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6be07c52 TTN |
1 | ;;; srfi-19.scm --- Time/Date Library |
2 | ||
bf0d59e5 MW |
3 | ;; Copyright (C) 2001, 2002, 2003, 2005, 2006, 2007, 2008, 2009, 2010, |
4 | ;; 2011, 2014 Free Software Foundation, Inc. | |
6be07c52 | 5 | ;; |
73be1d9e MV |
6 | ;; This library is free software; you can redistribute it and/or |
7 | ;; modify it under the terms of the GNU Lesser General Public | |
8 | ;; License as published by the Free Software Foundation; either | |
83ba2d37 | 9 | ;; version 3 of the License, or (at your option) any later version. |
73be1d9e MV |
10 | ;; |
11 | ;; This library is distributed in the hope that it will be useful, | |
6be07c52 TTN |
12 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
73be1d9e MV |
14 | ;; Lesser General Public License for more details. |
15 | ;; | |
16 | ;; You should have received a copy of the GNU Lesser General Public | |
17 | ;; License along with this library; if not, write to the Free Software | |
92205699 | 18 | ;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
6be07c52 TTN |
19 | |
20 | ;;; Author: Rob Browning <rlb@cs.utexas.edu> | |
21 | ;;; Originally from SRFI reference implementation by Will Fitzgerald. | |
0706ae06 TTN |
22 | |
23 | ;;; Commentary: | |
24 | ||
0706ae06 TTN |
25 | ;; This module is fully documented in the Guile Reference Manual. |
26 | ||
27 | ;;; Code: | |
5bbfe8cb RB |
28 | |
29 | ;; FIXME: I haven't checked a decent amount of this code for potential | |
30 | ;; performance improvements, but I suspect that there may be some | |
31 | ;; substantial ones to be realized, esp. in the later "parsing" half | |
32 | ;; of the file, by rewriting the code with use of more Guile native | |
33 | ;; functions that do more work in a "chunk". | |
4549ba4a MV |
34 | ;; |
35 | ;; FIXME: mkoeppe: Time zones are treated a little simplistic in | |
36 | ;; SRFI-19; they are only a numeric offset. Thus, printing time zones | |
abab34ce | 37 | ;; (LOCALE-PRINT-TIME-ZONE) can't be implemented sensibly. The |
4549ba4a MV |
38 | ;; functions taking an optional TZ-OFFSET should be extended to take a |
39 | ;; symbolic time-zone (like "CET"); this string should be stored in | |
40 | ;; the DATE structure. | |
5bbfe8cb RB |
41 | |
42 | (define-module (srfi srfi-19) | |
5bbfe8cb RB |
43 | :use-module (srfi srfi-6) |
44 | :use-module (srfi srfi-8) | |
a2f00b9b | 45 | :use-module (srfi srfi-9) |
84012ef4 | 46 | :autoload (ice-9 rdelim) (read-line) |
bf943698 | 47 | :use-module (ice-9 i18n) |
d68a81e0 | 48 | :replace (current-time) |
bf943698 | 49 | :export (;; Constants |
5bbfe8cb RB |
50 | time-duration |
51 | time-monotonic | |
52 | time-process | |
53 | time-tai | |
54 | time-thread | |
55 | time-utc | |
56 | ;; Current time and clock resolution | |
57 | current-date | |
58 | current-julian-day | |
59 | current-modified-julian-day | |
5bbfe8cb RB |
60 | time-resolution |
61 | ;; Time object and accessors | |
62 | make-time | |
63 | time? | |
64 | time-type | |
65 | time-nanosecond | |
66 | time-second | |
67 | set-time-type! | |
68 | set-time-nanosecond! | |
69 | set-time-second! | |
70 | copy-time | |
71 | ;; Time comparison procedures | |
72 | time<=? | |
73 | time<? | |
74 | time=? | |
75 | time>=? | |
76 | time>? | |
77 | ;; Time arithmetic procedures | |
78 | time-difference | |
79 | time-difference! | |
80 | add-duration | |
81 | add-duration! | |
82 | subtract-duration | |
83 | subtract-duration! | |
84 | ;; Date object and accessors | |
85 | make-date | |
86 | date? | |
87 | date-nanosecond | |
88 | date-second | |
89 | date-minute | |
90 | date-hour | |
91 | date-day | |
92 | date-month | |
93 | date-year | |
4549ba4a | 94 | date-zone-offset |
5bbfe8cb RB |
95 | date-year-day |
96 | date-week-day | |
97 | date-week-number | |
98 | ;; Time/Date/Julian Day/Modified Julian Day converters | |
99 | date->julian-day | |
100 | date->modified-julian-day | |
101 | date->time-monotonic | |
102 | date->time-tai | |
103 | date->time-utc | |
104 | julian-day->date | |
105 | julian-day->time-monotonic | |
106 | julian-day->time-tai | |
107 | julian-day->time-utc | |
108 | modified-julian-day->date | |
109 | modified-julian-day->time-monotonic | |
110 | modified-julian-day->time-tai | |
111 | modified-julian-day->time-utc | |
112 | time-monotonic->date | |
bf943698 LC |
113 | time-monotonic->julian-day |
114 | time-monotonic->modified-julian-day | |
5bbfe8cb RB |
115 | time-monotonic->time-tai |
116 | time-monotonic->time-tai! | |
117 | time-monotonic->time-utc | |
118 | time-monotonic->time-utc! | |
119 | time-tai->date | |
120 | time-tai->julian-day | |
121 | time-tai->modified-julian-day | |
122 | time-tai->time-monotonic | |
123 | time-tai->time-monotonic! | |
124 | time-tai->time-utc | |
125 | time-tai->time-utc! | |
126 | time-utc->date | |
127 | time-utc->julian-day | |
128 | time-utc->modified-julian-day | |
129 | time-utc->time-monotonic | |
130 | time-utc->time-monotonic! | |
131 | time-utc->time-tai | |
132 | time-utc->time-tai! | |
133 | ;; Date to string/string to date converters. | |
134 | date->string | |
bf943698 | 135 | string->date)) |
5bbfe8cb | 136 | |
1b2f40b9 MG |
137 | (cond-expand-provide (current-module) '(srfi-19)) |
138 | ||
5bbfe8cb RB |
139 | (define time-tai 'time-tai) |
140 | (define time-utc 'time-utc) | |
141 | (define time-monotonic 'time-monotonic) | |
142 | (define time-thread 'time-thread) | |
143 | (define time-process 'time-process) | |
144 | (define time-duration 'time-duration) | |
145 | ||
146 | ;; FIXME: do we want to add gc time? | |
147 | ;; (define time-gc 'time-gc) | |
148 | ||
149 | ;;-- LOCALE dependent constants | |
150 | ||
5bbfe8cb | 151 | ;; See date->string |
abab34ce AW |
152 | (define locale-date-time-format "~a ~b ~d ~H:~M:~S~z ~Y") |
153 | (define locale-short-date-format "~m/~d/~y") | |
154 | (define locale-time-format "~H:~M:~S") | |
155 | (define iso-8601-date-time-format "~Y-~m-~dT~H:~M:~S~z") | |
5bbfe8cb RB |
156 | |
157 | ;;-- Miscellaneous Constants. | |
abab34ce | 158 | ;;-- only the tai-epoch-in-jd might need changing if |
5bbfe8cb RB |
159 | ;; a different epoch is used. |
160 | ||
abab34ce AW |
161 | (define nano 1000000000) ; nanoseconds in a second |
162 | (define sid 86400) ; seconds in a day | |
163 | (define sihd 43200) ; seconds in a half day | |
164 | (define tai-epoch-in-jd 4881175/2) ; julian day number for 'the epoch' | |
5bbfe8cb RB |
165 | |
166 | ;; FIXME: should this be something other than misc-error? | |
abab34ce | 167 | (define (time-error caller type value) |
5bbfe8cb RB |
168 | (if value |
169 | (throw 'misc-error caller "TIME-ERROR type ~A: ~S" (list type value) #f) | |
170 | (throw 'misc-error caller "TIME-ERROR type ~A" (list type) #f))) | |
171 | ||
172 | ;; A table of leap seconds | |
173 | ;; See ftp://maia.usno.navy.mil/ser7/tai-utc.dat | |
174 | ;; and update as necessary. | |
bf0d59e5 | 175 | ;; this procedures reads the file in the above |
5bbfe8cb | 176 | ;; format and creates the leap second table |
afb47f6d | 177 | ;; it also calls the almost standard, but not R5 procedures read-line |
5bbfe8cb | 178 | ;; & open-input-string |
abab34ce | 179 | ;; ie (set! leap-second-table (read-tai-utc-date "tai-utc.dat")) |
5bbfe8cb | 180 | |
abab34ce | 181 | (define (read-tai-utc-data filename) |
5bbfe8cb | 182 | (define (convert-jd jd) |
abab34ce | 183 | (* (- (inexact->exact jd) tai-epoch-in-jd) sid)) |
5bbfe8cb RB |
184 | (define (convert-sec sec) |
185 | (inexact->exact sec)) | |
186 | (let ((port (open-input-file filename)) | |
187 | (table '())) | |
188 | (let loop ((line (read-line port))) | |
994e8417 | 189 | (if (not (eof-object? line)) |
5bbfe8cb RB |
190 | (begin |
191 | (let* ((data (read (open-input-string | |
afb47f6d | 192 | (string-append "(" line ")")))) |
5bbfe8cb RB |
193 | (year (car data)) |
194 | (jd (cadddr (cdr data))) | |
195 | (secs (cadddr (cdddr data)))) | |
196 | (if (>= year 1972) | |
197 | (set! table (cons | |
198 | (cons (convert-jd jd) (convert-sec secs)) | |
199 | table))) | |
