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