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1 | ;;; srfi-19.scm --- SRFI-19 procedures for Guile |
2 | ;;; | |
3 | ;;; Copyright (C) 2001 Free Software Foundation, Inc. | |
4 | ;;; | |
5 | ;;; This program is free software; you can redistribute it and/or | |
6 | ;;; modify it under the terms of the GNU General Public License as | |
7 | ;;; published by the Free Software Foundation; either version 2, or | |
8 | ;;; (at your option) any later version. | |
9 | ;;; | |
10 | ;;; This program is distributed in the hope that it will be useful, | |
11 | ;;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | ;;; General Public License for more details. | |
14 | ;;; | |
15 | ;;; You should have received a copy of the GNU General Public License | |
16 | ;;; along with this software; see the file COPYING. If not, write to | |
17 | ;;; the Free Software Foundation, Inc., 59 Temple Place, Suite 330, | |
18 | ;;; Boston, MA 02111-1307 USA | |
19 | ;;; | |
20 | ;;; Originally from SRFI reference implementation by Will Fitzgerald. | |
21 | ;;; Ported to Guile by Rob Browning <rlb@cs.utexas.edu> | |
22 | ||
23 | ;; FIXME: I haven't checked a decent amount of this code for potential | |
24 | ;; performance improvements, but I suspect that there may be some | |
25 | ;; substantial ones to be realized, esp. in the later "parsing" half | |
26 | ;; of the file, by rewriting the code with use of more Guile native | |
27 | ;; functions that do more work in a "chunk". | |
28 | ||
29 | (define-module (srfi srfi-19) | |
30 | :use-module (ice-9 syncase) | |
31 | :use-module (srfi srfi-6) | |
32 | :use-module (srfi srfi-8) | |
33 | :use-module (srfi srfi-9) | |
34 | :export (;; Constants | |
35 | time-duration | |
36 | time-monotonic | |
37 | time-process | |
38 | time-tai | |
39 | time-thread | |
40 | time-utc | |
41 | ;; Current time and clock resolution | |
42 | current-date | |
43 | current-julian-day | |
44 | current-modified-julian-day | |
45 | current-time | |
46 | time-resolution | |
47 | ;; Time object and accessors | |
48 | make-time | |
49 | time? | |
50 | time-type | |
51 | time-nanosecond | |
52 | time-second | |
53 | set-time-type! | |
54 | set-time-nanosecond! | |
55 | set-time-second! | |
56 | copy-time | |
57 | ;; Time comparison procedures | |
58 | time<=? | |
59 | time<? | |
60 | time=? | |
61 | time>=? | |
62 | time>? | |
63 | ;; Time arithmetic procedures | |
64 | time-difference | |
65 | time-difference! | |
66 | add-duration | |
67 | add-duration! | |
68 | subtract-duration | |
69 | subtract-duration! | |
70 | ;; Date object and accessors | |
71 | make-date | |
72 | date? | |
73 | date-nanosecond | |
74 | date-second | |
75 | date-minute | |
76 | date-hour | |
77 | date-day | |
78 | date-month | |
79 | date-year | |
80 | date-zone-offset? | |
81 | date-year-day | |
82 | date-week-day | |
83 | date-week-number | |
84 | ;; Time/Date/Julian Day/Modified Julian Day converters | |
85 | date->julian-day | |
86 | date->modified-julian-day | |
87 | date->time-monotonic | |
88 | date->time-tai | |
89 | date->time-utc | |
90 | julian-day->date | |
91 | julian-day->time-monotonic | |
92 | julian-day->time-tai | |
93 | julian-day->time-utc | |
94 | modified-julian-day->date | |
95 | modified-julian-day->time-monotonic | |
96 | modified-julian-day->time-tai | |
97 | modified-julian-day->time-utc | |
98 | time-monotonic->date | |
99 | time-monotonic->time-monotonic | |
100 | time-monotonic->time-tai | |
101 | time-monotonic->time-tai! | |
102 | time-monotonic->time-utc | |
103 | time-monotonic->time-utc! | |
104 | time-tai->date | |
105 | time-tai->julian-day | |
106 | time-tai->modified-julian-day | |
107 | time-tai->time-monotonic | |
108 | time-tai->time-monotonic! | |
109 | time-tai->time-utc | |
110 | time-tai->time-utc! | |
111 | time-utc->date | |
112 | time-utc->julian-day | |
113 | time-utc->modified-julian-day | |
114 | time-utc->time-monotonic | |
115 | time-utc->time-monotonic! | |
116 | time-utc->time-tai | |
117 | time-utc->time-tai! | |
118 | ;; Date to string/string to date converters. | |
119 | date->string | |
120 | string->date)) | |
121 | ||
122 | ;; :OPTIONAL is nice | |
123 | ||
124 | (define-syntax :optional | |
125 | (syntax-rules () | |
126 | ((_ val default-value) | |
127 | (if (null? val) default-value (car val))))) | |
128 | ||
129 | (define time-tai 'time-tai) | |
130 | (define time-utc 'time-utc) | |
131 | (define time-monotonic 'time-monotonic) | |
132 | (define time-thread 'time-thread) | |
133 | (define time-process 'time-process) | |
134 | (define time-duration 'time-duration) | |
135 | ||
136 | ;; FIXME: do we want to add gc time? | |
137 | ;; (define time-gc 'time-gc) | |
138 | ||
139 | ;;-- LOCALE dependent constants | |
140 | ||
141 | (define priv:locale-number-separator ".") | |
142 | ||
143 | (define priv:locale-abbr-weekday-vector | |
144 | (vector "Sun" "Mon" "Tue" "Wed" "Thu" "Fri" "Sat")) | |
145 | ||
146 | (define priv:locale-long-weekday-vector | |
147 | (vector | |
148 | "Sunday" "Monday" "Tuesday" "Wednesday" "Thursday" "Friday" "Saturday")) | |
149 | ||
150 | ;; note empty string in 0th place. | |
151 | (define priv:locale-abbr-month-vector | |
152 | (vector "" | |
153 | "Jan" | |
154 | "Feb" | |
155 | "Mar" | |
156 | "Apr" | |
157 | "May" | |
158 | "Jun" | |
159 | "Jul" | |
160 | "Aug" | |
161 | "Sep" | |
162 | "Oct" | |
163 | "Nov" | |
164 | "Dec")) | |
165 | ||
166 | (define priv:locale-long-month-vector | |
167 | (vector "" | |
168 | "January" | |
169 | "February" | |
170 | "March" | |
171 | "April" | |
172 | "May" | |
173 | "June" | |
174 | "July" | |
175 | "August" | |
176 | "September" | |
177 | "October" | |
178 | "November" | |
179 | "December")) | |
180 | ||
181 | (define priv:locale-pm "PM") | |
182 | (define priv:locale-am "AM") | |
183 | ||
184 | ;; See date->string | |
185 | (define priv:locale-date-time-format "~a ~b ~d ~H:~M:~S~z ~Y") | |
186 | (define priv:locale-short-date-format "~m/~d/~y") | |
187 | (define priv:locale-time-format "~H:~M:~S") | |
188 | (define priv:iso-8601-date-time-format "~Y-~m-~dT~H:~M:~S~z") | |
189 | ||
190 | ;;-- Miscellaneous Constants. | |
191 | ;;-- only the priv:tai-epoch-in-jd might need changing if | |
192 | ;; a different epoch is used. | |
193 | ||
194 | (define priv:nano 1000000000) ; nanoseconds in a second | |
195 | (define priv:sid 86400) ; seconds in a day | |
196 | (define priv:sihd 43200) ; seconds in a half day | |
197 | (define priv:tai-epoch-in-jd 4881175/2) ; julian day number for 'the epoch' | |
198 | ||
199 | ;; FIXME: should this be something other than misc-error? | |
200 | (define (priv:time-error caller type value) | |
201 | (if value | |
202 | (throw 'misc-error caller "TIME-ERROR type ~A: ~S" (list type value) #f) | |
203 | (throw 'misc-error caller "TIME-ERROR type ~A" (list type) #f))) | |
204 | ||
205 | ;; A table of leap seconds | |
206 | ;; See ftp://maia.usno.navy.mil/ser7/tai-utc.dat | |
207 | ;; and update as necessary. | |
208 | ;; this procedures reads the file in the abover | |
209 | ;; format and creates the leap second table | |
210 | ;; it also calls the almost standard, but not R5 procedures read-line | |
211 | ;; & open-input-string | |