200 | (loop (read-line port)))))) | |
201 | table)) | |
202 | ||
203 | ;; each entry is (tai seconds since epoch . # seconds to subtract for utc) | |
204 | ;; note they go higher to lower, and end in 1972. | |
abab34ce | 205 | (define leap-second-table |
bf0d59e5 MW |
206 | '((1341100800 . 35) |
207 | (1230768000 . 34) | |
208 | (1136073600 . 33) | |
73e2a8d1 | 209 | (915148800 . 32) |
5bbfe8cb RB |
210 | (867715200 . 31) |
211 | (820454400 . 30) | |
212 | (773020800 . 29) | |
213 | (741484800 . 28) | |
214 | (709948800 . 27) | |
215 | (662688000 . 26) | |
216 | (631152000 . 25) | |
217 | (567993600 . 24) | |
218 | (489024000 . 23) | |
219 | (425865600 . 22) | |
220 | (394329600 . 21) | |
221 | (362793600 . 20) | |
222 | (315532800 . 19) | |
223 | (283996800 . 18) | |
224 | (252460800 . 17) | |
225 | (220924800 . 16) | |
226 | (189302400 . 15) | |
227 | (157766400 . 14) | |
228 | (126230400 . 13) | |
229 | (94694400 . 12) | |
230 | (78796800 . 11) | |
231 | (63072000 . 10))) | |
232 | ||
233 | (define (read-leap-second-table filename) | |
abab34ce | 234 | (set! leap-second-table (read-tai-utc-data filename))) |
5bbfe8cb RB |
235 | |
236 | ||
abab34ce | 237 | (define (leap-second-delta utc-seconds) |
5bbfe8cb RB |
238 | (letrec ((lsd (lambda (table) |
239 | (cond ((>= utc-seconds (caar table)) | |
240 | (cdar table)) | |
241 | (else (lsd (cdr table))))))) | |
abab34ce AW |
242 | (if (< utc-seconds (* (- 1972 1970) 365 sid)) 0 |
243 | (lsd leap-second-table)))) | |
5bbfe8cb RB |
244 | |
245 | ||
246 | ;;; the TIME structure; creates the accessors, too. | |
247 | ||
248 | (define-record-type time | |
249 | (make-time-unnormalized type nanosecond second) | |
250 | time? | |
251 | (type time-type set-time-type!) | |
252 | (nanosecond time-nanosecond set-time-nanosecond!) | |
253 | (second time-second set-time-second!)) | |
254 | ||
255 | (define (copy-time time) | |
256 | (make-time (time-type time) (time-nanosecond time) (time-second time))) | |
257 | ||
abab34ce | 258 | (define (split-real r) |
b21cccf3 MD |
259 | (if (integer? r) |
260 | (values (inexact->exact r) 0) | |
4549ba4a MV |
261 | (let ((l (truncate r))) |
262 | (values (inexact->exact l) (- r l))))) | |
263 | ||
abab34ce | 264 | (define (time-normalize! t) |
5bbfe8cb | 265 | (if (>= (abs (time-nanosecond t)) 1000000000) |
4549ba4a | 266 | (receive (int frac) |
abab34ce | 267 | (split-real (time-nanosecond t)) |
4549ba4a MV |
268 | (set-time-second! t (+ (time-second t) |
269 | (quotient int 1000000000))) | |
270 | (set-time-nanosecond! t (+ (remainder int 1000000000) | |
271 | frac)))) | |
5bbfe8cb RB |
272 | (if (and (positive? (time-second t)) |
273 | (negative? (time-nanosecond t))) | |
274 | (begin | |
275 | (set-time-second! t (- (time-second t) 1)) | |
276 | (set-time-nanosecond! t (+ 1000000000 (time-nanosecond t)))) | |
277 | (if (and (negative? (time-second t)) | |
278 | (positive? (time-nanosecond t))) | |
279 | (begin | |
280 | (set-time-second! t (+ (time-second t) 1)) | |
281 | (set-time-nanosecond! t (+ 1000000000 (time-nanosecond t)))))) | |
282 | t) | |
283 | ||
284 | (define (make-time type nanosecond second) | |
abab34ce | 285 | (time-normalize! (make-time-unnormalized type nanosecond second))) |
5bbfe8cb RB |
286 | |
287 | ;; Helpers | |
288 | ;; FIXME: finish this and publish it? | |
289 | (define (date->broken-down-time date) | |
290 | (let ((result (mktime 0))) | |
291 | ;; FIXME: What should we do about leap-seconds which may overflow | |
292 | ;; set-tm:sec? | |
293 | (set-tm:sec result (date-second date)) | |
294 | (set-tm:min result (date-minute date)) | |
295 | (set-tm:hour result (date-hour date)) | |
296 | ;; FIXME: SRFI day ranges from 0-31. (not compatible with set-tm:mday). | |
297 | (set-tm:mday result (date-day date)) | |
84012ef4 | 298 | (set-tm:mon result (- (date-month date) 1)) |
5bbfe8cb RB |
299 | ;; FIXME: need to signal error on range violation. |
300 | (set-tm:year result (+ 1900 (date-year date))) | |
301 | (set-tm:isdst result -1) | |
302 | (set-tm:gmtoff result (- (date-zone-offset date))) | |
303 | result)) | |
304 | ||
305 | ;;; current-time | |
306 | ||
307 | ;;; specific time getters. | |
308 | ||
abab34ce | 309 | (define (current-time-utc) |
5bbfe8cb RB |
310 | ;; Resolution is microseconds. |
311 | (let ((tod (gettimeofday))) | |
312 | (make-time time-utc (* (cdr tod) 1000) (car tod)))) | |
313 | ||
abab34ce | 314 | (define (current-time-tai) |
5bbfe8cb RB |
315 | ;; Resolution is microseconds. |
316 | (let* ((tod (gettimeofday)) | |
317 | (sec (car tod)) | |
318 | (usec (cdr tod))) | |
319 | (make-time time-tai | |
320 | (* usec 1000) | |
abab34ce | 321 | (+ (car tod) (leap-second-delta sec))))) |
5bbfe8cb | 322 | |
abab34ce | 323 | ;;(define (current-time-ms-time time-type proc) |
5bbfe8cb RB |
324 | ;; (let ((current-ms (proc))) |
325 | ;; (make-time time-type | |
326 | ;; (quotient current-ms 10000) | |
327 | ;; (* (remainder current-ms 1000) 10000)))) | |
328 | ||
329 | ;; -- we define it to be the same as TAI. | |
330 | ;; A different implemation of current-time-montonic | |
331 | ;; will require rewriting all of the time-monotonic converters, | |
332 | ;; of course. | |
333 | ||
abab34ce | 334 | (define (current-time-monotonic) |
5bbfe8cb | 335 | ;; Resolution is microseconds. |
abab34ce | 336 | (current-time-tai)) |
5bbfe8cb | 337 | |
abab34ce AW |
338 | (define (current-time-thread) |
339 | (time-error 'current-time 'unsupported-clock-type 'time-thread)) | |
5bbfe8cb | 340 | |
abab34ce | 341 | (define ns-per-guile-tick (/ 1000000000 internal-time-units-per-second)) |
5bbfe8cb | 342 | |
abab34ce | 343 | (define (current-time-process) |
5bbfe8cb RB |
344 | (let ((run-time (get-internal-run-time))) |
345 | (make-time | |
346 | time-process | |
5bbfe8cb | 347 | (* (remainder run-time internal-time-units-per-second) |
abab34ce | 348 | ns-per-guile-tick) |
5bbfe8cb RB |
349 | (quotient run-time internal-time-units-per-second)))) |
350 | ||
abab34ce AW |
351 | ;;(define (current-time-gc) |
352 | ;; (current-time-ms-time time-gc current-gc-milliseconds)) | |
5bbfe8cb RB |
353 | |
354 | (define (current-time . clock-type) | |
5e1fb41f | 355 | (let ((clock-type (if (null? clock-type) time-utc (car clock-type)))) |
5bbfe8cb | 356 | (cond |
abab34ce AW |
357 | ((eq? clock-type time-tai) (current-time-tai)) |
358 | ((eq? clock-type time-utc) (current-time-utc)) | |
359 | ((eq? clock-type time-monotonic) (current-time-monotonic)) | |
360 | ((eq? clock-type time-thread) (current-time-thread)) | |
361 | ((eq? clock-type time-process) (current-time-process)) | |
362 | ;; ((eq? clock-type time-gc) (current-time-gc)) | |
363 | (else (time-error 'current-time 'invalid-clock-type clock-type))))) | |
5bbfe8cb RB |
364 | |
365 | ;; -- Time Resolution | |
366 | ;; This is the resolution of the clock in nanoseconds. | |
367 | ;; This will be implementation specific. | |
368 | ||
369 | (define (time-resolution . clock-type) | |
5e1fb41f | 370 | (let ((clock-type (if (null? clock-type) time-utc (car clock-type)))) |
5bbfe8cb RB |
371 | (case clock-type |
372 | ((time-tai) 1000) | |
373 | ((time-utc) 1000) | |
374 | ((time-monotonic) 1000) | |
abab34ce | 375 | ((time-process) ns-per-guile-tick) |
5bbfe8cb RB |
376 | ;; ((eq? clock-type time-thread) 1000) |
377 | ;; ((eq? clock-type time-gc) 10000) | |
abab34ce | 378 | (else (time-error 'time-resolution 'invalid-clock-type clock-type))))) |
5bbfe8cb RB |
379 | |
380 | ;; -- Time comparisons | |
381 | ||
382 | (define (time=? t1 t2) | |
383 | ;; Arrange tests for speed and presume that t1 and t2 are actually times. | |
384 | ;; also presume it will be rare to check two times of different types. | |
385 | (and (= (time-second t1) (time-second t2)) | |
4549ba4a | 386 | (= (time-nanosecond t1) (time-nanosecond t2)) |
5bbfe8cb RB |
387 | (eq? (time-type t1) (time-type t2)))) |
388 | ||
389 | (define (time>? t1 t2) | |
390 | (or (> (time-second t1) (time-second t2)) | |
391 | (and (= (time-second t1) (time-second t2)) | |
392 | (> (time-nanosecond t1) (time-nanosecond t2))))) | |
