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14f1d9fe MD |
1 | ;;; installed-scm-file |
2 | ||
5b763233 | 3 | ;;;; Copyright (C) 1998,1999,2000,2001,2002, 2003, 2006, 2009, 2010, 2011, 2014, 2015 Free Software Foundation, Inc. |
4ff2133a LC |
4 | ;;;; Copyright (C) 1993-1998 Erick Gallesio - I3S-CNRS/ESSI <eg@unice.fr> |
5 | ;;;; | |
73be1d9e MV |
6 | ;;;; This library is free software; you can redistribute it and/or |
7 | ;;;; modify it under the terms of the GNU Lesser General Public | |
8 | ;;;; License as published by the Free Software Foundation; either | |
53befeb7 | 9 | ;;;; version 3 of the License, or (at your option) any later version. |
4ff2133a | 10 | ;;;; |
73be1d9e | 11 | ;;;; This library is distributed in the hope that it will be useful, |
14f1d9fe | 12 | ;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of |
73be1d9e MV |
13 | ;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
14 | ;;;; Lesser General Public License for more details. | |
4ff2133a | 15 | ;;;; |
73be1d9e MV |
16 | ;;;; You should have received a copy of the GNU Lesser General Public |
17 | ;;;; License along with this library; if not, write to the Free Software | |
92205699 | 18 | ;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
4ff2133a | 19 | ;;;; |
14f1d9fe MD |
20 | \f |
21 | ||
14f1d9fe | 22 | ;;;; |
4ff2133a LC |
23 | ;;;; This file was based upon stklos.stk from the STk distribution |
24 | ;;;; version 4.0.1 by Erick Gallesio <eg@unice.fr>. | |
14f1d9fe MD |
25 | ;;;; |
26 | ||
27 | (define-module (oop goops) | |
583a23bf AW |
28 | #:use-module (srfi srfi-1) |
29 | #:use-module (ice-9 match) | |
30 | #:use-module (oop goops util) | |
31 | #:export-syntax (define-class class standard-define-class | |
32 | define-generic define-accessor define-method | |
33 | define-extended-generic define-extended-generics | |
34 | method) | |
35 | #:export (is-a? class-of | |
1a179b03 MD |
36 | ensure-metaclass ensure-metaclass-with-supers |
37 | make-class | |
38 | make-generic ensure-generic | |
bbf8d523 | 39 | make-extended-generic |
1a179b03 | 40 | make-accessor ensure-accessor |
e177058b | 41 | add-method! |
1a179b03 MD |
42 | class-slot-ref class-slot-set! slot-unbound slot-missing |
43 | slot-definition-name slot-definition-options | |
44 | slot-definition-allocation | |
45 | slot-definition-getter slot-definition-setter | |
46 | slot-definition-accessor | |
47 | slot-definition-init-value slot-definition-init-form | |
48 | slot-definition-init-thunk slot-definition-init-keyword | |
49 | slot-init-function class-slot-definition | |
50 | method-source | |
51 | compute-cpl compute-std-cpl compute-get-n-set compute-slots | |
52 | compute-getter-method compute-setter-method | |
53 | allocate-instance initialize make-instance make | |
54 | no-next-method no-applicable-method no-method | |
55 | change-class update-instance-for-different-class | |
56 | shallow-clone deep-clone | |
57 | class-redefinition | |
58 | apply-generic apply-method apply-methods | |
59 | compute-applicable-methods %compute-applicable-methods | |
60 | method-more-specific? sort-applicable-methods | |
61 | class-subclasses class-methods | |
62 | goops-error | |
63 | min-fixnum max-fixnum | |
64 | ;;; *fixme* Should go into goops.c | |
65 | instance? slot-ref-using-class | |
66 | slot-set-using-class! slot-bound-using-class? | |
67 | slot-exists-using-class? slot-ref slot-set! slot-bound? | |
68 | class-name class-direct-supers class-direct-subclasses | |
69 | class-direct-methods class-direct-slots class-precedence-list | |
9d019f9b | 70 | class-slots |
1a179b03 | 71 | generic-function-name |
4e2f1e9e AW |
72 | generic-function-methods method-generic-function |
73 | method-specializers method-formals | |
1a179b03 MD |
74 | primitive-generic-generic enable-primitive-generic! |
75 | method-procedure accessor-method-slot-definition | |
583a23bf | 76 | slot-exists? make find-method get-keyword)) |
78ec533c | 77 | |
ac0e91c4 AW |
78 | (define *goops-module* (current-module)) |
79 | ||
78ec533c | 80 | ;; First initialize the builtin part of GOOPS |
f6ddf827 | 81 | (eval-when (expand load eval) |
b15dea68 | 82 | (%init-goops-builtins)) |
78ec533c | 83 | |
f6ddf827 | 84 | (eval-when (expand load eval) |
aec4a84a | 85 | (use-modules ((language tree-il primitives) :select (add-interesting-primitive!))) |
48ad85fb | 86 | (add-interesting-primitive! 'class-of)) |
aec4a84a | 87 | |
78ec533c | 88 | ;; Then load the rest of GOOPS |
583a23bf AW |
89 | (use-modules (oop goops dispatch)) |
90 | ||
91 | ;;; | |
92 | ;;; Compiling next methods into method bodies | |
93 | ;;; | |
94 | ||
95 | ;;; So, for the reader: there basic idea is that, given that the | |
96 | ;;; semantics of `next-method' depend on the concrete types being | |
97 | ;;; dispatched, why not compile a specific procedure to handle each type | |
98 | ;;; combination that we see at runtime. | |
99 | ;;; | |
100 | ;;; In theory we can do much better than a bytecode compilation, because | |
101 | ;;; we know the *exact* types of the arguments. It's ideal for native | |
102 | ;;; compilation. A task for the future. | |
103 | ;;; | |
104 | ;;; I think this whole generic application mess would benefit from a | |
105 | ;;; strict MOP. | |
106 | ||
107 | (define (compute-cmethod methods types) | |
108 | (match methods | |
109 | ((method . methods) | |
110 | (cond | |
111 | ((is-a? method <accessor-method>) | |
112 | (match types | |
113 | ((class . _) | |
114 | (let* ((name (car (accessor-method-slot-definition method))) | |
115 | (g-n-s (assq name (slot-ref class 'getters-n-setters))) | |
116 | (init-thunk (cadr g-n-s)) | |
117 | (g-n-s (cddr g-n-s))) | |
118 | (match types | |
119 | ((class) | |
120 | (cond ((pair? g-n-s) | |
121 | (make-generic-bound-check-getter (car g-n-s))) | |
122 | (init-thunk | |
123 | (standard-get g-n-s)) | |
124 | (else | |
125 | (bound-check-get g-n-s)))) | |
126 | ((class value) | |
127 | (if (pair? g-n-s) | |
128 | (cadr g-n-s) | |
129 | (standard-set g-n-s)))))))) | |
130 | (else | |
131 | (let ((make-procedure (slot-ref method 'make-procedure))) | |
132 | (if make-procedure | |
133 | (make-procedure | |
134 | (if (null? methods) | |
135 | (lambda args | |
136 | (no-next-method (method-generic-function method) args)) | |
137 | (compute-cmethod methods types))) | |
138 | (method-procedure method)))))))) | |
14f1d9fe | 139 | |
14f1d9fe | 140 | \f |
f6ddf827 | 141 | (eval-when (expand load eval) |
abd6af11 | 142 | (define min-fixnum (- (expt 2 29))) |
b15dea68 | 143 | (define max-fixnum (- (expt 2 29) 1))) |
14f1d9fe MD |
144 | |
145 | ;; | |
146 | ;; goops-error | |
147 | ;; | |
148 | (define (goops-error format-string . args) | |
14f1d9fe MD |
149 | (scm-error 'goops-error #f format-string args '())) |
150 | ||
151 | ;; | |
152 | ;; is-a? | |
153 | ;; | |
154 | (define (is-a? obj class) | |
155 | (and (memq class (class-precedence-list (class-of obj))) #t)) | |
156 | ||
157 | ||
158 | ;;; | |
159 | ;;; {Meta classes} | |
160 | ;;; | |
161 | ||
162 | (define ensure-metaclass-with-supers | |
163 | (let ((table-of-metas '())) | |
164 | (lambda (meta-supers) | |
165 | (let ((entry (assoc meta-supers table-of-metas))) | |
166 | (if entry | |
167 | ;; Found a previously created metaclass | |
168 | (cdr entry) | |
169 | ;; Create a new meta-class which inherit from "meta-supers" | |
170 | (let ((new (make <class> #:dsupers meta-supers | |
171 | #:slots '() | |
172 | #:name (gensym "metaclass")))) | |
173 | (set! table-of-metas (cons (cons meta-supers new) table-of-metas)) | |
174 | new)))))) | |
175 | ||
9d019f9b | 176 | (define (ensure-metaclass supers) |
14f1d9fe MD |
177 | (if (null? supers) |
178 | <class> | |
179 | (let* ((all-metas (map (lambda (x) (class-of x)) supers)) | |
af35fc20 AW |
180 | (all-cpls (append-map (lambda (m) |
181 | (cdr (class-precedence-list m))) | |
182 | all-metas)) | |
14f1d9fe MD |
183 | (needed-metas '())) |
184 | ;; Find the most specific metaclasses. The new metaclass will be | |
185 | ;; a subclass of these. | |
186 | (for-each | |
187 | (lambda (meta) | |
188 | (if (and (not (member meta all-cpls)) | |
189 | (not (member meta needed-metas))) | |
190 | (set! needed-metas (append needed-metas (list meta))))) | |
191 | all-metas) | |
192 | ;; Now return a subclass of the metaclasses we found. | |
193 | (if (null? (cdr needed-metas)) | |
194 | (car needed-metas) ; If there's only one, just use it. | |
195 | (ensure-metaclass-with-supers needed-metas))))) | |
196 | ||
197 | ;;; | |
198 | ;;; {Classes} | |
199 | ;;; | |
200 | ||
