#| -*-Scheme-*-

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|#

;;;; Runtime-system adapters
;;; package: (edwin adapters)

;;; This file contains adapters that bridge between Edwin and the runtime
;;; system.  These are necessary because Edwin has assumptions about the
;;; behavior of the runtime system that are no longer valid.  Since some of
;;; these assumptions are deeply rooted, it's easier to adapt around them rather
;;; than rewrite Edwin.

;;; The most critical assumption is that Edwin relies on an older model of
;;; strings, in which each character is a byte, and the default coding is ISO
;;; 8859-1, while the runtime system now supports full Unicode and uses a
;;; default coding of UTF 8.  Most of that is taken care of by the (edwin
;;; string) package, which contains a copy of the runtime's old string
;;; implementation.  Other things, like file I/O, are handled here.



(define (call-with-file-adapter procedure)
  (lambda (pathname receiver)
    (procedure pathname
               (lambda (port)
                 (port/set-coding port 'iso-8859-1)
                 (receiver port)))))


(define edwin:call-with-append-file
  (call-with-file-adapter call-with-append-file))

(define edwin:call-with-input-file
  (call-with-file-adapter call-with-input-file))

(define edwin:call-with-output-file
  (call-with-file-adapter call-with-output-file))

(define char-set:graphic
  (char-set-union (ucs-range->char-set #x20 #x7F)
		  (ucs-range->char-set #xA0 #x100)))