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14f1d9fe MD |
1 | ;;; installed-scm-file |
2 | ||
0dd8493c | 3 | ;;;; Copyright (C) 1998,1999,2000,2001,2002, 2003, 2006, 2009, 2010, 2011 Free Software Foundation, Inc. |
14f1d9fe | 4 | ;;;; |
73be1d9e MV |
5 | ;;;; This library is free software; you can redistribute it and/or |
6 | ;;;; modify it under the terms of the GNU Lesser General Public | |
7 | ;;;; License as published by the Free Software Foundation; either | |
53befeb7 | 8 | ;;;; version 3 of the License, or (at your option) any later version. |
14f1d9fe | 9 | ;;;; |
73be1d9e | 10 | ;;;; This library is distributed in the hope that it will be useful, |
14f1d9fe | 11 | ;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of |
73be1d9e MV |
12 | ;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | ;;;; Lesser General Public License for more details. | |
14f1d9fe | 14 | ;;;; |
73be1d9e MV |
15 | ;;;; You should have received a copy of the GNU Lesser General Public |
16 | ;;;; License along with this library; if not, write to the Free Software | |
92205699 | 17 | ;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
14f1d9fe MD |
18 | ;;;; |
19 | \f | |
20 | ||
21 | ;;;; This software is a derivative work of other copyrighted softwares; the | |
22 | ;;;; copyright notices of these softwares are placed in the file COPYRIGHTS | |
23 | ;;;; | |
24 | ;;;; This file is based upon stklos.stk from the STk distribution by | |
25 | ;;;; Erick Gallesio <eg@unice.fr>. | |
26 | ;;;; | |
27 | ||
28 | (define-module (oop goops) | |
d31c5d19 | 29 | :use-module (srfi srfi-1) |
f12de0a1 | 30 | :export-syntax (define-class class standard-define-class |
1a179b03 | 31 | define-generic define-accessor define-method |
f595ccfe | 32 | define-extended-generic define-extended-generics |
1a179b03 | 33 | method) |
3dc071e4 | 34 | :export (is-a? class-of |
1a179b03 MD |
35 | ensure-metaclass ensure-metaclass-with-supers |
36 | make-class | |
37 | make-generic ensure-generic | |
bbf8d523 | 38 | make-extended-generic |
1a179b03 | 39 | make-accessor ensure-accessor |
e177058b | 40 | add-method! |
1a179b03 MD |
41 | class-slot-ref class-slot-set! slot-unbound slot-missing |
42 | slot-definition-name slot-definition-options | |
43 | slot-definition-allocation | |
44 | slot-definition-getter slot-definition-setter | |
45 | slot-definition-accessor | |
46 | slot-definition-init-value slot-definition-init-form | |
47 | slot-definition-init-thunk slot-definition-init-keyword | |
48 | slot-init-function class-slot-definition | |
49 | method-source | |
50 | compute-cpl compute-std-cpl compute-get-n-set compute-slots | |
51 | compute-getter-method compute-setter-method | |
52 | allocate-instance initialize make-instance make | |
53 | no-next-method no-applicable-method no-method | |
54 | change-class update-instance-for-different-class | |
55 | shallow-clone deep-clone | |
56 | class-redefinition | |
57 | apply-generic apply-method apply-methods | |
58 | compute-applicable-methods %compute-applicable-methods | |
59 | method-more-specific? sort-applicable-methods | |
60 | class-subclasses class-methods | |
61 | goops-error | |
62 | min-fixnum max-fixnum | |
63 | ;;; *fixme* Should go into goops.c | |
64 | instance? slot-ref-using-class | |
65 | slot-set-using-class! slot-bound-using-class? | |
66 | slot-exists-using-class? slot-ref slot-set! slot-bound? | |
67 | class-name class-direct-supers class-direct-subclasses | |
68 | class-direct-methods class-direct-slots class-precedence-list | |
9d019f9b | 69 | class-slots |
1a179b03 | 70 | generic-function-name |
4e2f1e9e AW |
71 | generic-function-methods method-generic-function |
72 | method-specializers method-formals | |
1a179b03 MD |
73 | primitive-generic-generic enable-primitive-generic! |
74 | method-procedure accessor-method-slot-definition | |
75 | slot-exists? make find-method get-keyword) | |
78ec533c MV |
76 | :no-backtrace) |
77 | ||
ac0e91c4 AW |
78 | (define *goops-module* (current-module)) |
79 | ||
78ec533c | 80 | ;; First initialize the builtin part of GOOPS |
b15dea68 AW |
81 | (eval-when (eval load compile) |
82 | (%init-goops-builtins)) | |
78ec533c | 83 | |
aec4a84a AW |
84 | (eval-when (eval load compile) |
85 | (use-modules ((language tree-il primitives) :select (add-interesting-primitive!))) | |
86 | (add-interesting-primitive! 'class-of) | |
83c76550 AW |
87 | (define (@slot-ref o n) |
88 | (struct-ref o n)) | |
89 | (define (@slot-set! o n v) | |
90 | (struct-set! o n v)) | |
aec4a84a AW |
91 | (add-interesting-primitive! '@slot-ref) |
92 | (add-interesting-primitive! '@slot-set!)) | |
93 | ||
78ec533c MV |
94 | ;; Then load the rest of GOOPS |
95 | (use-modules (oop goops util) | |
96 | (oop goops dispatch) | |
51f7ef47 | 97 | (oop goops compile)) |
14f1d9fe | 98 | |
14f1d9fe | 99 | \f |
b15dea68 | 100 | (eval-when (eval load compile) |
abd6af11 | 101 | (define min-fixnum (- (expt 2 29))) |
b15dea68 | 102 | (define max-fixnum (- (expt 2 29) 1))) |
14f1d9fe MD |
103 | |
104 | ;; | |
105 | ;; goops-error | |
106 | ;; | |
107 | (define (goops-error format-string . args) | |
14f1d9fe MD |
108 | (scm-error 'goops-error #f format-string args '())) |
109 | ||
110 | ;; | |
111 | ;; is-a? | |
112 | ;; | |
113 | (define (is-a? obj class) | |
114 | (and (memq class (class-precedence-list (class-of obj))) #t)) | |
115 | ||
116 | ||
117 | ;;; | |
118 | ;;; {Meta classes} | |
119 | ;;; | |
120 | ||
121 | (define ensure-metaclass-with-supers | |
122 | (let ((table-of-metas '())) | |
123 | (lambda (meta-supers) | |
124 | (let ((entry (assoc meta-supers table-of-metas))) | |
125 | (if entry | |
126 | ;; Found a previously created metaclass | |
127 | (cdr entry) | |
128 | ;; Create a new meta-class which inherit from "meta-supers" | |
129 | (let ((new (make <class> #:dsupers meta-supers | |
130 | #:slots '() | |
131 | #:name (gensym "metaclass")))) | |
132 | (set! table-of-metas (cons (cons meta-supers new) table-of-metas)) | |
133 | new)))))) | |
134 | ||
9d019f9b | 135 | (define (ensure-metaclass supers) |
14f1d9fe MD |
136 | (if (null? supers) |
137 | <class> | |
138 | (let* ((all-metas (map (lambda (x) (class-of x)) supers)) | |
af35fc20 AW |
139 | (all-cpls (append-map (lambda (m) |
140 | (cdr (class-precedence-list m))) | |
141 | all-metas)) | |
14f1d9fe MD |
142 | (needed-metas '())) |
143 | ;; Find the most specific metaclasses. The new metaclass will be | |
144 | ;; a subclass of these. | |
145 | (for-each | |
146 | (lambda (meta) | |
147 | (if (and (not (member meta all-cpls)) | |
148 | (not (member meta needed-metas))) | |
149 | (set! needed-metas (append needed-metas (list meta))))) | |
150 | all-metas) | |
151 | ;; Now return a subclass of the metaclasses we found. | |
152 | (if (null? (cdr needed-metas)) | |
153 | (car needed-metas) ; If there's only one, just use it. | |
154 | (ensure-metaclass-with-supers needed-metas))))) | |
155 | ||
156 | ;;; | |
157 | ;;; {Classes} | |
158 | ;;; | |
159 | ||
160 | ;;; (define-class NAME (SUPER ...) SLOT-DEFINITION ... OPTION ...) | |
161 | ;;; | |
162 | ;;; SLOT-DEFINITION ::= SLOT-NAME | (SLOT-NAME OPTION ...) | |
163 | ;;; OPTION ::= KEYWORD VALUE | |
164 | ;;; | |
14f1d9fe | 165 | |
d31c5d19 AW |
166 | (define (kw-do-map mapper f kwargs) |
167 | (define (keywords l) | |
168 | (cond | |
169 | ((null? l) '()) | |
170 | ((or (null? (cdr l)) (not (keyword? (car l)))) | |
171 | (goops-error "malformed keyword arguments: ~a" kwargs)) | |
172 | (else (cons (car l) (keywords (cddr l)))))) | |
173 | (define (args l) | |
174 | (if (null? l) '() (cons (cadr l) (args (cddr l))))) | |
175 | ;; let* to check keywords first | |
176 | (let* ((k (keywords kwargs)) | |
177 | (a (args kwargs))) | |
178 | (mapper f k a))) | |
c31142ee | 179 | |
b3501b80 | 180 | (define (make-class supers slots . options) |
9d019f9b AW |
181 | (let* ((name (get-keyword #:name options (make-unbound))) |
182 | (supers (if (not (or-map (lambda (class) | |
183 | (memq <object> | |
184 | (class-precedence-list class))) | |
185 | supers)) | |
186 | (append supers (list <object>)) | |
187 | supers)) | |
188 | (metaclass (or (get-keyword #:metaclass options #f) | |
189 | (ensure-metaclass supers)))) | |
190 | ||
