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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 TTN |
4 | ;; |
5 | ;; This program is free software; you can redistribute it and/or | |
6 | ;; modify it under the terms of the GNU General Public License as | |
7 | ;; published by the Free Software Foundation; either version 2, or | |
8 | ;; (at your option) any later version. | |
9 | ;; | |
10 | ;; This program is distributed in the hope that it will be useful, | |
11 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | ;; General Public License for more details. | |
14 | ;; | |
15 | ;; You should have received a copy of the GNU General Public License | |
16 | ;; along with this software; see the file COPYING. If not, write to | |
17 | ;; the Free Software Foundation, Inc., 59 Temple Place, Suite 330, | |
18 | ;; Boston, MA 02111-1307 USA | |
19 | ;; | |
20 | ;; As a special exception, the Free Software Foundation gives permission | |
21 | ;; for additional uses of the text contained in its release of GUILE. | |
22 | ;; | |
23 | ;; The exception is that, if you link the GUILE library with other files | |
24 | ;; to produce an executable, this does not by itself cause the | |
25 | ;; resulting executable to be covered by the GNU General Public License. | |
26 | ;; Your use of that executable is in no way restricted on account of | |
27 | ;; linking the GUILE library code into it. | |
28 | ;; | |
29 | ;; This exception does not however invalidate any other reasons why | |
30 | ;; the executable file might be covered by the GNU General Public License. | |
31 | ;; | |
32 | ;; This exception applies only to the code released by the | |
33 | ;; Free Software Foundation under the name GUILE. If you copy | |
34 | ;; code from other Free Software Foundation releases into a copy of | |
35 | ;; GUILE, as the General Public License permits, the exception does | |
36 | ;; not apply to the code that you add in this way. To avoid misleading | |
37 | ;; anyone as to the status of such modified files, you must delete | |
38 | ;; this exception notice from them. | |
39 | ;; | |
40 | ;; If you write modifications of your own for GUILE, it is your choice | |
41 | ;; whether to permit this exception to apply to your modifications. | |
42 | ;; If you do not wish that, delete this exception notice. | |
e9680547 MG |
43 | |
44 | ;;; Author: Martin Grabmueller <mgrabmue@cs.tu-berlin.de> | |
45 | ;;; Date: 2001-06-06 | |
46 | ||
47 | ;;; Commentary: | |
48 | ||
6be07c52 TTN |
49 | ;; This is an implementation of SRFI-1 (List Library). |
50 | ;; | |
51 | ;; All procedures defined in SRFI-1, which are not already defined in | |
52 | ;; the Guile core library, are exported. The procedures in this | |
53 | ;; implementation work, but they have not been tuned for speed or | |
54 | ;; memory usage. | |
55 | ;; | |
56 | ;; This module is fully documented in the Guile Reference Manual. | |
e9680547 MG |
57 | |
58 | ;;; Code: | |
59 | ||
60 | (define-module (srfi srfi-1) | |
563058ef | 61 | :use-module (ice-9 session) |
f595ccfe MD |
62 | :use-module (ice-9 receive) |
63 | :export ( | |
e9680547 MG |
64 | ;;; Constructors |
65 | ;; cons <= in the core | |
66 | ;; list <= in the core | |
67 | xcons | |
68 | ;; cons* <= in the core | |
69 | ;; make-list <= in the core | |
70 | list-tabulate | |
71 | ;; list-copy <= in the core | |
72 | circular-list | |
f595ccfe | 73 | ;; iota ; Extended. |
e9680547 MG |
74 | |
75 | ;;; Predicates | |
76 | proper-list? | |
77 | circular-list? | |
78 | dotted-list? | |
79 | ;; pair? <= in the core | |
80 | ;; null? <= in the core | |
81 | null-list? | |
82 | not-pair? | |
83 | list= | |
84 | ||
85 | ;;; Selectors | |
86 | ;; car <= in the core | |
87 | ;; cdr <= in the core | |
88 | ;; caar <= in the core | |
89 | ;; cadr <= in the core | |
90 | ;; cdar <= in the core | |
91 | ;; cddr <= in the core | |
92 | ;; caaar <= in the core | |
93 | ;; caadr <= in the core | |
94 | ;; cadar <= in the core | |
95 | ;; caddr <= in the core | |
96 | ;; cdaar <= in the core | |
97 | ;; cdadr <= in the core | |