393 | ||
394 | (define (time<? t1 t2) | |
395 | (or (< (time-second t1) (time-second t2)) | |
396 | (and (= (time-second t1) (time-second t2)) | |
397 | (< (time-nanosecond t1) (time-nanosecond t2))))) | |
398 | ||
399 | (define (time>=? t1 t2) | |
400 | (or (> (time-second t1) (time-second t2)) | |
401 | (and (= (time-second t1) (time-second t2)) | |
402 | (>= (time-nanosecond t1) (time-nanosecond t2))))) | |
403 | ||
404 | (define (time<=? t1 t2) | |
4549ba4a MV |
405 | (or (< (time-second t1) (time-second t2)) |
406 | (and (= (time-second t1) (time-second t2)) | |
407 | (<= (time-nanosecond t1) (time-nanosecond t2))))) | |
5bbfe8cb RB |
408 | |
409 | ;; -- Time arithmetic | |
410 | ||
411 | (define (time-difference! time1 time2) | |
412 | (let ((sec-diff (- (time-second time1) (time-second time2))) | |
413 | (nsec-diff (- (time-nanosecond time1) (time-nanosecond time2)))) | |
414 | (set-time-type! time1 time-duration) | |
415 | (set-time-second! time1 sec-diff) | |
416 | (set-time-nanosecond! time1 nsec-diff) | |
abab34ce | 417 | (time-normalize! time1))) |
5bbfe8cb RB |
418 | |
419 | (define (time-difference time1 time2) | |
420 | (let ((result (copy-time time1))) | |
421 | (time-difference! result time2))) | |
422 | ||
423 | (define (add-duration! t duration) | |
424 | (if (not (eq? (time-type duration) time-duration)) | |
abab34ce | 425 | (time-error 'add-duration 'not-duration duration) |
5bbfe8cb RB |
426 | (let ((sec-plus (+ (time-second t) (time-second duration))) |
427 | (nsec-plus (+ (time-nanosecond t) (time-nanosecond duration)))) | |
428 | (set-time-second! t sec-plus) | |
429 | (set-time-nanosecond! t nsec-plus) | |
abab34ce | 430 | (time-normalize! t)))) |
5bbfe8cb | 431 | |
4549ba4a | 432 | (define (add-duration t duration) |
5bbfe8cb | 433 | (let ((result (copy-time t))) |
afb47f6d | 434 | (add-duration! result duration))) |
5bbfe8cb RB |
435 | |
436 | (define (subtract-duration! t duration) | |
437 | (if (not (eq? (time-type duration) time-duration)) | |
abab34ce | 438 | (time-error 'add-duration 'not-duration duration) |
5bbfe8cb RB |
439 | (let ((sec-minus (- (time-second t) (time-second duration))) |
440 | (nsec-minus (- (time-nanosecond t) (time-nanosecond duration)))) | |
441 | (set-time-second! t sec-minus) | |
442 | (set-time-nanosecond! t nsec-minus) | |
abab34ce | 443 | (time-normalize! t)))) |
5bbfe8cb RB |
444 | |
445 | (define (subtract-duration time1 duration) | |
446 | (let ((result (copy-time time1))) | |
447 | (subtract-duration! result duration))) | |
448 | ||
449 | ;; -- Converters between types. | |
450 | ||
451 | (define (priv:time-tai->time-utc! time-in time-out caller) | |
452 | (if (not (eq? (time-type time-in) time-tai)) | |
abab34ce | 453 | (time-error caller 'incompatible-time-types time-in)) |
5bbfe8cb RB |
454 | (set-time-type! time-out time-utc) |
455 | (set-time-nanosecond! time-out (time-nanosecond time-in)) | |
456 | (set-time-second! time-out (- (time-second time-in) | |
abab34ce | 457 | (leap-second-delta |
5bbfe8cb RB |
458 | (time-second time-in)))) |
459 | time-out) | |
460 | ||
461 | (define (time-tai->time-utc time-in) | |
4549ba4a | 462 | (priv:time-tai->time-utc! time-in (make-time-unnormalized #f #f #f) 'time-tai->time-utc)) |
5bbfe8cb RB |
463 | |
464 | ||
465 | (define (time-tai->time-utc! time-in) | |
466 | (priv:time-tai->time-utc! time-in time-in 'time-tai->time-utc!)) | |
467 | ||
468 | (define (priv:time-utc->time-tai! time-in time-out caller) | |
469 | (if (not (eq? (time-type time-in) time-utc)) | |
abab34ce | 470 | (time-error caller 'incompatible-time-types time-in)) |
5bbfe8cb RB |
471 | (set-time-type! time-out time-tai) |
472 | (set-time-nanosecond! time-out (time-nanosecond time-in)) | |
473 | (set-time-second! time-out (+ (time-second time-in) | |
abab34ce | 474 | (leap-second-delta |
5bbfe8cb RB |
475 | (time-second time-in)))) |
476 | time-out) | |
477 | ||
478 | (define (time-utc->time-tai time-in) | |
4549ba4a | 479 | (priv:time-utc->time-tai! time-in (make-time-unnormalized #f #f #f) 'time-utc->time-tai)) |
5bbfe8cb RB |
480 | |
481 | (define (time-utc->time-tai! time-in) | |
482 | (priv:time-utc->time-tai! time-in time-in 'time-utc->time-tai!)) | |
483 | ||
484 | ;; -- these depend on time-monotonic having the same definition as time-tai! | |
485 | (define (time-monotonic->time-utc time-in) | |
486 | (if (not (eq? (time-type time-in) time-monotonic)) | |
abab34ce | 487 | (time-error 'time-monotonic->time-utc |
84012ef4 | 488 | 'incompatible-time-types time-in)) |
5bbfe8cb RB |
489 | (let ((ntime (copy-time time-in))) |
490 | (set-time-type! ntime time-tai) | |
491 | (priv:time-tai->time-utc! ntime ntime 'time-monotonic->time-utc))) | |
492 | ||
493 | (define (time-monotonic->time-utc! time-in) | |
494 | (if (not (eq? (time-type time-in) time-monotonic)) | |
abab34ce | 495 | (time-error 'time-monotonic->time-utc! |
84012ef4 | 496 | 'incompatible-time-types time-in)) |
5bbfe8cb | 497 | (set-time-type! time-in time-tai) |
84012ef4 | 498 | (priv:time-tai->time-utc! time-in time-in 'time-monotonic->time-utc)) |
5bbfe8cb RB |
499 | |
500 | (define (time-monotonic->time-tai time-in) | |
501 | (if (not (eq? (time-type time-in) time-monotonic)) | |
abab34ce | 502 | (time-error 'time-monotonic->time-tai |
84012ef4 | 503 | 'incompatible-time-types time-in)) |
5bbfe8cb RB |
504 | (let ((ntime (copy-time time-in))) |
505 | (set-time-type! ntime time-tai) | |
506 | ntime)) | |
507 | ||
508 | (define (time-monotonic->time-tai! time-in) | |
509 | (if (not (eq? (time-type time-in) time-monotonic)) | |
abab34ce | 510 | (time-error 'time-monotonic->time-tai! |
84012ef4 | 511 | 'incompatible-time-types time-in)) |
5bbfe8cb RB |
512 | (set-time-type! time-in time-tai) |
513 | time-in) | |
514 | ||
515 | (define (time-utc->time-monotonic time-in) | |
516 | (if (not (eq? (time-type time-in) time-utc)) | |
abab34ce | 517 | (time-error 'time-utc->time-monotonic |
84012ef4 | 518 | 'incompatible-time-types time-in)) |
4549ba4a | 519 | (let ((ntime (priv:time-utc->time-tai! time-in (make-time-unnormalized #f #f #f) |
5bbfe8cb RB |
520 | 'time-utc->time-monotonic))) |
521 | (set-time-type! ntime time-monotonic) | |
522 | ntime)) | |
523 | ||
524 | (define (time-utc->time-monotonic! time-in) | |
525 | (if (not (eq? (time-type time-in) time-utc)) | |
abab34ce | 526 | (time-error 'time-utc->time-monotonic! |
84012ef4 | 527 | 'incompatible-time-types time-in)) |
5bbfe8cb RB |
528 | (let ((ntime (priv:time-utc->time-tai! time-in time-in |
529 | 'time-utc->time-monotonic!))) | |
530 | (set-time-type! ntime time-monotonic) | |
531 | ntime)) | |
532 | ||
533 | (define (time-tai->time-monotonic time-in) | |
534 | (if (not (eq? (time-type time-in) time-tai)) | |
abab34ce | 535 | (time-error 'time-tai->time-monotonic |
84012ef4 | 536 | 'incompatible-time-types time-in)) |
5bbfe8cb RB |
537 | (let ((ntime (copy-time time-in))) |
538 | (set-time-type! ntime time-monotonic) | |
539 | ntime)) | |
540 | ||
541 | (define (time-tai->time-monotonic! time-in) | |
542 | (if (not (eq? (time-type time-in) time-tai)) | |
abab34ce | 543 | (time-error 'time-tai->time-monotonic! |
84012ef4 | 544 | 'incompatible-time-types time-in)) |
5bbfe8cb RB |
545 | (set-time-type! time-in time-monotonic) |
546 | time-in) | |
547 | ||
548 | ;; -- Date Structures | |
549 | ||
5e1fb41f RB |
550 | ;; FIXME: to be really safe, perhaps we should normalize the |
551 | ;; seconds/nanoseconds/minutes coming in to make-date... | |
552 | ||
5bbfe8cb | 553 | (define-record-type date |
5e1fb41f RB |
554 | (make-date nanosecond second minute |
555 | hour day month | |
556 | year | |
557 | zone-offset) | |
5bbfe8cb | 558 | date? |
4549ba4a MV |
559 | (nanosecond date-nanosecond set-date-nanosecond!) |
560 | (second date-second set-date-second!) | |
561 | (minute date-minute set-date-minute!) | |
562 | (hour date-hour set-date-hour!) | |
563 | (day date-day set-date-day!) | |
564 | (month date-month set-date-month!) | |
565 | (year date-year set-date-year!) | |
