1 ! Copyright (C) 2004, 2010 Slava Pestov.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: accessors assocs combinators definitions kernel
4 make namespaces quotations sequences sets words words.symbol ;
7 ERROR: bad-inheritance class superclass ;
9 PREDICATE: class < word "class" word-prop ;
11 PREDICATE: defining-class < word "defining-class" word-prop ;
14 INSTANCE: class classoid
15 INSTANCE: defining-class classoid
20 SYMBOL: class-not-cache
21 SYMBOL: classes-intersect-cache
22 SYMBOL: class-and-cache
23 SYMBOL: class-or-cache
24 SYMBOL: next-method-quot-cache
27 H{ } clone class<=-cache set
28 H{ } clone class-not-cache set
29 H{ } clone classes-intersect-cache set
30 H{ } clone class-and-cache set
31 H{ } clone class-or-cache set
32 H{ } clone next-method-quot-cache set ;
35 class<=-cache get clear-assoc
36 class-not-cache get clear-assoc
37 classes-intersect-cache get clear-assoc
38 class-and-cache get clear-assoc
39 class-or-cache get clear-assoc
40 next-method-quot-cache get clear-assoc ;
44 SYMBOL: implementors-map
46 GENERIC: class-name ( class -- string )
48 M: class class-name name>> ;
50 GENERIC: rank-class ( class -- n )
52 GENERIC: reset-class ( class -- )
65 M: word reset-class drop ;
69 : classes ( -- seq ) implementors-map get keys ;
71 PREDICATE: predicate < word "predicating" word-prop >boolean ;
73 : create-predicate-word ( word -- predicate )
74 [ name>> "?" append ] [ vocabulary>> ] bi create-word
75 dup predicate? [ dup reset-generic ] unless ;
77 GENERIC: class-of ( object -- class )
79 GENERIC: instance? ( object class -- ? ) flushable
81 GENERIC: predicate-def ( obj -- quot )
84 "predicate" word-prop ;
86 M: object predicate-def
89 : predicate-word ( word -- predicate )
92 M: predicate flushable? drop t ;
95 [ call-next-method ] [ f "predicating" set-word-prop ] bi ;
97 M: predicate reset-word
98 [ call-next-method ] [ f "predicating" set-word-prop ] bi ;
100 : define-predicate ( class quot -- )
101 [ predicate-word ] dip ( object -- ? ) define-declared ;
103 : superclass-of ( class -- super )
104 ! Output f for non-classes to work with algebra code
105 dup class? [ "superclass" word-prop ] [ drop f ] if ;
107 : superclasses-of ( class -- supers )
108 [ superclass-of ] follow reverse! ;
110 : superclass-of? ( class superclass -- ? )
111 superclasses-of member-eq? ;
113 : subclass-of? ( class superclass -- ? )
114 swap superclass-of? ;
116 : class-members ( class -- seq )
117 #! Output f for non-classes to work with algebra code
118 dup class? [ "members" word-prop ] [ drop f ] if ;
120 : class-participants ( class -- seq )
121 #! Output f for non-classes to work with algebra code
122 dup class? [ "participants" word-prop ] [ drop f ] if ;
124 GENERIC: implementors ( class/classes -- seq )
127 : class-uses ( class -- seq )
130 [ class-participants % ]
131 [ superclass-of [ , ] when* ]
135 : class-usage ( class -- seq )
136 update-map get at members ;
140 : (closure) ( obj set quot: ( elt -- seq ) -- )
142 [ dip ] keep [ (closure) ] 2curry each
143 ] [ 3drop ] if ; inline recursive
145 : closure ( obj quot -- set )
146 HS{ } clone [ swap (closure) ] keep ; inline
150 : class-usages ( class -- seq )
151 [ class-usage ] closure members ;
153 M: class implementors implementors-map get at members ;
155 M: sequence implementors [ implementors ] gather ;
159 : update-map+ ( class -- )
160 dup class-uses update-map get
161 [ adjoin-at ] curry with each ;
163 : update-map- ( class -- )
164 dup class-uses update-map get
165 [ at delete ] curry with each ;
167 : implementors-map+ ( class -- )
168 [ HS{ } clone ] dip implementors-map get set-at ;
170 : implementors-map- ( class -- )
171 implementors-map get delete-at ;
173 : make-class-props ( superclass members participants metaclass -- assoc )
176 [ dup [ bootstrap-word ] when "superclass" ,, ]
177 [ [ bootstrap-word ] map "members" ,, ]
178 [ [ bootstrap-word ] map "participants" ,, ]
183 GENERIC: metaclass-changed ( use class -- )
185 : ?metaclass-changed ( class usages/f -- )
186 [ [ metaclass-changed ] with each ] [ drop ] if* ;
188 : check-metaclass ( class metaclass -- usages/f )
190 over "metaclass" word-prop eq?
191 [ drop f ] [ class-usage ] if
194 : ?define-symbol ( word -- )
195 dup deferred? [ define-symbol ] [ drop ] if ;
197 : (define-class) ( word props -- )
199 2dup "metaclass" of check-metaclass
201 [ 2drop update-map- ]
202 [ 2drop dup class? [ reset-class ] [ implementors-map+ ] if ]
203 [ 2drop ?define-symbol ]
204 [ drop [ assoc-union ] curry change-props drop ]
207 dup create-predicate-word
208 [ 1quotation "predicate" set-word-prop ]
209 [ swap "predicating" set-word-prop ]
212 [ 2drop t "class" set-word-prop ]
213 [ 2drop update-map+ ]
214 [ nip ?metaclass-changed ]
217 GENERIC: update-class ( class -- )
219 M: class update-class drop ;
221 GENERIC: update-methods ( class seq -- )
223 : update-classes ( class -- )
225 [ nip [ update-class ] each ] [ update-methods ] 2bi ;
227 : check-inheritance ( subclass superclass -- )
228 2dup superclass-of? [ throw-bad-inheritance ] [ 2drop ] if ;
230 : define-class ( word superclass members participants metaclass -- )
231 [ 2dup check-inheritance ] 3dip
232 make-class-props [ (define-class) ] [ drop changed-definition ] 2bi ;
234 : forget-predicate ( class -- )
238 [ nip ] [ "predicating" word-prop = ] 2bi
239 [ forget ] [ drop ] if
242 GENERIC: forget-methods ( class -- )
246 : forget-class ( class -- )
247 dup f check-metaclass {
248 [ drop forget-predicate ]
249 [ drop forget-methods ]
250 [ drop implementors-map- ]
253 [ 2drop reset-caches ]
254 [ ?metaclass-changed ]
257 M: class metaclass-changed
258 swap class? [ drop ] [ forget-class ] if ;
260 M: class forget* ( class -- )
261 [ call-next-method ] [ forget-class ] bi ;