Commit | Line | Data |
---|---|---|
6be07c52 TTN |
1 | ;;; srfi-19.scm --- Time/Date Library |
2 | ||
abab34ce | 3 | ;; Copyright (C) 2001, 2002, 2003, 2005, 2006, 2007, 2008, 2009, 2010, 2011 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 | |
83ba2d37 | 8 | ;; version 3 of the License, or (at your option) any later version. |
73be1d9e MV |
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 | |
92205699 | 17 | ;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
6be07c52 TTN |
18 | |
19 | ;;; Author: Rob Browning <rlb@cs.utexas.edu> | |
20 | ;;; Originally from SRFI reference implementation by Will Fitzgerald. | |
0706ae06 TTN |
21 | |
22 | ;;; Commentary: | |
23 | ||
0706ae06 TTN |
24 | ;; This module is fully documented in the Guile Reference Manual. |
25 | ||
26 | ;;; Code: | |
5bbfe8cb RB |
27 | |
28 | ;; FIXME: I haven't checked a decent amount of this code for potential | |
29 | ;; performance improvements, but I suspect that there may be some | |
30 | ;; substantial ones to be realized, esp. in the later "parsing" half | |
31 | ;; of the file, by rewriting the code with use of more Guile native | |
32 | ;; functions that do more work in a "chunk". | |
4549ba4a MV |
33 | ;; |
34 | ;; FIXME: mkoeppe: Time zones are treated a little simplistic in | |
35 | ;; SRFI-19; they are only a numeric offset. Thus, printing time zones | |
abab34ce | 36 | ;; (LOCALE-PRINT-TIME-ZONE) can't be implemented sensibly. The |
4549ba4a MV |
37 | ;; functions taking an optional TZ-OFFSET should be extended to take a |
38 | ;; symbolic time-zone (like "CET"); this string should be stored in | |
39 | ;; the DATE structure. | |
5bbfe8cb RB |
40 | |
41 | (define-module (srfi srfi-19) | |
5bbfe8cb RB |
42 | :use-module (srfi srfi-6) |
43 | :use-module (srfi srfi-8) | |
a2f00b9b | 44 | :use-module (srfi srfi-9) |
84012ef4 | 45 | :autoload (ice-9 rdelim) (read-line) |
bf943698 | 46 | :use-module (ice-9 i18n) |
d68a81e0 | 47 | :replace (current-time) |
bf943698 | 48 | :export (;; Constants |
5bbfe8cb RB |
49 | time-duration |
50 | time-monotonic | |
51 | time-process | |
52 | time-tai | |
53 | time-thread | |
54 | time-utc | |
55 | ;; Current time and clock resolution | |
56 | current-date | |
57 | current-julian-day | |
58 | current-modified-julian-day | |
5bbfe8cb RB |
59 | time-resolution |
60 | ;; Time object and accessors | |
61 | make-time | |
62 | time? | |
63 | time-type | |
64 | time-nanosecond | |
65 | time-second | |
66 | set-time-type! | |
67 | set-time-nanosecond! | |
68 | set-time-second! | |
69 | copy-time | |
70 | ;; Time comparison procedures | |
71 | time<=? | |
72 | time<? | |
73 | time=? | |
74 | time>=? | |
75 | time>? | |
76 | ;; Time arithmetic procedures | |
77 | time-difference | |
78 | time-difference! | |
79 | add-duration | |
80 | add-duration! | |
81 | subtract-duration | |
82 | subtract-duration! | |
83 | ;; Date object and accessors | |
84 | make-date | |
85 | date? | |
86 | date-nanosecond | |
87 | date-second | |
88 | date-minute | |
89 | date-hour | |
90 | date-day | |
91 | date-month | |
92 | date-year | |
4549ba4a | 93 | date-zone-offset |
5bbfe8cb RB |
94 | date-year-day |
95 | date-week-day | |
96 | date-week-number | |
97 | ;; Time/Date/Julian Day/Modified Julian Day converters | |
98 | date->julian-day | |
99 | date->modified-julian-day | |
100 | date->time-monotonic | |
101 | date->time-tai | |
102 | date->time-utc | |
103 | julian-day->date | |
104 | julian-day->time-monotonic | |
105 | julian-day->time-tai | |
106 | julian-day->time-utc | |
107 | modified-julian-day->date | |
108 | modified-julian-day->time-monotonic | |
109 | modified-julian-day->time-tai | |
110 | modified-julian-day->time-utc | |
111 | time-monotonic->date | |
bf943698 LC |
112 | time-monotonic->julian-day |
113 | time-monotonic->modified-julian-day | |
5bbfe8cb RB |
114 | time-monotonic->time-tai |
115 | time-monotonic->time-tai! | |
116 | time-monotonic->time-utc | |
117 | time-monotonic->time-utc! | |
118 | time-tai->date | |
119 | time-tai->julian-day | |
120 | time-tai->modified-julian-day | |
121 | time-tai->time-monotonic | |
122 | time-tai->time-monotonic! | |
123 | time-tai->time-utc | |
124 | time-tai->time-utc! | |
125 | time-utc->date | |
126 | time-utc->julian-day | |
127 | time-utc->modified-julian-day | |
128 | time-utc->time-monotonic | |
129 | time-utc->time-monotonic! | |
130 | time-utc->time-tai | |
131 | time-utc->time-tai! | |
132 | ;; Date to string/string to date converters. | |
133 | date->string | |
bf943698 | 134 | string->date)) |
5bbfe8cb | 135 | |
1b2f40b9 MG |
136 | (cond-expand-provide (current-module) '(srfi-19)) |
137 | ||
5bbfe8cb RB |
138 | (define time-tai 'time-tai) |
139 | (define time-utc 'time-utc) | |
140 | (define time-monotonic 'time-monotonic) | |
141 | (define time-thread 'time-thread) | |
142 | (define time-process 'time-process) | |
143 | (define time-duration 'time-duration) | |
144 | ||
145 | ;; FIXME: do we want to add gc time? | |
146 | ;; (define time-gc 'time-gc) | |
147 | ||
148 | ;;-- LOCALE dependent constants | |
149 | ||
5bbfe8cb | 150 | ;; See date->string |
abab34ce AW |
151 | (define locale-date-time-format "~a ~b ~d ~H:~M:~S~z ~Y") |
152 | (define locale-short-date-format "~m/~d/~y") | |
153 | (define locale-time-format "~H:~M:~S") | |
154 | (define iso-8601-date-time-format "~Y-~m-~dT~H:~M:~S~z") | |
5bbfe8cb RB |
155 | |
156 | ;;-- Miscellaneous Constants. | |
abab34ce | 157 | ;;-- only the tai-epoch-in-jd might need changing if |
5bbfe8cb RB |
158 | ;; a different epoch is used. |
159 | ||
abab34ce AW |
160 | (define nano 1000000000) ; nanoseconds in a second |
161 | (define sid 86400) ; seconds in a day | |
162 | (define sihd 43200) ; seconds in a half day | |
163 | (define tai-epoch-in-jd 4881175/2) ; julian day number for 'the epoch' | |
5bbfe8cb RB |
164 | |
165 | ;; FIXME: should this be something other than misc-error? | |
abab34ce | 166 | (define (time-error caller type value) |
5bbfe8cb RB |
167 | (if value |
168 | (throw 'misc-error caller "TIME-ERROR type ~A: ~S" (list type value) #f) | |
169 | (throw 'misc-error caller "TIME-ERROR type ~A" (list type) #f))) | |
170 | ||
171 | ;; A table of leap seconds | |
172 | ;; See ftp://maia.usno.navy.mil/ser7/tai-utc.dat | |
173 | ;; and update as necessary. | |
174 | ;; this procedures reads the file in the abover | |
175 | ;; format and creates the leap second table | |
afb47f6d | 176 | ;; it also calls the almost standard, but not R5 procedures read-line |
5bbfe8cb | 177 | ;; & open-input-string |
abab34ce | 178 | ;; ie (set! leap-second-table (read-tai-utc-date "tai-utc.dat")) |
5bbfe8cb | 179 | |
abab34ce | 180 | (define (read-tai-utc-data filename) |
5bbfe8cb | 181 | (define (convert-jd jd) |
abab34ce | 182 | (* (- (inexact->exact jd) tai-epoch-in-jd) sid)) |
5bbfe8cb RB |
183 | (define (convert-sec sec) |
184 | (inexact->exact sec)) | |
185 | (let ((port (open-input-file filename)) | |
186 | (table '())) | |
187 | (let loop ((line (read-line port))) | |
994e8417 | 188 | (if (not (eof-object? line)) |
5bbfe8cb RB |
189 | (begin |
190 | (let* ((data (read (open-input-string | |
afb47f6d | 191 | (string-append "(" line ")")))) |
5bbfe8cb RB |
192 | (year (car data)) |
193 | (jd (cadddr (cdr data))) | |
194 | (secs (cadddr (cdddr data)))) | |
195 | (if (>= year 1972) | |
196 | (set! table (cons | |
197 | (cons (convert-jd jd) (convert-sec secs)) | |
198 | table))) | |
199 | (loop (read-line port)))))) | |
200 | table)) | |
201 | ||
202 | ;; each entry is (tai seconds since epoch . # seconds to subtract for utc) | |
203 | ;; note they go higher to lower, and end in 1972. | |
abab34ce | 204 | (define leap-second-table |
73e2a8d1 KR |
205 | '((1136073600 . 33) |
206 | (915148800 . 32) | |
5bbfe8cb RB |
207 | (867715200 . 31) |
208 | (820454400 . 30) | |
209 | (773020800 . 29) | |
210 | (741484800 . 28) | |
211 | (709948800 . 27) | |
212 | (662688000 . 26) | |
213 | (631152000 . 25) | |
