aboutsummaryrefslogtreecommitdiff
path: root/module/vcalendar/recurrence/parse.scm
diff options
context:
space:
mode:
authorHugo Hörnquist <hugo@hornquist.se>2019-04-23 18:03:49 +0200
committerHugo Hörnquist <hugo@hornquist.se>2019-04-23 18:03:49 +0200
commit8f4fbcd493e28c86c598efcecdb6dc79d8fe0bfe (patch)
tree37e49d78df0916efcb0d547e0b28b63247cfec3d /module/vcalendar/recurrence/parse.scm
parentChange event-length => event-length/day. (diff)
downloadcalp-8f4fbcd493e28c86c598efcecdb6dc79d8fe0bfe.tar.gz
calp-8f4fbcd493e28c86c598efcecdb6dc79d8fe0bfe.tar.xz
Rename module vcalendar => vcomponent.
Diffstat (limited to 'module/vcalendar/recurrence/parse.scm')
-rw-r--r--module/vcalendar/recurrence/parse.scm131
1 files changed, 0 insertions, 131 deletions
diff --git a/module/vcalendar/recurrence/parse.scm b/module/vcalendar/recurrence/parse.scm
deleted file mode 100644
index 50d0e0a8..00000000
--- a/module/vcalendar/recurrence/parse.scm
+++ /dev/null
@@ -1,131 +0,0 @@
-(define-module (vcalendar recurrence parse)
- #:use-module (srfi srfi-1)
- #:use-module (srfi srfi-19) ; Datetime
- #:use-module (srfi srfi-19 util)
- #:use-module (srfi srfi-26)
- #:use-module ((vcalendar datetime) #:select (parse-datetime))
- #:duplicates (last) ; Replace @var{count}
- #:use-module (vcalendar recurrence internal)
- #:use-module (util)
- #:use-module (exceptions)
- #:use-module (ice-9 curried-definitions)
- #:export (parse-recurrence-rule))
-
-
-(define (printerr fmt . args)
- (apply format (current-error-port)
- fmt args))
-
-(define (parse-recurrence-rule str)
- (catch-multiple
- (lambda () (%build-recur-rules str))
-
- [unfulfilled-constraint
- (cont obj key val . rest)
- (printerr "ERR ~a [~a] doesn't fulfill constraint of type [~a], ignoring~%"
- err val key)
- (cont #f)]
-
- [invalid-value
- (cont obj key val . rest)
- (printerr "ERR ~a [~a] for key [~a], ignoring.~%"
- err val key)
- (cont #f)]))
-
-(eval-when (expand)
- (define ((handle-case stx obj) key val proc)
- (with-syntax ((skey (datum->syntax
- stx (symbol-downcase (syntax->datum key)))))
- #`((#,key)
- (let ((v #,val))
- (cond ((not v) (throw-returnable 'invalid-value #,obj (quote #,key) v))
- ((#,proc #,val) (set! (skey #,obj) v))
- (else (set! (skey #,obj)
- (throw-returnable 'unfulfilled-constraint
- #,obj (quote #,key) v)))))))))
-
-
-;; A special form of case only useful in parse-recurrence-rules above.
-;; Each case is on the form (KEY val check-proc) where:
-;; `key` is what should be matched against, and what is used for the setter
-;; `val` is the value to bind to the loop object and
-;; `check` is something the object must conform to
-(define-syntax quick-case
- (lambda (stx)
- (syntax-case stx ()
- ((_ var-key obj (key val proc) ...)
- #`(case var-key
- #,@(map (handle-case stx #'obj)
- #'(key ...)
- #'(val ...)
- #'(proc ...))
- (else obj))))))
-
-(define-syntax all-in
- (syntax-rules ()
- ((_ var rules ...)
- (cut every (lambda (var) (and rules ...)) <>))))
-
-(define (string->number-list val delim)
- (map string->number (string-split val delim)))
-
-(define (string->symbols val delim)
- (map string->symbol (string-split val delim)))
-
-;; @example
-;; <weekday> ∈ weekdays
-;; <weekdaynum> ::= [[±] <num>] <weekday> ;; +3MO
-;; (<weekadynum>, ...)
-;; @end example
-
-;; Returns a pair, where the @code{car} is the offset
-;; and @code{cdr} is the day symbol.
-;; The @code{car} may be @code{#f}.
-(define (parse-day-spec str)
- (let* ((numchars (append '(#\+ #\-) (map integer->char (iota 10 #x30))))
- (num symb (span (cut memv <> numchars)
- (string->list str))))
- (cons (string->number (list->string num))
- (apply symbol symb))))
-
-(define (%build-recur-rules str)
- (fold
- (lambda (kv obj)
- (let* (((key val) kv)
- ;; Lazy fields for the poor man.
- (symb (lambda () (string->symbol val)))
- (date (lambda () (date->time-utc (parse-datetime val))))
- (days (lambda () (map parse-day-spec (string-split val #\,))))
- (num (lambda () (string->number val)))
- (nums (lambda () (string->number-list val #\,))))
- (quick-case (string->symbol key) obj
- (FREQ (symb) (cut memv <> intervals)) ; Required
- (UNTIL (date) identity)
- (COUNT (num) (cut <= 0 <>))
- (INTERVAL (num) (cut <= 0 <>))
- (BYSECOND (nums) (all-in n (<= 0 n 60)))
- (BYMINUTE (nums) (all-in n (<= 0 n 59)))
- (BYHOUR (nums) (all-in n (<= 0 n 23)))
-
- (BYDAY (days)
- (lambda (p*)
- (map (lambda (p)
- (let* (((num . symb) p))
- (memv symb weekdays)))
- p*)))
-
- (BYMONTHDAY (nums) (all-in n (<= -31 n 31) (!= n 0)))
- (BYYEARDAY (nums) (all-in n (<= -366 n 366) (!= n 0)))
- (BYWEEKNO (nums) (all-in n (<= -53 n 53) (!= n 0)))
- (BYMONTH (nums) (all-in n (<= 1 n 12)))
- (BYSETPOS (nums) (all-in n (<= -366 n 366) (!= n 0)))
-
- (WKST (symb) (cut memv <> weekdays))
- )))
-
- ;; obj
- (make-recur-rule 1 'MO)
-
- ;; ((key val) ...)
- (map (cut string-split <> #\=)
- (string-split str #\;))))