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6be07c52 TTN |
1 | ;;; srfi-1.scm --- List Library |
2 | ||
f595ccfe | 3 | ;; Copyright (C) 2001, 2002, 2003 Free Software Foundation, Inc. |
6be07c52 | 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 | |
8 | ;; version 2.1 of the License, or (at your option) any later version. | |
9 | ;; | |
10 | ;; This library is distributed in the hope that it will be useful, | |
6be07c52 TTN |
11 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
73be1d9e MV |
13 | ;; Lesser General Public License for more details. |
14 | ;; | |
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 | |
17 | ;; Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
e9680547 MG |
18 | |
19 | ;;; Author: Martin Grabmueller <mgrabmue@cs.tu-berlin.de> | |
20 | ;;; Date: 2001-06-06 | |
21 | ||
22 | ;;; Commentary: | |
23 | ||
6be07c52 TTN |
24 | ;; This is an implementation of SRFI-1 (List Library). |
25 | ;; | |
26 | ;; All procedures defined in SRFI-1, which are not already defined in | |
27 | ;; the Guile core library, are exported. The procedures in this | |
28 | ;; implementation work, but they have not been tuned for speed or | |
29 | ;; memory usage. | |
30 | ;; | |
31 | ;; This module is fully documented in the Guile Reference Manual. | |
e9680547 MG |
32 | |
33 | ;;; Code: | |
34 | ||
35 | (define-module (srfi srfi-1) | |
563058ef | 36 | :use-module (ice-9 session) |
f595ccfe MD |
37 | :use-module (ice-9 receive) |
38 | :export ( | |
e9680547 MG |
39 | ;;; Constructors |
40 | ;; cons <= in the core | |
41 | ;; list <= in the core | |
42 | xcons | |
43 | ;; cons* <= in the core | |
44 | ;; make-list <= in the core | |
45 | list-tabulate | |
46 | ;; list-copy <= in the core | |
47 | circular-list | |
f595ccfe | 48 | ;; iota ; Extended. |
e9680547 MG |
49 | |
50 | ;;; Predicates | |
51 | proper-list? | |
52 | circular-list? | |
53 | dotted-list? | |
54 | ;; pair? <= in the core | |
55 | ;; null? <= in the core | |
56 | null-list? | |
57 | not-pair? | |
58 | list= | |
59 | ||
60 | ;;; Selectors | |
61 | ;; car <= in the core | |
62 | ;; cdr <= in the core | |
63 | ;; caar <= in the core | |
64 | ;; cadr <= in the core | |
65 | ;; cdar <= in the core | |
b8b0abf0 | 66 | o ;; cddr <= in the core |
e9680547 MG |
67 | ;; caaar <= in the core |
68 | ;; caadr <= in the core | |
69 | ;; cadar <= in the core | |
70 | ;; caddr <= in the core | |
71 | ;; cdaar <= in the core | |
72 | ;; cdadr <= in the core | |
73 | ;; cddar <= in the core | |
74 | ;; cdddr <= in the core | |
75 | ;; caaaar <= in the core | |
76 | ;; caaadr <= in the core | |
77 | ;; caadar <= in the core | |
78 | ;; caaddr <= in the core | |
79 | ;; cadaar <= in the core | |
80 | ;; cadadr <= in the core | |
81 | ;; caddar <= in the core | |
82 | ;; cadddr <= in the core | |
83 | ;; cdaaar <= in the core | |
84 | ;; cdaadr <= in the core | |
85 | ;; cdadar <= in the core | |
86 | ;; cdaddr <= in the core | |
87 | ;; cddaar <= in the core | |
88 | ;; cddadr <= in the core | |
89 | ;; cdddar <= in the core | |
90 | ;; cddddr <= in the core | |
91 | ;; list-ref <= in the core | |
92 | first | |
93 | second | |
94 | third | |
95 | fourth | |
96 | fifth | |
97 | sixth | |
98 | seventh | |
99 | eighth | |
100 | ninth | |
101 | tenth | |
102 | car+cdr | |
103 | take | |
104 | drop | |
105 | take-right | |
106 | drop-right | |
107 | take! | |
108 | drop-right! | |
109 | split-at | |
110 | split-at! | |
111 | last | |
112 | ;; last-pair <= in the core | |
113 | ||
114 | ;;; Miscelleneous: length, append, concatenate, reverse, zip & count | |
115 | ;; length <= in the core | |
116 | length+ | |
117 | ;; append <= in the core | |
118 | ;; append! <= in the core | |
119 | concatenate | |
120 | concatenate! | |
121 | ;; reverse <= in the core | |
122 | ;; reverse! <= in the core | |
123 | append-reverse | |
124 | append-reverse! | |