214 | (567993600 . 24) | |
215 | (489024000 . 23) | |
216 | (425865600 . 22) | |
217 | (394329600 . 21) | |
218 | (362793600 . 20) | |
219 | (315532800 . 19) | |
220 | (283996800 . 18) | |
221 | (252460800 . 17) | |
222 | (220924800 . 16) | |
223 | (189302400 . 15) | |
224 | (157766400 . 14) | |
225 | (126230400 . 13) | |
226 | (94694400 . 12) | |
227 | (78796800 . 11) | |
228 | (63072000 . 10))) | |
229 | ||
230 | (define (read-leap-second-table filename) | |
abab34ce | 231 | (set! leap-second-table (read-tai-utc-data filename))) |
5bbfe8cb RB |
232 | |
233 | ||
abab34ce | 234 | (define (leap-second-delta utc-seconds) |
5bbfe8cb RB |
235 | (letrec ((lsd (lambda (table) |
236 | (cond ((>= utc-seconds (caar table)) | |
237 | (cdar table)) | |
238 | (else (lsd (cdr table))))))) | |
abab34ce AW |
239 | (if (< utc-seconds (* (- 1972 1970) 365 sid)) 0 |
240 | (lsd leap-second-table)))) | |
5bbfe8cb RB |
241 | |
242 | ||
243 | ;;; the TIME structure; creates the accessors, too. | |
244 | ||
245 | (define-record-type time | |
246 | (make-time-unnormalized type nanosecond second) | |
247 | time? | |
248 | (type time-type set-time-type!) | |
249 | (nanosecond time-nanosecond set-time-nanosecond!) | |
250 | (second time-second set-time-second!)) | |
251 | ||
252 | (define (copy-time time) | |
253 | (make-time (time-type time) (time-nanosecond time) (time-second time))) | |
254 | ||
abab34ce | 255 | (define (split-real r) |
b21cccf3 MD |
256 | (if (integer? r) |
257 | (values (inexact->exact r) 0) | |
4549ba4a MV |
258 | (let ((l (truncate r))) |
259 | (values (inexact->exact l) (- r l))))) | |
260 | ||
abab34ce | 261 | (define (time-normalize! t) |
5bbfe8cb | 262 | (if (>= (abs (time-nanosecond t)) 1000000000) |
4549ba4a | 263 | (receive (int frac) |
abab34ce | 264 | (split-real (time-nanosecond t)) |
4549ba4a MV |
265 | (set-time-second! t (+ (time-second t) |
266 | (quotient int 1000000000))) | |
267 | (set-time-nanosecond! t (+ (remainder int 1000000000) | |
268 | frac)))) | |
5bbfe8cb RB |
269 | (if (and (positive? (time-second t)) |
270 | (negative? (time-nanosecond t))) | |
271 | (begin | |
272 | (set-time-second! t (- (time-second t) 1)) | |
273 | (set-time-nanosecond! t (+ 1000000000 (time-nanosecond t)))) | |
274 | (if (and (negative? (time-second t)) | |
275 | (positive? (time-nanosecond t))) | |
276 | (begin | |
277 | (set-time-second! t (+ (time-second t) 1)) | |
278 | (set-time-nanosecond! t (+ 1000000000 (time-nanosecond t)))))) | |
279 | t) | |
280 | ||
281 | (define (make-time type nanosecond second) | |
abab34ce | 282 | (time-normalize! (make-time-unnormalized type nanosecond second))) |
5bbfe8cb RB |
283 | |
284 | ;; Helpers | |
285 | ;; FIXME: finish this and publish it? | |
286 | (define (date->broken-down-time date) | |
287 | (let ((result (mktime 0))) | |
288 | ;; FIXME: What should we do about leap-seconds which may overflow | |
289 | ;; set-tm:sec? | |
290 | (set-tm:sec result (date-second date)) | |
291 | (set-tm:min result (date-minute date)) | |
292 | (set-tm:hour result (date-hour date)) | |
293 | ;; FIXME: SRFI day ranges from 0-31. (not compatible with set-tm:mday). | |
294 | (set-tm:mday result (date-day date)) | |
84012ef4 | 295 | (set-tm:mon result (- (date-month date) 1)) |
5bbfe8cb RB |
296 | ;; FIXME: need to signal error on range violation. |
297 | (set-tm:year result (+ 1900 (date-year date))) | |
298 | (set-tm:isdst result -1) | |
299 | (set-tm:gmtoff result (- (date-zone-offset date))) | |
300 | result)) | |
301 | ||
302 | ;;; current-time | |
303 | ||
304 | ;;; specific time getters. | |
305 | ||
abab34ce | 306 | (define (current-time-utc) |
5bbfe8cb RB |
307 | ;; Resolution is microseconds. |
308 | (let ((tod (gettimeofday))) | |
309 | (make-time time-utc (* (cdr tod) 1000) (car tod)))) | |
310 | ||
abab34ce | 311 | (define (current-time-tai) |
5bbfe8cb RB |
312 | ;; Resolution is microseconds. |
313 | (let* ((tod (gettimeofday)) | |
314 | (sec (car tod)) | |
315 | (usec (cdr tod))) | |
316 | (make-time time-tai | |
317 | (* usec 1000) | |
abab34ce | 318 | (+ (car tod) (leap-second-delta sec))))) |
5bbfe8cb | 319 | |
abab34ce | 320 | ;;(define (current-time-ms-time time-type proc) |
5bbfe8cb RB |
321 | ;; (let ((current-ms (proc))) |
322 | ;; (make-time time-type | |
323 | ;; (quotient current-ms 10000) | |
324 | ;; (* (remainder current-ms 1000) 10000)))) | |
325 | ||
326 | ;; -- we define it to be the same as TAI. | |
327 | ;; A different implemation of current-time-montonic | |
328 | ;; will require rewriting all of the time-monotonic converters, | |
329 | ;; of course. | |
330 | ||
abab34ce | 331 | (define (current-time-monotonic) |
5bbfe8cb | 332 | ;; Resolution is microseconds. |
abab34ce | 333 | (current-time-tai)) |
5bbfe8cb | 334 | |
abab34ce AW |
335 | (define (current-time-thread) |
336 | (time-error 'current-time 'unsupported-clock-type 'time-thread)) | |
5bbfe8cb | 337 | |
abab34ce | 338 | (define ns-per-guile-tick (/ 1000000000 internal-time-units-per-second)) |
5bbfe8cb | 339 | |
abab34ce | 340 | (define (current-time-process) |
5bbfe8cb RB |
341 | (let ((run-time (get-internal-run-time))) |
342 | (make-time | |
343 | time-process | |
5bbfe8cb | 344 | (* (remainder run-time internal-time-units-per-second) |
abab34ce | 345 | ns-per-guile-tick) |
5bbfe8cb RB |
346 | (quotient run-time internal-time-units-per-second)))) |
347 | ||
abab34ce AW |
348 | ;;(define (current-time-gc) |
349 | ;; (current-time-ms-time time-gc current-gc-milliseconds)) | |
5bbfe8cb RB |
350 | |
351 | (define (current-time . clock-type) | |
5e1fb41f | 352 | (let ((clock-type (if (null? clock-type) time-utc (car clock-type)))) |
5bbfe8cb | 353 | (cond |
abab34ce AW |
354 | ((eq? clock-type time-tai) (current-time-tai)) |
355 | ((eq? clock-type time-utc) (current-time-utc)) | |
356 | ((eq? clock-type time-monotonic) (current-time-monotonic)) | |
357 | ((eq? clock-type time-thread) (current-time-thread)) | |
358 | ((eq? clock-type time-process) (current-time-process)) | |
359 | ;; ((eq? clock-type time-gc) (current-time-gc)) | |
360 | (else (time-error 'current-time 'invalid-clock-type clock-type))))) | |
5bbfe8cb RB |
361 | |
362 | ;; -- Time Resolution | |
363 | ;; This is the resolution of the clock in nanoseconds. | |
364 | ;; This will be implementation specific. | |
365 | ||
366 | (define (time-resolution . clock-type) | |
5e1fb41f | 367 | (let ((clock-type (if (null? clock-type) time-utc (car clock-type)))) |
5bbfe8cb RB |
368 | (case clock-type |
369 | ((time-tai) 1000) | |
370 | ((time-utc) 1000) | |
371 | ((time-monotonic) 1000) | |
abab34ce | 372 | ((time-process) ns-per-guile-tick) |
5bbfe8cb RB |
373 | ;; ((eq? clock-type time-thread) 1000) |
374 | ;; ((eq? clock-type time-gc) 10000) | |
abab34ce | 375 | (else (time-error 'time-resolution 'invalid-clock-type clock-type))))) |
5bbfe8cb RB |
376 | |
377 | ;; -- Time comparisons | |
378 | ||
379 | (define (time=? t1 t2) | |
380 | ;; Arrange tests for speed and presume that t1 and t2 are actually times. | |
381 | ;; also presume it will be rare to check two times of different types. | |
382 | (and (= (time-second t1) (time-second t2)) | |
4549ba4a | 383 | (= (time-nanosecond t1) (time-nanosecond t2)) |
5bbfe8cb RB |
384 | (eq? (time-type t1) (time-type t2)))) |
385 | ||
386 | (define (time>? t1 t2) | |
387 | (or (> (time-second t1) (time-second t2)) | |
388 | (and (= (time-second t1) (time-second t2)) | |
389 | (> (time-nanosecond t1) (time-nanosecond t2))))) | |
390 | ||
391 | (define (time<? t1 t2) | |
392 | (or (< (time-second t1) (time-second t2)) | |
393 | (and (= (time-second t1) (time-second t2)) | |
394 | (< (time-nanosecond t1) (time-nanosecond t2))))) | |
395 | ||
396 | (define (time>=? t1 t2) | |
397 | (or (> (time-second t1) (time-second t2)) | |
398 | (and (= (time-second t1) (time-second t2)) | |
399 | (>= (time-nanosecond t1) (time-nanosecond t2))))) | |
400 | ||
401 | (define (time<=? t1 t2) | |
4549ba4a MV |
