151 lines
4.6 KiB
C
151 lines
4.6 KiB
C
/*
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* CDE - Common Desktop Environment
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*
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* Copyright (c) 1993-2012, The Open Group. All rights reserved.
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*
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* These libraries and programs are free software; you can
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* redistribute them and/or modify them under the terms of the GNU
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* Lesser General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* These libraries and programs are distributed in the hope that
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* they will be useful, but WITHOUT ANY WARRANTY; without even the
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* implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU Lesser General Public License for more
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* details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with these librararies and programs; if not, write
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* to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
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* Floor, Boston, MA 02110-1301 USA
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*/
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//%% (c) Copyright 1993, 1994 Hewlett-Packard Company
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//%% (c) Copyright 1993, 1994 International Business Machines Corp.
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//%% (c) Copyright 1993, 1994 Sun Microsystems, Inc.
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//%% (c) Copyright 1993, 1994 Novell, Inc.
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//%% $XConsortium: CoEdChangeHistory.C /main/3 1995/10/20 17:06:11 rswiston $
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/*
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* CoEdChangeHistory.cc
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*
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* Copyright (c) 1991 by Sun Microsystems. All Rights Reserved.
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*
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* Permission to use, copy, modify, distribute, and sell this software
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* and its documentation for any purpose is hereby granted without
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* fee, provided that the above copyright notice appear in all copies
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* and that both that copyright notice and this permission notice
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* appear in supporting documentation, and that the names of Sun
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* Microsystems and its subsidiaries not be used in advertising or
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* publicity pertaining to distribution of the software without
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* specific, written prior permission. Sun Microsystems and its
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* subsidiaries make no representations about the suitability of this
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* software for any purpose. It is provided "as is" without express
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* or implied warranty.
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*
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* Sun Microsystems and its subsidiaries disclaim all warranties with
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* regard to this software, including all implied warranties of
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* merchantability and fitness. In no event shall Sun Microsystems or
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* its subsidiaries be liable for any special, indirect or
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* consequential damages or any damages whatsoever resulting from loss
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* of use, data or profits, whether in an action of contract,
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* negligence or other tortious action, arising out of or in
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* connection with the use or performance of this software.
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*/
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#include <string.h>
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#include "CoEdChangeHistory.h"
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CoEdChangeHistory::
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CoEdChangeHistory() : CoEdTextChangeList()
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{
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}
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void CoEdChangeHistory::
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insert( CoEdTextChange *change )
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{
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CoEdTextChange *curr = _tail;
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//
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// Find the most recent change in the history that the
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// incoming change knows of.
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//
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while (curr != 0) {
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if (change->knowsOf( *curr )) {
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break;
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}
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curr = curr->_prev;
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}
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//
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// Bump curr to point to the first change that the incoming
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// change doesn't know of.
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//
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if (curr == 0) {
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curr = _head;
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} else {
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curr = curr->_next;
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}
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//
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// The rest of the changes are mutually ignorant with the incoming
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// change. Find the first one with a greater site id, and
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// stick this change in front of it.
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//
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while (curr != 0) {
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if (*change->_causer < *curr->_causer) {
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break;
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}
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curr = curr->_next;
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}
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if (curr == 0) {
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append( change );
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} else {
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insertBefore( change, curr );
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}
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}
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CoEdTextChange *CoEdChangeHistory::
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translate( CoEdTextChange &change )
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{
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_translateOverEarlierChgs( change );
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return _translateOverLaterChgs( change );
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}
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//
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// Modify <change> so that it takes into account any changes ahead of
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// it in the change history that it does not know about.
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//
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void CoEdChangeHistory::
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_translateOverEarlierChgs( CoEdTextChange &change )
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{
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CoEdTextChange *curr = _head;
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while (curr != &change) {
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if (! change.knowsOf( *curr )) {
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change.translateOver( *curr );
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}
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curr = curr->_next;
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}
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}
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//
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// Take <change>, which is assumed to have been inserted into this
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// ChangeHistory, and adjust the remaining changes in the history
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// so that they take into account the change inserted ahead of them.
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// Also, return a new CoEdTextChange that is a translated version
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// of <change>, suitable for application to a textbuffer that
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// has already had the remaining changes in the history applied to it.
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//
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CoEdTextChange *CoEdChangeHistory::
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_translateOverLaterChgs( const CoEdTextChange &change )
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{
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CoEdTextChange *xlatdChng = new CoEdTextChange( change );
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if (xlatdChng == 0) {
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return 0;
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}
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CoEdTextChange *curr = change._next;
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while (curr != 0) {
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curr->interTranslate( *xlatdChng );
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curr = curr->_next;
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}
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return xlatdChng;
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}
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