98 | ;; cddar <= in the core | |
99 | ;; cdddr <= in the core | |
100 | ;; caaaar <= in the core | |
101 | ;; caaadr <= in the core | |
102 | ;; caadar <= in the core | |
103 | ;; caaddr <= in the core | |
104 | ;; cadaar <= in the core | |
105 | ;; cadadr <= in the core | |
106 | ;; caddar <= in the core | |
107 | ;; cadddr <= in the core | |
108 | ;; cdaaar <= in the core | |
109 | ;; cdaadr <= in the core | |
110 | ;; cdadar <= in the core | |
111 | ;; cdaddr <= in the core | |
112 | ;; cddaar <= in the core | |
113 | ;; cddadr <= in the core | |
114 | ;; cdddar <= in the core | |
115 | ;; cddddr <= in the core | |
116 | ;; list-ref <= in the core | |
117 | first | |
118 | second | |
119 | third | |
120 | fourth | |
121 | fifth | |
122 | sixth | |
123 | seventh | |
124 | eighth | |
125 | ninth | |
126 | tenth | |
127 | car+cdr | |
128 | take | |
129 | drop | |
130 | take-right | |
131 | drop-right | |
132 | take! | |
133 | drop-right! | |
134 | split-at | |
135 | split-at! | |
136 | last | |
137 | ;; last-pair <= in the core | |
138 | ||
139 | ;;; Miscelleneous: length, append, concatenate, reverse, zip & count | |
140 | ;; length <= in the core | |
141 | length+ | |
142 | ;; append <= in the core | |
143 | ;; append! <= in the core | |
144 | concatenate | |
145 | concatenate! | |
146 | ;; reverse <= in the core | |
147 | ;; reverse! <= in the core | |
148 | append-reverse | |
149 | append-reverse! | |
150 | zip | |
151 | unzip1 | |
152 | unzip2 | |
153 | unzip3 | |
154 | unzip4 | |
155 | unzip5 | |
156 | count | |
157 | ||
158 | ;;; Fold, unfold & map | |
159 | fold | |
160 | fold-right | |
161 | pair-fold | |
162 | pair-fold-right | |
163 | reduce | |
164 | reduce-right | |
165 | unfold | |
166 | unfold-right | |
f595ccfe MD |
167 | ;; map ; Extended. |
168 | ;; for-each ; Extended. | |
e9680547 MG |
169 | append-map |
170 | append-map! | |
171 | map! | |
f595ccfe | 172 | ;; map-in-order ; Extended. |
e9680547 MG |
173 | pair-for-each |
174 | filter-map | |
175 | ||
176 | ;;; Filtering & partitioning | |
177 | filter | |
178 | partition | |
179 | remove | |
180 | filter! | |
181 | partition! | |
182 | remove! | |
183 | ||
184 | ;;; Searching | |
185 | find | |
186 | find-tail | |
187 | take-while | |
188 | take-while! | |
189 | drop-while | |
190 | span | |
191 | span! | |
192 | break | |
193 | break! | |
194 | any | |
195 | every | |
f595ccfe MD |
196 | ;; list-index ; Extended. |
197 | ;; member ; Extended. | |
e9680547 MG |
198 | ;; memq <= in the core |
199 | ;; memv <= in the core | |
200 | ||
201 | ;;; Deletion | |
f595ccfe MD |
202 | ;; delete ; Extended. |
203 | ;; delete! ; Extended. | |
e9680547 MG |
204 | delete-duplicates |
205 | delete-duplicates! | |
206 | ||
207 | ;;; Association lists | |
f595ccfe | 208 | ;; assoc ; Extended. |
e9680547 MG |
209 | ;; assq <= in the core |
210 | ;; assv <= in the core | |
211 | alist-cons | |
212 | alist-copy | |
213 | alist-delete | |
214 | alist-delete! | |
215 | ||
216 | ;;; Set operations on lists | |
217 | lset<= | |
218 | lset= | |
219 | lset-adjoin | |
220 | lset-union | |
221 | lset-intersection | |
222 | lset-difference | |
223 | lset-xor | |
224 | lset-diff+intersection | |
225 | lset-union! | |
226 | lset-intersection! | |
227 | lset-difference! | |
228 | lset-xor! | |
229 | lset-diff+intersection! | |
230 | ||
231 | ;;; Primitive side-effects | |
232 | ;; set-car! <= in the core | |
233 | ;; set-cdr! <= in the core | |
234 | ) | |
f595ccfe MD |
235 | :replace (iota map for-each map-in-order list-index member |
236 | delete delete! assoc) | |
237 | ) | |
e9680547 MG |
238 | |
239 | (cond-expand-provide (current-module) '(srfi-1)) | |
240 | ||
ee6aac97 MD |
241 | ;; Load the compiled primitives from the shared library. |
242 | ;; | |
243 | (load-extension "libguile-srfi-srfi-1" "scm_init_srfi_1") | |
244 | ||
245 | ||
e9680547 MG |
246 | ;;; Constructors |
247 | ||
248 | (define (xcons d a) | |
249 | (cons a d)) | |
250 | ||
5753f02f GH |
251 | ;; internal helper, similar to (scsh utilities) check-arg. |
252 | (define (check-arg-type pred arg caller) | |