201 | ;;; (define-class NAME (SUPER ...) SLOT-DEFINITION ... OPTION ...) | |
202 | ;;; | |
203 | ;;; SLOT-DEFINITION ::= SLOT-NAME | (SLOT-NAME OPTION ...) | |
204 | ;;; OPTION ::= KEYWORD VALUE | |
205 | ;;; | |
14f1d9fe | 206 | |
d31c5d19 AW |
207 | (define (kw-do-map mapper f kwargs) |
208 | (define (keywords l) | |
209 | (cond | |
210 | ((null? l) '()) | |
211 | ((or (null? (cdr l)) (not (keyword? (car l)))) | |
212 | (goops-error "malformed keyword arguments: ~a" kwargs)) | |
213 | (else (cons (car l) (keywords (cddr l)))))) | |
214 | (define (args l) | |
215 | (if (null? l) '() (cons (cadr l) (args (cddr l))))) | |
216 | ;; let* to check keywords first | |
217 | (let* ((k (keywords kwargs)) | |
218 | (a (args kwargs))) | |
219 | (mapper f k a))) | |
c31142ee | 220 | |
b3501b80 | 221 | (define (make-class supers slots . options) |
9d019f9b AW |
222 | (let* ((name (get-keyword #:name options (make-unbound))) |
223 | (supers (if (not (or-map (lambda (class) | |
224 | (memq <object> | |
225 | (class-precedence-list class))) | |
226 | supers)) | |
227 | (append supers (list <object>)) | |
228 | supers)) | |
229 | (metaclass (or (get-keyword #:metaclass options #f) | |
230 | (ensure-metaclass supers)))) | |
231 | ||
232 | ;; Verify that all direct slots are different and that we don't inherit | |
233 | ;; several time from the same class | |
234 | (let ((tmp1 (find-duplicate supers)) | |
235 | (tmp2 (find-duplicate (map slot-definition-name slots)))) | |
236 | (if tmp1 | |
237 | (goops-error "make-class: super class ~S is duplicate in class ~S" | |
238 | tmp1 name)) | |
239 | (if tmp2 | |
240 | (goops-error "make-class: slot ~S is duplicate in class ~S" | |
241 | tmp2 name))) | |
242 | ||
243 | ;; Everything seems correct, build the class | |
244 | (apply make metaclass | |
245 | #:dsupers supers | |
246 | #:slots slots | |
247 | #:name name | |
248 | options))) | |
14f1d9fe MD |
249 | |
250 | ;;; (class (SUPER ...) SLOT-DEFINITION ... OPTION ...) | |
251 | ;;; | |
252 | ;;; SLOT-DEFINITION ::= SLOT-NAME | (SLOT-NAME OPTION ...) | |
253 | ;;; OPTION ::= KEYWORD VALUE | |
254 | ;;; | |
d31c5d19 AW |
255 | (define-macro (class supers . slots) |
256 | (define (make-slot-definition-forms slots) | |
257 | (map | |
258 | (lambda (def) | |
259 | (cond | |
260 | ((pair? def) | |
261 | `(list ',(car def) | |
262 | ,@(kw-do-map append-map | |
263 | (lambda (kw arg) | |
264 | (case kw | |
265 | ((#:init-form) | |
266 | `(#:init-form ',arg | |
267 | #:init-thunk (lambda () ,arg))) | |
268 | (else (list kw arg)))) | |
269 | (cdr def)))) | |
270 | (else | |
271 | `(list ',def)))) | |
272 | slots)) | |
d31c5d19 AW |
273 | (if (not (list? supers)) |
274 | (goops-error "malformed superclass list: ~S" supers)) | |
a2ca7252 | 275 | (let ((slots (take-while (lambda (x) (not (keyword? x))) slots)) |
d31c5d19 AW |
276 | (options (or (find-tail keyword? slots) '()))) |
277 | `(make-class | |
278 | ;; evaluate super class variables | |
279 | (list ,@supers) | |
280 | ;; evaluate slot definitions, except the slot name! | |
281 | (list ,@(make-slot-definition-forms slots)) | |
282 | ;; evaluate class options | |
283 | ,@options))) | |
14f1d9fe | 284 | |
b3501b80 AW |
285 | (define-syntax define-class-pre-definition |
286 | (lambda (x) | |
287 | (syntax-case x () | |
288 | ((_ (k arg rest ...) out ...) | |
0dd8493c AW |
289 | (keyword? (syntax->datum #'k)) |
290 | (case (syntax->datum #'k) | |
b3501b80 | 291 | ((#:getter #:setter) |
0dd8493c AW |
292 | #'(define-class-pre-definition (rest ...) |
293 | out ... | |
294 | (if (or (not (defined? 'arg)) | |
295 | (not (is-a? arg <generic>))) | |
296 | (toplevel-define! | |
297 | 'arg | |
298 | (ensure-generic (if (defined? 'arg) arg #f) 'arg))))) | |
b3501b80 | 299 | ((#:accessor) |
0dd8493c AW |
300 | #'(define-class-pre-definition (rest ...) |
301 | out ... | |
302 | (if (or (not (defined? 'arg)) | |
303 | (not (is-a? arg <accessor>))) | |
304 | (toplevel-define! | |
305 | 'arg | |
306 | (ensure-accessor (if (defined? 'arg) arg #f) 'arg))))) | |
b3501b80 | 307 | (else |
0dd8493c | 308 | #'(define-class-pre-definition (rest ...) out ...)))) |
b3501b80 | 309 | ((_ () out ...) |
0dd8493c | 310 | #'(begin out ...))))) |
b3501b80 AW |
311 | |
312 | ;; Some slot options require extra definitions to be made. In | |
313 | ;; particular, we want to make sure that the generic function objects | |
314 | ;; which represent accessors exist before `make-class' tries to add | |
315 | ;; methods to them. | |
316 | (define-syntax define-class-pre-definitions | |
317 | (lambda (x) | |
318 | (syntax-case x () | |
319 | ((_ () out ...) | |
0dd8493c | 320 | #'(begin out ...)) |
b3501b80 | 321 | ((_ (slot rest ...) out ...) |
0dd8493c AW |
322 | (keyword? (syntax->datum #'slot)) |
323 | #'(begin out ...)) | |
b3501b80 | 324 | ((_ (slot rest ...) out ...) |
0dd8493c AW |
325 | (identifier? #'slot) |
326 | #'(define-class-pre-definitions (rest ...) | |
327 | out ...)) | |
b3501b80 | 328 | ((_ ((slotname slotopt ...) rest ...) out ...) |
0dd8493c AW |
329 | #'(define-class-pre-definitions (rest ...) |
330 | out ... (define-class-pre-definition (slotopt ...))))))) | |
b3501b80 | 331 | |
0c65f52c AW |
332 | (define-syntax-rule (define-class name supers slot ...) |
333 | (begin | |
334 | (define-class-pre-definitions (slot ...)) | |
335 | (if (and (defined? 'name) | |
336 | (is-a? name <class>) | |
337 | (memq <object> (class-precedence-list name))) | |
338 | (class-redefinition name | |
339 | (class supers slot ... #:name 'name)) | |
340 | (toplevel-define! 'name (class supers slot ... #:name 'name))))) | |
b3501b80 | 341 | |
0c65f52c AW |
342 | (define-syntax-rule (standard-define-class arg ...) |
343 | (define-class arg ...)) | |
14f1d9fe MD |
344 | |
345 | ;;; | |
346 | ;;; {Generic functions and accessors} | |
347 | ;;; | |
348 | ||
1d83f47e AW |
349 | ;; Apparently the desired semantics are that we extend previous |
350 | ;; procedural definitions, but that if `name' was already a generic, we | |
351 | ;; overwrite its definition. | |
352 | (define-macro (define-generic name) | |
353 | (if (not (symbol? name)) | |
354 | (goops-error "bad generic function name: ~S" name)) | |
355 | `(define ,name | |
356 | (if (and (defined? ',name) (is-a? ,name <generic>)) | |
357 | (make <generic> #:name ',name) | |
358 | (ensure-generic (if (defined? ',name) ,name #f) ',name)))) | |
359 | ||
360 | (define-macro (define-extended-generic name val) | |
361 | (if (not (symbol? name)) | |
362 | (goops-error "bad generic function name: ~S" name)) | |
363 | `(define ,name (make-extended-generic ,val ',name))) | |
364 | ||
365 | (define-macro (define-extended-generics names . args) | |
366 | (let ((prefixes (get-keyword #:prefix args #f))) | |
367 | (if prefixes | |
368 | `(begin | |
369 | ,@(map (lambda (name) | |
370 | `(define-extended-generic ,name | |
371 | (list ,@(map (lambda (prefix) | |
372 | (symbol-append prefix name)) | |
373 | prefixes)))) | |
374 | names)) | |
375 | (goops-error "no prefixes supplied")))) | |
bbf8d523 | 376 | |
a8c10aa1 AW |
377 | (define* (make-generic #:optional name) |
378 | (make <generic> #:name name)) | |
14f1d9fe | 379 | |
a8c10aa1 AW |
380 | (define* (make-extended-generic gfs #:optional name) |
381 | (let* ((gfs (if (list? gfs) gfs (list gfs))) | |
bbf8d523 MD |
382 | (gws? (any (lambda (gf) (is-a? gf <generic-with-setter>)) gfs))) |
383 | (let ((ans (if gws? | |
384 | (let* ((sname (and name (make-setter-name name))) | |
385 | (setters | |
af35fc20 | 386 | (append-map (lambda (gf) |
bbf8d523 MD |
387 | (if (is-a? gf <generic-with-setter>) |
388 | (list (ensure-generic (setter gf) | |
389 | sname)) | |
390 | '())) | |
af35fc20 | 391 | gfs)) |
bbf8d523 MD |
392 | (es (make <extended-generic-with-setter> |
393 | #:name name | |
394 | #:extends gfs | |
395 | #:setter (make <extended-generic> | |
396 | #:name sname | |
397 | #:extends setters)))) | |
398 | (extended-by! setters (setter es)) | |
399 | es) | |
400 | (make <extended-generic> | |
401 | #:name name | |
402 | #:extends gfs)))) | |
403 | (extended-by! gfs ans) | |
404 | ans))) | |
405 | ||
406 | (define (extended-by! gfs eg) | |
407 | (for-each (lambda (gf) | |
408 | (slot-set! gf 'extended-by | |
409 | (cons eg (slot-ref gf 'extended-by)))) | |
eddd81f4 AW |
410 | gfs) |
411 | (invalidate-method-cache! eg)) | |
bbf8d523 MD |
412 | |
413 | (define (not-extended-by! gfs eg) | |
414 | (for-each (lambda (gf) | |
415 | (slot-set! gf 'extended-by | |
416 | (delq! eg (slot-ref gf 'extended-by)))) | |
eddd81f4 AW |
417 | gfs) |
418 | (invalidate-method-cache! eg)) | |