125 | zip | |
126 | unzip1 | |
127 | unzip2 | |
128 | unzip3 | |
129 | unzip4 | |
130 | unzip5 | |
131 | count | |
132 | ||
133 | ;;; Fold, unfold & map | |
134 | fold | |
135 | fold-right | |
136 | pair-fold | |
137 | pair-fold-right | |
138 | reduce | |
139 | reduce-right | |
140 | unfold | |
141 | unfold-right | |
f595ccfe MD |
142 | ;; map ; Extended. |
143 | ;; for-each ; Extended. | |
e9680547 MG |
144 | append-map |
145 | append-map! | |
146 | map! | |
f595ccfe | 147 | ;; map-in-order ; Extended. |
e9680547 MG |
148 | pair-for-each |
149 | filter-map | |
150 | ||
151 | ;;; Filtering & partitioning | |
c614a00b | 152 | ;; filter <= in the core |
e9680547 MG |
153 | partition |
154 | remove | |
c614a00b | 155 | ;; filter! <= in the core |
e9680547 MG |
156 | partition! |
157 | remove! | |
158 | ||
159 | ;;; Searching | |
160 | find | |
161 | find-tail | |
162 | take-while | |
163 | take-while! | |
164 | drop-while | |
165 | span | |
166 | span! | |
167 | break | |
168 | break! | |
169 | any | |
170 | every | |
f595ccfe MD |
171 | ;; list-index ; Extended. |
172 | ;; member ; Extended. | |
e9680547 MG |
173 | ;; memq <= in the core |
174 | ;; memv <= in the core | |
175 | ||
176 | ;;; Deletion | |
f595ccfe MD |
177 | ;; delete ; Extended. |
178 | ;; delete! ; Extended. | |
e9680547 MG |
179 | delete-duplicates |
180 | delete-duplicates! | |
181 | ||
182 | ;;; Association lists | |
f595ccfe | 183 | ;; assoc ; Extended. |
e9680547 MG |
184 | ;; assq <= in the core |
185 | ;; assv <= in the core | |
186 | alist-cons | |
187 | alist-copy | |
188 | alist-delete | |
189 | alist-delete! | |
190 | ||
191 | ;;; Set operations on lists | |
192 | lset<= | |
193 | lset= | |
194 | lset-adjoin | |
195 | lset-union | |
196 | lset-intersection | |
197 | lset-difference | |
198 | lset-xor | |
199 | lset-diff+intersection | |
200 | lset-union! | |
201 | lset-intersection! | |
202 | lset-difference! | |
203 | lset-xor! | |
204 | lset-diff+intersection! | |
205 | ||
206 | ;;; Primitive side-effects | |
207 | ;; set-car! <= in the core | |
208 | ;; set-cdr! <= in the core | |
209 | ) | |
b8b0abf0 MD |
210 | :re-export (cons list cons* make-list list-copy pair? null? |
211 | car cdr caar cadr cdar cddr | |
212 | caaar caadr cadar caddr cdaar cdadr cddar cdddr | |
213 | caaaar caaadr caadar caaddr cadaar cadadr caddar cadddr | |
214 | cdaaar cdaadr cdadar cdaddr cddaar cddadr cdddar cddddr | |
215 | list-ref last-pair length append append! reverse reverse! | |
216 | filter filter! memq memv assq assv set-car! set-cdr!) | |
f595ccfe MD |
217 | :replace (iota map for-each map-in-order list-index member |
218 | delete delete! assoc) | |
219 | ) | |
e9680547 MG |
220 | |
221 | (cond-expand-provide (current-module) '(srfi-1)) | |
222 | ||
ee6aac97 MD |
223 | ;; Load the compiled primitives from the shared library. |
224 | ;; | |
225 | (load-extension "libguile-srfi-srfi-1" "scm_init_srfi_1") | |
226 | ||
227 | ||
e9680547 MG |
228 | ;;; Constructors |
229 | ||
230 | (define (xcons d a) | |
231 | (cons a d)) | |
232 | ||
5753f02f GH |
233 | ;; internal helper, similar to (scsh utilities) check-arg. |
234 | (define (check-arg-type pred arg caller) | |
235 | (if (pred arg) | |
236 | arg | |
237 | (scm-error 'wrong-type-arg caller | |
238 | "Wrong type argument: ~S" (list arg) '()))) | |
239 | ||
240 | ;; the srfi spec doesn't seem to forbid inexact integers. | |
241 | (define (non-negative-integer? x) (and (integer? x) (>= x 0))) | |
242 | ||
e9680547 | 243 | (define (list-tabulate n init-proc) |
5753f02f | 244 | (check-arg-type non-negative-integer? n "list-tabulate") |
e9680547 | 245 | (let lp ((n n) (acc '())) |
018adcae | 246 | (if (<= n 0) |
e9680547 MG |
247 | acc |
248 | (lp (- n 1) (cons (init-proc (- n 1)) acc))))) | |
249 | ||
250 | (define (circular-list elt1 . rest) | |
251 | (let ((start (cons elt1 '()))) | |
