Commit | Line | Data |
---|---|---|
14f1d9fe MD |
1 | ;;; installed-scm-file |
2 | ||
cc6c7fee | 3 | ;;;; Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation, Inc. |
14f1d9fe MD |
4 | ;;;; |
5 | ;;;; This program is free software; you can redistribute it and/or modify | |
6 | ;;;; it under the terms of the GNU General Public License as published by | |
7 | ;;;; the Free Software Foundation; either version 2, or (at your option) | |
8 | ;;;; any later version. | |
9 | ;;;; | |
10 | ;;;; This program is distributed in the hope that it will be useful, | |
11 | ;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | ;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | ;;;; GNU General Public License for more details. | |
14 | ;;;; | |
15 | ;;;; You should have received a copy of the GNU General Public License | |
16 | ;;;; along with this software; see the file COPYING. If not, write to | |
17 | ;;;; the Free Software Foundation, Inc., 59 Temple Place, Suite 330, | |
18 | ;;;; Boston, MA 02111-1307 USA | |
19 | ;;;; | |
20 | \f | |
21 | ||
22 | ;;;; This software is a derivative work of other copyrighted softwares; the | |
23 | ;;;; copyright notices of these softwares are placed in the file COPYRIGHTS | |
24 | ;;;; | |
25 | ;;;; This file is based upon stklos.stk from the STk distribution by | |
26 | ;;;; Erick Gallesio <eg@unice.fr>. | |
27 | ;;;; | |
28 | ||
29 | (define-module (oop goops) | |
30 | :use-module (oop goops goopscore) | |
31 | :use-module (oop goops util) | |
32 | :use-module (oop goops dispatch) | |
33 | :use-module (oop goops compile) | |
34 | :no-backtrace | |
35 | ) | |
36 | ||
37 | (export ; Define the exported symbols of this file | |
38 | goops-version is-a? | |
39 | ensure-metaclass ensure-metaclass-with-supers | |
40 | define-class class make-class | |
41 | define-generic make-generic ensure-generic | |
42 | define-accessor make-accessor ensure-accessor | |
43 | define-method make-method method add-method! | |
44 | object-eqv? object-equal? | |
45 | class-slot-ref class-slot-set! slot-unbound slot-missing | |
46 | slot-definition-name slot-definition-options slot-definition-allocation | |
47 | slot-definition-getter slot-definition-setter slot-definition-accessor | |
48 | slot-definition-init-value slot-definition-init-form | |
49 | slot-definition-init-thunk slot-definition-init-keyword | |
50 | slot-init-function class-slot-definition | |
51 | method-source | |
52 | compute-cpl compute-std-cpl compute-get-n-set compute-slots | |
53 | compute-getter-method compute-setter-method | |
54 | allocate-instance initialize make-instance make | |
55 | no-next-method no-applicable-method no-method | |
56 | change-class update-instance-for-different-class | |
57 | shallow-clone deep-clone | |
58 | class-redefinition | |
59 | apply-generic apply-method apply-methods | |
60 | compute-applicable-methods %compute-applicable-methods | |
61 | method-more-specific? sort-applicable-methods | |
62 | class-subclasses class-methods | |
63 | goops-error | |
64 | min-fixnum max-fixnum | |
65 | ) | |
66 | ||
67 | ;;; *fixme* Should go into goops.c | |
68 | ||
69 | (export | |
70 | instance? slot-ref-using-class | |
71 | slot-set-using-class! slot-bound-using-class? | |
72 | slot-exists-using-class? slot-ref slot-set! slot-bound? class-of | |
73 | class-name class-direct-supers class-direct-subclasses | |
74 | class-direct-methods class-direct-slots class-precedence-list | |
75 | class-slots class-environment | |
76 | generic-function-name | |
77 | generic-function-methods method-generic-function method-specializers | |
78 | primitive-generic-generic enable-primitive-generic! | |
79 | method-procedure accessor-method-slot-definition | |
ca83b028 | 80 | slot-exists? make find-method get-keyword) |
14f1d9fe MD |
81 | |
82 | \f | |
83 | (define min-fixnum (- (expt 2 29))) | |
84 | ||
85 | (define max-fixnum (- (expt 2 29) 1)) | |
86 | ||
87 | ;; | |
88 | ;; goops-error | |
89 | ;; | |
90 | (define (goops-error format-string . args) | |
91 | (save-stack) | |
92 | (scm-error 'goops-error #f format-string args '())) | |
93 | ||
94 | ;; | |
95 | ;; is-a? | |
96 | ;; | |
97 | (define (is-a? obj class) | |
98 | (and (memq class (class-precedence-list (class-of obj))) #t)) | |
99 | ||
100 | ||
101 | ;;; | |
102 | ;;; {Meta classes} | |
103 | ;;; | |
104 | ||
105 | (define ensure-metaclass-with-supers | |
106 | (let ((table-of-metas '())) | |
107 | (lambda (meta-supers) | |
108 | (let ((entry (assoc meta-supers table-of-metas))) | |
109 | (if entry | |
110 | ;; Found a previously created metaclass | |
111 | (cdr entry) | |
112 | ;; Create a new meta-class which inherit from "meta-supers" | |
113 | (let ((new (make <class> #:dsupers meta-supers | |
114 | #:slots '() | |
115 | #:name (gensym "metaclass")))) | |
116 | (set! table-of-metas (cons (cons meta-supers new) table-of-metas)) | |
117 | new)))))) | |
118 | ||
119 | (define (ensure-metaclass supers env) | |
120 | (if (null? supers) | |
121 | <class> | |
122 | (let* ((all-metas (map (lambda (x) (class-of x)) supers)) | |
123 | (all-cpls (apply append | |
124 | (map (lambda (m) | |
125 | (cdr (class-precedence-list m))) | |
126 | all-metas))) | |
127 | (needed-metas '())) | |
128 | ;; Find the most specific metaclasses. The new metaclass will be | |
129 | ;; a subclass of these. | |
130 | (for-each | |
131 | (lambda (meta) | |
132 | (if (and (not (member meta all-cpls)) | |
133 | (not (member meta needed-metas))) | |
134 | (set! needed-metas (append needed-metas (list meta))))) | |
135 | all-metas) | |
136 | ;; Now return a subclass of the metaclasses we found. | |
137 | (if (null? (cdr needed-metas)) | |
138 | (car needed-metas) ; If there's only one, just use it. | |
139 | (ensure-metaclass-with-supers needed-metas))))) | |
140 | ||
141 | ;;; | |
142 | ;;; {Classes} | |
143 | ;;; | |
144 | ||
145 | ;;; (define-class NAME (SUPER ...) SLOT-DEFINITION ... OPTION ...) | |
146 | ;;; | |
147 | ;;; SLOT-DEFINITION ::= SLOT-NAME | (SLOT-NAME OPTION ...) | |
148 | ;;; OPTION ::= KEYWORD VALUE | |
149 | ;;; | |
150 | (define (define-class-pre-definition keyword exp env) | |
151 | (case keyword | |
152 | ((#:getter #:setter) | |
153 | (if (defined? exp env) | |
154 | `(define ,exp (ensure-generic ,exp ',exp)) | |
155 | `(define ,exp (make-generic ',exp)))) | |
156 | ((#:accessor) | |
157 | (if (defined? exp env) | |
158 | `(define ,exp (ensure-accessor ,exp ',exp)) | |
159 | `(define ,exp (make-accessor ',exp)))) | |
160 | (else #f))) | |
161 | ||
162 | ;;; This code should be implemented in C. | |
163 | ;;; | |
164 | (define define-class | |
165 | (letrec (;; Some slot options require extra definitions to be made. | |
166 | ;; In particular, we want to make sure that the generic | |
167 | ;; function objects which represent accessors exist | |
168 | ;; before `make-class' tries to add methods to them. | |
169 | ;; | |
170 | ;; Postpone error handling to class macro. | |
171 | ;; | |
172 | (pre-definitions | |
