You cannot select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
typesetting/pitfall/restructure/array.rkt

36 lines
1.1 KiB
Racket

#lang restructure/racket
(require "number.rkt" "utils.rkt" "streamcoder.rkt")
(provide RArray)
#|
approximates
https://github.com/mbutterick/restructure/blob/master/src/Array.coffee
|#
(define-subclass RStreamcoder (RArray type [length #f] [lengthType 'count])
(define/augment (decode stream [parent #f])
(let ([length (if length
(resolveLength length stream parent)
(send stream length))])
(caseq lengthType
[(count) (for/list ([i (in-range length)])
(send type decode stream this))])))
(define/public (size) (unfinished))
(define/augment (encode stream array [parent #f])
(for ([item (in-list array)])
(send type encode stream item))))
(test-module
(require "decodestream.rkt" "encodestream.rkt")
(define stream (make-object RDecodeStream #"ABCDEFG"))
(define A (make-object RArray uint16be 3))
(check-equal? (send A decode stream) '(16706 17220 17734))
(define os (make-object REncodeStream))
(send A encode os '(16706 17220 17734))
(check-equal? (send os dump) #"ABCDEF"))