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6be07c52 TTN |
1 | ;;; srfi-19.scm --- Time/Date Library |
2 | ||
73e2a8d1 | 3 | ;; Copyright (C) 2001, 2002, 2003, 2005 Free Software Foundation, Inc. |
6be07c52 | 4 | ;; |
73be1d9e MV |
5 | ;; This library is free software; you can redistribute it and/or |
6 | ;; modify it under the terms of the GNU Lesser General Public | |
7 | ;; License as published by the Free Software Foundation; either | |
8 | ;; version 2.1 of the License, or (at your option) any later version. | |
9 | ;; | |
10 | ;; This library is distributed in the hope that it will be useful, | |
6be07c52 TTN |
11 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
73be1d9e MV |
13 | ;; Lesser General Public License for more details. |
14 | ;; | |
15 | ;; You should have received a copy of the GNU Lesser General Public | |
16 | ;; License along with this library; if not, write to the Free Software | |
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 | |
36 | ;; (PRIV:LOCALE-PRINT-TIME-ZONE) can't be implemented sensibly. The | |
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) | |
4c4185ee MG |
44 | :use-module (srfi srfi-9)) |
45 | ||
46 | (begin-deprecated | |
47 | ;; Prevent `export' from re-exporting core bindings. This behaviour | |
48 | ;; of `export' is deprecated and will disappear in one of the next | |
49 | ;; releases. | |
50 | (define current-time #f)) | |
51 | ||
52 | (export ;; Constants | |
5bbfe8cb RB |
53 | time-duration |
54 | time-monotonic | |
55 | time-process | |
56 | time-tai | |
57 | time-thread | |
58 | time-utc | |
59 | ;; Current time and clock resolution | |
60 | current-date | |
61 | current-julian-day | |
62 | current-modified-julian-day | |
63 | current-time | |
64 | time-resolution | |
65 | ;; Time object and accessors | |
66 | make-time | |
67 | time? | |
68 | time-type | |
69 | time-nanosecond | |
70 | time-second | |
71 | set-time-type! | |
72 | set-time-nanosecond! | |
73 | set-time-second! | |
74 | copy-time | |
75 | ;; Time comparison procedures | |
76 | time<=? | |
77 | time<? | |
78 | time=? | |
79 | time>=? | |
80 | time>? | |
81 | ;; Time arithmetic procedures | |
82 | time-difference | |
83 | time-difference! | |
84 | add-duration | |
85 | add-duration! | |
86 | subtract-duration | |
87 | subtract-duration! | |
88 | ;; Date object and accessors | |
89 | make-date | |
90 | date? | |
91 | date-nanosecond | |
92 | date-second | |
93 | date-minute | |
94 | date-hour | |
95 | date-day | |
96 | date-month | |
97 | date-year | |
4549ba4a | 98 | date-zone-offset |
5bbfe8cb RB |
99 | date-year-day |
100 | date-week-day | |
101 | date-week-number | |
102 | ;; Time/Date/Julian Day/Modified Julian Day converters | |
103 | date->julian-day | |
104 | date->modified-julian-day | |
105 | date->time-monotonic | |
106 | date->time-tai | |
107 | date->time-utc | |
108 | julian-day->date | |
109 | julian-day->time-monotonic | |
110 | julian-day->time-tai | |
111 | julian-day->time-utc | |
112 | modified-julian-day->date | |
113 | modified-julian-day->time-monotonic | |
114 | modified-julian-day->time-tai | |
115 | modified-julian-day->time-utc | |
116 | time-monotonic->date | |
5bbfe8cb RB |
117 | time-monotonic->time-tai |
118 | time-monotonic->time-tai! | |
119 | time-monotonic->time-utc | |
120 | time-monotonic->time-utc! | |
121 | time-tai->date | |
122 | time-tai->julian-day | |
123 | time-tai->modified-julian-day | |
124 | time-tai->time-monotonic | |
125 | time-tai->time-monotonic! | |
126 | time-tai->time-utc | |
127 | time-tai->time-utc! | |
128 | time-utc->date | |
129 | time-utc->julian-day | |
130 | time-utc->modified-julian-day | |
131 | time-utc->time-monotonic | |
132 | time-utc->time-monotonic! | |
133 | time-utc->time-tai | |
134 | time-utc->time-tai! | |
135 | ;; Date to string/string to date converters. | |
136 | date->string | |
4c4185ee | 137 | string->date) |
5bbfe8cb | 138 | |
1b2f40b9 MG |
139 | (cond-expand-provide (current-module) '(srfi-19)) |
140 | ||
5bbfe8cb RB |
141 | (define time-tai 'time-tai) |
142 | (define time-utc 'time-utc) | |
143 | (define time-monotonic 'time-monotonic) | |
144 | (define time-thread 'time-thread) | |
145 | (define time-process 'time-process) | |
146 | (define time-duration 'time-duration) | |
147 | ||
148 | ;; FIXME: do we want to add gc time? | |
149 | ;; (define time-gc 'time-gc) | |
150 | ||
151 | ;;-- LOCALE dependent constants | |
152 | ||
153 | (define priv:locale-number-separator ".") | |
154 | ||
155 | (define priv:locale-abbr-weekday-vector | |
afb47f6d | 156 | (vector "Sun" "Mon" "Tue" "Wed" "Thu" "Fri" "Sat")) |
5bbfe8cb RB |
157 | |
158 | (define priv:locale-long-weekday-vector | |
159 | (vector | |
160 | "Sunday" "Monday" "Tuesday" "Wednesday" "Thursday" "Friday" "Saturday")) | |
161 | ||
afb47f6d | 162 | ;; note empty string in 0th place. |
5bbfe8cb RB |
163 | (define priv:locale-abbr-month-vector |
164 | (vector "" | |
165 | "Jan" | |
166 | "Feb" | |
167 | "Mar" | |
168 | "Apr" | |
169 | "May" | |
170 | "Jun" | |
171 | "Jul" | |
172 | "Aug" | |
173 | "Sep" | |
174 | "Oct" | |
175 | "Nov" | |
afb47f6d | 176 | "Dec")) |
5bbfe8cb RB |
177 | |
178 | (define priv:locale-long-month-vector | |
179 | (vector "" | |
180 | "January" | |
181 | "February" | |
182 | "March" | |
183 | "April" | |
184 | "May" | |
185 | "June" | |
186 | "July" | |
187 | "August" | |
188 | "September" | |
189 | "October" | |
190 | "November" | |
afb47f6d | 191 | "December")) |
5bbfe8cb RB |
192 | |
193 | (define priv:locale-pm "PM") | |
194 | (define priv:locale-am "AM") | |
195 | ||
196 | ;; See date->string | |
197 | (define priv:locale-date-time-format "~a ~b ~d ~H:~M:~S~z ~Y") | |
198 | (define priv:locale-short-date-format "~m/~d/~y") | |
199 | (define priv:locale-time-format "~H:~M:~S") | |
200 | (define priv:iso-8601-date-time-format "~Y-~m-~dT~H:~M:~S~z") | |
201 | ||
202 | ;;-- Miscellaneous Constants. | |
203 | ;;-- only the priv:tai-epoch-in-jd might need changing if | |
204 | ;; a different epoch is used. | |
205 | ||
206 | (define priv:nano 1000000000) ; nanoseconds in a second | |
207 | (define priv:sid 86400) ; seconds in a day | |
208 | (define priv:sihd 43200) ; seconds in a half day | |
209 | (define priv:tai-epoch-in-jd 4881175/2) ; julian day number for 'the epoch' | |
210 | ||
211 | ;; FIXME: should this be something other than misc-error? | |
212 | (define (priv:time-error caller type value) | |
213 | (if value | |
214 | (throw 'misc-error caller "TIME-ERROR type ~A: ~S" (list type value) #f) | |
215 | (throw 'misc-error caller "TIME-ERROR type ~A" (list type) #f))) | |
216 | ||
217 | ;; A table of leap seconds | |
218 | ;; See ftp://maia.usno.navy.mil/ser7/tai-utc.dat | |
219 | ;; and update as necessary. | |
220 | ;; this procedures reads the file in the abover | |
221 | ;; format and creates the leap second table | |
afb47f6d | 222 | ;; it also calls the almost standard, but not R5 procedures read-line |
5bbfe8cb RB |
223 | ;; & open-input-string |
224 | ;; ie (set! priv:leap-second-table (priv:read-tai-utc-date "tai-utc.dat")) | |
225 | ||
226 | (define (priv:read-tai-utc-data filename) | |
227 | (define (convert-jd jd) | |
228 | (* (- (inexact->exact jd) priv:tai-epoch-in-jd) priv:sid)) | |
229 | (define (convert-sec sec) | |
230 | (inexact->exact sec)) | |
231 | (let ((port (open-input-file filename)) | |
232 | (table '())) | |
233 | (let loop ((line (read-line port))) | |
234 | (if (not (eq? line eof)) | |
235 | (begin | |
236 | (let* ((data (read (open-input-string | |
afb47f6d | 237 | (string-append "(" line ")")))) |
5bbfe8cb RB |
238 | (year (car data)) |
239 | (jd (cadddr (cdr data))) | |
240 | (secs (cadddr (cdddr data)))) | |
241 | (if (>= year 1972) | |
242 | (set! table (cons | |
243 | (cons (convert-jd jd) (convert-sec secs)) | |