253 | (if (pred arg) | |
254 | arg | |
255 | (scm-error 'wrong-type-arg caller | |
256 | "Wrong type argument: ~S" (list arg) '()))) | |
257 | ||
258 | ;; the srfi spec doesn't seem to forbid inexact integers. | |
259 | (define (non-negative-integer? x) (and (integer? x) (>= x 0))) | |
260 | ||
e9680547 | 261 | (define (list-tabulate n init-proc) |
5753f02f | 262 | (check-arg-type non-negative-integer? n "list-tabulate") |
e9680547 | 263 | (let lp ((n n) (acc '())) |
018adcae | 264 | (if (<= n 0) |
e9680547 MG |
265 | acc |
266 | (lp (- n 1) (cons (init-proc (- n 1)) acc))))) | |
267 | ||
268 | (define (circular-list elt1 . rest) | |
269 | (let ((start (cons elt1 '()))) | |
270 | (let lp ((r rest) (p start)) | |
271 | (if (null? r) | |
272 | (begin | |
273 | (set-cdr! p start) | |
274 | start) | |
275 | (begin | |
276 | (set-cdr! p (cons (car r) '())) | |
277 | (lp (cdr r) (cdr p))))))) | |
278 | ||
279 | (define (iota count . rest) | |
5753f02f | 280 | (check-arg-type non-negative-integer? count "iota") |
e9680547 MG |
281 | (let ((start (if (pair? rest) (car rest) 0)) |
282 | (step (if (and (pair? rest) (pair? (cdr rest))) (cadr rest) 1))) | |
283 | (let lp ((n 0) (acc '())) | |
284 | (if (= n count) | |
285 | (reverse! acc) | |
286 | (lp (+ n 1) (cons (+ start (* n step)) acc)))))) | |
287 | ||
288 | ;;; Predicates | |
289 | ||
290 | (define (proper-list? x) | |
291 | (list? x)) | |
292 | ||
293 | (define (circular-list? x) | |
294 | (if (not-pair? x) | |
295 | #f | |
296 | (let lp ((hare (cdr x)) (tortoise x)) | |
297 | (if (not-pair? hare) | |
298 | #f | |
299 | (let ((hare (cdr hare))) | |
300 | (if (not-pair? hare) | |
301 | #f | |
302 | (if (eq? hare tortoise) | |
303 | #t | |
304 | (lp (cdr hare) (cdr tortoise))))))))) | |
305 | ||
306 | (define (dotted-list? x) | |
307 | (cond | |
308 | ((null? x) #f) | |
309 | ((not-pair? x) #t) | |
310 | (else | |
311 | (let lp ((hare (cdr x)) (tortoise x)) | |
312 | (cond | |
313 | ((null? hare) #f) | |
314 | ((not-pair? hare) #t) | |
315 | (else | |
316 | (let ((hare (cdr hare))) | |
513a3bd7 | 317 | (cond |
e9680547 MG |
318 | ((null? hare) #f) |
319 | ((not-pair? hare) #t) | |
320 | ((eq? hare tortoise) #f) | |
321 | (else | |
322 | (lp (cdr hare) (cdr tortoise))))))))))) | |
323 | ||
324 | (define (null-list? x) | |
325 | (cond | |
513a3bd7 | 326 | ((proper-list? x) |
e9680547 MG |
327 | (null? x)) |
328 | ((circular-list? x) | |
329 | #f) | |
330 | (else | |
331 | (error "not a proper list in null-list?")))) | |
332 | ||
333 | (define (not-pair? x) | |
334 | (not (pair? x))) | |
335 | ||
336 | (define (list= elt= . rest) | |
337 | (define (lists-equal a b) | |
338 | (let lp ((a a) (b b)) | |
339 | (cond ((null? a) | |
340 | (null? b)) | |
341 | ((null? b) | |
342 | #f) | |
343 | (else | |
344 | (and (elt= (car a) (car b)) | |
345 | (lp (cdr a) (cdr b))))))) | |
346 | (or (null? rest) | |
347 | (let ((first (car rest))) | |
348 | (let lp ((lists rest)) | |
349 | (or (null? lists) | |
350 | (and (lists-equal first (car lists)) | |
351 | (lp (cdr lists)))))))) | |
352 | ||
353 | ;;; Selectors | |
354 | ||
355 | (define first car) | |
356 | (define second cadr) | |
357 | (define third caddr) | |
358 | (define fourth cadddr) | |
359 | (define (fifth x) (car (cddddr x))) | |
360 | (define (sixth x) (cadr (cddddr x))) | |
361 | (define (seventh x) (caddr (cddddr x))) | |
362 | (define (eighth x) (cadddr (cddddr x))) | |
363 | (define (ninth x) (car (cddddr (cddddr x)))) | |
364 | (define (tenth x) (cadr (cddddr (cddddr x)))) | |
365 | ||
366 | (define (car+cdr x) (values (car x) (cdr x))) | |
367 | ||
368 | (define (take x i) | |
369 | (let lp ((n i) (l x) (acc '())) | |
e800aa04 | 370 | (if (<= n 0) |
e9680547 MG |
371 | (reverse! acc) |
372 | (lp (- n 1) (cdr l) (cons (car l) acc))))) | |
373 | (define (drop x i) | |
374 | (let lp ((n i) (l x)) | |
e800aa04 | 375 | (if (<= n 0) |
e9680547 MG |
376 | l |
377 | (lp (- n 1) (cdr l))))) | |
378 | (define (take-right flist i) | |
379 | (let lp ((n i) (l flist)) | |
e800aa04 | 380 | (if (<= n 0) |
e9680547 MG |