402 | (or (< (time-second t1) (time-second t2)) |
403 | (and (= (time-second t1) (time-second t2)) | |
404 | (<= (time-nanosecond t1) (time-nanosecond t2))))) | |
5bbfe8cb RB |
405 | |
406 | ;; -- Time arithmetic | |
407 | ||
408 | (define (time-difference! time1 time2) | |
409 | (let ((sec-diff (- (time-second time1) (time-second time2))) | |
410 | (nsec-diff (- (time-nanosecond time1) (time-nanosecond time2)))) | |
411 | (set-time-type! time1 time-duration) | |
412 | (set-time-second! time1 sec-diff) | |
413 | (set-time-nanosecond! time1 nsec-diff) | |
abab34ce | 414 | (time-normalize! time1))) |
5bbfe8cb RB |
415 | |
416 | (define (time-difference time1 time2) | |
417 | (let ((result (copy-time time1))) | |
418 | (time-difference! result time2))) | |
419 | ||
420 | (define (add-duration! t duration) | |
421 | (if (not (eq? (time-type duration) time-duration)) | |
abab34ce | 422 | (time-error 'add-duration 'not-duration duration) |
5bbfe8cb RB |
423 | (let ((sec-plus (+ (time-second t) (time-second duration))) |
424 | (nsec-plus (+ (time-nanosecond t) (time-nanosecond duration)))) | |
425 | (set-time-second! t sec-plus) | |
426 | (set-time-nanosecond! t nsec-plus) | |
abab34ce | 427 | (time-normalize! t)))) |
5bbfe8cb | 428 | |
4549ba4a | 429 | (define (add-duration t duration) |
5bbfe8cb | 430 | (let ((result (copy-time t))) |
afb47f6d | 431 | (add-duration! result duration))) |
5bbfe8cb RB |
432 | |
433 | (define (subtract-duration! t duration) | |
434 | (if (not (eq? (time-type duration) time-duration)) | |
abab34ce | 435 | (time-error 'add-duration 'not-duration duration) |
5bbfe8cb RB |
436 | (let ((sec-minus (- (time-second t) (time-second duration))) |
437 | (nsec-minus (- (time-nanosecond t) (time-nanosecond duration)))) | |
438 | (set-time-second! t sec-minus) | |
439 | (set-time-nanosecond! t nsec-minus) | |
abab34ce | 440 | (time-normalize! t)))) |
5bbfe8cb RB |
441 | |
442 | (define (subtract-duration time1 duration) | |
443 | (let ((result (copy-time time1))) | |
444 | (subtract-duration! result duration))) | |
445 | ||
446 | ;; -- Converters between types. | |
447 | ||
448 | (define (priv:time-tai->time-utc! time-in time-out caller) | |
449 | (if (not (eq? (time-type time-in) time-tai)) | |
abab34ce | 450 | (time-error caller 'incompatible-time-types time-in)) |
5bbfe8cb RB |
451 | (set-time-type! time-out time-utc) |
452 | (set-time-nanosecond! time-out (time-nanosecond time-in)) | |
453 | (set-time-second! time-out (- (time-second time-in) | |
abab34ce | 454 | (leap-second-delta |
5bbfe8cb RB |
455 | (time-second time-in)))) |
456 | time-out) | |
457 | ||
458 | (define (time-tai->time-utc time-in) | |
4549ba4a | 459 | (priv:time-tai->time-utc! time-in (make-time-unnormalized #f #f #f) 'time-tai->time-utc)) |
5bbfe8cb RB |
460 | |
461 | ||
462 | (define (time-tai->time-utc! time-in) | |
463 | (priv:time-tai->time-utc! time-in time-in 'time-tai->time-utc!)) | |
464 | ||
465 | (define (priv:time-utc->time-tai! time-in time-out caller) | |
466 | (if (not (eq? (time-type time-in) time-utc)) | |
abab34ce | 467 | (time-error caller 'incompatible-time-types time-in)) |
5bbfe8cb RB |
468 | (set-time-type! time-out time-tai) |
469 | (set-time-nanosecond! time-out (time-nanosecond time-in)) | |
470 | (set-time-second! time-out (+ (time-second time-in) | |
abab34ce | 471 | (leap-second-delta |
5bbfe8cb RB |
472 | (time-second time-in)))) |
473 | time-out) | |
474 | ||
475 | (define (time-utc->time-tai time-in) | |
4549ba4a | 476 | (priv:time-utc->time-tai! time-in (make-time-unnormalized #f #f #f) 'time-utc->time-tai)) |
5bbfe8cb RB |
477 | |
478 | (define (time-utc->time-tai! time-in) | |
479 | (priv:time-utc->time-tai! time-in time-in 'time-utc->time-tai!)) | |
480 | ||
481 | ;; -- these depend on time-monotonic having the same definition as time-tai! | |
482 | (define (time-monotonic->time-utc time-in) | |
483 | (if (not (eq? (time-type time-in) time-monotonic)) | |
abab34ce | 484 | (time-error 'time-monotonic->time-utc |
84012ef4 | 485 | 'incompatible-time-types time-in)) |
5bbfe8cb RB |
486 | (let ((ntime (copy-time time-in))) |
487 | (set-time-type! ntime time-tai) | |
488 | (priv:time-tai->time-utc! ntime ntime 'time-monotonic->time-utc))) | |
489 | ||
490 | (define (time-monotonic->time-utc! time-in) | |
491 | (if (not (eq? (time-type time-in) time-monotonic)) | |
abab34ce | 492 | (time-error 'time-monotonic->time-utc! |
84012ef4 | 493 | 'incompatible-time-types time-in)) |
5bbfe8cb | 494 | (set-time-type! time-in time-tai) |
84012ef4 | 495 | (priv:time-tai->time-utc! time-in time-in 'time-monotonic->time-utc)) |
5bbfe8cb RB |
496 | |
497 | (define (time-monotonic->time-tai time-in) | |
498 | (if (not (eq? (time-type time-in) time-monotonic)) | |
abab34ce | 499 | (time-error 'time-monotonic->time-tai |
84012ef4 | 500 | 'incompatible-time-types time-in)) |
5bbfe8cb RB |
501 | (let ((ntime (copy-time time-in))) |
502 | (set-time-type! ntime time-tai) | |
503 | ntime)) | |
504 | ||
505 | (define (time-monotonic->time-tai! time-in) | |
506 | (if (not (eq? (time-type time-in) time-monotonic)) | |
abab34ce | 507 | (time-error 'time-monotonic->time-tai! |
84012ef4 | 508 | 'incompatible-time-types time-in)) |
5bbfe8cb RB |
509 | (set-time-type! time-in time-tai) |
510 | time-in) | |
511 | ||
512 | (define (time-utc->time-monotonic time-in) | |
513 | (if (not (eq? (time-type time-in) time-utc)) | |
abab34ce | 514 | (time-error 'time-utc->time-monotonic |
84012ef4 | 515 | 'incompatible-time-types time-in)) |
4549ba4a | 516 | (let ((ntime (priv:time-utc->time-tai! time-in (make-time-unnormalized #f #f #f) |
5bbfe8cb RB |
517 | 'time-utc->time-monotonic))) |
518 | (set-time-type! ntime time-monotonic) | |
519 | ntime)) | |
520 | ||
521 | (define (time-utc->time-monotonic! time-in) | |
522 | (if (not (eq? (time-type time-in) time-utc)) | |
abab34ce | 523 | (time-error 'time-utc->time-monotonic! |
84012ef4 | 524 | 'incompatible-time-types time-in)) |
5bbfe8cb RB |
525 | (let ((ntime (priv:time-utc->time-tai! time-in time-in |
526 | 'time-utc->time-monotonic!))) | |
527 | (set-time-type! ntime time-monotonic) | |
528 | ntime)) | |
529 | ||
530 | (define (time-tai->time-monotonic time-in) | |
531 | (if (not (eq? (time-type time-in) time-tai)) | |
abab34ce | 532 | (time-error 'time-tai->time-monotonic |
84012ef4 | 533 | 'incompatible-time-types time-in)) |
5bbfe8cb RB |
534 | (let ((ntime (copy-time time-in))) |
535 | (set-time-type! ntime time-monotonic) | |
536 | ntime)) | |
537 | ||
538 | (define (time-tai->time-monotonic! time-in) | |
539 | (if (not (eq? (time-type time-in) time-tai)) | |
abab34ce | 540 | (time-error 'time-tai->time-monotonic! |
84012ef4 | 541 | 'incompatible-time-types time-in)) |
5bbfe8cb RB |
542 | (set-time-type! time-in time-monotonic) |
543 | time-in) | |
544 | ||
545 | ;; -- Date Structures | |
546 | ||
5e1fb41f RB |
547 | ;; FIXME: to be really safe, perhaps we should normalize the |
548 | ;; seconds/nanoseconds/minutes coming in to make-date... | |
549 | ||
5bbfe8cb | 550 | (define-record-type date |
5e1fb41f RB |
551 | (make-date nanosecond second minute |
552 | hour day month | |
553 | year | |
554 | zone-offset) | |
5bbfe8cb | 555 | date? |
4549ba4a MV |
556 | (nanosecond date-nanosecond set-date-nanosecond!) |
557 | (second date-second set-date-second!) | |
558 | (minute date-minute set-date-minute!) | |
559 | (hour date-hour set-date-hour!) | |
560 | (day date-day set-date-day!) | |
561 | (month date-month set-date-month!) | |
562 | (year date-year set-date-year!) | |
563 | (zone-offset date-zone-offset set-date-zone-offset!)) | |
5e1fb41f | 564 | |
5bbfe8cb | 565 | ;; gives the julian day which starts at noon. |
abab34ce | 566 | (define (encode-julian-day-number day month year) |
5bbfe8cb RB |
567 | (let* ((a (quotient (- 14 month) 12)) |
568 | (y (- (+ year 4800) a (if (negative? year) -1 0))) | |
569 | (m (- (+ month (* 12 a)) 3))) | |
570 | (+ day | |
571 | (quotient (+ (* 153 m) 2) 5) | |