212 | ;; ie (set! priv:leap-second-table (priv:read-tai-utc-date "tai-utc.dat")) | |
213 | ||
214 | (define (priv:read-tai-utc-data filename) | |
215 | (define (convert-jd jd) | |
216 | (* (- (inexact->exact jd) priv:tai-epoch-in-jd) priv:sid)) | |
217 | (define (convert-sec sec) | |
218 | (inexact->exact sec)) | |
219 | (let ((port (open-input-file filename)) | |
220 | (table '())) | |
221 | (let loop ((line (read-line port))) | |
222 | (if (not (eq? line eof)) | |
223 | (begin | |
224 | (let* ((data (read (open-input-string | |
225 | (string-append "(" line ")")))) | |
226 | (year (car data)) | |
227 | (jd (cadddr (cdr data))) | |
228 | (secs (cadddr (cdddr data)))) | |
229 | (if (>= year 1972) | |
230 | (set! table (cons | |
231 | (cons (convert-jd jd) (convert-sec secs)) | |
232 | table))) | |
233 | (loop (read-line port)))))) | |
234 | table)) | |
235 | ||
236 | ;; each entry is (tai seconds since epoch . # seconds to subtract for utc) | |
237 | ;; note they go higher to lower, and end in 1972. | |
238 | (define priv:leap-second-table | |
239 | '((915148800 . 32) | |
240 | (867715200 . 31) | |
241 | (820454400 . 30) | |
242 | (773020800 . 29) | |
243 | (741484800 . 28) | |
244 | (709948800 . 27) | |
245 | (662688000 . 26) | |
246 | (631152000 . 25) | |
247 | (567993600 . 24) | |
248 | (489024000 . 23) | |
249 | (425865600 . 22) | |
250 | (394329600 . 21) | |
251 | (362793600 . 20) | |
252 | (315532800 . 19) | |
253 | (283996800 . 18) | |
254 | (252460800 . 17) | |
255 | (220924800 . 16) | |
256 | (189302400 . 15) | |
257 | (157766400 . 14) | |
258 | (126230400 . 13) | |
259 | (94694400 . 12) | |
260 | (78796800 . 11) | |
261 | (63072000 . 10))) | |
262 | ||
263 | (define (read-leap-second-table filename) | |
264 | (set! priv:leap-second-table (priv:read-tai-utc-data filename)) | |
265 | (values)) | |
266 | ||
267 | ||
268 | (define (priv:leap-second-delta utc-seconds) | |
269 | (letrec ((lsd (lambda (table) | |
270 | (cond ((>= utc-seconds (caar table)) | |
271 | (cdar table)) | |
272 | (else (lsd (cdr table))))))) | |
273 | (if (< utc-seconds (* (- 1972 1970) 365 priv:sid)) 0 | |
274 | (lsd priv:leap-second-table)))) | |
275 | ||
276 | ||
277 | ;;; the TIME structure; creates the accessors, too. | |
278 | ||
279 | (define-record-type time | |
280 | (make-time-unnormalized type nanosecond second) | |
281 | time? | |
282 | (type time-type set-time-type!) | |
283 | (nanosecond time-nanosecond set-time-nanosecond!) | |
284 | (second time-second set-time-second!)) | |
285 | ||
286 | (define (copy-time time) | |
287 | (make-time (time-type time) (time-nanosecond time) (time-second time))) | |
288 | ||
289 | (define (priv:time-normalize! t) | |
290 | (if (>= (abs (time-nanosecond t)) 1000000000) | |
291 | (begin | |
292 | (set-time-second! t (+ (time-second t) | |
293 | (quotient (time-nanosecond t) 1000000000))) | |
294 | (set-time-nanosecond! t (remainder (time-nanosecond t) | |
295 | 1000000000)))) | |
296 | (if (and (positive? (time-second t)) | |
297 | (negative? (time-nanosecond t))) | |
298 | (begin | |
299 | (set-time-second! t (- (time-second t) 1)) | |
300 | (set-time-nanosecond! t (+ 1000000000 (time-nanosecond t)))) | |
301 | (if (and (negative? (time-second t)) | |
302 | (positive? (time-nanosecond t))) | |
303 | (begin | |
304 | (set-time-second! t (+ (time-second t) 1)) | |
305 | (set-time-nanosecond! t (+ 1000000000 (time-nanosecond t)))))) | |
306 | t) | |
307 | ||
308 | (define (make-time type nanosecond second) | |
309 | (priv:time-normalize! (make-time-unnormalized type nanosecond second))) | |
310 | ||
311 | ;; Helpers | |
312 | ;; FIXME: finish this and publish it? | |
313 | (define (date->broken-down-time date) | |
314 | (let ((result (mktime 0))) | |
315 | ;; FIXME: What should we do about leap-seconds which may overflow | |
316 | ;; set-tm:sec? | |
317 | (set-tm:sec result (date-second date)) | |
318 | (set-tm:min result (date-minute date)) | |
319 | (set-tm:hour result (date-hour date)) | |
320 | ;; FIXME: SRFI day ranges from 0-31. (not compatible with set-tm:mday). | |
321 | (set-tm:mday result (date-day date)) | |
322 | (set-tm:month result (- (date-month date) 1)) | |
323 | ;; FIXME: need to signal error on range violation. | |
324 | (set-tm:year result (+ 1900 (date-year date))) | |
325 | (set-tm:isdst result -1) | |
326 | (set-tm:gmtoff result (- (date-zone-offset date))) | |
327 | result)) | |
328 | ||
329 | ;;; current-time | |
330 | ||
331 | ;;; specific time getters. | |
332 | ||
333 | (define (priv:current-time-utc) | |
334 | ;; Resolution is microseconds. | |
335 | (let ((tod (gettimeofday))) | |
336 | (make-time time-utc (* (cdr tod) 1000) (car tod)))) | |
337 | ||
338 | (define (priv:current-time-tai) | |
339 | ;; Resolution is microseconds. | |
340 | (let* ((tod (gettimeofday)) | |
341 | (sec (car tod)) | |
342 | (usec (cdr tod))) | |
343 | (make-time time-tai | |
344 | (* usec 1000) | |
345 | (+ (car tod) (priv:leap-second-delta seconds))))) | |
346 | ||
347 | ;;(define (priv:current-time-ms-time time-type proc) | |
348 | ;; (let ((current-ms (proc))) | |
349 | ;; (make-time time-type | |
350 | ;; (quotient current-ms 10000) | |
351 | ;; (* (remainder current-ms 1000) 10000)))) | |
352 | ||
353 | ;; -- we define it to be the same as TAI. | |
354 | ;; A different implemation of current-time-montonic | |
355 | ;; will require rewriting all of the time-monotonic converters, | |
356 | ;; of course. | |
357 | ||
358 | (define (priv:current-time-monotonic) | |
359 | ;; Resolution is microseconds. | |
360 | (priv:current-time-tai)) | |
361 | ||
362 | (define (priv:current-time-thread) | |
363 | (priv:time-error 'current-time 'unsupported-clock-type 'time-thread)) | |
364 | ||
365 | (define priv:ns-per-guile-tick (/ 1000000000 internal-time-units-per-second)) | |
366 | ||
367 | (define (priv:current-time-process) | |
368 | (let ((run-time (get-internal-run-time))) | |
369 | (make-time | |
370 | time-process | |
371 | (quotient run-time internal-time-units-per-second) | |
372 | (* (remainder run-time internal-time-units-per-second) | |
373 | priv:ns-per-guile-tick)))) | |
374 | ||
375 | (define (priv:current-time-process) | |
376 | (let ((run-time (get-internal-run-time))) | |
377 | (list | |
378 | 'time-process | |
379 | (* (remainder run-time internal-time-units-per-second) | |
380 | priv:ns-per-guile-tick) | |
381 | (quotient run-time internal-time-units-per-second)))) | |
382 | ||
383 | ;;(define (priv:current-time-gc) | |
384 | ;; (priv:current-time-ms-time time-gc current-gc-milliseconds)) | |
385 | ||
386 | (define (current-time . clock-type) | |
387 | (let ((clock-type (:optional clock-type time-utc))) | |
388 | (cond | |
389 | ((eq? clock-type time-tai) (priv:current-time-tai)) | |
390 | ((eq? clock-type time-utc) (priv:current-time-utc)) | |
391 | ((eq? clock-type time-monotonic) (priv:current-time-monotonic)) | |
392 | ((eq? clock-type time-thread) (priv:current-time-thread)) | |
393 | ((eq? clock-type time-process) (priv:current-time-process)) | |
394 | ;; ((eq? clock-type time-gc) (priv:current-time-gc)) | |
395 | (else (priv:time-error 'current-time 'invalid-clock-type clock-type))))) | |
396 | ||
397 | ;; -- Time Resolution | |