381 | (let lp0 ((s flist) (l l)) |
382 | (if (null? l) | |
383 | s | |
384 | (lp0 (cdr s) (cdr l)))) | |
385 | (lp (- n 1) (cdr l))))) | |
513a3bd7 | 386 | |
e9680547 MG |
387 | (define (drop-right flist i) |
388 | (let lp ((n i) (l flist)) | |
e800aa04 | 389 | (if (<= n 0) |
e9680547 MG |
390 | (let lp0 ((s flist) (l l) (acc '())) |
391 | (if (null? l) | |
392 | (reverse! acc) | |
393 | (lp0 (cdr s) (cdr l) (cons (car s) acc)))) | |
394 | (lp (- n 1) (cdr l))))) | |
395 | ||
396 | (define (take! x i) | |
e800aa04 | 397 | (if (<= i 0) |
e9680547 MG |
398 | '() |
399 | (let lp ((n (- i 1)) (l x)) | |
e800aa04 | 400 | (if (<= n 0) |
513a3bd7 | 401 | (begin |
e9680547 MG |
402 | (set-cdr! l '()) |
403 | x) | |
404 | (lp (- n 1) (cdr l)))))) | |
405 | ||
406 | (define (drop-right! flist i) | |
e800aa04 | 407 | (if (<= i 0) |
e9680547 MG |
408 | flist |
409 | (let lp ((n (+ i 1)) (l flist)) | |
e800aa04 | 410 | (if (<= n 0) |
e9680547 MG |
411 | (let lp0 ((s flist) (l l)) |
412 | (if (null? l) | |
413 | (begin | |
414 | (set-cdr! s '()) | |
415 | flist) | |
416 | (lp0 (cdr s) (cdr l)))) | |
417 | (if (null? l) | |
418 | '() | |
419 | (lp (- n 1) (cdr l))))))) | |
420 | ||
421 | (define (split-at x i) | |
422 | (let lp ((l x) (n i) (acc '())) | |
e800aa04 | 423 | (if (<= n 0) |
e9680547 MG |
424 | (values (reverse! acc) l) |
425 | (lp (cdr l) (- n 1) (cons (car l) acc))))) | |
426 | ||
427 | (define (split-at! x i) | |
e800aa04 | 428 | (if (<= i 0) |
e9680547 MG |
429 | (values '() x) |
430 | (let lp ((l x) (n (- i 1))) | |
e800aa04 | 431 | (if (<= n 0) |
e9680547 MG |
432 | (let ((tmp (cdr l))) |
433 | (set-cdr! l '()) | |
434 | (values x tmp)) | |
435 | (lp (cdr l) (- n 1)))))) | |
436 | ||
437 | (define (last pair) | |
438 | (car (last-pair pair))) | |
439 | ||
440 | ;;; Miscelleneous: length, append, concatenate, reverse, zip & count | |
441 | ||
442 | (define (length+ clist) | |
443 | (if (null? clist) | |
444 | 0 | |
445 | (let lp ((hare (cdr clist)) (tortoise clist) (l 1)) | |
446 | (if (null? hare) | |
447 | l | |
448 | (let ((hare (cdr hare))) | |
449 | (if (null? hare) | |
450 | (+ l 1) | |
451 | (if (eq? hare tortoise) | |
452 | #f | |
453 | (lp (cdr hare) (cdr tortoise) (+ l 2))))))))) | |
454 | ||
455 | (define (concatenate l-o-l) | |
456 | (let lp ((l l-o-l) (acc '())) | |
457 | (if (null? l) | |
458 | (reverse! acc) | |
459 | (let lp0 ((ll (car l)) (acc acc)) | |
460 | (if (null? ll) | |
461 | (lp (cdr l) acc) | |
462 | (lp0 (cdr ll) (cons (car ll) acc))))))) | |
463 | ||
464 | (define (concatenate! l-o-l) | |
465 | (let lp0 ((l-o-l l-o-l)) | |
466 | (cond | |
467 | ((null? l-o-l) | |
468 | '()) | |
469 | ((null? (car l-o-l)) | |
470 | (lp0 (cdr l-o-l))) | |
471 | (else | |
472 | (let ((result (car l-o-l)) (tail (last-pair (car l-o-l)))) | |
473 | (let lp ((l (cdr l-o-l)) (ntail tail)) | |
474 | (if (null? l) | |
475 | result | |
476 | (begin | |
477 | (set-cdr! ntail (car l)) | |
478 | (lp (cdr l) (last-pair ntail)))))))))) | |
513a3bd7 | 479 | |
e9680547 MG |
480 | |
481 | (define (append-reverse rev-head tail) | |
482 | (let lp ((l rev-head) (acc tail)) | |
483 | (if (null? l) | |
484 | acc | |
485 | (lp (cdr l) (cons (car l) acc))))) | |
486 | ||
487 | (define (append-reverse! rev-head tail) | |
488 | (append-reverse rev-head tail)) ; XXX:optimize | |
489 | ||
490 | (define (zip clist1 . rest) | |
491 | (let lp ((l (cons clist1 rest)) (acc '())) | |
492 | (if (any null? l) | |
493 | (reverse! acc) | |
cef248dd | 494 | (lp (map1 cdr l) (cons (map1 car l) acc))))) |
513a3bd7 | 495 | |
e9680547 MG |
496 | |
497 | (define (unzip1 l) | |
cef248dd | 498 | (map1 first l)) |
e9680547 | 499 | (define (unzip2 l) |
cef248dd | 500 | (values (map1 first l) (map1 second l))) |
e9680547 | 501 | (define (unzip3 l) |
cef248dd | 502 | (values (map1 first l) (map1 second l) (map1 third l))) |
e9680547 | 503 | (define (unzip4 l) |
cef248dd | 504 | (values (map1 first l) (map1 second l) (map1 third l) (map1 fourth l))) |
e9680547 | 505 | (define (unzip5 l) |
cef248dd MG |
506 | (values (map1 first l) (map1 second l) (map1 third l) (map1 fourth l) |
