1425 lines
52 KiB
Scheme
1425 lines
52 KiB
Scheme
;; SRFI-19: Time Data Types and Procedures.
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;;
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;; Copyright (C) I/NET, Inc. (2000, 2002). All Rights Reserved.
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;;
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;; This document and translations of it may be copied and furnished to others,
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;; and derivative works that comment on or otherwise explain it or assist in its
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;; implementation may be prepared, copied, published and distributed, in whole or
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;; in part, without restriction of any kind, provided that the above copyright
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;; notice and this paragraph are included on all such copies and derivative works.
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;; However, this document itself may not be modified in any way, such as by
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;; removing the copyright notice or references to the Scheme Request For
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;; Implementation process or editors, except as needed for the purpose of
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;; developing SRFIs in which case the procedures for copyrights defined in the SRFI
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;; process must be followed, or as required to translate it into languages other
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;; than English.
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;;
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;; The limited permissions granted above are perpetual and will not be revoked
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;; by the authors or their successors or assigns.
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;;
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;; This document and the information contained herein is provided on an "AS IS"
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;; basis and THE AUTHOR AND THE SRFI EDITORS DISCLAIM ALL WARRANTIES, EXPRESS OR
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;; IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE
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;; INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
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;; MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
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(define-syntax :optional
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(syntax-rules ()
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((_ val default-value)
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(if (null? val) default-value (car val)))))
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(define time-tai 'time-tai)
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(define time-utc 'time-utc)
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(define time-monotonic 'time-monotonic)
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(define time-thread 'time-thread)
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(define time-process 'time-process)
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(define time-duration 'time-duration)
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;;-- LOCALE dependent constants
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(define tm:locale-number-separator ".")
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(define tm:locale-abbr-weekday-vector (vector "Sun" "Mon" "Tue" "Wed"
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"Thu" "Fri" "Sat"))
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(define tm:locale-long-weekday-vector (vector "Sunday" "Monday"
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"Tuesday" "Wednesday"
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"Thursday" "Friday"
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"Saturday"))
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;; note empty string in 0th place.
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(define tm:locale-abbr-month-vector (vector "" "Jan" "Feb" "Mar"
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"Apr" "May" "Jun" "Jul"
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"Aug" "Sep" "Oct" "Nov"
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"Dec"))
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(define tm:locale-long-month-vector (vector "" "January" "February"
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"March" "April" "May"
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"June" "July" "August"
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"September" "October"
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"November" "December"))
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(define tm:locale-pm "PM")
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(define tm:locale-am "AM")
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;; See date->string
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(define tm:locale-date-time-format "~a ~b ~d ~H:~M:~S~z ~Y")
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(define tm:locale-short-date-format "~m/~d/~y")
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(define tm:locale-time-format "~H:~M:~S")
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(define tm:iso-8601-date-time-format "~Y-~m-~dT~H:~M:~S~z")
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;;-- Miscellaneous Constants.
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;;-- only the tm:tai-epoch-in-jd might need changing if
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;; a different epoch is used.
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(define tm:nano (expt 10 9))
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(define tm:sid 86400) ; seconds in a day
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(define tm:sihd 43200) ; seconds in a half day
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(define tm:tai-epoch-in-jd 4881175/2) ; julian day number for 'the epoch'
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;; SCSH portability
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(define tm:ns/quantum (/ tm:nano (ticks/sec)))
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;;; A Very simple Error system for the time procedures
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;;;
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(define tm:time-error-types
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'(invalid-clock-type
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unsupported-clock-type
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incompatible-time-types
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not-duration
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dates-are-immutable
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bad-date-format-string
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bad-date-template-string
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invalid-month-specification
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))
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(define (tm:time-error caller type value)
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(if (member type tm:time-error-types)
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(if value
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;; SCSH portability
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(error caller (format #f "TIME-ERROR type ~S: ~S" type value))
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(error caller (format #f "TIME-ERROR type ~S" type)))
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(error caller (format #f "TIME-ERROR unsupported error type ~S" type))))
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;; A table of leap seconds
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;; See ftp://maia.usno.navy.mil/ser7/tai-utc.dat
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;; and update as necessary.
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;; this procedures reads the file in the abover
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;; format and creates the leap second table
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;; it also calls the almost standard, but not R5 procedures read-line
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;; & open-input-string
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;; ie (set! tm:leap-second-table (tm:read-tai-utc-date "tai-utc.dat"))
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(define (tm:read-tai-utc-data filename)
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(define (convert-jd jd)
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(* (- (inexact->exact jd) tm:tai-epoch-in-jd) tm:sid))
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(define (convert-sec sec)
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(inexact->exact sec))
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(let ( (port (open-input-file filename))
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(table '()) )
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(let loop ((line (read-line port)))
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(if (not (eof-object? line))
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(begin
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(let* ( (data (read (open-input-string (string-append "(" line ")"))))
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(year (car data))
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(jd (cadddr (cdr data)))
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(secs (cadddr (cdddr data))) )
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(if (>= year 1972)
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(set! table (cons (cons (convert-jd jd) (convert-sec secs)) table)))
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(loop (read-line port))))))
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table))
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;; each entry is (tai seconds since epoch . # seconds to subtract for utc)
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;; note they go higher to lower, and end in 1972.
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(define tm:leap-second-table
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'((915148800 . 32)
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(867715200 . 31)
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(820454400 . 30)
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(773020800 . 29)
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(741484800 . 28)
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(709948800 . 27)
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(662688000 . 26)
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(631152000 . 25)
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(567993600 . 24)
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(489024000 . 23)
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(425865600 . 22)
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(394329600 . 21)
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(362793600 . 20)
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(315532800 . 19)
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(283996800 . 18)
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(252460800 . 17)
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(220924800 . 16)
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(189302400 . 15)
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(157766400 . 14)
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(126230400 . 13)
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(94694400 . 12)
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(78796800 . 11)
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(63072000 . 10)))
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(define (read-leap-second-table filename)
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(set! tm:leap-second-table (tm:read-tai-utc-data filename))
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(values))
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(define (tm:leap-second-delta utc-seconds)
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(letrec ((lsd (lambda (table)
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(cond ((>= utc-seconds (caar table))
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(cdar table))
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(else (lsd (cdr table)))))))
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(if (< utc-seconds (* (- 1972 1970) 365 tm:sid)) 0
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(lsd tm:leap-second-table))))
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;;; the TIME structure; creates the accessors, too.
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;;; wf: changed to match SRFI documentation
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(define-record-type :time
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(make-time-unnormalized type nanosecond second)
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time?
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(type time-type set-time-type!)
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(nanosecond time-nanosecond set-time-nanosecond!)
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(second time-second set-time-second!))
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(define (copy-time time)
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(make-time (time-type time) (time-nanosecond time) (time-second time)))
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(define (tm:split-real r)
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(if (integer? r)
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(values (inexact->exact r) 0)
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(let ((l (truncate r)))
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(values (inexact->exact l) (- r l)))))
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(define (tm:time-normalize! t)
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(if (>= (abs (time-nanosecond t)) 1000000000)
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(receive (int frac)
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(tm:split-real (time-nanosecond t))
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(set-time-second! t (+ (time-second t)
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(quotient int 1000000000)))
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(set-time-nanosecond! t (+ (remainder int 1000000000)
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frac))))
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(if (and (positive? (time-second t))
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(negative? (time-nanosecond t)))
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(begin
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(set-time-second! t (- (time-second t) 1))
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(set-time-nanosecond! t (+ 1000000000 (time-nanosecond t))))
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(if (and (negative? (time-second t))
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(positive? (time-nanosecond t)))
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(begin
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(set-time-second! t (+ (time-second t) 1))
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(set-time-nanosecond! t (+ 1000000000 (time-nanosecond t))))))
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t)
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(define (make-time type nanosecond second)
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(tm:time-normalize! (make-time-unnormalized type nanosecond second)))
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;; Helpers
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;; FIXME: finish this and publish it?
