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/*
* Copyright (C) 2010 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 "config.h"
#include "V8PopStateEvent.h"
#include "History.h"
#include "PopStateEvent.h"
#include "SerializedScriptValue.h"
#include "V8HiddenPropertyName.h"
#include "V8History.h"
namespace WebCore {
// Save the state value to a hidden attribute in the V8PopStateEvent, and return it, for convenience.
static v8::Handle<v8::Value> cacheState(v8::Handle<v8::Object> popStateEvent, v8::Handle<v8::Value> state)
{
popStateEvent->SetHiddenValue(V8HiddenPropertyName::state(), state);
return state;
}
v8::Handle<v8::Value> V8PopStateEvent::stateAccessorGetter(v8::Local<v8::String> name, const v8::AccessorInfo& info)
{
INC_STATS("DOM.PopStateEvent.state");
v8::Handle<v8::Value> result = info.Holder()->GetHiddenValue(V8HiddenPropertyName::state());
if (!result.IsEmpty())
return result;
PopStateEvent* event = V8PopStateEvent::toNative(info.Holder());
if (!event->state().hasNoValue())
return cacheState(info.Holder(), event->state().v8Value());
History* history = event->history();
if (!history || !event->serializedState())
return cacheState(info.Holder(), v8::Null(info.GetIsolate()));
// There's no cached value from a previous invocation, nor a state value was provided by the
// event, but there is a history object, so first we need to see if the state object has been
// deserialized through the history object already.
// The current history state object might've changed in the meantime, so we need to take care
// of using the correct one, and always share the same deserialization with history.state.
bool isSameState = history->isSameAsCurrentState(event->serializedState());
if (isSameState) {
v8::Handle<v8::Object> v8History = toV8(history, info.Holder(), info.GetIsolate()).As<v8::Object>();
if (!history->stateChanged()) {
result = v8History->GetHiddenValue(V8HiddenPropertyName::state());
if (!result.IsEmpty())
return cacheState(info.Holder(), result);
}
result = event->serializedState()->deserialize(0, info.GetIsolate());
v8History->SetHiddenValue(V8HiddenPropertyName::state(), result);
} else
result = event->serializedState()->deserialize(0, info.GetIsolate());
return cacheState(info.Holder(), result);
}
} // namespace WebCore
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