71 lines
2.7 KiB
Scheme
71 lines
2.7 KiB
Scheme
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;;;
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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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;;;; Kill Commands
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(define append-next-kill-tag "Append Next Kill")
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(define (delete-region mark)
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(if (not mark) (editor-error "Delete exceeds buffer bounds"))
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(region-delete! (make-region (current-point) mark)))
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(define (kill-region mark)
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(if (not mark) (editor-error "Kill exceeds buffer bounds"))
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(let* ((point (current-point))
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(forward? (mark<= point mark)))
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(%kill-region (region-extract! (make-region point mark)) forward?)))
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(define (%kill-region region forward?)
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(let ((ring (current-kill-ring)))
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(command-message-receive append-next-kill-tag
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(lambda ()
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(if (ring-empty? ring) (editor-error "No previous kill"))
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(region-insert! ((if forward? region-end region-start)
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(ring-ref ring 0))
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region))
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(lambda ()
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(ring-push! ring region))))
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(set-command-message! append-next-kill-tag))
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(define (un-kill-region region)
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(set-current-region! (region-insert (current-point) region)))
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