1 ! Copyright (C) 2005, 2010 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.algebra.private classes.builtin
7 classes.private slots.private slots math.private accessors
11 PREDICATE: tuple-class < class
12 "metaclass" word-prop tuple-class eq? ;
14 ERROR: not-a-tuple object ;
16 : all-slots ( class -- slots )
17 superclasses [ "slots" word-prop ] map concat ;
19 PREDICATE: immutable-tuple-class < tuple-class
20 all-slots [ read-only>> ] all? ;
24 : tuple-layout ( class -- layout )
27 : layout-of ( tuple -- layout )
28 1 slot { array } declare ; inline
30 M: tuple class-of layout-of 2 slot { word } declare ; inline
32 : tuple-size ( tuple -- size )
33 layout-of 3 slot { fixnum } declare ; inline
35 : layout-up-to-date? ( object -- ? )
37 [ [ layout-of ] [ class-of tuple-layout ] bi eq? ] [ drop t ] if ;
39 : check-tuple ( object -- tuple )
40 dup tuple? [ not-a-tuple ] unless ; inline
42 : prepare-tuple>array ( tuple -- n tuple layout )
43 check-tuple [ tuple-size iota ] [ ] [ layout-of ] tri ;
45 : copy-tuple-slots ( n tuple -- array )
46 [ array-nth ] curry map ;
48 : check-slots ( seq class -- seq class )
51 class>> 2dup instance?
52 [ 2drop ] [ bad-slot-value ] if
54 ] if-bootstrapping ; inline
56 : initial-values ( class -- slots )
57 all-slots [ initial>> ] map ;
59 : pad-slots ( slots class -- slots' class )
60 [ initial-values over length tail append ] keep ; inline
64 : tuple>array ( tuple -- array )
66 [ copy-tuple-slots ] dip
69 : tuple-slots ( tuple -- seq )
70 prepare-tuple>array drop copy-tuple-slots ;
72 GENERIC: slots>tuple ( seq class -- tuple )
74 M: tuple-class slots>tuple ( seq class -- tuple )
76 tuple-layout <tuple> [
78 [ [ set-array-nth ] curry ]
82 : >tuple ( seq -- tuple )
85 ERROR: bad-superclass class ;
87 : tuple= ( tuple1 tuple2 -- ? )
88 2dup [ tuple? ] both? [
89 2dup [ layout-of ] bi@ eq? [
91 [ [ [ drop array-nth ] [ nip array-nth ] 3bi = ] 2curry ]
94 ] [ 2drop f ] if ; inline
96 GENERIC: final-class? ( object -- ? )
98 M: tuple-class final-class? "final" word-prop ;
100 M: builtin-class final-class? tuple eq? not ;
102 M: class final-class? drop t ;
104 M: object final-class? drop f ;
108 : tuple-predicate-quot/1 ( class -- quot )
109 #! Fast path for tuples with no superclass
110 [ ] curry [ layout-of 7 slot ] [ eq? ] surround 1quotation
111 [ dup tuple? ] [ [ drop f ] if ] surround ;
113 : tuple-instance? ( object class offset -- ? )
117 [ swap slot eq? ] [ 3drop f ] if
118 ] [ 3drop f ] if ; inline
120 : layout-class-offset ( echelon -- n )
123 : tuple-predicate-quot ( class echelon -- quot )
124 layout-class-offset [ tuple-instance? ] 2curry ;
126 : echelon-of ( class -- n )
129 : define-tuple-predicate ( class -- )
131 { 1 [ tuple-predicate-quot/1 ] }
132 [ tuple-predicate-quot ]
133 } case define-predicate ;
135 : class-size ( class -- n )
136 superclasses [ "slots" word-prop length ] map-sum ;
138 : boa-check-quot ( class -- quot )
139 all-slots [ class>> instance-check-quot ] map shallow-spread>quot
142 : define-boa-check ( class -- )
143 dup boa-check-quot "boa-check" set-word-prop ;
145 : tuple-prototype ( class -- prototype )
146 [ initial-values ] keep over [ ] any?
