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101 lines
3.4 KiB
Racket
101 lines
3.4 KiB
Racket
#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 RBase
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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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(require (for-syntax sugar/debug))
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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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(#,(if (syntax-property caller-stx 'override) #'define/override #'define) (_ID) ID))))
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(define-macro (getter-field/override [ID . EXPRS])
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(syntax-property #'(getter-field [ID . EXPRS]) 'override #t))
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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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(define-macro (define-stub-stop ID)
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(with-pattern ([ERROR-ID (suffix-id (prefix-id (syntax-source #'this) ":" #'ID) ":not-implemented")])
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#'(define (ID . args)
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(error 'ERROR-ID))))
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(provide (rename-out [define-stub-stop define-stub]))
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(define-macro (define-stub-go ID)
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(with-pattern ([ERROR-ID (suffix-id (prefix-id (syntax-source #'this) ":" #'ID) ":not-implemented")])
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#'(define (ID . args)
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(displayln 'ERROR-ID))))
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(define-macro (define-unfinished (ID . ARGS) . BODY)
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(with-pattern ([ID-UNFINISHED (suffix-id (prefix-id (syntax-source #'this) ":" #'ID) ":unfinished")])
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#'(define (ID . ARGS)
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(begin . BODY)
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(error 'ID-UNFINISHED))))
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(define-macro (unfinished)
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(with-pattern ([ID-UNFINISHED (prefix-id (syntax-source caller-stx) ":" (syntax-line caller-stx) ":" #'unfinished)])
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#'(error 'ID-UNFINISHED)))
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(define-macro (define+provide ID . EXPRS)
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#'(begin
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(provide ID)
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(define ID . EXPRS)))
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(require sugar/list)
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(define (listify kvs)
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(for/list ([slice (in-list (slice-at kvs 2))])
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(cons (car slice) (cadr slice))))
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(define-syntax-rule (define-hashifier id hasher) (define (id . kvs) (hasher (listify kvs))))
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(define-hashifier mhash make-hash)
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(define-hashifier mhasheq make-hasheq)
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(define-hashifier mhasheqv make-hasheqv)
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(define (port-position port)
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(define-values (l c p) (port-next-location port))
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p)
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(define-syntax (· stx)
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(syntax-case stx ()
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[(_ x ref)
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#'(cond
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[(object? x) (with-handlers ([exn:fail:object? (λ (exn) (send x ref))])
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(get-field ref x))]
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[(hash? x) (hash-ref x 'ref #f)]
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[else (raise-argument-error '· (format "~a must be object or hash" 'x) x)])]
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[(_ x ref0 . refs) #'(· (· x ref0) . refs)]))
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(define-macro (define-case-macro ID PRED)
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#'(define-macro-cases ID
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[(_ TEST-VAL [(MATCH0 . MATCH-VALS) . RESULT] (... ...) [else . ELSE-RESULT])
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#'(cond
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[(PRED TEST-VAL '(MATCH0 . MATCH-VALS)) . RESULT] (... ...)
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[else . ELSE-RESULT])]
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[(_ TEST-VAL MATCH-CLAUSE (... ...))
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#'(ID TEST-VAL
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MATCH-CLAUSE (... ...)
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[else (error 'ID (format "no match for ~a" TEST-VAL))])]))
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;; like case but strictly uses `eq?` comparison (as opposed to `equal?`)
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(define-case-macro caseq memq) |