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// Copyright 2017 The Cobalt Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef COBALT_SCRIPT_V8C_CALLBACK_FUNCTION_CONVERSION_H_
#define COBALT_SCRIPT_V8C_CALLBACK_FUNCTION_CONVERSION_H_
#include "base/logging.h"
#include "cobalt/base/polymorphic_downcast.h"
#include "cobalt/script/logging_exception_state.h"
#include "cobalt/script/script_value.h"
#include "cobalt/script/v8c/conversion_helpers.h"
#include "cobalt/script/v8c/v8c_callback_function.h"
#include "v8/include/v8.h"
namespace cobalt {
namespace script {
namespace v8c {
// CallbackFunction -> JSValue
template <typename Signature>
void ToJSValue(
v8::Isolate* isolate,
const ScriptValue<CallbackFunction<Signature>>* callback_function,
v8::Local<v8::Value>* out_value) {
if (!callback_function) {
*out_value = v8::Null(isolate);
return;
}
// Downcast to V8cUserObjectHolder<T> so we can get the underlying v8::Object.
typedef V8cUserObjectHolder<V8cCallbackFunction<Signature>>
V8cUserObjectHolderClass;
const V8cUserObjectHolderClass* user_object_holder =
base::polymorphic_downcast<const V8cUserObjectHolderClass*>(
callback_function);
*out_value = user_object_holder->v8_value();
}
// JSValue -> CallbackFunction
template <typename Signature>
inline void FromJSValue(v8::Isolate* isolate, v8::Local<v8::Value> value,
int conversion_flags, ExceptionState* exception_state,
V8cUserObjectHolder<V8cCallbackFunction<Signature>>*
out_callback_function) {
typedef V8cUserObjectHolder<V8cCallbackFunction<Signature>>
V8cCallbackHolderClass;
DCHECK_EQ(conversion_flags & ~kConversionFlagsCallbackFunction, 0)
<< "Unexpected conversion flags.";
if (value->IsNull()) {
if (!(conversion_flags & kConversionFlagNullable)) {
exception_state->SetSimpleException(kNotNullableType);
}
// If it is a nullable type, just return.
return;
}
// https://www.w3.org/TR/WebIDL/#es-callback-function
// 1. If V is not a Function object, throw a TypeError
if (!value->IsFunction()) {
exception_state->SetSimpleException(kNotFunctionValue);
return;
}
*out_callback_function = V8cCallbackHolderClass(isolate, value);
}
} // namespace v8c
} // namespace script
} // namespace cobalt
#endif // COBALT_SCRIPT_V8C_CALLBACK_FUNCTION_CONVERSION_H_