173 | (lambda (slots env) | |
174 | (do ((slots slots (cdr slots)) | |
175 | (definitions '() | |
176 | (if (pair? (car slots)) | |
177 | (do ((options (cdar slots) (cddr options)) | |
178 | (definitions definitions | |
179 | (cond ((not (symbol? (cadr options))) | |
180 | definitions) | |
181 | ((define-class-pre-definition | |
182 | (car options) | |
183 | (cadr options) | |
184 | env) | |
185 | => (lambda (definition) | |
186 | (cons definition definitions))) | |
187 | (else definitions)))) | |
188 | ((not (and (pair? options) | |
189 | (pair? (cdr options)))) | |
190 | definitions)) | |
191 | definitions))) | |
192 | ((or (not (pair? slots)) | |
193 | (keyword? (car slots))) | |
194 | (reverse definitions))))) | |
195 | ||
196 | ;; Syntax | |
197 | (name cadr) | |
198 | (slots cdddr)) | |
199 | ||
200 | (procedure->macro | |
201 | (lambda (exp env) | |
202 | (cond ((not (top-level-env? env)) | |
203 | (goops-error "define-class: Only allowed at top level")) | |
204 | ((not (and (list? exp) (>= (length exp) 3))) | |
205 | (goops-error "missing or extra expression")) | |
206 | (else | |
207 | (let ((name (name exp))) | |
208 | `(begin | |
209 | ;; define accessors | |
210 | ,@(pre-definitions (slots exp) env) | |
211 | ||
212 | ,(if (defined? name env) | |
213 | ||
214 | ;; redefine an old class | |
215 | `(define ,name | |
216 | (let ((old ,name) | |
217 | (new (class ,@(cddr exp) #:name ',name))) | |
218 | (if (and (is-a? old <class>) | |
219 | ;; Prevent redefinition of non-objects | |
220 | (memq <object> | |
221 | (class-precedence-list old))) | |
222 | (class-redefinition old new) | |
223 | new))) | |
224 | ||
225 | ;; define a new class | |
226 | `(define ,name | |
227 | (class ,@(cddr exp) #:name ',name))))))))))) | |
228 | ||
229 | (define standard-define-class define-class) | |
230 | ||
231 | ;;; (class (SUPER ...) SLOT-DEFINITION ... OPTION ...) | |
232 | ;;; | |
233 | ;;; SLOT-DEFINITION ::= SLOT-NAME | (SLOT-NAME OPTION ...) | |
234 | ;;; OPTION ::= KEYWORD VALUE | |
235 | ;;; | |
236 | (define class | |
237 | (letrec ((slot-option-keyword car) | |
238 | (slot-option-value cadr) | |
239 | (process-slot-options | |
240 | (lambda (options) | |
241 | (let loop ((options options) | |
242 | (res '())) | |
243 | (cond ((null? options) | |
244 | (reverse res)) | |
245 | ((null? (cdr options)) | |
246 | (goops-error "malformed slot option list")) | |
247 | ((not (keyword? (slot-option-keyword options))) | |
248 | (goops-error "malformed slot option list")) | |
249 | (else | |
250 | (case (slot-option-keyword options) | |
251 | ((#:init-form) | |
252 | (loop (cddr options) | |
253 | (append (list `(lambda () | |
254 | ,(slot-option-value options)) | |
255 | #:init-thunk | |
256 | (list 'quote | |
257 | (slot-option-value options)) | |
258 | #:init-form) | |
259 | res))) | |
260 | (else | |
261 | (loop (cddr options) | |
262 | (cons (cadr options) | |
263 | (cons (car options) | |
264 | res))))))))))) | |
265 | ||
266 | (procedure->memoizing-macro | |
267 | (let ((supers cadr) | |
268 | (slots cddr) | |
269 | (options cdddr)) | |
270 | (lambda (exp env) | |
271 | (cond ((not (and (list? exp) (>= (length exp) 2))) | |
272 | (goops-error "missing or extra expression")) | |
273 | ((not (list? (supers exp))) | |
274 | (goops-error "malformed superclass list: ~S" (supers exp))) | |
275 | (else | |
276 | (let ((slot-defs (cons #f '()))) | |
277 | (do ((slots (slots exp) (cdr slots)) | |
278 | (defs slot-defs (cdr defs))) | |
279 | ((or (null? slots) | |
280 | (keyword? (car slots))) | |
281 | `(make-class | |
282 | ;; evaluate super class variables | |
283 | (list ,@(supers exp)) | |
284 | ;; evaluate slot definitions, except the slot name! | |
285 | (list ,@(cdr slot-defs)) | |
286 | ;; evaluate class options | |
287 | ,@slots | |
288 | ;; place option last in case someone wants to | |
289 | ;; pass a different value | |
290 | #:environment ',env)) | |
291 | (set-cdr! | |
292 | defs | |
293 | (list (if (pair? (car slots)) | |
294 | `(list ',(slot-definition-name (car slots)) | |
295 | ,@(process-slot-options | |
296 | (slot-definition-options | |
297 | (car slots)))) | |
298 | `(list ',(car slots)))))))))))))) | |
299 | ||
300 | (define (make-class supers slots . options) | |
301 | (let ((env (or (get-keyword #:environment options #f) | |
302 | (top-level-env)))) | |
303 | (let* ((name (get-keyword #:name options (make-unbound))) | |
304 | (supers (if (not (or-map (lambda (class) | |
305 | (memq <object> | |
306 | (class-precedence-list class))) | |
307 | supers)) | |
308 | (append supers (list <object>)) | |
309 | supers)) | |
310 | (metaclass (or (get-keyword #:metaclass options #f) | |
311 | (ensure-metaclass supers env)))) | |
312 | ||
313 | ;; Verify that all direct slots are different and that we don't inherit | |
314 | ;; several time from the same class | |
315 | (let ((tmp1 (find-duplicate supers)) | |
316 | (tmp2 (find-duplicate (map slot-definition-name slots)))) | |
317 | (if tmp1 | |
318 | (goops-error "make-class: super class ~S is duplicate in class ~S" | |
319 | tmp1 name)) | |
320 | (if tmp2 | |
321 | (goops-error "make-class: slot ~S is duplicate in class ~S" | |
322 | tmp2 name))) | |
323 | ||
324 | ;; Everything seems correct, build the class | |
325 | (apply make metaclass | |
326 | #:dsupers supers | |
327 | #:slots slots | |
328 | #:name name | |
329 | #:environment env | |
330 | options)))) | |
331 | ||
332 | ;;; | |
333 | ;;; {Generic functions and accessors} | |
334 | ;;; | |
335 | ||
336 | (define define-generic | |
337 | (procedure->macro | |
338 | (lambda (exp env) | |
339 | (let ((name (cadr exp))) | |
340 | (cond ((not (symbol? name)) | |
341 | (goops-error "bad generic function name: ~S" name)) | |
342 | ((defined? name env) | |
343 | `(define ,name | |
344 | (if (is-a? ,name <generic>) | |
345 | (make <generic> #:name ',name) | |
346 | (ensure-generic ,name ',name)))) | |
347 | (else | |
348 | `(define ,name (make <generic> #:name ',name)))))))) | |
349 | ||
350 | (define (make-generic . name) | |
351 | (let ((name (and (pair? name) (car name)))) | |
352 | (make <generic> #:name name))) | |
353 | ||
354 | (define (ensure-generic old-definition . name) | |
355 | (let ((name (and (pair? name) (car name)))) | |
356 | (cond ((is-a? old-definition <generic>) old-definition) | |
357 | ((procedure-with-setter? old-definition) | |
358 | (make <generic-with-setter> | |
359 | #:name name | |
360 | #:default (procedure old-definition) | |
361 | #:setter (setter old-definition))) | |
362 | ((procedure? old-definition) | |
363 | (make <generic> #:name name #:default old-definition)) | |
364 | (else (make <generic> #:name name))))) | |
365 | ||
366 | (define define-accessor | |
367 | (procedure->macro | |
368 | (lambda (exp env) | |
369 | (let ((name (cadr exp))) | |
370 | (cond ((not (symbol? name)) | |
371 | (goops-error "bad accessor name: ~S" name)) | |
372 | ((defined? name env) | |
373 | `(define ,name | |
