44 lines
1.2 KiB
Scheme
44 lines
1.2 KiB
Scheme
(define-library (srfi 17)
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(import (except (scheme base) set!)
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(prefix (only (scheme base) set!) %)
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(except (picrin base) set!)
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(srfi 1)
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(srfi 8))
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(define-syntax set!
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(syntax-rules ()
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((_ (proc args ...) val)
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((setter proc) args ... val))
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((_ var val)
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(%set! var val))))
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(define setter
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(letrec ((setter
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(lambda (proc)
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(let ((setter (dictionary-ref (attribute proc) '@@setter)))
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(if setter
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(cdr setter)
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(error "no setter found")))))
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(set-setter!
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(lambda (proc setter)
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(dictionary-set! (attribute proc) '@@setter setter))))
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(set-setter! setter set-setter!)
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setter))
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(define (getter-with-setter get set)
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(let ((proc (lambda args (apply get args))))
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(set! (setter proc) set)
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proc))
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(set! (setter car) set-car!)
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(set! (setter cdr) set-cdr!)
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(set! (setter vector-ref) vector-set!)
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(set! (setter string-ref) string-set!)
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(set! (setter bytevector-u8-ref) bytevector-u8-set!)
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(set! (setter list-ref) list-set!)
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(export set!
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setter
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getter-with-setter))
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