191 | ;; Verify that all direct slots are different and that we don't inherit | |
192 | ;; several time from the same class | |
193 | (let ((tmp1 (find-duplicate supers)) | |
194 | (tmp2 (find-duplicate (map slot-definition-name slots)))) | |
195 | (if tmp1 | |
196 | (goops-error "make-class: super class ~S is duplicate in class ~S" | |
197 | tmp1 name)) | |
198 | (if tmp2 | |
199 | (goops-error "make-class: slot ~S is duplicate in class ~S" | |
200 | tmp2 name))) | |
201 | ||
202 | ;; Everything seems correct, build the class | |
203 | (apply make metaclass | |
204 | #:dsupers supers | |
205 | #:slots slots | |
206 | #:name name | |
207 | options))) | |
14f1d9fe MD |
208 | |
209 | ;;; (class (SUPER ...) SLOT-DEFINITION ... OPTION ...) | |
210 | ;;; | |
211 | ;;; SLOT-DEFINITION ::= SLOT-NAME | (SLOT-NAME OPTION ...) | |
212 | ;;; OPTION ::= KEYWORD VALUE | |
213 | ;;; | |
d31c5d19 AW |
214 | (define-macro (class supers . slots) |
215 | (define (make-slot-definition-forms slots) | |
216 | (map | |
217 | (lambda (def) | |
218 | (cond | |
219 | ((pair? def) | |
220 | `(list ',(car def) | |
221 | ,@(kw-do-map append-map | |
222 | (lambda (kw arg) | |
223 | (case kw | |
224 | ((#:init-form) | |
225 | `(#:init-form ',arg | |
226 | #:init-thunk (lambda () ,arg))) | |
227 | (else (list kw arg)))) | |
228 | (cdr def)))) | |
229 | (else | |
230 | `(list ',def)))) | |
231 | slots)) | |
d31c5d19 AW |
232 | (if (not (list? supers)) |
233 | (goops-error "malformed superclass list: ~S" supers)) | |
a2ca7252 | 234 | (let ((slots (take-while (lambda (x) (not (keyword? x))) slots)) |
d31c5d19 AW |
235 | (options (or (find-tail keyword? slots) '()))) |
236 | `(make-class | |
237 | ;; evaluate super class variables | |
238 | (list ,@supers) | |
239 | ;; evaluate slot definitions, except the slot name! | |
240 | (list ,@(make-slot-definition-forms slots)) | |
241 | ;; evaluate class options | |
242 | ,@options))) | |
14f1d9fe | 243 | |
b3501b80 AW |
244 | (define-syntax define-class-pre-definition |
245 | (lambda (x) | |
246 | (syntax-case x () | |
247 | ((_ (k arg rest ...) out ...) | |
0dd8493c AW |
248 | (keyword? (syntax->datum #'k)) |
249 | (case (syntax->datum #'k) | |
b3501b80 | 250 | ((#:getter #:setter) |
0dd8493c AW |
251 | #'(define-class-pre-definition (rest ...) |
252 | out ... | |
253 | (if (or (not (defined? 'arg)) | |
254 | (not (is-a? arg <generic>))) | |
255 | (toplevel-define! | |
256 | 'arg | |
257 | (ensure-generic (if (defined? 'arg) arg #f) 'arg))))) | |
b3501b80 | 258 | ((#:accessor) |
0dd8493c AW |
259 | #'(define-class-pre-definition (rest ...) |
260 | out ... | |
261 | (if (or (not (defined? 'arg)) | |
262 | (not (is-a? arg <accessor>))) | |
263 | (toplevel-define! | |
264 | 'arg | |
265 | (ensure-accessor (if (defined? 'arg) arg #f) 'arg))))) | |
b3501b80 | 266 | (else |
0dd8493c | 267 | #'(define-class-pre-definition (rest ...) out ...)))) |
b3501b80 | 268 | ((_ () out ...) |
0dd8493c | 269 | #'(begin out ...))))) |
b3501b80 AW |
270 | |
271 | ;; Some slot options require extra definitions to be made. In | |
272 | ;; particular, we want to make sure that the generic function objects | |
273 | ;; which represent accessors exist before `make-class' tries to add | |
274 | ;; methods to them. | |
275 | (define-syntax define-class-pre-definitions | |
276 | (lambda (x) | |
277 | (syntax-case x () | |
278 | ((_ () out ...) | |
0dd8493c | 279 | #'(begin out ...)) |
b3501b80 | 280 | ((_ (slot rest ...) out ...) |
0dd8493c AW |
281 | (keyword? (syntax->datum #'slot)) |
282 | #'(begin out ...)) | |
b3501b80 | 283 | ((_ (slot rest ...) out ...) |
0dd8493c AW |
284 | (identifier? #'slot) |
285 | #'(define-class-pre-definitions (rest ...) | |
286 | out ...)) | |
b3501b80 | 287 | ((_ ((slotname slotopt ...) rest ...) out ...) |
0dd8493c AW |
288 | #'(define-class-pre-definitions (rest ...) |
289 | out ... (define-class-pre-definition (slotopt ...))))))) | |
b3501b80 | 290 | |
0c65f52c AW |
291 | (define-syntax-rule (define-class name supers slot ...) |
292 | (begin | |
293 | (define-class-pre-definitions (slot ...)) | |
294 | (if (and (defined? 'name) | |
295 | (is-a? name <class>) | |
296 | (memq <object> (class-precedence-list name))) | |
297 | (class-redefinition name | |
298 | (class supers slot ... #:name 'name)) | |
299 | (toplevel-define! 'name (class supers slot ... #:name 'name))))) | |
b3501b80 | 300 | |
0c65f52c AW |
301 | (define-syntax-rule (standard-define-class arg ...) |
302 | (define-class arg ...)) | |
14f1d9fe MD |
303 | |
304 | ;;; | |
305 | ;;; {Generic functions and accessors} | |
306 | ;;; | |
307 | ||
1d83f47e AW |
308 | ;; Apparently the desired semantics are that we extend previous |
309 | ;; procedural definitions, but that if `name' was already a generic, we | |
310 | ;; overwrite its definition. | |
311 | (define-macro (define-generic name) | |
312 | (if (not (symbol? name)) | |
313 | (goops-error "bad generic function name: ~S" name)) | |
314 | `(define ,name | |
315 | (if (and (defined? ',name) (is-a? ,name <generic>)) | |
316 | (make <generic> #:name ',name) | |
317 | (ensure-generic (if (defined? ',name) ,name #f) ',name)))) | |
318 | ||
319 | (define-macro (define-extended-generic name val) | |
320 | (if (not (symbol? name)) | |
321 | (goops-error "bad generic function name: ~S" name)) | |
322 | `(define ,name (make-extended-generic ,val ',name))) | |
323 | ||
324 | (define-macro (define-extended-generics names . args) | |
325 | (let ((prefixes (get-keyword #:prefix args #f))) | |
326 | (if prefixes | |
327 | `(begin | |
328 | ,@(map (lambda (name) | |
329 | `(define-extended-generic ,name | |
330 | (list ,@(map (lambda (prefix) | |
331 | (symbol-append prefix name)) | |
332 | prefixes)))) | |
333 | names)) | |
334 | (goops-error "no prefixes supplied")))) | |
bbf8d523 | 335 | |
a8c10aa1 AW |
336 | (define* (make-generic #:optional name) |
337 | (make <generic> #:name name)) | |
14f1d9fe | 338 | |
a8c10aa1 AW |
339 | (define* (make-extended-generic gfs #:optional name) |
340 | (let* ((gfs (if (list? gfs) gfs (list gfs))) | |
bbf8d523 MD |
341 | (gws? (any (lambda (gf) (is-a? gf <generic-with-setter>)) gfs))) |
342 | (let ((ans (if gws? | |
343 | (let* ((sname (and name (make-setter-name name))) | |
344 | (setters | |
af35fc20 | 345 | (append-map (lambda (gf) |
bbf8d523 MD |
346 | (if (is-a? gf <generic-with-setter>) |
347 | (list (ensure-generic (setter gf) | |
348 | sname)) | |
349 | '())) | |
af35fc20 | 350 | gfs)) |
bbf8d523 MD |
351 | (es (make <extended-generic-with-setter> |
352 | #:name name | |
353 | #:extends gfs | |
354 | #:setter (make <extended-generic> | |
355 | #:name sname | |
356 | #:extends setters)))) | |
357 | (extended-by! setters (setter es)) | |
358 | es) | |
359 | (make <extended-generic> | |
360 | #:name name | |
361 | #:extends gfs)))) | |
362 | (extended-by! gfs ans) | |
363 | ans))) | |
364 | ||
365 | (define (extended-by! gfs eg) | |
366 | (for-each (lambda (gf) | |
367 | (slot-set! gf 'extended-by | |
368 | (cons eg (slot-ref gf 'extended-by)))) | |
369 | gfs)) | |
370 | ||
371 | (define (not-extended-by! gfs eg) | |
372 | (for-each (lambda (gf) | |
373 | (slot-set! gf 'extended-by | |
374 | (delq! eg (slot-ref gf 'extended-by)))) | |
375 | gfs)) | |
376 | ||
a8c10aa1 AW |
377 | (define* (ensure-generic old-definition #:optional name) |
378 | (cond ((is-a? old-definition <generic>) old-definition) | |
379 | ((procedure-with-setter? old-definition) | |
380 | (make <generic-with-setter> | |
381 | #:name name | |
382 | #:default (procedure old-definition) | |
383 | #:setter (setter old-definition))) | |
384 | ((procedure? old-definition) | |
385 | (if (generic-capability? old-definition) old-definition | |
386 | (make <generic> #:name name #:default old-definition))) | |
387 | (else (make <generic> #:name name)))) | |
14f1d9fe | 388 | |
1d83f47e | 389 | ;; same semantics as <generic> |
0c65f52c AW |
390 | (define-syntax-rule (define-accessor name) |
391 | (define name | |
392 | (cond ((not (defined? 'name)) (ensure-accessor #f 'name)) | |
393 | ((is-a? name <accessor>) (make <accessor> #:name 'name)) | |
394 | (else (ensure-accessor name 'name))))) | |
c31142ee | 395 | |
14f1d9fe MD |
396 | (define (make-setter-name name) |