374 | (if (and (is-a? ,name <generic-with-setter>) | |
375 | (is-a? (setter ,name) <generic>)) | |
376 | (make-accessor ',name) | |
377 | (ensure-accessor ,name ',name)))) | |
378 | (else | |
379 | `(define ,name (make-accessor ',name)))))))) | |
380 | ||
381 | (define (make-setter-name name) | |
382 | (string->symbol (string-append "setter:" (symbol->string name)))) | |
383 | ||
384 | (define (make-accessor . name) | |
385 | (let ((name (and (pair? name) (car name)))) | |
386 | (make <generic-with-setter> | |
387 | #:name name | |
388 | #:setter (make <generic> | |
389 | #:name (and name (make-setter-name name)))))) | |
390 | ||
391 | (define (ensure-accessor proc . name) | |
392 | (let ((name (and (pair? name) (car name)))) | |
393 | (cond ((is-a? proc <generic-with-setter>) | |
394 | (if (is-a? (setter proc) <generic>) | |
395 | proc | |
396 | (upgrade-generic-with-setter proc (setter proc)))) | |
397 | ((is-a? proc <generic>) | |
398 | (upgrade-generic-with-setter proc (make-generic name))) | |
399 | ((procedure-with-setter? proc) | |
400 | (make <generic-with-setter> | |
401 | #:name name | |
402 | #:default (procedure proc) | |
403 | #:setter (ensure-generic (setter proc) name))) | |
404 | ((procedure? proc) | |
405 | (ensure-accessor (ensure-generic proc name) name)) | |
406 | (else | |
407 | (make-accessor name))))) | |
408 | ||
409 | (define (upgrade-generic-with-setter generic setter) | |
410 | (let ((methods (generic-function-methods generic)) | |
411 | (gws (make <generic-with-setter> | |
412 | #:name (generic-function-name generic) | |
413 | #:setter setter))) | |
414 | ;; Steal old methods | |
415 | (for-each (lambda (method) | |
416 | (slot-set! method 'generic-function gws)) | |
417 | methods) | |
418 | (slot-set! gws 'methods methods) | |
419 | gws)) | |
420 | ||
421 | ;;; | |
422 | ;;; {Methods} | |
423 | ;;; | |
424 | ||
425 | (define define-method | |
426 | (procedure->memoizing-macro | |
427 | (lambda (exp env) | |
428 | (let ((name (cadr exp))) | |
429 | (if (and (pair? name) | |
430 | (eq? (car name) 'setter) | |
431 | (pair? (cdr name)) | |
432 | (symbol? (cadr name)) | |
433 | (null? (cddr name))) | |
434 | (let ((name (cadr name))) | |
435 | (cond ((not (symbol? name)) | |
436 | (goops-error "bad method name: ~S" name)) | |
437 | ((defined? name env) | |
438 | `(begin | |
439 | ;; *fixme* Temporary hack for the current module system | |
440 | (if (not ,name) | |
441 | (define-generic ,name)) | |
442 | (add-method! (setter ,name) (method ,@(cddr exp))))) | |
443 | (else | |
444 | `(begin | |
445 | (define-accessor ,name) | |
446 | (add-method! (setter ,name) (method ,@(cddr exp))))))) | |
447 | (cond ((pair? name) | |
448 | ;; Convert new syntax to old | |
449 | `(define-method ,(car name) ,(cdr name) ,@(cddr exp))) | |
450 | ((not (symbol? name)) | |
451 | (goops-error "bad method name: ~S" name)) | |
452 | ((defined? name env) | |
453 | `(begin | |
454 | ;; *fixme* Temporary hack for the current module system | |
455 | (if (not ,name) | |
456 | (define-generic ,name)) | |
457 | (add-method! ,name (method ,@(cddr exp))))) | |
458 | (else | |
459 | `(begin | |
460 | (define-generic ,name) | |
461 | (add-method! ,name (method ,@(cddr exp))))))))))) | |
462 | ||
463 | (define (make-method specializers procedure) | |
464 | (make <method> | |
465 | #:specializers specializers | |
466 | #:procedure procedure)) | |
467 | ||
468 | (define method | |
469 | (letrec ((specializers | |
470 | (lambda (ls) | |
cc6c7fee | 471 | (cond ((null? ls) '('())) |
14f1d9fe MD |
472 | ((pair? ls) (cons (if (pair? (car ls)) |
473 | (cadar ls) | |
474 | '<top>) | |
475 | (specializers (cdr ls)))) | |
476 | (else '(<top>))))) | |
477 | (formals | |
478 | (lambda (ls) | |
479 | (if (pair? ls) | |
480 | (cons (if (pair? (car ls)) (caar ls) (car ls)) | |
481 | (formals (cdr ls))) | |
482 | ls)))) | |
483 | (procedure->memoizing-macro | |
484 | (lambda (exp env) | |
485 | (let ((args (cadr exp)) | |
486 | (body (cddr exp))) | |
487 | `(make <method> | |
488 | #:specializers (list* ,@(specializers args)) | |
489 | #:procedure (lambda ,(formals args) | |
cc6c7fee MD |
490 | ,@(if (null? body) |
491 | (list *unspecified*) | |
492 | body)))))))) | |
14f1d9fe MD |
493 | |
494 | ;;; | |
495 | ;;; {add-method!} | |
496 | ;;; | |
497 | ||
498 | (define (add-method-in-classes! m) | |
499 | ;; Add method in all the classes which appears in its specializers list | |
500 | (for-each* (lambda (x) | |
501 | (let ((dm (class-direct-methods x))) | |
502 | (if (not (memv m dm)) | |
503 | (slot-set! x 'direct-methods (cons m dm))))) | |
504 | (method-specializers m))) | |
505 | ||
506 | (define (remove-method-in-classes! m) | |
507 | ;; Remove method in all the classes which appears in its specializers list | |
508 | (for-each* (lambda (x) | |
509 | (slot-set! x | |
510 | 'direct-methods | |
511 | (delv! m (class-direct-methods x)))) | |
512 | (method-specializers m))) | |
513 | ||
514 | (define (compute-new-list-of-methods gf new) | |
515 | (let ((new-spec (method-specializers new)) | |
516 | (methods (generic-function-methods gf))) | |
517 | (let loop ((l methods)) | |
518 | (if (null? l) | |
519 | (cons new methods) | |
520 | (if (equal? (method-specializers (car l)) new-spec) | |
521 | (begin | |
522 | ;; This spec. list already exists. Remove old method from dependents | |
523 | (remove-method-in-classes! (car l)) | |
524 | (set-car! l new) | |
525 | methods) | |
526 | (loop (cdr l))))))) | |
527 | ||
528 | (define (internal-add-method! gf m) | |
529 | (slot-set! m 'generic-function gf) | |
530 | (slot-set! gf 'methods (compute-new-list-of-methods gf m)) | |
531 | (let ((specializers (slot-ref m 'specializers))) | |
532 | (slot-set! gf 'n-specialized | |
81211c73 MD |
533 | (max (length* specializers) |
534 | (slot-ref gf 'n-specialized)))) | |
14f1d9fe MD |
535 | (%invalidate-method-cache! gf) |
536 | (add-method-in-classes! m) | |
537 | *unspecified*) | |
538 | ||
539 | (define-generic add-method!) | |
540 | ||
541 | (internal-add-method! add-method! | |
542 | (make <method> | |
543 | #:specializers (list <generic> <method>) | |
544 | #:procedure internal-add-method!)) | |
545 | ||
546 | (define-method add-method! ((proc <procedure>) (m <method>)) | |
547 | (if (generic-capability? proc) | |
548 | (begin | |
549 | (enable-primitive-generic! proc) | |
550 | (add-method! proc m)) | |
551 | (next-method))) | |
552 | ||
553 | (define-method add-method! ((pg <primitive-generic>) (m <method>)) | |
554 | (add-method! (primitive-generic-generic pg) m)) | |
555 | ||
556 | (define-method add-method! (obj (m <method>)) | |
557 | (goops-error "~S is not a valid generic function" obj)) | |
558 | ||
559 | ;;; | |
560 | ;;; {Access to meta objects} | |
561 | ;;; | |
562 | ||
563 | ;;; | |
564 | ;;; Methods | |
565 | ;;; | |
566 | (define-method method-source ((m <method>)) | |
567 | (let* ((spec (map* class-name (slot-ref m 'specializers))) | |
568 | (proc (procedure-source (slot-ref m 'procedure))) | |
