blob: 857c32da88bd58fb1cb88111539eef421ec8cdea [file] [log] [blame]
/*
* 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 "core/inspector/InspectorHistory.h"
#include "bindings/core/v8/ExceptionState.h"
#include "core/dom/Node.h"
namespace blink {
namespace {
class UndoableStateMark final : public InspectorHistory::Action {
public:
UndoableStateMark() : InspectorHistory::Action("[UndoableState]") {}
bool Perform(ExceptionState&) override { return true; }
bool Undo(ExceptionState&) override { return true; }
bool Redo(ExceptionState&) override { return true; }
bool IsUndoableStateMark() override { return true; }
};
} // namespace
InspectorHistory::Action::Action(const String& name) : name_(name) {}
InspectorHistory::Action::~Action() = default;
void InspectorHistory::Action::Trace(blink::Visitor* visitor) {}
String InspectorHistory::Action::ToString() {
return name_;
}
bool InspectorHistory::Action::IsUndoableStateMark() {
return false;
}
String InspectorHistory::Action::MergeId() {
return "";
}
void InspectorHistory::Action::Merge(Action*) {}
InspectorHistory::InspectorHistory() : after_last_action_index_(0) {}
bool InspectorHistory::Perform(Action* action,
ExceptionState& exception_state) {
if (!action->Perform(exception_state))
return false;
AppendPerformedAction(action);
return true;
}
void InspectorHistory::AppendPerformedAction(Action* action) {
if (!action->MergeId().IsEmpty() && after_last_action_index_ > 0 &&
action->MergeId() == history_[after_last_action_index_ - 1]->MergeId()) {
history_[after_last_action_index_ - 1]->Merge(action);
if (history_[after_last_action_index_ - 1]->IsNoop())
--after_last_action_index_;
history_.resize(after_last_action_index_);
} else {
history_.resize(after_last_action_index_);
history_.push_back(action);
++after_last_action_index_;
}
}
void InspectorHistory::MarkUndoableState() {
Perform(new UndoableStateMark(), IGNORE_EXCEPTION_FOR_TESTING);
}
bool InspectorHistory::Undo(ExceptionState& exception_state) {
while (after_last_action_index_ > 0 &&
history_[after_last_action_index_ - 1]->IsUndoableStateMark())
--after_last_action_index_;
while (after_last_action_index_ > 0) {
Action* action = history_[after_last_action_index_ - 1].Get();
if (!action->Undo(exception_state)) {
Reset();
return false;
}
--after_last_action_index_;
if (action->IsUndoableStateMark())
break;
}
return true;
}
bool InspectorHistory::Redo(ExceptionState& exception_state) {
while (after_last_action_index_ < history_.size() &&
history_[after_last_action_index_]->IsUndoableStateMark())
++after_last_action_index_;
while (after_last_action_index_ < history_.size()) {
Action* action = history_[after_last_action_index_].Get();
if (!action->Redo(exception_state)) {
Reset();
return false;
}
++after_last_action_index_;
if (action->IsUndoableStateMark())
break;
}
return true;
}
void InspectorHistory::Reset() {
after_last_action_index_ = 0;
history_.clear();
}
void InspectorHistory::Trace(blink::Visitor* visitor) {
visitor->Trace(history_);
}
} // namespace blink