572 | (* 365 y) | |
573 | (quotient y 4) | |
574 | (- (quotient y 100)) | |
575 | (quotient y 400) | |
576 | -32045))) | |
577 | ||
afb47f6d | 578 | ;; gives the seconds/date/month/year |
abab34ce | 579 | (define (decode-julian-day-number jdn) |
5e1fb41f | 580 | (let* ((days (inexact->exact (truncate jdn))) |
5bbfe8cb RB |
581 | (a (+ days 32044)) |
582 | (b (quotient (+ (* 4 a) 3) 146097)) | |
583 | (c (- a (quotient (* 146097 b) 4))) | |
584 | (d (quotient (+ (* 4 c) 3) 1461)) | |
585 | (e (- c (quotient (* 1461 d) 4))) | |
586 | (m (quotient (+ (* 5 e) 2) 153)) | |
587 | (y (+ (* 100 b) d -4800 (quotient m 10)))) | |
588 | (values ; seconds date month year | |
abab34ce | 589 | (* (- jdn days) sid) |
5bbfe8cb RB |
590 | (+ e (- (quotient (+ (* 153 m) 2) 5)) 1) |
591 | (+ m 3 (* -12 (quotient m 10))) | |
592 | (if (>= 0 y) (- y 1) y)))) | |
593 | ||
594 | ;; relies on the fact that we named our time zone accessor | |
595 | ;; differently from MzScheme's.... | |
596 | ;; This should be written to be OS specific. | |
597 | ||
abab34ce | 598 | (define (local-tz-offset utc-time) |
5bbfe8cb | 599 | ;; SRFI uses seconds West, but guile (and libc) use seconds East. |
4549ba4a | 600 | (- (tm:gmtoff (localtime (time-second utc-time))))) |
5bbfe8cb RB |
601 | |
602 | ;; special thing -- ignores nanos | |
abab34ce AW |
603 | (define (time->julian-day-number seconds tz-offset) |
604 | (+ (/ (+ seconds tz-offset sihd) | |
605 | sid) | |
606 | tai-epoch-in-jd)) | |
5bbfe8cb | 607 | |
abab34ce AW |
608 | (define (leap-second? second) |
609 | (and (assoc second leap-second-table) #t)) | |
5bbfe8cb RB |
610 | |
611 | (define (time-utc->date time . tz-offset) | |
612 | (if (not (eq? (time-type time) time-utc)) | |
abab34ce | 613 | (time-error 'time->date 'incompatible-time-types time)) |
4549ba4a | 614 | (let* ((offset (if (null? tz-offset) |
abab34ce | 615 | (local-tz-offset time) |
4549ba4a | 616 | (car tz-offset))) |
abab34ce AW |
617 | (leap-second? (leap-second? (+ offset (time-second time)))) |
618 | (jdn (time->julian-day-number (if leap-second? | |
5bbfe8cb RB |
619 | (- (time-second time) 1) |
620 | (time-second time)) | |
621 | offset))) | |
622 | ||
abab34ce | 623 | (call-with-values (lambda () (decode-julian-day-number jdn)) |
5bbfe8cb | 624 | (lambda (secs date month year) |
4549ba4a MV |
625 | ;; secs is a real because jdn is a real in Guile; |
626 | ;; but it is conceptionally an integer. | |
627 | (let* ((int-secs (inexact->exact (round secs))) | |
5e1fb41f RB |
628 | (hours (quotient int-secs (* 60 60))) |
629 | (rem (remainder int-secs (* 60 60))) | |
5bbfe8cb RB |
630 | (minutes (quotient rem 60)) |
631 | (seconds (remainder rem 60))) | |
632 | (make-date (time-nanosecond time) | |
633 | (if leap-second? (+ seconds 1) seconds) | |
634 | minutes | |
635 | hours | |
636 | date | |
637 | month | |
638 | year | |
639 | offset)))))) | |
640 | ||
641 | (define (time-tai->date time . tz-offset) | |
642 | (if (not (eq? (time-type time) time-tai)) | |
abab34ce | 643 | (time-error 'time->date 'incompatible-time-types time)) |
4549ba4a | 644 | (let* ((offset (if (null? tz-offset) |
abab34ce | 645 | (local-tz-offset (time-tai->time-utc time)) |
4549ba4a | 646 | (car tz-offset))) |
5bbfe8cb | 647 | (seconds (- (time-second time) |
abab34ce AW |
648 | (leap-second-delta (time-second time)))) |
649 | (leap-second? (leap-second? (+ offset seconds))) | |
650 | (jdn (time->julian-day-number (if leap-second? | |
5bbfe8cb RB |
651 | (- seconds 1) |
652 | seconds) | |
653 | offset))) | |
abab34ce | 654 | (call-with-values (lambda () (decode-julian-day-number jdn)) |
5bbfe8cb | 655 | (lambda (secs date month year) |
4549ba4a MV |
656 | ;; secs is a real because jdn is a real in Guile; |
657 | ;; but it is conceptionally an integer. | |
5bbfe8cb | 658 | ;; adjust for leap seconds if necessary ... |
4549ba4a MV |
659 | (let* ((int-secs (inexact->exact (round secs))) |
660 | (hours (quotient int-secs (* 60 60))) | |
661 | (rem (remainder int-secs (* 60 60))) | |
5bbfe8cb RB |
662 | (minutes (quotient rem 60)) |
663 | (seconds (remainder rem 60))) | |
664 | (make-date (time-nanosecond time) | |
665 | (if leap-second? (+ seconds 1) seconds) | |
666 | minutes | |
667 | hours | |
668 | date | |
669 | month | |
670 | year | |
671 | offset)))))) | |
672 | ||
673 | ;; this is the same as time-tai->date. | |
674 | (define (time-monotonic->date time . tz-offset) | |
675 | (if (not (eq? (time-type time) time-monotonic)) | |
abab34ce | 676 | (time-error 'time->date 'incompatible-time-types time)) |
4549ba4a | 677 | (let* ((offset (if (null? tz-offset) |
abab34ce | 678 | (local-tz-offset (time-monotonic->time-utc time)) |
4549ba4a | 679 | (car tz-offset))) |
5bbfe8cb | 680 | (seconds (- (time-second time) |
abab34ce AW |
681 | (leap-second-delta (time-second time)))) |
682 | (leap-second? (leap-second? (+ offset seconds))) | |
683 | (jdn (time->julian-day-number (if leap-second? | |
5bbfe8cb RB |
684 | (- seconds 1) |
685 | seconds) | |
686 | offset))) | |
abab34ce | 687 | (call-with-values (lambda () (decode-julian-day-number jdn)) |
5bbfe8cb | 688 | (lambda (secs date month year) |
4549ba4a MV |
689 | ;; secs is a real because jdn is a real in Guile; |
690 | ;; but it is conceptionally an integer. | |
5bbfe8cb | 691 | ;; adjust for leap seconds if necessary ... |
4549ba4a MV |
692 | (let* ((int-secs (inexact->exact (round secs))) |
693 | (hours (quotient int-secs (* 60 60))) | |
694 | (rem (remainder int-secs (* 60 60))) | |
5bbfe8cb RB |
695 | (minutes (quotient rem 60)) |
696 | (seconds (remainder rem 60))) | |
697 | (make-date (time-nanosecond time) | |
698 | (if leap-second? (+ seconds 1) seconds) | |
699 | minutes | |
700 | hours | |
701 | date | |
702 | month | |
703 | year | |
704 | offset)))))) | |
705 | ||
706 | (define (date->time-utc date) | |
abab34ce | 707 | (let* ((jdays (- (encode-julian-day-number (date-day date) |
5bbfe8cb RB |
708 | (date-month date) |
709 | (date-year date)) | |
abab34ce | 710 | tai-epoch-in-jd)) |
4549ba4a MV |
711 | ;; jdays is an integer plus 1/2, |
712 | (jdays-1/2 (inexact->exact (- jdays 1/2)))) | |
afb47f6d | 713 | (make-time |
5bbfe8cb RB |
714 | time-utc |
715 | (date-nanosecond date) | |
4549ba4a | 716 | (+ (* jdays-1/2 24 60 60) |
5bbfe8cb RB |
717 | (* (date-hour date) 60 60) |
718 | (* (date-minute date) 60) | |
4549ba4a MV |
719 | (date-second date) |
720 | (- (date-zone-offset date)))))) | |
5bbfe8cb RB |
721 | |
722 | (define (date->time-tai date) | |
723 | (time-utc->time-tai! (date->time-utc date))) | |
724 | ||
725 | (define (date->time-monotonic date) | |
726 | (time-utc->time-monotonic! (date->time-utc date))) | |
727 | ||
abab34ce | 728 | (define (leap-year? year) |
5bbfe8cb RB |
729 | (or (= (modulo year 400) 0) |
730 | (and (= (modulo year 4) 0) (not (= (modulo year 100) 0))))) | |
5bbfe8cb | 731 | |
359b471e NJ |
732 | ;; Map 1-based month number M to number of days in the year before the |
733 | ;; start of month M (in a non-leap year). | |
abab34ce | 734 | (define month-assoc '((1 . 0) (2 . 31) (3 . 59) (4 . 90) |
359b471e NJ |
735 | (5 . 120) (6 . 151) (7 . 181) (8 . 212) |
736 | (9 . 243) (10 . 273) (11 . 304) (12 . 334))) | |
5bbfe8cb | 737 | |
abab34ce AW |
738 | (define (year-day day month year) |
739 | (let ((days-pr (assoc month month-assoc))) | |
5bbfe8cb | 740 | (if (not days-pr) |
abab34ce AW |
741 | (time-error 'date-year-day 'invalid-month-specification month)) |
742 | (if (and (leap-year? year) (> month 2)) | |
5bbfe8cb RB |
743 | (+ day (cdr days-pr) 1) |
744 | (+ day (cdr days-pr))))) | |
745 | ||
746 | (define (date-year-day date) | |
abab34ce | 747 | (year-day (date-day date) (date-month date) (date-year date))) |
5bbfe8cb | 748 | |
afb47f6d | 749 | ;; from calendar faq |
abab34ce | 750 | (define (week-day day month year) |
5bbfe8cb RB |
751 | (let* ((a (quotient (- 14 month) 12)) |
752 | (y (- year a)) | |
753 | (m (+ month (* 12 a) -2))) | |
754 | (modulo (+ day | |