566 | (zone-offset date-zone-offset set-date-zone-offset!)) | |
5e1fb41f | 567 | |
5bbfe8cb | 568 | ;; gives the julian day which starts at noon. |
abab34ce | 569 | (define (encode-julian-day-number day month year) |
5bbfe8cb RB |
570 | (let* ((a (quotient (- 14 month) 12)) |
571 | (y (- (+ year 4800) a (if (negative? year) -1 0))) | |
572 | (m (- (+ month (* 12 a)) 3))) | |
573 | (+ day | |
574 | (quotient (+ (* 153 m) 2) 5) | |
575 | (* 365 y) | |
576 | (quotient y 4) | |
577 | (- (quotient y 100)) | |
578 | (quotient y 400) | |
579 | -32045))) | |
580 | ||
afb47f6d | 581 | ;; gives the seconds/date/month/year |
abab34ce | 582 | (define (decode-julian-day-number jdn) |
5e1fb41f | 583 | (let* ((days (inexact->exact (truncate jdn))) |
5bbfe8cb RB |
584 | (a (+ days 32044)) |
585 | (b (quotient (+ (* 4 a) 3) 146097)) | |
586 | (c (- a (quotient (* 146097 b) 4))) | |
587 | (d (quotient (+ (* 4 c) 3) 1461)) | |
588 | (e (- c (quotient (* 1461 d) 4))) | |
589 | (m (quotient (+ (* 5 e) 2) 153)) | |
590 | (y (+ (* 100 b) d -4800 (quotient m 10)))) | |
591 | (values ; seconds date month year | |
abab34ce | 592 | (* (- jdn days) sid) |
5bbfe8cb RB |
593 | (+ e (- (quotient (+ (* 153 m) 2) 5)) 1) |
594 | (+ m 3 (* -12 (quotient m 10))) | |
595 | (if (>= 0 y) (- y 1) y)))) | |
596 | ||
597 | ;; relies on the fact that we named our time zone accessor | |
598 | ;; differently from MzScheme's.... | |
599 | ;; This should be written to be OS specific. | |
600 | ||
abab34ce | 601 | (define (local-tz-offset utc-time) |
5bbfe8cb | 602 | ;; SRFI uses seconds West, but guile (and libc) use seconds East. |
4549ba4a | 603 | (- (tm:gmtoff (localtime (time-second utc-time))))) |
5bbfe8cb RB |
604 | |
605 | ;; special thing -- ignores nanos | |
abab34ce AW |
606 | (define (time->julian-day-number seconds tz-offset) |
607 | (+ (/ (+ seconds tz-offset sihd) | |
608 | sid) | |
609 | tai-epoch-in-jd)) | |
5bbfe8cb | 610 | |
abab34ce AW |
611 | (define (leap-second? second) |
612 | (and (assoc second leap-second-table) #t)) | |
5bbfe8cb RB |
613 | |
614 | (define (time-utc->date time . tz-offset) | |
615 | (if (not (eq? (time-type time) time-utc)) | |
abab34ce | 616 | (time-error 'time->date 'incompatible-time-types time)) |
4549ba4a | 617 | (let* ((offset (if (null? tz-offset) |
abab34ce | 618 | (local-tz-offset time) |
4549ba4a | 619 | (car tz-offset))) |
abab34ce AW |
620 | (leap-second? (leap-second? (+ offset (time-second time)))) |
621 | (jdn (time->julian-day-number (if leap-second? | |
5bbfe8cb RB |
622 | (- (time-second time) 1) |
623 | (time-second time)) | |
624 | offset))) | |
625 | ||
abab34ce | 626 | (call-with-values (lambda () (decode-julian-day-number jdn)) |
5bbfe8cb | 627 | (lambda (secs date month year) |
4549ba4a MV |
628 | ;; secs is a real because jdn is a real in Guile; |
629 | ;; but it is conceptionally an integer. | |
630 | (let* ((int-secs (inexact->exact (round secs))) | |
5e1fb41f RB |
631 | (hours (quotient int-secs (* 60 60))) |
632 | (rem (remainder int-secs (* 60 60))) | |
5bbfe8cb RB |
633 | (minutes (quotient rem 60)) |
634 | (seconds (remainder rem 60))) | |
635 | (make-date (time-nanosecond time) | |
636 | (if leap-second? (+ seconds 1) seconds) | |
637 | minutes | |
638 | hours | |
639 | date | |
640 | month | |
641 | year | |
642 | offset)))))) | |
643 | ||
644 | (define (time-tai->date time . tz-offset) | |
645 | (if (not (eq? (time-type time) time-tai)) | |
abab34ce | 646 | (time-error 'time->date 'incompatible-time-types time)) |
4549ba4a | 647 | (let* ((offset (if (null? tz-offset) |
abab34ce | 648 | (local-tz-offset (time-tai->time-utc time)) |
4549ba4a | 649 | (car tz-offset))) |
5bbfe8cb | 650 | (seconds (- (time-second time) |
abab34ce AW |
651 | (leap-second-delta (time-second time)))) |
652 | (leap-second? (leap-second? (+ offset seconds))) | |
653 | (jdn (time->julian-day-number (if leap-second? | |
5bbfe8cb RB |
654 | (- seconds 1) |
655 | seconds) | |
656 | offset))) | |
abab34ce | 657 | (call-with-values (lambda () (decode-julian-day-number jdn)) |
5bbfe8cb | 658 | (lambda (secs date month year) |
4549ba4a MV |
659 | ;; secs is a real because jdn is a real in Guile; |
660 | ;; but it is conceptionally an integer. | |
5bbfe8cb | 661 | ;; adjust for leap seconds if necessary ... |
4549ba4a MV |
662 | (let* ((int-secs (inexact->exact (round secs))) |
663 | (hours (quotient int-secs (* 60 60))) | |
664 | (rem (remainder int-secs (* 60 60))) | |
5bbfe8cb RB |
665 | (minutes (quotient rem 60)) |
666 | (seconds (remainder rem 60))) | |
667 | (make-date (time-nanosecond time) | |
668 | (if leap-second? (+ seconds 1) seconds) | |
669 | minutes | |
670 | hours | |
671 | date | |
672 | month | |
673 | year | |
674 | offset)))))) | |
675 | ||
676 | ;; this is the same as time-tai->date. | |
677 | (define (time-monotonic->date time . tz-offset) | |
678 | (if (not (eq? (time-type time) time-monotonic)) | |
abab34ce | 679 | (time-error 'time->date 'incompatible-time-types time)) |
4549ba4a | 680 | (let* ((offset (if (null? tz-offset) |
abab34ce | 681 | (local-tz-offset (time-monotonic->time-utc time)) |
4549ba4a | 682 | (car tz-offset))) |
5bbfe8cb | 683 | (seconds (- (time-second time) |
abab34ce AW |
684 | (leap-second-delta (time-second time)))) |
685 | (leap-second? (leap-second? (+ offset seconds))) | |
686 | (jdn (time->julian-day-number (if leap-second? | |
5bbfe8cb RB |
687 | (- seconds 1) |
688 | seconds) | |
689 | offset))) | |
abab34ce | 690 | (call-with-values (lambda () (decode-julian-day-number jdn)) |
5bbfe8cb | 691 | (lambda (secs date month year) |
4549ba4a MV |
692 | ;; secs is a real because jdn is a real in Guile; |
693 | ;; but it is conceptionally an integer. | |
5bbfe8cb | 694 | ;; adjust for leap seconds if necessary ... |
4549ba4a MV |
695 | (let* ((int-secs (inexact->exact (round secs))) |
696 | (hours (quotient int-secs (* 60 60))) | |
697 | (rem (remainder int-secs (* 60 60))) | |
5bbfe8cb RB |
698 | (minutes (quotient rem 60)) |
699 | (seconds (remainder rem 60))) | |
700 | (make-date (time-nanosecond time) | |
701 | (if leap-second? (+ seconds 1) seconds) | |
702 | minutes | |
703 | hours | |
704 | date | |
705 | month | |
706 | year | |
707 | offset)))))) | |
708 | ||
709 | (define (date->time-utc date) | |
abab34ce | 710 | (let* ((jdays (- (encode-julian-day-number (date-day date) |
5bbfe8cb RB |
711 | (date-month date) |
712 | (date-year date)) | |
abab34ce | 713 | tai-epoch-in-jd)) |
4549ba4a MV |
714 | ;; jdays is an integer plus 1/2, |
715 | (jdays-1/2 (inexact->exact (- jdays 1/2)))) | |
afb47f6d | 716 | (make-time |
5bbfe8cb RB |
717 | time-utc |
718 | (date-nanosecond date) | |
4549ba4a | 719 | (+ (* jdays-1/2 24 60 60) |
5bbfe8cb RB |
720 | (* (date-hour date) 60 60) |
721 | (* (date-minute date) 60) | |
4549ba4a MV |
722 | (date-second date) |
723 | (- (date-zone-offset date)))))) | |
5bbfe8cb RB |
724 | |
725 | (define (date->time-tai date) | |
726 | (time-utc->time-tai! (date->time-utc date))) | |
727 | ||
728 | (define (date->time-monotonic date) | |
729 | (time-utc->time-monotonic! (date->time-utc date))) | |
730 | ||
abab34ce | 731 | (define (leap-year? year) |
5bbfe8cb RB |
732 | (or (= (modulo year 400) 0) |
733 | (and (= (modulo year 4) 0) (not (= (modulo year 100) 0))))) | |
5bbfe8cb | 734 | |
359b471e NJ |
735 | ;; Map 1-based month number M to number of days in the year before the |
736 | ;; start of month M (in a non-leap year). | |
abab34ce | 737 | (define month-assoc '((1 . 0) (2 . 31) (3 . 59) (4 . 90) |
359b471e NJ |
738 | (5 . 120) (6 . 151) (7 . 181) (8 . 212) |
739 | (9 . 243) (10 . 273) (11 . 304) (12 . 334))) | |
5bbfe8cb | 740 | |
abab34ce AW |
741 | (define (year-day day month year) |
742 | (let ((days-pr (assoc month month-assoc))) | |
5bbfe8cb | 743 | (if (not days-pr) |
abab34ce AW |
744 | (time-error 'date-year-day 'invalid-month-specification month)) |
745 | (if (and (leap-year? year) (> month 2)) | |
5bbfe8cb RB |
746 | (+ day (cdr days-pr) 1) |
747 | (+ day (cdr days-pr))))) | |
748 | ||
749 | (define (date-year-day date) | |