244 | table))) | |
245 | (loop (read-line port)))))) | |
246 | table)) | |
247 | ||
248 | ;; each entry is (tai seconds since epoch . # seconds to subtract for utc) | |
249 | ;; note they go higher to lower, and end in 1972. | |
250 | (define priv:leap-second-table | |
73e2a8d1 KR |
251 | '((1136073600 . 33) |
252 | (915148800 . 32) | |
5bbfe8cb RB |
253 | (867715200 . 31) |
254 | (820454400 . 30) | |
255 | (773020800 . 29) | |
256 | (741484800 . 28) | |
257 | (709948800 . 27) | |
258 | (662688000 . 26) | |
259 | (631152000 . 25) | |
260 | (567993600 . 24) | |
261 | (489024000 . 23) | |
262 | (425865600 . 22) | |
263 | (394329600 . 21) | |
264 | (362793600 . 20) | |
265 | (315532800 . 19) | |
266 | (283996800 . 18) | |
267 | (252460800 . 17) | |
268 | (220924800 . 16) | |
269 | (189302400 . 15) | |
270 | (157766400 . 14) | |
271 | (126230400 . 13) | |
272 | (94694400 . 12) | |
273 | (78796800 . 11) | |
274 | (63072000 . 10))) | |
275 | ||
276 | (define (read-leap-second-table filename) | |
277 | (set! priv:leap-second-table (priv:read-tai-utc-data filename)) | |
278 | (values)) | |
279 | ||
280 | ||
281 | (define (priv:leap-second-delta utc-seconds) | |
282 | (letrec ((lsd (lambda (table) | |
283 | (cond ((>= utc-seconds (caar table)) | |
284 | (cdar table)) | |
285 | (else (lsd (cdr table))))))) | |
286 | (if (< utc-seconds (* (- 1972 1970) 365 priv:sid)) 0 | |
287 | (lsd priv:leap-second-table)))) | |
288 | ||
289 | ||
290 | ;;; the TIME structure; creates the accessors, too. | |
291 | ||
292 | (define-record-type time | |
293 | (make-time-unnormalized type nanosecond second) | |
294 | time? | |
295 | (type time-type set-time-type!) | |
296 | (nanosecond time-nanosecond set-time-nanosecond!) | |
297 | (second time-second set-time-second!)) | |
298 | ||
299 | (define (copy-time time) | |
300 | (make-time (time-type time) (time-nanosecond time) (time-second time))) | |
301 | ||
4549ba4a | 302 | (define (priv:split-real r) |
b21cccf3 MD |
303 | (if (integer? r) |
304 | (values (inexact->exact r) 0) | |
4549ba4a MV |
305 | (let ((l (truncate r))) |
306 | (values (inexact->exact l) (- r l))))) | |
307 | ||
5bbfe8cb RB |
308 | (define (priv:time-normalize! t) |
309 | (if (>= (abs (time-nanosecond t)) 1000000000) | |
4549ba4a MV |
310 | (receive (int frac) |
311 | (priv:split-real (time-nanosecond t)) | |
312 | (set-time-second! t (+ (time-second t) | |
313 | (quotient int 1000000000))) | |
314 | (set-time-nanosecond! t (+ (remainder int 1000000000) | |
315 | frac)))) | |
5bbfe8cb RB |
316 | (if (and (positive? (time-second t)) |
317 | (negative? (time-nanosecond t))) | |
318 | (begin | |
319 | (set-time-second! t (- (time-second t) 1)) | |
320 | (set-time-nanosecond! t (+ 1000000000 (time-nanosecond t)))) | |
321 | (if (and (negative? (time-second t)) | |
322 | (positive? (time-nanosecond t))) | |
323 | (begin | |
324 | (set-time-second! t (+ (time-second t) 1)) | |
325 | (set-time-nanosecond! t (+ 1000000000 (time-nanosecond t)))))) | |
326 | t) | |
327 | ||
328 | (define (make-time type nanosecond second) | |
329 | (priv:time-normalize! (make-time-unnormalized type nanosecond second))) | |
330 | ||
331 | ;; Helpers | |
332 | ;; FIXME: finish this and publish it? | |
333 | (define (date->broken-down-time date) | |
334 | (let ((result (mktime 0))) | |
335 | ;; FIXME: What should we do about leap-seconds which may overflow | |
336 | ;; set-tm:sec? | |
337 | (set-tm:sec result (date-second date)) | |
338 | (set-tm:min result (date-minute date)) | |
339 | (set-tm:hour result (date-hour date)) | |
340 | ;; FIXME: SRFI day ranges from 0-31. (not compatible with set-tm:mday). | |
341 | (set-tm:mday result (date-day date)) | |
342 | (set-tm:month result (- (date-month date) 1)) | |
343 | ;; FIXME: need to signal error on range violation. | |
344 | (set-tm:year result (+ 1900 (date-year date))) | |
345 | (set-tm:isdst result -1) | |
346 | (set-tm:gmtoff result (- (date-zone-offset date))) | |
347 | result)) | |
348 | ||
349 | ;;; current-time | |
350 | ||
351 | ;;; specific time getters. | |
352 | ||
353 | (define (priv:current-time-utc) | |
354 | ;; Resolution is microseconds. | |
355 | (let ((tod (gettimeofday))) | |
356 | (make-time time-utc (* (cdr tod) 1000) (car tod)))) | |
357 | ||
358 | (define (priv:current-time-tai) | |
359 | ;; Resolution is microseconds. | |
360 | (let* ((tod (gettimeofday)) | |
361 | (sec (car tod)) | |
362 | (usec (cdr tod))) | |
363 | (make-time time-tai | |
364 | (* usec 1000) | |
4549ba4a | 365 | (+ (car tod) (priv:leap-second-delta sec))))) |
5bbfe8cb RB |
366 | |
367 | ;;(define (priv:current-time-ms-time time-type proc) | |
368 | ;; (let ((current-ms (proc))) | |
369 | ;; (make-time time-type | |
370 | ;; (quotient current-ms 10000) | |
371 | ;; (* (remainder current-ms 1000) 10000)))) | |
372 | ||
373 | ;; -- we define it to be the same as TAI. | |
374 | ;; A different implemation of current-time-montonic | |
375 | ;; will require rewriting all of the time-monotonic converters, | |
376 | ;; of course. | |
377 | ||
378 | (define (priv:current-time-monotonic) | |
379 | ;; Resolution is microseconds. | |
380 | (priv:current-time-tai)) | |
381 | ||
382 | (define (priv:current-time-thread) | |
383 | (priv:time-error 'current-time 'unsupported-clock-type 'time-thread)) | |
384 | ||
385 | (define priv:ns-per-guile-tick (/ 1000000000 internal-time-units-per-second)) | |
386 | ||
387 | (define (priv:current-time-process) | |
388 | (let ((run-time (get-internal-run-time))) | |
389 | (make-time | |
390 | time-process | |
391 | (quotient run-time internal-time-units-per-second) | |
392 | (* (remainder run-time internal-time-units-per-second) | |
393 | priv:ns-per-guile-tick)))) | |
394 | ||
395 | (define (priv:current-time-process) | |
396 | (let ((run-time (get-internal-run-time))) | |
397 | (list | |
398 | 'time-process | |
399 | (* (remainder run-time internal-time-units-per-second) | |
400 | priv:ns-per-guile-tick) | |
401 | (quotient run-time internal-time-units-per-second)))) | |
402 | ||
403 | ;;(define (priv:current-time-gc) | |
404 | ;; (priv:current-time-ms-time time-gc current-gc-milliseconds)) | |
405 | ||
406 | (define (current-time . clock-type) | |
5e1fb41f | 407 | (let ((clock-type (if (null? clock-type) time-utc (car clock-type)))) |
5bbfe8cb RB |
408 | (cond |
409 | ((eq? clock-type time-tai) (priv:current-time-tai)) | |
410 | ((eq? clock-type time-utc) (priv:current-time-utc)) | |
411 | ((eq? clock-type time-monotonic) (priv:current-time-monotonic)) | |
412 | ((eq? clock-type time-thread) (priv:current-time-thread)) | |
413 | ((eq? clock-type time-process) (priv:current-time-process)) | |
414 | ;; ((eq? clock-type time-gc) (priv:current-time-gc)) | |
415 | (else (priv:time-error 'current-time 'invalid-clock-type clock-type))))) | |
416 | ||
417 | ;; -- Time Resolution | |
418 | ;; This is the resolution of the clock in nanoseconds. | |
419 | ;; This will be implementation specific. | |
420 | ||
421 | (define (time-resolution . clock-type) | |
5e1fb41f | 422 | (let ((clock-type (if (null? clock-type) time-utc (car clock-type)))) |
5bbfe8cb RB |
423 | (case clock-type |
424 | ((time-tai) 1000) | |
425 | ((time-utc) 1000) | |
426 | ((time-monotonic) 1000) | |
427 | ((time-process) priv:ns-per-guile-tick) | |
428 | ;; ((eq? clock-type time-thread) 1000) | |
429 | ;; ((eq? clock-type time-gc) 10000) | |
430 | (else (priv:time-error 'time-resolution 'invalid-clock-type clock-type))))) | |
431 | ||
432 | ;; -- Time comparisons | |
433 | ||
434 | (define (time=? t1 t2) | |
435 | ;; Arrange tests for speed and presume that t1 and t2 are actually times. | |
436 | ;; also presume it will be rare to check two times of different types. | |
437 | (and (= (time-second t1) (time-second t2)) | |
4549ba4a | 438 | (= (time-nanosecond t1) (time-nanosecond t2)) |