755 | y | |
756 | (quotient y 4) | |
757 | (- (quotient y 100)) | |
758 | (quotient y 400) | |
759 | (quotient (* 31 m) 12)) | |
760 | 7))) | |
761 | ||
762 | (define (date-week-day date) | |
abab34ce | 763 | (week-day (date-day date) (date-month date) (date-year date))) |
5bbfe8cb | 764 | |
abab34ce | 765 | (define (days-before-first-week date day-of-week-starting-week) |
5bbfe8cb RB |
766 | (let* ((first-day (make-date 0 0 0 0 |
767 | 1 | |
768 | 1 | |
769 | (date-year date) | |
770 | #f)) | |
771 | (fdweek-day (date-week-day first-day))) | |
772 | (modulo (- day-of-week-starting-week fdweek-day) | |
773 | 7))) | |
774 | ||
f3cc3dab KR |
775 | ;; The "-1" here is a fix for the reference implementation, to make a new |
776 | ;; week start on the given day-of-week-starting-week. date-year-day returns | |
777 | ;; a day starting from 1 for 1st Jan. | |
778 | ;; | |
5bbfe8cb RB |
779 | (define (date-week-number date day-of-week-starting-week) |
780 | (quotient (- (date-year-day date) | |
f3cc3dab | 781 | 1 |
abab34ce | 782 | (days-before-first-week date day-of-week-starting-week)) |
5bbfe8cb RB |
783 | 7)) |
784 | ||
afb47f6d | 785 | (define (current-date . tz-offset) |
4549ba4a MV |
786 | (let ((time (current-time time-utc))) |
787 | (time-utc->date | |
788 | time | |
789 | (if (null? tz-offset) | |
abab34ce | 790 | (local-tz-offset time) |
4549ba4a | 791 | (car tz-offset))))) |
5bbfe8cb RB |
792 | |
793 | ;; given a 'two digit' number, find the year within 50 years +/- | |
abab34ce | 794 | (define (natural-year n) |
5bbfe8cb RB |
795 | (let* ((current-year (date-year (current-date))) |
796 | (current-century (* (quotient current-year 100) 100))) | |
797 | (cond | |
798 | ((>= n 100) n) | |
799 | ((< n 0) n) | |
800 | ((<= (- (+ current-century n) current-year) 50) (+ current-century n)) | |
801 | (else (+ (- current-century 100) n))))) | |
802 | ||
803 | (define (date->julian-day date) | |
804 | (let ((nanosecond (date-nanosecond date)) | |
805 | (second (date-second date)) | |
806 | (minute (date-minute date)) | |
807 | (hour (date-hour date)) | |
808 | (day (date-day date)) | |
809 | (month (date-month date)) | |
0867f7ba LC |
810 | (year (date-year date)) |
811 | (offset (date-zone-offset date))) | |
abab34ce | 812 | (+ (encode-julian-day-number day month year) |
5bbfe8cb | 813 | (- 1/2) |
0867f7ba LC |
814 | (+ (/ (+ (- offset) |
815 | (* hour 60 60) | |
5bbfe8cb RB |
816 | (* minute 60) |
817 | second | |
abab34ce AW |
818 | (/ nanosecond nano)) |
819 | sid))))) | |
5bbfe8cb RB |
820 | |
821 | (define (date->modified-julian-day date) | |
822 | (- (date->julian-day date) | |
823 | 4800001/2)) | |
824 | ||
825 | (define (time-utc->julian-day time) | |
826 | (if (not (eq? (time-type time) time-utc)) | |
abab34ce AW |
827 | (time-error 'time->date 'incompatible-time-types time)) |
828 | (+ (/ (+ (time-second time) (/ (time-nanosecond time) nano)) | |
829 | sid) | |
830 | tai-epoch-in-jd)) | |
5bbfe8cb RB |
831 | |
832 | (define (time-utc->modified-julian-day time) | |
833 | (- (time-utc->julian-day time) | |
834 | 4800001/2)) | |
835 | ||
836 | (define (time-tai->julian-day time) | |
837 | (if (not (eq? (time-type time) time-tai)) | |
abab34ce | 838 | (time-error 'time->date 'incompatible-time-types time)) |
afb47f6d | 839 | (+ (/ (+ (- (time-second time) |
abab34ce AW |
840 | (leap-second-delta (time-second time))) |
841 | (/ (time-nanosecond time) nano)) | |
842 | sid) | |
843 | tai-epoch-in-jd)) | |
5bbfe8cb RB |
844 | |
845 | (define (time-tai->modified-julian-day time) | |
846 | (- (time-tai->julian-day time) | |
847 | 4800001/2)) | |
848 | ||
849 | ;; this is the same as time-tai->julian-day | |
850 | (define (time-monotonic->julian-day time) | |
851 | (if (not (eq? (time-type time) time-monotonic)) | |
abab34ce | 852 | (time-error 'time->date 'incompatible-time-types time)) |
afb47f6d | 853 | (+ (/ (+ (- (time-second time) |
abab34ce AW |
854 | (leap-second-delta (time-second time))) |
855 | (/ (time-nanosecond time) nano)) | |
856 | sid) | |
857 | tai-epoch-in-jd)) | |
5bbfe8cb RB |
858 | |
859 | (define (time-monotonic->modified-julian-day time) | |
860 | (- (time-monotonic->julian-day time) | |
861 | 4800001/2)) | |
862 | ||
863 | (define (julian-day->time-utc jdn) | |
abab34ce | 864 | (let ((secs (* sid (- jdn tai-epoch-in-jd)))) |
5bbfe8cb | 865 | (receive (seconds parts) |
abab34ce | 866 | (split-real secs) |
afb47f6d | 867 | (make-time time-utc |
abab34ce | 868 | (* parts nano) |
4549ba4a | 869 | seconds)))) |
5bbfe8cb RB |
870 | |
871 | (define (julian-day->time-tai jdn) | |
872 | (time-utc->time-tai! (julian-day->time-utc jdn))) | |
873 | ||
874 | (define (julian-day->time-monotonic jdn) | |
875 | (time-utc->time-monotonic! (julian-day->time-utc jdn))) | |
876 | ||
877 | (define (julian-day->date jdn . tz-offset) | |
4549ba4a MV |
878 | (let* ((time (julian-day->time-utc jdn)) |
879 | (offset (if (null? tz-offset) | |
abab34ce | 880 | (local-tz-offset time) |
4549ba4a MV |
881 | (car tz-offset)))) |
882 | (time-utc->date time offset))) | |
5bbfe8cb RB |
883 | |
884 | (define (modified-julian-day->date jdn . tz-offset) | |
4549ba4a MV |
885 | (apply julian-day->date (+ jdn 4800001/2) |
886 | tz-offset)) | |
5bbfe8cb RB |
887 | |
888 | (define (modified-julian-day->time-utc jdn) | |
889 | (julian-day->time-utc (+ jdn 4800001/2))) | |
890 | ||
891 | (define (modified-julian-day->time-tai jdn) | |
892 | (julian-day->time-tai (+ jdn 4800001/2))) | |
893 | ||
894 | (define (modified-julian-day->time-monotonic jdn) | |
895 | (julian-day->time-monotonic (+ jdn 4800001/2))) | |
896 | ||
897 | (define (current-julian-day) | |
898 | (time-utc->julian-day (current-time time-utc))) | |
899 | ||
900 | (define (current-modified-julian-day) | |
901 | (time-utc->modified-julian-day (current-time time-utc))) | |
902 | ||
903 | ;; returns a string rep. of number N, of minimum LENGTH, padded with | |
904 | ;; character PAD-WITH. If PAD-WITH is #f, no padding is done, and it's | |
905 | ;; as if number->string was used. if string is longer than or equal | |
906 | ;; in length to LENGTH, it's as if number->string was used. | |
907 | ||
abab34ce | 908 | (define (padding n pad-with length) |
5bbfe8cb RB |
909 | (let* ((str (number->string n)) |
910 | (str-len (string-length str))) | |
911 | (if (or (>= str-len length) | |
912 | (not pad-with)) | |
913 | str | |
914 | (string-append (make-string (- length str-len) pad-with) str)))) | |
915 | ||
abab34ce | 916 | (define (last-n-digits i n) |
5bbfe8cb RB |
917 | (abs (remainder i (expt 10 n)))) |
918 | ||
abab34ce AW |
919 | (define (locale-abbr-weekday n) (locale-day-short (+ 1 n))) |
920 | (define (locale-long-weekday n) (locale-day (+ 1 n))) | |
921 | (define locale-abbr-month locale-month-short) | |
922 | (define locale-long-month locale-month) | |
a2f00b9b | 923 | |
abab34ce | 924 | (define (date-reverse-lookup needle haystack-ref haystack-len |
a2f00b9b LC |
925 | same?) |
926 | ;; Lookup NEEDLE (a string) using HAYSTACK-REF (a one argument procedure | |
927 | ;; that returns a string corresponding to the given index) by passing it | |
928 | ;; indices lower than HAYSTACK-LEN. | |
929 | (let loop ((index 1)) | |
930 | (cond ((> index haystack-len) #f) | |
931 | ((same? needle (haystack-ref index)) | |
932 | index) | |
933 | (else (loop (+ index 1)))))) | |
5bbfe8cb | 934 | |
abab34ce AW |
935 | (define (locale-abbr-weekday->index string) |
936 | (date-reverse-lookup string locale-day-short 7 string=?)) | |
5bbfe8cb | 937 | |
abab34ce AW |
938 | (define (locale-long-weekday->index string) |
939 | (date-reverse-lookup string locale-day 7 string=?)) | |
5bbfe8cb | 940 | |
abab34ce AW |
941 | (define (locale-abbr-month->index string) |
942 | (date-reverse-lookup string locale-abbr-month 12 string=?)) | |
5bbfe8cb | 943 | |
abab34ce AW |
944 | (define (locale-long-month->index string) |
945 | (date-reverse-lookup string locale-long-month 12 string=?)) | |