398 | ;; This is the resolution of the clock in nanoseconds. | |
399 | ;; This will be implementation specific. | |
400 | ||
401 | (define (time-resolution . clock-type) | |
402 | (let ((clock-type (:optional clock-type time-utc))) | |
403 | (case clock-type | |
404 | ((time-tai) 1000) | |
405 | ((time-utc) 1000) | |
406 | ((time-monotonic) 1000) | |
407 | ((time-process) priv:ns-per-guile-tick) | |
408 | ;; ((eq? clock-type time-thread) 1000) | |
409 | ;; ((eq? clock-type time-gc) 10000) | |
410 | (else (priv:time-error 'time-resolution 'invalid-clock-type clock-type))))) | |
411 | ||
412 | ;; -- Time comparisons | |
413 | ||
414 | (define (time=? t1 t2) | |
415 | ;; Arrange tests for speed and presume that t1 and t2 are actually times. | |
416 | ;; also presume it will be rare to check two times of different types. | |
417 | (and (= (time-second t1) (time-second t2)) | |
418 | (= (time-nanosecond t1) (time-nanosecond 2)) | |
419 | (eq? (time-type t1) (time-type t2)))) | |
420 | ||
421 | (define (time>? t1 t2) | |
422 | (or (> (time-second t1) (time-second t2)) | |
423 | (and (= (time-second t1) (time-second t2)) | |
424 | (> (time-nanosecond t1) (time-nanosecond t2))))) | |
425 | ||
426 | (define (time<? t1 t2) | |
427 | (or (< (time-second t1) (time-second t2)) | |
428 | (and (= (time-second t1) (time-second t2)) | |
429 | (< (time-nanosecond t1) (time-nanosecond t2))))) | |
430 | ||
431 | (define (time>=? t1 t2) | |
432 | (or (> (time-second t1) (time-second t2)) | |
433 | (and (= (time-second t1) (time-second t2)) | |
434 | (>= (time-nanosecond t1) (time-nanosecond t2))))) | |
435 | ||
436 | (define (time<=? t1 t2) | |
437 | (or (< (time-second time1) (time-second time2)) | |
438 | (and (= (time-second time1) (time-second time2)) | |
439 | (<= (time-nanosecond time1) (time-nanosecond time2))))) | |
440 | ||
441 | ;; -- Time arithmetic | |
442 | ||
443 | (define (time-difference! time1 time2) | |
444 | (let ((sec-diff (- (time-second time1) (time-second time2))) | |
445 | (nsec-diff (- (time-nanosecond time1) (time-nanosecond time2)))) | |
446 | (set-time-type! time1 time-duration) | |
447 | (set-time-second! time1 sec-diff) | |
448 | (set-time-nanosecond! time1 nsec-diff) | |
449 | (priv:time-normalize! time1))) | |
450 | ||
451 | (define (time-difference time1 time2) | |
452 | (let ((result (copy-time time1))) | |
453 | (time-difference! result time2))) | |
454 | ||
455 | (define (add-duration! t duration) | |
456 | (if (not (eq? (time-type duration) time-duration)) | |
457 | (priv:time-error 'add-duration 'not-duration duration) | |
458 | (let ((sec-plus (+ (time-second t) (time-second duration))) | |
459 | (nsec-plus (+ (time-nanosecond t) (time-nanosecond duration)))) | |
460 | (set-time-second! t sec-plus) | |
461 | (set-time-nanosecond! t nsec-plus) | |
462 | (priv:time-normalize! t)))) | |
463 | ||
464 | (define (priv:add-duration t duration) | |
465 | (let ((result (copy-time t))) | |
466 | (add-duration! result))) | |
467 | ||
468 | (define (subtract-duration! t duration) | |
469 | (if (not (eq? (time-type duration) time-duration)) | |
470 | (priv:time-error 'add-duration 'not-duration duration) | |
471 | (let ((sec-minus (- (time-second t) (time-second duration))) | |
472 | (nsec-minus (- (time-nanosecond t) (time-nanosecond duration)))) | |
473 | (set-time-second! t sec-minus) | |
474 | (set-time-nanosecond! t nsec-minus) | |
475 | (priv:time-normalize! t)))) | |
476 | ||
477 | (define (subtract-duration time1 duration) | |
478 | (let ((result (copy-time time1))) | |
479 | (subtract-duration! result duration))) | |
480 | ||
481 | ;; -- Converters between types. | |
482 | ||
483 | (define (priv:time-tai->time-utc! time-in time-out caller) | |
484 | (if (not (eq? (time-type time-in) time-tai)) | |
485 | (priv:time-error caller 'incompatible-time-types time-in)) | |
486 | (set-time-type! time-out time-utc) | |
487 | (set-time-nanosecond! time-out (time-nanosecond time-in)) | |
488 | (set-time-second! time-out (- (time-second time-in) | |
489 | (priv:leap-second-delta | |
490 | (time-second time-in)))) | |
491 | time-out) | |
492 | ||
493 | (define (time-tai->time-utc time-in) | |
494 | (priv:time-tai->time-utc! time-in (make-time #f #f #f) 'time-tai->time-utc)) | |
495 | ||
496 | ||
497 | (define (time-tai->time-utc! time-in) | |
498 | (priv:time-tai->time-utc! time-in time-in 'time-tai->time-utc!)) | |
499 | ||
500 | (define (priv:time-utc->time-tai! time-in time-out caller) | |
501 | (if (not (eq? (time-type time-in) time-utc)) | |
502 | (priv:time-error caller 'incompatible-time-types time-in)) | |
503 | (set-time-type! time-out time-tai) | |
504 | (set-time-nanosecond! time-out (time-nanosecond time-in)) | |
505 | (set-time-second! time-out (+ (time-second time-in) | |
506 | (priv:leap-second-delta | |
507 | (time-second time-in)))) | |
508 | time-out) | |
509 | ||
510 | (define (time-utc->time-tai time-in) | |
511 | (priv:time-utc->time-tai! time-in (make-time #f #f #f) 'time-utc->time-tai)) | |
512 | ||
513 | (define (time-utc->time-tai! time-in) | |
514 | (priv:time-utc->time-tai! time-in time-in 'time-utc->time-tai!)) | |
515 | ||
516 | ;; -- these depend on time-monotonic having the same definition as time-tai! | |
517 | (define (time-monotonic->time-utc time-in) | |
518 | (if (not (eq? (time-type time-in) time-monotonic)) | |
519 | (priv:time-error caller 'incompatible-time-types time-in)) | |
520 | (let ((ntime (copy-time time-in))) | |
521 | (set-time-type! ntime time-tai) | |
522 | (priv:time-tai->time-utc! ntime ntime 'time-monotonic->time-utc))) | |
523 | ||
524 | (define (time-monotonic->time-utc! time-in) | |
525 | (if (not (eq? (time-type time-in) time-monotonic)) | |
526 | (priv:time-error caller 'incompatible-time-types time-in)) | |
527 | (set-time-type! time-in time-tai) | |
528 | (priv:time-tai->time-utc! ntime ntime 'time-monotonic->time-utc)) | |
529 | ||
530 | (define (time-monotonic->time-tai time-in) | |
531 | (if (not (eq? (time-type time-in) time-monotonic)) | |
532 | (priv:time-error caller 'incompatible-time-types time-in)) | |
533 | (let ((ntime (copy-time time-in))) | |
534 | (set-time-type! ntime time-tai) | |
535 | ntime)) | |
536 | ||
537 | (define (time-monotonic->time-tai! time-in) | |
538 | (if (not (eq? (time-type time-in) time-monotonic)) | |
539 | (priv:time-error caller 'incompatible-time-types time-in)) | |
540 | (set-time-type! time-in time-tai) | |
541 | time-in) | |
542 | ||
543 | (define (time-utc->time-monotonic time-in) | |
544 | (if (not (eq? (time-type time-in) time-utc)) | |
545 | (priv:time-error caller 'incompatible-time-types time-in)) | |
546 | (let ((ntime (priv:time-utc->time-tai! time-in (make-time #f #f #f) | |
547 | 'time-utc->time-monotonic))) | |
548 | (set-time-type! ntime time-monotonic) | |
549 | ntime)) | |
550 | ||
551 | (define (time-utc->time-monotonic! time-in) | |
552 | (if (not (eq? (time-type time-in) time-utc)) | |
553 | (priv:time-error caller 'incompatible-time-types time-in)) | |
554 | (let ((ntime (priv:time-utc->time-tai! time-in time-in | |
555 | 'time-utc->time-monotonic!))) | |
556 | (set-time-type! ntime time-monotonic) | |
557 | ntime)) | |
558 | ||
559 | (define (time-tai->time-monotonic time-in) | |