397 | (string->symbol (string-append "setter:" (symbol->string name)))) | |
398 | ||
a8c10aa1 AW |
399 | (define* (make-accessor #:optional name) |
400 | (make <accessor> | |
401 | #:name name | |
402 | #:setter (make <generic> | |
403 | #:name (and name (make-setter-name name))))) | |
404 | ||
405 | (define* (ensure-accessor proc #:optional name) | |
406 | (cond ((and (is-a? proc <accessor>) | |
407 | (is-a? (setter proc) <generic>)) | |
408 | proc) | |
409 | ((is-a? proc <generic-with-setter>) | |
410 | (upgrade-accessor proc (setter proc))) | |
411 | ((is-a? proc <generic>) | |
412 | (upgrade-accessor proc (make-generic name))) | |
413 | ((procedure-with-setter? proc) | |
414 | (make <accessor> | |
415 | #:name name | |
416 | #:default (procedure proc) | |
417 | #:setter (ensure-generic (setter proc) name))) | |
418 | ((procedure? proc) | |
419 | (ensure-accessor (if (generic-capability? proc) | |
420 | (make <generic> #:name name #:default proc) | |
421 | (ensure-generic proc name)) | |
422 | name)) | |
423 | (else | |
424 | (make-accessor name)))) | |
14f1d9fe | 425 | |
f8af5c6d | 426 | (define (upgrade-accessor generic setter) |
bbf8d523 MD |
427 | (let ((methods (slot-ref generic 'methods)) |
428 | (gws (make (if (is-a? generic <extended-generic>) | |
429 | <extended-generic-with-setter> | |
f8af5c6d | 430 | <accessor>) |
14f1d9fe | 431 | #:name (generic-function-name generic) |
bbf8d523 | 432 | #:extended-by (slot-ref generic 'extended-by) |
14f1d9fe | 433 | #:setter setter))) |
bbf8d523 MD |
434 | (if (is-a? generic <extended-generic>) |
435 | (let ((gfs (slot-ref generic 'extends))) | |
436 | (not-extended-by! gfs generic) | |
437 | (slot-set! gws 'extends gfs) | |
438 | (extended-by! gfs gws))) | |
14f1d9fe MD |
439 | ;; Steal old methods |
440 | (for-each (lambda (method) | |
441 | (slot-set! method 'generic-function gws)) | |
442 | methods) | |
443 | (slot-set! gws 'methods methods) | |
444 | gws)) | |
445 | ||
446 | ;;; | |
447 | ;;; {Methods} | |
448 | ;;; | |
449 | ||
2ce560b9 AW |
450 | (define (toplevel-define! name val) |
451 | (module-define! (current-module) name val)) | |
452 | ||
453 | (define-syntax define-method | |
454 | (syntax-rules (setter) | |
455 | ((_ ((setter name) . args) body ...) | |
456 | (begin | |
457 | (if (or (not (defined? 'name)) | |
458 | (not (is-a? name <accessor>))) | |
459 | (toplevel-define! 'name | |
460 | (ensure-accessor | |
461 | (if (defined? 'name) name #f) 'name))) | |
462 | (add-method! (setter name) (method args body ...)))) | |
463 | ((_ (name . args) body ...) | |
464 | (begin | |
465 | ;; FIXME: this code is how it always was, but it's quite cracky: | |
466 | ;; it will only define the generic function if it was undefined | |
467 | ;; before (ok), or *was defined to #f*. The latter is crack. But | |
468 | ;; there are bootstrap issues about fixing this -- change it to | |
469 | ;; (is-a? name <generic>) and see. | |
470 | (if (or (not (defined? 'name)) | |
471 | (not name)) | |
472 | (toplevel-define! 'name (make <generic> #:name 'name))) | |
473 | (add-method! name (method args body ...)))))) | |
14f1d9fe | 474 | |
47c8983f AW |
475 | (define-syntax method |
476 | (lambda (x) | |
d6392715 AW |
477 | (define (parse-args args) |
478 | (let lp ((ls args) (formals '()) (specializers '())) | |
47c8983f | 479 | (syntax-case ls () |
d6392715 | 480 | (((f s) . rest) |
0dd8493c AW |
481 | (and (identifier? #'f) (identifier? #'s)) |
482 | (lp #'rest | |
483 | (cons #'f formals) | |
484 | (cons #'s specializers))) | |
d6392715 | 485 | ((f . rest) |
0dd8493c AW |
486 | (identifier? #'f) |
487 | (lp #'rest | |
488 | (cons #'f formals) | |
489 | (cons #'<top> specializers))) | |
d6392715 AW |
490 | (() |
491 | (list (reverse formals) | |
0dd8493c | 492 | (reverse (cons #''() specializers)))) |
d6392715 | 493 | (tail |
0dd8493c AW |
494 | (identifier? #'tail) |
495 | (list (append (reverse formals) #'tail) | |
496 | (reverse (cons #'<top> specializers))))))) | |
47c8983f AW |
497 | |
498 | (define (find-free-id exp referent) | |
499 | (syntax-case exp () | |
500 | ((x . y) | |
0dd8493c AW |
501 | (or (find-free-id #'x referent) |
502 | (find-free-id #'y referent))) | |
47c8983f | 503 | (x |
0dd8493c AW |
504 | (identifier? #'x) |
505 | (let ((id (datum->syntax #'x referent))) | |
506 | (and (free-identifier=? #'x id) id))) | |
47c8983f AW |
507 | (_ #f))) |
508 | ||
509 | (define (compute-procedure formals body) | |
510 | (syntax-case body () | |
511 | ((body0 ...) | |
512 | (with-syntax ((formals formals)) | |
0dd8493c | 513 | #'(lambda formals body0 ...))))) |
47c8983f AW |
514 | |
515 | (define (->proper args) | |
516 | (let lp ((ls args) (out '())) | |
517 | (syntax-case ls () | |
0dd8493c | 518 | ((x . xs) (lp #'xs (cons #'x out))) |
47c8983f | 519 | (() (reverse out)) |
0dd8493c | 520 | (tail (reverse (cons #'tail out)))))) |
47c8983f AW |
521 | |
522 | (define (compute-make-procedure formals body next-method) | |
523 | (syntax-case body () | |
524 | ((body ...) | |
525 | (with-syntax ((next-method next-method)) | |
526 | (syntax-case formals () | |
527 | ((formal ...) | |
0dd8493c AW |
528 | #'(lambda (real-next-method) |
529 | (lambda (formal ...) | |
530 | (let ((next-method (lambda args | |
531 | (if (null? args) | |
532 | (real-next-method formal ...) | |
533 | (apply real-next-method args))))) | |
534 | body ...)))) | |
47c8983f | 535 | (formals |
0dd8493c AW |
536 | (with-syntax (((formal ...) (->proper #'formals))) |
537 | #'(lambda (real-next-method) | |
538 | (lambda formals | |
539 | (let ((next-method (lambda args | |
540 | (if (null? args) | |
541 | (apply real-next-method formal ...) | |
542 | (apply real-next-method args))))) | |
543 | body ...)))))))))) | |
47c8983f AW |
544 | |
545 | (define (compute-procedures formals body) | |
546 | ;; So, our use of this is broken, because it operates on the | |
547 | ;; pre-expansion source code. It's equivalent to just searching | |
548 | ;; for referent in the datums. Ah well. | |
549 | (let ((id (find-free-id body 'next-method))) | |
550 | (if id | |
551 | ;; return a make-procedure | |
0dd8493c | 552 | (values #'#f |
47c8983f AW |
553 | (compute-make-procedure formals body id)) |
554 | (values (compute-procedure formals body) | |
0dd8493c | 555 | #'#f)))) |
47c8983f AW |
556 | |
557 | (syntax-case x () | |
0dd8493c | 558 | ((_ args) #'(method args (if #f #f))) |
47c8983f | 559 | ((_ args body0 body1 ...) |
0dd8493c | 560 | (with-syntax (((formals (specializer ...)) (parse-args #'args))) |
47c8983f AW |
561 | (call-with-values |
562 | (lambda () | |
0dd8493c | 563 | (compute-procedures #'formals #'(body0 body1 ...))) |
47c8983f AW |
564 | (lambda (procedure make-procedure) |
565 | (with-syntax ((procedure procedure) | |
566 | (make-procedure make-procedure)) | |
0dd8493c AW |
567 | #'(make <method> |
568 | #:specializers (cons* specializer ...) | |
569 | #:formals 'formals | |
570 | #:body '(body0 body1 ...) | |
571 | #:make-procedure make-procedure | |
572 | #:procedure procedure))))))))) | |
14f1d9fe MD |
573 | |
574 | ;;; | |
575 | ;;; {add-method!} | |
576 | ;;; | |
577 | ||
578 | (define (add-method-in-classes! m) | |
579 | ;; Add method in all the classes which appears in its specializers list | |
580 | (for-each* (lambda (x) | |
581 | (let ((dm (class-direct-methods x))) | |
81600208 | 582 | (if (not (memq m dm)) |
14f1d9fe MD |
583 | (slot-set! x 'direct-methods (cons m dm))))) |
584 | (method-specializers m))) | |
585 | ||
586 | (define (remove-method-in-classes! m) | |
587 | ;; Remove method in all the classes which appears in its specializers list | |
588 | (for-each* (lambda (x) | |
589 | (slot-set! x | |
590 | 'direct-methods | |
591 | (delv! m (class-direct-methods x)))) | |
592 | (method-specializers m))) | |
593 | ||
594 | (define (compute-new-list-of-methods gf new) | |
595 | (let ((new-spec (method-specializers new)) | |
bbf8d523 | 596 | (methods (slot-ref gf 'methods))) |
14f1d9fe MD |
597 | (let loop ((l methods)) |
598 | (if (null? l) | |
599 | (cons new methods) | |
600 | (if (equal? (method-specializers (car l)) new-spec) | |
601 | (begin | |
602 | ;; This spec. list already exists. Remove old method from dependents | |
603 | (remove-method-in-classes! (car l)) | |
