picrin/contrib/10.srfi/srfi/17.scm

44 lines
1.2 KiB
Scheme

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