252 | (let lp ((r rest) (p start)) | |
253 | (if (null? r) | |
254 | (begin | |
255 | (set-cdr! p start) | |
256 | start) | |
257 | (begin | |
258 | (set-cdr! p (cons (car r) '())) | |
259 | (lp (cdr r) (cdr p))))))) | |
260 | ||
261 | (define (iota count . rest) | |
5753f02f | 262 | (check-arg-type non-negative-integer? count "iota") |
e9680547 MG |
263 | (let ((start (if (pair? rest) (car rest) 0)) |
264 | (step (if (and (pair? rest) (pair? (cdr rest))) (cadr rest) 1))) | |
265 | (let lp ((n 0) (acc '())) | |
266 | (if (= n count) | |
267 | (reverse! acc) | |
268 | (lp (+ n 1) (cons (+ start (* n step)) acc)))))) | |
269 | ||
270 | ;;; Predicates | |
271 | ||
272 | (define (proper-list? x) | |
273 | (list? x)) | |
274 | ||
275 | (define (circular-list? x) | |
276 | (if (not-pair? x) | |
277 | #f | |
278 | (let lp ((hare (cdr x)) (tortoise x)) | |
279 | (if (not-pair? hare) | |
280 | #f | |
281 | (let ((hare (cdr hare))) | |
282 | (if (not-pair? hare) | |
283 | #f | |
284 | (if (eq? hare tortoise) | |
285 | #t | |
286 | (lp (cdr hare) (cdr tortoise))))))))) | |
287 | ||
288 | (define (dotted-list? x) | |
289 | (cond | |
290 | ((null? x) #f) | |
291 | ((not-pair? x) #t) | |
292 | (else | |
293 | (let lp ((hare (cdr x)) (tortoise x)) | |
294 | (cond | |
295 | ((null? hare) #f) | |
296 | ((not-pair? hare) #t) | |
297 | (else | |
298 | (let ((hare (cdr hare))) | |
513a3bd7 | 299 | (cond |
e9680547 MG |
300 | ((null? hare) #f) |
301 | ((not-pair? hare) #t) | |
302 | ((eq? hare tortoise) #f) | |
303 | (else | |
304 | (lp (cdr hare) (cdr tortoise))))))))))) | |
305 | ||
306 | (define (null-list? x) | |
307 | (cond | |
513a3bd7 | 308 | ((proper-list? x) |
e9680547 MG |
309 | (null? x)) |
310 | ((circular-list? x) | |
311 | #f) | |
312 | (else | |
313 | (error "not a proper list in null-list?")))) | |
314 | ||
315 | (define (not-pair? x) | |
316 | (not (pair? x))) | |
317 | ||
318 | (define (list= elt= . rest) | |
319 | (define (lists-equal a b) | |
320 | (let lp ((a a) (b b)) | |
321 | (cond ((null? a) | |
322 | (null? b)) | |
323 | ((null? b) | |
324 | #f) | |
325 | (else | |
326 | (and (elt= (car a) (car b)) | |
327 | (lp (cdr a) (cdr b))))))) | |
328 | (or (null? rest) | |
329 | (let ((first (car rest))) | |
330 | (let lp ((lists rest)) | |
331 | (or (null? lists) | |
332 | (and (lists-equal first (car lists)) | |
333 | (lp (cdr lists)))))))) | |
334 | ||
335 | ;;; Selectors | |
336 | ||
337 | (define first car) | |
338 | (define second cadr) | |
339 | (define third caddr) | |
340 | (define fourth cadddr) | |
341 | (define (fifth x) (car (cddddr x))) | |
342 | (define (sixth x) (cadr (cddddr x))) | |
343 | (define (seventh x) (caddr (cddddr x))) | |
344 | (define (eighth x) (cadddr (cddddr x))) | |
345 | (define (ninth x) (car (cddddr (cddddr x)))) | |
346 | (define (tenth x) (cadr (cddddr (cddddr x)))) | |
347 | ||
348 | (define (car+cdr x) (values (car x) (cdr x))) | |
349 | ||
350 | (define (take x i) | |
351 | (let lp ((n i) (l x) (acc '())) | |
e800aa04 | 352 | (if (<= n 0) |
e9680547 MG |
353 | (reverse! acc) |
354 | (lp (- n 1) (cdr l) (cons (car l) acc))))) | |
355 | (define (drop x i) | |
356 | (let lp ((n i) (l x)) | |
e800aa04 | 357 | (if (<= n 0) |
e9680547 MG |
358 | l |
359 | (lp (- n 1) (cdr l))))) | |
360 | (define (take-right flist i) | |
361 | (let lp ((n i) (l flist)) | |
e800aa04 | 362 | (if (<= n 0) |
e9680547 MG |
363 | (let lp0 ((s flist) (l l)) |
364 | (if (null? l) | |
365 | s | |
366 | (lp0 (cdr s) (cdr l)))) | |
367 | (lp (- n 1) (cdr l))))) | |
513a3bd7 | 368 | |
e9680547 MG |
369 | (define (drop-right flist i) |
370 | (let lp ((n i) (l flist)) | |
e800aa04 | 371 | (if (<= n 0) |
e9680547 MG |
372 | (let lp0 ((s flist) (l l) (acc '())) |
373 | (if (null? l) | |
374 | (reverse! acc) | |
375 | (lp0 (cdr s) (cdr l) (cons (car s) acc)))) | |
376 | (lp (- n 1) (cdr l))))) | |
377 | ||
378 | (define (take! x i) | |