604 | (set-car! l new) | |
605 | methods) | |
606 | (loop (cdr l))))))) | |
607 | ||
7d38f3d8 AW |
608 | (define internal-add-method! |
609 | (method ((gf <generic>) (m <method>)) | |
610 | (slot-set! m 'generic-function gf) | |
611 | (slot-set! gf 'methods (compute-new-list-of-methods gf m)) | |
612 | (let ((specializers (slot-ref m 'specializers))) | |
613 | (slot-set! gf 'n-specialized | |
614 | (max (length* specializers) | |
615 | (slot-ref gf 'n-specialized)))) | |
616 | (%invalidate-method-cache! gf) | |
617 | (add-method-in-classes! m) | |
618 | *unspecified*)) | |
14f1d9fe MD |
619 | |
620 | (define-generic add-method!) | |
621 | ||
7d38f3d8 | 622 | ((method-procedure internal-add-method!) add-method! internal-add-method!) |
14f1d9fe | 623 | |
71d540f7 | 624 | (define-method (add-method! (proc <procedure>) (m <method>)) |
14f1d9fe MD |
625 | (if (generic-capability? proc) |
626 | (begin | |
627 | (enable-primitive-generic! proc) | |
628 | (add-method! proc m)) | |
629 | (next-method))) | |
630 | ||
71d540f7 | 631 | (define-method (add-method! (pg <primitive-generic>) (m <method>)) |
14f1d9fe MD |
632 | (add-method! (primitive-generic-generic pg) m)) |
633 | ||
71d540f7 | 634 | (define-method (add-method! obj (m <method>)) |
14f1d9fe MD |
635 | (goops-error "~S is not a valid generic function" obj)) |
636 | ||
637 | ;;; | |
638 | ;;; {Access to meta objects} | |
639 | ;;; | |
640 | ||
641 | ;;; | |
642 | ;;; Methods | |
643 | ;;; | |
71d540f7 | 644 | (define-method (method-source (m <method>)) |
14f1d9fe | 645 | (let* ((spec (map* class-name (slot-ref m 'specializers))) |
4e2f1e9e AW |
646 | (src (procedure-source (slot-ref m 'procedure)))) |
647 | (and src | |
648 | (let ((args (cadr src)) | |
649 | (body (cddr src))) | |
650 | (cons 'method | |
651 | (cons (map* list args spec) | |
652 | body)))))) | |
653 | ||
654 | (define-method (method-formals (m <method>)) | |
655 | (slot-ref m 'formals)) | |
14f1d9fe MD |
656 | |
657 | ;;; | |
658 | ;;; Slots | |
659 | ;;; | |
660 | (define slot-definition-name car) | |
661 | ||
662 | (define slot-definition-options cdr) | |
663 | ||
664 | (define (slot-definition-allocation s) | |
665 | (get-keyword #:allocation (cdr s) #:instance)) | |
666 | ||
667 | (define (slot-definition-getter s) | |
668 | (get-keyword #:getter (cdr s) #f)) | |
669 | ||
670 | (define (slot-definition-setter s) | |
671 | (get-keyword #:setter (cdr s) #f)) | |
672 | ||
673 | (define (slot-definition-accessor s) | |
674 | (get-keyword #:accessor (cdr s) #f)) | |
675 | ||
676 | (define (slot-definition-init-value s) | |
677 | ;; can be #f, so we can't use #f as non-value | |
678 | (get-keyword #:init-value (cdr s) (make-unbound))) | |
679 | ||
680 | (define (slot-definition-init-form s) | |
681 | (get-keyword #:init-form (cdr s) (make-unbound))) | |
682 | ||
683 | (define (slot-definition-init-thunk s) | |
684 | (get-keyword #:init-thunk (cdr s) #f)) | |
685 | ||
686 | (define (slot-definition-init-keyword s) | |
687 | (get-keyword #:init-keyword (cdr s) #f)) | |
688 | ||
689 | (define (class-slot-definition class slot-name) | |
690 | (assq slot-name (class-slots class))) | |
691 | ||
692 | (define (slot-init-function class slot-name) | |
693 | (cadr (assq slot-name (slot-ref class 'getters-n-setters)))) | |
694 | ||
51f66c91 AW |
695 | (define (accessor-method-slot-definition obj) |
696 | "Return the slot definition of the accessor @var{obj}." | |
697 | (slot-ref obj 'slot-definition)) | |
698 | ||
14f1d9fe MD |
699 | |
700 | ;;; | |
701 | ;;; {Standard methods used by the C runtime} | |
702 | ;;; | |
703 | ||
704 | ;;; Methods to compare objects | |
705 | ;;; | |
706 | ||
9f63ce02 AW |
707 | ;; Have to do this in a strange order because equal? is used in the |
708 | ;; add-method! implementation; we need to make sure that when the | |
709 | ;; primitive is extended, that the generic has a method. = | |
710 | (define g-equal? (make-generic 'equal?)) | |
711 | ;; When this generic gets called, we will have already checked eq? and | |
712 | ;; eqv? -- the purpose of this generic is to extend equality. So by | |
713 | ;; default, there is no extension, thus the #f return. | |
714 | (add-method! g-equal? (method (x y) #f)) | |
715 | (set-primitive-generic! equal? g-equal?) | |
a48d60b1 | 716 | |
14f1d9fe MD |
717 | ;;; |
718 | ;;; methods to display/write an object | |
719 | ;;; | |
720 | ||
721 | ; Code for writing objects must test that the slots they use are | |
722 | ; bound. Otherwise a slot-unbound method will be called and will | |
723 | ; conduct to an infinite loop. | |
724 | ||
725 | ;; Write | |
726 | (define (display-address o file) | |
727 | (display (number->string (object-address o) 16) file)) | |
728 | ||
71d540f7 | 729 | (define-method (write o file) |
14f1d9fe MD |
730 | (display "#<instance " file) |
731 | (display-address o file) | |
732 | (display #\> file)) | |
733 | ||
734 | (define write-object (primitive-generic-generic write)) | |
735 | ||
71d540f7 | 736 | (define-method (write (o <object>) file) |
14f1d9fe MD |
737 | (let ((class (class-of o))) |
738 | (if (slot-bound? class 'name) | |
739 | (begin | |
740 | (display "#<" file) | |
741 | (display (class-name class) file) | |
742 | (display #\space file) | |
743 | (display-address o file) | |
744 | (display #\> file)) | |
745 | (next-method)))) | |
746 | ||
71d540f7 | 747 | (define-method (write (class <class>) file) |
14f1d9fe MD |
748 | (let ((meta (class-of class))) |
749 | (if (and (slot-bound? class 'name) | |
750 | (slot-bound? meta 'name)) | |
751 | (begin | |
752 | (display "#<" file) | |
753 | (display (class-name meta) file) | |
754 | (display #\space file) | |
755 | (display (class-name class) file) | |
756 | (display #\space file) | |
757 | (display-address class file) | |
758 | (display #\> file)) | |
759 | (next-method)))) | |
760 | ||
71d540f7 | 761 | (define-method (write (gf <generic>) file) |
14f1d9fe MD |
762 | (let ((meta (class-of gf))) |
763 | (if (and (slot-bound? meta 'name) | |
764 | (slot-bound? gf 'methods)) | |
765 | (begin | |
766 | (display "#<" file) | |
767 | (display (class-name meta) file) | |
768 | (let ((name (generic-function-name gf))) | |
769 | (if name | |
770 | (begin | |
771 | (display #\space file) | |
772 | (display name file)))) | |
773 | (display " (" file) | |
774 | (display (length (generic-function-methods gf)) file) | |
775 | (display ")>" file)) | |
776 | (next-method)))) | |
777 | ||
71d540f7 | 778 | (define-method (write (o <method>) file) |
14f1d9fe MD |
779 | (let ((meta (class-of o))) |
780 | (if (and (slot-bound? meta 'name) | |
781 | (slot-bound? o 'specializers)) | |
782 | (begin | |
783 | (display "#<" file) | |
784 | (display (class-name meta) file) | |
785 | (display #\space file) | |
786 | (display (map* (lambda (spec) | |
787 | (if (slot-bound? spec 'name) | |
788 | (slot-ref spec 'name) | |
789 | spec)) | |
790 | (method-specializers o)) | |
791 | file) | |
792 | (display #\space file) | |
793 | (display-address o file) | |
794 | (display #\> file)) | |
795 | (next-method)))) | |
796 | ||
797 | ;; Display (do the same thing as write by default) | |
71d540f7 | 798 | (define-method (display o file) |
14f1d9fe MD |
799 | (write-object o file)) |
800 | ||
7b07e5ef MD |
801 | ;;; |
802 | ;;; Handling of duplicate bindings in the module system | |
803 | ;;; | |
804 | ||
805 | (define-method (merge-generics (module <module>) | |
806 | (name <symbol>) | |
807 | (int1 <module>) | |
808 | (val1 <top>) | |
809 | (int2 <module>) | |
810 | (val2 <top>) | |
811 | (var <top>) | |
812 | (val <top>)) | |
813 | #f) | |
814 | ||
815 | (define-method (merge-generics (module <module>) | |
816 | (name <symbol>) | |
817 | (int1 <module>) | |
818 | (val1 <generic>) | |
819 | (int2 <module>) | |
820 | (val2 <generic>) | |
821 | (var <top>) | |
822 | (val <boolean>)) | |
c9fa1748 MD |
823 | (and (not (eq? val1 val2)) |
824 | (make-variable (make-extended-generic (list val2 val1) name)))) | |
7b07e5ef MD |
825 | |
826 | (define-method (merge-generics (module <module>) | |
827 | (name <symbol>) | |
828 | (int1 <module>) | |
829 | (val1 <generic>) | |
830 | (int2 <module>) | |
831 | (val2 <generic>) | |
832 | (var <top>) | |
833 | (gf <extended-generic>)) | |
