[WIP Prototype] ES6 https://html.spec.whatwg.org/#fetch-a-single-module-script implementation

third_party/WebKit/Source/bindings/core/v8/ModuleController.cpp

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "bindings/core/v8/ModuleController.h"
+
+#include "bindings/core/v8/ScriptModule.h"
+#include "bindings/core/v8/V8PerIsolateData.h"
+#include <v8.h>
+
+namespace blink {
+
+ModuleController::ModuleController(RefPtr<ScriptState> scriptState)

[haraken, 2017/01/06 05:47:58]

It seems to me that ModuleController is an unnecessary abstraction. Can we make
Modulator hold RefPtr<ScriptState> and move the logic in ModuleController into
ScriptModule?

[kouhei (in TOK), 2017/01/11 01:41:57]

Done.

+    : m_scriptState(std::move(scriptState)) {
+  DCHECK(m_scriptState);
+}
+
+ModuleController::~ModuleController() {}
+
+ScriptModule ModuleController::compileModule(const String& script,
+                                             const String& urlStr) {
+  v8::Isolate* isolate = V8PerIsolateData::mainThreadIsolate();
+  v8::HandleScope handleScope(isolate);
+
+  ScriptState::Scope scope(m_scriptState.get());
+  return ScriptModule::compile(isolate, script, urlStr);
+}
+
+bool ModuleController::instantiateModule(ScriptModule scriptModule) {
+  v8::Isolate* isolate = V8PerIsolateData::mainThreadIsolate();
+  v8::HandleScope handleScope(isolate);
+
+  ScriptState::Scope scope(m_scriptState.get());
+  return scriptModule.instantiate(m_scriptState.get());
+}
+
+Vector<String> ModuleController::moduleRequestsFromScriptModule(
+    ScriptModule scriptModule) {
+  v8::Isolate* isolate = V8PerIsolateData::mainThreadIsolate();
+  v8::HandleScope handleScope(isolate);
+
+  ScriptState::Scope scope(m_scriptState.get());
+  return scriptModule.moduleRequests(m_scriptState.get());
+}
+
+void ModuleController::executeModule(ScriptModule scriptModule) {
+  v8::Isolate* isolate = V8PerIsolateData::mainThreadIsolate();
+  v8::HandleScope handleScope(isolate);
+
+  ScriptState::Scope scope(m_scriptState.get());
+
+  v8::MicrotasksScope microtasksScope(isolate,
+                                      v8::MicrotasksScope::kRunMicrotasks);
+  scriptModule.evaluate(m_scriptState.get());
+}
+
+}  // namespace blink