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