e800aa04 | 379 | (if (<= i 0) |
e9680547 MG |
380 | '() |
381 | (let lp ((n (- i 1)) (l x)) | |
e800aa04 | 382 | (if (<= n 0) |
513a3bd7 | 383 | (begin |
e9680547 MG |
384 | (set-cdr! l '()) |
385 | x) | |
386 | (lp (- n 1) (cdr l)))))) | |
387 | ||
388 | (define (drop-right! flist i) | |
e800aa04 | 389 | (if (<= i 0) |
e9680547 MG |
390 | flist |
391 | (let lp ((n (+ i 1)) (l flist)) | |
e800aa04 | 392 | (if (<= n 0) |
e9680547 MG |
393 | (let lp0 ((s flist) (l l)) |
394 | (if (null? l) | |
395 | (begin | |
396 | (set-cdr! s '()) | |
397 | flist) | |
398 | (lp0 (cdr s) (cdr l)))) | |
399 | (if (null? l) | |
400 | '() | |
401 | (lp (- n 1) (cdr l))))))) | |
402 | ||
403 | (define (split-at x i) | |
404 | (let lp ((l x) (n i) (acc '())) | |
e800aa04 | 405 | (if (<= n 0) |
e9680547 MG |
406 | (values (reverse! acc) l) |
407 | (lp (cdr l) (- n 1) (cons (car l) acc))))) | |
408 | ||
409 | (define (split-at! x i) | |
e800aa04 | 410 | (if (<= i 0) |
e9680547 MG |
411 | (values '() x) |
412 | (let lp ((l x) (n (- i 1))) | |
e800aa04 | 413 | (if (<= n 0) |
e9680547 MG |
414 | (let ((tmp (cdr l))) |
415 | (set-cdr! l '()) | |
416 | (values x tmp)) | |
417 | (lp (cdr l) (- n 1)))))) | |
418 | ||
419 | (define (last pair) | |
420 | (car (last-pair pair))) | |
421 | ||
422 | ;;; Miscelleneous: length, append, concatenate, reverse, zip & count | |
423 | ||
424 | (define (length+ clist) | |
425 | (if (null? clist) | |
426 | 0 | |
427 | (let lp ((hare (cdr clist)) (tortoise clist) (l 1)) | |
428 | (if (null? hare) | |
429 | l | |
430 | (let ((hare (cdr hare))) | |
431 | (if (null? hare) | |
432 | (+ l 1) | |
433 | (if (eq? hare tortoise) | |
434 | #f | |
435 | (lp (cdr hare) (cdr tortoise) (+ l 2))))))))) | |
436 | ||
437 | (define (concatenate l-o-l) | |
438 | (let lp ((l l-o-l) (acc '())) | |
439 | (if (null? l) | |
440 | (reverse! acc) | |
441 | (let lp0 ((ll (car l)) (acc acc)) | |
442 | (if (null? ll) | |
443 | (lp (cdr l) acc) | |
444 | (lp0 (cdr ll) (cons (car ll) acc))))))) | |
445 | ||
446 | (define (concatenate! l-o-l) | |
447 | (let lp0 ((l-o-l l-o-l)) | |
448 | (cond | |
449 | ((null? l-o-l) | |
450 | '()) | |
451 | ((null? (car l-o-l)) | |
452 | (lp0 (cdr l-o-l))) | |
453 | (else | |
454 | (let ((result (car l-o-l)) (tail (last-pair (car l-o-l)))) | |
455 | (let lp ((l (cdr l-o-l)) (ntail tail)) | |
456 | (if (null? l) | |
457 | result | |
458 | (begin | |
459 | (set-cdr! ntail (car l)) | |
460 | (lp (cdr l) (last-pair ntail)))))))))) | |
513a3bd7 | 461 | |
e9680547 MG |
462 | |
463 | (define (append-reverse rev-head tail) | |
464 | (let lp ((l rev-head) (acc tail)) | |
465 | (if (null? l) | |
466 | acc | |
467 | (lp (cdr l) (cons (car l) acc))))) | |
468 | ||
469 | (define (append-reverse! rev-head tail) | |
470 | (append-reverse rev-head tail)) ; XXX:optimize | |
471 | ||
472 | (define (zip clist1 . rest) | |
473 | (let lp ((l (cons clist1 rest)) (acc '())) | |
474 | (if (any null? l) | |
475 | (reverse! acc) | |
cef248dd | 476 | (lp (map1 cdr l) (cons (map1 car l) acc))))) |
513a3bd7 | 477 | |
e9680547 MG |
478 | |
479 | (define (unzip1 l) | |
cef248dd | 480 | (map1 first l)) |
e9680547 | 481 | (define (unzip2 l) |
cef248dd | 482 | (values (map1 first l) (map1 second l))) |
e9680547 | 483 | (define (unzip3 l) |
cef248dd | 484 | (values (map1 first l) (map1 second l) (map1 third l))) |
e9680547 | 485 | (define (unzip4 l) |
cef248dd | 486 | (values (map1 first l) (map1 second l) (map1 third l) (map1 fourth l))) |
e9680547 | 487 | (define (unzip5 l) |
cef248dd MG |
488 | (values (map1 first l) (map1 second l) (map1 third l) (map1 fourth l) |
489 | (map1 fifth l))) | |
e9680547 MG |
490 | |
491 | (define (count pred clist1 . rest) | |
492 | (if (null? rest) | |
493 | (count1 pred clist1) | |
494 | (let lp ((lists (cons clist1 rest))) | |
495 | (cond ((any1 null? lists) | |
496 | 0) | |
497 | (else | |