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'(define (date->broken-down-time date)
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(let ((result (mktime 0)))
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;; FIXME: What should we do about leap-seconds which may overflow
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;; set-tm:sec?
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(set-tm:sec result (date-second date))
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(set-tm:min result (date-minute date))
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(set-tm:hour result (date-hour date))
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;; FIXME: SRFI day ranges from 0-31. (not compatible with set-tm:mday).
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(set-tm:mday result (date-day date))
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(set-tm:month result (- (date-month date) 1))
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;; FIXME: need to signal error on range violation.
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(set-tm:year result (+ 1900 (date-year date)))
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(set-tm:isdst result -1)
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(set-tm:gmtoff result (- (date-zone-offset date)))
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result))
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;;; current-time
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;;; specific time getters.
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;;; These should be rewritten to be OS specific.
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;;
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;; -- using GNU gettimeofday() would be useful here -- gets
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;; second + millisecond
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;; let's pretend we do, using MzScheme's current-seconds & current-milliseconds
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;; this is supposed to return UTC.
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;;
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'(define (tm:get-time-of-day)
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(values (current-seconds)
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(abs (remainder (current-milliseconds) 1000))))
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;; SCSH portability
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(define (tm:current-time-utc)
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(receive (seconds quanta) (time+ticks)
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(make-time time-utc
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(* quanta tm:ns/quantum)
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seconds)))
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;; SCSH portability
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(define (tm:current-time-tai)
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(receive (seconds quanta) (time+ticks)
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(make-time time-tai
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(* quanta tm:ns/quantum)
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(+ seconds (tm:leap-second-delta seconds)))))
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(define (tm:current-time-ms-time time-type proc)
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(let ((current-ms (proc)))
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(make-time time-type
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(* (remainder current-ms 1000) tm:ns/quantum)
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(quotient current-ms 1000)
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)))
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;; -- we define it to be the same as TAI.
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;; A different implemation of current-time-montonic
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;; will require rewriting all of the time-monotonic converters,
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;; of course.
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;; SCSH portability
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(define (tm:current-time-monotonic)
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(receive (seconds quanta) (time+ticks)
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(make-time time-tai
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(* quanta tm:ns/quantum)
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(+ seconds (tm:leap-second-delta seconds)))))
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(define (tm:current-time-thread)
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(tm:time-error 'current-time 'unsupported-clock-type 'time-thread))
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;; SCSH portability
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(define (tm:current-time-process)
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(let ((ticks/s (cpu-ticks/sec)))
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(receive (userticks systicks childuserticks childsysticks) (process-times)
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(make-time time-process
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(* (remainder userticks ticks/s) (/ tm:nano ticks/s))
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(quotient userticks ticks/s)))))
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;; SCSH portability
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(define (tm:current-time-gc)
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(tm:time-error 'current-time 'unsupported-clock-type 'time-gc))
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(define (current-time . clock-type)
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(let ( (clock-type (:optional clock-type time-utc)) )
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(cond
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((eq? clock-type time-tai) (tm:current-time-tai))
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((eq? clock-type time-utc) (tm:current-time-utc))
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((eq? clock-type time-monotonic) (tm:current-time-monotonic))
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((eq? clock-type time-thread) (tm:current-time-thread))
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((eq? clock-type time-process) (tm:current-time-process))
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;; ((eq? clock-type time-gc) (tm:current-time-gc))
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(else (tm:time-error 'current-time 'invalid-clock-type clock-type)))))
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;; -- Time Resolution
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;; This is the resolution of the clock in nanoseconds.
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;; This will be implementation specific.
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(define (time-resolution . clock-type)
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(let ((clock-type (:optional clock-type time-utc)))
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(cond
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((eq? clock-type time-tai) tm:ns/quantum)
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((eq? clock-type time-utc) tm:ns/quantum)
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((eq? clock-type time-monotonic) tm:ns/quantum)
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((eq? clock-type time-thread) tm:ns/quantum)
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;; SCSH portability
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((eq? clock-type time-process) (/ tm:nano (cpu-ticks/sec)))
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;;((eq? clock-type time-gc) tm:ns/quantum)
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(else (tm:time-error 'time-resolution 'invalid-clock-type clock-type)))))
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;; -- Time comparisons
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(define (time=? t1 t2)
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;; Arrange tests for speed and presume that t1 and t2 are actually times.
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;; also presume it will be rare to check two times of different types.
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(and (= (time-second t1) (time-second t2))
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(= (time-nanosecond t1) (time-nanosecond t2))
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(eq? (time-type t1) (time-type t2))))
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(define (time>? t1 t2)
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(or (> (time-second t1) (time-second t2))
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(and (= (time-second t1) (time-second t2))
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(> (time-nanosecond t1) (time-nanosecond t2)))))
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(define (time<? t1 t2)
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(or (< (time-second t1) (time-second t2))
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(and (= (time-second t1) (time-second t2))
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(< (time-nanosecond t1) (time-nanosecond t2)))))
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(define (time>=? t1 t2)
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(or (> (time-second t1) (time-second t2))
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(and (= (time-second t1) (time-second t2))
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(>= (time-nanosecond t1) (time-nanosecond t2)))))
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(define (time<=? t1 t2)
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(or (< (time-second t1) (time-second t2))
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(and (= (time-second t1) (time-second t2))
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(<= (time-nanosecond t1) (time-nanosecond t2)))))
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;; -- Time arithmetic
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(define (time-difference! time1 time2)
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(let ((sec-diff (- (time-second time1) (time-second time2)))
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(nsec-diff (- (time-nanosecond time1) (time-nanosecond time2))))
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(set-time-type! time1 time-duration)
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(set-time-second! time1 sec-diff)
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(set-time-nanosecond! time1 nsec-diff)
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(tm:time-normalize! time1)))
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(define (time-difference time1 time2)
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(let ((result (copy-time time1)))
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(time-difference! result time2)))
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(define (add-duration! t duration)
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(if (not (eq? (time-type duration) time-duration))
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(tm:time-error 'add-duration 'not-duration duration)
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(let ((sec-plus (+ (time-second t) (time-second duration)))
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(nsec-plus (+ (time-nanosecond t) (time-nanosecond duration))))
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(set-time-second! t sec-plus)
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(set-time-nanosecond! t nsec-plus)
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(tm:time-normalize! t))))
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(define (add-duration t duration)
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(let ((result (copy-time t)))
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(add-duration! result duration)))
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(define (subtract-duration! t duration)
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(if (not (eq? (time-type duration) time-duration))
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(tm:time-error 'add-duration 'not-duration duration)
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(let ((sec-minus (- (time-second t) (time-second duration)))
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(nsec-minus (- (time-nanosecond t) (time-nanosecond duration))))
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(set-time-second! t sec-minus)
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(set-time-nanosecond! t nsec-minus)
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(tm:time-normalize! t))))
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(define (subtract-duration time1 duration)
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(let ((result (copy-time time1)))
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(subtract-duration! result duration)))
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;; -- Converters between types.
