/* * 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" #include "V8Proxy.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()); // 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.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