1 ! Copyright (C) 2004, 2010 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
7 FROM: namespaces => set ;
10 ERROR: bad-inheritance class superclass ;
12 PREDICATE: class < word "class" word-prop ;
17 SYMBOL: class-not-cache
18 SYMBOL: classes-intersect-cache
19 SYMBOL: class-and-cache
20 SYMBOL: class-or-cache
21 SYMBOL: next-method-quot-cache
24 H{ } clone class<=-cache set
25 H{ } clone class-not-cache set
26 H{ } clone classes-intersect-cache set
27 H{ } clone class-and-cache set
28 H{ } clone class-or-cache set
29 H{ } clone next-method-quot-cache set ;
32 class<=-cache get clear-assoc
33 class-not-cache get clear-assoc
34 classes-intersect-cache get clear-assoc
35 class-and-cache get clear-assoc
36 class-or-cache get clear-assoc
37 next-method-quot-cache get clear-assoc ;
41 SYMBOL: implementors-map
43 GENERIC: rank-class ( class -- n )
45 GENERIC: reset-class ( class -- )
57 M: word reset-class drop ;
61 : classes ( -- seq ) implementors-map get keys ;
63 PREDICATE: predicate < word "predicating" word-prop >boolean ;
65 : create-predicate-word ( word -- predicate )
66 [ name>> "?" append ] [ vocabulary>> ] bi create
67 dup predicate? [ dup reset-generic ] unless ;
69 : predicate-word ( word -- predicate )
70 "predicate" word-prop first ;
72 M: predicate flushable? drop t ;
75 [ call-next-method ] [ f "predicating" set-word-prop ] bi ;
77 M: predicate reset-word
78 [ call-next-method ] [ f "predicating" set-word-prop ] bi ;
80 : define-predicate ( class quot -- )
81 [ predicate-word ] dip (( object -- ? )) define-declared ;
83 : superclass ( class -- super )
84 #! Output f for non-classes to work with algebra code
85 dup class? [ "superclass" word-prop ] [ drop f ] if ;
87 : superclasses ( class -- supers )
88 [ superclass ] follow reverse ;
90 : superclass-of? ( class superclass -- ? )
91 superclasses member-eq? ;
93 : subclass-of? ( class superclass -- ? )
96 : members ( class -- seq )
97 #! Output f for non-classes to work with algebra code
98 dup class? [ "members" word-prop ] [ drop f ] if ;
100 : participants ( class -- seq )
101 #! Output f for non-classes to work with algebra code
102 dup class? [ "participants" word-prop ] [ drop f ] if ;
104 GENERIC: implementors ( class/classes -- seq )
107 : class-uses ( class -- seq )
111 [ superclass [ , ] when* ]
115 : class-usage ( class -- seq ) update-map get at ;
117 : class-usages ( class -- seq ) [ class-usage ] closure keys ;
119 M: class implementors implementors-map get at keys ;
121 M: sequence implementors [ implementors ] gather ;
125 : update-map+ ( class -- )
126 dup class-uses update-map get add-vertex ;
128 : update-map- ( class -- )
129 dup class-uses update-map get remove-vertex ;
131 : implementors-map+ ( class -- )
132 [ H{ } clone ] dip implementors-map get set-at ;
134 : implementors-map- ( class -- )
135 implementors-map get delete-at ;
137 : make-class-props ( superclass members participants metaclass -- assoc )
140 [ dup [ bootstrap-word ] when "superclass" set ]
141 [ [ bootstrap-word ] map "members" set ]
142 [ [ bootstrap-word ] map "participants" set ]
147 GENERIC: metaclass-changed ( use class -- )
149 : ?metaclass-changed ( class usages/f -- )
150 dup [ [ metaclass-changed ] with each ] [ 2drop ] if ;
152 : check-metaclass ( class metaclass -- usages/f )
154 over "metaclass" word-prop eq?
155 [ drop f ] [ class-usage keys ] if
158 : ?define-symbol ( word -- )
159 dup deferred? [ define-symbol ] [ drop ] if ;
161 : (define-class) ( word props -- )
163 2dup "metaclass" swap at check-metaclass
165 [ 2drop update-map- ]
166 [ 2drop dup class? [ reset-class ] [ implementors-map+ ] if ]
167 [ 2drop ?define-symbol ]
168 [ drop [ assoc-union ] curry change-props drop ]
171 dup create-predicate-word
172 [ 1quotation "predicate" set-word-prop ]
173 [ swap "predicating" set-word-prop ]
176 [ 2drop t "class" set-word-prop ]
177 [ 2drop update-map+ ]
178 [ nip ?metaclass-changed ]
181 GENERIC: update-class ( class -- )
183 M: class update-class drop ;
185 GENERIC: update-methods ( class seq -- )
187 : update-classes ( class -- )
189 [ nip [ update-class ] each ] [ update-methods ] 2bi ;
191 : check-inheritance ( subclass superclass -- )
192 2dup superclass-of? [ bad-inheritance ] [ 2drop ] if ;
194 : define-class ( word superclass members participants metaclass -- )
195 [ 2dup check-inheritance ] 3dip
196 make-class-props [ (define-class) ] [ drop changed-definition ] 2bi ;
198 : forget-predicate ( class -- )
199 dup "predicate" word-prop
202 [ nip ] [ "predicating" word-prop = ] 2bi
203 [ forget ] [ drop ] if
206 GENERIC: forget-methods ( class -- )
210 : forget-class ( class -- )
211 dup f check-metaclass {
212 [ drop forget-predicate ]
213 [ drop forget-methods ]
214 [ drop implementors-map- ]
217 [ 2drop reset-caches ]
218 [ ?metaclass-changed ]
221 M: class metaclass-changed
222 swap class? [ drop ] [ forget-class ] if ;
224 M: class forget* ( class -- )
225 [ call-next-method ] [ forget-class ] bi ;
227 GENERIC: class ( object -- class )
229 GENERIC: instance? ( object class -- ? ) flushable