5bbfe8cb RB |
439 | (eq? (time-type t1) (time-type t2)))) |
440 | ||
441 | (define (time>? t1 t2) | |
442 | (or (> (time-second t1) (time-second t2)) | |
443 | (and (= (time-second t1) (time-second t2)) | |
444 | (> (time-nanosecond t1) (time-nanosecond t2))))) | |
445 | ||
446 | (define (time<? t1 t2) | |
447 | (or (< (time-second t1) (time-second t2)) | |
448 | (and (= (time-second t1) (time-second t2)) | |
449 | (< (time-nanosecond t1) (time-nanosecond t2))))) | |
450 | ||
451 | (define (time>=? t1 t2) | |
452 | (or (> (time-second t1) (time-second t2)) | |
453 | (and (= (time-second t1) (time-second t2)) | |
454 | (>= (time-nanosecond t1) (time-nanosecond t2))))) | |
455 | ||
456 | (define (time<=? t1 t2) | |
4549ba4a MV |
457 | (or (< (time-second t1) (time-second t2)) |
458 | (and (= (time-second t1) (time-second t2)) | |
459 | (<= (time-nanosecond t1) (time-nanosecond t2))))) | |
5bbfe8cb RB |
460 | |
461 | ;; -- Time arithmetic | |
462 | ||
463 | (define (time-difference! time1 time2) | |
464 | (let ((sec-diff (- (time-second time1) (time-second time2))) | |
465 | (nsec-diff (- (time-nanosecond time1) (time-nanosecond time2)))) | |
466 | (set-time-type! time1 time-duration) | |
467 | (set-time-second! time1 sec-diff) | |
468 | (set-time-nanosecond! time1 nsec-diff) | |
469 | (priv:time-normalize! time1))) | |
470 | ||
471 | (define (time-difference time1 time2) | |
472 | (let ((result (copy-time time1))) | |
473 | (time-difference! result time2))) | |
474 | ||
475 | (define (add-duration! t duration) | |
476 | (if (not (eq? (time-type duration) time-duration)) | |
477 | (priv:time-error 'add-duration 'not-duration duration) | |
478 | (let ((sec-plus (+ (time-second t) (time-second duration))) | |
479 | (nsec-plus (+ (time-nanosecond t) (time-nanosecond duration)))) | |
480 | (set-time-second! t sec-plus) | |
481 | (set-time-nanosecond! t nsec-plus) | |
482 | (priv:time-normalize! t)))) | |
483 | ||
4549ba4a | 484 | (define (add-duration t duration) |
5bbfe8cb | 485 | (let ((result (copy-time t))) |
afb47f6d | 486 | (add-duration! result duration))) |
5bbfe8cb RB |
487 | |
488 | (define (subtract-duration! t duration) | |
489 | (if (not (eq? (time-type duration) time-duration)) | |
490 | (priv:time-error 'add-duration 'not-duration duration) | |
491 | (let ((sec-minus (- (time-second t) (time-second duration))) | |
492 | (nsec-minus (- (time-nanosecond t) (time-nanosecond duration)))) | |
493 | (set-time-second! t sec-minus) | |
494 | (set-time-nanosecond! t nsec-minus) | |
495 | (priv:time-normalize! t)))) | |
496 | ||
497 | (define (subtract-duration time1 duration) | |
498 | (let ((result (copy-time time1))) | |
499 | (subtract-duration! result duration))) | |
500 | ||
501 | ;; -- Converters between types. | |
502 | ||
503 | (define (priv:time-tai->time-utc! time-in time-out caller) | |
504 | (if (not (eq? (time-type time-in) time-tai)) | |
505 | (priv:time-error caller 'incompatible-time-types time-in)) | |
506 | (set-time-type! time-out time-utc) | |
507 | (set-time-nanosecond! time-out (time-nanosecond time-in)) | |
508 | (set-time-second! time-out (- (time-second time-in) | |
afb47f6d | 509 | (priv:leap-second-delta |
5bbfe8cb RB |
510 | (time-second time-in)))) |
511 | time-out) | |
512 | ||
513 | (define (time-tai->time-utc time-in) | |
4549ba4a | 514 | (priv:time-tai->time-utc! time-in (make-time-unnormalized #f #f #f) 'time-tai->time-utc)) |
5bbfe8cb RB |
515 | |
516 | ||
517 | (define (time-tai->time-utc! time-in) | |
518 | (priv:time-tai->time-utc! time-in time-in 'time-tai->time-utc!)) | |
519 | ||
520 | (define (priv:time-utc->time-tai! time-in time-out caller) | |
521 | (if (not (eq? (time-type time-in) time-utc)) | |
522 | (priv:time-error caller 'incompatible-time-types time-in)) | |
523 | (set-time-type! time-out time-tai) | |
524 | (set-time-nanosecond! time-out (time-nanosecond time-in)) | |
525 | (set-time-second! time-out (+ (time-second time-in) | |
afb47f6d | 526 | (priv:leap-second-delta |
5bbfe8cb RB |
527 | (time-second time-in)))) |
528 | time-out) | |
529 | ||
530 | (define (time-utc->time-tai time-in) | |
4549ba4a | 531 | (priv:time-utc->time-tai! time-in (make-time-unnormalized #f #f #f) 'time-utc->time-tai)) |
5bbfe8cb RB |
532 | |
533 | (define (time-utc->time-tai! time-in) | |
534 | (priv:time-utc->time-tai! time-in time-in 'time-utc->time-tai!)) | |
535 | ||
536 | ;; -- these depend on time-monotonic having the same definition as time-tai! | |
537 | (define (time-monotonic->time-utc time-in) | |
538 | (if (not (eq? (time-type time-in) time-monotonic)) | |
539 | (priv:time-error caller 'incompatible-time-types time-in)) | |
540 | (let ((ntime (copy-time time-in))) | |
541 | (set-time-type! ntime time-tai) | |
542 | (priv:time-tai->time-utc! ntime ntime 'time-monotonic->time-utc))) | |
543 | ||
544 | (define (time-monotonic->time-utc! time-in) | |
545 | (if (not (eq? (time-type time-in) time-monotonic)) | |
546 | (priv:time-error caller 'incompatible-time-types time-in)) | |
547 | (set-time-type! time-in time-tai) | |
548 | (priv:time-tai->time-utc! ntime ntime 'time-monotonic->time-utc)) | |
549 | ||
550 | (define (time-monotonic->time-tai time-in) | |
551 | (if (not (eq? (time-type time-in) time-monotonic)) | |
552 | (priv:time-error caller 'incompatible-time-types time-in)) | |
553 | (let ((ntime (copy-time time-in))) | |
554 | (set-time-type! ntime time-tai) | |
555 | ntime)) | |
556 | ||
557 | (define (time-monotonic->time-tai! time-in) | |
558 | (if (not (eq? (time-type time-in) time-monotonic)) | |
559 | (priv:time-error caller 'incompatible-time-types time-in)) | |
560 | (set-time-type! time-in time-tai) | |
561 | time-in) | |
562 | ||
563 | (define (time-utc->time-monotonic time-in) | |
564 | (if (not (eq? (time-type time-in) time-utc)) | |
565 | (priv:time-error caller 'incompatible-time-types time-in)) | |
4549ba4a | 566 | (let ((ntime (priv:time-utc->time-tai! time-in (make-time-unnormalized #f #f #f) |
5bbfe8cb RB |
567 | 'time-utc->time-monotonic))) |
568 | (set-time-type! ntime time-monotonic) | |
569 | ntime)) | |
570 | ||
571 | (define (time-utc->time-monotonic! time-in) | |
572 | (if (not (eq? (time-type time-in) time-utc)) | |
573 | (priv:time-error caller 'incompatible-time-types time-in)) | |
574 | (let ((ntime (priv:time-utc->time-tai! time-in time-in | |
575 | 'time-utc->time-monotonic!))) | |
576 | (set-time-type! ntime time-monotonic) | |
577 | ntime)) | |
578 | ||
579 | (define (time-tai->time-monotonic time-in) | |
580 | (if (not (eq? (time-type time-in) time-tai)) | |
581 | (priv:time-error caller 'incompatible-time-types time-in)) | |
582 | (let ((ntime (copy-time time-in))) | |
583 | (set-time-type! ntime time-monotonic) | |
584 | ntime)) | |
585 | ||
586 | (define (time-tai->time-monotonic! time-in) | |
587 | (if (not (eq? (time-type time-in) time-tai)) | |
588 | (priv:time-error caller 'incompatible-time-types time-in)) | |
589 | (set-time-type! time-in time-monotonic) | |
590 | time-in) | |
591 | ||
592 | ;; -- Date Structures | |
593 | ||
5e1fb41f RB |
594 | ;; FIXME: to be really safe, perhaps we should normalize the |
595 | ;; seconds/nanoseconds/minutes coming in to make-date... | |
596 | ||
5bbfe8cb | 597 | (define-record-type date |
5e1fb41f RB |
598 | (make-date nanosecond second minute |
599 | hour day month | |
600 | year | |
601 | zone-offset) | |
5bbfe8cb | 602 | date? |
4549ba4a MV |
603 | (nanosecond date-nanosecond set-date-nanosecond!) |
604 | (second date-second set-date-second!) | |
605 | (minute date-minute set-date-minute!) | |
606 | (hour date-hour set-date-hour!) | |
607 | (day date-day set-date-day!) | |
608 | (month date-month set-date-month!) | |
609 | (year date-year set-date-year!) | |
610 | (zone-offset date-zone-offset set-date-zone-offset!)) | |
5e1fb41f | 611 | |