569 | (args (cadr proc)) | |
570 | (body (cddr proc))) | |
571 | (cons 'method | |
572 | (cons (map* list args spec) | |
573 | body)))) | |
574 | ||
575 | ;;; | |
576 | ;;; Slots | |
577 | ;;; | |
578 | (define slot-definition-name car) | |
579 | ||
580 | (define slot-definition-options cdr) | |
581 | ||
582 | (define (slot-definition-allocation s) | |
583 | (get-keyword #:allocation (cdr s) #:instance)) | |
584 | ||
585 | (define (slot-definition-getter s) | |
586 | (get-keyword #:getter (cdr s) #f)) | |
587 | ||
588 | (define (slot-definition-setter s) | |
589 | (get-keyword #:setter (cdr s) #f)) | |
590 | ||
591 | (define (slot-definition-accessor s) | |
592 | (get-keyword #:accessor (cdr s) #f)) | |
593 | ||
594 | (define (slot-definition-init-value s) | |
595 | ;; can be #f, so we can't use #f as non-value | |
596 | (get-keyword #:init-value (cdr s) (make-unbound))) | |
597 | ||
598 | (define (slot-definition-init-form s) | |
599 | (get-keyword #:init-form (cdr s) (make-unbound))) | |
600 | ||
601 | (define (slot-definition-init-thunk s) | |
602 | (get-keyword #:init-thunk (cdr s) #f)) | |
603 | ||
604 | (define (slot-definition-init-keyword s) | |
605 | (get-keyword #:init-keyword (cdr s) #f)) | |
606 | ||
607 | (define (class-slot-definition class slot-name) | |
608 | (assq slot-name (class-slots class))) | |
609 | ||
610 | (define (slot-init-function class slot-name) | |
611 | (cadr (assq slot-name (slot-ref class 'getters-n-setters)))) | |
612 | ||
613 | ||
614 | ;;; | |
615 | ;;; {Standard methods used by the C runtime} | |
616 | ;;; | |
617 | ||
618 | ;;; Methods to compare objects | |
619 | ;;; | |
620 | ||
621 | (define-method object-eqv? (x y) #f) | |
622 | (define-method object-equal? (x y) (eqv? x y)) | |
623 | ||
624 | ;;; | |
625 | ;;; methods to display/write an object | |
626 | ;;; | |
627 | ||
628 | ; Code for writing objects must test that the slots they use are | |
629 | ; bound. Otherwise a slot-unbound method will be called and will | |
630 | ; conduct to an infinite loop. | |
631 | ||
632 | ;; Write | |
633 | (define (display-address o file) | |
634 | (display (number->string (object-address o) 16) file)) | |
635 | ||
636 | (define-method write (o file) | |
637 | (display "#<instance " file) | |
638 | (display-address o file) | |
639 | (display #\> file)) | |
640 | ||
641 | (define write-object (primitive-generic-generic write)) | |
642 | ||
643 | (define-method write ((o <object>) file) | |
644 | (let ((class (class-of o))) | |
645 | (if (slot-bound? class 'name) | |
646 | (begin | |
647 | (display "#<" file) | |
648 | (display (class-name class) file) | |
649 | (display #\space file) | |
650 | (display-address o file) | |
651 | (display #\> file)) | |
652 | (next-method)))) | |
653 | ||
654 | (define-method write ((o <foreign-object>) file) | |
655 | (let ((class (class-of o))) | |
656 | (if (slot-bound? class 'name) | |
657 | (begin | |
658 | (display "#<foreign-object " file) | |
659 | (display (class-name class) file) | |
660 | (display #\space file) | |
661 | (display-address o file) | |
662 | (display #\> file)) | |
663 | (next-method)))) | |
664 | ||
665 | (define-method write ((class <class>) file) | |
666 | (let ((meta (class-of class))) | |
667 | (if (and (slot-bound? class 'name) | |
668 | (slot-bound? meta 'name)) | |
669 | (begin | |
670 | (display "#<" file) | |
671 | (display (class-name meta) file) | |
672 | (display #\space file) | |
673 | (display (class-name class) file) | |
674 | (display #\space file) | |
675 | (display-address class file) | |
676 | (display #\> file)) | |
677 | (next-method)))) | |
678 | ||
679 | (define-method write ((gf <generic>) file) | |
680 | (let ((meta (class-of gf))) | |
681 | (if (and (slot-bound? meta 'name) | |
682 | (slot-bound? gf 'methods)) | |
683 | (begin | |
684 | (display "#<" file) | |
685 | (display (class-name meta) file) | |
686 | (let ((name (generic-function-name gf))) | |
687 | (if name | |
688 | (begin | |
689 | (display #\space file) | |
690 | (display name file)))) | |
691 | (display " (" file) | |
692 | (display (length (generic-function-methods gf)) file) | |
693 | (display ")>" file)) | |
694 | (next-method)))) | |
695 | ||
696 | (define-method write ((o <method>) file) | |
697 | (let ((meta (class-of o))) | |
698 | (if (and (slot-bound? meta 'name) | |
699 | (slot-bound? o 'specializers)) | |
700 | (begin | |
701 | (display "#<" file) | |
702 | (display (class-name meta) file) | |
703 | (display #\space file) | |
704 | (display (map* (lambda (spec) | |
705 | (if (slot-bound? spec 'name) | |
706 | (slot-ref spec 'name) | |
707 | spec)) | |
708 | (method-specializers o)) | |
709 | file) | |
710 | (display #\space file) | |
711 | (display-address o file) | |
712 | (display #\> file)) | |
713 | (next-method)))) | |
714 | ||
715 | ;; Display (do the same thing as write by default) | |
716 | (define-method display (o file) | |
717 | (write-object o file)) | |
718 | ||
719 | ;;; | |
720 | ;;; slot access | |
721 | ;;; | |
722 | ||
723 | (define (class-slot-g-n-s class slot-name) | |
724 | (let* ((this-slot (assq slot-name (slot-ref class 'slots))) | |
725 | (g-n-s (cddr (or (assq slot-name (slot-ref class 'getters-n-setters)) | |
726 | (slot-missing class slot-name))))) | |
727 | (if (not (memq (slot-definition-allocation this-slot) | |
728 | '(#:class #:each-subclass))) | |
729 | (slot-missing class slot-name)) | |
730 | g-n-s)) | |
731 | ||
732 | (define (class-slot-ref class slot) | |
733 | (let ((x ((car (class-slot-g-n-s class slot)) #f))) | |
734 | (if (unbound? x) | |
735 | (slot-unbound class slot) | |
736 | x))) | |
737 | ||
738 | (define (class-slot-set! class slot value) | |
739 | ((cadr (class-slot-g-n-s class slot)) #f value)) | |
740 | ||
741 | (define-method slot-unbound ((c <class>) (o <object>) s) | |
742 | (goops-error "Slot `~S' is unbound in object ~S" s o)) | |
743 | ||
744 | (define-method slot-unbound ((c <class>) s) | |
745 | (goops-error "Slot `~S' is unbound in class ~S" s c)) | |
746 | ||
747 | (define-method slot-unbound ((o <object>)) | |
748 | (goops-error "Unbound slot in object ~S" o)) | |
749 | ||
750 | (define-method slot-missing ((c <class>) (o <object>) s) | |
751 | (goops-error "No slot with name `~S' in object ~S" s o)) | |
752 | ||
753 | (define-method slot-missing ((c <class>) s) | |
754 | (goops-error "No class slot with name `~S' in class ~S" s c)) | |
755 | ||
756 | ||
757 | (define-method slot-missing ((c <class>) (o <object>) s value) | |
758 | (slot-missing c o s)) | |
759 | ||
760 | ;;; Methods for the possible error we can encounter when calling a gf | |
761 | ||
762 | (define-method no-next-method ((gf <generic>) args) | |
763 | (goops-error "No next method when calling ~S\nwith arguments ~S" gf args)) | |
764 | ||
765 | (define-method no-applicable-method ((gf <generic>) args) | |
766 | (goops-error "No applicable method for ~S in call ~S" | |
767 | gf (cons (generic-function-name gf) args))) | |
768 | ||