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(define (tm:time-tai->time-utc! time-in time-out caller)
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(if (not (eq? (time-type time-in) time-tai))
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(tm:time-error caller 'incompatible-time-types time-in))
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(set-time-type! time-out time-utc)
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(set-time-nanosecond! time-out (time-nanosecond time-in))
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(set-time-second! time-out (- (time-second time-in)
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(tm:leap-second-delta
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(time-second time-in))))
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time-out)
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(define (time-tai->time-utc time-in)
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(tm:time-tai->time-utc! time-in (make-time-unnormalized #f #f #f) 'time-tai->time-utc))
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(define (time-tai->time-utc! time-in)
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(tm:time-tai->time-utc! time-in time-in 'time-tai->time-utc!))
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(define (tm:time-utc->time-tai! time-in time-out caller)
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(if (not (eq? (time-type time-in) time-utc))
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(tm:time-error caller 'incompatible-time-types time-in))
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(set-time-type! time-out time-tai)
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(set-time-nanosecond! time-out (time-nanosecond time-in))
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(set-time-second! time-out (+ (time-second time-in)
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(tm:leap-second-delta
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(time-second time-in))))
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time-out)
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(define (time-utc->time-tai time-in)
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(tm:time-utc->time-tai! time-in (make-time-unnormalized #f #f #f) 'time-utc->time-tai))
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(define (time-utc->time-tai! time-in)
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(tm:time-utc->time-tai! time-in time-in 'time-utc->time-tai!))
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;; -- these depend on time-monotonic having the same definition as time-tai!
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(define (time-monotonic->time-utc time-in)
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(if (not (eq? (time-type time-in) time-monotonic))
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(tm:time-error 'time-monotonic->time-utc 'incompatible-time-types time-in))
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(let ((ntime (copy-time time-in)))
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(set-time-type! ntime time-tai)
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(tm:time-tai->time-utc! ntime ntime 'time-monotonic->time-utc)))
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(define (time-monotonic->time-utc! time-in)
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(if (not (eq? (time-type time-in) time-monotonic))
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(tm:time-error 'time-monotonic->time-utc! 'incompatible-time-types time-in))
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(set-time-type! time-in time-tai)
|
|
(tm:time-tai->time-utc! time-in time-in 'time-monotonic->time-utc))
|
|
|
|
(define (time-monotonic->time-tai time-in)
|
|
(if (not (eq? (time-type time-in) time-monotonic))
|
|
(tm:time-error 'time-monotonic->time-tai 'incompatible-time-types time-in))
|
|
(let ((ntime (copy-time time-in)))
|
|
(set-time-type! ntime time-tai)
|
|
ntime))
|
|
|
|
(define (time-monotonic->time-tai! time-in)
|
|
(if (not (eq? (time-type time-in) time-monotonic))
|
|
(tm:time-error 'time-monotonic->time-tai 'incompatible-time-types time-in))
|
|
(set-time-type! time-in time-tai)
|
|
time-in)
|
|
|
|
(define (time-utc->time-monotonic time-in)
|
|
(if (not (eq? (time-type time-in) time-utc))
|
|
(tm:time-error 'time-utc->time-monotonic 'incompatible-time-types time-in))
|
|
(let ((ntime (tm:time-utc->time-tai! time-in (make-time-unnormalized #f #f #f)
|
|
'time-utc->time-monotonic)))
|
|
(set-time-type! ntime time-monotonic)
|
|
ntime))
|
|
|
|
|
|
(define (time-utc->time-monotonic! time-in)
|
|
(if (not (eq? (time-type time-in) time-utc))
|
|
(tm:time-error 'time-utc->time-monotonic! 'incompatible-time-types time-in))
|
|
(let ((ntime (tm:time-utc->time-tai! time-in time-in
|
|
'time-utc->time-monotonic!)))
|
|
(set-time-type! ntime time-monotonic)
|
|
ntime))
|
|
|
|
|
|
(define (time-tai->time-monotonic time-in)
|
|
(if (not (eq? (time-type time-in) time-tai))
|
|
(tm:time-error 'time-tai->time-monotonic 'incompatible-time-types time-in))
|
|
(let ((ntime (copy-time time-in)))
|
|
(set-time-type! ntime time-monotonic)
|
|
ntime))
|
|
|
|
(define (time-tai->time-monotonic! time-in)
|
|
(if (not (eq? (time-type time-in) time-tai))
|
|
(tm:time-error 'time-tai->time-monotonic! 'incompatible-time-types time-in))
|
|
(set-time-type! time-in time-monotonic)
|
|
time-in)
|
|
|
|
|
|
;; -- Date Structures
|
|
|
|
;; SCSH portability
|
|
(define-record-type :date
|
|
(make-date nanosecond second minute
|
|
hour day month
|
|
year
|
|
zone-offset)
|
|
date?
|
|
(nanosecond date-nanosecond set-date-nanosecond!)
|
|
(second date-second set-date-second!)
|
|
(minute date-minute set-date-minute!)
|
|
(hour date-hour set-date-hour!)
|
|
(day date-day set-date-day!)
|
|
(month date-month set-date-month!)
|
|
(year date-year set-date-year!)
|
|
(zone-offset date-zone-offset set-date-zone-offset!))
|
|
|
|
;; gives the julian day which starts at noon.
|
|
(define (tm:encode-julian-day-number day month year)
|
|
(let* ((a (quotient (- 14 month) 12))
|
|
(y (- (- (+ year 4800) a) (if (negative? year) -1 0)))
|
|
(m (- (+ month (* 12 a)) 3)))
|
|
(+ day
|
|
(quotient (+ (* 153 m) 2) 5)
|
|
(* 365 y)
|
|
(quotient y 4)
|
|
(- (quotient y 100))
|
|
(quotient y 400)
|
|
-32045)))
|
|
|
|
;; gives the seconds/date/month/year
|
|
(define (tm:decode-julian-day-number jdn)
|
|
(let* ((days (truncate jdn))
|
|
(a (+ days 32044))
|
|
(b (quotient (+ (* 4 a) 3) 146097))
|
|
(c (- a (quotient (* 146097 b) 4)))
|
|
(d (quotient (+ (* 4 c) 3) 1461))
|
|
(e (- c (quotient (* 1461 d) 4)))
|
|
(m (quotient (+ (* 5 e) 2) 153))
|
|
(y (+ (* 100 b) d -4800 (quotient m 10))))
|
|
(values ; seconds date month year
|
|
(* (- jdn days) tm:sid)
|
|
(+ e (- (quotient (+ (* 153 m) 2) 5)) 1)
|
|
(+ m 3 (* -12 (quotient m 10)))
|
|
(if (>= 0 y) (- y 1) y))
|
|
))
|
|
|
|
|
|
;; relies on the fact that we named our time zone accessor
|
|
;; differently from MzScheme's....
|
|
;; This should be written to be OS specific.
|
|
|
|
(define (tm:local-tz-offset utc-time)
|
|
;; SCSH portability
|
|
(date:tz-secs (date)))
|
|
|
|
;; special thing -- ignores nanos
|
|
(define (tm:time->julian-day-number seconds tz-offset)
|
|
(+ (/ (+ seconds
|
|
tz-offset
|
|
tm:sihd)
|
|
tm:sid)
|
|
tm:tai-epoch-in-jd))
|
|
|
|
(define (tm:leap-second? second)
|
|
(and (assoc second tm:leap-second-table) #t))
|
|
|
|
(define (time-utc->date time . tz-offset)
|
|
(if (not (eq? (time-type time) time-utc))
|
|
(tm:time-error 'time->date 'incompatible-time-types time))
|
|
(let* ((offset (if (null? tz-offset)
|
|
(tm:local-tz-offset time)
|
|
(car tz-offset)))
|
|
(leap-second? (tm:leap-second? (+ offset (time-second time))))
|
|
(jdn (tm:time->julian-day-number (if leap-second?