5bbfe8cb RB |
612 | ;; gives the julian day which starts at noon. |
613 | (define (priv:encode-julian-day-number day month year) | |
614 | (let* ((a (quotient (- 14 month) 12)) | |
615 | (y (- (+ year 4800) a (if (negative? year) -1 0))) | |
616 | (m (- (+ month (* 12 a)) 3))) | |
617 | (+ day | |
618 | (quotient (+ (* 153 m) 2) 5) | |
619 | (* 365 y) | |
620 | (quotient y 4) | |
621 | (- (quotient y 100)) | |
622 | (quotient y 400) | |
623 | -32045))) | |
624 | ||
afb47f6d | 625 | ;; gives the seconds/date/month/year |
5bbfe8cb | 626 | (define (priv:decode-julian-day-number jdn) |
5e1fb41f | 627 | (let* ((days (inexact->exact (truncate jdn))) |
5bbfe8cb RB |
628 | (a (+ days 32044)) |
629 | (b (quotient (+ (* 4 a) 3) 146097)) | |
630 | (c (- a (quotient (* 146097 b) 4))) | |
631 | (d (quotient (+ (* 4 c) 3) 1461)) | |
632 | (e (- c (quotient (* 1461 d) 4))) | |
633 | (m (quotient (+ (* 5 e) 2) 153)) | |
634 | (y (+ (* 100 b) d -4800 (quotient m 10)))) | |
635 | (values ; seconds date month year | |
636 | (* (- jdn days) priv:sid) | |
637 | (+ e (- (quotient (+ (* 153 m) 2) 5)) 1) | |
638 | (+ m 3 (* -12 (quotient m 10))) | |
639 | (if (>= 0 y) (- y 1) y)))) | |
640 | ||
641 | ;; relies on the fact that we named our time zone accessor | |
642 | ;; differently from MzScheme's.... | |
643 | ;; This should be written to be OS specific. | |
644 | ||
4549ba4a | 645 | (define (priv:local-tz-offset utc-time) |
5bbfe8cb | 646 | ;; SRFI uses seconds West, but guile (and libc) use seconds East. |
4549ba4a | 647 | (- (tm:gmtoff (localtime (time-second utc-time))))) |
5bbfe8cb RB |
648 | |
649 | ;; special thing -- ignores nanos | |
650 | (define (priv:time->julian-day-number seconds tz-offset) | |
651 | (+ (/ (+ seconds tz-offset priv:sihd) | |
652 | priv:sid) | |
653 | priv:tai-epoch-in-jd)) | |
654 | ||
655 | (define (priv:leap-second? second) | |
656 | (and (assoc second priv:leap-second-table) #t)) | |
657 | ||
658 | (define (time-utc->date time . tz-offset) | |
659 | (if (not (eq? (time-type time) time-utc)) | |
660 | (priv:time-error 'time->date 'incompatible-time-types time)) | |
4549ba4a | 661 | (let* ((offset (if (null? tz-offset) |
afb47f6d | 662 | (priv:local-tz-offset time) |
4549ba4a | 663 | (car tz-offset))) |
5bbfe8cb RB |
664 | (leap-second? (priv:leap-second? (+ offset (time-second time)))) |
665 | (jdn (priv:time->julian-day-number (if leap-second? | |
666 | (- (time-second time) 1) | |
667 | (time-second time)) | |
668 | offset))) | |
669 | ||
670 | (call-with-values (lambda () (priv:decode-julian-day-number jdn)) | |
671 | (lambda (secs date month year) | |
4549ba4a MV |
672 | ;; secs is a real because jdn is a real in Guile; |
673 | ;; but it is conceptionally an integer. | |
674 | (let* ((int-secs (inexact->exact (round secs))) | |
5e1fb41f RB |
675 | (hours (quotient int-secs (* 60 60))) |
676 | (rem (remainder int-secs (* 60 60))) | |
5bbfe8cb RB |
677 | (minutes (quotient rem 60)) |
678 | (seconds (remainder rem 60))) | |
679 | (make-date (time-nanosecond time) | |
680 | (if leap-second? (+ seconds 1) seconds) | |
681 | minutes | |
682 | hours | |
683 | date | |
684 | month | |
685 | year | |
686 | offset)))))) | |
687 | ||
688 | (define (time-tai->date time . tz-offset) | |
689 | (if (not (eq? (time-type time) time-tai)) | |
690 | (priv:time-error 'time->date 'incompatible-time-types time)) | |
4549ba4a MV |
691 | (let* ((offset (if (null? tz-offset) |
692 | (priv:local-tz-offset (time-tai->time-utc time)) | |
693 | (car tz-offset))) | |
5bbfe8cb RB |
694 | (seconds (- (time-second time) |
695 | (priv:leap-second-delta (time-second time)))) | |
696 | (leap-second? (priv:leap-second? (+ offset seconds))) | |
697 | (jdn (priv:time->julian-day-number (if leap-second? | |
698 | (- seconds 1) | |
699 | seconds) | |
700 | offset))) | |
701 | (call-with-values (lambda () (priv:decode-julian-day-number jdn)) | |
702 | (lambda (secs date month year) | |
4549ba4a MV |
703 | ;; secs is a real because jdn is a real in Guile; |
704 | ;; but it is conceptionally an integer. | |
5bbfe8cb | 705 | ;; adjust for leap seconds if necessary ... |
4549ba4a MV |
706 | (let* ((int-secs (inexact->exact (round secs))) |
707 | (hours (quotient int-secs (* 60 60))) | |
708 | (rem (remainder int-secs (* 60 60))) | |
5bbfe8cb RB |
709 | (minutes (quotient rem 60)) |
710 | (seconds (remainder rem 60))) | |
711 | (make-date (time-nanosecond time) | |
712 | (if leap-second? (+ seconds 1) seconds) | |
713 | minutes | |
714 | hours | |
715 | date | |
716 | month | |
717 | year | |
718 | offset)))))) | |
719 | ||
720 | ;; this is the same as time-tai->date. | |
721 | (define (time-monotonic->date time . tz-offset) | |
722 | (if (not (eq? (time-type time) time-monotonic)) | |
723 | (priv:time-error 'time->date 'incompatible-time-types time)) | |
4549ba4a MV |
724 | (let* ((offset (if (null? tz-offset) |
725 | (priv:local-tz-offset (time-monotonic->time-utc time)) | |
726 | (car tz-offset))) | |
5bbfe8cb RB |
727 | (seconds (- (time-second time) |
728 | (priv:leap-second-delta (time-second time)))) | |
729 | (leap-second? (priv:leap-second? (+ offset seconds))) | |
730 | (jdn (priv:time->julian-day-number (if leap-second? | |
731 | (- seconds 1) | |
732 | seconds) | |
733 | offset))) | |
734 | (call-with-values (lambda () (priv:decode-julian-day-number jdn)) | |
735 | (lambda (secs date month year) | |
4549ba4a MV |
736 | ;; secs is a real because jdn is a real in Guile; |
737 | ;; but it is conceptionally an integer. | |
5bbfe8cb | 738 | ;; adjust for leap seconds if necessary ... |
4549ba4a MV |
739 | (let* ((int-secs (inexact->exact (round secs))) |
740 | (hours (quotient int-secs (* 60 60))) | |
741 | (rem (remainder int-secs (* 60 60))) | |
5bbfe8cb RB |
742 | (minutes (quotient rem 60)) |
743 | (seconds (remainder rem 60))) | |
744 | (make-date (time-nanosecond time) | |
745 | (if leap-second? (+ seconds 1) seconds) | |
746 | minutes | |
747 | hours | |
748 | date | |
749 | month | |
750 | year | |
751 | offset)))))) | |
752 | ||
753 | (define (date->time-utc date) | |
4549ba4a | 754 | (let* ((jdays (- (priv:encode-julian-day-number (date-day date) |
5bbfe8cb RB |
755 | (date-month date) |
756 | (date-year date)) | |
4549ba4a MV |
757 | priv:tai-epoch-in-jd)) |
758 | ;; jdays is an integer plus 1/2, | |
759 | (jdays-1/2 (inexact->exact (- jdays 1/2)))) | |
afb47f6d | 760 | (make-time |
5bbfe8cb RB |
761 | time-utc |
762 | (date-nanosecond date) | |
4549ba4a | 763 | (+ (* jdays-1/2 24 60 60) |
5bbfe8cb RB |
764 | (* (date-hour date) 60 60) |
765 | (* (date-minute date) 60) | |
4549ba4a MV |
766 | (date-second date) |
767 | (- (date-zone-offset date)))))) | |
5bbfe8cb RB |
768 | |
769 | (define (date->time-tai date) | |
770 | (time-utc->time-tai! (date->time-utc date))) | |
771 | ||
772 | (define (date->time-monotonic date) | |
773 | (time-utc->time-monotonic! (date->time-utc date))) | |
774 | ||
775 | (define (priv:leap-year? year) | |
776 | (or (= (modulo year 400) 0) | |
777 | (and (= (modulo year 4) 0) (not (= (modulo year 100) 0))))) | |
778 | ||
779 | (define (leap-year? date) | |
780 | (priv:leap-year? (date-year date))) | |
781 | ||
359b471e NJ |
782 | ;; Map 1-based month number M to number of days in the year before the |
783 | ;; start of month M (in a non-leap year). | |
784 | (define priv:month-assoc '((1 . 0) (2 . 31) (3 . 59) (4 . 90) | |
785 | (5 . 120) (6 . 151) (7 . 181) (8 . 212) | |
786 | (9 . 243) (10 . 273) (11 . 304) (12 . 334))) | |
5bbfe8cb RB |
787 | |
788 | (define (priv:year-day day month year) | |
cd328b4f | 789 | (let ((days-pr (assoc month priv:month-assoc))) |
5bbfe8cb RB |
790 | (if (not days-pr) |
791 | (priv:error 'date-year-day 'invalid-month-specification month)) | |
792 | (if (and (priv:leap-year? year) (> month 2)) | |
793 | (+ day (cdr days-pr) 1) | |