bbf8d523 | 419 | |
a8c10aa1 AW |
420 | (define* (ensure-generic old-definition #:optional name) |
421 | (cond ((is-a? old-definition <generic>) old-definition) | |
422 | ((procedure-with-setter? old-definition) | |
423 | (make <generic-with-setter> | |
424 | #:name name | |
425 | #:default (procedure old-definition) | |
426 | #:setter (setter old-definition))) | |
427 | ((procedure? old-definition) | |
428 | (if (generic-capability? old-definition) old-definition | |
429 | (make <generic> #:name name #:default old-definition))) | |
430 | (else (make <generic> #:name name)))) | |
14f1d9fe | 431 | |
1d83f47e | 432 | ;; same semantics as <generic> |
0c65f52c AW |
433 | (define-syntax-rule (define-accessor name) |
434 | (define name | |
435 | (cond ((not (defined? 'name)) (ensure-accessor #f 'name)) | |
436 | ((is-a? name <accessor>) (make <accessor> #:name 'name)) | |
437 | (else (ensure-accessor name 'name))))) | |
c31142ee | 438 | |
14f1d9fe MD |
439 | (define (make-setter-name name) |
440 | (string->symbol (string-append "setter:" (symbol->string name)))) | |
441 | ||
a8c10aa1 AW |
442 | (define* (make-accessor #:optional name) |
443 | (make <accessor> | |
444 | #:name name | |
445 | #:setter (make <generic> | |
446 | #:name (and name (make-setter-name name))))) | |
447 | ||
448 | (define* (ensure-accessor proc #:optional name) | |
449 | (cond ((and (is-a? proc <accessor>) | |
450 | (is-a? (setter proc) <generic>)) | |
451 | proc) | |
452 | ((is-a? proc <generic-with-setter>) | |
453 | (upgrade-accessor proc (setter proc))) | |
454 | ((is-a? proc <generic>) | |
455 | (upgrade-accessor proc (make-generic name))) | |
456 | ((procedure-with-setter? proc) | |
457 | (make <accessor> | |
458 | #:name name | |
459 | #:default (procedure proc) | |
460 | #:setter (ensure-generic (setter proc) name))) | |
461 | ((procedure? proc) | |
462 | (ensure-accessor (if (generic-capability? proc) | |
463 | (make <generic> #:name name #:default proc) | |
464 | (ensure-generic proc name)) | |
465 | name)) | |
466 | (else | |
467 | (make-accessor name)))) | |
14f1d9fe | 468 | |
f8af5c6d | 469 | (define (upgrade-accessor generic setter) |
bbf8d523 MD |
470 | (let ((methods (slot-ref generic 'methods)) |
471 | (gws (make (if (is-a? generic <extended-generic>) | |
472 | <extended-generic-with-setter> | |
f8af5c6d | 473 | <accessor>) |
14f1d9fe | 474 | #:name (generic-function-name generic) |
bbf8d523 | 475 | #:extended-by (slot-ref generic 'extended-by) |
14f1d9fe | 476 | #:setter setter))) |
bbf8d523 MD |
477 | (if (is-a? generic <extended-generic>) |
478 | (let ((gfs (slot-ref generic 'extends))) | |
479 | (not-extended-by! gfs generic) | |
480 | (slot-set! gws 'extends gfs) | |
481 | (extended-by! gfs gws))) | |
14f1d9fe MD |
482 | ;; Steal old methods |
483 | (for-each (lambda (method) | |
484 | (slot-set! method 'generic-function gws)) | |
485 | methods) | |
486 | (slot-set! gws 'methods methods) | |
eddd81f4 | 487 | (invalidate-method-cache! gws) |
14f1d9fe MD |
488 | gws)) |
489 | ||
490 | ;;; | |
491 | ;;; {Methods} | |
492 | ;;; | |
493 | ||
2ce560b9 AW |
494 | (define (toplevel-define! name val) |
495 | (module-define! (current-module) name val)) | |
496 | ||
497 | (define-syntax define-method | |
498 | (syntax-rules (setter) | |
499 | ((_ ((setter name) . args) body ...) | |
500 | (begin | |
501 | (if (or (not (defined? 'name)) | |
502 | (not (is-a? name <accessor>))) | |
503 | (toplevel-define! 'name | |
504 | (ensure-accessor | |
505 | (if (defined? 'name) name #f) 'name))) | |
506 | (add-method! (setter name) (method args body ...)))) | |
507 | ((_ (name . args) body ...) | |
508 | (begin | |
509 | ;; FIXME: this code is how it always was, but it's quite cracky: | |
510 | ;; it will only define the generic function if it was undefined | |
511 | ;; before (ok), or *was defined to #f*. The latter is crack. But | |
512 | ;; there are bootstrap issues about fixing this -- change it to | |
513 | ;; (is-a? name <generic>) and see. | |
514 | (if (or (not (defined? 'name)) | |
515 | (not name)) | |
516 | (toplevel-define! 'name (make <generic> #:name 'name))) | |
517 | (add-method! name (method args body ...)))))) | |
14f1d9fe | 518 | |
47c8983f AW |
519 | (define-syntax method |
520 | (lambda (x) | |
d6392715 AW |
521 | (define (parse-args args) |
522 | (let lp ((ls args) (formals '()) (specializers '())) | |
47c8983f | 523 | (syntax-case ls () |
d6392715 | 524 | (((f s) . rest) |
0dd8493c AW |
525 | (and (identifier? #'f) (identifier? #'s)) |
526 | (lp #'rest | |
527 | (cons #'f formals) | |
528 | (cons #'s specializers))) | |
d6392715 | 529 | ((f . rest) |
0dd8493c AW |
530 | (identifier? #'f) |
531 | (lp #'rest | |
532 | (cons #'f formals) | |
533 | (cons #'<top> specializers))) | |
d6392715 AW |
534 | (() |
535 | (list (reverse formals) | |
0dd8493c | 536 | (reverse (cons #''() specializers)))) |
d6392715 | 537 | (tail |
0dd8493c AW |
538 | (identifier? #'tail) |
539 | (list (append (reverse formals) #'tail) | |
540 | (reverse (cons #'<top> specializers))))))) | |
47c8983f AW |
541 | |
542 | (define (find-free-id exp referent) | |
543 | (syntax-case exp () | |
544 | ((x . y) | |
0dd8493c AW |
545 | (or (find-free-id #'x referent) |
546 | (find-free-id #'y referent))) | |
47c8983f | 547 | (x |
0dd8493c AW |
548 | (identifier? #'x) |
549 | (let ((id (datum->syntax #'x referent))) | |
550 | (and (free-identifier=? #'x id) id))) | |
47c8983f AW |
551 | (_ #f))) |
552 | ||
553 | (define (compute-procedure formals body) | |
554 | (syntax-case body () | |
555 | ((body0 ...) | |
556 | (with-syntax ((formals formals)) | |
0dd8493c | 557 | #'(lambda formals body0 ...))))) |
47c8983f AW |
558 | |
559 | (define (->proper args) | |
560 | (let lp ((ls args) (out '())) | |
561 | (syntax-case ls () | |
0dd8493c | 562 | ((x . xs) (lp #'xs (cons #'x out))) |
47c8983f | 563 | (() (reverse out)) |
0dd8493c | 564 | (tail (reverse (cons #'tail out)))))) |
47c8983f AW |
565 | |
566 | (define (compute-make-procedure formals body next-method) | |
567 | (syntax-case body () | |
568 | ((body ...) | |
569 | (with-syntax ((next-method next-method)) | |
570 | (syntax-case formals () | |
571 | ((formal ...) | |
0dd8493c AW |
572 | #'(lambda (real-next-method) |
573 | (lambda (formal ...) | |
574 | (let ((next-method (lambda args | |
575 | (if (null? args) | |
576 | (real-next-method formal ...) | |
577 | (apply real-next-method args))))) | |
578 | body ...)))) | |
47c8983f | 579 | (formals |
0dd8493c AW |
580 | (with-syntax (((formal ...) (->proper #'formals))) |
581 | #'(lambda (real-next-method) | |
582 | (lambda formals | |
583 | (let ((next-method (lambda args | |
584 | (if (null? args) | |
585 | (apply real-next-method formal ...) | |
586 | (apply real-next-method args))))) | |
587 | body ...)))))))))) | |
47c8983f AW |
588 | |
589 | (define (compute-procedures formals body) | |
590 | ;; So, our use of this is broken, because it operates on the | |
591 | ;; pre-expansion source code. It's equivalent to just searching | |
592 | ;; for referent in the datums. Ah well. | |
593 | (let ((id (find-free-id body 'next-method))) | |
594 | (if id | |
595 | ;; return a make-procedure | |
0dd8493c | 596 | (values #'#f |
47c8983f AW |
597 | (compute-make-procedure formals body id)) |
598 | (values (compute-procedure formals body) | |
0dd8493c | 599 | #'#f)))) |
47c8983f AW |
600 | |
601 | (syntax-case x () | |
0dd8493c | 602 | ((_ args) #'(method args (if #f #f))) |
47c8983f | 603 | ((_ args body0 body1 ...) |
0dd8493c | 604 | (with-syntax (((formals (specializer ...)) (parse-args #'args))) |
47c8983f AW |
605 | (call-with-values |
606 | (lambda () | |
0dd8493c | 607 | (compute-procedures #'formals #'(body0 body1 ...))) |
47c8983f AW |
608 | (lambda (procedure make-procedure) |
609 | (with-syntax ((procedure procedure) | |
610 | (make-procedure make-procedure)) | |
0dd8493c AW |
611 | #'(make <method> |
612 | #:specializers (cons* specializer ...) | |
613 | #:formals 'formals | |
614 | #:body '(body0 body1 ...) | |
615 | #:make-procedure make-procedure | |
616 | #:procedure procedure))))))))) | |
14f1d9fe MD |
617 | |
618 | ;;; | |
619 | ;;; {add-method!} | |
620 | ;;; | |
621 | ||
622 | (define (add-method-in-classes! m) | |
623 | ;; Add method in all the classes which appears in its specializers list | |
624 | (for-each* (lambda (x) | |
625 | (let ((dm (class-direct-methods x))) | |
81600208 | 626 | (if (not (memq m dm)) |
14f1d9fe MD |
627 | (slot-set! x 'direct-methods (cons m dm))))) |
628 | (method-specializers m))) | |
629 | ||
630 | (define (remove-method-in-classes! m) | |