cef248dd MG |
498 | (if (apply pred (map1 car lists)) |
499 | (+ 1 (lp (map1 cdr lists))) | |
500 | (lp (map1 cdr lists)))))))) | |
e9680547 MG |
501 | |
502 | (define (count1 pred clist) | |
e4cb30df TTN |
503 | (let lp ((result 0) (rest clist)) |
504 | (if (null? rest) | |
505 | result | |
506 | (if (pred (car rest)) | |
507 | (lp (+ 1 result) (cdr rest)) | |
508 | (lp result (cdr rest)))))) | |
e9680547 MG |
509 | |
510 | ;;; Fold, unfold & map | |
511 | ||
512 | (define (fold kons knil list1 . rest) | |
513 | (if (null? rest) | |
514 | (let f ((knil knil) (list1 list1)) | |
515 | (if (null? list1) | |
516 | knil | |
517 | (f (kons (car list1) knil) (cdr list1)))) | |
518 | (let f ((knil knil) (lists (cons list1 rest))) | |
519 | (if (any null? lists) | |
520 | knil | |
cef248dd MG |
521 | (let ((cars (map1 car lists)) |
522 | (cdrs (map1 cdr lists))) | |
563058ef | 523 | (f (apply kons (append! cars (list knil))) cdrs)))))) |
e9680547 MG |
524 | |
525 | (define (fold-right kons knil clist1 . rest) | |
526 | (if (null? rest) | |
527 | (let f ((list1 clist1)) | |
528 | (if (null? list1) | |
529 | knil | |
530 | (kons (car list1) (f (cdr list1))))) | |
531 | (let f ((lists (cons clist1 rest))) | |
532 | (if (any null? lists) | |
533 | knil | |
cef248dd | 534 | (apply kons (append! (map1 car lists) (list (f (map1 cdr lists))))))))) |
e9680547 MG |
535 | |
536 | (define (pair-fold kons knil clist1 . rest) | |
537 | (if (null? rest) | |
538 | (let f ((knil knil) (list1 clist1)) | |
539 | (if (null? list1) | |
540 | knil | |
541 | (let ((tail (cdr list1))) | |
542 | (f (kons list1 knil) tail)))) | |
543 | (let f ((knil knil) (lists (cons clist1 rest))) | |
544 | (if (any null? lists) | |
545 | knil | |
cef248dd | 546 | (let ((tails (map1 cdr lists))) |
563058ef | 547 | (f (apply kons (append! lists (list knil))) tails)))))) |
e9680547 MG |
548 | |
549 | ||
550 | (define (pair-fold-right kons knil clist1 . rest) | |
551 | (if (null? rest) | |
552 | (let f ((list1 clist1)) | |
553 | (if (null? list1) | |
554 | knil | |
555 | (kons list1 (f (cdr list1))))) | |
556 | (let f ((lists (cons clist1 rest))) | |
557 | (if (any null? lists) | |
558 | knil | |
cef248dd | 559 | (apply kons (append! lists (list (f (map1 cdr lists))))))))) |
e9680547 MG |
560 | |
561 | (define (unfold p f g seed . rest) | |
562 | (let ((tail-gen (if (pair? rest) | |
563 | (if (pair? (cdr rest)) | |
564 | (scm-error 'wrong-number-of-args | |
565 | "unfold" "too many arguments" '() '()) | |
566 | (car rest)) | |
567 | (lambda (x) '())))) | |
568 | (let uf ((seed seed)) | |
569 | (if (p seed) | |
570 | (tail-gen seed) | |
571 | (cons (f seed) | |
572 | (uf (g seed))))))) | |
573 | ||
574 | (define (unfold-right p f g seed . rest) | |
575 | (let ((tail (if (pair? rest) | |
576 | (if (pair? (cdr rest)) | |
577 | (scm-error 'wrong-number-of-args | |
578 | "unfold-right" "too many arguments" '() | |
579 | '()) | |
580 | (car rest)) | |
581 | '()))) | |
582 | (let uf ((seed seed) (lis tail)) | |
583 | (if (p seed) | |
584 | lis | |
585 | (uf (g seed) (cons (f seed) lis)))))) | |
586 | ||
587 | (define (reduce f ridentity lst) | |
588 | (fold f ridentity lst)) | |
589 | ||
590 | (define (reduce-right f ridentity lst) | |
591 | (fold-right f ridentity lst)) | |
592 | ||
cef248dd MG |
593 | |
594 | ;; Internal helper procedure. Map `f' over the single list `ls'. | |
595 | ;; | |
7692d26b | 596 | (define map1 map) |
cef248dd | 597 | |
e9680547 MG |
598 | (define (append-map f clist1 . rest) |
599 | (if (null? rest) | |
600 | (let lp ((l clist1)) | |
601 | (if (null? l) | |
602 | '() | |
603 | (append (f (car l)) (lp (cdr l))))) | |
604 | (let lp ((l (cons clist1 rest))) | |
605 | (if (any1 null? l) | |
606 | '() | |
cef248dd MG |
607 | (append (apply f (map1 car l)) (lp (map1 cdr l))))))) |
608 | ||
e9680547 MG |
609 | |
610 | (define (append-map! f clist1 . rest) | |