769 | (define-method no-method ((gf <generic>) args) | |
770 | (goops-error "No method defined for ~S" gf)) | |
771 | ||
772 | ;;; | |
773 | ;;; {Cloning functions (from rdeline@CS.CMU.EDU)} | |
774 | ;;; | |
775 | ||
776 | (define-method shallow-clone ((self <object>)) | |
777 | (let ((clone (%allocate-instance (class-of self) '())) | |
778 | (slots (map slot-definition-name | |
779 | (class-slots (class-of self))))) | |
780 | (for-each (lambda (slot) | |
781 | (if (slot-bound? self slot) | |
782 | (slot-set! clone slot (slot-ref self slot)))) | |
783 | slots) | |
784 | clone)) | |
785 | ||
786 | (define-method deep-clone ((self <object>)) | |
787 | (let ((clone (%allocate-instance (class-of self) '())) | |
788 | (slots (map slot-definition-name | |
789 | (class-slots (class-of self))))) | |
790 | (for-each (lambda (slot) | |
791 | (if (slot-bound? self slot) | |
792 | (slot-set! clone slot | |
793 | (let ((value (slot-ref self slot))) | |
794 | (if (instance? value) | |
795 | (deep-clone value) | |
796 | value))))) | |
797 | slots) | |
798 | clone)) | |
799 | ||
800 | ;;; | |
801 | ;;; {Class redefinition utilities} | |
802 | ;;; | |
803 | ||
804 | ;;; (class-redefinition OLD NEW) | |
805 | ;;; | |
806 | ||
807 | ;;; Has correct the following conditions: | |
808 | ||
809 | ;;; Methods | |
810 | ;;; | |
811 | ;;; 1. New accessor specializers refer to new header | |
812 | ;;; | |
813 | ;;; Classes | |
814 | ;;; | |
815 | ;;; 1. New class cpl refers to the new class header | |
816 | ;;; 2. Old class header exists on old super classes direct-subclass lists | |
817 | ;;; 3. New class header exists on new super classes direct-subclass lists | |
818 | ||
819 | (define-method class-redefinition ((old <class>) (new <class>)) | |
820 | ;; Work on direct methods: | |
821 | ;; 1. Remove accessor methods from the old class | |
822 | ;; 2. Patch the occurences of new in the specializers by old | |
823 | ;; 3. Displace the methods from old to new | |
824 | (remove-class-accessors! old) ;; -1- | |
825 | (let ((methods (class-direct-methods new))) | |
826 | (for-each (lambda (m) | |
827 | (update-direct-method! m new old)) ;; -2- | |
828 | methods) | |
829 | (slot-set! new | |
830 | 'direct-methods | |
831 | (append methods (class-direct-methods old)))) | |
832 | ||
833 | ;; Substitute old for new in new cpl | |
834 | (set-car! (slot-ref new 'cpl) old) | |
835 | ||
836 | ;; Remove the old class from the direct-subclasses list of its super classes | |
837 | (for-each (lambda (c) (slot-set! c 'direct-subclasses | |
838 | (delv! old (class-direct-subclasses c)))) | |
839 | (class-direct-supers old)) | |
840 | ||
841 | ;; Replace the new class with the old in the direct-subclasses of the supers | |
842 | (for-each (lambda (c) | |
843 | (slot-set! c 'direct-subclasses | |
844 | (cons old (delv! new (class-direct-subclasses c))))) | |
845 | (class-direct-supers new)) | |
846 | ||
847 | ;; Swap object headers | |
848 | (%modify-class old new) | |
849 | ||
850 | ;; Now old is NEW! | |
851 | ||
852 | ;; Redefine all the subclasses of old to take into account modification | |
853 | (for-each | |
854 | (lambda (c) | |
855 | (update-direct-subclass! c new old)) | |
856 | (class-direct-subclasses new)) | |
857 | ||
858 | ;; Invalidate class so that subsequent instances slot accesses invoke | |
859 | ;; change-object-class | |
860 | (slot-set! new 'redefined old) | |
861 | (%invalidate-class new) ;must come after slot-set! | |
862 | ||
863 | old) | |
864 | ||
865 | ;;; | |
866 | ;;; remove-class-accessors! | |
867 | ;;; | |
868 | ||
869 | (define-method remove-class-accessors! ((c <class>)) | |
870 | (for-each (lambda (m) | |
871 | (if (is-a? m <accessor-method>) | |
872 | (remove-method-in-classes! m))) | |
873 | (class-direct-methods c))) | |
874 | ||
875 | ;;; | |
876 | ;;; update-direct-method! | |
877 | ;;; | |
878 | ||
879 | (define-method update-direct-method! ((m <method>) | |
880 | (old <class>) | |
881 | (new <class>)) | |
882 | (let loop ((l (method-specializers m))) | |
883 | ;; Note: the <top> in dotted list is never used. | |
884 | ;; So we can work as if we had only proper lists. | |
885 | (if (pair? l) | |
886 | (begin | |
887 | (if (eqv? (car l) old) | |
888 | (set-car! l new)) | |
889 | (loop (cdr l)))))) | |
890 | ||
891 | ;;; | |
892 | ;;; update-direct-subclass! | |
893 | ;;; | |
894 | ||
895 | (define-method update-direct-subclass! ((c <class>) | |
896 | (old <class>) | |
897 | (new <class>)) | |
898 | (class-redefinition c | |
899 | (make-class (class-direct-supers c) | |
900 | (class-direct-slots c) | |
901 | #:name (class-name c) | |
902 | #:environment (slot-ref c 'environment) | |
903 | #:metaclass (class-of c)))) | |
904 | ||
905 | ;;; | |
906 | ;;; {Utilities for INITIALIZE methods} | |
907 | ;;; | |
908 | ||
909 | ;;; compute-slot-accessors | |
910 | ;;; | |
911 | (define (compute-slot-accessors class slots env) | |
912 | (for-each | |
913 | (lambda (s g-n-s) | |
914 | (let ((name (slot-definition-name s)) | |
915 | (getter-function (slot-definition-getter s)) | |
916 | (setter-function (slot-definition-setter s)) | |
917 | (accessor (slot-definition-accessor s))) | |
918 | (if getter-function | |
919 | (add-method! getter-function | |
920 | (compute-getter-method class g-n-s))) | |
921 | (if setter-function | |
922 | (add-method! setter-function | |
923 | (compute-setter-method class g-n-s))) | |
924 | (if accessor | |
925 | (begin | |
926 | (add-method! accessor | |
927 | (compute-getter-method class g-n-s)) | |
928 | (add-method! (setter accessor) | |
929 | (compute-setter-method class g-n-s)))))) | |
930 | slots (slot-ref class 'getters-n-setters))) | |
931 | ||
932 | (define-method compute-getter-method ((class <class>) slotdef) | |
933 | (let ((init-thunk (cadr slotdef)) | |
934 | (g-n-s (cddr slotdef))) | |
935 | (make <accessor-method> | |
936 | #:specializers (list class) | |
937 | #:procedure (cond ((pair? g-n-s) | |
938 | (if init-thunk | |
939 | (car g-n-s) | |
940 | (make-generic-bound-check-getter (car g-n-s)) | |
941 | )) | |
942 | (init-thunk | |
943 | (standard-get g-n-s)) | |
944 | (else | |
945 | (bound-check-get g-n-s))) | |
946 | #:slot-definition slotdef))) | |
947 | ||
948 | (define-method compute-setter-method ((class <class>) slotdef) | |
949 | (let ((g-n-s (cddr slotdef))) | |
950 | (make <accessor-method> | |
951 | #:specializers (list class <top>) | |
952 | #:procedure (if (pair? g-n-s) | |
953 | (cadr g-n-s) | |
954 | (standard-set g-n-s)) | |
955 | #:slot-definition slotdef))) | |
956 | ||
957 | (define (make-generic-bound-check-getter proc) | |
958 | (let ((source (and (closure? proc) (procedure-source proc)))) | |
959 | (if (and source (null? (cdddr source))) | |
960 | (let ((obj (caadr source))) | |
961 | ;; smart closure compilation | |
962 | (local-eval | |
963 | `(lambda (,obj) (,assert-bound ,(caddr source) ,obj)) | |
964 | (procedure-environment proc))) | |
965 | (lambda (o) (assert-bound (proc o) o))))) | |
966 | ||