abab34ce | 750 | (year-day (date-day date) (date-month date) (date-year date))) |
5bbfe8cb | 751 | |
afb47f6d | 752 | ;; from calendar faq |
abab34ce | 753 | (define (week-day day month year) |
5bbfe8cb RB |
754 | (let* ((a (quotient (- 14 month) 12)) |
755 | (y (- year a)) | |
756 | (m (+ month (* 12 a) -2))) | |
757 | (modulo (+ day | |
758 | y | |
759 | (quotient y 4) | |
760 | (- (quotient y 100)) | |
761 | (quotient y 400) | |
762 | (quotient (* 31 m) 12)) | |
763 | 7))) | |
764 | ||
765 | (define (date-week-day date) | |
abab34ce | 766 | (week-day (date-day date) (date-month date) (date-year date))) |
5bbfe8cb | 767 | |
abab34ce | 768 | (define (days-before-first-week date day-of-week-starting-week) |
5bbfe8cb RB |
769 | (let* ((first-day (make-date 0 0 0 0 |
770 | 1 | |
771 | 1 | |
772 | (date-year date) | |
773 | #f)) | |
774 | (fdweek-day (date-week-day first-day))) | |
775 | (modulo (- day-of-week-starting-week fdweek-day) | |
776 | 7))) | |
777 | ||
f3cc3dab KR |
778 | ;; The "-1" here is a fix for the reference implementation, to make a new |
779 | ;; week start on the given day-of-week-starting-week. date-year-day returns | |
780 | ;; a day starting from 1 for 1st Jan. | |
781 | ;; | |
5bbfe8cb RB |
782 | (define (date-week-number date day-of-week-starting-week) |
783 | (quotient (- (date-year-day date) | |
f3cc3dab | 784 | 1 |
abab34ce | 785 | (days-before-first-week date day-of-week-starting-week)) |
5bbfe8cb RB |
786 | 7)) |
787 | ||
afb47f6d | 788 | (define (current-date . tz-offset) |
4549ba4a MV |
789 | (let ((time (current-time time-utc))) |
790 | (time-utc->date | |
791 | time | |
792 | (if (null? tz-offset) | |
abab34ce | 793 | (local-tz-offset time) |
4549ba4a | 794 | (car tz-offset))))) |
5bbfe8cb RB |
795 | |
796 | ;; given a 'two digit' number, find the year within 50 years +/- | |
abab34ce | 797 | (define (natural-year n) |
5bbfe8cb RB |
798 | (let* ((current-year (date-year (current-date))) |
799 | (current-century (* (quotient current-year 100) 100))) | |
800 | (cond | |
801 | ((>= n 100) n) | |
802 | ((< n 0) n) | |
803 | ((<= (- (+ current-century n) current-year) 50) (+ current-century n)) | |
804 | (else (+ (- current-century 100) n))))) | |
805 | ||
806 | (define (date->julian-day date) | |
807 | (let ((nanosecond (date-nanosecond date)) | |
808 | (second (date-second date)) | |
809 | (minute (date-minute date)) | |
810 | (hour (date-hour date)) | |
811 | (day (date-day date)) | |
812 | (month (date-month date)) | |
0867f7ba LC |
813 | (year (date-year date)) |
814 | (offset (date-zone-offset date))) | |
abab34ce | 815 | (+ (encode-julian-day-number day month year) |
5bbfe8cb | 816 | (- 1/2) |
0867f7ba LC |
817 | (+ (/ (+ (- offset) |
818 | (* hour 60 60) | |
5bbfe8cb RB |
819 | (* minute 60) |
820 | second | |
abab34ce AW |
821 | (/ nanosecond nano)) |
822 | sid))))) | |
5bbfe8cb RB |
823 | |
824 | (define (date->modified-julian-day date) | |
825 | (- (date->julian-day date) | |
826 | 4800001/2)) | |
827 | ||
828 | (define (time-utc->julian-day time) | |
829 | (if (not (eq? (time-type time) time-utc)) | |
abab34ce AW |
830 | (time-error 'time->date 'incompatible-time-types time)) |
831 | (+ (/ (+ (time-second time) (/ (time-nanosecond time) nano)) | |
832 | sid) | |
833 | tai-epoch-in-jd)) | |
5bbfe8cb RB |
834 | |
835 | (define (time-utc->modified-julian-day time) | |
836 | (- (time-utc->julian-day time) | |
837 | 4800001/2)) | |
838 | ||
839 | (define (time-tai->julian-day time) | |
840 | (if (not (eq? (time-type time) time-tai)) | |
abab34ce | 841 | (time-error 'time->date 'incompatible-time-types time)) |
afb47f6d | 842 | (+ (/ (+ (- (time-second time) |
abab34ce AW |
843 | (leap-second-delta (time-second time))) |
844 | (/ (time-nanosecond time) nano)) | |
845 | sid) | |
846 | tai-epoch-in-jd)) | |
5bbfe8cb RB |
847 | |
848 | (define (time-tai->modified-julian-day time) | |
849 | (- (time-tai->julian-day time) | |
850 | 4800001/2)) | |
851 | ||
852 | ;; this is the same as time-tai->julian-day | |
853 | (define (time-monotonic->julian-day time) | |
854 | (if (not (eq? (time-type time) time-monotonic)) | |
abab34ce | 855 | (time-error 'time->date 'incompatible-time-types time)) |
afb47f6d | 856 | (+ (/ (+ (- (time-second time) |
abab34ce AW |
857 | (leap-second-delta (time-second time))) |
858 | (/ (time-nanosecond time) nano)) | |
859 | sid) | |
860 | tai-epoch-in-jd)) | |
5bbfe8cb RB |
861 | |
862 | (define (time-monotonic->modified-julian-day time) | |
863 | (- (time-monotonic->julian-day time) | |
864 | 4800001/2)) | |
865 | ||
866 | (define (julian-day->time-utc jdn) | |
abab34ce | 867 | (let ((secs (* sid (- jdn tai-epoch-in-jd)))) |
5bbfe8cb | 868 | (receive (seconds parts) |
abab34ce | 869 | (split-real secs) |
afb47f6d | 870 | (make-time time-utc |
abab34ce | 871 | (* parts nano) |
4549ba4a | 872 | seconds)))) |
5bbfe8cb RB |
873 | |
874 | (define (julian-day->time-tai jdn) | |
875 | (time-utc->time-tai! (julian-day->time-utc jdn))) | |
876 | ||
877 | (define (julian-day->time-monotonic jdn) | |
878 | (time-utc->time-monotonic! (julian-day->time-utc jdn))) | |
879 | ||
880 | (define (julian-day->date jdn . tz-offset) | |
4549ba4a MV |
881 | (let* ((time (julian-day->time-utc jdn)) |
882 | (offset (if (null? tz-offset) | |
abab34ce | 883 | (local-tz-offset time) |
4549ba4a MV |
884 | (car tz-offset)))) |
885 | (time-utc->date time offset))) | |
5bbfe8cb RB |
886 | |
887 | (define (modified-julian-day->date jdn . tz-offset) | |
4549ba4a MV |
888 | (apply julian-day->date (+ jdn 4800001/2) |
889 | tz-offset)) | |
5bbfe8cb RB |
890 | |
891 | (define (modified-julian-day->time-utc jdn) | |
892 | (julian-day->time-utc (+ jdn 4800001/2))) | |
893 | ||
894 | (define (modified-julian-day->time-tai jdn) | |
895 | (julian-day->time-tai (+ jdn 4800001/2))) | |
896 | ||
897 | (define (modified-julian-day->time-monotonic jdn) | |
898 | (julian-day->time-monotonic (+ jdn 4800001/2))) | |
899 | ||
900 | (define (current-julian-day) | |
901 | (time-utc->julian-day (current-time time-utc))) | |
902 | ||
903 | (define (current-modified-julian-day) | |
904 | (time-utc->modified-julian-day (current-time time-utc))) | |
905 | ||
906 | ;; returns a string rep. of number N, of minimum LENGTH, padded with | |
907 | ;; character PAD-WITH. If PAD-WITH is #f, no padding is done, and it's | |
908 | ;; as if number->string was used. if string is longer than or equal | |
909 | ;; in length to LENGTH, it's as if number->string was used. | |
910 | ||
abab34ce | 911 | (define (padding n pad-with length) |
5bbfe8cb RB |
912 | (let* ((str (number->string n)) |
913 | (str-len (string-length str))) | |
914 | (if (or (>= str-len length) | |
915 | (not pad-with)) | |
916 | str | |
917 | (string-append (make-string (- length str-len) pad-with) str)))) | |
918 | ||
abab34ce | 919 | (define (last-n-digits i n) |
5bbfe8cb RB |
920 | (abs (remainder i (expt 10 n)))) |
921 | ||
abab34ce AW |
922 | (define (locale-abbr-weekday n) (locale-day-short (+ 1 n))) |
923 | (define (locale-long-weekday n) (locale-day (+ 1 n))) | |
924 | (define locale-abbr-month locale-month-short) | |
925 | (define locale-long-month locale-month) | |
a2f00b9b | 926 | |
abab34ce | 927 | (define (date-reverse-lookup needle haystack-ref haystack-len |
a2f00b9b LC |
928 | same?) |
929 | ;; Lookup NEEDLE (a string) using HAYSTACK-REF (a one argument procedure | |
930 | ;; that returns a string corresponding to the given index) by passing it | |
931 | ;; indices lower than HAYSTACK-LEN. | |
932 | (let loop ((index 1)) | |
933 | (cond ((> index haystack-len) #f) | |
934 | ((same? needle (haystack-ref index)) | |
935 | index) | |
936 | (else (loop (+ index 1)))))) | |
5bbfe8cb | 937 | |
abab34ce AW |
938 | (define (locale-abbr-weekday->index string) |
939 | (date-reverse-lookup string locale-day-short 7 string=?)) | |
5bbfe8cb | 940 | |
abab34ce AW |
941 | (define (locale-long-weekday->index string) |
942 | (date-reverse-lookup string locale-day 7 string=?)) | |
5bbfe8cb | 943 | |
abab34ce AW |
