73 lines
2.8 KiB
Scheme
73 lines
2.8 KiB
Scheme
|
;;;
|
|||
|
|
;;; Copyright (c) 1985 Massachusetts Institute of Technology
|
|||
|
|
;;;
|
|||
|
|
;;; This material was developed by the Scheme project at the
|
|||
|
|
;;; Massachusetts Institute of Technology, Department of
|
|||
|
|
;;; Electrical Engineering and Computer Science. Permission to
|
|||
|
|
;;; copy this software, to redistribute it, and to use it for any
|
|||
|
|
;;; purpose is granted, subject to the following restrictions and
|
|||
|
|
;;; understandings.
|
|||
|
|
;;;
|
|||
|
|
;;; 1. Any copy made of this software must include this copyright
|
|||
|
|
;;; notice in full.
|
|||
|
|
;;;
|
|||
|
|
;;; 2. Users of this software agree to make their best efforts (a)
|
|||
|
|
;;; to return to the MIT Scheme project any improvements or
|
|||
|
|
;;; extensions that they make, so that these may be included in
|
|||
|
|
;;; future releases; and (b) to inform MIT of noteworthy uses of
|
|||
|
|
;;; this software.
|
|||
|
|
;;;
|
|||
|
|
;;; 3. All materials developed as a consequence of the use of
|
|||
|
|
;;; this software shall duly acknowledge such use, in accordance
|
|||
|
|
;;; with the usual standards of acknowledging credit in academic
|
|||
|
|
;;; research.
|
|||
|
|
;;;
|
|||
|
|
;;; 4. MIT has made no warrantee or representation that the
|
|||
|
|
;;; operation of this software will be error-free, and MIT is
|
|||
|
|
;;; under no obligation to provide any services, by way of
|
|||
|
|
;;; maintenance, update, or otherwise.
|
|||
|
|
;;;
|
|||
|
|
;;; 5. In conjunction with products arising from the use of this
|
|||
|
|
;;; material, there shall be no use of the name of the
|
|||
|
|
;;; Massachusetts Institute of Technology nor of any adaptation
|
|||
|
|
;;; thereof in any advertising, promotional, or sales literature
|
|||
|
|
;;; without prior written consent from MIT in each case.
|
|||
|
|
;;;
|
|||
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
|
;;;
|
|||
|
|
;;; Modified by Texas Instruments Inc 8/15/85
|
|||
|
|
;;;
|
|||
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|||
|
|
|
|||
|
|
(define (twiddle-characters m1 m2)
|
|||
|
|
(let ((m* (mark-left-inserting m2)))
|
|||
|
|
(region-insert! m* (region-extract! (make-region (mark-1+ m1 'ERROR) m1)))
|
|||
|
|
(set-current-point! m*)))
|
|||
|
|
|
|||
|
|
(define (%edwin-transpose-characters argument)
|
|||
|
|
(cond ((conjunction (= argument 1) (line-end? (current-point)))
|
|||
|
|
(twiddle-characters (mark-1+ (current-point) 'ERROR)
|
|||
|
|
(current-point)))
|
|||
|
|
((positive? argument)
|
|||
|
|
(twiddle-characters (current-point)
|
|||
|
|
(mark+ (current-point) argument 'ERROR)))
|
|||
|
|
((negative? argument)
|
|||
|
|
(twiddle-characters (current-point)
|
|||
|
|
(mark- (current-point) (1+ (- argument)) 'ERROR)))
|
|||
|
|
(else
|
|||
|
|
(let ((m1 (mark-right-inserting (current-point)))
|
|||
|
|
(m2 (mark-right-inserting (current-mark))))
|
|||
|
|
(let ((r1 (region-extract!
|
|||
|
|
(make-region (current-point)
|
|||
|
|
(mark1+ (current-point) 'ERROR))))
|
|||
|
|
(r2 (region-extract!
|
|||
|
|
(make-region (current-mark)
|
|||
|
|
(mark1+ (current-mark) 'ERROR)))))
|
|||
|
|
(region-insert! m1 r2)
|
|||
|
|
(region-insert! m2 r1))
|
|||
|
|
(set-current-point! m1)
|
|||
|
|
(set-current-mark! m2)))))
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|