c9fa1748 MD |
834 | (and (not (memq val2 (slot-ref gf 'extends))) |
835 | (begin | |
836 | (slot-set! gf | |
837 | 'extends | |
838 | (cons val2 (delq! val2 (slot-ref gf 'extends)))) | |
839 | (slot-set! val2 | |
840 | 'extended-by | |
841 | (cons gf (delq! gf (slot-ref val2 'extended-by)))) | |
842 | var))) | |
7b07e5ef MD |
843 | |
844 | (module-define! duplicate-handlers 'merge-generics merge-generics) | |
845 | ||
f8af5c6d MD |
846 | (define-method (merge-accessors (module <module>) |
847 | (name <symbol>) | |
848 | (int1 <module>) | |
849 | (val1 <top>) | |
850 | (int2 <module>) | |
851 | (val2 <top>) | |
852 | (var <top>) | |
853 | (val <top>)) | |
854 | #f) | |
855 | ||
856 | (define-method (merge-accessors (module <module>) | |
857 | (name <symbol>) | |
858 | (int1 <module>) | |
859 | (val1 <accessor>) | |
860 | (int2 <module>) | |
861 | (val2 <accessor>) | |
862 | (var <top>) | |
863 | (val <top>)) | |
864 | (merge-generics module name int1 val1 int2 val2 var val)) | |
865 | ||
866 | (module-define! duplicate-handlers 'merge-accessors merge-accessors) | |
867 | ||
14f1d9fe MD |
868 | ;;; |
869 | ;;; slot access | |
870 | ;;; | |
871 | ||
872 | (define (class-slot-g-n-s class slot-name) | |
873 | (let* ((this-slot (assq slot-name (slot-ref class 'slots))) | |
874 | (g-n-s (cddr (or (assq slot-name (slot-ref class 'getters-n-setters)) | |
875 | (slot-missing class slot-name))))) | |
876 | (if (not (memq (slot-definition-allocation this-slot) | |
877 | '(#:class #:each-subclass))) | |
878 | (slot-missing class slot-name)) | |
879 | g-n-s)) | |
880 | ||
881 | (define (class-slot-ref class slot) | |
882 | (let ((x ((car (class-slot-g-n-s class slot)) #f))) | |
883 | (if (unbound? x) | |
884 | (slot-unbound class slot) | |
885 | x))) | |
886 | ||
887 | (define (class-slot-set! class slot value) | |
888 | ((cadr (class-slot-g-n-s class slot)) #f value)) | |
889 | ||
71d540f7 | 890 | (define-method (slot-unbound (c <class>) (o <object>) s) |
14f1d9fe MD |
891 | (goops-error "Slot `~S' is unbound in object ~S" s o)) |
892 | ||
71d540f7 | 893 | (define-method (slot-unbound (c <class>) s) |
14f1d9fe MD |
894 | (goops-error "Slot `~S' is unbound in class ~S" s c)) |
895 | ||
71d540f7 | 896 | (define-method (slot-unbound (o <object>)) |
14f1d9fe MD |
897 | (goops-error "Unbound slot in object ~S" o)) |
898 | ||
71d540f7 | 899 | (define-method (slot-missing (c <class>) (o <object>) s) |
14f1d9fe MD |
900 | (goops-error "No slot with name `~S' in object ~S" s o)) |
901 | ||
71d540f7 | 902 | (define-method (slot-missing (c <class>) s) |
14f1d9fe MD |
903 | (goops-error "No class slot with name `~S' in class ~S" s c)) |
904 | ||
905 | ||
71d540f7 | 906 | (define-method (slot-missing (c <class>) (o <object>) s value) |
14f1d9fe MD |
907 | (slot-missing c o s)) |
908 | ||
909 | ;;; Methods for the possible error we can encounter when calling a gf | |
910 | ||
71d540f7 | 911 | (define-method (no-next-method (gf <generic>) args) |
14f1d9fe MD |
912 | (goops-error "No next method when calling ~S\nwith arguments ~S" gf args)) |
913 | ||
71d540f7 | 914 | (define-method (no-applicable-method (gf <generic>) args) |
14f1d9fe MD |
915 | (goops-error "No applicable method for ~S in call ~S" |
916 | gf (cons (generic-function-name gf) args))) | |
917 | ||
71d540f7 | 918 | (define-method (no-method (gf <generic>) args) |
14f1d9fe MD |
919 | (goops-error "No method defined for ~S" gf)) |
920 | ||
921 | ;;; | |
922 | ;;; {Cloning functions (from rdeline@CS.CMU.EDU)} | |
923 | ;;; | |
924 | ||
71d540f7 | 925 | (define-method (shallow-clone (self <object>)) |
14f1d9fe MD |
926 | (let ((clone (%allocate-instance (class-of self) '())) |
927 | (slots (map slot-definition-name | |
928 | (class-slots (class-of self))))) | |
929 | (for-each (lambda (slot) | |
930 | (if (slot-bound? self slot) | |
931 | (slot-set! clone slot (slot-ref self slot)))) | |
932 | slots) | |
933 | clone)) | |
934 | ||
71d540f7 | 935 | (define-method (deep-clone (self <object>)) |
14f1d9fe MD |
936 | (let ((clone (%allocate-instance (class-of self) '())) |
937 | (slots (map slot-definition-name | |
938 | (class-slots (class-of self))))) | |
939 | (for-each (lambda (slot) | |
940 | (if (slot-bound? self slot) | |
941 | (slot-set! clone slot | |
942 | (let ((value (slot-ref self slot))) | |
943 | (if (instance? value) | |
944 | (deep-clone value) | |
945 | value))))) | |
946 | slots) | |
947 | clone)) | |
948 | ||
949 | ;;; | |
950 | ;;; {Class redefinition utilities} | |
951 | ;;; | |
952 | ||
953 | ;;; (class-redefinition OLD NEW) | |
954 | ;;; | |
955 | ||
956 | ;;; Has correct the following conditions: | |
957 | ||
958 | ;;; Methods | |
959 | ;;; | |
960 | ;;; 1. New accessor specializers refer to new header | |
961 | ;;; | |
962 | ;;; Classes | |
963 | ;;; | |
964 | ;;; 1. New class cpl refers to the new class header | |
965 | ;;; 2. Old class header exists on old super classes direct-subclass lists | |
966 | ;;; 3. New class header exists on new super classes direct-subclass lists | |
967 | ||
71d540f7 | 968 | (define-method (class-redefinition (old <class>) (new <class>)) |
14f1d9fe MD |
969 | ;; Work on direct methods: |
970 | ;; 1. Remove accessor methods from the old class | |
971 | ;; 2. Patch the occurences of new in the specializers by old | |
972 | ;; 3. Displace the methods from old to new | |
973 | (remove-class-accessors! old) ;; -1- | |
974 | (let ((methods (class-direct-methods new))) | |
975 | (for-each (lambda (m) | |
976 | (update-direct-method! m new old)) ;; -2- | |
977 | methods) | |
978 | (slot-set! new | |
979 | 'direct-methods | |
980 | (append methods (class-direct-methods old)))) | |
981 | ||
982 | ;; Substitute old for new in new cpl | |
983 | (set-car! (slot-ref new 'cpl) old) | |
984 | ||
985 | ;; Remove the old class from the direct-subclasses list of its super classes | |
986 | (for-each (lambda (c) (slot-set! c 'direct-subclasses | |
987 | (delv! old (class-direct-subclasses c)))) | |
988 | (class-direct-supers old)) | |
989 | ||
990 | ;; Replace the new class with the old in the direct-subclasses of the supers | |
991 | (for-each (lambda (c) | |
992 | (slot-set! c 'direct-subclasses | |
993 | (cons old (delv! new (class-direct-subclasses c))))) | |
994 | (class-direct-supers new)) | |
995 | ||
996 | ;; Swap object headers | |
997 | (%modify-class old new) | |
998 | ||
999 | ;; Now old is NEW! | |
1000 | ||
1001 | ;; Redefine all the subclasses of old to take into account modification | |
1002 | (for-each | |
1003 | (lambda (c) | |
1004 | (update-direct-subclass! c new old)) | |
1005 | (class-direct-subclasses new)) | |
1006 | ||
1007 | ;; Invalidate class so that subsequent instances slot accesses invoke | |
1008 | ;; change-object-class | |
1009 | (slot-set! new 'redefined old) | |
1010 | (%invalidate-class new) ;must come after slot-set! | |
1011 | ||
1012 | old) | |
1013 | ||
1014 | ;;; | |
1015 | ;;; remove-class-accessors! | |
1016 | ;;; | |
1017 | ||
71d540f7 | 1018 | (define-method (remove-class-accessors! (c <class>)) |
14f1d9fe MD |
1019 | (for-each (lambda (m) |
1020 | (if (is-a? m <accessor-method>) | |
58241edc MD |
1021 | (let ((gf (slot-ref m 'generic-function))) |
1022 | ;; remove the method from its GF | |
1023 | (slot-set! gf 'methods | |
1024 | (delq1! m (slot-ref gf 'methods))) | |
1025 | (%invalidate-method-cache! gf) | |
1026 | ;; remove the method from its specializers | |
1027 | (remove-method-in-classes! m)))) | |
14f1d9fe MD |
1028 | (class-direct-methods c))) |
1029 | ||
1030 | ;;; | |
1031 | ;;; update-direct-method! | |
1032 | ;;; | |
1033 | ||
71d540f7 | 1034 | (define-method (update-direct-method! (m <method>) |
14f1d9fe MD |
1035 | (old <class>) |
1036 | (new <class>)) | |
1037 | (let loop ((l (method-specializers m))) | |
1038 | ;; Note: the <top> in dotted list is never used. | |
1039 | ;; So we can work as if we had only proper lists. | |
1040 | (if (pair? l) | |
1041 | (begin | |
1042 | (if (eqv? (car l) old) | |
1043 | (set-car! l new)) | |
1044 | (loop (cdr l)))))) | |
1045 | ||
1046 | ;;; | |
1047 | ;;; update-direct-subclass! | |
1048 | ;;; | |
1049 | ||
71d540f7 | 1050 | (define-method (update-direct-subclass! (c <class>) |
14f1d9fe MD |
1051 | (old <class>) |