|
|
(- (time-second time) 1)
|
|
(time-second time))
|
|
offset)))
|
|
|
|
(call-with-values (lambda () (tm:decode-julian-day-number jdn))
|
|
(lambda (secs date month year)
|
|
(let* ((hours (quotient secs (* 60 60)))
|
|
(rem (remainder secs (* 60 60)))
|
|
(minutes (quotient rem 60))
|
|
(seconds (remainder rem 60)))
|
|
(make-date (time-nanosecond time)
|
|
(if leap-second? (+ seconds 1) seconds)
|
|
minutes
|
|
hours
|
|
date
|
|
month
|
|
year
|
|
offset))))))
|
|
|
|
(define (time-tai->date time . tz-offset)
|
|
(if (not (eq? (time-type time) time-tai))
|
|
(tm:time-error 'time->date 'incompatible-time-types time))
|
|
(let* ((offset (if (null? tz-offset)
|
|
(tm:local-tz-offset (time-tai->time-utc time))
|
|
(car tz-offset)))
|
|
(seconds (- (time-second time)
|
|
(tm:leap-second-delta (time-second time))))
|
|
(leap-second? (tm:leap-second? (+ offset seconds)))
|
|
(jdn (tm:time->julian-day-number (if leap-second?
|
|
(- seconds 1)
|
|
seconds)
|
|
offset)))
|
|
(call-with-values (lambda () (tm:decode-julian-day-number jdn))
|
|
(lambda (secs date month year)
|
|
(let* ((hours (quotient secs (* 60 60)))
|
|
(rem (remainder secs (* 60 60)))
|
|
(minutes (quotient rem 60))
|
|
(seconds (remainder rem 60)))
|
|
(make-date (time-nanosecond time)
|
|
(if leap-second? (+ seconds 1) seconds)
|
|
minutes
|
|
hours
|
|
date
|
|
month
|
|
year
|
|
offset))))))
|
|
|
|
;; this is the same as time-tai->date.
|
|
(define (time-monotonic->date time . tz-offset)
|
|
(if (not (eq? (time-type time) time-monotonic))
|
|
(tm:time-error 'time->date 'incompatible-time-types time))
|
|
(let* ((offset (if (null? tz-offset)
|
|
(tm:local-tz-offset (time-monotonic->time-utc time))
|
|
(car tz-offset)))
|
|
(seconds (- (time-second time)
|
|
(tm:leap-second-delta (time-second time))))
|
|
(leap-second? (tm:leap-second? (+ offset seconds)))
|
|
(jdn (tm:time->julian-day-number (if leap-second?
|
|
(- seconds 1)
|
|
seconds)
|
|
offset)))
|
|
(call-with-values (lambda () (tm:decode-julian-day-number jdn))
|
|
(lambda (secs date month year)
|
|
(let* ((hours (quotient secs (* 60 60)))
|
|
(rem (remainder secs (* 60 60)))
|
|
(minutes (quotient rem 60))
|
|
(seconds (remainder rem 60)))
|
|
(make-date (time-nanosecond time)
|
|
(if leap-second? (+ seconds 1) seconds)
|
|
minutes
|
|
hours
|
|
date
|
|
month
|
|
year
|
|
offset))))))
|
|
|
|
(define (date->time-utc date)
|
|
(let* ((jdays (- (tm:encode-julian-day-number (date-day date)
|
|
(date-month date)
|
|
(date-year date))
|
|
tm:tai-epoch-in-jd))
|
|
;; jdays is an integer plus 1/2,
|
|
(jdays-1/2 (inexact->exact (- jdays 1/2))))
|
|
(make-time
|
|
time-utc
|
|
(date-nanosecond date)
|
|
(+ (* jdays-1/2 24 60 60)
|
|
(* (date-hour date) 60 60)
|
|
(* (date-minute date) 60)
|
|
(date-second date)
|
|
(- (date-zone-offset date))))))
|
|
|
|
(define (date->time-tai date)
|
|
(time-utc->time-tai! (date->time-utc date)))
|
|
|
|
(define (date->time-monotonic date)
|
|
(time-utc->time-monotonic! (date->time-utc date)))
|
|
|
|
|
|
(define (tm:leap-year? year)
|
|
(or (= (modulo year 400) 0)
|
|
(and (= (modulo year 4) 0) (not (= (modulo year 100) 0)))))
|
|
|
|
(define (leap-year? date)
|
|
(tm:leap-year? (date-year date)))
|
|
|
|
;; Map 1-based month number M to number of days in the year before the
|
|
;; start of month M (in a non-leap year).
|
|
(define tm:month-assoc '((1 . 0) (2 . 31) (3 . 59) (4 . 90)
|
|
(5 . 120) (6 . 151) (7 . 181) (8 . 212)
|
|
(9 . 243) (10 . 273) (11 . 304) (12 . 334)))
|
|
|
|
(define (tm:year-day day month year)
|
|
(let ((days-pr (assoc month tm:month-assoc)))
|
|
(if (not days-pr)
|
|
(tm:time-error 'date-year-day 'invalid-month-specification month))
|
|
(if (and (tm:leap-year? year) (> month 2))
|
|
(+ day (cdr days-pr) 1)
|
|
(+ day (cdr days-pr)))))
|
|
|
|
(define (date-year-day date)
|
|
(tm:year-day (date-day date) (date-month date) (date-year date)))
|
|
|
|
;; from calendar faq
|
|
(define (tm:week-day day month year)
|
|
(let* ((a (quotient (- 14 month) 12))
|
|
(y (- year a))
|
|
(m (+ month (* 12 a) -2)))
|
|
(modulo (+ day y (quotient y 4) (- (quotient y 100))
|
|
(quotient y 400) (quotient (* 31 m) 12))
|
|
7)))
|
|
|
|
(define (date-week-day date)
|
|
(tm:week-day (date-day date) (date-month date) (date-year date)))
|
|
|
|
(define (tm:days-before-first-week date day-of-week-starting-week)
|
|
(let* ((first-day (make-date 0 0 0 0
|
|
1
|
|
1
|
|
(date-year date)
|
|
#f))
|
|
(fdweek-day (date-week-day first-day)))
|
|
(modulo (- day-of-week-starting-week fdweek-day)
|
|
7)))
|
|
|
|
(define (date-week-number date day-of-week-starting-week)
|
|
(quotient (- (date-year-day date)
|
|
(tm:days-before-first-week date day-of-week-starting-week))
|
|
7))
|
|
|
|
(define (current-date . tz-offset)
|
|
(let ((time (current-time time-utc)))
|
|
(time-utc->date
|
|
time
|
|
(if (null? tz-offset)
|
|
(tm:local-tz-offset time)
|
|
(car tz-offset)))))
|
|
|
|
;; given a 'two digit' number, find the year within 50 years +/-
|
|
(define (tm:natural-year n)
|
|
(let* ((current-year (date-year (current-date)))
|
|
(current-century (* (quotient current-year 100) 100)))
|
|
(cond
|
|
((>= n 100) n)
|
|
((< n 0) n)
|
|
((<= (- (+ current-century n) current-year) 50)
|
|
(+ current-century n))
|
|
(else
|
|
(+ (- current-century 100) n)))))
|
|
|
|
(define (date->julian-day date)
|
|
(let ((nanosecond (date-nanosecond date))
|
|
(second (date-second date))
|
|
(minute (date-minute date))
|
|
(hour (date-hour date))
|
|
(day (date-day date))
|
|
(month (date-month date))
|
|
(year (date-year date)))