560 | (if (not (eq? (time-type time-in) time-tai)) | |
561 | (priv:time-error caller 'incompatible-time-types time-in)) | |
562 | (let ((ntime (copy-time time-in))) | |
563 | (set-time-type! ntime time-monotonic) | |
564 | ntime)) | |
565 | ||
566 | (define (time-tai->time-monotonic! time-in) | |
567 | (if (not (eq? (time-type time-in) time-tai)) | |
568 | (priv:time-error caller 'incompatible-time-types time-in)) | |
569 | (set-time-type! time-in time-monotonic) | |
570 | time-in) | |
571 | ||
572 | ;; -- Date Structures | |
573 | ||
574 | (define-record-type date | |
575 | (make-date-unnormalized nanosecond second minute | |
576 | hour day month | |
577 | year | |
578 | zone-offset) | |
579 | date? | |
580 | (nanosecond date-nanosecond) | |
581 | (second date-second) | |
582 | (minute date-minute) | |
583 | (hour date-hour) | |
584 | (day date-day) | |
585 | (month date-month) | |
586 | (year date-year) | |
587 | (zone-offset date-zone-offset)) | |
588 | ||
589 | ;; gives the julian day which starts at noon. | |
590 | (define (priv:encode-julian-day-number day month year) | |
591 | (let* ((a (quotient (- 14 month) 12)) | |
592 | (y (- (+ year 4800) a (if (negative? year) -1 0))) | |
593 | (m (- (+ month (* 12 a)) 3))) | |
594 | (+ day | |
595 | (quotient (+ (* 153 m) 2) 5) | |
596 | (* 365 y) | |
597 | (quotient y 4) | |
598 | (- (quotient y 100)) | |
599 | (quotient y 400) | |
600 | -32045))) | |
601 | ||
602 | (define (priv:split-real r) | |
603 | (if (integer? r) (values r 0) | |
604 | (let ((l (truncate r))) | |
605 | (values l (- r l))))) | |
606 | ||
607 | ;; gives the seconds/date/month/year | |
608 | (define (priv:decode-julian-day-number jdn) | |
609 | (let* ((days (truncate jdn)) | |
610 | (a (+ days 32044)) | |
611 | (b (quotient (+ (* 4 a) 3) 146097)) | |
612 | (c (- a (quotient (* 146097 b) 4))) | |
613 | (d (quotient (+ (* 4 c) 3) 1461)) | |
614 | (e (- c (quotient (* 1461 d) 4))) | |
615 | (m (quotient (+ (* 5 e) 2) 153)) | |
616 | (y (+ (* 100 b) d -4800 (quotient m 10)))) | |
617 | (values ; seconds date month year | |
618 | (* (- jdn days) priv:sid) | |
619 | (+ e (- (quotient (+ (* 153 m) 2) 5)) 1) | |
620 | (+ m 3 (* -12 (quotient m 10))) | |
621 | (if (>= 0 y) (- y 1) y)))) | |
622 | ||
623 | ;; relies on the fact that we named our time zone accessor | |
624 | ;; differently from MzScheme's.... | |
625 | ;; This should be written to be OS specific. | |
626 | ||
627 | (define (priv:local-tz-offset) | |
628 | ;; SRFI uses seconds West, but guile (and libc) use seconds East. | |
629 | (- (tm:gmtoff (localtime 0)))) | |
630 | ||
631 | ;; special thing -- ignores nanos | |
632 | (define (priv:time->julian-day-number seconds tz-offset) | |
633 | (+ (/ (+ seconds tz-offset priv:sihd) | |
634 | priv:sid) | |
635 | priv:tai-epoch-in-jd)) | |
636 | ||
637 | (define (priv:leap-second? second) | |
638 | (and (assoc second priv:leap-second-table) #t)) | |
639 | ||
640 | (define (time-utc->date time . tz-offset) | |
641 | (if (not (eq? (time-type time) time-utc)) | |
642 | (priv:time-error 'time->date 'incompatible-time-types time)) | |
643 | (let* ((offset (:optional tz-offset (priv:local-tz-offset))) | |
644 | (leap-second? (priv:leap-second? (+ offset (time-second time)))) | |
645 | (jdn (priv:time->julian-day-number (if leap-second? | |
646 | (- (time-second time) 1) | |
647 | (time-second time)) | |
648 | offset))) | |
649 | ||
650 | (call-with-values (lambda () (priv:decode-julian-day-number jdn)) | |
651 | (lambda (secs date month year) | |
652 | (let* ((hours (quotient secs (* 60 60))) | |
653 | (rem (remainder secs (* 60 60))) | |
654 | (minutes (quotient rem 60)) | |
655 | (seconds (remainder rem 60))) | |
656 | (make-date (time-nanosecond time) | |
657 | (if leap-second? (+ seconds 1) seconds) | |
658 | minutes | |
659 | hours | |
660 | date | |
661 | month | |
662 | year | |
663 | offset)))))) | |
664 | ||
665 | (define (time-tai->date time . tz-offset) | |
666 | (if (not (eq? (time-type time) time-tai)) | |
667 | (priv:time-error 'time->date 'incompatible-time-types time)) | |
668 | (let* ((offset (:optional tz-offset (priv:local-tz-offset))) | |
669 | (seconds (- (time-second time) | |
670 | (priv:leap-second-delta (time-second time)))) | |
671 | (leap-second? (priv:leap-second? (+ offset seconds))) | |
672 | (jdn (priv:time->julian-day-number (if leap-second? | |
673 | (- seconds 1) | |
674 | seconds) | |
675 | offset))) | |
676 | (call-with-values (lambda () (priv:decode-julian-day-number jdn)) | |
677 | (lambda (secs date month year) | |
678 | ;; adjust for leap seconds if necessary ... | |
679 | (let* ((hours (quotient secs (* 60 60))) | |
680 | (rem (remainder secs (* 60 60))) | |
681 | (minutes (quotient rem 60)) | |
682 | (seconds (remainder rem 60))) | |
683 | (make-date (time-nanosecond time) | |
684 | (if leap-second? (+ seconds 1) seconds) | |
685 | minutes | |
686 | hours | |
687 | date | |
688 | month | |
689 | year | |
690 | offset)))))) | |
691 | ||
692 | ;; this is the same as time-tai->date. | |
693 | (define (time-monotonic->date time . tz-offset) | |
694 | (if (not (eq? (time-type time) time-monotonic)) | |
695 | (priv:time-error 'time->date 'incompatible-time-types time)) | |
696 | (let* ((offset (:optional tz-offset (priv:local-tz-offset))) | |
697 | (seconds (- (time-second time) | |
698 | (priv:leap-second-delta (time-second time)))) | |
699 | (leap-second? (priv:leap-second? (+ offset seconds))) | |
700 | (jdn (priv:time->julian-day-number (if leap-second? | |
701 | (- seconds 1) | |
702 | seconds) | |
703 | offset))) | |
704 | (call-with-values (lambda () (priv:decode-julian-day-number jdn)) | |
705 | (lambda (secs date month year) | |
706 | ;; adjust for leap seconds if necessary ... | |
707 | (let* ((hours (quotient secs (* 60 60))) | |
708 | (rem (remainder secs (* 60 60))) | |
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 | (define (date->time-utc date) | |
721 | (let ((jdays (- (priv:encode-julian-day-number (date-day date) | |
722 | (date-month date) | |
723 | (date-year date)) | |
724 | priv:tai-epoch-in-jd))) | |
725 | (make-time | |
726 | time-utc | |
727 | (date-nanosecond date) | |
728 | (+ (* (- jdays 1/2) 24 60 60) | |
729 | (* (date-hour date) 60 60) | |
730 | (* (date-minute date) 60) | |
731 | (date-second date))))) | |
732 | ||
733 | (define (date->time-tai date) | |
734 | (time-utc->time-tai! (date->time-utc date))) | |
735 | ||
736 | (define (date->time-monotonic date) | |
737 | (time-utc->time-monotonic! (date->time-utc date))) | |
738 | ||
739 | (define (priv:leap-year? year) | |
740 | (or (= (modulo year 400) 0) | |
741 | (and (= (modulo year 4) 0) (not (= (modulo year 100) 0))))) | |
742 | ||
743 | (define (leap-year? date) | |
744 | (priv:leap-year? (date-year date))) | |
745 | ||
746 | (define priv:month-assoc '((1 . 31) (2 . 59) (3 . 90) (4 . 120) | |
747 | (5 . 151) (6 . 181) (7 . 212) (8 . 243) | |
748 | (9 . 273) (10 . 304) (11 . 334) (12 . 365))) | |
749 | ||
750 | (define (priv:year-day day month year) | |
751 | (let ((days-pr (assoc day priv:month-assoc))) | |
752 | (if (not days-pr) | |
753 | (priv:error 'date-year-day 'invalid-month-specification month)) | |