507 | (map1 fifth l))) | |
e9680547 MG |
508 | |
509 | (define (count pred clist1 . rest) | |
510 | (if (null? rest) | |
511 | (count1 pred clist1) | |
512 | (let lp ((lists (cons clist1 rest))) | |
513 | (cond ((any1 null? lists) | |
514 | 0) | |
515 | (else | |
cef248dd MG |
516 | (if (apply pred (map1 car lists)) |
517 | (+ 1 (lp (map1 cdr lists))) | |
518 | (lp (map1 cdr lists)))))))) | |
e9680547 MG |
519 | |
520 | (define (count1 pred clist) | |
e4cb30df TTN |
521 | (let lp ((result 0) (rest clist)) |
522 | (if (null? rest) | |
523 | result | |
524 | (if (pred (car rest)) | |
525 | (lp (+ 1 result) (cdr rest)) | |
526 | (lp result (cdr rest)))))) | |
e9680547 MG |
527 | |
528 | ;;; Fold, unfold & map | |
529 | ||
530 | (define (fold kons knil list1 . rest) | |
531 | (if (null? rest) | |
532 | (let f ((knil knil) (list1 list1)) | |
533 | (if (null? list1) | |
534 | knil | |
535 | (f (kons (car list1) knil) (cdr list1)))) | |
536 | (let f ((knil knil) (lists (cons list1 rest))) | |
537 | (if (any null? lists) | |
538 | knil | |
cef248dd MG |
539 | (let ((cars (map1 car lists)) |
540 | (cdrs (map1 cdr lists))) | |
563058ef | 541 | (f (apply kons (append! cars (list knil))) cdrs)))))) |
e9680547 MG |
542 | |
543 | (define (fold-right kons knil clist1 . rest) | |
544 | (if (null? rest) | |
545 | (let f ((list1 clist1)) | |
546 | (if (null? list1) | |
547 | knil | |
548 | (kons (car list1) (f (cdr list1))))) | |
549 | (let f ((lists (cons clist1 rest))) | |
550 | (if (any null? lists) | |
551 | knil | |
cef248dd | 552 | (apply kons (append! (map1 car lists) (list (f (map1 cdr lists))))))))) |
e9680547 MG |
553 | |
554 | (define (pair-fold kons knil clist1 . rest) | |
555 | (if (null? rest) | |
556 | (let f ((knil knil) (list1 clist1)) | |
557 | (if (null? list1) | |
558 | knil | |
559 | (let ((tail (cdr list1))) | |
560 | (f (kons list1 knil) tail)))) | |
561 | (let f ((knil knil) (lists (cons clist1 rest))) | |
562 | (if (any null? lists) | |
563 | knil | |
cef248dd | 564 | (let ((tails (map1 cdr lists))) |
563058ef | 565 | (f (apply kons (append! lists (list knil))) tails)))))) |
e9680547 MG |
566 | |
567 | ||
568 | (define (pair-fold-right kons knil clist1 . rest) | |
569 | (if (null? rest) | |
570 | (let f ((list1 clist1)) | |
571 | (if (null? list1) | |
572 | knil | |
573 | (kons list1 (f (cdr list1))))) | |
574 | (let f ((lists (cons clist1 rest))) | |
575 | (if (any null? lists) | |
576 | knil | |
cef248dd | 577 | (apply kons (append! lists (list (f (map1 cdr lists))))))))) |
e9680547 MG |
578 | |
579 | (define (unfold p f g seed . rest) | |
580 | (let ((tail-gen (if (pair? rest) | |
581 | (if (pair? (cdr rest)) | |
582 | (scm-error 'wrong-number-of-args | |
583 | "unfold" "too many arguments" '() '()) | |
584 | (car rest)) | |
585 | (lambda (x) '())))) | |
586 | (let uf ((seed seed)) | |
587 | (if (p seed) | |
588 | (tail-gen seed) | |
589 | (cons (f seed) | |
590 | (uf (g seed))))))) | |
591 | ||
592 | (define (unfold-right p f g seed . rest) | |
593 | (let ((tail (if (pair? rest) | |
594 | (if (pair? (cdr rest)) | |
595 | (scm-error 'wrong-number-of-args | |
596 | "unfold-right" "too many arguments" '() | |
597 | '()) | |
598 | (car rest)) | |
599 | '()))) | |
600 | (let uf ((seed seed) (lis tail)) | |
601 | (if (p seed) | |
602 | lis | |
603 | (uf (g seed) (cons (f seed) lis)))))) | |
604 | ||
605 | (define (reduce f ridentity lst) | |
606 | (fold f ridentity lst)) | |
607 | ||
608 | (define (reduce-right f ridentity lst) | |
609 | (fold-right f ridentity lst)) | |
610 | ||
cef248dd MG |
611 | |
612 | ;; Internal helper procedure. Map `f' over the single list `ls'. | |
613 | ;; | |
7692d26b | 614 | (define map1 map) |
cef248dd | 615 | |
e9680547 MG |
616 | (define (append-map f clist1 . rest) |
617 | (if (null? rest) | |
618 | (let lp ((l clist1)) | |
619 | (if (null? l) | |
620 | '() | |
621 | (append (f (car l)) (lp (cdr l))))) | |
622 | (let lp ((l (cons clist1 rest))) | |
623 | (if (any1 null? l) | |
624 | '() | |
cef248dd MG |
625 | (append (apply f (map1 car l)) (lp (map1 cdr l))))))) |