|
|
(+ (tm:encode-julian-day-number day month year)
|
|
(- 1/2)
|
|
(+ (/ (+ (* hour 60 60)
|
|
(* minute 60)
|
|
second
|
|
(/ nanosecond tm:nano))
|
|
tm:sid)))))
|
|
|
|
(define (date->modified-julian-day date)
|
|
(- (date->julian-day date)
|
|
4800001/2))
|
|
|
|
|
|
(define (time-utc->julian-day time)
|
|
(if (not (eq? (time-type time) time-utc))
|
|
(tm:time-error 'time->date 'incompatible-time-types time))
|
|
(+ (/ (+ (time-second time) (/ (time-nanosecond time) tm:nano))
|
|
tm:sid)
|
|
tm:tai-epoch-in-jd))
|
|
|
|
(define (time-utc->modified-julian-day time)
|
|
(- (time-utc->julian-day time)
|
|
4800001/2))
|
|
|
|
(define (time-tai->julian-day time)
|
|
(if (not (eq? (time-type time) time-tai))
|
|
(tm:time-error 'time->date 'incompatible-time-types time))
|
|
(+ (/ (+ (- (time-second time)
|
|
(tm:leap-second-delta (time-second time)))
|
|
(/ (time-nanosecond time) tm:nano))
|
|
tm:sid)
|
|
tm:tai-epoch-in-jd))
|
|
|
|
(define (time-tai->modified-julian-day time)
|
|
(- (time-tai->julian-day time)
|
|
4800001/2))
|
|
|
|
;; this is the same as time-tai->julian-day
|
|
(define (time-monotonic->julian-day time)
|
|
(if (not (eq? (time-type time) time-monotonic))
|
|
(tm:time-error 'time->date 'incompatible-time-types time))
|
|
(+ (/ (+ (- (time-second time)
|
|
(tm:leap-second-delta (time-second time)))
|
|
(/ (time-nanosecond time) tm:nano))
|
|
tm:sid)
|
|
tm:tai-epoch-in-jd))
|
|
|
|
|
|
(define (time-monotonic->modified-julian-day time)
|
|
(- (time-monotonic->julian-day time)
|
|
4800001/2))
|
|
|
|
|
|
(define (julian-day->time-utc jdn)
|
|
(let ((secs (* tm:sid (- jdn tm:tai-epoch-in-jd))))
|
|
(receive (seconds parts)
|
|
(tm:split-real secs)
|
|
(make-time time-utc
|
|
(* parts tm:nano)
|
|
seconds))))
|
|
|
|
(define (julian-day->time-tai jdn)
|
|
(time-utc->time-tai! (julian-day->time-utc jdn)))
|
|
|
|
(define (julian-day->time-monotonic jdn)
|
|
(time-utc->time-monotonic! (julian-day->time-utc jdn)))
|
|
|
|
(define (julian-day->date jdn . tz-offset)
|
|
(let* ((time (julian-day->time-utc jdn))
|
|
(offset (:optional tz-offset (tm:local-tz-offset time)))
|
|
(time-utc->date time offset)))
|
|
|
|
(define (modified-julian-day->date jdn . tz-offset)
|
|
(let ((offset (:optional tz-offset (tm:local-tz-offset))))
|
|
(julian-day->date (+ jdn 4800001/2) offset)))
|
|
|
|
(define (modified-julian-day->time-utc jdn)
|
|
(julian-day->time-utc (+ jdn 4800001/2)))
|
|
|
|
(define (modified-julian-day->time-tai jdn)
|
|
(julian-day->time-tai (+ jdn 4800001/2)))
|
|
|
|
(define (modified-julian-day->time-monotonic jdn)
|
|
(julian-day->time-monotonic (+ jdn 4800001/2)))
|
|
|
|
(define (current-julian-day)
|
|
(time-utc->julian-day (current-time time-utc)))
|
|
|
|
(define (current-modified-julian-day)
|
|
(time-utc->modified-julian-day (current-time time-utc)))
|
|
|
|
;; returns a string rep. of number N, of minimum LENGTH, padded with
|
|
;; character PAD-WITH. If PAD-WITH is #f, no padding is done, and it's
|
|
;; as if number->string was used. if string is longer than or equal
|
|
;; in length to LENGTH, it's as if number->string was used.
|
|
|
|
(define (tm:padding n pad-with length)
|
|
(let* ((str (number->string n))
|
|
(str-len (string-length str)))
|
|
(if (or (>= str-len length)
|
|
(not pad-with))
|
|
str
|
|
(string-append (make-string (- length str-len) pad-with) str))))
|
|
|
|
(define (tm:last-n-digits i n)
|
|
(abs (remainder i (expt 10 n))))
|
|
|
|
(define (tm:locale-abbr-weekday n)
|
|
(vector-ref tm:locale-abbr-weekday-vector n))
|
|
|
|
(define (tm:locale-long-weekday n)
|
|
(vector-ref tm:locale-long-weekday-vector n))
|
|
|
|
(define (tm:locale-abbr-month n)
|
|
(vector-ref tm:locale-abbr-month-vector n))
|
|
|
|
(define (tm:locale-long-month n)
|
|
(vector-ref tm:locale-long-month-vector n))
|
|
|
|
(define (tm:vector-find needle haystack comparator)
|
|
(let ((len (vector-length haystack)))
|
|
(define (tm:vector-find-int index)
|
|
(cond
|
|
((>= index len) #f)
|
|
((comparator needle (vector-ref haystack index)) index)
|
|
(else (tm:vector-find-int (+ index 1)))))
|
|
(tm:vector-find-int 0)))
|
|
|
|
(define (tm:locale-abbr-weekday->index string)
|
|
(tm:vector-find string tm:locale-abbr-weekday-vector string=?))
|
|
|
|
(define (tm:locale-long-weekday->index string)
|
|
(tm:vector-find string tm:locale-long-weekday-vector string=?))
|
|
|
|
(define (tm:locale-abbr-month->index string)
|
|
(tm:vector-find string tm:locale-abbr-month-vector string=?))
|
|
|
|
(define (tm:locale-long-month->index string)
|
|
(tm:vector-find string tm:locale-long-month-vector string=?))
|
|
|
|
|
|
;; FIXME: mkoeppe: Put a symbolic time zone in the date structs.
|
|
;; Print it here instead of the numerical offset if available.
|
|
(define (tm:locale-print-time-zone date port)
|
|
(tm:tz-printer (date-zone-offset date) port))
|
|
|
|
;; FIXME: we should use strftime to determine this dynamically if possible.
|
|
;; Again, locale specific.
|
|
(define (tm:locale-am/pm hr)
|
|
(if (> hr 11) tm:locale-pm tm:locale-am))
|
|
|
|
(define (tm:tz-printer offset port)
|
|
(cond
|
|
((= offset 0) (display "Z" port))
|
|
((negative? offset) (display "-" port))
|
|
(else (display "+" port)))
|
|
(if (not (= offset 0))
|
|
(let ( (hours (abs (quotient offset (* 60 60))))
|
|
(minutes (abs (quotient (remainder offset (* 60 60)) 60))) )
|
|
(display (tm:padding hours #\0 2) port)
|
|
(display (tm:padding minutes #\0 2) port))))
|
|
|
|
;; SCSH portability
|
|
(define char-tab (ascii->char 9))
|
|
|
|
;; A table of output formatting directives.