794 | (+ day (cdr days-pr))))) | |
795 | ||
796 | (define (date-year-day date) | |
797 | (priv:year-day (date-day date) (date-month date) (date-year date))) | |
798 | ||
afb47f6d | 799 | ;; from calendar faq |
5bbfe8cb RB |
800 | (define (priv:week-day day month year) |
801 | (let* ((a (quotient (- 14 month) 12)) | |
802 | (y (- year a)) | |
803 | (m (+ month (* 12 a) -2))) | |
804 | (modulo (+ day | |
805 | y | |
806 | (quotient y 4) | |
807 | (- (quotient y 100)) | |
808 | (quotient y 400) | |
809 | (quotient (* 31 m) 12)) | |
810 | 7))) | |
811 | ||
812 | (define (date-week-day date) | |
813 | (priv:week-day (date-day date) (date-month date) (date-year date))) | |
814 | ||
815 | (define (priv:days-before-first-week date day-of-week-starting-week) | |
816 | (let* ((first-day (make-date 0 0 0 0 | |
817 | 1 | |
818 | 1 | |
819 | (date-year date) | |
820 | #f)) | |
821 | (fdweek-day (date-week-day first-day))) | |
822 | (modulo (- day-of-week-starting-week fdweek-day) | |
823 | 7))) | |
824 | ||
f3cc3dab KR |
825 | ;; The "-1" here is a fix for the reference implementation, to make a new |
826 | ;; week start on the given day-of-week-starting-week. date-year-day returns | |
827 | ;; a day starting from 1 for 1st Jan. | |
828 | ;; | |
5bbfe8cb RB |
829 | (define (date-week-number date day-of-week-starting-week) |
830 | (quotient (- (date-year-day date) | |
f3cc3dab | 831 | 1 |
5bbfe8cb RB |
832 | (priv:days-before-first-week date day-of-week-starting-week)) |
833 | 7)) | |
834 | ||
afb47f6d | 835 | (define (current-date . tz-offset) |
4549ba4a MV |
836 | (let ((time (current-time time-utc))) |
837 | (time-utc->date | |
838 | time | |
839 | (if (null? tz-offset) | |
840 | (priv:local-tz-offset time) | |
841 | (car tz-offset))))) | |
5bbfe8cb RB |
842 | |
843 | ;; given a 'two digit' number, find the year within 50 years +/- | |
844 | (define (priv:natural-year n) | |
845 | (let* ((current-year (date-year (current-date))) | |
846 | (current-century (* (quotient current-year 100) 100))) | |
847 | (cond | |
848 | ((>= n 100) n) | |
849 | ((< n 0) n) | |
850 | ((<= (- (+ current-century n) current-year) 50) (+ current-century n)) | |
851 | (else (+ (- current-century 100) n))))) | |
852 | ||
853 | (define (date->julian-day date) | |
854 | (let ((nanosecond (date-nanosecond date)) | |
855 | (second (date-second date)) | |
856 | (minute (date-minute date)) | |
857 | (hour (date-hour date)) | |
858 | (day (date-day date)) | |
859 | (month (date-month date)) | |
860 | (year (date-year date))) | |
861 | (+ (priv:encode-julian-day-number day month year) | |
862 | (- 1/2) | |
863 | (+ (/ (+ (* hour 60 60) | |
864 | (* minute 60) | |
865 | second | |
866 | (/ nanosecond priv:nano)) | |
867 | priv:sid))))) | |
868 | ||
869 | (define (date->modified-julian-day date) | |
870 | (- (date->julian-day date) | |
871 | 4800001/2)) | |
872 | ||
873 | (define (time-utc->julian-day time) | |
874 | (if (not (eq? (time-type time) time-utc)) | |
875 | (priv:time-error 'time->date 'incompatible-time-types time)) | |
876 | (+ (/ (+ (time-second time) (/ (time-nanosecond time) priv:nano)) | |
877 | priv:sid) | |
878 | priv:tai-epoch-in-jd)) | |
879 | ||
880 | (define (time-utc->modified-julian-day time) | |
881 | (- (time-utc->julian-day time) | |
882 | 4800001/2)) | |
883 | ||
884 | (define (time-tai->julian-day time) | |
885 | (if (not (eq? (time-type time) time-tai)) | |
886 | (priv:time-error 'time->date 'incompatible-time-types time)) | |
afb47f6d | 887 | (+ (/ (+ (- (time-second time) |
5bbfe8cb RB |
888 | (priv:leap-second-delta (time-second time))) |
889 | (/ (time-nanosecond time) priv:nano)) | |
890 | priv:sid) | |
891 | priv:tai-epoch-in-jd)) | |
892 | ||
893 | (define (time-tai->modified-julian-day time) | |
894 | (- (time-tai->julian-day time) | |
895 | 4800001/2)) | |
896 | ||
897 | ;; this is the same as time-tai->julian-day | |
898 | (define (time-monotonic->julian-day time) | |
899 | (if (not (eq? (time-type time) time-monotonic)) | |
900 | (priv:time-error 'time->date 'incompatible-time-types time)) | |
afb47f6d | 901 | (+ (/ (+ (- (time-second time) |
5bbfe8cb RB |
902 | (priv:leap-second-delta (time-second time))) |
903 | (/ (time-nanosecond time) priv:nano)) | |
904 | priv:sid) | |
905 | priv:tai-epoch-in-jd)) | |
906 | ||
907 | (define (time-monotonic->modified-julian-day time) | |
908 | (- (time-monotonic->julian-day time) | |
909 | 4800001/2)) | |
910 | ||
911 | (define (julian-day->time-utc jdn) | |
912 | (let ((secs (* priv:sid (- jdn priv:tai-epoch-in-jd)))) | |
913 | (receive (seconds parts) | |
4549ba4a | 914 | (priv:split-real secs) |
afb47f6d | 915 | (make-time time-utc |
4549ba4a MV |
916 | (* parts priv:nano) |
917 | seconds)))) | |
5bbfe8cb RB |
918 | |
919 | (define (julian-day->time-tai jdn) | |
920 | (time-utc->time-tai! (julian-day->time-utc jdn))) | |
921 | ||
922 | (define (julian-day->time-monotonic jdn) | |
923 | (time-utc->time-monotonic! (julian-day->time-utc jdn))) | |
924 | ||
925 | (define (julian-day->date jdn . tz-offset) | |
4549ba4a MV |
926 | (let* ((time (julian-day->time-utc jdn)) |
927 | (offset (if (null? tz-offset) | |
928 | (priv:local-tz-offset time) | |
929 | (car tz-offset)))) | |
930 | (time-utc->date time offset))) | |
5bbfe8cb RB |
931 | |
932 | (define (modified-julian-day->date jdn . tz-offset) | |
4549ba4a MV |
933 | (apply julian-day->date (+ jdn 4800001/2) |
934 | tz-offset)) | |
5bbfe8cb RB |
935 | |
936 | (define (modified-julian-day->time-utc jdn) | |
937 | (julian-day->time-utc (+ jdn 4800001/2))) | |
938 | ||
939 | (define (modified-julian-day->time-tai jdn) | |
940 | (julian-day->time-tai (+ jdn 4800001/2))) | |
941 | ||
942 | (define (modified-julian-day->time-monotonic jdn) | |
943 | (julian-day->time-monotonic (+ jdn 4800001/2))) | |
944 | ||
945 | (define (current-julian-day) | |
946 | (time-utc->julian-day (current-time time-utc))) | |
947 | ||
948 | (define (current-modified-julian-day) | |
949 | (time-utc->modified-julian-day (current-time time-utc))) | |
950 | ||
951 | ;; returns a string rep. of number N, of minimum LENGTH, padded with | |
952 | ;; character PAD-WITH. If PAD-WITH is #f, no padding is done, and it's | |
953 | ;; as if number->string was used. if string is longer than or equal | |
954 | ;; in length to LENGTH, it's as if number->string was used. | |
955 | ||
956 | (define (priv:padding n pad-with length) | |
957 | (let* ((str (number->string n)) | |
958 | (str-len (string-length str))) | |
959 | (if (or (>= str-len length) | |
960 | (not pad-with)) | |
961 | str | |
962 | (string-append (make-string (- length str-len) pad-with) str)))) | |
963 | ||
964 | (define (priv:last-n-digits i n) | |
965 | (abs (remainder i (expt 10 n)))) | |
966 | ||
afb47f6d | 967 | (define (priv:locale-abbr-weekday n) |
5bbfe8cb RB |
968 | (vector-ref priv:locale-abbr-weekday-vector n)) |
969 | ||
970 | (define (priv:locale-long-weekday n) | |
971 | (vector-ref priv:locale-long-weekday-vector n)) | |
972 | ||
973 | (define (priv:locale-abbr-month n) | |
974 | (vector-ref priv:locale-abbr-month-vector n)) | |
975 | ||
976 | (define (priv:locale-long-month n) | |
977 | (vector-ref priv:locale-long-month-vector n)) | |
978 | ||
979 | (define (priv:vector-find needle haystack comparator) | |
980 | (let ((len (vector-length haystack))) | |
981 | (define (priv:vector-find-int index) | |
982 | (cond | |
983 | ((>= index len) #f) | |
984 | ((comparator needle (vector-ref haystack index)) index) | |
985 | (else (priv:vector-find-int (+ index 1))))) | |
986 | (priv:vector-find-int 0))) | |
987 | ||
988 | (define (priv:locale-abbr-weekday->index string) | |
989 | (priv:vector-find string priv:locale-abbr-weekday-vector string=?)) | |
990 | ||
991 | (define (priv:locale-long-weekday->index string) | |