754 | (if (and (priv:leap-year? year) (> month 2)) | |
755 | (+ day (cdr days-pr) 1) | |
756 | (+ day (cdr days-pr))))) | |
757 | ||
758 | (define (date-year-day date) | |
759 | (priv:year-day (date-day date) (date-month date) (date-year date))) | |
760 | ||
761 | ;; from calendar faq | |
762 | (define (priv:week-day day month year) | |
763 | (let* ((a (quotient (- 14 month) 12)) | |
764 | (y (- year a)) | |
765 | (m (+ month (* 12 a) -2))) | |
766 | (modulo (+ day | |
767 | y | |
768 | (quotient y 4) | |
769 | (- (quotient y 100)) | |
770 | (quotient y 400) | |
771 | (quotient (* 31 m) 12)) | |
772 | 7))) | |
773 | ||
774 | (define (date-week-day date) | |
775 | (priv:week-day (date-day date) (date-month date) (date-year date))) | |
776 | ||
777 | (define (priv:days-before-first-week date day-of-week-starting-week) | |
778 | (let* ((first-day (make-date 0 0 0 0 | |
779 | 1 | |
780 | 1 | |
781 | (date-year date) | |
782 | #f)) | |
783 | (fdweek-day (date-week-day first-day))) | |
784 | (modulo (- day-of-week-starting-week fdweek-day) | |
785 | 7))) | |
786 | ||
787 | (define (date-week-number date day-of-week-starting-week) | |
788 | (quotient (- (date-year-day date) | |
789 | (priv:days-before-first-week date day-of-week-starting-week)) | |
790 | 7)) | |
791 | ||
792 | (define (current-date . tz-offset) | |
793 | (time-utc->date (current-time time-utc) | |
794 | (:optional tz-offset (priv:local-tz-offset)))) | |
795 | ||
796 | ;; given a 'two digit' number, find the year within 50 years +/- | |
797 | (define (priv:natural-year n) | |
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)) | |
813 | (year (date-year date))) | |
814 | (+ (priv:encode-julian-day-number day month year) | |
815 | (- 1/2) | |
816 | (+ (/ (+ (* hour 60 60) | |
817 | (* minute 60) | |
818 | second | |
819 | (/ nanosecond priv:nano)) | |
820 | priv:sid))))) | |
821 | ||
822 | (define (date->modified-julian-day date) | |
823 | (- (date->julian-day date) | |
824 | 4800001/2)) | |
825 | ||
826 | (define (time-utc->julian-day time) | |
827 | (if (not (eq? (time-type time) time-utc)) | |
828 | (priv:time-error 'time->date 'incompatible-time-types time)) | |
829 | (+ (/ (+ (time-second time) (/ (time-nanosecond time) priv:nano)) | |
830 | priv:sid) | |
831 | priv:tai-epoch-in-jd)) | |
832 | ||
833 | (define (time-utc->modified-julian-day time) | |
834 | (- (time-utc->julian-day time) | |
835 | 4800001/2)) | |
836 | ||
837 | (define (time-tai->julian-day time) | |
838 | (if (not (eq? (time-type time) time-tai)) | |
839 | (priv:time-error 'time->date 'incompatible-time-types time)) | |
840 | (+ (/ (+ (- (time-second time) | |
841 | (priv:leap-second-delta (time-second time))) | |
842 | (/ (time-nanosecond time) priv:nano)) | |
843 | priv:sid) | |
844 | priv:tai-epoch-in-jd)) | |
845 | ||
846 | (define (time-tai->modified-julian-day time) | |
847 | (- (time-tai->julian-day time) | |
848 | 4800001/2)) | |
849 | ||
850 | ;; this is the same as time-tai->julian-day | |
851 | (define (time-monotonic->julian-day time) | |
852 | (if (not (eq? (time-type time) time-monotonic)) | |
853 | (priv:time-error 'time->date 'incompatible-time-types time)) | |
854 | (+ (/ (+ (- (time-second time) | |
855 | (priv:leap-second-delta (time-second time))) | |
856 | (/ (time-nanosecond time) priv:nano)) | |
857 | priv:sid) | |
858 | priv:tai-epoch-in-jd)) | |
859 | ||
860 | (define (time-monotonic->modified-julian-day time) | |
861 | (- (time-monotonic->julian-day time) | |
862 | 4800001/2)) | |
863 | ||
864 | (define (julian-day->time-utc jdn) | |
865 | (let ((secs (* priv:sid (- jdn priv:tai-epoch-in-jd)))) | |
866 | (receive (seconds parts) | |
867 | (priv:split-real secs) | |
868 | (make-time time-utc | |
869 | (inexact->exact (truncate (* parts priv:nano))) | |
870 | (inexact->exact seconds))))) | |
871 | ||
872 | (define (julian-day->time-tai jdn) | |
873 | (time-utc->time-tai! (julian-day->time-utc jdn))) | |
874 | ||
875 | (define (julian-day->time-monotonic jdn) | |
876 | (time-utc->time-monotonic! (julian-day->time-utc jdn))) | |
877 | ||
878 | (define (julian-day->date jdn . tz-offset) | |
879 | (let ((offset (:optional tz-offset (priv:local-tz-offset)))) | |
880 | (time-utc->date (julian-day->time-utc jdn) offset))) | |
881 | ||
882 | (define (modified-julian-day->date jdn . tz-offset) | |
883 | (let ((offset (:optional tz-offset (priv:local-tz-offset)))) | |
884 | (julian-day->date (+ jdn 4800001/2) offset))) | |
885 | ||
886 | (define (modified-julian-day->time-utc jdn) | |
887 | (julian-day->time-utc (+ jdn 4800001/2))) | |
888 | ||
889 | (define (modified-julian-day->time-tai jdn) | |
890 | (julian-day->time-tai (+ jdn 4800001/2))) | |
891 | ||
892 | (define (modified-julian-day->time-monotonic jdn) | |
893 | (julian-day->time-monotonic (+ jdn 4800001/2))) | |
894 | ||
895 | (define (current-julian-day) | |
896 | (time-utc->julian-day (current-time time-utc))) | |
897 | ||
898 | (define (current-modified-julian-day) | |
899 | (time-utc->modified-julian-day (current-time time-utc))) | |
900 | ||
901 | ;; returns a string rep. of number N, of minimum LENGTH, padded with | |
902 | ;; character PAD-WITH. If PAD-WITH is #f, no padding is done, and it's | |
903 | ;; as if number->string was used. if string is longer than or equal | |
904 | ;; in length to LENGTH, it's as if number->string was used. | |
905 | ||
906 | (define (priv:padding n pad-with length) | |
907 | (let* ((str (number->string n)) | |
908 | (str-len (string-length str))) | |
909 | (if (or (>= str-len length) | |
910 | (not pad-with)) | |
911 | str | |
912 | (string-append (make-string (- length str-len) pad-with) str)))) | |
913 | ||
914 | (define (priv:last-n-digits i n) | |
915 | (abs (remainder i (expt 10 n)))) | |
916 | ||
917 | (define (priv:locale-abbr-weekday n) | |
918 | (vector-ref priv:locale-abbr-weekday-vector n)) | |
919 | ||
920 | (define (priv:locale-long-weekday n) | |
921 | (vector-ref priv:locale-long-weekday-vector n)) | |
922 | ||
923 | (define (priv:locale-abbr-month n) | |
924 | (vector-ref priv:locale-abbr-month-vector n)) | |
925 | ||
926 | (define (priv:locale-long-month n) | |
927 | (vector-ref priv:locale-long-month-vector n)) | |
928 | ||
929 | (define (priv:vector-find needle haystack comparator) | |
930 | (let ((len (vector-length haystack))) | |
931 | (define (priv:vector-find-int index) | |
932 | (cond | |
933 | ((>= index len) #f) | |
934 | ((comparator needle (vector-ref haystack index)) index) | |
935 | (else (priv:vector-find-int (+ index 1))))) | |
936 | (priv:vector-find-int 0))) | |
937 | ||
938 | (define (priv:locale-abbr-weekday->index string) | |
939 | (priv:vector-find string priv:locale-abbr-weekday-vector string=?)) | |
940 | ||
941 | (define (priv:locale-long-weekday->index string) | |
942 | (priv:vector-find string priv:locale-long-weekday-vector string=?)) | |
943 | ||
944 | (define (priv:locale-abbr-month->index string) | |
945 | (priv:vector-find string priv:locale-abbr-month-vector string=?)) | |
946 | ||
947 | (define (priv:locale-long-month->index string) | |
948 | (priv:vector-find string priv:locale-long-month-vector string=?)) | |
949 | ||
950 | ||
951 | ||
952 | ;; do nothing. | |
953 | ;; Your implementation might want to do something... | |