147 [ slots>tuple ] [ 2drop f ] if ;
149 : define-tuple-prototype ( class -- )
150 dup tuple-prototype "prototype" set-word-prop ;
152 : prepare-slots ( slots superclass -- slots' )
153 [ make-slots ] [ class-size 2 + ] bi* finalize-slots ;
155 : define-tuple-slots ( class -- )
156 dup "slots" word-prop over superclass prepare-slots
159 : make-tuple-layout ( class -- layout )
163 [ [ superclass class-size ] [ "slots" word-prop length ] bi + , ]
164 [ superclasses length 1 - , ]
165 [ superclasses [ [ , ] [ hashcode , ] bi ] each ]
169 : define-tuple-layout ( class -- )
170 dup make-tuple-layout "layout" set-word-prop ;
172 : compute-slot-permutation ( new-slots old-slots -- triples )
173 [ [ [ name>> ] map ] bi@ [ index ] curry map ]
174 [ drop [ class>> ] map ]
175 [ drop [ initial>> ] map ]
178 : update-slot ( old-values n class initial -- value )
180 [ [ swap nth dup ] dip instance? ] dip swap
182 ] [ [ 3drop ] dip ] if ;
184 : apply-slot-permutation ( old-values triples -- new-values )
185 [ first3 update-slot ] with map ;
187 SYMBOL: outdated-tuples
189 : permute-slots ( old-values layout -- new-values )
190 [ first all-slots ] [ outdated-tuples get at ] bi
191 compute-slot-permutation
192 apply-slot-permutation ;
194 : update-tuple ( tuple -- newtuple )
195 [ tuple-slots ] [ layout-of ] bi
196 [ permute-slots ] [ first ] bi
199 : outdated-tuple? ( tuple assoc -- ? )
200 [ [ layout-of ] dip key? ]
201 [ drop class-of "forgotten" word-prop not ]
204 : update-tuples ( -- )
206 dup assoc-empty? [ drop ] [
207 [ [ tuple? ] instances ] dip [ outdated-tuple? ] curry filter
208 dup [ update-tuple ] map become
211 : update-tuples-after ( class -- )
212 [ all-slots ] [ tuple-layout ] bi outdated-tuples get set-at ;
214 M: tuple-class update-class
217 [ define-tuple-layout ]
218 [ define-tuple-slots ]
219 [ define-tuple-predicate ]
220 [ define-tuple-prototype ]
223 : define-new-tuple-class ( class superclass slots -- )
224 [ drop f f tuple-class define-class ]
225 [ nip "slots" set-word-prop ]
226 [ 2drop update-classes ]
229 : subclasses ( class -- classes )
230 class-usages [ tuple-class? ] filter ;
232 : each-subclass ( class quot -- )
233 [ subclasses ] dip each ; inline
235 : redefine-tuple-class ( class superclass slots -- )
239 [ update-tuples-after ]
240 [ changed-conditionally ]
244 [ define-new-tuple-class ] 3bi ;
246 : tuple-class-unchanged? ( class superclass slots -- ? )
247 [ [ superclass ] [ bootstrap-word ] bi* = ]
248 [ [ "slots" word-prop ] dip = ]
251 : check-superclass ( superclass -- )
252 dup final-class? [ bad-superclass ] when
253 dup class? [ bad-superclass ] unless drop ;
255 GENERIC# (define-tuple-class) 2 ( class superclass slots -- )
257 : thrower-effect ( slots -- effect )
258 [ name>> ] map { "*" } <effect> ;
260 : error-slots ( slots -- slots' )
262 dup string? [ 1array ] when
263 read-only swap remove
267 : reset-final ( class -- )
269 [ f "final" set-word-prop ]
270 [ changed-conditionally ]
276 : define-tuple-class ( class superclass slots -- )
277 over check-superclass
279 (define-tuple-class) ;
281 GENERIC: make-final ( class -- )
283 M: tuple-class make-final
284 [ dup class-usage keys ?metaclass-changed ]
285 [ t "final" set-word-prop ]
288 M: word (define-tuple-class)
289 define-new-tuple-class ;
291 M: tuple-class (define-tuple-class)
293 3dup tuple-class-unchanged?
294 [ 2drop ?define-symbol ] [ redefine-tuple-class ] if ;
296 PREDICATE: error-class < tuple-class
297 "error-class" word-prop ;
299 M: error-class reset-class
300 [ call-next-method ] [ "error-class" remove-word-prop ] bi ;
302 : define-error-class ( class superclass slots -- )
304 [ define-tuple-class ]
305 [ 2drop reset-generic ]
306 [ 2drop t "error-class" set-word-prop ]
309 [ dup [ boa throw ] curry ]
310 [ all-slots thrower-effect ]
315 : boa-effect ( class -- effect )
316 [ all-slots [ name>> ] map ] [ name>> 1array ] bi <effect> ;
318 : define-boa-word ( word class -- )
319 [ [ boa ] curry ] [ boa-effect ] bi define-inline ;
321 : forget-slot-accessors ( class slots -- )
324 [ reader-word ?lookup-method forget ]
325 [ writer-word ?lookup-method forget ] 2bi
328 M: tuple-class reset-class
330 dup "slots" word-prop forget-slot-accessors
333 [ { "layout" "slots" "boa-check" "prototype" "final" } reset-props ]
337 M: tuple-class metaclass-changed
338 ! Our superclass is no longer a tuple class, redefine with
340 nip tuple over "slots" word-prop define-tuple-class ;
342 M: tuple-class rank-class drop 1 ;
344 M: tuple-class instance?
345 dup echelon-of layout-class-offset tuple-instance? ;
347 M: tuple-class (flatten-class) dup set ;
349 M: tuple-class (classes-intersect?)
351 { [ over builtin-class? ] [ drop tuple eq? ] }
352 { [ over tuple-class? ] [ [ class<= ] [ swap class<= ] 2bi or ] }
355 M: tuple clone (clone) ; inline
357 M: tuple equal? over tuple? [ tuple= ] [ 2drop f ] if ;
359 : tuple-hashcode ( depth obj -- hash )
362 [ class-of hashcode ] [ tuple-size ] bi
363 [ dup fixnum+fast 82520 fixnum+fast ] [ iota ] bi
365 swapd array-nth hashcode* >fixnum rot fixnum-bitxor
366 pick fixnum*fast [ [ fixnum+fast ] keep ] dip swap
367 ] 2curry each drop nip 97531 fixnum+fast ; inline
369 M: tuple hashcode* [ tuple-hashcode ] recursive-hashcode ;
372 dup "prototype" word-prop [ (clone) ] [ tuple-layout <tuple> ] ?if ;
375 [ "boa-check" word-prop [ call ] when* ]
379 M: tuple-class initial-value* new t ;