944 | (define (locale-abbr-month->index string) |
945 | (date-reverse-lookup string locale-abbr-month 12 string=?)) | |
5bbfe8cb | 946 | |
abab34ce AW |
947 | (define (locale-long-month->index string) |
948 | (date-reverse-lookup string locale-long-month 12 string=?)) | |
5bbfe8cb RB |
949 | |
950 | ||
4549ba4a MV |
951 | ;; FIXME: mkoeppe: Put a symbolic time zone in the date structs. |
952 | ;; Print it here instead of the numerical offset if available. | |
abab34ce AW |
953 | (define (locale-print-time-zone date port) |
954 | (tz-printer (date-zone-offset date) port)) | |
5bbfe8cb | 955 | |
abab34ce AW |
956 | (define (locale-am-string/pm hr) |
957 | (if (> hr 11) (locale-pm-string) (locale-am-string))) | |
5bbfe8cb | 958 | |
abab34ce | 959 | (define (tz-printer offset port) |
5bbfe8cb RB |
960 | (cond |
961 | ((= offset 0) (display "Z" port)) | |
962 | ((negative? offset) (display "-" port)) | |
963 | (else (display "+" port))) | |
964 | (if (not (= offset 0)) | |
965 | (let ((hours (abs (quotient offset (* 60 60)))) | |
966 | (minutes (abs (quotient (remainder offset (* 60 60)) 60)))) | |
abab34ce AW |
967 | (display (padding hours #\0 2) port) |
968 | (display (padding minutes #\0 2) port)))) | |
5bbfe8cb | 969 | |
5bbfe8cb RB |
970 | ;; A table of output formatting directives. |
971 | ;; the first time is the format char. | |
972 | ;; the second is a procedure that takes the date, a padding character | |
973 | ;; (which might be #f), and the output port. | |
974 | ;; | |
abab34ce | 975 | (define directives |
5bbfe8cb RB |
976 | (list |
977 | (cons #\~ (lambda (date pad-with port) | |
978 | (display #\~ port))) | |
979 | (cons #\a (lambda (date pad-with port) | |
abab34ce | 980 | (display (locale-abbr-weekday (date-week-day date)) |
5bbfe8cb RB |
981 | port))) |
982 | (cons #\A (lambda (date pad-with port) | |
abab34ce | 983 | (display (locale-long-weekday (date-week-day date)) |
5bbfe8cb RB |
984 | port))) |
985 | (cons #\b (lambda (date pad-with port) | |
abab34ce | 986 | (display (locale-abbr-month (date-month date)) |
5bbfe8cb RB |
987 | port))) |
988 | (cons #\B (lambda (date pad-with port) | |
abab34ce | 989 | (display (locale-long-month (date-month date)) |
5bbfe8cb RB |
990 | port))) |
991 | (cons #\c (lambda (date pad-with port) | |
abab34ce | 992 | (display (date->string date locale-date-time-format) port))) |
5bbfe8cb | 993 | (cons #\d (lambda (date pad-with port) |
abab34ce | 994 | (display (padding (date-day date) |
5bbfe8cb RB |
995 | #\0 2) |
996 | port))) | |
997 | (cons #\D (lambda (date pad-with port) | |
998 | (display (date->string date "~m/~d/~y") port))) | |
999 | (cons #\e (lambda (date pad-with port) | |
abab34ce | 1000 | (display (padding (date-day date) |
5bbfe8cb RB |
1001 | #\Space 2) |
1002 | port))) | |
1003 | (cons #\f (lambda (date pad-with port) | |
1004 | (if (> (date-nanosecond date) | |
abab34ce AW |
1005 | nano) |
1006 | (display (padding (+ (date-second date) 1) | |
5bbfe8cb RB |
1007 | pad-with 2) |
1008 | port) | |
abab34ce | 1009 | (display (padding (date-second date) |
5bbfe8cb RB |
1010 | pad-with 2) |
1011 | port)) | |
afb47f6d | 1012 | (receive (i f) |
abab34ce | 1013 | (split-real (/ |
5bbfe8cb | 1014 | (date-nanosecond date) |
abab34ce | 1015 | nano 1.0)) |
5bbfe8cb RB |
1016 | (let* ((ns (number->string f)) |
1017 | (le (string-length ns))) | |
1018 | (if (> le 2) | |
1019 | (begin | |
abab34ce | 1020 | (display (locale-decimal-point) port) |
5bbfe8cb RB |
1021 | (display (substring ns 2 le) port))))))) |
1022 | (cons #\h (lambda (date pad-with port) | |
1023 | (display (date->string date "~b") port))) | |
1024 | (cons #\H (lambda (date pad-with port) | |
abab34ce | 1025 | (display (padding (date-hour date) |
5bbfe8cb RB |
1026 | pad-with 2) |
1027 | port))) | |
1028 | (cons #\I (lambda (date pad-with port) | |
1029 | (let ((hr (date-hour date))) | |
1030 | (if (> hr 12) | |
abab34ce | 1031 | (display (padding (- hr 12) |
5bbfe8cb RB |
1032 | pad-with 2) |
1033 | port) | |
abab34ce | 1034 | (display (padding hr |
5bbfe8cb RB |
1035 | pad-with 2) |
1036 | port))))) | |
1037 | (cons #\j (lambda (date pad-with port) | |
abab34ce | 1038 | (display (padding (date-year-day date) |
5bbfe8cb RB |
1039 | pad-with 3) |
1040 | port))) | |
1041 | (cons #\k (lambda (date pad-with port) | |
abab34ce | 1042 | (display (padding (date-hour date) |
5bbfe8cb RB |
1043 | #\Space 2) |
1044 | port))) | |
1045 | (cons #\l (lambda (date pad-with port) | |
1046 | (let ((hr (if (> (date-hour date) 12) | |
1047 | (- (date-hour date) 12) (date-hour date)))) | |
abab34ce | 1048 | (display (padding hr #\Space 2) |
5bbfe8cb RB |
1049 | port)))) |
1050 | (cons #\m (lambda (date pad-with port) | |
abab34ce | 1051 | (display (padding (date-month date) |
5bbfe8cb RB |
1052 | pad-with 2) |
1053 | port))) | |
1054 | (cons #\M (lambda (date pad-with port) | |
abab34ce | 1055 | (display (padding (date-minute date) |
5bbfe8cb RB |
1056 | pad-with 2) |
1057 | port))) | |
1058 | (cons #\n (lambda (date pad-with port) | |
1059 | (newline port))) | |
1060 | (cons #\N (lambda (date pad-with port) | |
abab34ce | 1061 | (display (padding (date-nanosecond date) |
5bbfe8cb RB |
1062 | pad-with 7) |
1063 | port))) | |
1064 | (cons #\p (lambda (date pad-with port) | |
abab34ce | 1065 | (display (locale-am-string/pm (date-hour date)) port))) |
5bbfe8cb RB |
1066 | (cons #\r (lambda (date pad-with port) |
1067 | (display (date->string date "~I:~M:~S ~p") port))) | |
1068 | (cons #\s (lambda (date pad-with port) | |
1069 | (display (time-second (date->time-utc date)) port))) | |
1070 | (cons #\S (lambda (date pad-with port) | |
1071 | (if (> (date-nanosecond date) | |
abab34ce AW |
1072 | nano) |
1073 | (display (padding (+ (date-second date) 1) | |
5bbfe8cb RB |
1074 | pad-with 2) |
1075 | port) | |
abab34ce | 1076 | (display (padding (date-second date) |
5bbfe8cb RB |
1077 | pad-with 2) |
1078 | port)))) | |
1079 | (cons #\t (lambda (date pad-with port) | |
1080 | (display #\Tab port))) | |
1081 | (cons #\T (lambda (date pad-with port) | |
1082 | (display (date->string date "~H:~M:~S") port))) | |
1083 | (cons #\U (lambda (date pad-with port) | |
abab34ce AW |
1084 | (if (> (days-before-first-week date 0) 0) |
1085 | (display (padding (+ (date-week-number date 0) 1) | |
5bbfe8cb | 1086 | #\0 2) port) |
abab34ce | 1087 | (display (padding (date-week-number date 0) |
5bbfe8cb RB |
1088 | #\0 2) port)))) |
1089 | (cons #\V (lambda (date pad-with port) | |
abab34ce | 1090 | (display (padding (date-week-number date 1) |
5bbfe8cb RB |
1091 | #\0 2) port))) |
1092 | (cons #\w (lambda (date pad-with port) | |
1093 | (display (date-week-day date) port))) | |
1094 | (cons #\x (lambda (date pad-with port) | |
abab34ce | 1095 | (display (date->string date locale-short-date-format) port))) |
5bbfe8cb | 1096 | (cons #\X (lambda (date pad-with port) |
abab34ce | 1097 | (display (date->string date locale-time-format) port))) |
5bbfe8cb | 1098 | (cons #\W (lambda (date pad-with port) |
abab34ce AW |
1099 | (if (> (days-before-first-week date 1) 0) |
1100 | (display (padding (+ (date-week-number date 1) 1) | |
5bbfe8cb | 1101 | #\0 2) port) |
abab34ce | 1102 | (display (padding (date-week-number date 1) |
5bbfe8cb RB |
1103 | #\0 2) port)))) |
1104 | (cons #\y (lambda (date pad-with port) | |
abab34ce | 1105 | (display (padding (last-n-digits |
5bbfe8cb RB |
1106 | (date-year date) 2) |
1107 | pad-with | |
1108 | 2) | |
1109 | port))) | |
1110 | (cons #\Y (lambda (date pad-with port) | |
1111 | (display (date-year date) port))) | |
1112 | (cons #\z (lambda (date pad-with port) | |
abab34ce | 1113 | (tz-printer (date-zone-offset date) port))) |
5bbfe8cb | 1114 | (cons #\Z (lambda (date pad-with port) |
abab34ce | 1115 | (locale-print-time-zone date port))) |
5bbfe8cb RB |
1116 | (cons #\1 (lambda (date pad-with port) |
1117 | (display (date->string date "~Y-~m-~d") port))) | |
1118 | (cons #\2 (lambda (date pad-with port) | |
d6bd1826 | 1119 | (display (date->string date "~H:~M:~S~z") port))) |
