implementors-map+ ] if ]
184 [ 2drop ?define-symbol ]
185 [ drop [ assoc-union ] curry change-props drop ]
188 dup create-predicate-word
189 [ 1quotation "predicate" set-word-prop ]
190 [ swap "predicating" set-word-prop ]
193 [ 2drop t "class" set-word-prop ]
194 [ 2drop update-map+ ]
195 [ nip ?metaclass-changed ]
198 GENERIC: update-class ( class -- )
200 M: class update-class drop ;
202 GENERIC: update-methods ( class seq -- )
204 : update-classes ( class -- )
206 [ nip [ update-class ] each ] [ update-methods ] 2bi ;
208 : check-inheritance ( subclass superclass -- )
209 2dup superclass-of? [ bad-inheritance ] [ 2drop ] if ;
211 : define-class ( word superclass members participants metaclass -- )
212 [ 2dup check-inheritance ] 3dip
213 make-class-props [ (define-class) ] [ drop changed-definition ] 2bi ;
215 : forget-predicate ( class -- )
219 [ nip ] [ "predicating" word-prop = ] 2bi
220 [ forget ] [ drop ] if
223 GENERIC: forget-methods ( class -- )
227 : forget-class ( class -- )
228 dup f check-metaclass {
229 [ drop forget-predicate ]
230 [ drop forget-methods ]
231 [ drop implementors-map- ]
234 [ 2drop reset-caches ]
235 [ ?metaclass-changed ]
238 M: class metaclass-changed
239 swap class? [ drop ] [ forget-class ] if ;
241 M: class forget* ( class -- )
242 [ call-next-method ] [ forget-class ] bi ;