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/*
* Copyright (C) 2012 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "InspectorHistory.h"
#include "Node.h"
namespace WebCore {
class UndoableStateMark : public InspectorHistory::Action {
private:
ExceptionOr<void> perform() final { return { }; }
ExceptionOr<void> undo() final { return { }; }
ExceptionOr<void> redo() final { return { }; }
bool isUndoableStateMark() final { return true; }
};
ExceptionOr<void> InspectorHistory::perform(std::unique_ptr<Action> action)
{
auto performResult = action->perform();
if (performResult.hasException())
return performResult.releaseException();
if (!action->mergeId().isEmpty() && m_afterLastActionIndex > 0 && action->mergeId() == m_history[m_afterLastActionIndex - 1]->mergeId())
m_history[m_afterLastActionIndex - 1]->merge(WTFMove(action));
else {
m_history.resize(m_afterLastActionIndex);
m_history.append(WTFMove(action));
++m_afterLastActionIndex;
}
return { };
}
void InspectorHistory::markUndoableState()
{
perform(makeUnique<UndoableStateMark>());
}
ExceptionOr<void> InspectorHistory::undo()
{
while (m_afterLastActionIndex > 0 && m_history[m_afterLastActionIndex - 1]->isUndoableStateMark())
--m_afterLastActionIndex;
while (m_afterLastActionIndex > 0) {
Action* action = m_history[m_afterLastActionIndex - 1].get();
auto undoResult = action->undo();
if (undoResult.hasException()) {
reset();
return undoResult.releaseException();
}
--m_afterLastActionIndex;
if (action->isUndoableStateMark())
break;
}
return { };
}
ExceptionOr<void> InspectorHistory::redo()
{
while (m_afterLastActionIndex < m_history.size() && m_history[m_afterLastActionIndex]->isUndoableStateMark())
++m_afterLastActionIndex;
while (m_afterLastActionIndex < m_history.size()) {
Action* action = m_history[m_afterLastActionIndex].get();
auto redoResult = action->redo();
if (redoResult.hasException()) {
reset();
return redoResult.releaseException();
}
++m_afterLastActionIndex;
if (action->isUndoableStateMark())
break;
}
return { };
}
void InspectorHistory::reset()
{
m_afterLastActionIndex = 0;
m_history.clear();
}
} // namespace WebCore
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