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#ifndef InspectorHistory_h
32#define InspectorHistory_h
33
34#include "ExceptionCode.h"
35
36#include <wtf/Vector.h>
37#include <wtf/text/WTFString.h>
38
39namespace WebCore {
40
41class ContainerNode;
42class Element;
43class Node;
44
45#if ENABLE(INSPECTOR)
46
47class InspectorHistory {
48    WTF_MAKE_NONCOPYABLE(InspectorHistory); WTF_MAKE_FAST_ALLOCATED;
49public:
50    class Action {
51        WTF_MAKE_FAST_ALLOCATED;
52    public:
53        Action(const String& name);
54        virtual ~Action();
55        virtual String toString();
56
57        virtual String mergeId();
58        virtual void merge(std::unique_ptr<Action>);
59
60        virtual bool perform(ExceptionCode&) = 0;
61
62        virtual bool undo(ExceptionCode&) = 0;
63        virtual bool redo(ExceptionCode&) = 0;
64
65        virtual bool isUndoableStateMark();
66    private:
67        String m_name;
68    };
69
70    InspectorHistory();
71    virtual ~InspectorHistory();
72
73    bool perform(std::unique_ptr<Action>, ExceptionCode&);
74    void markUndoableState();
75
76    bool undo(ExceptionCode&);
77    bool redo(ExceptionCode&);
78    void reset();
79
80private:
81    Vector<std::unique_ptr<Action>> m_history;
82    size_t m_afterLastActionIndex;
83};
84
85#endif // ENABLE(INSPECTOR)
86
87} // namespace WebCore
88
89#endif // !defined(InspectorHistory_h)
90