100 lines
3 KiB
C++
100 lines
3 KiB
C++
// Copyright 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE.chromium file.
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#ifndef NATIVE_MATE_WRAPPABLE_H_
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#define NATIVE_MATE_WRAPPABLE_H_
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#include "base/bind.h"
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#include "gin/per_isolate_data.h"
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#include "native_mate/constructor.h"
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#include "native_mate/converter.h"
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namespace mate {
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namespace internal {
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void* FromV8Impl(v8::Isolate* isolate, v8::Local<v8::Value> val);
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} // namespace internal
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template <typename T>
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class Wrappable : public WrappableBase {
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public:
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Wrappable() {}
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template <typename Sig>
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static void SetConstructor(v8::Isolate* isolate,
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const base::Callback<Sig>& constructor) {
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v8::Local<v8::FunctionTemplate> templ = CreateFunctionTemplate(
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isolate, base::Bind(&internal::InvokeNew<Sig>, constructor));
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templ->InstanceTemplate()->SetInternalFieldCount(1);
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T::BuildPrototype(isolate, templ);
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gin::PerIsolateData::From(isolate)->SetFunctionTemplate(&kWrapperInfo,
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templ);
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}
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static v8::Local<v8::FunctionTemplate> GetConstructor(v8::Isolate* isolate) {
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// Fill the object template.
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auto* data = gin::PerIsolateData::From(isolate);
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auto templ = data->GetFunctionTemplate(&kWrapperInfo);
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if (templ.IsEmpty()) {
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templ = v8::FunctionTemplate::New(isolate);
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templ->InstanceTemplate()->SetInternalFieldCount(1);
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T::BuildPrototype(isolate, templ);
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data->SetFunctionTemplate(&kWrapperInfo, templ);
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}
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return templ;
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}
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protected:
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// Init the class with T::BuildPrototype.
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void Init(v8::Isolate* isolate) {
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v8::Local<v8::FunctionTemplate> templ = GetConstructor(isolate);
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// |wrapper| may be empty in some extreme cases, e.g., when
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// Object.prototype.constructor is overwritten.
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v8::Local<v8::Object> wrapper;
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if (!templ->InstanceTemplate()
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->NewInstance(isolate->GetCurrentContext())
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.ToLocal(&wrapper)) {
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// The current wrappable object will be no longer managed by V8. Delete
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// this now.
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delete this;
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return;
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}
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InitWith(isolate, wrapper);
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}
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private:
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static gin::WrapperInfo kWrapperInfo;
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DISALLOW_COPY_AND_ASSIGN(Wrappable);
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};
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// static
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template <typename T>
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gin::WrapperInfo Wrappable<T>::kWrapperInfo = {gin::kEmbedderNativeGin};
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// This converter handles any subclass of Wrappable.
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template <typename T>
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struct Converter<T*,
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typename std::enable_if<
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std::is_convertible<T*, WrappableBase*>::value>::type> {
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static v8::Local<v8::Value> ToV8(v8::Isolate* isolate, T* val) {
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if (val)
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return val->GetWrapper();
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else
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return v8::Null(isolate);
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}
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static bool FromV8(v8::Isolate* isolate, v8::Local<v8::Value> val, T** out) {
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*out = static_cast<T*>(
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static_cast<WrappableBase*>(internal::FromV8Impl(isolate, val)));
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return *out != nullptr;
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}
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};
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} // namespace mate
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#endif // NATIVE_MATE_WRAPPABLE_H_
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