611 | (if (null? rest) | |
612 | (let lp ((l clist1)) | |
613 | (if (null? l) | |
614 | '() | |
615 | (append! (f (car l)) (lp (cdr l))))) | |
616 | (let lp ((l (cons clist1 rest))) | |
617 | (if (any1 null? l) | |
618 | '() | |
cef248dd | 619 | (append! (apply f (map1 car l)) (lp (map1 cdr l))))))) |
e9680547 MG |
620 | |
621 | (define (map! f list1 . rest) | |
622 | (if (null? rest) | |
623 | (let lp ((l list1)) | |
624 | (if (null? l) | |
625 | '() | |
626 | (begin | |
627 | (set-car! l (f (car l))) | |
628 | (set-cdr! l (lp (cdr l))) | |
629 | l))) | |
630 | (let lp ((l (cons list1 rest)) (res list1)) | |
631 | (if (any1 null? l) | |
632 | '() | |
633 | (begin | |
cef248dd MG |
634 | (set-car! res (apply f (map1 car l))) |
635 | (set-cdr! res (lp (map1 cdr l) (cdr res))) | |
e9680547 MG |
636 | res))))) |
637 | ||
638 | (define (pair-for-each f clist1 . rest) | |
639 | (if (null? rest) | |
640 | (let lp ((l clist1)) | |
641 | (if (null? l) | |
642 | (if #f #f) | |
643 | (begin | |
644 | (f l) | |
645 | (lp (cdr l))))) | |
646 | (let lp ((l (cons clist1 rest))) | |
647 | (if (any1 null? l) | |
648 | (if #f #f) | |
649 | (begin | |
650 | (apply f l) | |
cef248dd | 651 | (lp (map1 cdr l))))))) |
e9680547 MG |
652 | |
653 | (define (filter-map f clist1 . rest) | |
654 | (if (null? rest) | |
655 | (let lp ((l clist1)) | |
656 | (if (null? l) | |
657 | '() | |
658 | (let ((res (f (car l)))) | |
659 | (if res | |
660 | (cons res (lp (cdr l))) | |
661 | (lp (cdr l)))))) | |
662 | (let lp ((l (cons clist1 rest))) | |
663 | (if (any1 null? l) | |
664 | '() | |
cef248dd | 665 | (let ((res (apply f (map1 car l)))) |
e9680547 | 666 | (if res |
cef248dd MG |
667 | (cons res (lp (map1 cdr l))) |
668 | (lp (map1 cdr l)))))))) | |
e9680547 MG |
669 | |
670 | ;;; Filtering & partitioning | |
671 | ||
e9680547 MG |
672 | (define (partition pred list) |
673 | (if (null? list) | |
674 | (values '() '()) | |
675 | (if (pred (car list)) | |
676 | (receive (in out) (partition pred (cdr list)) | |
677 | (values (cons (car list) in) out)) | |
678 | (receive (in out) (partition pred (cdr list)) | |
679 | (values in (cons (car list) out)))))) | |
680 | ||
681 | (define (remove pred list) | |
848458d9 | 682 | (filter (lambda (x) (not (pred x))) list)) |
e9680547 | 683 | |
e9680547 MG |
684 | (define (partition! pred list) |
685 | (partition pred list)) ; XXX:optimize | |
686 | ||
687 | (define (remove! pred list) | |
688 | (remove pred list)) ; XXX:optimize | |
689 | ||
690 | ;;; Searching | |
691 | ||
692 | (define (find pred clist) | |
693 | (if (null? clist) | |
694 | #f | |
695 | (if (pred (car clist)) | |
696 | (car clist) | |
697 | (find pred (cdr clist))))) | |
698 | ||
699 | (define (find-tail pred clist) | |
700 | (if (null? clist) | |
701 | #f | |
702 | (if (pred (car clist)) | |
703 | clist | |
704 | (find-tail pred (cdr clist))))) | |
705 | ||
e4cb30df TTN |
706 | (define (take-while pred ls) |
707 | (cond ((null? ls) '()) | |
708 | ((not (pred (car ls))) '()) | |
709 | (else | |
710 | (let ((result (list (car ls)))) | |
711 | (let lp ((ls (cdr ls)) (p result)) | |
712 | (cond ((null? ls) result) | |
713 | ((not (pred (car ls))) result) | |
714 | (else | |
715 | (set-cdr! p (list (car ls))) | |
716 | (lp (cdr ls) (cdr p))))))))) | |
e9680547 MG |
717 | |
718 | (define (take-while! pred clist) | |
719 | (take-while pred clist)) ; XXX:optimize | |
720 | ||
721 | (define (drop-while pred clist) | |
722 | (if (null? clist) | |
723 | '() | |
724 | (if (pred (car clist)) | |
725 | (drop-while pred (cdr clist)) | |
726 | clist))) | |
727 | ||
728 | (define (span pred clist) | |
729 | (if (null? clist) | |
730 | (values '() '()) | |
731 | (if (pred (car clist)) | |
732 | (receive (first last) (span pred (cdr clist)) | |
733 | (values (cons (car clist) first) last)) | |
734 | (values '() clist)))) | |
735 | ||