626 | ||
e9680547 MG |
627 | |
628 | (define (append-map! f clist1 . rest) | |
629 | (if (null? rest) | |
630 | (let lp ((l clist1)) | |
631 | (if (null? l) | |
632 | '() | |
633 | (append! (f (car l)) (lp (cdr l))))) | |
634 | (let lp ((l (cons clist1 rest))) | |
635 | (if (any1 null? l) | |
636 | '() | |
cef248dd | 637 | (append! (apply f (map1 car l)) (lp (map1 cdr l))))))) |
e9680547 MG |
638 | |
639 | (define (map! f list1 . rest) | |
640 | (if (null? rest) | |
641 | (let lp ((l list1)) | |
642 | (if (null? l) | |
643 | '() | |
644 | (begin | |
645 | (set-car! l (f (car l))) | |
646 | (set-cdr! l (lp (cdr l))) | |
647 | l))) | |
648 | (let lp ((l (cons list1 rest)) (res list1)) | |
649 | (if (any1 null? l) | |
650 | '() | |
651 | (begin | |
cef248dd MG |
652 | (set-car! res (apply f (map1 car l))) |
653 | (set-cdr! res (lp (map1 cdr l) (cdr res))) | |
e9680547 MG |
654 | res))))) |
655 | ||
656 | (define (pair-for-each f clist1 . rest) | |
657 | (if (null? rest) | |
658 | (let lp ((l clist1)) | |
659 | (if (null? l) | |
660 | (if #f #f) | |
661 | (begin | |
662 | (f l) | |
663 | (lp (cdr l))))) | |
664 | (let lp ((l (cons clist1 rest))) | |
665 | (if (any1 null? l) | |
666 | (if #f #f) | |
667 | (begin | |
668 | (apply f l) | |
cef248dd | 669 | (lp (map1 cdr l))))))) |
e9680547 MG |
670 | |
671 | (define (filter-map f clist1 . rest) | |
672 | (if (null? rest) | |
673 | (let lp ((l clist1)) | |
674 | (if (null? l) | |
675 | '() | |
676 | (let ((res (f (car l)))) | |
677 | (if res | |
678 | (cons res (lp (cdr l))) | |
679 | (lp (cdr l)))))) | |
680 | (let lp ((l (cons clist1 rest))) | |
681 | (if (any1 null? l) | |
682 | '() | |
cef248dd | 683 | (let ((res (apply f (map1 car l)))) |
e9680547 | 684 | (if res |
cef248dd MG |
685 | (cons res (lp (map1 cdr l))) |
686 | (lp (map1 cdr l)))))))) | |
e9680547 MG |
687 | |
688 | ;;; Filtering & partitioning | |
689 | ||
690 | (define (filter pred list) | |
6ddd9412 | 691 | (check-arg-type list? list "filter") ; reject circular lists. |
848458d9 GH |
692 | (letrec ((filiter (lambda (pred rest result) |
693 | (if (null? rest) | |
694 | (reverse! result) | |
695 | (filiter pred (cdr rest) | |
696 | (cond ((pred (car rest)) | |
697 | (cons (car rest) result)) | |
698 | (else | |
699 | result))))))) | |
700 | (filiter pred list '()))) | |
e9680547 MG |
701 | |
702 | (define (partition pred list) | |
703 | (if (null? list) | |
704 | (values '() '()) | |
705 | (if (pred (car list)) | |
706 | (receive (in out) (partition pred (cdr list)) | |
707 | (values (cons (car list) in) out)) | |
708 | (receive (in out) (partition pred (cdr list)) | |
709 | (values in (cons (car list) out)))))) | |
710 | ||
711 | (define (remove pred list) | |
848458d9 | 712 | (filter (lambda (x) (not (pred x))) list)) |
e9680547 MG |
713 | |
714 | (define (filter! pred list) | |
715 | (filter pred list)) ; XXX:optimize | |
716 | ||
717 | (define (partition! pred list) | |
718 | (partition pred list)) ; XXX:optimize | |
719 | ||
720 | (define (remove! pred list) | |
721 | (remove pred list)) ; XXX:optimize | |
722 | ||
723 | ;;; Searching | |
724 | ||
725 | (define (find pred clist) | |
726 | (if (null? clist) | |
727 | #f | |
728 | (if (pred (car clist)) | |
729 | (car clist) | |
730 | (find pred (cdr clist))))) | |
731 | ||
732 | (define (find-tail pred clist) | |
733 | (if (null? clist) | |
734 | #f | |
735 | (if (pred (car clist)) | |
736 | clist | |
737 | (find-tail pred (cdr clist))))) | |
738 | ||
e4cb30df TTN |
739 | (define (take-while pred ls) |
740 | (cond ((null? ls) '()) | |
741 | ((not (pred (car ls))) '()) | |
742 | (else | |
743 | (let ((result (list (car ls)))) | |
744 | (let lp ((ls (cdr ls)) (p result)) | |
745 | (cond ((null? ls) result) | |
746 | ((not (pred (car ls))) result) | |
747 | (else | |
748 | (set-cdr! p (list (car ls))) | |
749 | (lp (cdr ls) (cdr p))))))))) | |
e9680547 MG |
750 | |
751 | (define (take-while! pred clist) | |
752 | (take-while pred clist)) ; XXX:optimize | |
753 | ||
754 | (define (drop-while pred clist) | |
755 | (if (null? clist) | |