631 | ;; Remove method in all the classes which appears in its specializers list | |
632 | (for-each* (lambda (x) | |
633 | (slot-set! x | |
634 | 'direct-methods | |
635 | (delv! m (class-direct-methods x)))) | |
636 | (method-specializers m))) | |
637 | ||
638 | (define (compute-new-list-of-methods gf new) | |
639 | (let ((new-spec (method-specializers new)) | |
bbf8d523 | 640 | (methods (slot-ref gf 'methods))) |
14f1d9fe MD |
641 | (let loop ((l methods)) |
642 | (if (null? l) | |
643 | (cons new methods) | |
644 | (if (equal? (method-specializers (car l)) new-spec) | |
645 | (begin | |
646 | ;; This spec. list already exists. Remove old method from dependents | |
647 | (remove-method-in-classes! (car l)) | |
648 | (set-car! l new) | |
649 | methods) | |
650 | (loop (cdr l))))))) | |
651 | ||
eddd81f4 AW |
652 | (define (method-n-specializers m) |
653 | (length* (slot-ref m 'specializers))) | |
654 | ||
655 | (define (calculate-n-specialized gf) | |
656 | (fold (lambda (m n) (max n (method-n-specializers m))) | |
657 | 0 | |
658 | (generic-function-methods gf))) | |
659 | ||
660 | (define (invalidate-method-cache! gf) | |
661 | (%invalidate-method-cache! gf) | |
662 | (slot-set! gf 'n-specialized (calculate-n-specialized gf)) | |
663 | (for-each (lambda (gf) (invalidate-method-cache! gf)) | |
664 | (slot-ref gf 'extended-by))) | |
665 | ||
7d38f3d8 AW |
666 | (define internal-add-method! |
667 | (method ((gf <generic>) (m <method>)) | |
668 | (slot-set! m 'generic-function gf) | |
669 | (slot-set! gf 'methods (compute-new-list-of-methods gf m)) | |
eddd81f4 | 670 | (invalidate-method-cache! gf) |
7d38f3d8 AW |
671 | (add-method-in-classes! m) |
672 | *unspecified*)) | |
14f1d9fe MD |
673 | |
674 | (define-generic add-method!) | |
675 | ||
7d38f3d8 | 676 | ((method-procedure internal-add-method!) add-method! internal-add-method!) |
14f1d9fe | 677 | |
71d540f7 | 678 | (define-method (add-method! (proc <procedure>) (m <method>)) |
14f1d9fe MD |
679 | (if (generic-capability? proc) |
680 | (begin | |
681 | (enable-primitive-generic! proc) | |
682 | (add-method! proc m)) | |
683 | (next-method))) | |
684 | ||
71d540f7 | 685 | (define-method (add-method! (pg <primitive-generic>) (m <method>)) |
14f1d9fe MD |
686 | (add-method! (primitive-generic-generic pg) m)) |
687 | ||
71d540f7 | 688 | (define-method (add-method! obj (m <method>)) |
14f1d9fe MD |
689 | (goops-error "~S is not a valid generic function" obj)) |
690 | ||
691 | ;;; | |
692 | ;;; {Access to meta objects} | |
693 | ;;; | |
694 | ||
695 | ;;; | |
696 | ;;; Methods | |
697 | ;;; | |
71d540f7 | 698 | (define-method (method-source (m <method>)) |
14f1d9fe | 699 | (let* ((spec (map* class-name (slot-ref m 'specializers))) |
4e2f1e9e AW |
700 | (src (procedure-source (slot-ref m 'procedure)))) |
701 | (and src | |
702 | (let ((args (cadr src)) | |
703 | (body (cddr src))) | |
704 | (cons 'method | |
705 | (cons (map* list args spec) | |
706 | body)))))) | |
707 | ||
708 | (define-method (method-formals (m <method>)) | |
709 | (slot-ref m 'formals)) | |
14f1d9fe MD |
710 | |
711 | ;;; | |
712 | ;;; Slots | |
713 | ;;; | |
714 | (define slot-definition-name car) | |
715 | ||
716 | (define slot-definition-options cdr) | |
717 | ||
718 | (define (slot-definition-allocation s) | |
719 | (get-keyword #:allocation (cdr s) #:instance)) | |
720 | ||
721 | (define (slot-definition-getter s) | |
722 | (get-keyword #:getter (cdr s) #f)) | |
723 | ||
724 | (define (slot-definition-setter s) | |
725 | (get-keyword #:setter (cdr s) #f)) | |
726 | ||
727 | (define (slot-definition-accessor s) | |
728 | (get-keyword #:accessor (cdr s) #f)) | |
729 | ||
730 | (define (slot-definition-init-value s) | |
731 | ;; can be #f, so we can't use #f as non-value | |
732 | (get-keyword #:init-value (cdr s) (make-unbound))) | |
733 | ||
734 | (define (slot-definition-init-form s) | |
735 | (get-keyword #:init-form (cdr s) (make-unbound))) | |
736 | ||
737 | (define (slot-definition-init-thunk s) | |
738 | (get-keyword #:init-thunk (cdr s) #f)) | |
739 | ||
740 | (define (slot-definition-init-keyword s) | |
741 | (get-keyword #:init-keyword (cdr s) #f)) | |
742 | ||
743 | (define (class-slot-definition class slot-name) | |
744 | (assq slot-name (class-slots class))) | |
745 | ||
746 | (define (slot-init-function class slot-name) | |
747 | (cadr (assq slot-name (slot-ref class 'getters-n-setters)))) | |
748 | ||
51f66c91 AW |
749 | (define (accessor-method-slot-definition obj) |
750 | "Return the slot definition of the accessor @var{obj}." | |
751 | (slot-ref obj 'slot-definition)) | |
752 | ||
14f1d9fe MD |
753 | |
754 | ;;; | |
755 | ;;; {Standard methods used by the C runtime} | |
756 | ;;; | |
757 | ||
758 | ;;; Methods to compare objects | |
759 | ;;; | |
760 | ||
9f63ce02 AW |
761 | ;; Have to do this in a strange order because equal? is used in the |
762 | ;; add-method! implementation; we need to make sure that when the | |
763 | ;; primitive is extended, that the generic has a method. = | |
764 | (define g-equal? (make-generic 'equal?)) | |
765 | ;; When this generic gets called, we will have already checked eq? and | |
766 | ;; eqv? -- the purpose of this generic is to extend equality. So by | |
767 | ;; default, there is no extension, thus the #f return. | |
768 | (add-method! g-equal? (method (x y) #f)) | |
769 | (set-primitive-generic! equal? g-equal?) | |
a48d60b1 | 770 | |
14f1d9fe MD |
771 | ;;; |
772 | ;;; methods to display/write an object | |
773 | ;;; | |
774 | ||
775 | ; Code for writing objects must test that the slots they use are | |
776 | ; bound. Otherwise a slot-unbound method will be called and will | |
777 | ; conduct to an infinite loop. | |
778 | ||
779 | ;; Write | |
780 | (define (display-address o file) | |
781 | (display (number->string (object-address o) 16) file)) | |
782 | ||
71d540f7 | 783 | (define-method (write o file) |
14f1d9fe MD |
784 | (display "#<instance " file) |
785 | (display-address o file) | |
786 | (display #\> file)) | |
787 | ||
788 | (define write-object (primitive-generic-generic write)) | |
789 | ||
71d540f7 | 790 | (define-method (write (o <object>) file) |
14f1d9fe MD |
791 | (let ((class (class-of o))) |
792 | (if (slot-bound? class 'name) | |
793 | (begin | |
794 | (display "#<" file) | |
795 | (display (class-name class) file) | |
796 | (display #\space file) | |
797 | (display-address o file) | |
798 | (display #\> file)) | |
799 | (next-method)))) | |
800 | ||
71d540f7 | 801 | (define-method (write (class <class>) file) |
14f1d9fe MD |
802 | (let ((meta (class-of class))) |
803 | (if (and (slot-bound? class 'name) | |
804 | (slot-bound? meta 'name)) | |
805 | (begin | |
806 | (display "#<" file) | |
807 | (display (class-name meta) file) | |
808 | (display #\space file) | |
809 | (display (class-name class) file) | |
810 | (display #\space file) | |
811 | (display-address class file) | |
812 | (display #\> file)) | |
813 | (next-method)))) | |
814 | ||
71d540f7 | 815 | (define-method (write (gf <generic>) file) |
14f1d9fe MD |
816 | (let ((meta (class-of gf))) |
817 | (if (and (slot-bound? meta 'name) | |
818 | (slot-bound? gf 'methods)) | |
819 | (begin | |
820 | (display "#<" file) | |
821 | (display (class-name meta) file) | |
822 | (let ((name (generic-function-name gf))) | |
823 | (if name | |
824 | (begin | |
825 | (display #\space file) | |
826 | (display name file)))) | |
827 | (display " (" file) | |
828 | (display (length (generic-function-methods gf)) file) | |
829 | (display ")>" file)) | |
830 | (next-method)))) | |
831 | ||
71d540f7 | 832 | (define-method (write (o <method>) file) |
14f1d9fe MD |
833 | (let ((meta (class-of o))) |
834 | (if (and (slot-bound? meta 'name) | |
835 | (slot-bound? o 'specializers)) | |
836 | (begin | |
837 | (display "#<" file) | |
838 | (display (class-name meta) file) | |
839 | (display #\space file) | |
840 | (display (map* (lambda (spec) | |
841 | (if (slot-bound? spec 'name) | |
842 | (slot-ref spec 'name) | |
843 | spec)) | |
844 | (method-specializers o)) | |
845 | file) | |
846 | (display #\space file) | |
847 | (display-address o file) | |
848 | (display #\> file)) | |
849 | (next-method)))) | |
850 | ||
851 | ;; Display (do the same thing as write by default) | |
71d540f7 | 852 | (define-method (display o file) |
14f1d9fe MD |
853 | (write-object o file)) |
854 | ||
7b07e5ef MD |
855 | ;;; |
856 | ;;; Handling of duplicate bindings in the module system | |
857 | ;;; | |
858 | ||
859 | (define-method (merge-generics (module <module>) | |
860 | (name <symbol>) | |
