void V8MessageEvent::dataAttributeGetterCustom(
const v8::FunctionCallbackInfo<v8::Value>& info) {
ScriptState* scriptState = ScriptState::current(info.GetIsolate());
auto privateCachedData =
V8PrivateProperty::getMessageEventCachedData(info.GetIsolate());
v8::Local<v8::Value> cachedData =
privateCachedData.get(scriptState->context(), info.Holder());
if (!cachedData.IsEmpty()) {
v8SetReturnValue(info, cachedData);
return;
}
MessageEvent* event = V8MessageEvent::toImpl(info.Holder());
v8::Local<v8::Value> result;
switch (event->getDataType()) {
case MessageEvent::DataTypeScriptValue:
result = event->dataAsScriptValue().v8ValueFor(scriptState);
if (result.IsEmpty())
result = v8::Null(info.GetIsolate());
break;
case MessageEvent::DataTypeSerializedScriptValue:
if (SerializedScriptValue* serializedValue =
event->dataAsSerializedScriptValue()) {
MessagePortArray ports = event->ports();
result = serializedValue->deserialize(info.GetIsolate(), &ports);
} else {
result = v8::Null(info.GetIsolate());
}
break;
case MessageEvent::DataTypeString:
result = v8String(info.GetIsolate(), event->dataAsString());
break;
case MessageEvent::DataTypeBlob:
result = toV8(event->dataAsBlob(), info.Holder(), info.GetIsolate());
break;
case MessageEvent::DataTypeArrayBuffer:
result =
toV8(event->dataAsArrayBuffer(), info.Holder(), info.GetIsolate());
break;
}
// Store the result as a private value so this callback returns the cached
// result in future invocations.
privateCachedData.set(scriptState->context(), info.Holder(), result);
v8SetReturnValue(info, result);
}
v8::Handle<v8::Value> V8MessageEvent::dataAccessorGetter(v8::Local<v8::String> name, const v8::AccessorInfo& info)
{
INC_STATS("DOM.MessageEvent.data");
MessageEvent* event = V8MessageEvent::toNative(info.Holder());
v8::Handle<v8::Value> result;
switch (event->dataType()) {
case MessageEvent::DataTypeScriptValue: {
ScriptValue scriptValue = event->dataAsScriptValue();
if (scriptValue.hasNoValue())
result = v8::Null();
else
result = scriptValue.v8Value();
break;
}
case MessageEvent::DataTypeSerializedScriptValue:
if (SerializedScriptValue* serializedValue = event->dataAsSerializedScriptValue())
result = serializedValue->deserialize(event->ports());
else
result = v8::Null();
break;
case MessageEvent::DataTypeString: {
String stringValue = event->dataAsString();
result = v8::String::New(fromWebCoreString(stringValue), stringValue.length());
break;
}
case MessageEvent::DataTypeBlob:
result = toV8(event->dataAsBlob());
break;
case MessageEvent::DataTypeArrayBuffer:
result = toV8(event->dataAsArrayBuffer());
break;
}
// Overwrite the data attribute so it returns the cached result in future invocations.
// This custom handler (dataAccessGetter) will not be called again.
v8::PropertyAttribute dataAttr = static_cast<v8::PropertyAttribute>(v8::DontDelete | v8::ReadOnly);
info.Holder()->ForceSet(name, result, dataAttr);
return result;
}
JSValue JSMessageEvent::data(ExecState* exec) const
{
if (JSValue cachedValue = m_data.get())
return cachedValue;
MessageEvent* event = static_cast<MessageEvent*>(impl());
JSValue result;
switch (event->dataType()) {
case MessageEvent::DataTypeScriptValue: {
ScriptValue scriptValue = event->dataAsScriptValue();
if (scriptValue.hasNoValue())
result = jsNull();
else
result = scriptValue.jsValue();
break;
}
case MessageEvent::DataTypeSerializedScriptValue:
if (RefPtr<SerializedScriptValue> serializedValue = event->dataAsSerializedScriptValue()) {
MessagePortArray ports = static_cast<MessageEvent*>(impl())->ports();
result = serializedValue->deserialize(exec, globalObject(), &ports, NonThrowing);
}
else
result = jsNull();
break;
case MessageEvent::DataTypeString:
result = jsStringWithCache(exec, event->dataAsString());
break;
case MessageEvent::DataTypeBlob:
result = toJS(exec, globalObject(), event->dataAsBlob());
break;
case MessageEvent::DataTypeArrayBuffer:
result = toJS(exec, globalObject(), event->dataAsArrayBuffer());
break;
}
// Save the result so we don't have to deserialize the value again.
const_cast<JSMessageEvent*>(this)->m_data.set(exec->vm(), this, result);
return result;
}