5bbfe8cb RB |
946 | |
947 | ||
4549ba4a MV |
948 | ;; FIXME: mkoeppe: Put a symbolic time zone in the date structs. |
949 | ;; Print it here instead of the numerical offset if available. | |
abab34ce AW |
950 | (define (locale-print-time-zone date port) |
951 | (tz-printer (date-zone-offset date) port)) | |
5bbfe8cb | 952 | |
abab34ce AW |
953 | (define (locale-am-string/pm hr) |
954 | (if (> hr 11) (locale-pm-string) (locale-am-string))) | |
5bbfe8cb | 955 | |
abab34ce | 956 | (define (tz-printer offset port) |
5bbfe8cb RB |
957 | (cond |
958 | ((= offset 0) (display "Z" port)) | |
959 | ((negative? offset) (display "-" port)) | |
960 | (else (display "+" port))) | |
961 | (if (not (= offset 0)) | |
962 | (let ((hours (abs (quotient offset (* 60 60)))) | |
963 | (minutes (abs (quotient (remainder offset (* 60 60)) 60)))) | |
abab34ce AW |
964 | (display (padding hours #\0 2) port) |
965 | (display (padding minutes #\0 2) port)))) | |
5bbfe8cb | 966 | |
5bbfe8cb RB |
967 | ;; A table of output formatting directives. |
968 | ;; the first time is the format char. | |
969 | ;; the second is a procedure that takes the date, a padding character | |
970 | ;; (which might be #f), and the output port. | |
971 | ;; | |
abab34ce | 972 | (define directives |
5bbfe8cb RB |
973 | (list |
974 | (cons #\~ (lambda (date pad-with port) | |
975 | (display #\~ port))) | |
976 | (cons #\a (lambda (date pad-with port) | |
abab34ce | 977 | (display (locale-abbr-weekday (date-week-day date)) |
5bbfe8cb RB |
978 | port))) |
979 | (cons #\A (lambda (date pad-with port) | |
abab34ce | 980 | (display (locale-long-weekday (date-week-day date)) |
5bbfe8cb RB |
981 | port))) |
982 | (cons #\b (lambda (date pad-with port) | |
abab34ce | 983 | (display (locale-abbr-month (date-month date)) |
5bbfe8cb RB |
984 | port))) |
985 | (cons #\B (lambda (date pad-with port) | |
abab34ce | 986 | (display (locale-long-month (date-month date)) |
5bbfe8cb RB |
987 | port))) |
988 | (cons #\c (lambda (date pad-with port) | |
abab34ce | 989 | (display (date->string date locale-date-time-format) port))) |
5bbfe8cb | 990 | (cons #\d (lambda (date pad-with port) |
abab34ce | 991 | (display (padding (date-day date) |
5bbfe8cb RB |
992 | #\0 2) |
993 | port))) | |
994 | (cons #\D (lambda (date pad-with port) | |
995 | (display (date->string date "~m/~d/~y") port))) | |
996 | (cons #\e (lambda (date pad-with port) | |
abab34ce | 997 | (display (padding (date-day date) |
5bbfe8cb RB |
998 | #\Space 2) |
999 | port))) | |
1000 | (cons #\f (lambda (date pad-with port) | |
1001 | (if (> (date-nanosecond date) | |
abab34ce AW |
1002 | nano) |
1003 | (display (padding (+ (date-second date) 1) | |
5bbfe8cb RB |
1004 | pad-with 2) |
1005 | port) | |
abab34ce | 1006 | (display (padding (date-second date) |
5bbfe8cb RB |
1007 | pad-with 2) |
1008 | port)) | |
afb47f6d | 1009 | (receive (i f) |
abab34ce | 1010 | (split-real (/ |
5bbfe8cb | 1011 | (date-nanosecond date) |
abab34ce | 1012 | nano 1.0)) |
5bbfe8cb RB |
1013 | (let* ((ns (number->string f)) |
1014 | (le (string-length ns))) | |
1015 | (if (> le 2) | |
1016 | (begin | |
abab34ce | 1017 | (display (locale-decimal-point) port) |
5bbfe8cb RB |
1018 | (display (substring ns 2 le) port))))))) |
1019 | (cons #\h (lambda (date pad-with port) | |
1020 | (display (date->string date "~b") port))) | |
1021 | (cons #\H (lambda (date pad-with port) | |
abab34ce | 1022 | (display (padding (date-hour date) |
5bbfe8cb RB |
1023 | pad-with 2) |
1024 | port))) | |
1025 | (cons #\I (lambda (date pad-with port) | |
1026 | (let ((hr (date-hour date))) | |
1027 | (if (> hr 12) | |
abab34ce | 1028 | (display (padding (- hr 12) |
5bbfe8cb RB |
1029 | pad-with 2) |
1030 | port) | |
abab34ce | 1031 | (display (padding hr |
5bbfe8cb RB |
1032 | pad-with 2) |
1033 | port))))) | |
1034 | (cons #\j (lambda (date pad-with port) | |
abab34ce | 1035 | (display (padding (date-year-day date) |
5bbfe8cb RB |
1036 | pad-with 3) |
1037 | port))) | |
1038 | (cons #\k (lambda (date pad-with port) | |
abab34ce | 1039 | (display (padding (date-hour date) |
5bbfe8cb RB |
1040 | #\Space 2) |
1041 | port))) | |
1042 | (cons #\l (lambda (date pad-with port) | |
1043 | (let ((hr (if (> (date-hour date) 12) | |
1044 | (- (date-hour date) 12) (date-hour date)))) | |
abab34ce | 1045 | (display (padding hr #\Space 2) |
5bbfe8cb RB |
1046 | port)))) |
1047 | (cons #\m (lambda (date pad-with port) | |
abab34ce | 1048 | (display (padding (date-month date) |
5bbfe8cb RB |
1049 | pad-with 2) |
1050 | port))) | |
1051 | (cons #\M (lambda (date pad-with port) | |
abab34ce | 1052 | (display (padding (date-minute date) |
5bbfe8cb RB |
1053 | pad-with 2) |
1054 | port))) | |
1055 | (cons #\n (lambda (date pad-with port) | |
1056 | (newline port))) | |
1057 | (cons #\N (lambda (date pad-with port) | |
abab34ce | 1058 | (display (padding (date-nanosecond date) |
5bbfe8cb RB |
1059 | pad-with 7) |
1060 | port))) | |
1061 | (cons #\p (lambda (date pad-with port) | |
abab34ce | 1062 | (display (locale-am-string/pm (date-hour date)) port))) |
5bbfe8cb RB |
1063 | (cons #\r (lambda (date pad-with port) |
1064 | (display (date->string date "~I:~M:~S ~p") port))) | |
1065 | (cons #\s (lambda (date pad-with port) | |
1066 | (display (time-second (date->time-utc date)) port))) | |
1067 | (cons #\S (lambda (date pad-with port) | |
1068 | (if (> (date-nanosecond date) | |
abab34ce AW |
1069 | nano) |
1070 | (display (padding (+ (date-second date) 1) | |
5bbfe8cb RB |
1071 | pad-with 2) |
1072 | port) | |
abab34ce | 1073 | (display (padding (date-second date) |
5bbfe8cb RB |
1074 | pad-with 2) |
1075 | port)))) | |
1076 | (cons #\t (lambda (date pad-with port) | |
1077 | (display #\Tab port))) | |
1078 | (cons #\T (lambda (date pad-with port) | |
1079 | (display (date->string date "~H:~M:~S") port))) | |
1080 | (cons #\U (lambda (date pad-with port) | |
abab34ce AW |
1081 | (if (> (days-before-first-week date 0) 0) |
1082 | (display (padding (+ (date-week-number date 0) 1) | |
5bbfe8cb | 1083 | #\0 2) port) |
abab34ce | 1084 | (display (padding (date-week-number date 0) |
5bbfe8cb RB |
1085 | #\0 2) port)))) |
1086 | (cons #\V (lambda (date pad-with port) | |
abab34ce | 1087 | (display (padding (date-week-number date 1) |
5bbfe8cb RB |
1088 | #\0 2) port))) |
1089 | (cons #\w (lambda (date pad-with port) | |
1090 | (display (date-week-day date) port))) | |
1091 | (cons #\x (lambda (date pad-with port) | |
abab34ce | 1092 | (display (date->string date locale-short-date-format) port))) |
5bbfe8cb | 1093 | (cons #\X (lambda (date pad-with port) |
abab34ce | 1094 | (display (date->string date locale-time-format) port))) |
5bbfe8cb | 1095 | (cons #\W (lambda (date pad-with port) |
abab34ce AW |
1096 | (if (> (days-before-first-week date 1) 0) |
1097 | (display (padding (+ (date-week-number date 1) 1) | |
5bbfe8cb | 1098 | #\0 2) port) |
abab34ce | 1099 | (display (padding (date-week-number date 1) |
5bbfe8cb RB |
1100 | #\0 2) port)))) |
1101 | (cons #\y (lambda (date pad-with port) | |
abab34ce | 1102 | (display (padding (last-n-digits |
5bbfe8cb RB |
1103 | (date-year date) 2) |
1104 | pad-with | |
1105 | 2) | |
1106 | port))) | |
1107 | (cons #\Y (lambda (date pad-with port) | |
1108 | (display (date-year date) port))) | |
1109 | (cons #\z (lambda (date pad-with port) | |
abab34ce | 1110 | (tz-printer (date-zone-offset date) port))) |
5bbfe8cb | 1111 | (cons #\Z (lambda (date pad-with port) |
abab34ce | 1112 | (locale-print-time-zone date port))) |
5bbfe8cb RB |
1113 | (cons #\1 (lambda (date pad-with port) |
1114 | (display (date->string date "~Y-~m-~d") port))) | |
1115 | (cons #\2 (lambda (date pad-with port) | |
d6bd1826 | 1116 | (display (date->string date "~H:~M:~S~z") port))) |
5bbfe8cb | 1117 | (cons #\3 (lambda (date pad-with port) |
d6bd1826 | 1118 | (display (date->string date "~H:~M:~S") port))) |
5bbfe8cb | 1119 | (cons #\4 (lambda (date pad-with port) |