861 | (int1 <module>) | |
862 | (val1 <top>) | |
863 | (int2 <module>) | |
864 | (val2 <top>) | |
865 | (var <top>) | |
866 | (val <top>)) | |
867 | #f) | |
868 | ||
869 | (define-method (merge-generics (module <module>) | |
870 | (name <symbol>) | |
871 | (int1 <module>) | |
872 | (val1 <generic>) | |
873 | (int2 <module>) | |
874 | (val2 <generic>) | |
875 | (var <top>) | |
876 | (val <boolean>)) | |
c9fa1748 MD |
877 | (and (not (eq? val1 val2)) |
878 | (make-variable (make-extended-generic (list val2 val1) name)))) | |
7b07e5ef MD |
879 | |
880 | (define-method (merge-generics (module <module>) | |
881 | (name <symbol>) | |
882 | (int1 <module>) | |
883 | (val1 <generic>) | |
884 | (int2 <module>) | |
885 | (val2 <generic>) | |
886 | (var <top>) | |
887 | (gf <extended-generic>)) | |
c9fa1748 MD |
888 | (and (not (memq val2 (slot-ref gf 'extends))) |
889 | (begin | |
890 | (slot-set! gf | |
891 | 'extends | |
892 | (cons val2 (delq! val2 (slot-ref gf 'extends)))) | |
893 | (slot-set! val2 | |
894 | 'extended-by | |
895 | (cons gf (delq! gf (slot-ref val2 'extended-by)))) | |
eddd81f4 | 896 | (invalidate-method-cache! gf) |
c9fa1748 | 897 | var))) |
7b07e5ef MD |
898 | |
899 | (module-define! duplicate-handlers 'merge-generics merge-generics) | |
900 | ||
f8af5c6d MD |
901 | (define-method (merge-accessors (module <module>) |
902 | (name <symbol>) | |
903 | (int1 <module>) | |
904 | (val1 <top>) | |
905 | (int2 <module>) | |
906 | (val2 <top>) | |
907 | (var <top>) | |
908 | (val <top>)) | |
909 | #f) | |
910 | ||
911 | (define-method (merge-accessors (module <module>) | |
912 | (name <symbol>) | |
913 | (int1 <module>) | |
914 | (val1 <accessor>) | |
915 | (int2 <module>) | |
916 | (val2 <accessor>) | |
917 | (var <top>) | |
918 | (val <top>)) | |
919 | (merge-generics module name int1 val1 int2 val2 var val)) | |
920 | ||
921 | (module-define! duplicate-handlers 'merge-accessors merge-accessors) | |
922 | ||
14f1d9fe MD |
923 | ;;; |
924 | ;;; slot access | |
925 | ;;; | |
926 | ||
927 | (define (class-slot-g-n-s class slot-name) | |
928 | (let* ((this-slot (assq slot-name (slot-ref class 'slots))) | |
929 | (g-n-s (cddr (or (assq slot-name (slot-ref class 'getters-n-setters)) | |
930 | (slot-missing class slot-name))))) | |
931 | (if (not (memq (slot-definition-allocation this-slot) | |
932 | '(#:class #:each-subclass))) | |
933 | (slot-missing class slot-name)) | |
934 | g-n-s)) | |
935 | ||
936 | (define (class-slot-ref class slot) | |
937 | (let ((x ((car (class-slot-g-n-s class slot)) #f))) | |
938 | (if (unbound? x) | |
939 | (slot-unbound class slot) | |
940 | x))) | |
941 | ||
942 | (define (class-slot-set! class slot value) | |
943 | ((cadr (class-slot-g-n-s class slot)) #f value)) | |
944 | ||
71d540f7 | 945 | (define-method (slot-unbound (c <class>) (o <object>) s) |
14f1d9fe MD |
946 | (goops-error "Slot `~S' is unbound in object ~S" s o)) |
947 | ||
71d540f7 | 948 | (define-method (slot-unbound (c <class>) s) |
14f1d9fe MD |
949 | (goops-error "Slot `~S' is unbound in class ~S" s c)) |
950 | ||
71d540f7 | 951 | (define-method (slot-unbound (o <object>)) |
14f1d9fe MD |
952 | (goops-error "Unbound slot in object ~S" o)) |
953 | ||
71d540f7 | 954 | (define-method (slot-missing (c <class>) (o <object>) s) |
14f1d9fe MD |
955 | (goops-error "No slot with name `~S' in object ~S" s o)) |
956 | ||
71d540f7 | 957 | (define-method (slot-missing (c <class>) s) |
14f1d9fe MD |
958 | (goops-error "No class slot with name `~S' in class ~S" s c)) |
959 | ||
960 | ||
71d540f7 | 961 | (define-method (slot-missing (c <class>) (o <object>) s value) |
14f1d9fe MD |
962 | (slot-missing c o s)) |
963 | ||
964 | ;;; Methods for the possible error we can encounter when calling a gf | |
965 | ||
71d540f7 | 966 | (define-method (no-next-method (gf <generic>) args) |
14f1d9fe MD |
967 | (goops-error "No next method when calling ~S\nwith arguments ~S" gf args)) |
968 | ||
71d540f7 | 969 | (define-method (no-applicable-method (gf <generic>) args) |
14f1d9fe MD |
970 | (goops-error "No applicable method for ~S in call ~S" |
971 | gf (cons (generic-function-name gf) args))) | |
972 | ||
71d540f7 | 973 | (define-method (no-method (gf <generic>) args) |
14f1d9fe MD |
974 | (goops-error "No method defined for ~S" gf)) |
975 | ||
976 | ;;; | |
977 | ;;; {Cloning functions (from rdeline@CS.CMU.EDU)} | |
978 | ;;; | |
979 | ||
71d540f7 | 980 | (define-method (shallow-clone (self <object>)) |
14f1d9fe MD |
981 | (let ((clone (%allocate-instance (class-of self) '())) |
982 | (slots (map slot-definition-name | |
983 | (class-slots (class-of self))))) | |
984 | (for-each (lambda (slot) | |
985 | (if (slot-bound? self slot) | |
986 | (slot-set! clone slot (slot-ref self slot)))) | |
987 | slots) | |
988 | clone)) | |
989 | ||
71d540f7 | 990 | (define-method (deep-clone (self <object>)) |
14f1d9fe MD |
991 | (let ((clone (%allocate-instance (class-of self) '())) |
992 | (slots (map slot-definition-name | |
993 | (class-slots (class-of self))))) | |
994 | (for-each (lambda (slot) | |
995 | (if (slot-bound? self slot) | |
996 | (slot-set! clone slot | |
997 | (let ((value (slot-ref self slot))) | |
998 | (if (instance? value) | |
999 | (deep-clone value) | |
1000 | value))))) | |
1001 | slots) | |
1002 | clone)) | |
1003 | ||
1004 | ;;; | |
1005 | ;;; {Class redefinition utilities} | |
1006 | ;;; | |
1007 | ||
1008 | ;;; (class-redefinition OLD NEW) | |
1009 | ;;; | |
1010 | ||
1011 | ;;; Has correct the following conditions: | |
1012 | ||
1013 | ;;; Methods | |
1014 | ;;; | |
1015 | ;;; 1. New accessor specializers refer to new header | |
1016 | ;;; | |
1017 | ;;; Classes | |
1018 | ;;; | |
1019 | ;;; 1. New class cpl refers to the new class header | |
1020 | ;;; 2. Old class header exists on old super classes direct-subclass lists | |
1021 | ;;; 3. New class header exists on new super classes direct-subclass lists | |
1022 | ||
71d540f7 | 1023 | (define-method (class-redefinition (old <class>) (new <class>)) |
14f1d9fe MD |
1024 | ;; Work on direct methods: |
1025 | ;; 1. Remove accessor methods from the old class | |
1026 | ;; 2. Patch the occurences of new in the specializers by old | |
1027 | ;; 3. Displace the methods from old to new | |
1028 | (remove-class-accessors! old) ;; -1- | |
1029 | (let ((methods (class-direct-methods new))) | |
1030 | (for-each (lambda (m) | |
1031 | (update-direct-method! m new old)) ;; -2- | |
1032 | methods) | |
1033 | (slot-set! new | |
1034 | 'direct-methods | |
1035 | (append methods (class-direct-methods old)))) | |
1036 | ||
1037 | ;; Substitute old for new in new cpl | |
1038 | (set-car! (slot-ref new 'cpl) old) | |
1039 | ||
1040 | ;; Remove the old class from the direct-subclasses list of its super classes | |
1041 | (for-each (lambda (c) (slot-set! c 'direct-subclasses | |
1042 | (delv! old (class-direct-subclasses c)))) | |
1043 | (class-direct-supers old)) | |
1044 | ||
1045 | ;; Replace the new class with the old in the direct-subclasses of the supers | |
1046 | (for-each (lambda (c) | |
1047 | (slot-set! c 'direct-subclasses | |
1048 | (cons old (delv! new (class-direct-subclasses c))))) | |
1049 | (class-direct-supers new)) | |
1050 | ||
1051 | ;; Swap object headers | |
1052 | (%modify-class old new) | |
1053 | ||
1054 | ;; Now old is NEW! | |
1055 | ||
1056 | ;; Redefine all the subclasses of old to take into account modification | |
1057 | (for-each | |
1058 | (lambda (c) | |
1059 | (update-direct-subclass! c new old)) | |
1060 | (class-direct-subclasses new)) | |
1061 | ||
1062 | ;; Invalidate class so that subsequent instances slot accesses invoke | |
1063 | ;; change-object-class | |
1064 | (slot-set! new 'redefined old) | |
1065 | (%invalidate-class new) ;must come after slot-set! | |
1066 | ||
1067 | old) | |
1068 | ||
1069 | ;;; | |
1070 | ;;; remove-class-accessors! | |
1071 | ;;; | |
1072 | ||
71d540f7 | 1073 | (define-method (remove-class-accessors! (c <class>)) |
14f1d9fe MD |
1074 | (for-each (lambda (m) |
1075 | (if (is-a? m <accessor-method>) | |
58241edc MD |
1076 | (let ((gf (slot-ref m 'generic-function))) |
1077 | ;; remove the method from its GF | |
1078 | (slot-set! gf 'methods | |
1079 | (delq1! m (slot-ref gf 'methods))) | |
eddd81f4 | 1080 | (invalidate-method-cache! gf) |
58241edc MD |
1081 | ;; remove the method from its specializers |
1082 | (remove-method-in-classes! m)))) | |
14f1d9fe MD |
1083 | (class-direct-methods c))) |
1084 | ||
1085 | ;;; | |
1086 | ;;; update-direct-method! | |
1087 | ;;; | |
1088 | ||