|
|
;; the first time is the format char.
|
|
;; the second is a procedure that takes the date, a padding character
|
|
;; (which might be #f), and the output port.
|
|
;;
|
|
(define tm:directives
|
|
(list
|
|
(cons #\~ (lambda (date pad-with port) (display #\~ port)))
|
|
|
|
(cons #\a (lambda (date pad-with port)
|
|
(display (tm:locale-abbr-weekday (date-week-day date))
|
|
port)))
|
|
(cons #\A (lambda (date pad-with port)
|
|
(display (tm:locale-long-weekday (date-week-day date))
|
|
port)))
|
|
(cons #\b (lambda (date pad-with port)
|
|
(display (tm:locale-abbr-month (date-month date))
|
|
port)))
|
|
(cons #\B (lambda (date pad-with port)
|
|
(display (tm:locale-long-month (date-month date))
|
|
port)))
|
|
(cons #\c (lambda (date pad-with port)
|
|
(display (date->string date tm:locale-date-time-format) port)))
|
|
(cons #\d (lambda (date pad-with port)
|
|
(display (tm:padding (date-day date)
|
|
#\0 2)
|
|
port)))
|
|
(cons #\D (lambda (date pad-with port)
|
|
(display (date->string date "~m/~d/~y") port)))
|
|
(cons #\e (lambda (date pad-with port)
|
|
(display (tm:padding (date-day date)
|
|
#\space 2)
|
|
port)))
|
|
(cons #\f (lambda (date pad-with port)
|
|
(if (> (date-nanosecond date)
|
|
tm:nano)
|
|
(display (tm:padding (+ (date-second date) 1)
|
|
pad-with 2)
|
|
port)
|
|
(display (tm:padding (date-second date)
|
|
pad-with 2)
|
|
port))
|
|
(receive (i f)
|
|
(tm:split-real (/
|
|
(date-nanosecond date)
|
|
(* tm:nano 1.0)))
|
|
(let* ((ns (number->string f))
|
|
(le (string-length ns)))
|
|
(if (> le 2)
|
|
(begin
|
|
(display tm:locale-number-separator port)
|
|
(display (substring ns 2 le) port)))))))
|
|
(cons #\h (lambda (date pad-with port)
|
|
(display (date->string date "~b") port)))
|
|
(cons #\H (lambda (date pad-with port)
|
|
(display (tm:padding (date-hour date)
|
|
pad-with 2)
|
|
port)))
|
|
(cons #\I (lambda (date pad-with port)
|
|
(let ((hr (date-hour date)))
|
|
(if (> hr 12)
|
|
(display (tm:padding (- hr 12)
|
|
pad-with 2)
|
|
port)
|
|
(display (tm:padding hr
|
|
pad-with 2)
|
|
port)))))
|
|
(cons #\j (lambda (date pad-with port)
|
|
(display (tm:padding (date-year-day date)
|
|
pad-with 3)
|
|
port)))
|
|
(cons #\k (lambda (date pad-with port)
|
|
(display (tm:padding (date-hour date)
|
|
#\space 2)
|
|
port)))
|
|
(cons #\l (lambda (date pad-with port)
|
|
(let ((hr (if (> (date-hour date) 12)
|
|
(- (date-hour date) 12) (date-hour date))))
|
|
(display (tm:padding hr #\space 2)
|
|
port))))
|
|
(cons #\m (lambda (date pad-with port)
|
|
(display (tm:padding (date-month date)
|
|
pad-with 2)
|
|
port)))
|
|
(cons #\M (lambda (date pad-with port)
|
|
(display (tm:padding (date-minute date)
|
|
pad-with 2)
|
|
port)))
|
|
(cons #\n (lambda (date pad-with port)
|
|
(newline port)))
|
|
(cons #\N (lambda (date pad-with port)
|
|
(display (tm:padding (date-nanosecond date)
|
|
pad-with 7)
|
|
port)))
|
|
(cons #\p (lambda (date pad-with port)
|
|
(display (tm:locale-am/pm (date-hour date)) port)))
|
|
(cons #\r (lambda (date pad-with port)
|
|
(display (date->string date "~I:~M:~S ~p") port)))
|
|
(cons #\s (lambda (date pad-with port)
|
|
(display (time-second (date->time-utc date)) port)))
|
|
(cons #\S (lambda (date pad-with port)
|
|
(if (> (date-nanosecond date)
|
|
tm:nano)
|
|
(display (tm:padding (+ (date-second date) 1)
|
|
pad-with 2)
|
|
port)
|
|
(display (tm:padding (date-second date)
|
|
pad-with 2)
|
|
port))))
|
|
(cons #\t (lambda (date pad-with port)
|
|
(display char-tab port)))
|
|
(cons #\T (lambda (date pad-with port)
|
|
(display (date->string date "~H:~M:~S") port)))
|
|
(cons #\U (lambda (date pad-with port)
|
|
(if (> (tm:days-before-first-week date 0) 0)
|
|
(display (tm:padding (+ (date-week-number date 0) 1)
|
|
#\0 2) port)
|
|
(display (tm:padding (date-week-number date 0)
|
|
#\0 2) port))))
|
|
(cons #\V (lambda (date pad-with port)
|
|
(display (tm:padding (date-week-number date 1)
|
|
#\0 2) port)))
|
|
(cons #\w (lambda (date pad-with port)
|
|
(display (date-week-day date) port)))
|
|
(cons #\x (lambda (date pad-with port)
|
|
(display (date->string date tm:locale-short-date-format) port)))
|
|
(cons #\X (lambda (date pad-with port)
|
|
(display (date->string date tm:locale-time-format) port)))
|
|
(cons #\W (lambda (date pad-with port)
|
|
(if (> (tm:days-before-first-week date 1) 0)
|
|
(display (tm:padding (+ (date-week-number date 1) 1)
|
|
#\0 2) port)
|
|
(display (tm:padding (date-week-number date 1)
|
|
#\0 2) port))))
|
|
(cons #\y (lambda (date pad-with port)
|
|
(display (tm:padding (tm:last-n-digits
|
|
(date-year date) 2)
|
|
pad-with
|
|
2)
|
|
port)))
|
|
(cons #\Y (lambda (date pad-with port)
|
|
(display (date-year date) port)))
|
|
(cons #\z (lambda (date pad-with port)
|
|
(tm:tz-printer (date-zone-offset date) port)))
|
|
(cons #\Z (lambda (date pad-with port)
|
|
(tm:locale-print-time-zone date port)))
|
|
(cons #\1 (lambda (date pad-with port)
|
|
(display (date->string date "~Y-~m-~d") port)))
|
|
(cons #\2 (lambda (date pad-with port)
|
|
(display (date->string date "~H:~M:~S~z") port)))
|
|
(cons #\3 (lambda (date pad-with port)
|
|
(display (date->string date "~H:~M:~S") port)))
|
|
(cons #\4 (lambda (date pad-with port)
|
|
(display (date->string date "~Y-~m-~dT~H:~M:~S~z") port)))
|
|
(cons #\5 (lambda (date pad-with port)
|
|
(display (date->string date "~Y-~m-~dT~H:~M:~S") port)))
|
|
))
|
|
|
|
|
|
(define (tm:get-formatter char)
|
|
(let ( (associated (assoc char tm:directives)) )
|
|
(if associated (cdr associated) #f)))
|
|
|
|
(define (tm:date-printer date index format-string str-len port)
|
|
(if (>= index str-len)
|
|
(values)
|
|
(let ((current-char (string-ref format-string index)))
|
|
(if (not (char=? current-char #\~))
|
|
(begin
|
|
(display current-char port)
|
|
(tm:date-printer date (+ index 1) format-string str-len port))
|
|
(if (= (+ index 1) str-len) ; bad format string.