967 | (define n-standard-accessor-methods 10) | |
968 | ||
969 | (define bound-check-get-methods (make-vector n-standard-accessor-methods #f)) | |
970 | (define standard-get-methods (make-vector n-standard-accessor-methods #f)) | |
971 | (define standard-set-methods (make-vector n-standard-accessor-methods #f)) | |
972 | ||
973 | (define (standard-accessor-method make methods) | |
974 | (lambda (index) | |
975 | (cond ((>= index n-standard-accessor-methods) (make index)) | |
976 | ((vector-ref methods index)) | |
977 | (else (let ((m (make index))) | |
978 | (vector-set! methods index m) | |
979 | m))))) | |
980 | ||
981 | (define (make-bound-check-get index) | |
982 | (local-eval `(lambda (o) (@assert-bound-ref o ,index)) (the-environment))) | |
983 | ||
984 | (define (make-get index) | |
985 | (local-eval `(lambda (o) (@slot-ref o ,index)) (the-environment))) | |
986 | ||
987 | (define (make-set index) | |
988 | (local-eval `(lambda (o v) (@slot-set! o ,index v)) (the-environment))) | |
989 | ||
990 | (define bound-check-get | |
991 | (standard-accessor-method make-bound-check-get bound-check-get-methods)) | |
992 | (define standard-get (standard-accessor-method make-get standard-get-methods)) | |
993 | (define standard-set (standard-accessor-method make-set standard-set-methods)) | |
994 | ||
995 | ;;; compute-getters-n-setters | |
996 | ;;; | |
997 | (define (compute-getters-n-setters class slots env) | |
998 | ||
999 | (define (compute-slot-init-function s) | |
1000 | (or (slot-definition-init-thunk s) | |
1001 | (let ((init (slot-definition-init-value s))) | |
1002 | (and (not (unbound? init)) | |
1003 | (lambda () init))))) | |
1004 | ||
1005 | (define (verify-accessors slot l) | |
1006 | (if (pair? l) | |
1007 | (let ((get (car l)) | |
1008 | (set (cadr l))) | |
1009 | (if (not (and (closure? get) | |
1010 | (= (car (procedure-property get 'arity)) 1))) | |
1011 | (goops-error "Bad getter closure for slot `~S' in ~S: ~S" | |
1012 | slot class get)) | |
1013 | (if (not (and (closure? set) | |
1014 | (= (car (procedure-property set 'arity)) 2))) | |
1015 | (goops-error "Bad setter closure for slot `~S' in ~S: ~S" | |
1016 | slot class set))))) | |
1017 | ||
1018 | (map (lambda (s) | |
1019 | (let* ((g-n-s (compute-get-n-set class s)) | |
1020 | (name (slot-definition-name s))) | |
1021 | ; For each slot we have '(name init-function getter setter) | |
1022 | ; If slot, we have the simplest form '(name init-function . index) | |
1023 | (verify-accessors name g-n-s) | |
1024 | (cons name | |
1025 | (cons (compute-slot-init-function s) | |
1026 | g-n-s)))) | |
1027 | slots)) | |
1028 | ||
1029 | ;;; compute-cpl | |
1030 | ;;; | |
1031 | ;;; Correct behaviour: | |
1032 | ;;; | |
1033 | ;;; (define-class food ()) | |
1034 | ;;; (define-class fruit (food)) | |
1035 | ;;; (define-class spice (food)) | |
1036 | ;;; (define-class apple (fruit)) | |
1037 | ;;; (define-class cinnamon (spice)) | |
1038 | ;;; (define-class pie (apple cinnamon)) | |
1039 | ;;; => cpl (pie) = pie apple fruit cinnamon spice food object top | |
1040 | ;;; | |
1041 | ;;; (define-class d ()) | |
1042 | ;;; (define-class e ()) | |
1043 | ;;; (define-class f ()) | |
1044 | ;;; (define-class b (d e)) | |
1045 | ;;; (define-class c (e f)) | |
1046 | ;;; (define-class a (b c)) | |
1047 | ;;; => cpl (a) = a b d c e f object top | |
1048 | ;;; | |
1049 | ||
1050 | (define-method compute-cpl ((class <class>)) | |
1051 | (compute-std-cpl class class-direct-supers)) | |
1052 | ||
1053 | ;; Support | |
1054 | ||
1055 | (define (only-non-null lst) | |
1056 | (filter (lambda (l) (not (null? l))) lst)) | |
1057 | ||
1058 | (define (compute-std-cpl c get-direct-supers) | |
1059 | (let ((c-direct-supers (get-direct-supers c))) | |
1060 | (merge-lists (list c) | |
1061 | (only-non-null (append (map class-precedence-list | |
1062 | c-direct-supers) | |
1063 | (list c-direct-supers)))))) | |
1064 | ||
1065 | (define (merge-lists reversed-partial-result inputs) | |
1066 | (cond | |
1067 | ((every null? inputs) | |
1068 | (reverse! reversed-partial-result)) | |
1069 | (else | |
1070 | (let* ((candidate (lambda (c) | |
1071 | (and (not (any (lambda (l) | |
1072 | (memq c (cdr l))) | |
1073 | inputs)) | |
1074 | c))) | |
1075 | (candidate-car (lambda (l) | |
1076 | (and (not (null? l)) | |
1077 | (candidate (car l))))) | |
1078 | (next (any candidate-car inputs))) | |
1079 | (if (not next) | |
1080 | (goops-error "merge-lists: Inconsistent precedence graph")) | |
1081 | (let ((remove-next (lambda (l) | |
1082 | (if (eq? (car l) next) | |
1083 | (cdr l) | |
1084 | l)))) | |
1085 | (merge-lists (cons next reversed-partial-result) | |
1086 | (only-non-null (map remove-next inputs)))))))) | |
1087 | ||
1088 | ;; Modified from TinyClos: | |
1089 | ;; | |
1090 | ;; A simple topological sort. | |
1091 | ;; | |
1092 | ;; It's in this file so that both TinyClos and Objects can use it. | |
1093 | ;; | |
1094 | ;; This is a fairly modified version of code I originally got from Anurag | |
1095 | ;; Mendhekar <anurag@moose.cs.indiana.edu>. | |
1096 | ;; | |
1097 | ||
1098 | (define (compute-clos-cpl c get-direct-supers) | |
1099 | (top-sort ((build-transitive-closure get-direct-supers) c) | |
1100 | ((build-constraints get-direct-supers) c) | |
1101 | (std-tie-breaker get-direct-supers))) | |
1102 | ||
1103 | ||
1104 | (define (top-sort elements constraints tie-breaker) | |
1105 | (let loop ((elements elements) | |
1106 | (constraints constraints) | |
1107 | (result '())) | |
1108 | (if (null? elements) | |
1109 | result | |
1110 | (let ((can-go-in-now | |
1111 | (filter | |
1112 | (lambda (x) | |
1113 | (every (lambda (constraint) | |
1114 | (or (not (eq? (cadr constraint) x)) | |
1115 | (memq (car constraint) result))) | |
1116 | constraints)) | |
1117 | elements))) | |
1118 | (if (null? can-go-in-now) | |
1119 | (goops-error "top-sort: Invalid constraints") | |
1120 | (let ((choice (if (null? (cdr can-go-in-now)) | |
1121 | (car can-go-in-now) | |
1122 | (tie-breaker result | |
1123 | can-go-in-now)))) | |
1124 | (loop | |
1125 | (filter (lambda (x) (not (eq? x choice))) | |
1126 | elements) | |
1127 | constraints | |
1128 | (append result (list choice))))))))) | |
1129 | ||
1130 | (define (std-tie-breaker get-supers) | |
1131 | (lambda (partial-cpl min-elts) | |
1132 | (let loop ((pcpl (reverse partial-cpl))) | |
1133 | (let ((current-elt (car pcpl))) | |
1134 | (let ((ds-of-ce (get-supers current-elt))) | |
1135 | (let ((common (filter (lambda (x) | |
1136 | (memq x ds-of-ce)) | |
1137 | min-elts))) | |
1138 | (if (null? common) | |
1139 | (if (null? (cdr pcpl)) | |
1140 | (goops-error "std-tie-breaker: Nothing valid") | |
1141 | (loop (cdr pcpl))) | |
1142 | (car common)))))))) | |
1143 | ||
1144 | ||
1145 | (define (build-transitive-closure get-follow-ons) | |
1146 | (lambda (x) | |
1147 | (let track ((result '()) | |
1148 | (pending (list x))) | |
1149 | (if (null? pending) | |
1150 | result | |
1151 | (let ((next (car pending))) | |