71d540f7 | 1089 | (define-method (update-direct-method! (m <method>) |
14f1d9fe MD |
1090 | (old <class>) |
1091 | (new <class>)) | |
1092 | (let loop ((l (method-specializers m))) | |
1093 | ;; Note: the <top> in dotted list is never used. | |
1094 | ;; So we can work as if we had only proper lists. | |
1095 | (if (pair? l) | |
1096 | (begin | |
1097 | (if (eqv? (car l) old) | |
1098 | (set-car! l new)) | |
1099 | (loop (cdr l)))))) | |
1100 | ||
1101 | ;;; | |
1102 | ;;; update-direct-subclass! | |
1103 | ;;; | |
1104 | ||
71d540f7 | 1105 | (define-method (update-direct-subclass! (c <class>) |
14f1d9fe MD |
1106 | (old <class>) |
1107 | (new <class>)) | |
1108 | (class-redefinition c | |
1109 | (make-class (class-direct-supers c) | |
1110 | (class-direct-slots c) | |
1111 | #:name (class-name c) | |
14f1d9fe MD |
1112 | #:metaclass (class-of c)))) |
1113 | ||
1114 | ;;; | |
1115 | ;;; {Utilities for INITIALIZE methods} | |
1116 | ;;; | |
1117 | ||
1118 | ;;; compute-slot-accessors | |
1119 | ;;; | |
9d019f9b | 1120 | (define (compute-slot-accessors class slots) |
14f1d9fe MD |
1121 | (for-each |
1122 | (lambda (s g-n-s) | |
a2ca7252 | 1123 | (let ((getter-function (slot-definition-getter s)) |
14f1d9fe MD |
1124 | (setter-function (slot-definition-setter s)) |
1125 | (accessor (slot-definition-accessor s))) | |
1126 | (if getter-function | |
1127 | (add-method! getter-function | |
1128 | (compute-getter-method class g-n-s))) | |
1129 | (if setter-function | |
1130 | (add-method! setter-function | |
1131 | (compute-setter-method class g-n-s))) | |
1132 | (if accessor | |
1133 | (begin | |
1134 | (add-method! accessor | |
1135 | (compute-getter-method class g-n-s)) | |
1136 | (add-method! (setter accessor) | |
1137 | (compute-setter-method class g-n-s)))))) | |
1138 | slots (slot-ref class 'getters-n-setters))) | |
1139 | ||
583a23bf AW |
1140 | (define-method (compute-getter-method (class <class>) g-n-s) |
1141 | (let ((name (car g-n-s))) | |
14f1d9fe MD |
1142 | (make <accessor-method> |
1143 | #:specializers (list class) | |
583a23bf AW |
1144 | #:procedure (lambda (o) (slot-ref o name)) |
1145 | #:slot-definition g-n-s))) | |
1146 | ||
1147 | (define-method (compute-setter-method (class <class>) g-n-s) | |
1148 | (let ((name (car g-n-s))) | |
14f1d9fe | 1149 | (make <accessor-method> |
583a23bf AW |
1150 | #:specializers (list class <top>) |
1151 | #:procedure (lambda (o v) (slot-set! o name v)) | |
1152 | #:slot-definition g-n-s))) | |
14f1d9fe MD |
1153 | |
1154 | (define (make-generic-bound-check-getter proc) | |
8397a3a6 | 1155 | (lambda (o) (assert-bound (proc o) o))) |
14f1d9fe | 1156 | |
5192c9e8 | 1157 | ;; the idea is to compile the index into the procedure, for fastest |
48ad85fb | 1158 | ;; lookup. |
ac0e91c4 | 1159 | |
f6ddf827 | 1160 | (eval-when (expand load eval) |
b15dea68 | 1161 | (define num-standard-pre-cache 20)) |
abd6af11 AW |
1162 | |
1163 | (define-macro (define-standard-accessor-method form . body) | |
1164 | (let ((name (caar form)) | |
1165 | (n-var (cadar form)) | |
1166 | (args (cdr form))) | |
1167 | (define (make-one x) | |
1168 | (define (body-trans form) | |
1169 | (cond ((not (pair? form)) form) | |
48ad85fb | 1170 | ((eq? (car form) 'struct-ref) |
abd6af11 | 1171 | `(,(car form) ,(cadr form) ,x)) |
48ad85fb | 1172 | ((eq? (car form) 'struct-set!) |
abd6af11 AW |
1173 | `(,(car form) ,(cadr form) ,x ,(cadddr form))) |
1174 | (else | |
1175 | (map body-trans form)))) | |
1176 | `(lambda ,args ,@(map body-trans body))) | |
1177 | `(define ,name | |
1178 | (let ((cache (vector ,@(map make-one (iota num-standard-pre-cache))))) | |
1179 | (lambda (n) | |
1180 | (if (< n ,num-standard-pre-cache) | |
1181 | (vector-ref cache n) | |
1182 | ((lambda (,n-var) (lambda ,args ,@body)) n))))))) | |
1183 | ||
1184 | (define-standard-accessor-method ((bound-check-get n) o) | |
48ad85fb | 1185 | (let ((x (struct-ref o n))) |
abd6af11 | 1186 | (if (unbound? x) |
84012ef4 | 1187 | (slot-unbound o) |
abd6af11 AW |
1188 | x))) |
1189 | ||
1190 | (define-standard-accessor-method ((standard-get n) o) | |
48ad85fb | 1191 | (struct-ref o n)) |
abd6af11 AW |
1192 | |
1193 | (define-standard-accessor-method ((standard-set n) o v) | |
48ad85fb | 1194 | (struct-set! o n v)) |
14f1d9fe MD |
1195 | |
1196 | ;;; compute-getters-n-setters | |
05a6b2d3 | 1197 | ;;; |
9d019f9b | 1198 | (define (compute-getters-n-setters class slots) |
14f1d9fe | 1199 | |
266f3a23 MD |
1200 | (define (compute-slot-init-function name s) |
1201 | (or (let ((thunk (slot-definition-init-thunk s))) | |
1202 | (and thunk | |
314b8716 AW |
1203 | (if (thunk? thunk) |
1204 | thunk | |
1205 | (goops-error "Bad init-thunk for slot `~S' in ~S: ~S" | |
1206 | name class thunk)))) | |
14f1d9fe MD |
1207 | (let ((init (slot-definition-init-value s))) |
1208 | (and (not (unbound? init)) | |
1209 | (lambda () init))))) | |
1210 | ||
1211 | (define (verify-accessors slot l) | |
21ab2aeb MD |
1212 | (cond ((integer? l)) |
1213 | ((not (and (list? l) (= (length l) 2))) | |
1214 | (goops-error "Bad getter and setter for slot `~S' in ~S: ~S" | |
1215 | slot class l)) | |
1216 | (else | |
1217 | (let ((get (car l)) | |
1218 | (set (cadr l))) | |
314b8716 AW |
1219 | (if (not (procedure? get)) |
1220 | (goops-error "Bad getter closure for slot `~S' in ~S: ~S" | |
21ab2aeb | 1221 | slot class get)) |
314b8716 AW |
1222 | (if (not (procedure? set)) |
1223 | (goops-error "Bad setter closure for slot `~S' in ~S: ~S" | |
21ab2aeb | 1224 | slot class set)))))) |
14f1d9fe MD |
1225 | |
1226 | (map (lambda (s) | |
21ab2aeb MD |
1227 | ;; The strange treatment of nfields is due to backward compatibility. |
1228 | (let* ((index (slot-ref class 'nfields)) | |
1229 | (g-n-s (compute-get-n-set class s)) | |
1230 | (size (- (slot-ref class 'nfields) index)) | |
14f1d9fe | 1231 | (name (slot-definition-name s))) |
21ab2aeb MD |
1232 | ;; NOTE: The following is interdependent with C macros |
1233 | ;; defined above goops.c:scm_sys_prep_layout_x. | |
1234 | ;; | |
1235 | ;; For simple instance slots, we have the simplest form | |
1236 | ;; '(name init-function . index) | |
1237 | ;; For other slots we have | |
1238 | ;; '(name init-function getter setter . alloc) | |
1239 | ;; where alloc is: | |
1240 | ;; '(index size) for instance allocated slots | |
1241 | ;; '() for other slots | |
14f1d9fe | 1242 | (verify-accessors name g-n-s) |
5b763233 AW |
1243 | (case (slot-definition-allocation s) |
1244 | ((#:each-subclass #:class) | |
1245 | (unless (and (zero? size) (pair? g-n-s)) | |
1246 | (error "Class-allocated slots should not reserve fields")) | |
1247 | ;; Don't initialize the slot; that's handled when the slot | |
1248 | ;; is allocated, in compute-get-n-set. | |
1249 | (cons name (cons #f g-n-s))) | |
1250 | (else | |
1251 | (cons name | |
1252 | (cons (compute-slot-init-function name s) | |
1253 | (if (or (integer? g-n-s) | |
1254 | (zero? size)) | |
1255 | g-n-s | |
1256 | (append g-n-s (list index size))))))))) | |
14f1d9fe MD |
1257 | slots)) |
1258 | ||
1259 | ;;; compute-cpl | |
1260 | ;;; | |
1261 | ;;; Correct behaviour: | |
1262 | ;;; | |
1263 | ;;; (define-class food ()) | |
1264 | ;;; (define-class fruit (food)) | |
1265 | ;;; (define-class spice (food)) | |
1266 | ;;; (define-class apple (fruit)) | |
1267 | ;;; (define-class cinnamon (spice)) | |
1268 | ;;; (define-class pie (apple cinnamon)) | |
1269 | ;;; => cpl (pie) = pie apple fruit cinnamon spice food object top | |
1270 | ;;; | |
1271 | ;;; (define-class d ()) | |
1272 | ;;; (define-class e ()) | |
1273 | ;;; (define-class f ()) | |
1274 | ;;; (define-class b (d e)) | |
1275 | ;;; (define-class c (e f)) | |
1276 | ;;; (define-class a (b c)) | |
1277 | ;;; => cpl (a) = a b d c e f object top | |
1278 | ;;; | |
1279 | ||
71d540f7 | 1280 | (define-method (compute-cpl (class <class>)) |
14f1d9fe MD |
1281 | (compute-std-cpl class class-direct-supers)) |
1282 | ||
1283 | ;; Support | |
1284 | ||
1285 | (define (only-non-null lst) | |
1286 | (filter (lambda (l) (not (null? l))) lst)) | |
1287 | ||
1288 | (define (compute-std-cpl c get-direct-supers) | |
1289 | (let ((c-direct-supers (get-direct-supers c))) | |
1290 | (merge-lists (list c) | |
1291 | (only-non-null (append (map class-precedence-list | |
1292 | c-direct-supers) | |
1293 | (list c-direct-supers)))))) | |
1294 | ||
1295 | (define (merge-lists reversed-partial-result inputs) | |
1296 | (cond | |
1297 | ((every null? inputs) | |
1298 | (reverse! reversed-partial-result)) | |
1299 | (else | |
1300 | (let* ((candidate (lambda (c) | |
1301 | (and (not (any (lambda (l) | |
