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/*
* Copyright (C) 2012-2017 Robin Haberkorn
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <bsd/sys/queue.h>
#include <glib.h>
#include <glib/gstdio.h>
#include <Scintilla.h>
#include "sciteco.h"
#include "cmdline.h"
#include "undo.h"
namespace SciTECO {
//#define DEBUG
UndoStack undo;
void
UndoStack::push(UndoToken *token)
{
/*
* All undo token allocations should take place using the
* variadic template version of UndoStack::push(), so we
* don't have to check `enabled` here.
*/
g_assert(enabled == true);
#ifdef DEBUG
g_printf("UNDO PUSH %p\n", token);
#endif
token->pc = cmdline.pc;
SLIST_INSERT_HEAD(&head, token, tokens);
}
void
UndoStack::pop(gint pc)
{
while (!SLIST_EMPTY(&head) && SLIST_FIRST(&head)->pc >= pc) {
UndoToken *top = SLIST_FIRST(&head);
#ifdef DEBUG
g_printf("UNDO POP %p\n", top);
fflush(stdout);
#endif
top->run();
SLIST_REMOVE_HEAD(&head, tokens);
delete top;
}
}
void
UndoStack::clear(void)
{
UndoToken *cur;
while ((cur = SLIST_FIRST(&head))) {
SLIST_REMOVE_HEAD(&head, tokens);
delete cur;
}
}
UndoStack::~UndoStack()
{
UndoToken *token, *next;
SLIST_FOREACH_SAFE(token, &head, tokens, next)
delete token;
}
} /* namespace SciTECO */
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