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(define-module (vcomponent recurrence internal)
:use-module (srfi srfi-1)
:use-module (srfi srfi-71)
:use-module (srfi srfi-88) ; better keywords
:use-module ((vcomponent base) :select (prop))
:use-module (ice-9 i18n)
:use-module (ice-9 format)
:use-module (ice-9 pretty-print)
:use-module (hnh util)
:use-module (hnh util object)
:use-module ((hnh util type) :select (list-of pair-of false?))
:use-module (datetime)
:replace (count)
:export (repeating?
recur-rule
freq until interval bysecond byminute byhour
byday bymonthday byyearday byweekno bymonth bysetpos
wkst
freq-placeholder
recur-rule->rrule-string
recur-rule->rrule-sxml
weekdays
intervals
))
(define weekdays
(weekday-list sun))
(define freq-placeholder (gensym))
(define intervals
`(SECONDLY MINUTELY HOURLY DAILY WEEKLY MONTHLY YEARLY
,freq-placeholder))
;; EXDATE is also a property linked to recurense rules
;; but that property alone don't create a recuring event.
(define (repeating? ev)
"Does this event repeat?"
(or (prop ev 'RRULE)
(prop ev 'RDATE)
(prop ev '-X-HNH-ALTERNATIVES)))
(define-syntax-rule (in-range? x start end)
(<= start x end))
(define (recur-rule-constructor-factory primitive-constructor type-checker)
;; Interval and wkst have default values, since those are assumed
;; anyways, and having them set frees us from having to check them at
;; the use site.
(lambda* (key: freq until count (interval 1) bysecond byminute
byhour byday bymonthday byyearday byweekno bymonth
bysetpos (wkst monday))
;; Allow `(cons #f day)' to be written as just `day'.
(let ((byday* (if byday
(map (lambda (day)
(if (number? day)
(cons #f day)
day))
byday)
#f)))
;; TODO possibly check that until and count are mutually exclusive
(type-checker
freq until count interval bysecond byminute byhour
byday* bymonthday byyearday byweekno bymonth bysetpos
wkst)
(primitive-constructor
freq until count interval bysecond byminute byhour
byday* bymonthday byyearday byweekno bymonth bysetpos
wkst))))
(define (serialize-recur-rule record)
`(recur-rule
,@(when (freq record) `(freq: ,(freq record)))
,@(when (until record) `(until: ,(until record)))
,@(when (count record) `(count: ,(count record)))
,@(when (interval record) `(interval: ,(interval record)))
,@(when (bysecond record) `(bysecond: ,(bysecond record)))
,@(when (byminute record) `(byminute: ,(byminute record)))
,@(when (byhour record) `(byhour: ,(byhour record)))
,@(when (byday record) `(byday: ,(byday record)))
,@(when (bymonthday record) `(bymonthday: ,(bymonthday record)))
,@(when (byyearday record) `(byyearday: ,(byyearday record)))
,@(when (byweekno record) `(byweekno: ,(byweekno record)))
,@(when (bymonth record) `(bymonth: ,(bymonth record)))
,@(when (bysetpos record) `(bysetpos: ,(bysetpos record)))
,@(when (wkst record) `(wkst: ,(wkst record)))))
;;; Both interval and wkst are optional by the standard.
;;; We however default those to 1 and monday in the constructor
;;; saving us from checking at the use site.
(define-type (recur-rule
constructor: recur-rule-constructor-factory
printer: (lambda (record port)
(pretty-print (serialize-recur-rule record)
port display?: #f)))
(freq type: (memv intervals))
(until type: (or false? date? datetime?))
(count type: (or false? (and integer? positive?)))
(interval type: (and integer? positive?))
(bysecond type: (or false? (list-of (in-range? 0 60))))
(byminute type: (or false? (list-of (in-range? 0 59))))
(byhour type: (or false? (list-of (in-range? 0 23))))
(byday type: (or false? (list-of (pair-of (or false? integer?)
(memv weekdays)))))
(bymonthday type: (or false? (list-of (and (not zero?) (in-range? -31 31)))))
(byyearday type: (or false? (list-of (and (not zero?) (in-range? -366 366)))))
(byweekno type: (or false? (list-of (and (not zero?) (in-range? -53 53)))))
(bymonth type: (or false? (list-of (and (not zero?) (in-range? -12 12)))))
(bysetpos type: (or false? (list-of (and (not zero?) (in-range? -366 366)))))
(wkst type: (memv weekdays)))
(define (byday->string pair)
(let ((off day (car+cdr pair)))
(string-append
(or (and=> off number->string) "")
(string-upcase
(week-day-name day 2
locale: (make-locale (list LC_TIME) "C"))))))
(define (field->string field value)
(case field
[(wkst)
(string-upcase
(week-day-name value 2
locale: (make-locale (list LC_TIME) "C")))]
[(byday)
(string-join (map byday->string value) ",")]
[(freq count interval)
(format #f "~a" value)]
[(until)
(if (date? value)
(date->string value "~Y~m~d")
(datetime->string value "~Y~m~dT~H~M~S~Z"))]
[else (format #f "~{~a~^,~}" value)]))
(define (map-fields proc rrule)
(define (get f)
((record-accessor <recur-rule> f) rrule))
(filter-map
(lambda (field)
(if (not (get field))
#f (proc field (get field))))
(record-type-fields <recur-rule>)))
(define (recur-rule->rrule-string rrule)
(string-join
(map-fields
(lambda (field value)
(string-append
(string-upcase (symbol->string field))
"=" (field->string field value)))
rrule)
";"))
(define (recur-rule->rrule-sxml rrule)
(map-fields
(lambda (field value)
(cond [(string-ci=? "UNTIL" (symbol->string field))
`(until
,(if (date? value)
(date->string value "~Y-~m-~d")
(datetime->string
value "~Y-~m-~dT~H:~M:~S~Z")))]
[(string-ci=? "BYDAY" (symbol->string field))
(map (lambda (v)
`(,(downcase-symbol field)
,(byday->string v)))
value)
]
[(string-ci=? "BY" (substring (symbol->string field)
0 2))
(map (lambda (v)
`(,(downcase-symbol field)
,v))
value)]
[else
`(,(downcase-symbol field)
,(field->string field value))]))
rrule))
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