954 | ;; | |
955 | ;; FIXME: is it even possible to do anything reasonable here? | |
956 | (define (priv:locale-print-time-zone date port) | |
957 | (values)) | |
958 | ||
959 | ;; FIXME: we should use strftime to determine this dynamically if possible. | |
960 | ;; Again, locale specific. | |
961 | (define (priv:locale-am/pm hr) | |
962 | (if (> hr 11) priv:locale-pm priv:locale-am)) | |
963 | ||
964 | (define (priv:tz-printer offset port) | |
965 | (cond | |
966 | ((= offset 0) (display "Z" port)) | |
967 | ((negative? offset) (display "-" port)) | |
968 | (else (display "+" port))) | |
969 | (if (not (= offset 0)) | |
970 | (let ((hours (abs (quotient offset (* 60 60)))) | |
971 | (minutes (abs (quotient (remainder offset (* 60 60)) 60)))) | |
972 | (display (priv:padding hours #\0 2) port) | |
973 | (display (priv:padding minutes #\0 2) port)))) | |
974 | ||
975 | ;; STOPPED-HERE | |
976 | ||
977 | ;; A table of output formatting directives. | |
978 | ;; the first time is the format char. | |
979 | ;; the second is a procedure that takes the date, a padding character | |
980 | ;; (which might be #f), and the output port. | |
981 | ;; | |
982 | (define priv:directives | |
983 | (list | |
984 | (cons #\~ (lambda (date pad-with port) | |
985 | (display #\~ port))) | |
986 | (cons #\a (lambda (date pad-with port) | |
987 | (display (priv:locale-abbr-weekday (date-week-day date)) | |
988 | port))) | |
989 | (cons #\A (lambda (date pad-with port) | |
990 | (display (priv:locale-long-weekday (date-week-day date)) | |
991 | port))) | |
992 | (cons #\b (lambda (date pad-with port) | |
993 | (display (priv:locale-abbr-month (date-month date)) | |
994 | port))) | |
995 | (cons #\B (lambda (date pad-with port) | |
996 | (display (priv:locale-long-month (date-month date)) | |
997 | port))) | |
998 | (cons #\c (lambda (date pad-with port) | |
999 | (display (date->string date priv:locale-date-time-format) port))) | |
1000 | (cons #\d (lambda (date pad-with port) | |
1001 | (display (priv:padding (date-day date) | |
1002 | #\0 2) | |
1003 | port))) | |
1004 | (cons #\D (lambda (date pad-with port) | |
1005 | (display (date->string date "~m/~d/~y") port))) | |
1006 | (cons #\e (lambda (date pad-with port) | |
1007 | (display (priv:padding (date-day date) | |
1008 | #\Space 2) | |
1009 | port))) | |
1010 | (cons #\f (lambda (date pad-with port) | |
1011 | (if (> (date-nanosecond date) | |
1012 | priv:nano) | |
1013 | (display (priv:padding (+ (date-second date) 1) | |
1014 | pad-with 2) | |
1015 | port) | |
1016 | (display (priv:padding (date-second date) | |
1017 | pad-with 2) | |
1018 | port)) | |
1019 | (receive (i f) | |
1020 | (priv:split-real (/ | |
1021 | (date-nanosecond date) | |
1022 | priv:nano 1.0)) | |
1023 | (let* ((ns (number->string f)) | |
1024 | (le (string-length ns))) | |
1025 | (if (> le 2) | |
1026 | (begin | |
1027 | (display priv:locale-number-separator port) | |
1028 | (display (substring ns 2 le) port))))))) | |
1029 | (cons #\h (lambda (date pad-with port) | |
1030 | (display (date->string date "~b") port))) | |
1031 | (cons #\H (lambda (date pad-with port) | |
1032 | (display (priv:padding (date-hour date) | |
1033 | pad-with 2) | |
1034 | port))) | |
1035 | (cons #\I (lambda (date pad-with port) | |
1036 | (let ((hr (date-hour date))) | |
1037 | (if (> hr 12) | |
1038 | (display (priv:padding (- hr 12) | |
1039 | pad-with 2) | |
1040 | port) | |
1041 | (display (priv:padding hr | |
1042 | pad-with 2) | |
1043 | port))))) | |
1044 | (cons #\j (lambda (date pad-with port) | |
1045 | (display (priv:padding (date-year-day date) | |
1046 | pad-with 3) | |
1047 | port))) | |
1048 | (cons #\k (lambda (date pad-with port) | |
1049 | (display (priv:padding (date-hour date) | |
1050 | #\Space 2) | |
1051 | port))) | |
1052 | (cons #\l (lambda (date pad-with port) | |
1053 | (let ((hr (if (> (date-hour date) 12) | |
1054 | (- (date-hour date) 12) (date-hour date)))) | |
1055 | (display (priv:padding hr #\Space 2) | |
1056 | port)))) | |
1057 | (cons #\m (lambda (date pad-with port) | |
1058 | (display (priv:padding (date-month date) | |
1059 | pad-with 2) | |
1060 | port))) | |
1061 | (cons #\M (lambda (date pad-with port) | |
1062 | (display (priv:padding (date-minute date) | |
1063 | pad-with 2) | |
1064 | port))) | |
1065 | (cons #\n (lambda (date pad-with port) | |
1066 | (newline port))) | |
1067 | (cons #\N (lambda (date pad-with port) | |
1068 | (display (priv:padding (date-nanosecond date) | |
1069 | pad-with 7) | |
1070 | port))) | |
1071 | (cons #\p (lambda (date pad-with port) | |
1072 | (display (priv:locale-am/pm (date-hour date)) port))) | |
1073 | (cons #\r (lambda (date pad-with port) | |
1074 | (display (date->string date "~I:~M:~S ~p") port))) | |
1075 | (cons #\s (lambda (date pad-with port) | |
1076 | (display (time-second (date->time-utc date)) port))) | |
1077 | (cons #\S (lambda (date pad-with port) | |
1078 | (if (> (date-nanosecond date) | |
1079 | priv:nano) | |
1080 | (display (priv:padding (+ (date-second date) 1) | |
1081 | pad-with 2) | |
1082 | port) | |
1083 | (display (priv:padding (date-second date) | |
1084 | pad-with 2) | |
1085 | port)))) | |
1086 | (cons #\t (lambda (date pad-with port) | |
1087 | (display #\Tab port))) | |
1088 | (cons #\T (lambda (date pad-with port) | |
1089 | (display (date->string date "~H:~M:~S") port))) | |
1090 | (cons #\U (lambda (date pad-with port) | |
1091 | (if (> (priv:days-before-first-week date 0) 0) | |
1092 | (display (priv:padding (+ (date-week-number date 0) 1) | |
1093 | #\0 2) port) | |
1094 | (display (priv:padding (date-week-number date 0) | |
1095 | #\0 2) port)))) | |
1096 | (cons #\V (lambda (date pad-with port) | |
1097 | (display (priv:padding (date-week-number date 1) | |
1098 | #\0 2) port))) | |
1099 | (cons #\w (lambda (date pad-with port) | |
1100 | (display (date-week-day date) port))) | |
1101 | (cons #\x (lambda (date pad-with port) | |
1102 | (display (date->string date priv:locale-short-date-format) port))) | |
1103 | (cons #\X (lambda (date pad-with port) | |
1104 | (display (date->string date priv:locale-time-format) port))) | |
1105 | (cons #\W (lambda (date pad-with port) | |
1106 | (if (> (priv:days-before-first-week date 1) 0) | |
1107 | (display (priv:padding (+ (date-week-number date 1) 1) | |
1108 | #\0 2) port) | |
1109 | (display (priv:padding (date-week-number date 1) | |
1110 | #\0 2) port)))) | |
1111 | (cons #\y (lambda (date pad-with port) | |
1112 | (display (priv:padding (priv:last-n-digits | |
1113 | (date-year date) 2) | |
1114 | pad-with | |
1115 | 2) | |
1116 | port))) | |
1117 | (cons #\Y (lambda (date pad-with port) | |
1118 | (display (date-year date) port))) | |
1119 | (cons #\z (lambda (date pad-with port) | |
1120 | (priv:tz-printer (date-zone-offset date) port))) | |
1121 | (cons #\Z (lambda (date pad-with port) | |
1122 | (priv:locale-print-time-zone date port))) | |
1123 | (cons #\1 (lambda (date pad-with port) | |
1124 | (display (date->string date "~Y-~m-~d") port))) | |
1125 | (cons #\2 (lambda (date pad-with port) | |
1126 | (display (date->string date "~k:~M:~S~z") port))) | |
1127 | (cons #\3 (lambda (date pad-with port) | |