992 | (priv:vector-find string priv:locale-long-weekday-vector string=?)) | |
993 | ||
994 | (define (priv:locale-abbr-month->index string) | |
995 | (priv:vector-find string priv:locale-abbr-month-vector string=?)) | |
996 | ||
997 | (define (priv:locale-long-month->index string) | |
998 | (priv:vector-find string priv:locale-long-month-vector string=?)) | |
999 | ||
1000 | ||
4549ba4a MV |
1001 | ;; FIXME: mkoeppe: Put a symbolic time zone in the date structs. |
1002 | ;; Print it here instead of the numerical offset if available. | |
5bbfe8cb | 1003 | (define (priv:locale-print-time-zone date port) |
4549ba4a | 1004 | (priv:tz-printer (date-zone-offset date) port)) |
5bbfe8cb RB |
1005 | |
1006 | ;; FIXME: we should use strftime to determine this dynamically if possible. | |
1007 | ;; Again, locale specific. | |
1008 | (define (priv:locale-am/pm hr) | |
1009 | (if (> hr 11) priv:locale-pm priv:locale-am)) | |
1010 | ||
1011 | (define (priv:tz-printer offset port) | |
1012 | (cond | |
1013 | ((= offset 0) (display "Z" port)) | |
1014 | ((negative? offset) (display "-" port)) | |
1015 | (else (display "+" port))) | |
1016 | (if (not (= offset 0)) | |
1017 | (let ((hours (abs (quotient offset (* 60 60)))) | |
1018 | (minutes (abs (quotient (remainder offset (* 60 60)) 60)))) | |
1019 | (display (priv:padding hours #\0 2) port) | |
1020 | (display (priv:padding minutes #\0 2) port)))) | |
1021 | ||
5bbfe8cb RB |
1022 | ;; A table of output formatting directives. |
1023 | ;; the first time is the format char. | |
1024 | ;; the second is a procedure that takes the date, a padding character | |
1025 | ;; (which might be #f), and the output port. | |
1026 | ;; | |
afb47f6d | 1027 | (define priv:directives |
5bbfe8cb RB |
1028 | (list |
1029 | (cons #\~ (lambda (date pad-with port) | |
1030 | (display #\~ port))) | |
1031 | (cons #\a (lambda (date pad-with port) | |
1032 | (display (priv:locale-abbr-weekday (date-week-day date)) | |
1033 | port))) | |
1034 | (cons #\A (lambda (date pad-with port) | |
1035 | (display (priv:locale-long-weekday (date-week-day date)) | |
1036 | port))) | |
1037 | (cons #\b (lambda (date pad-with port) | |
1038 | (display (priv:locale-abbr-month (date-month date)) | |
1039 | port))) | |
1040 | (cons #\B (lambda (date pad-with port) | |
1041 | (display (priv:locale-long-month (date-month date)) | |
1042 | port))) | |
1043 | (cons #\c (lambda (date pad-with port) | |
1044 | (display (date->string date priv:locale-date-time-format) port))) | |
1045 | (cons #\d (lambda (date pad-with port) | |
1046 | (display (priv:padding (date-day date) | |
1047 | #\0 2) | |
1048 | port))) | |
1049 | (cons #\D (lambda (date pad-with port) | |
1050 | (display (date->string date "~m/~d/~y") port))) | |
1051 | (cons #\e (lambda (date pad-with port) | |
1052 | (display (priv:padding (date-day date) | |
1053 | #\Space 2) | |
1054 | port))) | |
1055 | (cons #\f (lambda (date pad-with port) | |
1056 | (if (> (date-nanosecond date) | |
1057 | priv:nano) | |
1058 | (display (priv:padding (+ (date-second date) 1) | |
1059 | pad-with 2) | |
1060 | port) | |
1061 | (display (priv:padding (date-second date) | |
1062 | pad-with 2) | |
1063 | port)) | |
afb47f6d TTN |
1064 | (receive (i f) |
1065 | (priv:split-real (/ | |
5bbfe8cb RB |
1066 | (date-nanosecond date) |
1067 | priv:nano 1.0)) | |
1068 | (let* ((ns (number->string f)) | |
1069 | (le (string-length ns))) | |
1070 | (if (> le 2) | |
1071 | (begin | |
1072 | (display priv:locale-number-separator port) | |
1073 | (display (substring ns 2 le) port))))))) | |
1074 | (cons #\h (lambda (date pad-with port) | |
1075 | (display (date->string date "~b") port))) | |
1076 | (cons #\H (lambda (date pad-with port) | |
1077 | (display (priv:padding (date-hour date) | |
1078 | pad-with 2) | |
1079 | port))) | |
1080 | (cons #\I (lambda (date pad-with port) | |
1081 | (let ((hr (date-hour date))) | |
1082 | (if (> hr 12) | |
1083 | (display (priv:padding (- hr 12) | |
1084 | pad-with 2) | |
1085 | port) | |
1086 | (display (priv:padding hr | |
1087 | pad-with 2) | |
1088 | port))))) | |
1089 | (cons #\j (lambda (date pad-with port) | |
1090 | (display (priv:padding (date-year-day date) | |
1091 | pad-with 3) | |
1092 | port))) | |
1093 | (cons #\k (lambda (date pad-with port) | |
1094 | (display (priv:padding (date-hour date) | |
1095 | #\Space 2) | |
1096 | port))) | |
1097 | (cons #\l (lambda (date pad-with port) | |
1098 | (let ((hr (if (> (date-hour date) 12) | |
1099 | (- (date-hour date) 12) (date-hour date)))) | |
1100 | (display (priv:padding hr #\Space 2) | |
1101 | port)))) | |
1102 | (cons #\m (lambda (date pad-with port) | |
1103 | (display (priv:padding (date-month date) | |
1104 | pad-with 2) | |
1105 | port))) | |
1106 | (cons #\M (lambda (date pad-with port) | |
1107 | (display (priv:padding (date-minute date) | |
1108 | pad-with 2) | |
1109 | port))) | |
1110 | (cons #\n (lambda (date pad-with port) | |
1111 | (newline port))) | |
1112 | (cons #\N (lambda (date pad-with port) | |
1113 | (display (priv:padding (date-nanosecond date) | |
1114 | pad-with 7) | |
1115 | port))) | |
1116 | (cons #\p (lambda (date pad-with port) | |
1117 | (display (priv:locale-am/pm (date-hour date)) port))) | |
1118 | (cons #\r (lambda (date pad-with port) | |
1119 | (display (date->string date "~I:~M:~S ~p") port))) | |
1120 | (cons #\s (lambda (date pad-with port) | |
1121 | (display (time-second (date->time-utc date)) port))) | |
1122 | (cons #\S (lambda (date pad-with port) | |
1123 | (if (> (date-nanosecond date) | |
1124 | priv:nano) | |
1125 | (display (priv:padding (+ (date-second date) 1) | |
1126 | pad-with 2) | |
1127 | port) | |
1128 | (display (priv:padding (date-second date) | |
1129 | pad-with 2) | |
1130 | port)))) | |
1131 | (cons #\t (lambda (date pad-with port) | |
1132 | (display #\Tab port))) | |
1133 | (cons #\T (lambda (date pad-with port) | |
1134 | (display (date->string date "~H:~M:~S") port))) | |
1135 | (cons #\U (lambda (date pad-with port) | |
1136 | (if (> (priv:days-before-first-week date 0) 0) | |
1137 | (display (priv:padding (+ (date-week-number date 0) 1) | |
1138 | #\0 2) port) | |
1139 | (display (priv:padding (date-week-number date 0) | |
1140 | #\0 2) port)))) | |
1141 | (cons #\V (lambda (date pad-with port) | |
1142 | (display (priv:padding (date-week-number date 1) | |
1143 | #\0 2) port))) | |
1144 | (cons #\w (lambda (date pad-with port) | |
1145 | (display (date-week-day date) port))) | |
1146 | (cons #\x (lambda (date pad-with port) | |
1147 | (display (date->string date priv:locale-short-date-format) port))) | |
1148 | (cons #\X (lambda (date pad-with port) | |
1149 | (display (date->string date priv:locale-time-format) port))) | |
1150 | (cons #\W (lambda (date pad-with port) | |
1151 | (if (> (priv:days-before-first-week date 1) 0) | |
1152 | (display (priv:padding (+ (date-week-number date 1) 1) | |
1153 | #\0 2) port) | |
1154 | (display (priv:padding (date-week-number date 1) | |
1155 | #\0 2) port)))) | |
1156 | (cons #\y (lambda (date pad-with port) | |
afb47f6d | 1157 | (display (priv:padding (priv:last-n-digits |
5bbfe8cb RB |
1158 | (date-year date) 2) |
1159 | pad-with | |
1160 | 2) | |
1161 | port))) | |
1162 | (cons #\Y (lambda (date pad-with port) | |
1163 | (display (date-year date) port))) | |
1164 | (cons #\z (lambda (date pad-with port) | |
1165 | (priv:tz-printer (date-zone-offset date) port))) | |
1166 | (cons #\Z (lambda (date pad-with port) | |
1167 | (priv:locale-print-time-zone date port))) | |
1168 | (cons #\1 (lambda (date pad-with port) | |
1169 | (display (date->string date "~Y-~m-~d") port))) | |
1170 | (cons #\2 (lambda (date pad-with port) | |
1171 | (display (date->string date "~k:~M:~S~z") port))) | |
1172 | (cons #\3 (lambda (date pad-with port) | |