1152 | (if (memq next result) | |
1153 | (track result (cdr pending)) | |
1154 | (track (cons next result) | |
1155 | (append (get-follow-ons next) | |
1156 | (cdr pending))))))))) | |
1157 | ||
1158 | (define (build-constraints get-follow-ons) | |
1159 | (lambda (x) | |
1160 | (let loop ((elements ((build-transitive-closure get-follow-ons) x)) | |
1161 | (this-one '()) | |
1162 | (result '())) | |
1163 | (if (or (null? this-one) (null? (cdr this-one))) | |
1164 | (if (null? elements) | |
1165 | result | |
1166 | (loop (cdr elements) | |
1167 | (cons (car elements) | |
1168 | (get-follow-ons (car elements))) | |
1169 | result)) | |
1170 | (loop elements | |
1171 | (cdr this-one) | |
1172 | (cons (list (car this-one) (cadr this-one)) | |
1173 | result)))))) | |
1174 | ||
1175 | ;;; compute-get-n-set | |
1176 | ;;; | |
1177 | (define-method compute-get-n-set ((class <class>) s) | |
1178 | (case (slot-definition-allocation s) | |
1179 | ((#:instance) ;; Instance slot | |
1180 | ;; get-n-set is just its offset | |
1181 | (let ((already-allocated (slot-ref class 'nfields))) | |
1182 | (slot-set! class 'nfields (+ already-allocated 1)) | |
1183 | already-allocated)) | |
1184 | ||
1185 | ((#:class) ;; Class slot | |
1186 | ;; Class-slots accessors are implemented as 2 closures around | |
1187 | ;; a Scheme variable. As instance slots, class slots must be | |
1188 | ;; unbound at init time. | |
1189 | (let ((name (slot-definition-name s))) | |
1190 | (if (memq name (map slot-definition-name (class-direct-slots class))) | |
1191 | ;; This slot is direct; create a new shared variable | |
1192 | (make-closure-variable class) | |
1193 | ;; Slot is inherited. Find its definition in superclass | |
1194 | (let loop ((l (cdr (class-precedence-list class)))) | |
1195 | (let ((r (assoc name (slot-ref (car l) 'getters-n-setters)))) | |
1196 | (if r | |
1197 | (cddr r) | |
1198 | (loop (cdr l)))))))) | |
1199 | ||
1200 | ((#:each-subclass) ;; slot shared by instances of direct subclass. | |
1201 | ;; (Thomas Buerger, April 1998) | |
1202 | (make-closure-variable class)) | |
1203 | ||
1204 | ((#:virtual) ;; No allocation | |
1205 | ;; slot-ref and slot-set! function must be given by the user | |
1206 | (let ((get (get-keyword #:slot-ref (slot-definition-options s) #f)) | |
1207 | (set (get-keyword #:slot-set! (slot-definition-options s) #f)) | |
1208 | (env (class-environment class))) | |
1209 | (if (not (and get set)) | |
1210 | (goops-error "You must supply a :slot-ref and a :slot-set! in ~S" | |
1211 | s)) | |
1212 | (list get set))) | |
1213 | (else (next-method)))) | |
1214 | ||
1215 | (define (make-closure-variable class) | |
1216 | (let ((shared-variable (make-unbound))) | |
1217 | (list (lambda (o) shared-variable) | |
1218 | (lambda (o v) (set! shared-variable v))))) | |
1219 | ||
1220 | (define-method compute-get-n-set ((o <object>) s) | |
1221 | (goops-error "Allocation \"~S\" is unknown" (slot-definition-allocation s))) | |
1222 | ||
1223 | (define-method compute-slots ((class <class>)) | |
1224 | (%compute-slots class)) | |
1225 | ||
1226 | ;;; | |
1227 | ;;; {Initialize} | |
1228 | ;;; | |
1229 | ||
1230 | (define-method initialize ((object <object>) initargs) | |
1231 | (%initialize-object object initargs)) | |
1232 | ||
1233 | (define-method initialize ((class <class>) initargs) | |
1234 | (next-method) | |
1235 | (let ((dslots (get-keyword #:slots initargs '())) | |
1236 | (supers (get-keyword #:dsupers initargs '())) | |
1237 | (env (get-keyword #:environment initargs (top-level-env)))) | |
1238 | ||
1239 | (slot-set! class 'name (get-keyword #:name initargs '???)) | |
1240 | (slot-set! class 'direct-supers supers) | |
1241 | (slot-set! class 'direct-slots dslots) | |
1242 | (slot-set! class 'direct-subclasses '()) | |
1243 | (slot-set! class 'direct-methods '()) | |
1244 | (slot-set! class 'cpl (compute-cpl class)) | |
1245 | (slot-set! class 'redefined #f) | |
1246 | (slot-set! class 'environment env) | |
1247 | (let ((slots (compute-slots class))) | |
1248 | (slot-set! class 'slots slots) | |
1249 | (slot-set! class 'nfields 0) | |
1250 | (slot-set! class 'getters-n-setters (compute-getters-n-setters class | |
1251 | slots | |
1252 | env)) | |
1253 | ;; Build getters - setters - accessors | |
1254 | (compute-slot-accessors class slots env)) | |
1255 | ||
1256 | ;; Update the "direct-subclasses" of each inherited classes | |
1257 | (for-each (lambda (x) | |
1258 | (slot-set! x | |
1259 | 'direct-subclasses | |
1260 | (cons class (slot-ref x 'direct-subclasses)))) | |
1261 | supers) | |
1262 | ||
1263 | ;; Support for the underlying structs: | |
1264 | ||
1265 | ;; Inherit class flags (invisible on scheme level) from supers | |
1266 | (%inherit-magic! class supers) | |
1267 | ||
1268 | ;; Set the layout slot | |
1269 | (%prep-layout! class))) | |
1270 | ||
1271 | (define object-procedure-tags | |
1272 | '(utag_closure utag_subr_1 utag_subr_2 utag_subr3 utag_lsubr_2)) | |
1273 | ||
1274 | (define (initialize-object-procedure object initargs) | |
1275 | (let ((proc (get-keyword #:procedure initargs #f))) | |
1276 | (cond ((not proc)) | |
1277 | ((pair? proc) | |
1278 | (apply set-object-procedure! object proc)) | |
1279 | ((memq (tag proc) object-procedure-tags) | |
1280 | (set-object-procedure! object proc)) | |
1281 | (else | |
1282 | (set-object-procedure! object | |
1283 | (lambda args (apply proc args))))))) | |
1284 | ||
1285 | (define-method initialize ((class <operator-class>) initargs) | |
1286 | (next-method) | |
1287 | (initialize-object-procedure class initargs)) | |
1288 | ||
1289 | (define-method initialize ((owsc <operator-with-setter-class>) initargs) | |
1290 | (next-method) | |
1291 | (%set-object-setter! owsc (get-keyword #:setter initargs #f))) | |
1292 | ||
1293 | (define-method initialize ((entity <entity>) initargs) | |
1294 | (next-method) | |
1295 | (initialize-object-procedure entity initargs)) | |
1296 | ||
1297 | (define-method initialize ((ews <entity-with-setter>) initargs) | |
1298 | (next-method) | |
1299 | (%set-object-setter! ews (get-keyword #:setter initargs #f))) | |
1300 | ||
1301 | (define-method initialize ((generic <generic>) initargs) | |
1302 | (let ((previous-definition (get-keyword #:default initargs #f)) | |
1303 | (name (get-keyword #:name initargs #f))) | |
1304 | (next-method) | |
1305 | (slot-set! generic 'methods (if (is-a? previous-definition <procedure>) | |
1306 | (list (make <method> | |
1307 | #:specializers <top> | |
1308 | #:procedure | |
1309 | (lambda l | |
1310 | (apply previous-definition | |
1311 | l)))) | |
1312 | '())) | |
1313 | (if name | |
1314 | (set-procedure-property! generic 'name name)) | |
1315 | )) | |
1316 | ||
b432fb4b MD |
1317 | (define dummy-procedure (lambda args *unspecified*)) |
1318 | ||
14f1d9fe MD |
1319 | (define-method initialize ((method <method>) initargs) |
1320 | (next-method) | |
1321 | (slot-set! method 'generic-function (get-keyword #:generic-function initargs #f)) | |