d6bd1826 | 1120 | (display (date->string date "~Y-~m-~dT~H:~M:~S~z") port))) |
5bbfe8cb | 1121 | (cons #\5 (lambda (date pad-with port) |
d6bd1826 | 1122 | (display (date->string date "~Y-~m-~dT~H:~M:~S") port))))) |
5bbfe8cb RB |
1123 | |
1124 | ||
abab34ce AW |
1125 | (define (get-formatter char) |
1126 | (let ((associated (assoc char directives))) | |
5bbfe8cb RB |
1127 | (if associated (cdr associated) #f))) |
1128 | ||
abab34ce | 1129 | (define (date-printer date index format-string str-len port) |
0a283d1b | 1130 | (if (< index str-len) |
5bbfe8cb RB |
1131 | (let ((current-char (string-ref format-string index))) |
1132 | (if (not (char=? current-char #\~)) | |
1133 | (begin | |
1134 | (display current-char port) | |
abab34ce | 1135 | (date-printer date (+ index 1) format-string str-len port)) |
5bbfe8cb | 1136 | (if (= (+ index 1) str-len) ; bad format string. |
abab34ce | 1137 | (time-error 'date-printer 'bad-date-format-string |
5bbfe8cb RB |
1138 | format-string) |
1139 | (let ((pad-char? (string-ref format-string (+ index 1)))) | |
1140 | (cond | |
1141 | ((char=? pad-char? #\-) | |
1142 | (if (= (+ index 2) str-len) ; bad format string. | |
abab34ce | 1143 | (time-error 'date-printer |
afb47f6d | 1144 | 'bad-date-format-string |
5bbfe8cb | 1145 | format-string) |
abab34ce | 1146 | (let ((formatter (get-formatter |
5bbfe8cb RB |
1147 | (string-ref format-string |
1148 | (+ index 2))))) | |
1149 | (if (not formatter) | |
abab34ce | 1150 | (time-error 'date-printer |
afb47f6d | 1151 | 'bad-date-format-string |
5bbfe8cb RB |
1152 | format-string) |
1153 | (begin | |
1154 | (formatter date #f port) | |
abab34ce | 1155 | (date-printer date |
5bbfe8cb RB |
1156 | (+ index 3) |
1157 | format-string | |
1158 | str-len | |
1159 | port)))))) | |
afb47f6d | 1160 | |
5bbfe8cb RB |
1161 | ((char=? pad-char? #\_) |
1162 | (if (= (+ index 2) str-len) ; bad format string. | |
abab34ce | 1163 | (time-error 'date-printer |
afb47f6d | 1164 | 'bad-date-format-string |
5bbfe8cb | 1165 | format-string) |
abab34ce | 1166 | (let ((formatter (get-formatter |
5bbfe8cb RB |
1167 | (string-ref format-string |
1168 | (+ index 2))))) | |
1169 | (if (not formatter) | |
abab34ce | 1170 | (time-error 'date-printer |
afb47f6d | 1171 | 'bad-date-format-string |
5bbfe8cb RB |
1172 | format-string) |
1173 | (begin | |
1174 | (formatter date #\Space port) | |
abab34ce | 1175 | (date-printer date |
5bbfe8cb RB |
1176 | (+ index 3) |
1177 | format-string | |
1178 | str-len | |
1179 | port)))))) | |
1180 | (else | |
abab34ce | 1181 | (let ((formatter (get-formatter |
5bbfe8cb RB |
1182 | (string-ref format-string |
1183 | (+ index 1))))) | |
1184 | (if (not formatter) | |
abab34ce | 1185 | (time-error 'date-printer |
afb47f6d | 1186 | 'bad-date-format-string |
5bbfe8cb RB |
1187 | format-string) |
1188 | (begin | |
1189 | (formatter date #\0 port) | |
abab34ce | 1190 | (date-printer date |
5bbfe8cb RB |
1191 | (+ index 2) |
1192 | format-string | |
1193 | str-len | |
1194 | port)))))))))))) | |
1195 | ||
1196 | ||
1197 | (define (date->string date . format-string) | |
1198 | (let ((str-port (open-output-string)) | |
5e1fb41f | 1199 | (fmt-str (if (null? format-string) "~c" (car format-string)))) |
abab34ce | 1200 | (date-printer date 0 fmt-str (string-length fmt-str) str-port) |
5bbfe8cb RB |
1201 | (get-output-string str-port))) |
1202 | ||
abab34ce | 1203 | (define (char->int ch) |
5bbfe8cb RB |
1204 | (case ch |
1205 | ((#\0) 0) | |
1206 | ((#\1) 1) | |
1207 | ((#\2) 2) | |
1208 | ((#\3) 3) | |
1209 | ((#\4) 4) | |
1210 | ((#\5) 5) | |
1211 | ((#\6) 6) | |
1212 | ((#\7) 7) | |
1213 | ((#\8) 8) | |
1214 | ((#\9) 9) | |
abab34ce | 1215 | (else (time-error 'char->int 'bad-date-template-string |
84012ef4 | 1216 | (list "Non-integer character" ch))))) |
5bbfe8cb RB |
1217 | |
1218 | ;; read an integer upto n characters long on port; upto -> #f is any length | |
abab34ce | 1219 | (define (integer-reader upto port) |
5bbfe8cb RB |
1220 | (let loop ((accum 0) (nchars 0)) |
1221 | (let ((ch (peek-char port))) | |
1222 | (if (or (eof-object? ch) | |
1223 | (not (char-numeric? ch)) | |
1224 | (and upto (>= nchars upto))) | |
1225 | accum | |
abab34ce | 1226 | (loop (+ (* accum 10) (char->int (read-char port))) |
5bbfe8cb RB |
1227 | (+ nchars 1)))))) |
1228 | ||
abab34ce | 1229 | (define (make-integer-reader upto) |
5bbfe8cb | 1230 | (lambda (port) |
abab34ce | 1231 | (integer-reader upto port))) |
5bbfe8cb RB |
1232 | |
1233 | ;; read *exactly* n characters and convert to integer; could be padded | |
abab34ce | 1234 | (define (integer-reader-exact n port) |
5bbfe8cb RB |
1235 | (let ((padding-ok #t)) |
1236 | (define (accum-int port accum nchars) | |
1237 | (let ((ch (peek-char port))) | |
5a1920de RB |
1238 | (cond |
1239 | ((>= nchars n) accum) | |
afb47f6d | 1240 | ((eof-object? ch) |
abab34ce | 1241 | (time-error 'string->date 'bad-date-template-string |
5bbfe8cb | 1242 | "Premature ending to integer read.")) |
5a1920de RB |
1243 | ((char-numeric? ch) |
1244 | (set! padding-ok #f) | |
1245 | (accum-int port | |
abab34ce | 1246 | (+ (* accum 10) (char->int (read-char port))) |
5a1920de RB |
1247 | (+ nchars 1))) |
1248 | (padding-ok | |
1249 | (read-char port) ; consume padding | |
1250 | (accum-int port accum (+ nchars 1))) | |
1251 | (else ; padding where it shouldn't be | |
abab34ce | 1252 | (time-error 'string->date 'bad-date-template-string |
5bbfe8cb RB |
1253 | "Non-numeric characters in integer read."))))) |
1254 | (accum-int port 0 0))) | |
1255 | ||
1256 | ||
abab34ce | 1257 | (define (make-integer-exact-reader n) |
5bbfe8cb | 1258 | (lambda (port) |
abab34ce | 1259 | (integer-reader-exact n port))) |
5bbfe8cb | 1260 | |
abab34ce | 1261 | (define (zone-reader port) |
afb47f6d | 1262 | (let ((offset 0) |
5bbfe8cb RB |
1263 | (positive? #f)) |
1264 | (let ((ch (read-char port))) | |
1265 | (if (eof-object? ch) | |
abab34ce | 1266 | (time-error 'string->date 'bad-date-template-string |
5bbfe8cb RB |
1267 | (list "Invalid time zone +/-" ch))) |
1268 | (if (or (char=? ch #\Z) (char=? ch #\z)) | |
1269 | 0 | |
1270 | (begin | |
1271 | (cond | |
1272 | ((char=? ch #\+) (set! positive? #t)) | |
1273 | ((char=? ch #\-) (set! positive? #f)) | |
1274 | (else | |
abab34ce | 1275 | (time-error 'string->date 'bad-date-template-string |
5bbfe8cb RB |
1276 | (list "Invalid time zone +/-" ch)))) |
1277 | (let ((ch (read-char port))) | |
1278 | (if (eof-object? ch) | |
abab34ce | 1279 | (time-error 'string->date 'bad-date-template-string |
5bbfe8cb | 1280 | (list "Invalid time zone number" ch))) |
abab34ce | 1281 | (set! offset (* (char->int ch) |
5bbfe8cb RB |
1282 | 10 60 60))) |
1283 | (let ((ch (read-char port))) | |
1284 | (if (eof-object? ch) | |
abab34ce | 1285 | (time-error 'string->date 'bad-date-template-string |
5bbfe8cb | 1286 | (list "Invalid time zone number" ch))) |
abab34ce | 1287 | (set! offset (+ offset (* (char->int ch) |
5bbfe8cb RB |
1288 | 60 60)))) |
1289 | (let ((ch (read-char port))) | |
1290 | (if (eof-object? ch) | |
abab34ce | 1291 | (time-error 'string->date 'bad-date-template-string |
5bbfe8cb | 1292 | (list "Invalid time zone number" ch))) |
abab34ce | 1293 | (set! offset (+ offset (* (char->int ch) |
5bbfe8cb RB |
1294 | 10 60)))) |
1295 | (let ((ch (read-char port))) | |
1296 | (if (eof-object? ch) | |
abab34ce | 1297 | (time-error 'string->date 'bad-date-template-string |
5bbfe8cb | 1298 | (list "Invalid time zone number" ch))) |
abab34ce | 1299 | (set! offset (+ offset (* (char->int ch) |
5bbfe8cb RB |
1300 | 60)))) |
1301 | (if positive? offset (- offset))))))) | |
1302 | ||
1303 | ;; looking at a char, read the char string, run thru indexer, return index | |
abab34ce | 1304 | (define (locale-reader port indexer) |
b4d2a48e RB |
1305 | |
1306 | (define (read-char-string result) | |
1307 | (let ((ch (peek-char port))) | |
1308 | (if (char-alphabetic? ch) | |
1309 | (read-char-string (cons (read-char port) result)) | |
