text: // Copyright (c) 2013 GitHub, Inc. All rights reserved.
  // Use of this source code is governed by the MIT license that can be
  // found in the LICENSE file.
  
  #include "atom/renderer/api/atom_renderer_bindings.h"
  
  #include <vector>
  
  #include "atom/common/native_mate_converters/string16_converter.h"
  #include "atom/common/native_mate_converters/v8_value_converter.h"
  #include "base/memory/scoped_ptr.h"
  #include "base/values.h"
  #include "content/public/renderer/render_view.h"
  #include "third_party/WebKit/public/web/WebFrame.h"
  #include "third_party/WebKit/public/web/WebView.h"
  
  #include "atom/common/node_includes.h"
  
  namespace atom {
  
  namespace {
  
  v8::Handle<v8::Object> GetProcessObject(v8::Handle<v8::Context> context) {
    v8::Handle<v8::Object> process =
        context->Global()->Get(v8::String::New("process"))->ToObject();
    DCHECK(!process.IsEmpty());
  
    return process;
  }
  
  }  // namespace
  
  AtomRendererBindings::AtomRendererBindings() {
  }
  
  AtomRendererBindings::~AtomRendererBindings() {
  }
  
  void AtomRendererBindings::BindToFrame(WebKit::WebFrame* frame) {
    v8::HandleScope handle_scope(node_isolate);
  
    v8::Handle<v8::Context> context = frame->mainWorldScriptContext();
    if (context.IsEmpty())
      return;
  
    v8::Context::Scope scope(context);
    AtomBindings::BindTo(GetProcessObject(context));
  }
  
  void AtomRendererBindings::OnBrowserMessage(content::RenderView* render_view,
                                              const string16& channel,
                                              const base::ListValue& args) {
    if (!render_view->GetWebView())
      return;
  
    v8::HandleScope handle_scope(node_isolate);
  
    v8::Local<v8::Context> context =
        render_view->GetWebView()->mainFrame()->mainWorldScriptContext();
    if (context.IsEmpty())
      return;
  
    v8::Context::Scope context_scope(context);
  
    v8::Handle<v8::Object> process = GetProcessObject(context);
    scoped_ptr<V8ValueConverter> converter(new V8ValueConverter);
  
    std::vector<v8::Handle<v8::Value>> arguments;
    arguments.reserve(1 + args.GetSize());
    arguments.push_back(mate::ConvertToV8(node_isolate, channel));
  
    for (size_t i = 0; i < args.GetSize(); i++) {
      const base::Value* value;
      if (args.Get(i, &value))
        arguments.push_back(converter->ToV8Value(value, context));
    }
  
    node::MakeCallback(process, "emit", arguments.size(), &arguments[0]);
  }
  
  }  // namespace atom
  