1052 | (new <class>)) | |
1053 | (class-redefinition c | |
1054 | (make-class (class-direct-supers c) | |
1055 | (class-direct-slots c) | |
1056 | #:name (class-name c) | |
14f1d9fe MD |
1057 | #:metaclass (class-of c)))) |
1058 | ||
1059 | ;;; | |
1060 | ;;; {Utilities for INITIALIZE methods} | |
1061 | ;;; | |
1062 | ||
1063 | ;;; compute-slot-accessors | |
1064 | ;;; | |
9d019f9b | 1065 | (define (compute-slot-accessors class slots) |
14f1d9fe MD |
1066 | (for-each |
1067 | (lambda (s g-n-s) | |
a2ca7252 | 1068 | (let ((getter-function (slot-definition-getter s)) |
14f1d9fe MD |
1069 | (setter-function (slot-definition-setter s)) |
1070 | (accessor (slot-definition-accessor s))) | |
1071 | (if getter-function | |
1072 | (add-method! getter-function | |
1073 | (compute-getter-method class g-n-s))) | |
1074 | (if setter-function | |
1075 | (add-method! setter-function | |
1076 | (compute-setter-method class g-n-s))) | |
1077 | (if accessor | |
1078 | (begin | |
1079 | (add-method! accessor | |
1080 | (compute-getter-method class g-n-s)) | |
1081 | (add-method! (setter accessor) | |
1082 | (compute-setter-method class g-n-s)))))) | |
1083 | slots (slot-ref class 'getters-n-setters))) | |
1084 | ||
71d540f7 | 1085 | (define-method (compute-getter-method (class <class>) slotdef) |
14f1d9fe MD |
1086 | (let ((init-thunk (cadr slotdef)) |
1087 | (g-n-s (cddr slotdef))) | |
1088 | (make <accessor-method> | |
1089 | #:specializers (list class) | |
1090 | #:procedure (cond ((pair? g-n-s) | |
58241edc | 1091 | (make-generic-bound-check-getter (car g-n-s))) |
14f1d9fe MD |
1092 | (init-thunk |
1093 | (standard-get g-n-s)) | |
1094 | (else | |
1095 | (bound-check-get g-n-s))) | |
1096 | #:slot-definition slotdef))) | |
1097 | ||
71d540f7 | 1098 | (define-method (compute-setter-method (class <class>) slotdef) |
14f1d9fe MD |
1099 | (let ((g-n-s (cddr slotdef))) |
1100 | (make <accessor-method> | |
1101 | #:specializers (list class <top>) | |
1102 | #:procedure (if (pair? g-n-s) | |
1103 | (cadr g-n-s) | |
1104 | (standard-set g-n-s)) | |
1105 | #:slot-definition slotdef))) | |
1106 | ||
1107 | (define (make-generic-bound-check-getter proc) | |
8397a3a6 | 1108 | (lambda (o) (assert-bound (proc o) o))) |
14f1d9fe | 1109 | |
5192c9e8 AW |
1110 | ;; the idea is to compile the index into the procedure, for fastest |
1111 | ;; lookup. Also, @slot-ref and @slot-set! have their own bytecodes. | |
ac0e91c4 | 1112 | |
b15dea68 AW |
1113 | (eval-when (eval load compile) |
1114 | (define num-standard-pre-cache 20)) | |
abd6af11 AW |
1115 | |
1116 | (define-macro (define-standard-accessor-method form . body) | |
1117 | (let ((name (caar form)) | |
1118 | (n-var (cadar form)) | |
1119 | (args (cdr form))) | |
1120 | (define (make-one x) | |
1121 | (define (body-trans form) | |
1122 | (cond ((not (pair? form)) form) | |
1123 | ((eq? (car form) '@slot-ref) | |
1124 | `(,(car form) ,(cadr form) ,x)) | |
1125 | ((eq? (car form) '@slot-set!) | |
1126 | `(,(car form) ,(cadr form) ,x ,(cadddr form))) | |
1127 | (else | |
1128 | (map body-trans form)))) | |
1129 | `(lambda ,args ,@(map body-trans body))) | |
1130 | `(define ,name | |
1131 | (let ((cache (vector ,@(map make-one (iota num-standard-pre-cache))))) | |
1132 | (lambda (n) | |
1133 | (if (< n ,num-standard-pre-cache) | |
1134 | (vector-ref cache n) | |
1135 | ((lambda (,n-var) (lambda ,args ,@body)) n))))))) | |
1136 | ||
1137 | (define-standard-accessor-method ((bound-check-get n) o) | |
1138 | (let ((x (@slot-ref o n))) | |
1139 | (if (unbound? x) | |
84012ef4 | 1140 | (slot-unbound o) |
abd6af11 AW |
1141 | x))) |
1142 | ||
1143 | (define-standard-accessor-method ((standard-get n) o) | |
1144 | (@slot-ref o n)) | |
1145 | ||
1146 | (define-standard-accessor-method ((standard-set n) o v) | |
1147 | (@slot-set! o n v)) | |
14f1d9fe MD |
1148 | |
1149 | ;;; compute-getters-n-setters | |
05a6b2d3 | 1150 | ;;; |
9d019f9b | 1151 | (define (compute-getters-n-setters class slots) |
14f1d9fe | 1152 | |
266f3a23 MD |
1153 | (define (compute-slot-init-function name s) |
1154 | (or (let ((thunk (slot-definition-init-thunk s))) | |
1155 | (and thunk | |
314b8716 AW |
1156 | (if (thunk? thunk) |
1157 | thunk | |
1158 | (goops-error "Bad init-thunk for slot `~S' in ~S: ~S" | |
1159 | name class thunk)))) | |
14f1d9fe MD |
1160 | (let ((init (slot-definition-init-value s))) |
1161 | (and (not (unbound? init)) | |
1162 | (lambda () init))))) | |
1163 | ||
1164 | (define (verify-accessors slot l) | |
21ab2aeb MD |
1165 | (cond ((integer? l)) |
1166 | ((not (and (list? l) (= (length l) 2))) | |
1167 | (goops-error "Bad getter and setter for slot `~S' in ~S: ~S" | |
1168 | slot class l)) | |
1169 | (else | |
1170 | (let ((get (car l)) | |
1171 | (set (cadr l))) | |
314b8716 AW |
1172 | (if (not (procedure? get)) |
1173 | (goops-error "Bad getter closure for slot `~S' in ~S: ~S" | |
21ab2aeb | 1174 | slot class get)) |
314b8716 AW |
1175 | (if (not (procedure? set)) |
1176 | (goops-error "Bad setter closure for slot `~S' in ~S: ~S" | |
21ab2aeb | 1177 | slot class set)))))) |
14f1d9fe MD |
1178 | |
1179 | (map (lambda (s) | |
21ab2aeb MD |
1180 | ;; The strange treatment of nfields is due to backward compatibility. |
1181 | (let* ((index (slot-ref class 'nfields)) | |
1182 | (g-n-s (compute-get-n-set class s)) | |
1183 | (size (- (slot-ref class 'nfields) index)) | |
14f1d9fe | 1184 | (name (slot-definition-name s))) |
21ab2aeb MD |
1185 | ;; NOTE: The following is interdependent with C macros |
1186 | ;; defined above goops.c:scm_sys_prep_layout_x. | |
1187 | ;; | |
1188 | ;; For simple instance slots, we have the simplest form | |
1189 | ;; '(name init-function . index) | |
1190 | ;; For other slots we have | |
1191 | ;; '(name init-function getter setter . alloc) | |
1192 | ;; where alloc is: | |
1193 | ;; '(index size) for instance allocated slots | |
1194 | ;; '() for other slots | |
14f1d9fe MD |
1195 | (verify-accessors name g-n-s) |
1196 | (cons name | |
266f3a23 | 1197 | (cons (compute-slot-init-function name s) |
21ab2aeb MD |
1198 | (if (or (integer? g-n-s) |
1199 | (zero? size)) | |
1200 | g-n-s | |
e1ac894c | 1201 | (append g-n-s (list index size))))))) |
14f1d9fe MD |
1202 | slots)) |
1203 | ||
1204 | ;;; compute-cpl | |
1205 | ;;; | |
1206 | ;;; Correct behaviour: | |
1207 | ;;; | |
1208 | ;;; (define-class food ()) | |
1209 | ;;; (define-class fruit (food)) | |
1210 | ;;; (define-class spice (food)) | |
1211 | ;;; (define-class apple (fruit)) | |
1212 | ;;; (define-class cinnamon (spice)) | |
1213 | ;;; (define-class pie (apple cinnamon)) | |
1214 | ;;; => cpl (pie) = pie apple fruit cinnamon spice food object top | |
1215 | ;;; | |
1216 | ;;; (define-class d ()) | |
1217 | ;;; (define-class e ()) | |
1218 | ;;; (define-class f ()) | |
1219 | ;;; (define-class b (d e)) | |
1220 | ;;; (define-class c (e f)) | |
1221 | ;;; (define-class a (b c)) | |
1222 | ;;; => cpl (a) = a b d c e f object top | |
1223 | ;;; | |
1224 | ||
71d540f7 | 1225 | (define-method (compute-cpl (class <class>)) |
14f1d9fe MD |
1226 | (compute-std-cpl class class-direct-supers)) |
1227 | ||
1228 | ;; Support | |
1229 | ||
1230 | (define (only-non-null lst) | |
1231 | (filter (lambda (l) (not (null? l))) lst)) | |
1232 | ||
1233 | (define (compute-std-cpl c get-direct-supers) | |
1234 | (let ((c-direct-supers (get-direct-supers c))) | |
1235 | (merge-lists (list c) | |
1236 | (only-non-null (append (map class-precedence-list | |
1237 | c-direct-supers) | |
1238 | (list c-direct-supers)))))) | |
1239 | ||
1240 | (define (merge-lists reversed-partial-result inputs) | |
1241 | (cond | |
1242 | ((every null? inputs) | |
1243 | (reverse! reversed-partial-result)) | |
1244 | (else | |
1245 | (let* ((candidate (lambda (c) | |
1246 | (and (not (any (lambda (l) | |
1247 | (memq c (cdr l))) | |
1248 | inputs)) | |
1249 | c))) | |
1250 | (candidate-car (lambda (l) | |
1251 | (and (not (null? l)) | |
1252 | (candidate (car l))))) | |
1253 | (next (any candidate-car inputs))) | |
1254 | (if (not next) | |
1255 | (goops-error "merge-lists: Inconsistent precedence graph")) | |
1256 | (let ((remove-next (lambda (l) | |
1257 | (if (eq? (car l) next) | |
1258 | (cdr l) | |
1259 | l)))) | |