1128 | (display (date->string date "~k:~M:~S") port))) | |
1129 | (cons #\4 (lambda (date pad-with port) | |
1130 | (display (date->string date "~Y-~m-~dT~k:~M:~S~z") port))) | |
1131 | (cons #\5 (lambda (date pad-with port) | |
1132 | (display (date->string date "~Y-~m-~dT~k:~M:~S") port))))) | |
1133 | ||
1134 | ||
1135 | (define (priv:get-formatter char) | |
1136 | (let ((associated (assoc char priv:directives))) | |
1137 | (if associated (cdr associated) #f))) | |
1138 | ||
1139 | (define (priv:date-printer date index format-string str-len port) | |
1140 | (if (>= index str-len) | |
1141 | (values) | |
1142 | (let ((current-char (string-ref format-string index))) | |
1143 | (if (not (char=? current-char #\~)) | |
1144 | (begin | |
1145 | (display current-char port) | |
1146 | (priv:date-printer date (+ index 1) format-string str-len port)) | |
1147 | (if (= (+ index 1) str-len) ; bad format string. | |
1148 | (priv:time-error 'priv:date-printer 'bad-date-format-string | |
1149 | format-string) | |
1150 | (let ((pad-char? (string-ref format-string (+ index 1)))) | |
1151 | (cond | |
1152 | ((char=? pad-char? #\-) | |
1153 | (if (= (+ index 2) str-len) ; bad format string. | |
1154 | (priv:time-error 'priv:date-printer | |
1155 | 'bad-date-format-string | |
1156 | format-string) | |
1157 | (let ((formatter (priv:get-formatter | |
1158 | (string-ref format-string | |
1159 | (+ index 2))))) | |
1160 | (if (not formatter) | |
1161 | (priv:time-error 'priv:date-printer | |
1162 | 'bad-date-format-string | |
1163 | format-string) | |
1164 | (begin | |
1165 | (formatter date #f port) | |
1166 | (priv:date-printer date | |
1167 | (+ index 3) | |
1168 | format-string | |
1169 | str-len | |
1170 | port)))))) | |
1171 | ||
1172 | ((char=? pad-char? #\_) | |
1173 | (if (= (+ index 2) str-len) ; bad format string. | |
1174 | (priv:time-error 'priv:date-printer | |
1175 | 'bad-date-format-string | |
1176 | format-string) | |
1177 | (let ((formatter (priv:get-formatter | |
1178 | (string-ref format-string | |
1179 | (+ index 2))))) | |
1180 | (if (not formatter) | |
1181 | (priv:time-error 'priv:date-printer | |
1182 | 'bad-date-format-string | |
1183 | format-string) | |
1184 | (begin | |
1185 | (formatter date #\Space port) | |
1186 | (priv:date-printer date | |
1187 | (+ index 3) | |
1188 | format-string | |
1189 | str-len | |
1190 | port)))))) | |
1191 | (else | |
1192 | (let ((formatter (priv:get-formatter | |
1193 | (string-ref format-string | |
1194 | (+ index 1))))) | |
1195 | (if (not formatter) | |
1196 | (priv:time-error 'priv:date-printer | |
1197 | 'bad-date-format-string | |
1198 | format-string) | |
1199 | (begin | |
1200 | (formatter date #\0 port) | |
1201 | (priv:date-printer date | |
1202 | (+ index 2) | |
1203 | format-string | |
1204 | str-len | |
1205 | port)))))))))))) | |
1206 | ||
1207 | ||
1208 | (define (date->string date . format-string) | |
1209 | (let ((str-port (open-output-string)) | |
1210 | (fmt-str (:optional format-string "~c"))) | |
1211 | (priv:date-printer date 0 fmt-str (string-length fmt-str) str-port) | |
1212 | (get-output-string str-port))) | |
1213 | ||
1214 | (define (priv:char->int ch) | |
1215 | (case ch | |
1216 | ((#\0) 0) | |
1217 | ((#\1) 1) | |
1218 | ((#\2) 2) | |
1219 | ((#\3) 3) | |
1220 | ((#\4) 4) | |
1221 | ((#\5) 5) | |
1222 | ((#\6) 6) | |
1223 | ((#\7) 7) | |
1224 | ((#\8) 8) | |
1225 | ((#\9) 9) | |
1226 | (else (priv:time-error 'bad-date-template-string | |
1227 | (list "Non-integer character" ch i))))) | |
1228 | ||
1229 | ;; read an integer upto n characters long on port; upto -> #f is any length | |
1230 | (define (priv:integer-reader upto port) | |
1231 | (let loop ((accum 0) (nchars 0)) | |
1232 | (let ((ch (peek-char port))) | |
1233 | (if (or (eof-object? ch) | |
1234 | (not (char-numeric? ch)) | |
1235 | (and upto (>= nchars upto))) | |
1236 | accum | |
1237 | (loop port | |
1238 | (+ (* accum 10) (priv:char->int (read-char port))) | |
1239 | (+ nchars 1)))))) | |
1240 | ||
1241 | (define (priv:make-integer-reader upto) | |
1242 | (lambda (port) | |
1243 | (priv:integer-reader upto port))) | |
1244 | ||
1245 | ;; read *exactly* n characters and convert to integer; could be padded | |
1246 | (define (priv:integer-reader-exact n port) | |
1247 | (let ((padding-ok #t)) | |
1248 | (define (accum-int port accum nchars) | |
1249 | (let ((ch (peek-char port))) | |
5a1920de RB |
1250 | (cond |
1251 | ((>= nchars n) accum) | |
1252 | ((eof-object? ch) | |
1253 | (priv:time-error 'string->date 'bad-date-template-string | |
5bbfe8cb | 1254 | "Premature ending to integer read.")) |
5a1920de RB |
1255 | ((char-numeric? ch) |
1256 | (set! padding-ok #f) | |
1257 | (accum-int port | |
1258 | (+ (* accum 10) (priv:char->int (read-char port))) | |
1259 | (+ nchars 1))) | |
1260 | (padding-ok | |
1261 | (read-char port) ; consume padding | |
1262 | (accum-int port accum (+ nchars 1))) | |
1263 | (else ; padding where it shouldn't be | |
1264 | (priv:time-error 'string->date 'bad-date-template-string | |
5bbfe8cb RB |
1265 | "Non-numeric characters in integer read."))))) |
1266 | (accum-int port 0 0))) | |
1267 | ||
1268 | ||
1269 | (define (priv:make-integer-exact-reader n) | |
1270 | (lambda (port) | |
1271 | (priv:integer-reader-exact n port))) | |
1272 | ||
1273 | (define (priv:zone-reader port) | |
1274 | (let ((offset 0) | |
1275 | (positive? #f)) | |
1276 | (let ((ch (read-char port))) | |
1277 | (if (eof-object? ch) | |
1278 | (priv:time-error 'string->date 'bad-date-template-string | |
1279 | (list "Invalid time zone +/-" ch))) | |
1280 | (if (or (char=? ch #\Z) (char=? ch #\z)) | |
1281 | 0 | |
1282 | (begin | |
1283 | (cond | |
1284 | ((char=? ch #\+) (set! positive? #t)) | |
1285 | ((char=? ch #\-) (set! positive? #f)) | |
1286 | (else | |
1287 | (priv:time-error 'string->date 'bad-date-template-string | |
1288 | (list "Invalid time zone +/-" ch)))) | |
1289 | (let ((ch (read-char port))) | |
1290 | (if (eof-object? ch) | |
1291 | (priv:time-error 'string->date 'bad-date-template-string | |
1292 | (list "Invalid time zone number" ch))) | |
1293 | (set! offset (* (priv:char->int ch) | |
1294 | 10 60 60))) | |
1295 | (let ((ch (read-char port))) | |
1296 | (if (eof-object? ch) | |
1297 | (priv:time-error 'string->date 'bad-date-template-string | |
1298 | (list "Invalid time zone number" ch))) | |
1299 | (set! offset (+ offset (* (priv:char->int ch) | |
1300 | 60 60)))) | |
1301 | (let ((ch (read-char port))) | |
1302 | (if (eof-object? ch) | |
1303 | (priv:time-error 'string->date 'bad-date-template-string | |
1304 | (list "Invalid time zone number" ch))) | |
1305 | (set! offset (+ offset (* (priv:char->int ch) | |
1306 | 10 60)))) | |
1307 | (let ((ch (read-char port))) | |
1308 | (if (eof-object? ch) | |
1309 | (priv:time-error 'string->date 'bad-date-template-string | |
1310 | (list "Invalid time zone number" ch))) | |
1311 | (set! offset (+ offset (* (priv:char->int ch) | |
1312 | 60)))) | |
1313 | (if positive? offset (- offset))))))) | |
1314 | ||
1315 | ;; looking at a char, read the char string, run thru indexer, return index | |
1316 | (define (priv:locale-reader port indexer) | |
1317 | (let ((string-port (open-output-string))) | |
