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32 lines
923 B
Racket
32 lines
923 B
Racket
7 years ago
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#lang racket/base
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(require (for-syntax racket/base br/syntax) racket/class br/define)
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(provide (all-defined-out))
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(define (read-bytes-exact count p)
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(define bs (read-bytes count p))
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(unless (and (bytes? bs) (= (bytes-length bs) count))
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(raise-argument-error 'read-bytes-exact (format "byte string length ~a" count) bs))
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bs)
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(define BinaryIO%
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(class object%
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(super-new)
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(abstract decode)
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(abstract encode)
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(abstract size)))
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(define-macro (define-subclass SUPERCLASS (ID . INIT-ARGS) . BODY)
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#'(define ID (class SUPERCLASS (super-new) (init-field . INIT-ARGS) . BODY)))
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(define-macro (getter-field [ID . EXPRS])
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(with-pattern ([_ID (prefix-id "_" #'ID)])
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#'(begin
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(field [(ID _ID) . EXPRS])
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(public (_ID ID))
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(define (_ID) ID))))
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(define-macro (test-module . EXPRS)
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#`(module+ test
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(require #,(datum->syntax caller-stx 'rackunit))
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. EXPRS))
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