1310 | (list->string (reverse! result))))) | |
afb47f6d TTN |
1311 | |
1312 | (let* ((str (read-char-string '())) | |
b4d2a48e | 1313 | (index (indexer str))) |
abab34ce | 1314 | (if index index (time-error 'string->date |
b4d2a48e RB |
1315 | 'bad-date-template-string |
1316 | (list "Invalid string for " indexer))))) | |
5bbfe8cb | 1317 | |
abab34ce | 1318 | (define (make-locale-reader indexer) |
5bbfe8cb | 1319 | (lambda (port) |
abab34ce | 1320 | (locale-reader port indexer))) |
5bbfe8cb | 1321 | |
abab34ce | 1322 | (define (make-char-id-reader char) |
5bbfe8cb RB |
1323 | (lambda (port) |
1324 | (if (char=? char (read-char port)) | |
1325 | char | |
abab34ce | 1326 | (time-error 'string->date |
5bbfe8cb RB |
1327 | 'bad-date-template-string |
1328 | "Invalid character match.")))) | |
1329 | ||
1330 | ;; A List of formatted read directives. | |
1331 | ;; Each entry is a list. | |
afb47f6d | 1332 | ;; 1. the character directive; |
5bbfe8cb RB |
1333 | ;; a procedure, which takes a character as input & returns |
1334 | ;; 2. #t as soon as a character on the input port is acceptable | |
1335 | ;; for input, | |
1336 | ;; 3. a port reader procedure that knows how to read the current port | |
1337 | ;; for a value. Its one parameter is the port. | |
0a283d1b AW |
1338 | ;; 4. an optional action procedure, that takes the value (from 3.) and |
1339 | ;; some object (here, always the date) and (probably) side-effects it. | |
1340 | ;; If no action is required, as with ~A, this element may be #f. | |
5bbfe8cb | 1341 | |
abab34ce AW |
1342 | (define read-directives |
1343 | (let ((ireader4 (make-integer-reader 4)) | |
1344 | (ireader2 (make-integer-reader 2)) | |
1345 | (eireader2 (make-integer-exact-reader 2)) | |
1346 | (locale-reader-abbr-weekday (make-locale-reader | |
1347 | locale-abbr-weekday->index)) | |
1348 | (locale-reader-long-weekday (make-locale-reader | |
1349 | locale-long-weekday->index)) | |
1350 | (locale-reader-abbr-month (make-locale-reader | |
1351 | locale-abbr-month->index)) | |
1352 | (locale-reader-long-month (make-locale-reader | |
1353 | locale-long-month->index)) | |
0a283d1b | 1354 | (char-fail (lambda (ch) #t))) |
afb47f6d | 1355 | |
5bbfe8cb | 1356 | (list |
abab34ce | 1357 | (list #\~ char-fail (make-char-id-reader #\~) #f) |
0a283d1b AW |
1358 | (list #\a char-alphabetic? locale-reader-abbr-weekday #f) |
1359 | (list #\A char-alphabetic? locale-reader-long-weekday #f) | |
5bbfe8cb RB |
1360 | (list #\b char-alphabetic? locale-reader-abbr-month |
1361 | (lambda (val object) | |
4549ba4a | 1362 | (set-date-month! object val))) |
5bbfe8cb RB |
1363 | (list #\B char-alphabetic? locale-reader-long-month |
1364 | (lambda (val object) | |
4549ba4a | 1365 | (set-date-month! object val))) |
5bbfe8cb | 1366 | (list #\d char-numeric? ireader2 (lambda (val object) |
4549ba4a | 1367 | (set-date-day! |
5bbfe8cb RB |
1368 | object val))) |
1369 | (list #\e char-fail eireader2 (lambda (val object) | |
4549ba4a | 1370 | (set-date-day! object val))) |
5bbfe8cb RB |
1371 | (list #\h char-alphabetic? locale-reader-abbr-month |
1372 | (lambda (val object) | |
4549ba4a | 1373 | (set-date-month! object val))) |
5bbfe8cb | 1374 | (list #\H char-numeric? ireader2 (lambda (val object) |
4549ba4a | 1375 | (set-date-hour! object val))) |
5bbfe8cb | 1376 | (list #\k char-fail eireader2 (lambda (val object) |
4549ba4a | 1377 | (set-date-hour! object val))) |
5bbfe8cb | 1378 | (list #\m char-numeric? ireader2 (lambda (val object) |
4549ba4a | 1379 | (set-date-month! object val))) |
5bbfe8cb | 1380 | (list #\M char-numeric? ireader2 (lambda (val object) |
4549ba4a | 1381 | (set-date-minute! |
5bbfe8cb RB |
1382 | object val))) |
1383 | (list #\S char-numeric? ireader2 (lambda (val object) | |
4549ba4a | 1384 | (set-date-second! object val))) |
afb47f6d | 1385 | (list #\y char-fail eireader2 |
5bbfe8cb | 1386 | (lambda (val object) |
abab34ce | 1387 | (set-date-year! object (natural-year val)))) |
5bbfe8cb | 1388 | (list #\Y char-numeric? ireader4 (lambda (val object) |
4549ba4a | 1389 | (set-date-year! object val))) |
5bbfe8cb RB |
1390 | (list #\z (lambda (c) |
1391 | (or (char=? c #\Z) | |
1392 | (char=? c #\z) | |
1393 | (char=? c #\+) | |
1394 | (char=? c #\-))) | |
abab34ce | 1395 | zone-reader (lambda (val object) |
4549ba4a | 1396 | (set-date-zone-offset! object val)))))) |
5bbfe8cb RB |
1397 | |
1398 | (define (priv:string->date date index format-string str-len port template-string) | |
1399 | (define (skip-until port skipper) | |
1400 | (let ((ch (peek-char port))) | |
39321905 | 1401 | (if (eof-object? ch) |
abab34ce | 1402 | (time-error 'string->date 'bad-date-format-string template-string) |
5bbfe8cb RB |
1403 | (if (not (skipper ch)) |
1404 | (begin (read-char port) (skip-until port skipper)))))) | |
0a283d1b | 1405 | (if (< index str-len) |
5bbfe8cb RB |
1406 | (let ((current-char (string-ref format-string index))) |
1407 | (if (not (char=? current-char #\~)) | |
1408 | (let ((port-char (read-char port))) | |
1409 | (if (or (eof-object? port-char) | |
1410 | (not (char=? current-char port-char))) | |
abab34ce | 1411 | (time-error 'string->date |
5bbfe8cb RB |
1412 | 'bad-date-format-string template-string)) |
1413 | (priv:string->date date | |
1414 | (+ index 1) | |
1415 | format-string | |
1416 | str-len | |
1417 | port | |
1418 | template-string)) | |
1419 | ;; otherwise, it's an escape, we hope | |
1420 | (if (> (+ index 1) str-len) | |
abab34ce | 1421 | (time-error 'string->date |
5bbfe8cb RB |
1422 | 'bad-date-format-string template-string) |
1423 | (let* ((format-char (string-ref format-string (+ index 1))) | |
abab34ce | 1424 | (format-info (assoc format-char read-directives))) |
5bbfe8cb | 1425 | (if (not format-info) |
abab34ce | 1426 | (time-error 'string->date |
5bbfe8cb RB |
1427 | 'bad-date-format-string template-string) |
1428 | (begin | |
1429 | (let ((skipper (cadr format-info)) | |
1430 | (reader (caddr format-info)) | |
1431 | (actor (cadddr format-info))) | |
1432 | (skip-until port skipper) | |
1433 | (let ((val (reader port))) | |
1434 | (if (eof-object? val) | |
abab34ce | 1435 | (time-error 'string->date |
5bbfe8cb RB |
1436 | 'bad-date-format-string |
1437 | template-string) | |
0a283d1b | 1438 | (if actor (actor val date)))) |
5bbfe8cb RB |
1439 | (priv:string->date date |
1440 | (+ index 2) | |
afb47f6d | 1441 | format-string |
5bbfe8cb RB |
1442 | str-len |
1443 | port | |
1444 | template-string)))))))))) | |
1445 | ||
1446 | (define (string->date input-string template-string) | |
abab34ce | 1447 | (define (date-ok? date) |
5bbfe8cb RB |
1448 | (and (date-nanosecond date) |
1449 | (date-second date) | |
1450 | (date-minute date) | |
1451 | (date-hour date) | |
1452 | (date-day date) | |
1453 | (date-month date) | |
1454 | (date-year date) | |
1455 | (date-zone-offset date))) | |
4549ba4a | 1456 | (let ((newdate (make-date 0 0 0 0 #f #f #f #f))) |
5bbfe8cb RB |
1457 | (priv:string->date newdate |
1458 | 0 | |
1459 | template-string | |
1460 | (string-length template-string) | |
1461 | (open-input-string input-string) | |
1462 | template-string) | |
4549ba4a MV |
1463 | (if (not (date-zone-offset newdate)) |
1464 | (begin | |
1465 | ;; this is necessary to get DST right -- as far as we can | |
1466 | ;; get it right (think of the double/missing hour in the | |
1467 | ;; night when we are switching between normal time and DST). | |
1468 | (set-date-zone-offset! newdate | |
abab34ce | 1469 | (local-tz-offset |
4549ba4a MV |
1470 | (make-time time-utc 0 0))) |
1471 | (set-date-zone-offset! newdate | |
abab34ce | 1472 | (local-tz-offset |
4549ba4a | 1473 | (date->time-utc newdate))))) |
abab34ce | 1474 | (if (date-ok? newdate) |
5bbfe8cb | 1475 | newdate |
abab34ce | 1476 | (time-error |
5bbfe8cb RB |
1477 | 'string->date |
1478 | 'bad-date-format-string | |
1479 | (list "Incomplete date read. " newdate template-string))))) | |
afb47f6d TTN |
1480 | |
1481 | ;;; srfi-19.scm ends here |