1318 | (define (read-char-string) | |
1319 | (let ((ch (peek-char port))) | |
1320 | (if (char-alphabetic? ch) | |
1321 | (begin (write-char (read-char port) string-port) | |
1322 | (read-char-string)) | |
1323 | (get-output-string string-port)))) | |
1324 | (let* ((str (read-char-string)) | |
1325 | (index (indexer str))) | |
1326 | (if index index (priv:time-error 'string->date | |
1327 | 'bad-date-template-string | |
1328 | (list "Invalid string for " indexer)))))) | |
1329 | ||
1330 | (define (priv:make-locale-reader indexer) | |
1331 | (lambda (port) | |
1332 | (priv:locale-reader port indexer))) | |
1333 | ||
1334 | (define (priv:make-char-id-reader char) | |
1335 | (lambda (port) | |
1336 | (if (char=? char (read-char port)) | |
1337 | char | |
1338 | (priv:time-error 'string->date | |
1339 | 'bad-date-template-string | |
1340 | "Invalid character match.")))) | |
1341 | ||
1342 | ;; A List of formatted read directives. | |
1343 | ;; Each entry is a list. | |
1344 | ;; 1. the character directive; | |
1345 | ;; a procedure, which takes a character as input & returns | |
1346 | ;; 2. #t as soon as a character on the input port is acceptable | |
1347 | ;; for input, | |
1348 | ;; 3. a port reader procedure that knows how to read the current port | |
1349 | ;; for a value. Its one parameter is the port. | |
1350 | ;; 4. a action procedure, that takes the value (from 3.) and some | |
1351 | ;; object (here, always the date) and (probably) side-effects it. | |
1352 | ;; In some cases (e.g., ~A) the action is to do nothing | |
1353 | ||
1354 | (define priv:read-directives | |
1355 | (let ((ireader4 (priv:make-integer-reader 4)) | |
1356 | (ireader2 (priv:make-integer-reader 2)) | |
1357 | (ireaderf (priv:make-integer-reader #f)) | |
1358 | (eireader2 (priv:make-integer-exact-reader 2)) | |
1359 | (eireader4 (priv:make-integer-exact-reader 4)) | |
1360 | (locale-reader-abbr-weekday (priv:make-locale-reader | |
1361 | priv:locale-abbr-weekday->index)) | |
1362 | (locale-reader-long-weekday (priv:make-locale-reader | |
1363 | priv:locale-long-weekday->index)) | |
1364 | (locale-reader-abbr-month (priv:make-locale-reader | |
1365 | priv:locale-abbr-month->index)) | |
1366 | (locale-reader-long-month (priv:make-locale-reader | |
1367 | priv:locale-long-month->index)) | |
1368 | (char-fail (lambda (ch) #t)) | |
1369 | (do-nothing (lambda (val object) (values)))) | |
1370 | ||
1371 | (list | |
1372 | (list #\~ char-fail (priv:make-char-id-reader #\~) do-nothing) | |
1373 | (list #\a char-alphabetic? locale-reader-abbr-weekday do-nothing) | |
1374 | (list #\A char-alphabetic? locale-reader-long-weekday do-nothing) | |
1375 | (list #\b char-alphabetic? locale-reader-abbr-month | |
1376 | (lambda (val object) | |
1377 | (priv:set-date-month! object val))) | |
1378 | (list #\B char-alphabetic? locale-reader-long-month | |
1379 | (lambda (val object) | |
1380 | (priv:set-date-month! object val))) | |
1381 | (list #\d char-numeric? ireader2 (lambda (val object) | |
1382 | (priv:set-date-day! | |
1383 | object val))) | |
1384 | (list #\e char-fail eireader2 (lambda (val object) | |
1385 | (priv:set-date-day! object val))) | |
1386 | (list #\h char-alphabetic? locale-reader-abbr-month | |
1387 | (lambda (val object) | |
1388 | (priv:set-date-month! object val))) | |
1389 | (list #\H char-numeric? ireader2 (lambda (val object) | |
1390 | (priv:set-date-hour! object val))) | |
1391 | (list #\k char-fail eireader2 (lambda (val object) | |
1392 | (priv:set-date-hour! object val))) | |
1393 | (list #\m char-numeric? ireader2 (lambda (val object) | |
1394 | (priv:set-date-month! object val))) | |
1395 | (list #\M char-numeric? ireader2 (lambda (val object) | |
1396 | (priv:set-date-minute! | |
1397 | object val))) | |
1398 | (list #\S char-numeric? ireader2 (lambda (val object) | |
1399 | (priv:set-date-second! object val))) | |
1400 | (list #\y char-fail eireader2 | |
1401 | (lambda (val object) | |
1402 | (priv:set-date-year! object (priv:natural-year val)))) | |
1403 | (list #\Y char-numeric? ireader4 (lambda (val object) | |
1404 | (priv:set-date-year! object val))) | |
1405 | (list #\z (lambda (c) | |
1406 | (or (char=? c #\Z) | |
1407 | (char=? c #\z) | |
1408 | (char=? c #\+) | |
1409 | (char=? c #\-))) | |
1410 | priv:zone-reader (lambda (val object) | |
1411 | (priv:set-date-zone-offset! object val)))))) | |
1412 | ||
1413 | (define (priv:string->date date index format-string str-len port template-string) | |
1414 | (define (skip-until port skipper) | |
1415 | (let ((ch (peek-char port))) | |
1416 | (if (eof-object? port) | |
1417 | (priv:time-error 'string->date 'bad-date-format-string template-string) | |
1418 | (if (not (skipper ch)) | |
1419 | (begin (read-char port) (skip-until port skipper)))))) | |
1420 | (if (>= index str-len) | |
1421 | (begin | |
1422 | (values)) | |
1423 | (let ((current-char (string-ref format-string index))) | |
1424 | (if (not (char=? current-char #\~)) | |
1425 | (let ((port-char (read-char port))) | |
1426 | (if (or (eof-object? port-char) | |
1427 | (not (char=? current-char port-char))) | |
1428 | (priv:time-error 'string->date | |
1429 | 'bad-date-format-string template-string)) | |
1430 | (priv:string->date date | |
1431 | (+ index 1) | |
1432 | format-string | |
1433 | str-len | |
1434 | port | |
1435 | template-string)) | |
1436 | ;; otherwise, it's an escape, we hope | |
1437 | (if (> (+ index 1) str-len) | |
1438 | (priv:time-error 'string->date | |
1439 | 'bad-date-format-string template-string) | |
1440 | (let* ((format-char (string-ref format-string (+ index 1))) | |
1441 | (format-info (assoc format-char priv:read-directives))) | |
1442 | (if (not format-info) | |
1443 | (priv:time-error 'string->date | |
1444 | 'bad-date-format-string template-string) | |
1445 | (begin | |
1446 | (let ((skipper (cadr format-info)) | |
1447 | (reader (caddr format-info)) | |
1448 | (actor (cadddr format-info))) | |
1449 | (skip-until port skipper) | |
1450 | (let ((val (reader port))) | |
1451 | (if (eof-object? val) | |
1452 | (priv:time-error 'string->date | |
1453 | 'bad-date-format-string | |
1454 | template-string) | |
1455 | (actor val date))) | |
1456 | (priv:string->date date | |
1457 | (+ index 2) | |
1458 | format-string | |
1459 | str-len | |
1460 | port | |
1461 | template-string)))))))))) | |
1462 | ||
1463 | (define (string->date input-string template-string) | |
1464 | (define (priv:date-ok? date) | |
1465 | (and (date-nanosecond date) | |
1466 | (date-second date) | |
1467 | (date-minute date) | |
1468 | (date-hour date) | |
1469 | (date-day date) | |
1470 | (date-month date) | |
1471 | (date-year date) | |
1472 | (date-zone-offset date))) | |
1473 | (let ((newdate (make-date 0 0 0 0 #f #f #f (priv:local-tz-offset)))) | |
1474 | (priv:string->date newdate | |
1475 | 0 | |
1476 | template-string | |
1477 | (string-length template-string) | |
1478 | (open-input-string input-string) | |
1479 | template-string) | |
1480 | (if (priv:date-ok? newdate) | |
1481 | newdate | |
1482 | (priv:time-error | |
1483 | 'string->date | |
1484 | 'bad-date-format-string | |
1485 | (list "Incomplete date read. " newdate template-string))))) |