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/*
* Copyright 2016 Google Inc. 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_MOZJS_CALLBACK_FUNCTION_CONVERSION_H_
#define COBALT_SCRIPT_MOZJS_CALLBACK_FUNCTION_CONVERSION_H_
#include "base/logging.h"
#include "cobalt/base/polymorphic_downcast.h"
#include "cobalt/script/logging_exception_state.h"
#include "cobalt/script/mozjs/conversion_helpers.h"
#include "cobalt/script/mozjs/mozjs_callback_function.h"
#include "cobalt/script/script_object.h"
#include "third_party/mozjs/js/src/jsapi.h"
namespace cobalt {
namespace script {
namespace mozjs {
// CallbackFunction -> JSValue
template <typename Signature>
void ToJSValue(
JSContext* context,
const ScriptObject<CallbackFunction<Signature> >* callback_function,
JS::MutableHandleValue out_value) {
if (!callback_function) {
out_value.set(JS::NullValue());
return;
}
// Downcast to MozjsUserObjectHolder<T> so we can get the underlying JSObject.
typedef MozjsUserObjectHolder<MozjsCallbackFunction<Signature> >
MozjsUserObjectHolderClass;
const MozjsUserObjectHolderClass* user_object_holder =
base::polymorphic_downcast<const MozjsUserObjectHolderClass*>(
callback_function);
DCHECK(user_object_holder->js_object());
out_value.set(OBJECT_TO_JSVAL(user_object_holder->js_object()));
}
// JSValue -> CallbackFunction
template <typename Signature>
void FromJSValue(JSContext* context, JS::HandleValue value,
int conversion_flags, ExceptionState* exception_state,
MozjsUserObjectHolder<MozjsCallbackFunction<Signature> >*
out_callback_function) {
typedef MozjsUserObjectHolder<MozjsCallbackFunction<Signature> >
MozjsCallbackHolderClass;
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
JS::RootedObject object(context);
if (value.isObject()) {
object = JSVAL_TO_OBJECT(value);
}
if (!object || !JS_ObjectIsFunction(context, object)) {
exception_state->SetSimpleException(kNotFunctionValue);
return;
}
MozjsGlobalEnvironment* global_environment =
static_cast<MozjsGlobalEnvironment*>(JS_GetContextPrivate(context));
*out_callback_function = MozjsCallbackHolderClass(
object, context, global_environment->wrapper_factory());
}
} // namespace mozjs
} // namespace script
} // namespace cobalt
#endif // COBALT_SCRIPT_MOZJS_CALLBACK_FUNCTION_CONVERSION_H_