736 | (define (span! pred list) | |
737 | (span pred list)) ; XXX:optimize | |
738 | ||
739 | (define (break pred clist) | |
740 | (if (null? clist) | |
741 | (values '() '()) | |
742 | (if (pred (car clist)) | |
743 | (values '() clist) | |
744 | (receive (first last) (break pred (cdr clist)) | |
745 | (values (cons (car clist) first) last))))) | |
746 | ||
747 | (define (break! pred list) | |
748 | (break pred list)) ; XXX:optimize | |
749 | ||
750 | (define (any pred ls . lists) | |
751 | (if (null? lists) | |
752 | (any1 pred ls) | |
753 | (let lp ((lists (cons ls lists))) | |
754 | (cond ((any1 null? lists) | |
755 | #f) | |
cef248dd MG |
756 | ((any1 null? (map1 cdr lists)) |
757 | (apply pred (map1 car lists))) | |
e9680547 | 758 | (else |
cef248dd | 759 | (or (apply pred (map1 car lists)) (lp (map1 cdr lists)))))))) |
e9680547 MG |
760 | |
761 | (define (any1 pred ls) | |
762 | (let lp ((ls ls)) | |
763 | (cond ((null? ls) | |
764 | #f) | |
765 | ((null? (cdr ls)) | |
766 | (pred (car ls))) | |
767 | (else | |
768 | (or (pred (car ls)) (lp (cdr ls))))))) | |
769 | ||
770 | (define (every pred ls . lists) | |
771 | (if (null? lists) | |
772 | (every1 pred ls) | |
773 | (let lp ((lists (cons ls lists))) | |
774 | (cond ((any1 null? lists) | |
775 | #t) | |
cef248dd MG |
776 | ((any1 null? (map1 cdr lists)) |
777 | (apply pred (map1 car lists))) | |
e9680547 | 778 | (else |
cef248dd | 779 | (and (apply pred (map1 car lists)) (lp (map1 cdr lists)))))))) |
e9680547 MG |
780 | |
781 | (define (every1 pred ls) | |
782 | (let lp ((ls ls)) | |
783 | (cond ((null? ls) | |
784 | #t) | |
785 | ((null? (cdr ls)) | |
786 | (pred (car ls))) | |
787 | (else | |
788 | (and (pred (car ls)) (lp (cdr ls))))))) | |
789 | ||
790 | (define (list-index pred clist1 . rest) | |
791 | (if (null? rest) | |
792 | (let lp ((l clist1) (i 0)) | |
793 | (if (null? l) | |
794 | #f | |
795 | (if (pred (car l)) | |
796 | i | |
797 | (lp (cdr l) (+ i 1))))) | |
798 | (let lp ((lists (cons clist1 rest)) (i 0)) | |
799 | (cond ((any1 null? lists) | |
800 | #f) | |
cef248dd | 801 | ((apply pred (map1 car lists)) i) |
e9680547 | 802 | (else |
cef248dd | 803 | (lp (map1 cdr lists) (+ i 1))))))) |
e9680547 | 804 | |
e9680547 MG |
805 | ;;; Deletion |
806 | ||
807 | (define (delete x list . rest) | |
808 | (let ((l= (if (pair? rest) (car rest) equal?))) | |
809 | (let lp ((l list)) | |
810 | (if (null? l) | |
811 | '() | |
812 | (if (l= (car l) x) | |
813 | (lp (cdr l)) | |
814 | (cons (car l) (lp (cdr l)))))))) | |
815 | ||
816 | (define (delete! x list . rest) | |
817 | (let ((l= (if (pair? rest) (car rest) equal?))) | |
818 | (delete x list l=))) ; XXX:optimize | |
819 | ||
820 | (define (delete-duplicates list . rest) | |
821 | (let ((l= (if (pair? rest) (car rest) equal?))) | |
822 | (let lp0 ((l1 list)) | |
823 | (if (null? l1) | |
824 | '() | |
825 | (if (let lp1 ((l2 (cdr l1))) | |
826 | (if (null? l2) | |
827 | #f | |
828 | (if (l= (car l1) (car l2)) | |
829 | #t | |
830 | (lp1 (cdr l2))))) | |
831 | (lp0 (cdr l1)) | |
563058ef MG |
832 | (cons (car l1) (lp0 (cdr l1)))))))) |
833 | ||
834 | (define (delete-duplicates list . rest) | |
835 | (let ((l= (if (pair? rest) (car rest) equal?))) | |
836 | (let lp ((list list)) | |
513a3bd7 | 837 | (if (null? list) |
563058ef MG |
838 | '() |
839 | (cons (car list) (lp (delete (car list) (cdr list) l=))))))) | |
e9680547 MG |
840 | |
841 | (define (delete-duplicates! list . rest) | |
842 | (let ((l= (if (pair? rest) (car rest) equal?))) | |
843 | (delete-duplicates list l=))) ; XXX:optimize | |
844 | ||
845 | ;;; Association lists | |
846 | ||
e9680547 MG |
847 | (define (alist-cons key datum alist) |
848 | (acons key datum alist)) | |
849 | ||
850 | (define (alist-copy alist) | |
851 | (let lp ((a alist)) | |
852 | (if (null? a) | |
853 | '() | |
563058ef | 854 | (acons (caar a) (cdar a) (lp (cdr a)))))) |
