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(define-module (vcomponent parse types)
:use-module (util)
:use-module (util exceptions)
:use-module (util base64)
:use-module (rnrs io ports)
:use-module (datetime)
)
;; BINARY
(define (parse-binary props value)
;; p 30
(unless (string=? "BASE64" (hashq-ref props 'ENCODING))
(warning "Binary field not marked ENCODING=BASE64"))
(base64->bytevector
(string->bytevector value (make-transcoder (latin-1-codec)))))
;; BOOLEAN
(define (parse-boolean props value)
(cond
[(string=? "TRUE" value) #t]
[(string=? "FALSE" value) #f]
[else (warning "~a invalid boolean" value)]))
;; CAL-ADDRESS ⇒ uri
;; DATE
(define (parse-date props value)
(parse-ics-date value))
;; DATE-TIME
(define (parse-datetime props value)
(parse-ics-datetime value (hashq-ref props 'TZID #f)))
;; DURATION
(define (parse-duration props value)
((@ (vcomponent duration) parse-duration)
value))
;; FLOAT
;; Note that this is overly permissive, and flawed.
;; Numbers such as @expr{1/2} is accepted as exact
;; rationals. Some floats are rounded.
(define (parse-float props value)
(string->number value))
;; INTEGER
(define (parse-integer props value)
(let ((n (string->number value)))
(unless (integer? n)
(warning "Non integer as integer"))
n))
;; PERIOD
(define (parse-period props value)
(let* (((left right) (string-split value #\/)))
;; TODO timezones? VALUE=DATE?
(cons (parse-ics-datetime left)
((if (memv (string-ref right 0)
'(#\P #\+ #\-))
(@ (vcomponent duration) parse-duration)
parse-ics-datetime)
right))))
;; RECUR
(define (parse-recur props value)
(parse-recurrence-rule value))
;; TEXT
;; TODO quoted strings and escaped chars
(define (parse-text props value)
value)
;; TIME
(define (parse-time props value)
;; TODO time can have timezones...
(parse-ics-time value))
;; URI
(define (parse-uri props value)
value)
(define-immutable-record-type <utc-offset>
(make-utc-offset pm hour minute second)
utc-offset?
(pm offset-pm)
(hour offset-hour)
(minute offset-minute)
(second offset-second))
;; UTC-OFFSET
(define (parse-utc-offset props value)
(make-utc-offset
(string->symbol (substring value 0 1))
(number->string (substring value 1 3))
(number->string (substring value 3 5))
(if (= 7 (string-length value))
(number->string (substring value 5 7))
0)))
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