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 ;
5 FROM: namespaces => set ;
8 ERROR: bad-inheritance class superclass ;
10 PREDICATE: class < word "class" word-prop ;
12 PREDICATE: defining-class < word "defining-class" word-prop ;
15 INSTANCE: class classoid
16 INSTANCE: defining-class classoid
21 SYMBOL: class-not-cache
22 SYMBOL: classes-intersect-cache
23 SYMBOL: class-and-cache
24 SYMBOL: class-or-cache
25 SYMBOL: next-method-quot-cache
28 H{ } clone class<=-cache set
29 H{ } clone class-not-cache set
30 H{ } clone classes-intersect-cache set
31 H{ } clone class-and-cache set
32 H{ } clone class-or-cache set
33 H{ } clone next-method-quot-cache set ;
36 class<=-cache get clear-assoc
37 class-not-cache get clear-assoc
38 classes-intersect-cache get clear-assoc
39 class-and-cache get clear-assoc
40 class-or-cache get clear-assoc
41 next-method-quot-cache get clear-assoc ;
45 SYMBOL: implementors-map
47 GENERIC: class-name ( class -- string )
49 M: class class-name name>> ;
51 GENERIC: rank-class ( class -- n )
53 GENERIC: reset-class ( class -- )
66 M: word reset-class drop ;
70 : classes ( -- seq ) implementors-map get keys ;
72 PREDICATE: predicate < word "predicating" word-prop >boolean ;
74 : create-predicate-word ( word -- predicate )
75 [ name>> "?" append ] [ vocabulary>> ] bi create-word
76 dup predicate? [ dup reset-generic ] unless ;
78 GENERIC: class-of ( object -- class )
80 GENERIC: instance? ( object class -- ? ) flushable
82 GENERIC: predicate-def ( obj -- quot )
85 "predicate" word-prop ;
87 M: object predicate-def
90 : predicate-word ( word -- predicate )
93 M: predicate flushable? drop t ;
96 [ call-next-method ] [ f "predicating" set-word-prop ] bi ;
98 M: predicate reset-word
99 [ call-next-method ] [ f "predicating" set-word-prop ] bi ;
101 : define-predicate ( class quot -- )
102 [ predicate-word ] dip ( object -- ? ) define-declared ;
104 : superclass-of ( class -- super )
105 ! Output f for non-classes to work with algebra code
106 dup class? [ "superclass" word-prop ] [ drop f ] if ;
108 : superclasses-of ( class -- supers )
109 [ superclass-of ] follow reverse! ;
111 : superclass-of? ( class superclass -- ? )
112 superclasses-of member-eq? ;
114 : subclass-of? ( class superclass -- ? )
115 swap superclass-of? ;
117 : class-members ( class -- seq )
118 #! Output f for non-classes to work with algebra code
119 dup class? [ "members" word-prop ] [ drop f ] if ;
121 : class-participants ( class -- seq )
122 #! Output f for non-classes to work with algebra code
123 dup class? [ "participants" word-prop ] [ drop f ] if ;
125 GENERIC: implementors ( class/classes -- seq )
128 : class-uses ( class -- seq )
131 [ class-participants % ]
132 [ superclass-of [ , ] when* ]
136 : class-usage ( class -- seq )
137 update-map get at members ;
141 : (closure) ( obj set quot: ( elt -- seq ) -- )
143 [ dip ] keep [ (closure) ] 2curry each
144 ] [ 3drop ] if ; inline recursive
146 : closure ( obj quot -- set )
147 HS{ } clone [ swap (closure) ] keep ; inline
151 : class-usages ( class -- seq )
152 [ class-usage ] closure members ;
154 M: class implementors implementors-map get at members ;
156 M: sequence implementors [ implementors ] gather ;
160 : update-map+ ( class -- )
161 dup class-uses update-map get
162 [ adjoin-at ] curry with each ;
164 : update-map- ( class -- )
165 dup class-uses update-map get
166 [ at delete ] curry with each ;
168 : implementors-map+ ( class -- )
169 [ HS{ } clone ] dip implementors-map get set-at ;
171 : implementors-map- ( class -- )
172 implementors-map get delete-at ;
174 : make-class-props ( superclass members participants metaclass -- assoc )
177 [ dup [ bootstrap-word ] when "superclass" ,, ]
178 [ [ bootstrap-word ] map "members" ,, ]
179 [ [ bootstrap-word ] map "participants" ,, ]
184 GENERIC: metaclass-changed ( use class -- )
186 : ?metaclass-changed ( class usages/f -- )
187 [ [ metaclass-changed ] with each ] [ drop ] if* ;
189 : check-metaclass ( class metaclass -- usages/f )
191 over "metaclass" word-prop eq?
192 [ drop f ] [ class-usage ] if
195 : ?define-symbol ( word -- )
196 dup deferred? [ define-symbol ] [ drop ] if ;
198 : (define-class) ( word props -- )
200 2dup "metaclass" of check-metaclass
202 [ 2drop update-map- ]
203 [ 2drop dup class? [ reset-class ] [ implementors-map+ ] if ]
204 [ 2drop ?define-symbol ]
205 [ drop [ assoc-union ] curry change-props drop ]
208 dup create-predicate-word
209 [ 1quotation "predicate" set-word-prop ]
210 [ swap "predicating" set-word-prop ]
213 [ 2drop t "class" set-word-prop ]
214 [ 2drop update-map+ ]
215 [ nip ?metaclass-changed ]
218 GENERIC: update-class ( class -- )
220 M: class update-class drop ;
222 GENERIC: update-methods ( class seq -- )
224 : update-classes ( class -- )
226 [ nip [ update-class ] each ] [ update-methods ] 2bi ;
228 : check-inheritance ( subclass superclass -- )
229 2dup superclass-of? [ bad-inheritance ] [ 2drop ] if ;
231 : define-class ( word superclass members participants metaclass -- )
232 [ 2dup check-inheritance ] 3dip
233 make-class-props [ (define-class) ] [ drop changed-definition ] 2bi ;
235 : forget-predicate ( class -- )
239 [ nip ] [ "predicating" word-prop = ] 2bi
240 [ forget ] [ drop ] if
243 GENERIC: forget-methods ( class -- )
247 : forget-class ( class -- )
248 dup f check-metaclass {
249 [ drop forget-predicate ]
250 [ drop forget-methods ]
251 [ drop implementors-map- ]
254 [ 2drop reset-caches ]
255 [ ?metaclass-changed ]
258 M: class metaclass-changed
259 swap class? [ drop ] [ forget-class ] if ;
261 M: class forget* ( class -- )
262 [ call-next-method ] [ forget-class ] bi ;