e9680547 MG |
855 | |
856 | (define (alist-delete key alist . rest) | |
857 | (let ((k= (if (pair? rest) (car rest) equal?))) | |
858 | (let lp ((a alist)) | |
859 | (if (null? a) | |
860 | '() | |
861 | (if (k= (caar a) key) | |
862 | (lp (cdr a)) | |
863 | (cons (car a) (lp (cdr a)))))))) | |
864 | ||
865 | (define (alist-delete! key alist . rest) | |
866 | (let ((k= (if (pair? rest) (car rest) equal?))) | |
867 | (alist-delete key alist k=))) ; XXX:optimize | |
868 | ||
869 | ;;; Set operations on lists | |
870 | ||
871 | (define (lset<= = . rest) | |
872 | (if (null? rest) | |
873 | #t | |
874 | (let lp ((f (car rest)) (r (cdr rest))) | |
875 | (or (null? r) | |
876 | (and (every (lambda (el) (member el (car r) =)) f) | |
877 | (lp (car r) (cdr r))))))) | |
878 | ||
879 | (define (lset= = list1 . rest) | |
880 | (if (null? rest) | |
881 | #t | |
882 | (let lp ((f list1) (r rest)) | |
883 | (or (null? r) | |
884 | (and (every (lambda (el) (member el (car r) =)) f) | |
885 | (every (lambda (el) (member el f =)) (car r)) | |
886 | (lp (car r) (cdr r))))))) | |
887 | ||
888 | (define (lset-adjoin = list . rest) | |
889 | (let lp ((l rest) (acc list)) | |
890 | (if (null? l) | |
891 | acc | |
892 | (if (member (car l) acc) | |
893 | (lp (cdr l) acc) | |
894 | (lp (cdr l) (cons (car l) acc)))))) | |
895 | ||
896 | (define (lset-union = . rest) | |
897 | (let lp0 ((l rest) (acc '())) | |
898 | (if (null? l) | |
899 | (reverse! acc) | |
900 | (let lp1 ((ll (car l)) (acc acc)) | |
901 | (if (null? ll) | |
902 | (lp0 (cdr l) acc) | |
903 | (if (member (car ll) acc =) | |
904 | (lp1 (cdr ll) acc) | |
905 | (lp1 (cdr ll) (cons (car ll) acc)))))))) | |
906 | ||
907 | (define (lset-intersection = list1 . rest) | |
908 | (let lp ((l list1) (acc '())) | |
909 | (if (null? l) | |
910 | (reverse! acc) | |
911 | (if (every (lambda (ll) (member (car l) ll =)) rest) | |
912 | (lp (cdr l) (cons (car l) acc)) | |
913 | (lp (cdr l) acc))))) | |
914 | ||
915 | (define (lset-difference = list1 . rest) | |
916 | (if (null? rest) | |
917 | list1 | |
918 | (let lp ((l list1) (acc '())) | |
919 | (if (null? l) | |
920 | (reverse! acc) | |
921 | (if (any (lambda (ll) (member (car l) ll =)) rest) | |
922 | (lp (cdr l) acc) | |
923 | (lp (cdr l) (cons (car l) acc))))))) | |
924 | ||
925 | ;(define (fold kons knil list1 . rest) | |
926 | ||
927 | (define (lset-xor = . rest) | |
928 | (fold (lambda (lst res) | |
929 | (let lp ((l lst) (acc '())) | |
930 | (if (null? l) | |
931 | (let lp0 ((r res) (acc acc)) | |
932 | (if (null? r) | |
933 | (reverse! acc) | |
934 | (if (member (car r) lst =) | |
935 | (lp0 (cdr r) acc) | |
936 | (lp0 (cdr r) (cons (car r) acc))))) | |
937 | (if (member (car l) res =) | |
938 | (lp (cdr l) acc) | |
939 | (lp (cdr l) (cons (car l) acc)))))) | |
940 | '() | |
941 | rest)) | |
942 | ||
943 | (define (lset-diff+intersection = list1 . rest) | |
944 | (let lp ((l list1) (accd '()) (acci '())) | |
945 | (if (null? l) | |
946 | (values (reverse! accd) (reverse! acci)) | |
947 | (let ((appears (every (lambda (ll) (member (car l) ll =)) rest))) | |
948 | (if appears | |
949 | (lp (cdr l) accd (cons (car l) acci)) | |
950 | (lp (cdr l) (cons (car l) accd) acci)))))) | |
951 | ||
952 | ||
953 | (define (lset-union! = . rest) | |
954 | (apply lset-union = rest)) ; XXX:optimize | |
955 | ||
956 | (define (lset-intersection! = list1 . rest) | |
957 | (apply lset-intersection = list1 rest)) ; XXX:optimize | |
958 | ||
959 | (define (lset-difference! = list1 . rest) | |
960 | (apply lset-difference = list1 rest)) ; XXX:optimize | |
961 | ||
962 | (define (lset-xor! = . rest) | |
963 | (apply lset-xor = rest)) ; XXX:optimize | |
964 | ||
965 | (define (lset-diff+intersection! = list1 . rest) | |
966 | (apply lset-diff+intersection = list1 rest)) ; XXX:optimize | |
6be07c52 TTN |
967 | |
968 | ;;; srfi-1.scm ends here |