|
|
(tm:time-error 'tm:date-printer 'bad-date-format-string
|
|
format-string)
|
|
(let ((pad-char? (string-ref format-string (+ index 1))))
|
|
(cond
|
|
((char=? pad-char? #\-)
|
|
(if (= (+ index 2) str-len) ; bad format string.
|
|
(tm:time-error 'tm:date-printer
|
|
'bad-date-format-string
|
|
format-string)
|
|
(let ((formatter (tm:get-formatter
|
|
(string-ref format-string
|
|
(+ index 2)))))
|
|
(if (not formatter)
|
|
(tm:time-error 'tm:date-printer
|
|
'bad-date-format-string
|
|
format-string)
|
|
(begin
|
|
(formatter date #f port)
|
|
(tm:date-printer date
|
|
(+ index 3)
|
|
format-string
|
|
str-len
|
|
port))))))
|
|
|
|
((char=? pad-char? #\_)
|
|
(if (= (+ index 2) str-len) ; bad format string.
|
|
(tm:time-error 'tm:date-printer
|
|
'bad-date-format-string
|
|
format-string)
|
|
(let ((formatter (tm:get-formatter
|
|
(string-ref format-string
|
|
(+ index 2)))))
|
|
(if (not formatter)
|
|
(tm:time-error 'tm:date-printer
|
|
'bad-date-format-string
|
|
format-string)
|
|
(begin
|
|
(formatter date #\space port)
|
|
(tm:date-printer date
|
|
(+ index 3)
|
|
format-string
|
|
str-len
|
|
port))))))
|
|
(else
|
|
(let ((formatter (tm:get-formatter
|
|
(string-ref format-string
|
|
(+ index 1)))))
|
|
(if (not formatter)
|
|
(tm:time-error 'tm:date-printer
|
|
'bad-date-format-string
|
|
format-string)
|
|
(begin
|
|
(formatter date #\0 port)
|
|
(tm:date-printer date
|
|
(+ index 2)
|
|
format-string
|
|
str-len
|
|
port))))))))))))
|
|
|
|
|
|
(define (date->string date . format-string)
|
|
(let ( (str-port (open-output-string))
|
|
(fmt-str (:optional format-string "~c")) )
|
|
(tm:date-printer date 0 fmt-str (string-length fmt-str) str-port)
|
|
(get-output-string str-port)))
|
|
|
|
(define (tm:char->int ch)
|
|
(case ch
|
|
((#\0) 0)
|
|
((#\1) 1)
|
|
((#\2) 2)
|
|
((#\3) 3)
|
|
((#\4) 4)
|
|
((#\5) 5)
|
|
((#\6) 6)
|
|
((#\7) 7)
|
|
((#\8) 8)
|
|
((#\9) 9)
|
|
(else (tm:time-error 'bad-date-template-string
|
|
(list "Non-integer character" ch)))))
|
|
|
|
;; read an integer upto n characters long on port; upto -> #f is any length
|
|
(define (tm:integer-reader upto port)
|
|
(let loop ((accum 0) (nchars 0))
|
|
(let ((ch (peek-char port)))
|
|
(if (or (eof-object? ch)
|
|
(not (char-numeric? ch))
|
|
(and upto (>= nchars upto)))
|
|
accum
|
|
(loop (+ (* accum 10) (tm:char->int (read-char port)))
|
|
(+ nchars 1))))))
|
|
|
|
(define (tm:make-integer-reader upto)
|
|
(lambda (port)
|
|
(tm:integer-reader upto port)))
|
|
|
|
;; read *exactly* n characters and convert to integer; could be padded
|
|
(define (tm:integer-reader-exact n port)
|
|
(let ((padding-ok #t))
|
|
(define (accum-int port accum nchars)
|
|
(let ((ch (peek-char port)))
|
|
(cond
|
|
((>= nchars n) accum)
|
|
((eof-object? ch)
|
|
(tm:time-error 'string->date 'bad-date-template-string
|
|
"Premature ending to integer read."))
|
|
((char-numeric? ch)
|
|
(set! padding-ok #f)
|
|
(accum-int port (+ (* accum 10) (tm:char->int (read-char
|
|
port)))
|
|
(+ nchars 1)))
|
|
(padding-ok
|
|
(read-char port) ; consume padding
|
|
(accum-int port accum (+ nchars 1)))
|
|
(else ; padding where it shouldn't be
|
|
(tm:time-error 'string->date 'bad-date-template-string
|
|
"Non-numeric characters in integer read.")))))
|
|
(accum-int port 0 0)))
|
|
|
|
|
|
(define (tm:make-integer-exact-reader n)
|
|
(lambda (port)
|
|
(tm:integer-reader-exact n port)))
|
|
|
|
(define (tm:zone-reader port)
|
|
(let ( (offset 0)
|
|
(positive? #f) )
|
|
(let ( (ch (read-char port)) )
|
|
(if (eof-object? ch)
|
|
(tm:time-error 'string->date 'bad-date-template-string
|
|
(list "Invalid time zone +/-" ch)))
|
|
(if (or (char=? ch #\Z) (char=? ch #\z))
|
|
0
|
|
(begin
|
|
(cond
|
|
((char=? ch #\+) (set! positive? #t))
|
|
((char=? ch #\-) (set! positive? #f))
|
|
(else
|
|
(tm:time-error 'string->date 'bad-date-template-string
|
|
(list "Invalid time zone +/-" ch))))
|
|
(let ((ch (read-char port)))
|
|
(if (eof-object? ch)
|
|
(tm:time-error 'string->date 'bad-date-template-string
|
|
(list "Invalid time zone number" ch)))
|
|
(set! offset (* (tm:char->int ch)
|
|
10 60 60)))
|
|
(let ((ch (read-char port)))
|
|
(if (eof-object? ch)
|
|
(tm:time-error 'string->date 'bad-date-template-string
|
|
(list "Invalid time zone number" ch)))
|
|
(set! offset (+ offset (* (tm:char->int ch)
|
|
60 60))))
|
|
(let ((ch (read-char port)))
|
|
(if (eof-object? ch)
|
|
(tm:time-error 'string->date 'bad-date-template-string
|
|
(list "Invalid time zone number" ch)))
|
|
(set! offset (+ offset (* (tm:char->int ch)
|
|
10 60))))
|
|
(let ((ch (read-char port)))
|
|
(if (eof-object? ch)
|
|
(tm:time-error 'string->date 'bad-date-template-string
|
|
(list "Invalid time zone number" ch)))
|
|
(set! offset (+ offset (* (tm:char->int ch)
|
|
60))))
|
|
(if positive? offset (- offset)))))))
|
|
|
|
;; looking at a char, read the char string, run thru indexer, return index
|
|
(define (tm:locale-reader port indexer)
|
|
|
|
(define (read-char-string result)
|
|
(let ((ch (peek-char port)))
|
|
(if (char-alphabetic? ch)
|
|
(read-char-string (cons (read-char port) result))
|
|
(list->string (reverse! result)))))
|
|
|
|
(let* ((str (read-char-string '()))
|
|
(index (indexer str)))
|
|
(if index index (tm:time-error 'string->date
|
|
'bad-date-template-string
|
|
(list "Invalid string for " indexer)))))
|
|
|
|
(define (tm:make-locale-reader indexer)
|
|
(lambda (port)
|
|
(tm:locale-reader port indexer)))
|
|
|
|
(define (tm:make-char-id-reader char)
|
|
(lambda (port)
|
|
(if (char=? char (read-char port))
|
|
char
|
|
(tm:time-error 'string->date
|
|
'bad-date-template-string
|
|
"Invalid character match."))))
