Add gin, a lightweight bindings system for V8

gin/runner.cc

+// Copyright 2013 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 "gin/runner.h"
+
+#include "gin/converter.h"
+
+using v8::Context;
+using v8::Function;
+using v8::Handle;
+using v8::HandleScope;
+using v8::Isolate;
+using v8::Local;
+using v8::Object;
+using v8::Script;
+using v8::String;
+using v8::Value;
+
+namespace gin {
+
+RunnerDelegate::~RunnerDelegate() {
+}
+
+Runner::Runner(RunnerDelegate* delegate, Isolate* isolate)
+    : delegate_(delegate),
+      isolate_(isolate) {
+  HandleScope handle_scope(isolate_);
+  context_.Reset(isolate_, Context::New(isolate_));
+}
+
+Runner::~Runner() {
+  // TODO(abarth): Figure out how to set kResetInDestructor to true.
+  context_.Reset();
+}
+
+void Runner::Run(Handle<Script> script) {
+  script->Run();
+  Handle<Function> main = GetMain();
+  if (main.IsEmpty())
+    return;
+  Handle<Value> argv[] = { delegate_->CreateRootObject(this) };
+  main->Call(global(), 1, argv);
+}
+
+v8::Handle<v8::Function> Runner::GetMain() {
+  Handle<Value> property = global()->Get(StringToV8(isolate_, "main"));
+  if (property.IsEmpty())
+    return v8::Handle<v8::Function>();
+  Handle<Function> main;
+  if (!ConvertFromV8(property, &main))
+    return v8::Handle<v8::Function>();
+  return main;
+}
+
+Runner::Scope::Scope(Runner* runner)
+  : handle_scope_(runner->isolate_),
+    scope_(Local<Context>::New(runner->isolate_, runner->context_)) {
+}
+
+Runner::Scope::~Scope() {
+}
+
+}  // namespace gin