5bbfe8cb | 1120 | (cons #\3 (lambda (date pad-with port) |
d6bd1826 | 1121 | (display (date->string date "~H:~M:~S") port))) |
5bbfe8cb | 1122 | (cons #\4 (lambda (date pad-with port) |
d6bd1826 | 1123 | (display (date->string date "~Y-~m-~dT~H:~M:~S~z") port))) |
5bbfe8cb | 1124 | (cons #\5 (lambda (date pad-with port) |
d6bd1826 | 1125 | (display (date->string date "~Y-~m-~dT~H:~M:~S") port))))) |
5bbfe8cb RB |
1126 | |
1127 | ||
abab34ce AW |
1128 | (define (get-formatter char) |
1129 | (let ((associated (assoc char directives))) | |
5bbfe8cb RB |
1130 | (if associated (cdr associated) #f))) |
1131 | ||
abab34ce | 1132 | (define (date-printer date index format-string str-len port) |
0a283d1b | 1133 | (if (< index str-len) |
5bbfe8cb RB |
1134 | (let ((current-char (string-ref format-string index))) |
1135 | (if (not (char=? current-char #\~)) | |
1136 | (begin | |
1137 | (display current-char port) | |
abab34ce | 1138 | (date-printer date (+ index 1) format-string str-len port)) |
5bbfe8cb | 1139 | (if (= (+ index 1) str-len) ; bad format string. |
abab34ce | 1140 | (time-error 'date-printer 'bad-date-format-string |
5bbfe8cb RB |
1141 | format-string) |
1142 | (let ((pad-char? (string-ref format-string (+ index 1)))) | |
1143 | (cond | |
1144 | ((char=? pad-char? #\-) | |
1145 | (if (= (+ index 2) str-len) ; bad format string. | |
abab34ce | 1146 | (time-error 'date-printer |
afb47f6d | 1147 | 'bad-date-format-string |
5bbfe8cb | 1148 | format-string) |
abab34ce | 1149 | (let ((formatter (get-formatter |
5bbfe8cb RB |
1150 | (string-ref format-string |
1151 | (+ index 2))))) | |
1152 | (if (not formatter) | |
abab34ce | 1153 | (time-error 'date-printer |
afb47f6d | 1154 | 'bad-date-format-string |
5bbfe8cb RB |
1155 | format-string) |
1156 | (begin | |
1157 | (formatter date #f port) | |
abab34ce | 1158 | (date-printer date |
5bbfe8cb RB |
1159 | (+ index 3) |
1160 | format-string | |
1161 | str-len | |
1162 | port)))))) | |
afb47f6d | 1163 | |
5bbfe8cb RB |
1164 | ((char=? pad-char? #\_) |
1165 | (if (= (+ index 2) str-len) ; bad format string. | |
abab34ce | 1166 | (time-error 'date-printer |
afb47f6d | 1167 | 'bad-date-format-string |
5bbfe8cb | 1168 | format-string) |
abab34ce | 1169 | (let ((formatter (get-formatter |
5bbfe8cb RB |
1170 | (string-ref format-string |
1171 | (+ index 2))))) | |
1172 | (if (not formatter) | |
abab34ce | 1173 | (time-error 'date-printer |
afb47f6d | 1174 | 'bad-date-format-string |
5bbfe8cb RB |
1175 | format-string) |
1176 | (begin | |
1177 | (formatter date #\Space port) | |
abab34ce | 1178 | (date-printer date |
5bbfe8cb RB |
1179 | (+ index 3) |
1180 | format-string | |
1181 | str-len | |
1182 | port)))))) | |
1183 | (else | |
abab34ce | 1184 | (let ((formatter (get-formatter |
5bbfe8cb RB |
1185 | (string-ref format-string |
1186 | (+ index 1))))) | |
1187 | (if (not formatter) | |
abab34ce | 1188 | (time-error 'date-printer |
afb47f6d | 1189 | 'bad-date-format-string |
5bbfe8cb RB |
1190 | format-string) |
1191 | (begin | |
1192 | (formatter date #\0 port) | |
abab34ce | 1193 | (date-printer date |
5bbfe8cb RB |
1194 | (+ index 2) |
1195 | format-string | |
1196 | str-len | |
1197 | port)))))))))))) | |
1198 | ||
1199 | ||
1200 | (define (date->string date . format-string) | |
1201 | (let ((str-port (open-output-string)) | |
5e1fb41f | 1202 | (fmt-str (if (null? format-string) "~c" (car format-string)))) |
abab34ce | 1203 | (date-printer date 0 fmt-str (string-length fmt-str) str-port) |
5bbfe8cb RB |
1204 | (get-output-string str-port))) |
1205 | ||
abab34ce | 1206 | (define (char->int ch) |
5bbfe8cb RB |
1207 | (case ch |
1208 | ((#\0) 0) | |
1209 | ((#\1) 1) | |
1210 | ((#\2) 2) | |
1211 | ((#\3) 3) | |
1212 | ((#\4) 4) | |
1213 | ((#\5) 5) | |
1214 | ((#\6) 6) | |
1215 | ((#\7) 7) | |
1216 | ((#\8) 8) | |
1217 | ((#\9) 9) | |
abab34ce | 1218 | (else (time-error 'char->int 'bad-date-template-string |
84012ef4 | 1219 | (list "Non-integer character" ch))))) |
5bbfe8cb RB |
1220 | |
1221 | ;; read an integer upto n characters long on port; upto -> #f is any length | |
abab34ce | 1222 | (define (integer-reader upto port) |
5bbfe8cb RB |
1223 | (let loop ((accum 0) (nchars 0)) |
1224 | (let ((ch (peek-char port))) | |
1225 | (if (or (eof-object? ch) | |
1226 | (not (char-numeric? ch)) | |
1227 | (and upto (>= nchars upto))) | |
1228 | accum | |
abab34ce | 1229 | (loop (+ (* accum 10) (char->int (read-char port))) |
5bbfe8cb RB |
1230 | (+ nchars 1)))))) |
1231 | ||
abab34ce | 1232 | (define (make-integer-reader upto) |
5bbfe8cb | 1233 | (lambda (port) |
abab34ce | 1234 | (integer-reader upto port))) |
5bbfe8cb RB |
1235 | |
1236 | ;; read *exactly* n characters and convert to integer; could be padded | |
abab34ce | 1237 | (define (integer-reader-exact n port) |
5bbfe8cb RB |
1238 | (let ((padding-ok #t)) |
1239 | (define (accum-int port accum nchars) | |
1240 | (let ((ch (peek-char port))) | |
5a1920de RB |
1241 | (cond |
1242 | ((>= nchars n) accum) | |
afb47f6d | 1243 | ((eof-object? ch) |
abab34ce | 1244 | (time-error 'string->date 'bad-date-template-string |
5bbfe8cb | 1245 | "Premature ending to integer read.")) |
5a1920de RB |
1246 | ((char-numeric? ch) |
1247 | (set! padding-ok #f) | |
1248 | (accum-int port | |
abab34ce | 1249 | (+ (* accum 10) (char->int (read-char port))) |
5a1920de RB |
1250 | (+ nchars 1))) |
1251 | (padding-ok | |
1252 | (read-char port) ; consume padding | |
1253 | (accum-int port accum (+ nchars 1))) | |
1254 | (else ; padding where it shouldn't be | |
abab34ce | 1255 | (time-error 'string->date 'bad-date-template-string |
5bbfe8cb RB |
1256 | "Non-numeric characters in integer read."))))) |
1257 | (accum-int port 0 0))) | |
1258 | ||
1259 | ||
abab34ce | 1260 | (define (make-integer-exact-reader n) |
5bbfe8cb | 1261 | (lambda (port) |
abab34ce | 1262 | (integer-reader-exact n port))) |
5bbfe8cb | 1263 | |
abab34ce | 1264 | (define (zone-reader port) |
afb47f6d | 1265 | (let ((offset 0) |
5bbfe8cb RB |
1266 | (positive? #f)) |
1267 | (let ((ch (read-char port))) | |
1268 | (if (eof-object? ch) | |
abab34ce | 1269 | (time-error 'string->date 'bad-date-template-string |
5bbfe8cb RB |
1270 | (list "Invalid time zone +/-" ch))) |
1271 | (if (or (char=? ch #\Z) (char=? ch #\z)) | |
1272 | 0 | |
1273 | (begin | |
1274 | (cond | |
1275 | ((char=? ch #\+) (set! positive? #t)) | |
1276 | ((char=? ch #\-) (set! positive? #f)) | |
1277 | (else | |
abab34ce | 1278 | (time-error 'string->date 'bad-date-template-string |
5bbfe8cb RB |
1279 | (list "Invalid time zone +/-" ch)))) |
1280 | (let ((ch (read-char port))) | |
1281 | (if (eof-object? ch) | |
abab34ce | 1282 | (time-error 'string->date 'bad-date-template-string |
5bbfe8cb | 1283 | (list "Invalid time zone number" ch))) |
abab34ce | 1284 | (set! offset (* (char->int ch) |
5bbfe8cb RB |
1285 | 10 60 60))) |
1286 | (let ((ch (read-char port))) | |
1287 | (if (eof-object? ch) | |
abab34ce | 1288 | (time-error 'string->date 'bad-date-template-string |
5bbfe8cb | 1289 | (list "Invalid time zone number" ch))) |
abab34ce | 1290 | (set! offset (+ offset (* (char->int ch) |
5bbfe8cb RB |
1291 | 60 60)))) |
1292 | (let ((ch (read-char port))) | |
1293 | (if (eof-object? ch) | |
abab34ce | 1294 | (time-error 'string->date 'bad-date-template-string |
5bbfe8cb | 1295 | (list "Invalid time zone number" ch))) |
abab34ce | 1296 | (set! offset (+ offset (* (char->int ch) |
5bbfe8cb RB |
1297 | 10 60)))) |
1298 | (let ((ch (read-char port))) | |
1299 | (if (eof-object? ch) | |
abab34ce | 1300 | (time-error 'string->date 'bad-date-template-string |
5bbfe8cb | 1301 | (list "Invalid time zone number" ch))) |
abab34ce | 1302 | (set! offset (+ offset (* (char->int ch) |
5bbfe8cb RB |
1303 | 60)))) |
1304 | (if positive? offset (- offset))))))) | |
1305 | ||
1306 | ;; looking at a char, read the char string, run thru indexer, return index | |
abab34ce | 1307 | (define (locale-reader port indexer) |
b4d2a48e RB |
1308 | |
1309 | (define (read-char-string result) | |
1310 | (let ((ch (peek-char port))) | |
1311 | (if (char-alphabetic? ch) | |