1173 | (display (date->string date "~k:~M:~S") port))) | |
1174 | (cons #\4 (lambda (date pad-with port) | |
1175 | (display (date->string date "~Y-~m-~dT~k:~M:~S~z") port))) | |
1176 | (cons #\5 (lambda (date pad-with port) | |
1177 | (display (date->string date "~Y-~m-~dT~k:~M:~S") port))))) | |
1178 | ||
1179 | ||
1180 | (define (priv:get-formatter char) | |
1181 | (let ((associated (assoc char priv:directives))) | |
1182 | (if associated (cdr associated) #f))) | |
1183 | ||
1184 | (define (priv:date-printer date index format-string str-len port) | |
1185 | (if (>= index str-len) | |
1186 | (values) | |
1187 | (let ((current-char (string-ref format-string index))) | |
1188 | (if (not (char=? current-char #\~)) | |
1189 | (begin | |
1190 | (display current-char port) | |
1191 | (priv:date-printer date (+ index 1) format-string str-len port)) | |
1192 | (if (= (+ index 1) str-len) ; bad format string. | |
afb47f6d | 1193 | (priv:time-error 'priv:date-printer 'bad-date-format-string |
5bbfe8cb RB |
1194 | format-string) |
1195 | (let ((pad-char? (string-ref format-string (+ index 1)))) | |
1196 | (cond | |
1197 | ((char=? pad-char? #\-) | |
1198 | (if (= (+ index 2) str-len) ; bad format string. | |
1199 | (priv:time-error 'priv:date-printer | |
afb47f6d | 1200 | 'bad-date-format-string |
5bbfe8cb | 1201 | format-string) |
afb47f6d | 1202 | (let ((formatter (priv:get-formatter |
5bbfe8cb RB |
1203 | (string-ref format-string |
1204 | (+ index 2))))) | |
1205 | (if (not formatter) | |
1206 | (priv:time-error 'priv:date-printer | |
afb47f6d | 1207 | 'bad-date-format-string |
5bbfe8cb RB |
1208 | format-string) |
1209 | (begin | |
1210 | (formatter date #f port) | |
1211 | (priv:date-printer date | |
1212 | (+ index 3) | |
1213 | format-string | |
1214 | str-len | |
1215 | port)))))) | |
afb47f6d | 1216 | |
5bbfe8cb RB |
1217 | ((char=? pad-char? #\_) |
1218 | (if (= (+ index 2) str-len) ; bad format string. | |
1219 | (priv:time-error 'priv:date-printer | |
afb47f6d | 1220 | 'bad-date-format-string |
5bbfe8cb | 1221 | format-string) |
afb47f6d | 1222 | (let ((formatter (priv:get-formatter |
5bbfe8cb RB |
1223 | (string-ref format-string |
1224 | (+ index 2))))) | |
1225 | (if (not formatter) | |
1226 | (priv:time-error 'priv:date-printer | |
afb47f6d | 1227 | 'bad-date-format-string |
5bbfe8cb RB |
1228 | format-string) |
1229 | (begin | |
1230 | (formatter date #\Space port) | |
1231 | (priv:date-printer date | |
1232 | (+ index 3) | |
1233 | format-string | |
1234 | str-len | |
1235 | port)))))) | |
1236 | (else | |
afb47f6d | 1237 | (let ((formatter (priv:get-formatter |
5bbfe8cb RB |
1238 | (string-ref format-string |
1239 | (+ index 1))))) | |
1240 | (if (not formatter) | |
1241 | (priv:time-error 'priv:date-printer | |
afb47f6d | 1242 | 'bad-date-format-string |
5bbfe8cb RB |
1243 | format-string) |
1244 | (begin | |
1245 | (formatter date #\0 port) | |
1246 | (priv:date-printer date | |
1247 | (+ index 2) | |
1248 | format-string | |
1249 | str-len | |
1250 | port)))))))))))) | |
1251 | ||
1252 | ||
1253 | (define (date->string date . format-string) | |
1254 | (let ((str-port (open-output-string)) | |
5e1fb41f | 1255 | (fmt-str (if (null? format-string) "~c" (car format-string)))) |
5bbfe8cb RB |
1256 | (priv:date-printer date 0 fmt-str (string-length fmt-str) str-port) |
1257 | (get-output-string str-port))) | |
1258 | ||
1259 | (define (priv:char->int ch) | |
1260 | (case ch | |
1261 | ((#\0) 0) | |
1262 | ((#\1) 1) | |
1263 | ((#\2) 2) | |
1264 | ((#\3) 3) | |
1265 | ((#\4) 4) | |
1266 | ((#\5) 5) | |
1267 | ((#\6) 6) | |
1268 | ((#\7) 7) | |
1269 | ((#\8) 8) | |
1270 | ((#\9) 9) | |
1271 | (else (priv:time-error 'bad-date-template-string | |
1272 | (list "Non-integer character" ch i))))) | |
1273 | ||
1274 | ;; read an integer upto n characters long on port; upto -> #f is any length | |
1275 | (define (priv:integer-reader upto port) | |
1276 | (let loop ((accum 0) (nchars 0)) | |
1277 | (let ((ch (peek-char port))) | |
1278 | (if (or (eof-object? ch) | |
1279 | (not (char-numeric? ch)) | |
1280 | (and upto (>= nchars upto))) | |
1281 | accum | |
4549ba4a | 1282 | (loop (+ (* accum 10) (priv:char->int (read-char port))) |
5bbfe8cb RB |
1283 | (+ nchars 1)))))) |
1284 | ||
1285 | (define (priv:make-integer-reader upto) | |
1286 | (lambda (port) | |
1287 | (priv:integer-reader upto port))) | |
1288 | ||
1289 | ;; read *exactly* n characters and convert to integer; could be padded | |
1290 | (define (priv:integer-reader-exact n port) | |
1291 | (let ((padding-ok #t)) | |
1292 | (define (accum-int port accum nchars) | |
1293 | (let ((ch (peek-char port))) | |
5a1920de RB |
1294 | (cond |
1295 | ((>= nchars n) accum) | |
afb47f6d TTN |
1296 | ((eof-object? ch) |
1297 | (priv:time-error 'string->date 'bad-date-template-string | |
5bbfe8cb | 1298 | "Premature ending to integer read.")) |
5a1920de RB |
1299 | ((char-numeric? ch) |
1300 | (set! padding-ok #f) | |
1301 | (accum-int port | |
1302 | (+ (* accum 10) (priv:char->int (read-char port))) | |
1303 | (+ nchars 1))) | |
1304 | (padding-ok | |
1305 | (read-char port) ; consume padding | |
1306 | (accum-int port accum (+ nchars 1))) | |
1307 | (else ; padding where it shouldn't be | |
afb47f6d | 1308 | (priv:time-error 'string->date 'bad-date-template-string |
5bbfe8cb RB |
1309 | "Non-numeric characters in integer read."))))) |
1310 | (accum-int port 0 0))) | |
1311 | ||
1312 | ||
1313 | (define (priv:make-integer-exact-reader n) | |
1314 | (lambda (port) | |
1315 | (priv:integer-reader-exact n port))) | |
1316 | ||
afb47f6d TTN |
1317 | (define (priv:zone-reader port) |
1318 | (let ((offset 0) | |
5bbfe8cb RB |
1319 | (positive? #f)) |
1320 | (let ((ch (read-char port))) | |
1321 | (if (eof-object? ch) | |
1322 | (priv:time-error 'string->date 'bad-date-template-string | |
1323 | (list "Invalid time zone +/-" ch))) | |
1324 | (if (or (char=? ch #\Z) (char=? ch #\z)) | |
1325 | 0 | |
1326 | (begin | |
1327 | (cond | |
1328 | ((char=? ch #\+) (set! positive? #t)) | |
1329 | ((char=? ch #\-) (set! positive? #f)) | |
1330 | (else | |
1331 | (priv:time-error 'string->date 'bad-date-template-string | |
1332 | (list "Invalid time zone +/-" ch)))) | |
1333 | (let ((ch (read-char port))) | |
1334 | (if (eof-object? ch) | |
1335 | (priv:time-error 'string->date 'bad-date-template-string | |
1336 | (list "Invalid time zone number" ch))) | |
1337 | (set! offset (* (priv:char->int ch) | |
1338 | 10 60 60))) | |
1339 | (let ((ch (read-char port))) | |
1340 | (if (eof-object? ch) | |
1341 | (priv:time-error 'string->date 'bad-date-template-string | |
1342 | (list "Invalid time zone number" ch))) | |
1343 | (set! offset (+ offset (* (priv:char->int ch) | |
1344 | 60 60)))) | |
1345 | (let ((ch (read-char port))) | |
1346 | (if (eof-object? ch) | |
1347 | (priv:time-error 'string->date 'bad-date-template-string | |
1348 | (list "Invalid time zone number" ch))) | |
1349 | (set! offset (+ offset (* (priv:char->int ch) | |
1350 | 10 60)))) | |
1351 | (let ((ch (read-char port))) | |
1352 | (if (eof-object? ch) | |
1353 | (priv:time-error 'string->date 'bad-date-template-string | |
1354 | (list "Invalid time zone number" ch))) | |
1355 | (set! offset (+ offset (* (priv:char->int ch) | |
1356 | 60)))) | |
1357 | (if positive? offset (- offset))))))) | |
1358 | ||
1359 | ;; looking at a char, read the char string, run thru indexer, return index | |
1360 | (define (priv:locale-reader port indexer) | |
b4d2a48e RB |
1361 | |
1362 | (define (read-char-string result) | |
1363 | (let ((ch (peek-char port))) | |
1364 | (if (char-alphabetic? ch) | |
1365 | (read-char-string (cons (read-char port) result)) | |
1366 | (list->string (reverse! result))))) | |
afb47f6d TTN |
1367 | |
1368 | (let* ((str (read-char-string '())) | |
b4d2a48e RB |
1369 | (index (indexer str))) |