1260 | (merge-lists (cons next reversed-partial-result) | |
1261 | (only-non-null (map remove-next inputs)))))))) | |
1262 | ||
1263 | ;; Modified from TinyClos: | |
1264 | ;; | |
1265 | ;; A simple topological sort. | |
1266 | ;; | |
1267 | ;; It's in this file so that both TinyClos and Objects can use it. | |
1268 | ;; | |
1269 | ;; This is a fairly modified version of code I originally got from Anurag | |
1270 | ;; Mendhekar <anurag@moose.cs.indiana.edu>. | |
1271 | ;; | |
1272 | ||
1273 | (define (compute-clos-cpl c get-direct-supers) | |
1274 | (top-sort ((build-transitive-closure get-direct-supers) c) | |
1275 | ((build-constraints get-direct-supers) c) | |
1276 | (std-tie-breaker get-direct-supers))) | |
1277 | ||
1278 | ||
1279 | (define (top-sort elements constraints tie-breaker) | |
1280 | (let loop ((elements elements) | |
1281 | (constraints constraints) | |
1282 | (result '())) | |
1283 | (if (null? elements) | |
1284 | result | |
1285 | (let ((can-go-in-now | |
1286 | (filter | |
1287 | (lambda (x) | |
1288 | (every (lambda (constraint) | |
1289 | (or (not (eq? (cadr constraint) x)) | |
1290 | (memq (car constraint) result))) | |
1291 | constraints)) | |
1292 | elements))) | |
1293 | (if (null? can-go-in-now) | |
1294 | (goops-error "top-sort: Invalid constraints") | |
1295 | (let ((choice (if (null? (cdr can-go-in-now)) | |
1296 | (car can-go-in-now) | |
1297 | (tie-breaker result | |
1298 | can-go-in-now)))) | |
1299 | (loop | |
1300 | (filter (lambda (x) (not (eq? x choice))) | |
b0dff018 | 1301 | elements) |
14f1d9fe MD |
1302 | constraints |
1303 | (append result (list choice))))))))) | |
1304 | ||
1305 | (define (std-tie-breaker get-supers) | |
1306 | (lambda (partial-cpl min-elts) | |
1307 | (let loop ((pcpl (reverse partial-cpl))) | |
1308 | (let ((current-elt (car pcpl))) | |
1309 | (let ((ds-of-ce (get-supers current-elt))) | |
1310 | (let ((common (filter (lambda (x) | |
1311 | (memq x ds-of-ce)) | |
1312 | min-elts))) | |
1313 | (if (null? common) | |
1314 | (if (null? (cdr pcpl)) | |
1315 | (goops-error "std-tie-breaker: Nothing valid") | |
1316 | (loop (cdr pcpl))) | |
1317 | (car common)))))))) | |
1318 | ||
1319 | ||
1320 | (define (build-transitive-closure get-follow-ons) | |
1321 | (lambda (x) | |
1322 | (let track ((result '()) | |
1323 | (pending (list x))) | |
1324 | (if (null? pending) | |
1325 | result | |
1326 | (let ((next (car pending))) | |
1327 | (if (memq next result) | |
1328 | (track result (cdr pending)) | |
1329 | (track (cons next result) | |
1330 | (append (get-follow-ons next) | |
1331 | (cdr pending))))))))) | |
1332 | ||
1333 | (define (build-constraints get-follow-ons) | |
1334 | (lambda (x) | |
1335 | (let loop ((elements ((build-transitive-closure get-follow-ons) x)) | |
1336 | (this-one '()) | |
1337 | (result '())) | |
1338 | (if (or (null? this-one) (null? (cdr this-one))) | |
1339 | (if (null? elements) | |
1340 | result | |
1341 | (loop (cdr elements) | |
1342 | (cons (car elements) | |
1343 | (get-follow-ons (car elements))) | |
1344 | result)) | |
1345 | (loop elements | |
1346 | (cdr this-one) | |
1347 | (cons (list (car this-one) (cadr this-one)) | |
1348 | result)))))) | |
1349 | ||
1350 | ;;; compute-get-n-set | |
1351 | ;;; | |
71d540f7 | 1352 | (define-method (compute-get-n-set (class <class>) s) |
14f1d9fe MD |
1353 | (case (slot-definition-allocation s) |
1354 | ((#:instance) ;; Instance slot | |
1355 | ;; get-n-set is just its offset | |
1356 | (let ((already-allocated (slot-ref class 'nfields))) | |
1357 | (slot-set! class 'nfields (+ already-allocated 1)) | |
1358 | already-allocated)) | |
1359 | ||
1360 | ((#:class) ;; Class slot | |
1361 | ;; Class-slots accessors are implemented as 2 closures around | |
1362 | ;; a Scheme variable. As instance slots, class slots must be | |
1363 | ;; unbound at init time. | |
1364 | (let ((name (slot-definition-name s))) | |
1365 | (if (memq name (map slot-definition-name (class-direct-slots class))) | |
1366 | ;; This slot is direct; create a new shared variable | |
1367 | (make-closure-variable class) | |
1368 | ;; Slot is inherited. Find its definition in superclass | |
1369 | (let loop ((l (cdr (class-precedence-list class)))) | |
1370 | (let ((r (assoc name (slot-ref (car l) 'getters-n-setters)))) | |
1371 | (if r | |
1372 | (cddr r) | |
1373 | (loop (cdr l)))))))) | |
1374 | ||
1375 | ((#:each-subclass) ;; slot shared by instances of direct subclass. | |
1376 | ;; (Thomas Buerger, April 1998) | |
1377 | (make-closure-variable class)) | |
1378 | ||
1379 | ((#:virtual) ;; No allocation | |
1380 | ;; slot-ref and slot-set! function must be given by the user | |
1381 | (let ((get (get-keyword #:slot-ref (slot-definition-options s) #f)) | |
a2ca7252 | 1382 | (set (get-keyword #:slot-set! (slot-definition-options s) #f))) |
14f1d9fe | 1383 | (if (not (and get set)) |
3a43b605 | 1384 | (goops-error "You must supply a #:slot-ref and a #:slot-set! in ~S" |
14f1d9fe MD |
1385 | s)) |
1386 | (list get set))) | |
1387 | (else (next-method)))) | |
1388 | ||
1389 | (define (make-closure-variable class) | |
1390 | (let ((shared-variable (make-unbound))) | |
1391 | (list (lambda (o) shared-variable) | |
1392 | (lambda (o v) (set! shared-variable v))))) | |
1393 | ||
71d540f7 | 1394 | (define-method (compute-get-n-set (o <object>) s) |
14f1d9fe MD |
1395 | (goops-error "Allocation \"~S\" is unknown" (slot-definition-allocation s))) |
1396 | ||
71d540f7 | 1397 | (define-method (compute-slots (class <class>)) |
14f1d9fe MD |
1398 | (%compute-slots class)) |
1399 | ||
1400 | ;;; | |
1401 | ;;; {Initialize} | |
1402 | ;;; | |
1403 | ||
71d540f7 | 1404 | (define-method (initialize (object <object>) initargs) |
14f1d9fe MD |
1405 | (%initialize-object object initargs)) |
1406 | ||
71d540f7 | 1407 | (define-method (initialize (class <class>) initargs) |
14f1d9fe MD |
1408 | (next-method) |
1409 | (let ((dslots (get-keyword #:slots initargs '())) | |
9d019f9b | 1410 | (supers (get-keyword #:dsupers initargs '()))) |
14f1d9fe MD |
1411 | (slot-set! class 'name (get-keyword #:name initargs '???)) |
1412 | (slot-set! class 'direct-supers supers) | |
1413 | (slot-set! class 'direct-slots dslots) | |
1414 | (slot-set! class 'direct-subclasses '()) | |
1415 | (slot-set! class 'direct-methods '()) | |
1416 | (slot-set! class 'cpl (compute-cpl class)) | |
1417 | (slot-set! class 'redefined #f) | |
14f1d9fe MD |
1418 | (let ((slots (compute-slots class))) |
1419 | (slot-set! class 'slots slots) | |
1420 | (slot-set! class 'nfields 0) | |
1421 | (slot-set! class 'getters-n-setters (compute-getters-n-setters class | |
9d019f9b | 1422 | slots)) |
14f1d9fe | 1423 | ;; Build getters - setters - accessors |
9d019f9b | 1424 | (compute-slot-accessors class slots)) |
14f1d9fe MD |
1425 | |
1426 | ;; Update the "direct-subclasses" of each inherited classes | |
1427 | (for-each (lambda (x) | |
1428 | (slot-set! x | |
1429 | 'direct-subclasses | |
1430 | (cons class (slot-ref x 'direct-subclasses)))) | |
1431 | supers) | |
1432 | ||
1433 | ;; Support for the underlying structs: | |
1434 | ||
14f1d9fe | 1435 | ;; Set the layout slot |
51f66c91 AW |
1436 | (%prep-layout! class) |
1437 | ;; Inherit class flags (invisible on scheme level) from supers | |
1438 | (%inherit-magic! class supers))) | |
14f1d9fe | 1439 | |
14f1d9fe MD |
1440 | (define (initialize-object-procedure object initargs) |
1441 | (let ((proc (get-keyword #:procedure initargs #f))) | |
1442 | (cond ((not proc)) | |
1443 | ((pair? proc) | |
962b9103 | 1444 | (apply slot-set! object 'procedure proc)) |
14f1d9fe | 1445 | (else |
962b9103 | 1446 | (slot-set! object 'procedure proc))))) |
14f1d9fe | 1447 | |
51f66c91 | 1448 | (define-method (initialize (applicable-struct <applicable-struct>) initargs) |
14f1d9fe | 1449 | (next-method) |
51f66c91 | 1450 | (initialize-object-procedure applicable-struct initargs)) |
14f1d9fe | 1451 | |
71d540f7 | 1452 | (define-method (initialize (generic <generic>) initargs) |
14f1d9fe MD |
1453 | (let ((previous-definition (get-keyword #:default initargs #f)) |
1454 | (name (get-keyword #:name initargs #f))) | |
1455 | (next-method) | |
1456 | (slot-set! generic 'methods (if (is-a? previous-definition <procedure>) | |