756 | '() | |
757 | (if (pred (car clist)) | |
758 | (drop-while pred (cdr clist)) | |
759 | clist))) | |
760 | ||
761 | (define (span pred clist) | |
762 | (if (null? clist) | |
763 | (values '() '()) | |
764 | (if (pred (car clist)) | |
765 | (receive (first last) (span pred (cdr clist)) | |
766 | (values (cons (car clist) first) last)) | |
767 | (values '() clist)))) | |
768 | ||
769 | (define (span! pred list) | |
770 | (span pred list)) ; XXX:optimize | |
771 | ||
772 | (define (break pred clist) | |
773 | (if (null? clist) | |
774 | (values '() '()) | |
775 | (if (pred (car clist)) | |
776 | (values '() clist) | |
777 | (receive (first last) (break pred (cdr clist)) | |
778 | (values (cons (car clist) first) last))))) | |
779 | ||
780 | (define (break! pred list) | |
781 | (break pred list)) ; XXX:optimize | |
782 | ||
783 | (define (any pred ls . lists) | |
784 | (if (null? lists) | |
785 | (any1 pred ls) | |
786 | (let lp ((lists (cons ls lists))) | |
787 | (cond ((any1 null? lists) | |
788 | #f) | |
cef248dd MG |
789 | ((any1 null? (map1 cdr lists)) |
790 | (apply pred (map1 car lists))) | |
e9680547 | 791 | (else |
cef248dd | 792 | (or (apply pred (map1 car lists)) (lp (map1 cdr lists)))))))) |
e9680547 MG |
793 | |
794 | (define (any1 pred ls) | |
795 | (let lp ((ls ls)) | |
796 | (cond ((null? ls) | |
797 | #f) | |
798 | ((null? (cdr ls)) | |
799 | (pred (car ls))) | |
800 | (else | |
801 | (or (pred (car ls)) (lp (cdr ls))))))) | |
802 | ||
803 | (define (every pred ls . lists) | |
804 | (if (null? lists) | |
805 | (every1 pred ls) | |
806 | (let lp ((lists (cons ls lists))) | |
807 | (cond ((any1 null? lists) | |
808 | #t) | |
cef248dd MG |
809 | ((any1 null? (map1 cdr lists)) |
810 | (apply pred (map1 car lists))) | |
e9680547 | 811 | (else |
cef248dd | 812 | (and (apply pred (map1 car lists)) (lp (map1 cdr lists)))))))) |
e9680547 MG |
813 | |
814 | (define (every1 pred ls) | |
815 | (let lp ((ls ls)) | |
816 | (cond ((null? ls) | |
817 | #t) | |
818 | ((null? (cdr ls)) | |
819 | (pred (car ls))) | |
820 | (else | |
821 | (and (pred (car ls)) (lp (cdr ls))))))) | |
822 | ||
823 | (define (list-index pred clist1 . rest) | |
824 | (if (null? rest) | |
825 | (let lp ((l clist1) (i 0)) | |
826 | (if (null? l) | |
827 | #f | |
828 | (if (pred (car l)) | |
829 | i | |
830 | (lp (cdr l) (+ i 1))))) | |
831 | (let lp ((lists (cons clist1 rest)) (i 0)) | |
832 | (cond ((any1 null? lists) | |
833 | #f) | |
cef248dd | 834 | ((apply pred (map1 car lists)) i) |
e9680547 | 835 | (else |
cef248dd | 836 | (lp (map1 cdr lists) (+ i 1))))))) |
e9680547 | 837 | |
e9680547 MG |
838 | ;;; Deletion |
839 | ||
840 | (define (delete x list . rest) | |
841 | (let ((l= (if (pair? rest) (car rest) equal?))) | |
842 | (let lp ((l list)) | |
843 | (if (null? l) | |
844 | '() | |
845 | (if (l= (car l) x) | |
846 | (lp (cdr l)) | |
847 | (cons (car l) (lp (cdr l)))))))) | |
848 | ||
849 | (define (delete! x list . rest) | |
850 | (let ((l= (if (pair? rest) (car rest) equal?))) | |
851 | (delete x list l=))) ; XXX:optimize | |
852 | ||
853 | (define (delete-duplicates list . rest) | |
854 | (let ((l= (if (pair? rest) (car rest) equal?))) | |
855 | (let lp0 ((l1 list)) | |
856 | (if (null? l1) | |
857 | '() | |
858 | (if (let lp1 ((l2 (cdr l1))) | |
859 | (if (null? l2) | |
860 | #f | |
861 | (if (l= (car l1) (car l2)) | |
862 | #t | |
863 | (lp1 (cdr l2))))) | |
864 | (lp0 (cdr l1)) | |
563058ef MG |
865 | (cons (car l1) (lp0 (cdr l1)))))))) |
866 | ||
867 | (define (delete-duplicates list . rest) | |
868 | (let ((l= (if (pair? rest) (car rest) equal?))) | |
869 | (let lp ((list list)) | |
513a3bd7 | 870 | (if (null? list) |
563058ef MG |
871 | '() |
872 | (cons (car list) (lp (delete (car list) (cdr list) l=))))))) | |
e9680547 MG |
873 | |
874 | (define (delete-duplicates! list . rest) | |
875 | (let ((l= (if (pair? rest) (car rest) equal?))) | |
876 | (delete-duplicates list l=))) ; XXX:optimize | |
877 | ||
878 | ;;; Association lists | |
879 | ||
e9680547 MG |
880 | (define (alist-cons key datum alist) |
