1/*
2 * Copyright (C) 2012 Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 * * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#pragma once
32
33#include "ExceptionOr.h"
34#include <wtf/Vector.h>
35
36namespace WebCore {
37
38class InspectorHistory final {
39 WTF_MAKE_NONCOPYABLE(InspectorHistory);
40 WTF_MAKE_FAST_ALLOCATED;
41public:
42 class Action {
43 WTF_MAKE_FAST_ALLOCATED;
44 public:
45 virtual ~Action() = default;
46
47 virtual String mergeId() { return emptyString(); }
48 virtual void merge(std::unique_ptr<Action>) { };
49
50 virtual ExceptionOr<void> perform() = 0;
51
52 virtual ExceptionOr<void> undo() = 0;
53 virtual ExceptionOr<void> redo() = 0;
54
55 virtual bool isUndoableStateMark() { return false; }
56
57 private:
58 String m_name;
59 };
60
61 InspectorHistory() = default;
62
63 ExceptionOr<void> perform(std::unique_ptr<Action>);
64 void markUndoableState();
65
66 ExceptionOr<void> undo();
67 ExceptionOr<void> redo();
68 void reset();
69
70private:
71 Vector<std::unique_ptr<Action>> m_history;
72 size_t m_afterLastActionIndex { 0 };
73};
74
75} // namespace WebCore
76