7d38f3d8 AW |
1457 | (list (method args |
1458 | (apply previous-definition args))) | |
14f1d9fe MD |
1459 | '())) |
1460 | (if name | |
1461 | (set-procedure-property! generic 'name name)) | |
1462 | )) | |
1463 | ||
51f66c91 AW |
1464 | (define-method (initialize (gws <generic-with-setter>) initargs) |
1465 | (next-method) | |
1466 | (%set-object-setter! gws (get-keyword #:setter initargs #f))) | |
1467 | ||
bbf8d523 MD |
1468 | (define-method (initialize (eg <extended-generic>) initargs) |
1469 | (next-method) | |
1470 | (slot-set! eg 'extends (get-keyword #:extends initargs '()))) | |
1471 | ||
b432fb4b MD |
1472 | (define dummy-procedure (lambda args *unspecified*)) |
1473 | ||
71d540f7 | 1474 | (define-method (initialize (method <method>) initargs) |
14f1d9fe MD |
1475 | (next-method) |
1476 | (slot-set! method 'generic-function (get-keyword #:generic-function initargs #f)) | |
1477 | (slot-set! method 'specializers (get-keyword #:specializers initargs '())) | |
b432fb4b | 1478 | (slot-set! method 'procedure |
e177058b | 1479 | (get-keyword #:procedure initargs #f)) |
21497600 AW |
1480 | (slot-set! method 'formals (get-keyword #:formals initargs '())) |
1481 | (slot-set! method 'body (get-keyword #:body initargs '())) | |
e177058b | 1482 | (slot-set! method 'make-procedure (get-keyword #:make-procedure initargs #f))) |
21497600 | 1483 | |
14f1d9fe | 1484 | |
14f1d9fe MD |
1485 | ;;; |
1486 | ;;; {Change-class} | |
1487 | ;;; | |
1488 | ||
1489 | (define (change-object-class old-instance old-class new-class) | |
cc6c7fee | 1490 | (let ((new-instance (allocate-instance new-class '()))) |
8378b269 | 1491 | ;; Initialize the slots of the new instance |
14f1d9fe MD |
1492 | (for-each (lambda (slot) |
1493 | (if (and (slot-exists-using-class? old-class old-instance slot) | |
1494 | (eq? (slot-definition-allocation | |
1495 | (class-slot-definition old-class slot)) | |
1496 | #:instance) | |
1497 | (slot-bound-using-class? old-class old-instance slot)) | |
1498 | ;; Slot was present and allocated in old instance; copy it | |
1499 | (slot-set-using-class! | |
1500 | new-class | |
1501 | new-instance | |
1502 | slot | |
1503 | (slot-ref-using-class old-class old-instance slot)) | |
1504 | ;; slot was absent; initialize it with its default value | |
1505 | (let ((init (slot-init-function new-class slot))) | |
1506 | (if init | |
1507 | (slot-set-using-class! | |
1508 | new-class | |
1509 | new-instance | |
1510 | slot | |
1511 | (apply init '())))))) | |
1512 | (map slot-definition-name (class-slots new-class))) | |
1513 | ;; Exchange old and new instance in place to keep pointers valid | |
1514 | (%modify-instance old-instance new-instance) | |
1515 | ;; Allow class specific updates of instances (which now are swapped) | |
1516 | (update-instance-for-different-class new-instance old-instance) | |
1517 | old-instance)) | |
1518 | ||
1519 | ||
71d540f7 | 1520 | (define-method (update-instance-for-different-class (old-instance <object>) |
14f1d9fe MD |
1521 | (new-instance |
1522 | <object>)) | |
1523 | ;;not really important what we do, we just need a default method | |
1524 | new-instance) | |
1525 | ||
71d540f7 | 1526 | (define-method (change-class (old-instance <object>) (new-class <class>)) |
14f1d9fe MD |
1527 | (change-object-class old-instance (class-of old-instance) new-class)) |
1528 | ||
1529 | ;;; | |
1530 | ;;; {make} | |
1531 | ;;; | |
1532 | ;;; A new definition which overwrites the previous one which was built-in | |
1533 | ;;; | |
1534 | ||
71d540f7 | 1535 | (define-method (allocate-instance (class <class>) initargs) |
14f1d9fe MD |
1536 | (%allocate-instance class initargs)) |
1537 | ||
71d540f7 | 1538 | (define-method (make-instance (class <class>) . initargs) |
14f1d9fe MD |
1539 | (let ((instance (allocate-instance class initargs))) |
1540 | (initialize instance initargs) | |
1541 | instance)) | |
1542 | ||
1543 | (define make make-instance) | |
1544 | ||
1545 | ;;; | |
1546 | ;;; {apply-generic} | |
1547 | ;;; | |
1548 | ;;; Protocol for calling standard generic functions. This protocol is | |
1549 | ;;; not used for real <generic> functions (in this case we use a | |
1550 | ;;; completely C hard-coded protocol). Apply-generic is used by | |
1551 | ;;; goops for calls to subclasses of <generic> and <generic-with-setter>. | |
1552 | ;;; The code below is similar to the first MOP described in AMOP. In | |
1553 | ;;; particular, it doesn't used the currified approach to gf | |
1554 | ;;; call. There are 2 reasons for that: | |
1555 | ;;; - the protocol below is exposed to mimic completely the one written in C | |
1556 | ;;; - the currified protocol would be imho inefficient in C. | |
1557 | ;;; | |
1558 | ||
71d540f7 | 1559 | (define-method (apply-generic (gf <generic>) args) |
14f1d9fe MD |
1560 | (if (null? (slot-ref gf 'methods)) |
1561 | (no-method gf args)) | |
1562 | (let ((methods (compute-applicable-methods gf args))) | |
1563 | (if methods | |
1564 | (apply-methods gf (sort-applicable-methods gf methods args) args) | |
1565 | (no-applicable-method gf args)))) | |
1566 | ||
1567 | ;; compute-applicable-methods is bound to %compute-applicable-methods. | |
1568 | ;; *fixme* use let | |
1569 | (define %%compute-applicable-methods | |
1570 | (make <generic> #:name 'compute-applicable-methods)) | |
1571 | ||
71d540f7 | 1572 | (define-method (%%compute-applicable-methods (gf <generic>) args) |
14f1d9fe MD |
1573 | (%compute-applicable-methods gf args)) |
1574 | ||
1575 | (set! compute-applicable-methods %%compute-applicable-methods) | |
1576 | ||
71d540f7 | 1577 | (define-method (sort-applicable-methods (gf <generic>) methods args) |
14f1d9fe MD |
1578 | (let ((targs (map class-of args))) |
1579 | (sort methods (lambda (m1 m2) (method-more-specific? m1 m2 targs))))) | |
1580 | ||
71d540f7 | 1581 | (define-method (method-more-specific? (m1 <method>) (m2 <method>) targs) |
14f1d9fe MD |
1582 | (%method-more-specific? m1 m2 targs)) |
1583 | ||
71d540f7 | 1584 | (define-method (apply-method (gf <generic>) methods build-next args) |
14f1d9fe MD |
1585 | (apply (method-procedure (car methods)) |
1586 | (build-next (cdr methods) args) | |
1587 | args)) | |
1588 | ||
71d540f7 | 1589 | (define-method (apply-methods (gf <generic>) (l <list>) args) |
14f1d9fe MD |
1590 | (letrec ((next (lambda (procs args) |
1591 | (lambda new-args | |
1592 | (let ((a (if (null? new-args) args new-args))) | |
1593 | (if (null? procs) | |
1594 | (no-next-method gf a) | |
1595 | (apply-method gf procs next a))))))) | |
1596 | (apply-method gf l next args))) | |
1597 | ||
1598 | ;; We don't want the following procedure to turn up in backtraces: | |
1599 | (for-each (lambda (proc) | |
1600 | (set-procedure-property! proc 'system-procedure #t)) | |
1601 | (list slot-unbound | |
1602 | slot-missing | |
1603 | no-next-method | |
1604 | no-applicable-method | |
1605 | no-method | |
1606 | )) | |
1607 | ||
1608 | ;;; | |
1609 | ;;; {<composite-metaclass> and <active-metaclass>} | |
1610 | ;;; | |
1611 | ||
1612 | ;(autoload "active-slot" <active-metaclass>) | |
1613 | ;(autoload "composite-slot" <composite-metaclass>) | |
1614 | ;(export <composite-metaclass> <active-metaclass>) | |
1615 | ||
1616 | ;;; | |
1617 | ;;; {Tools} | |
1618 | ;;; | |
1619 | ||
1620 | ;; list2set | |
1621 | ;; | |
1622 | ;; duplicate the standard list->set function but using eq instead of | |
1623 | ;; eqv which really sucks a lot, uselessly here | |
1624 | ;; | |
1625 | (define (list2set l) | |
1626 | (let loop ((l l) | |
1627 | (res '())) | |
1628 | (cond | |
1629 | ((null? l) res) | |
1630 | ((memq (car l) res) (loop (cdr l) res)) | |
1631 | (else (loop (cdr l) (cons (car l) res)))))) | |
1632 | ||
1633 | (define (class-subclasses c) | |
1634 | (letrec ((allsubs (lambda (c) | |
1635 | (cons c (mapappend allsubs | |
1636 | (class-direct-subclasses c)))))) | |
1637 | (list2set (cdr (allsubs c))))) | |
1638 | ||
1639 | (define (class-methods c) | |
1640 | (list2set (mapappend class-direct-methods | |
1641 | (cons c (class-subclasses c))))) | |
1642 | ||
1643 | ;;; | |
1644 | ;;; {Final initialization} | |
1645 | ;;; | |
1646 | ||
1647 | ;; Tell C code that the main bulk of Goops has been loaded | |
1648 | (%goops-loaded) |