1 ! Copyright (C) 2005, 2008 Slava Pestov.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: arrays definitions hashtables kernel kernel.private math
4 namespaces make sequences sequences.private strings vectors
5 words quotations memory combinators generic classes
6 classes.algebra classes.builtin classes.private slots.private
7 slots compiler.units math.private accessors assocs effects ;
10 PREDICATE: tuple-class < class
11 "metaclass" word-prop tuple-class eq? ;
13 M: tuple class 1 slot 2 slot { word } declare ;
15 ERROR: not-a-tuple object ;
17 : check-tuple ( object -- tuple )
18 dup tuple? [ not-a-tuple ] unless ; inline
20 : all-slots ( class -- slots )
21 superclasses [ "slots" word-prop ] map concat ;
23 PREDICATE: immutable-tuple-class < tuple-class ( class -- ? )
24 all-slots [ read-only>> ] all? ;
28 : tuple-layout ( class -- layout )
31 : layout-of ( tuple -- layout )
32 1 slot { tuple-layout } declare ; inline
34 : tuple-size ( tuple -- size )
35 layout-of size>> ; inline
37 : prepare-tuple>array ( tuple -- n tuple layout )
38 check-tuple [ tuple-size ] [ ] [ layout-of ] tri ;
40 : copy-tuple-slots ( n tuple -- array )
41 [ array-nth ] curry map ;
43 : check-slots ( seq class -- seq class )
46 class>> 2dup instance?
47 [ 2drop ] [ bad-slot-value ] if
49 ] if-bootstrapping ; inline
53 : initial-values ( class -- slots )
54 all-slots [ initial>> ] map ;
56 : pad-slots ( slots class -- slots' class )
57 [ initial-values over length tail append ] keep ; inline
59 : tuple>array ( tuple -- array )
61 >r copy-tuple-slots r>
64 : tuple-slots ( tuple -- seq )
65 prepare-tuple>array drop copy-tuple-slots ;
67 GENERIC: slots>tuple ( seq class -- tuple )
69 M: tuple-class slots>tuple
71 tuple-layout <tuple> [
73 [ [ set-array-nth ] curry ]
77 : >tuple ( seq -- tuple )
80 ERROR: bad-superclass class ;
84 : tuple= ( tuple1 tuple2 -- ? )
85 2dup [ layout-of ] bi@ eq? [
87 [ [ [ drop array-nth ] [ nip array-nth ] 3bi = ] 2curry ]
93 : tuple-instance? ( object class echelon -- ? )
94 #! 4 slot == superclasses>>
98 [ array-nth eq? ] [ 3drop f ] if
99 ] [ 3drop f ] if ; inline
101 : define-tuple-predicate ( class -- )
102 dup dup tuple-layout echelon>>
103 [ tuple-instance? ] 2curry define-predicate ;
105 : superclass-size ( class -- n )
106 superclasses but-last [ "slots" word-prop length ] sigma ;
108 : (instance-check-quot) ( class -- quot )
111 [ "predicate" word-prop % ]
112 [ [ bad-slot-value ] curry , ] bi
116 : (fixnum-check-quot) ( class -- quot )
117 (instance-check-quot) fixnum "coercer" word-prop prepend ;
119 : instance-check-quot ( class -- quot )
121 { [ dup object bootstrap-word eq? ] [ drop [ ] ] }
122 { [ dup "coercer" word-prop ] [ "coercer" word-prop ] }
123 { [ dup \ fixnum class<= ] [ (fixnum-check-quot) ] }
124 [ (instance-check-quot) ]
127 : boa-check-quot ( class -- quot )
128 all-slots [ class>> instance-check-quot ] map spread>quot
131 : define-boa-check ( class -- )
132 dup boa-check-quot "boa-check" set-word-prop ;
134 : tuple-prototype ( class -- prototype )
135 [ initial-values ] keep
136 over [ ] contains? [ slots>tuple ] [ 2drop f ] if ;
138 : define-tuple-prototype ( class -- )
139 dup tuple-prototype "prototype" set-word-prop ;
141 : finalize-tuple-slots ( class slots -- slots )
142 swap superclass-size 2 + finalize-slots ;
144 : define-tuple-slots ( class -- )
145 dup dup "slots" word-prop finalize-tuple-slots
148 : make-tuple-layout ( class -- layout )
150 [ [ superclass-size ] [ "slots" word-prop length ] bi + ]
151 [ superclasses dup length 1- ] tri