|
|
|
|
;; A List of formatted read directives.
|
|
;; Each entry is a list.
|
|
;; 1. the character directive;
|
|
;; a procedure, which takes a character as input & returns
|
|
;; 2. #t as soon as a character on the input port is acceptable
|
|
;; for input,
|
|
;; 3. a port reader procedure that knows how to read the current port
|
|
;; for a value. Its one parameter is the port.
|
|
;; 4. a action procedure, that takes the value (from 3.) and some
|
|
;; object (here, always the date) and (probably) side-effects it.
|
|
;; In some cases (e.g., ~A) the action is to do nothing
|
|
|
|
(define tm:read-directives
|
|
(let ((ireader4 (tm:make-integer-reader 4))
|
|
(ireader2 (tm:make-integer-reader 2))
|
|
(ireaderf (tm:make-integer-reader #f))
|
|
(eireader2 (tm:make-integer-exact-reader 2))
|
|
(eireader4 (tm:make-integer-exact-reader 4))
|
|
(locale-reader-abbr-weekday (tm:make-locale-reader
|
|
tm:locale-abbr-weekday->index))
|
|
(locale-reader-long-weekday (tm:make-locale-reader
|
|
tm:locale-long-weekday->index))
|
|
(locale-reader-abbr-month (tm:make-locale-reader
|
|
tm:locale-abbr-month->index))
|
|
(locale-reader-long-month (tm:make-locale-reader
|
|
tm:locale-long-month->index))
|
|
(char-fail (lambda (ch) #t))
|
|
(do-nothing (lambda (val object) (values))))
|
|
|
|
(list
|
|
(list #\~ char-fail (tm:make-char-id-reader #\~) do-nothing)
|
|
(list #\a char-alphabetic? locale-reader-abbr-weekday do-nothing)
|
|
(list #\A char-alphabetic? locale-reader-long-weekday do-nothing)
|
|
(list #\b char-alphabetic? locale-reader-abbr-month
|
|
(lambda (val object)
|
|
(set-date-month! object val)))
|
|
(list #\B char-alphabetic? locale-reader-long-month
|
|
(lambda (val object)
|
|
(set-date-month! object val)))
|
|
(list #\d char-numeric? ireader2 (lambda (val object)
|
|
(set-date-day!
|
|
object val)))
|
|
(list #\e char-fail eireader2 (lambda (val object)
|
|
(set-date-day! object val)))
|
|
(list #\h char-alphabetic? locale-reader-abbr-month
|
|
(lambda (val object)
|
|
(set-date-month! object val)))
|
|
(list #\H char-numeric? ireader2 (lambda (val object)
|
|
(set-date-hour! object val)))
|
|
(list #\k char-fail eireader2 (lambda (val object)
|
|
(set-date-hour! object val)))
|
|
(list #\m char-numeric? ireader2 (lambda (val object)
|
|
(set-date-month! object val)))
|
|
(list #\M char-numeric? ireader2 (lambda (val object)
|
|
(set-date-minute!
|
|
object val)))
|
|
(list #\S char-numeric? ireader2 (lambda (val object)
|
|
(set-date-second! object val)))
|
|
(list #\y char-fail eireader2
|
|
(lambda (val object)
|
|
(set-date-year! object (tm:natural-year val))))
|
|
(list #\Y char-numeric? ireader4 (lambda (val object)
|
|
(set-date-year! object val)))
|
|
(list #\z (lambda (c)
|
|
(or (char=? c #\Z)
|
|
(char=? c #\z)
|
|
(char=? c #\+)
|
|
(char=? c #\-)))
|
|
tm:zone-reader (lambda (val object)
|
|
(set-date-zone-offset! object val))))))
|
|
|
|
(define (tm:string->date date index format-string str-len port template-string)
|
|
(define (skip-until port skipper)
|
|
(let ((ch (peek-char port)))
|
|
(if (eof-object? ch)
|
|
(tm:time-error 'string->date 'bad-date-format-string template-string)
|
|
(if (not (skipper ch))
|
|
(begin (read-char port) (skip-until port skipper))))))
|
|
(if (>= index str-len)
|
|
(begin
|
|
(values))
|
|
(let ((current-char (string-ref format-string index)))
|
|
(if (not (char=? current-char #\~))
|
|
(let ((port-char (read-char port)))
|
|
(if (or (eof-object? port-char)
|
|
(not (char=? current-char port-char)))
|
|
(tm:time-error 'string->date
|
|
'bad-date-format-string template-string))
|
|
(tm:string->date date
|
|
(+ index 1)
|
|
format-string
|
|
str-len
|
|
port
|
|
template-string))
|
|
;; otherwise, it's an escape, we hope
|
|
(if (> (+ index 1) str-len)
|
|
(tm:time-error 'string->date
|
|
'bad-date-format-string template-string)
|
|
(let* ((format-char (string-ref format-string (+ index 1)))
|
|
(format-info (assoc format-char tm:read-directives)))
|
|
(if (not format-info)
|
|
(tm:time-error 'string->date
|
|
'bad-date-format-string template-string)
|
|
(begin
|
|
(let ((skipper (cadr format-info))
|
|
(reader (caddr format-info))
|
|
(actor (cadddr format-info)))
|
|
(skip-until port skipper)
|
|
(let ((val (reader port)))
|
|
(if (eof-object? val)
|
|
(tm:time-error 'string->date
|
|
'bad-date-format-string
|
|
template-string)
|
|
(actor val date)))
|
|
(tm:string->date date
|
|
(+ index 2)
|
|
format-string
|
|
str-len
|
|
port
|
|
template-string))))))))))
|
|
|
|
(define (string->date input-string template-string)
|
|
(define (tm:date-ok? date)
|
|
(and (date-nanosecond date)
|
|
(date-second date)
|
|
(date-minute date)
|
|
(date-hour date)
|
|
(date-day date)
|
|
(date-month date)
|
|
(date-year date)
|
|
(date-zone-offset date)))
|
|
(let ((newdate (make-date 0 0 0 0 #f #f #f #f)))
|
|
(tm:string->date newdate
|
|
0
|
|
template-string
|
|
(string-length template-string)
|
|
(open-input-string input-string)
|
|
template-string)
|
|
(if (not (date-zone-offset newdate))
|
|
(begin
|
|
;; this is necessary to get DST right -- as far as we can
|
|
;; get it right (think of the double/missing hour in the
|
|
;; night when we are switching between normal time and DST).
|
|
(set-date-zone-offset! newdate
|
|
(tm:local-tz-offset
|
|
(make-time time-utc 0 0)))
|
|
(set-date-zone-offset! newdate
|
|
(tm:local-tz-offset
|
|
(date->time-utc newdate)))))
|
|
(if (tm:date-ok? newdate)
|
|
newdate
|
|
(tm:time-error
|
|
'string->date
|
|
'bad-date-format-string
|
|
(list "Incomplete date read. " newdate template-string)))))
|
|
;;; srfi-19.scm ends here |