1312 | (read-char-string (cons (read-char port) result)) | |
1313 | (list->string (reverse! result))))) | |
afb47f6d TTN |
1314 | |
1315 | (let* ((str (read-char-string '())) | |
b4d2a48e | 1316 | (index (indexer str))) |
abab34ce | 1317 | (if index index (time-error 'string->date |
b4d2a48e RB |
1318 | 'bad-date-template-string |
1319 | (list "Invalid string for " indexer))))) | |
5bbfe8cb | 1320 | |
abab34ce | 1321 | (define (make-locale-reader indexer) |
5bbfe8cb | 1322 | (lambda (port) |
abab34ce | 1323 | (locale-reader port indexer))) |
5bbfe8cb | 1324 | |
abab34ce | 1325 | (define (make-char-id-reader char) |
5bbfe8cb RB |
1326 | (lambda (port) |
1327 | (if (char=? char (read-char port)) | |
1328 | char | |
abab34ce | 1329 | (time-error 'string->date |
5bbfe8cb RB |
1330 | 'bad-date-template-string |
1331 | "Invalid character match.")))) | |
1332 | ||
1333 | ;; A List of formatted read directives. | |
1334 | ;; Each entry is a list. | |
afb47f6d | 1335 | ;; 1. the character directive; |
5bbfe8cb RB |
1336 | ;; a procedure, which takes a character as input & returns |
1337 | ;; 2. #t as soon as a character on the input port is acceptable | |
1338 | ;; for input, | |
1339 | ;; 3. a port reader procedure that knows how to read the current port | |
1340 | ;; for a value. Its one parameter is the port. | |
0a283d1b AW |
1341 | ;; 4. an optional action procedure, that takes the value (from 3.) and |
1342 | ;; some object (here, always the date) and (probably) side-effects it. | |
1343 | ;; If no action is required, as with ~A, this element may be #f. | |
5bbfe8cb | 1344 | |
abab34ce AW |
1345 | (define read-directives |
1346 | (let ((ireader4 (make-integer-reader 4)) | |
1347 | (ireader2 (make-integer-reader 2)) | |
1348 | (eireader2 (make-integer-exact-reader 2)) | |
1349 | (locale-reader-abbr-weekday (make-locale-reader | |
1350 | locale-abbr-weekday->index)) | |
1351 | (locale-reader-long-weekday (make-locale-reader | |
1352 | locale-long-weekday->index)) | |
1353 | (locale-reader-abbr-month (make-locale-reader | |
1354 | locale-abbr-month->index)) | |
1355 | (locale-reader-long-month (make-locale-reader | |
1356 | locale-long-month->index)) | |
0a283d1b | 1357 | (char-fail (lambda (ch) #t))) |
afb47f6d | 1358 | |
5bbfe8cb | 1359 | (list |
abab34ce | 1360 | (list #\~ char-fail (make-char-id-reader #\~) #f) |
0a283d1b AW |
1361 | (list #\a char-alphabetic? locale-reader-abbr-weekday #f) |
1362 | (list #\A char-alphabetic? locale-reader-long-weekday #f) | |
5bbfe8cb RB |
1363 | (list #\b char-alphabetic? locale-reader-abbr-month |
1364 | (lambda (val object) | |
4549ba4a | 1365 | (set-date-month! object val))) |
5bbfe8cb RB |
1366 | (list #\B char-alphabetic? locale-reader-long-month |
1367 | (lambda (val object) | |
4549ba4a | 1368 | (set-date-month! object val))) |
5bbfe8cb | 1369 | (list #\d char-numeric? ireader2 (lambda (val object) |
4549ba4a | 1370 | (set-date-day! |
5bbfe8cb RB |
1371 | object val))) |
1372 | (list #\e char-fail eireader2 (lambda (val object) | |
4549ba4a | 1373 | (set-date-day! object val))) |
5bbfe8cb RB |
1374 | (list #\h char-alphabetic? locale-reader-abbr-month |
1375 | (lambda (val object) | |
4549ba4a | 1376 | (set-date-month! object val))) |
5bbfe8cb | 1377 | (list #\H char-numeric? ireader2 (lambda (val object) |
4549ba4a | 1378 | (set-date-hour! object val))) |
5bbfe8cb | 1379 | (list #\k char-fail eireader2 (lambda (val object) |
4549ba4a | 1380 | (set-date-hour! object val))) |
5bbfe8cb | 1381 | (list #\m char-numeric? ireader2 (lambda (val object) |
4549ba4a | 1382 | (set-date-month! object val))) |
5bbfe8cb | 1383 | (list #\M char-numeric? ireader2 (lambda (val object) |
4549ba4a | 1384 | (set-date-minute! |
5bbfe8cb RB |
1385 | object val))) |
1386 | (list #\S char-numeric? ireader2 (lambda (val object) | |
4549ba4a | 1387 | (set-date-second! object val))) |
afb47f6d | 1388 | (list #\y char-fail eireader2 |
5bbfe8cb | 1389 | (lambda (val object) |
abab34ce | 1390 | (set-date-year! object (natural-year val)))) |
5bbfe8cb | 1391 | (list #\Y char-numeric? ireader4 (lambda (val object) |
4549ba4a | 1392 | (set-date-year! object val))) |
5bbfe8cb RB |
1393 | (list #\z (lambda (c) |
1394 | (or (char=? c #\Z) | |
1395 | (char=? c #\z) | |
1396 | (char=? c #\+) | |
1397 | (char=? c #\-))) | |
abab34ce | 1398 | zone-reader (lambda (val object) |
4549ba4a | 1399 | (set-date-zone-offset! object val)))))) |
5bbfe8cb RB |
1400 | |
1401 | (define (priv:string->date date index format-string str-len port template-string) | |
1402 | (define (skip-until port skipper) | |
1403 | (let ((ch (peek-char port))) | |
39321905 | 1404 | (if (eof-object? ch) |
abab34ce | 1405 | (time-error 'string->date 'bad-date-format-string template-string) |
5bbfe8cb RB |
1406 | (if (not (skipper ch)) |
1407 | (begin (read-char port) (skip-until port skipper)))))) | |
0a283d1b | 1408 | (if (< index str-len) |
5bbfe8cb RB |
1409 | (let ((current-char (string-ref format-string index))) |
1410 | (if (not (char=? current-char #\~)) | |
1411 | (let ((port-char (read-char port))) | |
1412 | (if (or (eof-object? port-char) | |
1413 | (not (char=? current-char port-char))) | |
abab34ce | 1414 | (time-error 'string->date |
5bbfe8cb RB |
1415 | 'bad-date-format-string template-string)) |
1416 | (priv:string->date date | |
1417 | (+ index 1) | |
1418 | format-string | |
1419 | str-len | |
1420 | port | |
1421 | template-string)) | |
1422 | ;; otherwise, it's an escape, we hope | |
1423 | (if (> (+ index 1) str-len) | |
abab34ce | 1424 | (time-error 'string->date |
5bbfe8cb RB |
1425 | 'bad-date-format-string template-string) |
1426 | (let* ((format-char (string-ref format-string (+ index 1))) | |
abab34ce | 1427 | (format-info (assoc format-char read-directives))) |
5bbfe8cb | 1428 | (if (not format-info) |
abab34ce | 1429 | (time-error 'string->date |
5bbfe8cb RB |
1430 | 'bad-date-format-string template-string) |
1431 | (begin | |
1432 | (let ((skipper (cadr format-info)) | |
1433 | (reader (caddr format-info)) | |
1434 | (actor (cadddr format-info))) | |
1435 | (skip-until port skipper) | |
1436 | (let ((val (reader port))) | |
1437 | (if (eof-object? val) | |
abab34ce | 1438 | (time-error 'string->date |
5bbfe8cb RB |
1439 | 'bad-date-format-string |
1440 | template-string) | |
0a283d1b | 1441 | (if actor (actor val date)))) |
5bbfe8cb RB |
1442 | (priv:string->date date |
1443 | (+ index 2) | |
afb47f6d | 1444 | format-string |
5bbfe8cb RB |
1445 | str-len |
1446 | port | |
1447 | template-string)))))))))) | |
1448 | ||
1449 | (define (string->date input-string template-string) | |
abab34ce | 1450 | (define (date-ok? date) |
5bbfe8cb RB |
1451 | (and (date-nanosecond date) |
1452 | (date-second date) | |
1453 | (date-minute date) | |
1454 | (date-hour date) | |
1455 | (date-day date) | |
1456 | (date-month date) | |
1457 | (date-year date) | |
1458 | (date-zone-offset date))) | |
4549ba4a | 1459 | (let ((newdate (make-date 0 0 0 0 #f #f #f #f))) |
5bbfe8cb RB |
1460 | (priv:string->date newdate |
1461 | 0 | |
1462 | template-string | |
1463 | (string-length template-string) | |
1464 | (open-input-string input-string) | |
1465 | template-string) | |
4549ba4a MV |
1466 | (if (not (date-zone-offset newdate)) |
1467 | (begin | |
1468 | ;; this is necessary to get DST right -- as far as we can | |
1469 | ;; get it right (think of the double/missing hour in the | |
1470 | ;; night when we are switching between normal time and DST). | |
1471 | (set-date-zone-offset! newdate | |
abab34ce | 1472 | (local-tz-offset |
4549ba4a MV |
1473 | (make-time time-utc 0 0))) |
1474 | (set-date-zone-offset! newdate | |
abab34ce | 1475 | (local-tz-offset |
4549ba4a | 1476 | (date->time-utc newdate))))) |
abab34ce | 1477 | (if (date-ok? newdate) |
5bbfe8cb | 1478 | newdate |
abab34ce | 1479 | (time-error |
5bbfe8cb RB |
1480 | 'string->date |
1481 | 'bad-date-format-string | |
1482 | (list "Incomplete date read. " newdate template-string))))) | |
afb47f6d TTN |
1483 | |
1484 | ;;; srfi-19.scm ends here |