1322 | (slot-set! method 'specializers (get-keyword #:specializers initargs '())) | |
b432fb4b MD |
1323 | (slot-set! method 'procedure |
1324 | (get-keyword #:procedure initargs dummy-procedure)) | |
14f1d9fe MD |
1325 | (slot-set! method 'code-table '())) |
1326 | ||
1327 | (define-method initialize ((obj <foreign-object>) initargs)) | |
1328 | ||
1329 | ;;; | |
1330 | ;;; {Change-class} | |
1331 | ;;; | |
1332 | ||
1333 | (define (change-object-class old-instance old-class new-class) | |
cc6c7fee | 1334 | (let ((new-instance (allocate-instance new-class '()))) |
14f1d9fe MD |
1335 | ;; Initalize the slot of the new instance |
1336 | (for-each (lambda (slot) | |
1337 | (if (and (slot-exists-using-class? old-class old-instance slot) | |
1338 | (eq? (slot-definition-allocation | |
1339 | (class-slot-definition old-class slot)) | |
1340 | #:instance) | |
1341 | (slot-bound-using-class? old-class old-instance slot)) | |
1342 | ;; Slot was present and allocated in old instance; copy it | |
1343 | (slot-set-using-class! | |
1344 | new-class | |
1345 | new-instance | |
1346 | slot | |
1347 | (slot-ref-using-class old-class old-instance slot)) | |
1348 | ;; slot was absent; initialize it with its default value | |
1349 | (let ((init (slot-init-function new-class slot))) | |
1350 | (if init | |
1351 | (slot-set-using-class! | |
1352 | new-class | |
1353 | new-instance | |
1354 | slot | |
1355 | (apply init '())))))) | |
1356 | (map slot-definition-name (class-slots new-class))) | |
1357 | ;; Exchange old and new instance in place to keep pointers valid | |
1358 | (%modify-instance old-instance new-instance) | |
1359 | ;; Allow class specific updates of instances (which now are swapped) | |
1360 | (update-instance-for-different-class new-instance old-instance) | |
1361 | old-instance)) | |
1362 | ||
1363 | ||
1364 | (define-method update-instance-for-different-class ((old-instance <object>) | |
1365 | (new-instance | |
1366 | <object>)) | |
1367 | ;;not really important what we do, we just need a default method | |
1368 | new-instance) | |
1369 | ||
1370 | (define-method change-class ((old-instance <object>) (new-class <class>)) | |
1371 | (change-object-class old-instance (class-of old-instance) new-class)) | |
1372 | ||
1373 | ;;; | |
1374 | ;;; {make} | |
1375 | ;;; | |
1376 | ;;; A new definition which overwrites the previous one which was built-in | |
1377 | ;;; | |
1378 | ||
1379 | (define-method allocate-instance ((class <class>) initargs) | |
1380 | (%allocate-instance class initargs)) | |
1381 | ||
1382 | (define-method make-instance ((class <class>) . initargs) | |
1383 | (let ((instance (allocate-instance class initargs))) | |
1384 | (initialize instance initargs) | |
1385 | instance)) | |
1386 | ||
1387 | (define make make-instance) | |
1388 | ||
1389 | ;;; | |
1390 | ;;; {apply-generic} | |
1391 | ;;; | |
1392 | ;;; Protocol for calling standard generic functions. This protocol is | |
1393 | ;;; not used for real <generic> functions (in this case we use a | |
1394 | ;;; completely C hard-coded protocol). Apply-generic is used by | |
1395 | ;;; goops for calls to subclasses of <generic> and <generic-with-setter>. | |
1396 | ;;; The code below is similar to the first MOP described in AMOP. In | |
1397 | ;;; particular, it doesn't used the currified approach to gf | |
1398 | ;;; call. There are 2 reasons for that: | |
1399 | ;;; - the protocol below is exposed to mimic completely the one written in C | |
1400 | ;;; - the currified protocol would be imho inefficient in C. | |
1401 | ;;; | |
1402 | ||
1403 | (define-method apply-generic ((gf <generic>) args) | |
1404 | (if (null? (slot-ref gf 'methods)) | |
1405 | (no-method gf args)) | |
1406 | (let ((methods (compute-applicable-methods gf args))) | |
1407 | (if methods | |
1408 | (apply-methods gf (sort-applicable-methods gf methods args) args) | |
1409 | (no-applicable-method gf args)))) | |
1410 | ||
1411 | ;; compute-applicable-methods is bound to %compute-applicable-methods. | |
1412 | ;; *fixme* use let | |
1413 | (define %%compute-applicable-methods | |
1414 | (make <generic> #:name 'compute-applicable-methods)) | |
1415 | ||
1416 | (define-method %%compute-applicable-methods ((gf <generic>) args) | |
1417 | (%compute-applicable-methods gf args)) | |
1418 | ||
1419 | (set! compute-applicable-methods %%compute-applicable-methods) | |
1420 | ||
1421 | (define-method sort-applicable-methods ((gf <generic>) methods args) | |
1422 | (let ((targs (map class-of args))) | |
1423 | (sort methods (lambda (m1 m2) (method-more-specific? m1 m2 targs))))) | |
1424 | ||
1425 | (define-method method-more-specific? ((m1 <method>) (m2 <method>) targs) | |
1426 | (%method-more-specific? m1 m2 targs)) | |
1427 | ||
1428 | (define-method apply-method ((gf <generic>) methods build-next args) | |
1429 | (apply (method-procedure (car methods)) | |
1430 | (build-next (cdr methods) args) | |
1431 | args)) | |
1432 | ||
1433 | (define-method apply-methods ((gf <generic>) (l <list>) args) | |
1434 | (letrec ((next (lambda (procs args) | |
1435 | (lambda new-args | |
1436 | (let ((a (if (null? new-args) args new-args))) | |
1437 | (if (null? procs) | |
1438 | (no-next-method gf a) | |
1439 | (apply-method gf procs next a))))))) | |
1440 | (apply-method gf l next args))) | |
1441 | ||
1442 | ;; We don't want the following procedure to turn up in backtraces: | |
1443 | (for-each (lambda (proc) | |
1444 | (set-procedure-property! proc 'system-procedure #t)) | |
1445 | (list slot-unbound | |
1446 | slot-missing | |
1447 | no-next-method | |
1448 | no-applicable-method | |
1449 | no-method | |
1450 | )) | |
1451 | ||
1452 | ;;; | |
1453 | ;;; {<composite-metaclass> and <active-metaclass>} | |
1454 | ;;; | |
1455 | ||
1456 | ;(autoload "active-slot" <active-metaclass>) | |
1457 | ;(autoload "composite-slot" <composite-metaclass>) | |
1458 | ;(export <composite-metaclass> <active-metaclass>) | |
1459 | ||
1460 | ;;; | |
1461 | ;;; {Tools} | |
1462 | ;;; | |
1463 | ||
1464 | ;; list2set | |
1465 | ;; | |
1466 | ;; duplicate the standard list->set function but using eq instead of | |
1467 | ;; eqv which really sucks a lot, uselessly here | |
1468 | ;; | |
1469 | (define (list2set l) | |
1470 | (let loop ((l l) | |
1471 | (res '())) | |
1472 | (cond | |
1473 | ((null? l) res) | |
1474 | ((memq (car l) res) (loop (cdr l) res)) | |
1475 | (else (loop (cdr l) (cons (car l) res)))))) | |
1476 | ||
1477 | (define (class-subclasses c) | |
1478 | (letrec ((allsubs (lambda (c) | |
1479 | (cons c (mapappend allsubs | |
1480 | (class-direct-subclasses c)))))) | |
1481 | (list2set (cdr (allsubs c))))) | |
1482 | ||
1483 | (define (class-methods c) | |
1484 | (list2set (mapappend class-direct-methods | |
1485 | (cons c (class-subclasses c))))) | |
1486 | ||
1487 | ;;; | |
1488 | ;;; {Final initialization} | |
1489 | ;;; | |
1490 | ||
1491 | ;; Tell C code that the main bulk of Goops has been loaded | |
1492 | (%goops-loaded) |