881 | (acons key datum alist)) | |
882 | ||
883 | (define (alist-copy alist) | |
884 | (let lp ((a alist)) | |
885 | (if (null? a) | |
886 | '() | |
563058ef | 887 | (acons (caar a) (cdar a) (lp (cdr a)))))) |
e9680547 MG |
888 | |
889 | (define (alist-delete key alist . rest) | |
890 | (let ((k= (if (pair? rest) (car rest) equal?))) | |
891 | (let lp ((a alist)) | |
892 | (if (null? a) | |
893 | '() | |
894 | (if (k= (caar a) key) | |
895 | (lp (cdr a)) | |
896 | (cons (car a) (lp (cdr a)))))))) | |
897 | ||
898 | (define (alist-delete! key alist . rest) | |
899 | (let ((k= (if (pair? rest) (car rest) equal?))) | |
900 | (alist-delete key alist k=))) ; XXX:optimize | |
901 | ||
902 | ;;; Set operations on lists | |
903 | ||
904 | (define (lset<= = . rest) | |
905 | (if (null? rest) | |
906 | #t | |
907 | (let lp ((f (car rest)) (r (cdr rest))) | |
908 | (or (null? r) | |
909 | (and (every (lambda (el) (member el (car r) =)) f) | |
910 | (lp (car r) (cdr r))))))) | |
911 | ||
912 | (define (lset= = list1 . rest) | |
913 | (if (null? rest) | |
914 | #t | |
915 | (let lp ((f list1) (r rest)) | |
916 | (or (null? r) | |
917 | (and (every (lambda (el) (member el (car r) =)) f) | |
918 | (every (lambda (el) (member el f =)) (car r)) | |
919 | (lp (car r) (cdr r))))))) | |
920 | ||
921 | (define (lset-adjoin = list . rest) | |
922 | (let lp ((l rest) (acc list)) | |
923 | (if (null? l) | |
924 | acc | |
925 | (if (member (car l) acc) | |
926 | (lp (cdr l) acc) | |
927 | (lp (cdr l) (cons (car l) acc)))))) | |
928 | ||
929 | (define (lset-union = . rest) | |
930 | (let lp0 ((l rest) (acc '())) | |
931 | (if (null? l) | |
932 | (reverse! acc) | |
933 | (let lp1 ((ll (car l)) (acc acc)) | |
934 | (if (null? ll) | |
935 | (lp0 (cdr l) acc) | |
936 | (if (member (car ll) acc =) | |
937 | (lp1 (cdr ll) acc) | |
938 | (lp1 (cdr ll) (cons (car ll) acc)))))))) | |
939 | ||
940 | (define (lset-intersection = list1 . rest) | |
941 | (let lp ((l list1) (acc '())) | |
942 | (if (null? l) | |
943 | (reverse! acc) | |
944 | (if (every (lambda (ll) (member (car l) ll =)) rest) | |
945 | (lp (cdr l) (cons (car l) acc)) | |
946 | (lp (cdr l) acc))))) | |
947 | ||
948 | (define (lset-difference = list1 . rest) | |
949 | (if (null? rest) | |
950 | list1 | |
951 | (let lp ((l list1) (acc '())) | |
952 | (if (null? l) | |
953 | (reverse! acc) | |
954 | (if (any (lambda (ll) (member (car l) ll =)) rest) | |
955 | (lp (cdr l) acc) | |
956 | (lp (cdr l) (cons (car l) acc))))))) | |
957 | ||
958 | ;(define (fold kons knil list1 . rest) | |
959 | ||
960 | (define (lset-xor = . rest) | |
961 | (fold (lambda (lst res) | |
962 | (let lp ((l lst) (acc '())) | |
963 | (if (null? l) | |
964 | (let lp0 ((r res) (acc acc)) | |
965 | (if (null? r) | |
966 | (reverse! acc) | |
967 | (if (member (car r) lst =) | |
968 | (lp0 (cdr r) acc) | |
969 | (lp0 (cdr r) (cons (car r) acc))))) | |
970 | (if (member (car l) res =) | |
971 | (lp (cdr l) acc) | |
972 | (lp (cdr l) (cons (car l) acc)))))) | |
973 | '() | |
974 | rest)) | |
975 | ||
976 | (define (lset-diff+intersection = list1 . rest) | |
977 | (let lp ((l list1) (accd '()) (acci '())) | |
978 | (if (null? l) | |
979 | (values (reverse! accd) (reverse! acci)) | |
980 | (let ((appears (every (lambda (ll) (member (car l) ll =)) rest))) | |
981 | (if appears | |
982 | (lp (cdr l) accd (cons (car l) acci)) | |
983 | (lp (cdr l) (cons (car l) accd) acci)))))) | |
984 | ||
985 | ||
986 | (define (lset-union! = . rest) | |
987 | (apply lset-union = rest)) ; XXX:optimize | |
988 | ||
989 | (define (lset-intersection! = list1 . rest) | |
990 | (apply lset-intersection = list1 rest)) ; XXX:optimize | |
991 | ||
992 | (define (lset-difference! = list1 . rest) | |
993 | (apply lset-difference = list1 rest)) ; XXX:optimize | |
994 | ||
995 | (define (lset-xor! = . rest) | |
996 | (apply lset-xor = rest)) ; XXX:optimize | |
997 | ||
998 | (define (lset-diff+intersection! = list1 . rest) | |
999 | (apply lset-diff+intersection = list1 rest)) ; XXX:optimize | |
6be07c52 TTN |
1000 | |
1001 | ;;; srfi-1.scm ends here |