1302 | (memq c (cdr l))) | |
1303 | inputs)) | |
1304 | c))) | |
1305 | (candidate-car (lambda (l) | |
1306 | (and (not (null? l)) | |
1307 | (candidate (car l))))) | |
1308 | (next (any candidate-car inputs))) | |
1309 | (if (not next) | |
1310 | (goops-error "merge-lists: Inconsistent precedence graph")) | |
1311 | (let ((remove-next (lambda (l) | |
1312 | (if (eq? (car l) next) | |
1313 | (cdr l) | |
1314 | l)))) | |
1315 | (merge-lists (cons next reversed-partial-result) | |
1316 | (only-non-null (map remove-next inputs)))))))) | |
1317 | ||
1318 | ;; Modified from TinyClos: | |
1319 | ;; | |
1320 | ;; A simple topological sort. | |
1321 | ;; | |
1322 | ;; It's in this file so that both TinyClos and Objects can use it. | |
1323 | ;; | |
1324 | ;; This is a fairly modified version of code I originally got from Anurag | |
1325 | ;; Mendhekar <anurag@moose.cs.indiana.edu>. | |
1326 | ;; | |
1327 | ||
1328 | (define (compute-clos-cpl c get-direct-supers) | |
1329 | (top-sort ((build-transitive-closure get-direct-supers) c) | |
1330 | ((build-constraints get-direct-supers) c) | |
1331 | (std-tie-breaker get-direct-supers))) | |
1332 | ||
1333 | ||
1334 | (define (top-sort elements constraints tie-breaker) | |
1335 | (let loop ((elements elements) | |
1336 | (constraints constraints) | |
1337 | (result '())) | |
1338 | (if (null? elements) | |
1339 | result | |
1340 | (let ((can-go-in-now | |
1341 | (filter | |
1342 | (lambda (x) | |
1343 | (every (lambda (constraint) | |
1344 | (or (not (eq? (cadr constraint) x)) | |
1345 | (memq (car constraint) result))) | |
1346 | constraints)) | |
1347 | elements))) | |
1348 | (if (null? can-go-in-now) | |
1349 | (goops-error "top-sort: Invalid constraints") | |
1350 | (let ((choice (if (null? (cdr can-go-in-now)) | |
1351 | (car can-go-in-now) | |
1352 | (tie-breaker result | |
1353 | can-go-in-now)))) | |
1354 | (loop | |
1355 | (filter (lambda (x) (not (eq? x choice))) | |
b0dff018 | 1356 | elements) |
14f1d9fe MD |
1357 | constraints |
1358 | (append result (list choice))))))))) | |
1359 | ||
1360 | (define (std-tie-breaker get-supers) | |
1361 | (lambda (partial-cpl min-elts) | |
1362 | (let loop ((pcpl (reverse partial-cpl))) | |
1363 | (let ((current-elt (car pcpl))) | |
1364 | (let ((ds-of-ce (get-supers current-elt))) | |
1365 | (let ((common (filter (lambda (x) | |
1366 | (memq x ds-of-ce)) | |
1367 | min-elts))) | |
1368 | (if (null? common) | |
1369 | (if (null? (cdr pcpl)) | |
1370 | (goops-error "std-tie-breaker: Nothing valid") | |
1371 | (loop (cdr pcpl))) | |
1372 | (car common)))))))) | |
1373 | ||
1374 | ||
1375 | (define (build-transitive-closure get-follow-ons) | |
1376 | (lambda (x) | |
1377 | (let track ((result '()) | |
1378 | (pending (list x))) | |
1379 | (if (null? pending) | |
1380 | result | |
1381 | (let ((next (car pending))) | |
1382 | (if (memq next result) | |
1383 | (track result (cdr pending)) | |
1384 | (track (cons next result) | |
1385 | (append (get-follow-ons next) | |
1386 | (cdr pending))))))))) | |
1387 | ||
1388 | (define (build-constraints get-follow-ons) | |
1389 | (lambda (x) | |
1390 | (let loop ((elements ((build-transitive-closure get-follow-ons) x)) | |
1391 | (this-one '()) | |
1392 | (result '())) | |
1393 | (if (or (null? this-one) (null? (cdr this-one))) | |
1394 | (if (null? elements) | |
1395 | result | |
1396 | (loop (cdr elements) | |
1397 | (cons (car elements) | |
1398 | (get-follow-ons (car elements))) | |
1399 | result)) | |
1400 | (loop elements | |
1401 | (cdr this-one) | |
1402 | (cons (list (car this-one) (cadr this-one)) | |
1403 | result)))))) | |
1404 | ||
1405 | ;;; compute-get-n-set | |
1406 | ;;; | |
71d540f7 | 1407 | (define-method (compute-get-n-set (class <class>) s) |
5b763233 AW |
1408 | (define (class-slot-init-value) |
1409 | (let ((thunk (slot-definition-init-thunk s))) | |
1410 | (if thunk | |
1411 | (thunk) | |
1412 | (slot-definition-init-value s)))) | |
1413 | ||
14f1d9fe MD |
1414 | (case (slot-definition-allocation s) |
1415 | ((#:instance) ;; Instance slot | |
1416 | ;; get-n-set is just its offset | |
1417 | (let ((already-allocated (slot-ref class 'nfields))) | |
1418 | (slot-set! class 'nfields (+ already-allocated 1)) | |
1419 | already-allocated)) | |
1420 | ||
1421 | ((#:class) ;; Class slot | |
1422 | ;; Class-slots accessors are implemented as 2 closures around | |
1423 | ;; a Scheme variable. As instance slots, class slots must be | |
1424 | ;; unbound at init time. | |
1425 | (let ((name (slot-definition-name s))) | |
1426 | (if (memq name (map slot-definition-name (class-direct-slots class))) | |
1427 | ;; This slot is direct; create a new shared variable | |
5b763233 | 1428 | (make-closure-variable class (class-slot-init-value)) |
14f1d9fe MD |
1429 | ;; Slot is inherited. Find its definition in superclass |
1430 | (let loop ((l (cdr (class-precedence-list class)))) | |
1431 | (let ((r (assoc name (slot-ref (car l) 'getters-n-setters)))) | |
1432 | (if r | |
1433 | (cddr r) | |
1434 | (loop (cdr l)))))))) | |
1435 | ||
1436 | ((#:each-subclass) ;; slot shared by instances of direct subclass. | |
1437 | ;; (Thomas Buerger, April 1998) | |
5b763233 | 1438 | (make-closure-variable class (class-slot-init-value))) |
14f1d9fe MD |
1439 | |
1440 | ((#:virtual) ;; No allocation | |
1441 | ;; slot-ref and slot-set! function must be given by the user | |
1442 | (let ((get (get-keyword #:slot-ref (slot-definition-options s) #f)) | |
a2ca7252 | 1443 | (set (get-keyword #:slot-set! (slot-definition-options s) #f))) |
14f1d9fe | 1444 | (if (not (and get set)) |
3a43b605 | 1445 | (goops-error "You must supply a #:slot-ref and a #:slot-set! in ~S" |
14f1d9fe MD |
1446 | s)) |
1447 | (list get set))) | |
1448 | (else (next-method)))) | |
1449 | ||
5b763233 AW |
1450 | (define (make-closure-variable class value) |
1451 | (list (lambda (o) value) | |
1452 | (lambda (o v) (set! value v)))) | |
14f1d9fe | 1453 | |
71d540f7 | 1454 | (define-method (compute-get-n-set (o <object>) s) |
14f1d9fe MD |
1455 | (goops-error "Allocation \"~S\" is unknown" (slot-definition-allocation s))) |
1456 | ||
71d540f7 | 1457 | (define-method (compute-slots (class <class>)) |
14f1d9fe MD |
1458 | (%compute-slots class)) |
1459 | ||
1460 | ;;; | |
1461 | ;;; {Initialize} | |
1462 | ;;; | |
1463 | ||
71d540f7 | 1464 | (define-method (initialize (object <object>) initargs) |
14f1d9fe MD |
1465 | (%initialize-object object initargs)) |
1466 | ||
71d540f7 | 1467 | (define-method (initialize (class <class>) initargs) |
14f1d9fe MD |
1468 | (next-method) |
1469 | (let ((dslots (get-keyword #:slots initargs '())) | |
9d019f9b | 1470 | (supers (get-keyword #:dsupers initargs '()))) |
14f1d9fe MD |
1471 | (slot-set! class 'name (get-keyword #:name initargs '???)) |
1472 | (slot-set! class 'direct-supers supers) | |
1473 | (slot-set! class 'direct-slots dslots) | |
1474 | (slot-set! class 'direct-subclasses '()) | |
1475 | (slot-set! class 'direct-methods '()) | |
1476 | (slot-set! class 'cpl (compute-cpl class)) | |
1477 | (slot-set! class 'redefined #f) | |
14f1d9fe MD |
1478 | (let ((slots (compute-slots class))) |
1479 | (slot-set! class 'slots slots) | |
1480 | (slot-set! class 'nfields 0) | |
1481 | (slot-set! class 'getters-n-setters (compute-getters-n-setters class | |
9d019f9b | 1482 | slots)) |
14f1d9fe | 1483 | ;; Build getters - setters - accessors |
9d019f9b | 1484 | (compute-slot-accessors class slots)) |
14f1d9fe MD |
1485 | |
1486 | ;; Update the "direct-subclasses" of each inherited classes | |
1487 | (for-each (lambda (x) | |
1488 | (slot-set! x | |
1489 | 'direct-subclasses | |
1490 | (cons class (slot-ref x 'direct-subclasses)))) | |
1491 | supers) | |
1492 | ||
1493 | ;; Support for the underlying structs: | |
1494 | ||
14f1d9fe | 1495 | ;; Set the layout slot |
51f66c91 AW |
1496 | (%prep-layout! class) |
1497 | ;; Inherit class flags (invisible on scheme level) from supers | |
1498 | (%inherit-magic! class supers))) | |
14f1d9fe | 1499 | |
14f1d9fe MD |
1500 | (define (initialize-object-procedure object initargs) |
1501 | (let ((proc (get-keyword #:procedure initargs #f))) | |
1502 | (cond ((not proc)) | |
1503 | ((pair? proc) | |
962b9103 | 1504 | (apply slot-set! object 'procedure proc)) |
14f1d9fe | 1505 | (else |
962b9103 | 1506 | (slot-set! object 'procedure proc))))) |
14f1d9fe | 1507 | |
51f66c91 | 1508 | (define-method (initialize (applicable-struct <applicable-struct>) initargs) |
14f1d9fe | 1509 | (next-method) |
51f66c91 | 1510 | (initialize-object-procedure applicable-struct initargs)) |