154 : define-tuple-layout ( class -- )
155 dup make-tuple-layout "layout" set-word-prop ;
157 : compute-slot-permutation ( new-slots old-slots -- triples )
158 [ [ [ name>> ] map ] bi@ [ index ] curry map ]
159 [ drop [ class>> ] map ]
160 [ drop [ initial>> ] map ]
163 : update-slot ( old-values n class initial -- value )
165 >r >r swap nth dup r> instance? r> swap
167 ] [ >r 3drop r> ] if ;
169 : apply-slot-permutation ( old-values triples -- new-values )
170 [ first3 update-slot ] with map ;
172 : permute-slots ( old-values layout -- new-values )
173 [ class>> all-slots ] [ outdated-tuples get at ] bi
174 compute-slot-permutation
175 apply-slot-permutation ;
177 : update-tuple ( tuple -- newtuple )
178 [ tuple-slots ] [ layout-of ] bi
179 [ permute-slots ] [ class>> ] bi
182 : outdated-tuple? ( tuple assoc -- ? )
184 [ [ layout-of ] dip key? ]
185 [ drop class "forgotten" word-prop not ]
189 : update-tuples ( -- )
191 dup assoc-empty? [ drop ] [
192 [ outdated-tuple? ] curry instances
193 dup [ update-tuple ] map become
196 [ update-tuples ] update-tuples-hook set-global
198 : update-tuples-after ( class -- )
199 [ all-slots ] [ tuple-layout ] bi outdated-tuples get set-at ;
201 M: tuple-class update-class
204 [ define-tuple-layout ]
205 [ define-tuple-slots ]
206 [ define-tuple-predicate ]
207 [ define-tuple-prototype ]
210 : define-new-tuple-class ( class superclass slots -- )
212 [ drop f f tuple-class define-class ]
213 [ nip "slots" set-word-prop ]
214 [ 2drop update-classes ]
217 : subclasses ( class -- classes )
218 class-usages [ tuple-class? ] filter ;
220 : each-subclass ( class quot -- )
221 >r subclasses r> each ; inline
223 : redefine-tuple-class ( class superclass slots -- )
227 [ update-tuples-after ]
232 [ define-new-tuple-class ]
235 : tuple-class-unchanged? ( class superclass slots -- ? )
236 rot tuck [ superclass = ] [ "slots" word-prop = ] 2bi* and ;
238 : valid-superclass? ( class -- ? )
239 [ tuple-class? ] [ tuple eq? ] bi or ;
241 : check-superclass ( superclass -- )
242 dup valid-superclass? [ bad-superclass ] unless drop ;
246 GENERIC# define-tuple-class 2 ( class superclass slots -- )
248 M: word define-tuple-class
249 over check-superclass
250 define-new-tuple-class ;
252 M: tuple-class define-tuple-class
253 over check-superclass
254 3dup tuple-class-unchanged?
255 [ 3drop ] [ redefine-tuple-class ] if ;
257 : thrower-effect ( slots -- effect )
258 [ dup array? [ first ] when ] map f <effect> t >>terminated? ;
260 : define-error-class ( class superclass slots -- )
261 [ define-tuple-class ]
262 [ 2drop reset-generic ]
264 [ dup [ boa throw ] curry ]
270 M: tuple-class reset-class
272 dup "slots" word-prop [
274 [ reader-word method forget ]
275 [ writer-word method forget ] 2bi
279 [ { "layout" "slots" "boa-check" "prototype" } reset-props ]
283 M: tuple-class rank-class drop 0 ;
285 M: tuple-class instance?
286 dup tuple-layout echelon>> tuple-instance? ;
288 M: tuple-class (flatten-class) dup set ;
290 M: tuple-class (classes-intersect?)
292 { [ over tuple eq? ] [ 2drop t ] }
293 { [ over builtin-class? ] [ 2drop f ] }
294 { [ over tuple-class? ] [ [ class<= ] [ swap class<= ] 2bi or ] }
295 [ swap classes-intersect? ]
298 M: tuple clone (clone) ;
300 M: tuple equal? over tuple? [ tuple= ] [ 2drop f ] if ;
304 [ class hashcode ] [ tuple-size ] [ ] tri
306 swapd array-nth hashcode* sequence-hashcode-step
308 ] recursive-hashcode ;
311 dup "prototype" word-prop
312 [ (clone) ] [ tuple-layout <tuple> ] ?if ;
315 [ "boa-check" word-prop [ call ] when* ]
319 M: tuple-class initial-value* new ;