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      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 #include "config.h"
     32 #include "core/inspector/InspectorHistory.h"
     33 
     34 #include "bindings/v8/ExceptionState.h"
     35 #include "bindings/v8/ExceptionStatePlaceholder.h"
     36 #include "core/dom/Node.h"
     37 
     38 namespace WebCore {
     39 
     40 namespace {
     41 
     42 class UndoableStateMark FINAL : public InspectorHistory::Action {
     43 public:
     44     UndoableStateMark() : InspectorHistory::Action("[UndoableState]") { }
     45 
     46     virtual bool perform(ExceptionState&) OVERRIDE { return true; }
     47 
     48     virtual bool undo(ExceptionState&) OVERRIDE { return true; }
     49 
     50     virtual bool redo(ExceptionState&) OVERRIDE { return true; }
     51 
     52     virtual bool isUndoableStateMark() OVERRIDE { return true; }
     53 };
     54 
     55 }
     56 
     57 InspectorHistory::Action::Action(const String& name) : m_name(name)
     58 {
     59 }
     60 
     61 InspectorHistory::Action::~Action()
     62 {
     63 }
     64 
     65 void InspectorHistory::Action::trace(Visitor* visitor)
     66 {
     67 }
     68 
     69 String InspectorHistory::Action::toString()
     70 {
     71     return m_name;
     72 }
     73 
     74 bool InspectorHistory::Action::isUndoableStateMark()
     75 {
     76     return false;
     77 }
     78 
     79 String InspectorHistory::Action::mergeId()
     80 {
     81     return "";
     82 }
     83 
     84 void InspectorHistory::Action::merge(PassRefPtrWillBeRawPtr<Action>)
     85 {
     86 }
     87 
     88 InspectorHistory::InspectorHistory() : m_afterLastActionIndex(0) { }
     89 
     90 bool InspectorHistory::perform(PassRefPtrWillBeRawPtr<Action> action, ExceptionState& exceptionState)
     91 {
     92     if (!action->perform(exceptionState))
     93         return false;
     94 
     95     if (!action->mergeId().isEmpty() && m_afterLastActionIndex > 0 && action->mergeId() == m_history[m_afterLastActionIndex - 1]->mergeId())
     96         m_history[m_afterLastActionIndex - 1]->merge(action);
     97     else {
     98         m_history.resize(m_afterLastActionIndex);
     99         m_history.append(action);
    100         ++m_afterLastActionIndex;
    101     }
    102     return true;
    103 }
    104 
    105 void InspectorHistory::markUndoableState()
    106 {
    107     perform(adoptRefWillBeNoop(new UndoableStateMark()), IGNORE_EXCEPTION);
    108 }
    109 
    110 bool InspectorHistory::undo(ExceptionState& exceptionState)
    111 {
    112     while (m_afterLastActionIndex > 0 && m_history[m_afterLastActionIndex - 1]->isUndoableStateMark())
    113         --m_afterLastActionIndex;
    114 
    115     while (m_afterLastActionIndex > 0) {
    116         Action* action = m_history[m_afterLastActionIndex - 1].get();
    117         if (!action->undo(exceptionState)) {
    118             reset();
    119             return false;
    120         }
    121         --m_afterLastActionIndex;
    122         if (action->isUndoableStateMark())
    123             break;
    124     }
    125 
    126     return true;
    127 }
    128 
    129 bool InspectorHistory::redo(ExceptionState& exceptionState)
    130 {
    131     while (m_afterLastActionIndex < m_history.size() && m_history[m_afterLastActionIndex]->isUndoableStateMark())
    132         ++m_afterLastActionIndex;
    133 
    134     while (m_afterLastActionIndex < m_history.size()) {
    135         Action* action = m_history[m_afterLastActionIndex].get();
    136         if (!action->redo(exceptionState)) {
    137             reset();
    138             return false;
    139         }
    140         ++m_afterLastActionIndex;
    141         if (action->isUndoableStateMark())
    142             break;
    143     }
    144     return true;
    145 }
    146 
    147 void InspectorHistory::reset()
    148 {
    149     m_afterLastActionIndex = 0;
    150     m_history.clear();
    151 }
    152 
    153 void InspectorHistory::trace(Visitor* visitor)
    154 {
    155     visitor->trace(m_history);
    156 }
    157 
    158 } // namespace WebCore
    159 
    160