14f1d9fe | 1511 | |
71d540f7 | 1512 | (define-method (initialize (generic <generic>) initargs) |
14f1d9fe MD |
1513 | (let ((previous-definition (get-keyword #:default initargs #f)) |
1514 | (name (get-keyword #:name initargs #f))) | |
1515 | (next-method) | |
1516 | (slot-set! generic 'methods (if (is-a? previous-definition <procedure>) | |
7d38f3d8 AW |
1517 | (list (method args |
1518 | (apply previous-definition args))) | |
14f1d9fe MD |
1519 | '())) |
1520 | (if name | |
1521 | (set-procedure-property! generic 'name name)) | |
1522 | )) | |
1523 | ||
51f66c91 AW |
1524 | (define-method (initialize (gws <generic-with-setter>) initargs) |
1525 | (next-method) | |
1526 | (%set-object-setter! gws (get-keyword #:setter initargs #f))) | |
1527 | ||
bbf8d523 MD |
1528 | (define-method (initialize (eg <extended-generic>) initargs) |
1529 | (next-method) | |
1530 | (slot-set! eg 'extends (get-keyword #:extends initargs '()))) | |
1531 | ||
b432fb4b MD |
1532 | (define dummy-procedure (lambda args *unspecified*)) |
1533 | ||
71d540f7 | 1534 | (define-method (initialize (method <method>) initargs) |
14f1d9fe MD |
1535 | (next-method) |
1536 | (slot-set! method 'generic-function (get-keyword #:generic-function initargs #f)) | |
1537 | (slot-set! method 'specializers (get-keyword #:specializers initargs '())) | |
b432fb4b | 1538 | (slot-set! method 'procedure |
e177058b | 1539 | (get-keyword #:procedure initargs #f)) |
21497600 AW |
1540 | (slot-set! method 'formals (get-keyword #:formals initargs '())) |
1541 | (slot-set! method 'body (get-keyword #:body initargs '())) | |
e177058b | 1542 | (slot-set! method 'make-procedure (get-keyword #:make-procedure initargs #f))) |
21497600 | 1543 | |
14f1d9fe | 1544 | |
14f1d9fe MD |
1545 | ;;; |
1546 | ;;; {Change-class} | |
1547 | ;;; | |
1548 | ||
1549 | (define (change-object-class old-instance old-class new-class) | |
cc6c7fee | 1550 | (let ((new-instance (allocate-instance new-class '()))) |
8378b269 | 1551 | ;; Initialize the slots of the new instance |
14f1d9fe MD |
1552 | (for-each (lambda (slot) |
1553 | (if (and (slot-exists-using-class? old-class old-instance slot) | |
1554 | (eq? (slot-definition-allocation | |
1555 | (class-slot-definition old-class slot)) | |
1556 | #:instance) | |
1557 | (slot-bound-using-class? old-class old-instance slot)) | |
1558 | ;; Slot was present and allocated in old instance; copy it | |
1559 | (slot-set-using-class! | |
1560 | new-class | |
1561 | new-instance | |
1562 | slot | |
1563 | (slot-ref-using-class old-class old-instance slot)) | |
1564 | ;; slot was absent; initialize it with its default value | |
1565 | (let ((init (slot-init-function new-class slot))) | |
1566 | (if init | |
1567 | (slot-set-using-class! | |
1568 | new-class | |
1569 | new-instance | |
1570 | slot | |
1571 | (apply init '())))))) | |
1572 | (map slot-definition-name (class-slots new-class))) | |
1573 | ;; Exchange old and new instance in place to keep pointers valid | |
1574 | (%modify-instance old-instance new-instance) | |
1575 | ;; Allow class specific updates of instances (which now are swapped) | |
1576 | (update-instance-for-different-class new-instance old-instance) | |
1577 | old-instance)) | |
1578 | ||
1579 | ||
71d540f7 | 1580 | (define-method (update-instance-for-different-class (old-instance <object>) |
14f1d9fe MD |
1581 | (new-instance |
1582 | <object>)) | |
1583 | ;;not really important what we do, we just need a default method | |
1584 | new-instance) | |
1585 | ||
71d540f7 | 1586 | (define-method (change-class (old-instance <object>) (new-class <class>)) |
14f1d9fe MD |
1587 | (change-object-class old-instance (class-of old-instance) new-class)) |
1588 | ||
1589 | ;;; | |
1590 | ;;; {make} | |
1591 | ;;; | |
1592 | ;;; A new definition which overwrites the previous one which was built-in | |
1593 | ;;; | |
1594 | ||
71d540f7 | 1595 | (define-method (allocate-instance (class <class>) initargs) |
14f1d9fe MD |
1596 | (%allocate-instance class initargs)) |
1597 | ||
71d540f7 | 1598 | (define-method (make-instance (class <class>) . initargs) |
14f1d9fe MD |
1599 | (let ((instance (allocate-instance class initargs))) |
1600 | (initialize instance initargs) | |
1601 | instance)) | |
1602 | ||
1603 | (define make make-instance) | |
1604 | ||
1605 | ;;; | |
1606 | ;;; {apply-generic} | |
1607 | ;;; | |
1608 | ;;; Protocol for calling standard generic functions. This protocol is | |
1609 | ;;; not used for real <generic> functions (in this case we use a | |
1610 | ;;; completely C hard-coded protocol). Apply-generic is used by | |
1611 | ;;; goops for calls to subclasses of <generic> and <generic-with-setter>. | |
1612 | ;;; The code below is similar to the first MOP described in AMOP. In | |
1613 | ;;; particular, it doesn't used the currified approach to gf | |
1614 | ;;; call. There are 2 reasons for that: | |
1615 | ;;; - the protocol below is exposed to mimic completely the one written in C | |
1616 | ;;; - the currified protocol would be imho inefficient in C. | |
1617 | ;;; | |
1618 | ||
71d540f7 | 1619 | (define-method (apply-generic (gf <generic>) args) |
14f1d9fe MD |
1620 | (if (null? (slot-ref gf 'methods)) |
1621 | (no-method gf args)) | |
1622 | (let ((methods (compute-applicable-methods gf args))) | |
1623 | (if methods | |
1624 | (apply-methods gf (sort-applicable-methods gf methods args) args) | |
1625 | (no-applicable-method gf args)))) | |
1626 | ||
1627 | ;; compute-applicable-methods is bound to %compute-applicable-methods. | |
1628 | ;; *fixme* use let | |
1629 | (define %%compute-applicable-methods | |
1630 | (make <generic> #:name 'compute-applicable-methods)) | |
1631 | ||
71d540f7 | 1632 | (define-method (%%compute-applicable-methods (gf <generic>) args) |
14f1d9fe MD |
1633 | (%compute-applicable-methods gf args)) |
1634 | ||
1635 | (set! compute-applicable-methods %%compute-applicable-methods) | |
1636 | ||
71d540f7 | 1637 | (define-method (sort-applicable-methods (gf <generic>) methods args) |
14f1d9fe MD |
1638 | (let ((targs (map class-of args))) |
1639 | (sort methods (lambda (m1 m2) (method-more-specific? m1 m2 targs))))) | |
1640 | ||
71d540f7 | 1641 | (define-method (method-more-specific? (m1 <method>) (m2 <method>) targs) |
14f1d9fe MD |
1642 | (%method-more-specific? m1 m2 targs)) |
1643 | ||
71d540f7 | 1644 | (define-method (apply-method (gf <generic>) methods build-next args) |
14f1d9fe MD |
1645 | (apply (method-procedure (car methods)) |
1646 | (build-next (cdr methods) args) | |
1647 | args)) | |
1648 | ||
71d540f7 | 1649 | (define-method (apply-methods (gf <generic>) (l <list>) args) |
14f1d9fe MD |
1650 | (letrec ((next (lambda (procs args) |
1651 | (lambda new-args | |
1652 | (let ((a (if (null? new-args) args new-args))) | |
1653 | (if (null? procs) | |
1654 | (no-next-method gf a) | |
1655 | (apply-method gf procs next a))))))) | |
1656 | (apply-method gf l next args))) | |
1657 | ||
1658 | ;; We don't want the following procedure to turn up in backtraces: | |
1659 | (for-each (lambda (proc) | |
1660 | (set-procedure-property! proc 'system-procedure #t)) | |
1661 | (list slot-unbound | |
1662 | slot-missing | |
1663 | no-next-method | |
1664 | no-applicable-method | |
1665 | no-method | |
1666 | )) | |
1667 | ||
1668 | ;;; | |
1669 | ;;; {<composite-metaclass> and <active-metaclass>} | |
1670 | ;;; | |
1671 | ||
1672 | ;(autoload "active-slot" <active-metaclass>) | |
1673 | ;(autoload "composite-slot" <composite-metaclass>) | |
1674 | ;(export <composite-metaclass> <active-metaclass>) | |
1675 | ||
1676 | ;;; | |
1677 | ;;; {Tools} | |
1678 | ;;; | |
1679 | ||
1680 | ;; list2set | |
1681 | ;; | |
1682 | ;; duplicate the standard list->set function but using eq instead of | |
1683 | ;; eqv which really sucks a lot, uselessly here | |
1684 | ;; | |
1685 | (define (list2set l) | |
1686 | (let loop ((l l) | |
1687 | (res '())) | |
1688 | (cond | |
1689 | ((null? l) res) | |
1690 | ((memq (car l) res) (loop (cdr l) res)) | |
1691 | (else (loop (cdr l) (cons (car l) res)))))) | |
1692 | ||
1693 | (define (class-subclasses c) | |
1694 | (letrec ((allsubs (lambda (c) | |
1695 | (cons c (mapappend allsubs | |
1696 | (class-direct-subclasses c)))))) | |
1697 | (list2set (cdr (allsubs c))))) | |
1698 | ||
1699 | (define (class-methods c) | |
1700 | (list2set (mapappend class-direct-methods | |
1701 | (cons c (class-subclasses c))))) | |
1702 | ||
1703 | ;;; | |
1704 | ;;; {Final initialization} | |
1705 | ;;; | |
1706 | ||
1707 | ;; Tell C code that the main bulk of Goops has been loaded | |
1708 | (%goops-loaded) |