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typesetting/pitfall/restructure/helper.rkt

21 lines
747 B
Racket

#lang racket/base
(require (for-syntax racket/base br/syntax) racket/class br/define "base.rkt")
(provide (all-defined-out) (all-from-out "base.rkt"))
(define-macro (test-module . EXPRS)
#`(module+ test
(require #,(datum->syntax caller-stx 'rackunit) #,(datum->syntax caller-stx 'racket/serialize))
. EXPRS))
(define index? (λ (x) (and (number? x) (integer? x) (not (negative? x)))))
(define key? symbol?)
(define (keys? x) (and (pair? x) (andmap key? x)))
(define (unsigned->signed uint bits)
(define most-significant-bit-mask (arithmetic-shift 1 (sub1 bits)))
(- (bitwise-xor uint most-significant-bit-mask) most-significant-bit-mask))
(define (signed->unsigned sint bits)
(bitwise-and sint (arithmetic-shift 1 bits)))