1370 | (if index index (priv:time-error 'string->date | |
1371 | 'bad-date-template-string | |
1372 | (list "Invalid string for " indexer))))) | |
5bbfe8cb RB |
1373 | |
1374 | (define (priv:make-locale-reader indexer) | |
1375 | (lambda (port) | |
1376 | (priv:locale-reader port indexer))) | |
1377 | ||
1378 | (define (priv:make-char-id-reader char) | |
1379 | (lambda (port) | |
1380 | (if (char=? char (read-char port)) | |
1381 | char | |
1382 | (priv:time-error 'string->date | |
1383 | 'bad-date-template-string | |
1384 | "Invalid character match.")))) | |
1385 | ||
1386 | ;; A List of formatted read directives. | |
1387 | ;; Each entry is a list. | |
afb47f6d | 1388 | ;; 1. the character directive; |
5bbfe8cb RB |
1389 | ;; a procedure, which takes a character as input & returns |
1390 | ;; 2. #t as soon as a character on the input port is acceptable | |
1391 | ;; for input, | |
1392 | ;; 3. a port reader procedure that knows how to read the current port | |
1393 | ;; for a value. Its one parameter is the port. | |
1394 | ;; 4. a action procedure, that takes the value (from 3.) and some | |
1395 | ;; object (here, always the date) and (probably) side-effects it. | |
1396 | ;; In some cases (e.g., ~A) the action is to do nothing | |
1397 | ||
afb47f6d | 1398 | (define priv:read-directives |
5bbfe8cb RB |
1399 | (let ((ireader4 (priv:make-integer-reader 4)) |
1400 | (ireader2 (priv:make-integer-reader 2)) | |
1401 | (ireaderf (priv:make-integer-reader #f)) | |
1402 | (eireader2 (priv:make-integer-exact-reader 2)) | |
1403 | (eireader4 (priv:make-integer-exact-reader 4)) | |
1404 | (locale-reader-abbr-weekday (priv:make-locale-reader | |
1405 | priv:locale-abbr-weekday->index)) | |
1406 | (locale-reader-long-weekday (priv:make-locale-reader | |
1407 | priv:locale-long-weekday->index)) | |
1408 | (locale-reader-abbr-month (priv:make-locale-reader | |
1409 | priv:locale-abbr-month->index)) | |
1410 | (locale-reader-long-month (priv:make-locale-reader | |
1411 | priv:locale-long-month->index)) | |
1412 | (char-fail (lambda (ch) #t)) | |
1413 | (do-nothing (lambda (val object) (values)))) | |
afb47f6d | 1414 | |
5bbfe8cb RB |
1415 | (list |
1416 | (list #\~ char-fail (priv:make-char-id-reader #\~) do-nothing) | |
1417 | (list #\a char-alphabetic? locale-reader-abbr-weekday do-nothing) | |
1418 | (list #\A char-alphabetic? locale-reader-long-weekday do-nothing) | |
1419 | (list #\b char-alphabetic? locale-reader-abbr-month | |
1420 | (lambda (val object) | |
4549ba4a | 1421 | (set-date-month! object val))) |
5bbfe8cb RB |
1422 | (list #\B char-alphabetic? locale-reader-long-month |
1423 | (lambda (val object) | |
4549ba4a | 1424 | (set-date-month! object val))) |
5bbfe8cb | 1425 | (list #\d char-numeric? ireader2 (lambda (val object) |
4549ba4a | 1426 | (set-date-day! |
5bbfe8cb RB |
1427 | object val))) |
1428 | (list #\e char-fail eireader2 (lambda (val object) | |
4549ba4a | 1429 | (set-date-day! object val))) |
5bbfe8cb RB |
1430 | (list #\h char-alphabetic? locale-reader-abbr-month |
1431 | (lambda (val object) | |
4549ba4a | 1432 | (set-date-month! object val))) |
5bbfe8cb | 1433 | (list #\H char-numeric? ireader2 (lambda (val object) |
4549ba4a | 1434 | (set-date-hour! object val))) |
5bbfe8cb | 1435 | (list #\k char-fail eireader2 (lambda (val object) |
4549ba4a | 1436 | (set-date-hour! object val))) |
5bbfe8cb | 1437 | (list #\m char-numeric? ireader2 (lambda (val object) |
4549ba4a | 1438 | (set-date-month! object val))) |
5bbfe8cb | 1439 | (list #\M char-numeric? ireader2 (lambda (val object) |
4549ba4a | 1440 | (set-date-minute! |
5bbfe8cb RB |
1441 | object val))) |
1442 | (list #\S char-numeric? ireader2 (lambda (val object) | |
4549ba4a | 1443 | (set-date-second! object val))) |
afb47f6d | 1444 | (list #\y char-fail eireader2 |
5bbfe8cb | 1445 | (lambda (val object) |
4549ba4a | 1446 | (set-date-year! object (priv:natural-year val)))) |
5bbfe8cb | 1447 | (list #\Y char-numeric? ireader4 (lambda (val object) |
4549ba4a | 1448 | (set-date-year! object val))) |
5bbfe8cb RB |
1449 | (list #\z (lambda (c) |
1450 | (or (char=? c #\Z) | |
1451 | (char=? c #\z) | |
1452 | (char=? c #\+) | |
1453 | (char=? c #\-))) | |
1454 | priv:zone-reader (lambda (val object) | |
4549ba4a | 1455 | (set-date-zone-offset! object val)))))) |
5bbfe8cb RB |
1456 | |
1457 | (define (priv:string->date date index format-string str-len port template-string) | |
1458 | (define (skip-until port skipper) | |
1459 | (let ((ch (peek-char port))) | |
1460 | (if (eof-object? port) | |
1461 | (priv:time-error 'string->date 'bad-date-format-string template-string) | |
1462 | (if (not (skipper ch)) | |
1463 | (begin (read-char port) (skip-until port skipper)))))) | |
1464 | (if (>= index str-len) | |
afb47f6d | 1465 | (begin |
5bbfe8cb RB |
1466 | (values)) |
1467 | (let ((current-char (string-ref format-string index))) | |
1468 | (if (not (char=? current-char #\~)) | |
1469 | (let ((port-char (read-char port))) | |
1470 | (if (or (eof-object? port-char) | |
1471 | (not (char=? current-char port-char))) | |
1472 | (priv:time-error 'string->date | |
1473 | 'bad-date-format-string template-string)) | |
1474 | (priv:string->date date | |
1475 | (+ index 1) | |
1476 | format-string | |
1477 | str-len | |
1478 | port | |
1479 | template-string)) | |
1480 | ;; otherwise, it's an escape, we hope | |
1481 | (if (> (+ index 1) str-len) | |
1482 | (priv:time-error 'string->date | |
1483 | 'bad-date-format-string template-string) | |
1484 | (let* ((format-char (string-ref format-string (+ index 1))) | |
1485 | (format-info (assoc format-char priv:read-directives))) | |
1486 | (if (not format-info) | |
1487 | (priv:time-error 'string->date | |
1488 | 'bad-date-format-string template-string) | |
1489 | (begin | |
1490 | (let ((skipper (cadr format-info)) | |
1491 | (reader (caddr format-info)) | |
1492 | (actor (cadddr format-info))) | |
1493 | (skip-until port skipper) | |
1494 | (let ((val (reader port))) | |
1495 | (if (eof-object? val) | |
1496 | (priv:time-error 'string->date | |
1497 | 'bad-date-format-string | |
1498 | template-string) | |
1499 | (actor val date))) | |
1500 | (priv:string->date date | |
1501 | (+ index 2) | |
afb47f6d | 1502 | format-string |
5bbfe8cb RB |
1503 | str-len |
1504 | port | |
1505 | template-string)))))))))) | |
1506 | ||
1507 | (define (string->date input-string template-string) | |
1508 | (define (priv:date-ok? date) | |
1509 | (and (date-nanosecond date) | |
1510 | (date-second date) | |
1511 | (date-minute date) | |
1512 | (date-hour date) | |
1513 | (date-day date) | |
1514 | (date-month date) | |
1515 | (date-year date) | |
1516 | (date-zone-offset date))) | |
4549ba4a | 1517 | (let ((newdate (make-date 0 0 0 0 #f #f #f #f))) |
5bbfe8cb RB |
1518 | (priv:string->date newdate |
1519 | 0 | |
1520 | template-string | |
1521 | (string-length template-string) | |
1522 | (open-input-string input-string) | |
1523 | template-string) | |
4549ba4a MV |
1524 | (if (not (date-zone-offset newdate)) |
1525 | (begin | |
1526 | ;; this is necessary to get DST right -- as far as we can | |
1527 | ;; get it right (think of the double/missing hour in the | |
1528 | ;; night when we are switching between normal time and DST). | |
1529 | (set-date-zone-offset! newdate | |
afb47f6d | 1530 | (priv:local-tz-offset |
4549ba4a MV |
1531 | (make-time time-utc 0 0))) |
1532 | (set-date-zone-offset! newdate | |
afb47f6d | 1533 | (priv:local-tz-offset |
4549ba4a | 1534 | (date->time-utc newdate))))) |
5bbfe8cb RB |
1535 | (if (priv:date-ok? newdate) |
1536 | newdate | |
1537 | (priv:time-error | |
1538 | 'string->date | |
1539 | 'bad-date-format-string | |
1540 | (list "Incomplete date read. " newdate template-string))))) | |
afb47f6d TTN |
1541 | |
1542 | ;;; srfi-19.scm ends here |