[WIP] bindings: Introduce PropertyBag

Source/bindings/core/v8/DictionaryHelperForBindings.h

-/*
- * 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:
- *
- * 1.  Redistributions of source code must retain the above copyright
- *     notice, this list of conditions and the following disclaimer.
- * 2.  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.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS 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 APPLE OR ITS 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.
- */
-
-#ifndef DictionaryHelperForBindings_h
-#define DictionaryHelperForBindings_h
-
-#include "Source/bindings/core/v8/Dictionary.h"
-
-namespace blink {
-
-template <typename T>
-struct DictionaryHelperTraits {
-};
-
-template <template <typename> class PointerType, typename T>
-bool DictionaryHelper::get(const Dictionary& dictionary, const String& key, PointerType<T>& value)
-{
-    v8::Local<v8::Value> v8Value;
-    if (!dictionary.get(key, v8Value))
-        return false;
-
-    value = DictionaryHelperTraits<T>::type::toImplWithTypeCheck(dictionary.isolate(), v8Value);
-    return true;
-}
-
-template <template <typename> class PointerType, typename T>
-bool DictionaryHelper::convert(const Dictionary& dictionary, Dictionary::ConversionContext& context, const String& key, PointerType<T>& value)
-{
-    Dictionary::ConversionContextScope scope(context);
-
-    if (!DictionaryHelper::get(dictionary, key, value))
-        return true;
-
-    if (value)
-        return true;
-
-    v8::Local<v8::Value> v8Value;
-    dictionary.get(key, v8Value);
-    if (context.isNullable() && blink::isUndefinedOrNull(v8Value))
-        return true;
-
-    context.throwTypeError(ExceptionMessages::incorrectPropertyType(key, "does not have a " + context.typeName() + " type."));
-    return false;
-}
-
-} // namespace blink
-
-#endif // DictionaryHelperForBindings_h