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This commit is contained in:
Justin Ethier 2016-07-02 00:13:50 -04:00
parent ad199f61d3
commit 439bda440d
1 changed files with 33 additions and 1 deletions
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34
scheme/base.sld
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@ -843,6 +843,38 @@
fill)))
(list->string
(apply make-list (cons k fill*)))))
;(define-syntax parameterize
; (syntax-rules ()
; ((parameterize
; ("step")
; ((param value p old new) ...)
; ()
; body)
; (let ((p param) ...)
; (let ((old (p))
; ...
; (new ((p <param-convert>) value))
; ...)
; (dynamic-wind
; (lambda () (p <param-set!> new) ...)
; (lambda () . body)
; (lambda () (p <param-set!> old) ...)))))
; ((parameterize
; ("step")
; args
; ((param value) . rest)
; body)
; (parameterize
; ("step")
; ((param value p old new) . args)
; rest
; body))
; ((parameterize ((param value) ...) . body)
; (parameterize
; ("step")
; ()
; ((param value) ...)
; body))))
(define (make-parameter init . o)
(let* ((converter
(if (pair? o) (car o) (lambda (x) x)))
@ -856,7 +888,7 @@
((eq? (car args) '<param-convert>)
converter)
(else
(error "bad parameter syntax"))))))
(error "bad parameter syntax" args))))))
(define current-output-port
(make-parameter (Cyc-stdout)))
(define current-input-port