From e3ba1d59faffa953780aa3383a5a857add156928 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Hugo=20H=C3=B6rnquist?= <hugo@lysator.liu.se>
Date: Sat, 13 Jun 2020 23:40:25 +0200
Subject: Add parser for all remaining types.

---
 module/vcomponent/parse/types.scm | 101 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 101 insertions(+)
 create mode 100644 module/vcomponent/parse/types.scm

(limited to 'module/vcomponent/parse')

diff --git a/module/vcomponent/parse/types.scm b/module/vcomponent/parse/types.scm
new file mode 100644
index 00000000..2468f038
--- /dev/null
+++ b/module/vcomponent/parse/types.scm
@@ -0,0 +1,101 @@
+(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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