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external_extension.cc

// Copyright (c) 2009 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 "chrome/renderer/external_extension.h"
#include "chrome/renderer/render_view.h"
#include "third_party/WebKit/WebKit/chromium/public/WebFrame.h"

using WebKit::WebFrame;
using WebKit::WebView;

namespace extensions_v8 {

const char* const kExternalExtensionName = "v8/External";

class ExternalExtensionWrapper : public v8::Extension {
 public:
  ExternalExtensionWrapper()
      : v8::Extension(
            kExternalExtensionName,
            "var external;"
            "if (!external)"
            "  external = {};"
            "external.AddSearchProvider = function(name) {"
            "  native function NativeAddSearchProvider();"
            "  NativeAddSearchProvider(name);"
            "}") {
  }

  virtual v8::Handle<v8::FunctionTemplate> GetNativeFunction(
      v8::Handle<v8::String> name) {
    if (name->Equals(v8::String::New("NativeAddSearchProvider"))) {
      return v8::FunctionTemplate::New(AddSearchProvider);
    }
    return v8::Handle<v8::FunctionTemplate>();
  }

  static v8::Handle<v8::Value> AddSearchProvider(const v8::Arguments& args) {
    if (!args.Length())
      return v8::Undefined();

    WebFrame* webframe = WebFrame::frameForEnteredContext();
    DCHECK(webframe) << "There should be an active frame since we just got "
                        "a native function called.";
    if (!webframe) return v8::Undefined();

    WebView* webview = webframe->view();
    if (!webview) return v8::Undefined();  // can happen during closing

    RenderView* renderview = RenderView::FromWebView(webview);
    if (!renderview) return v8::Undefined();

    std::string name = std::string(*v8::String::Utf8Value(args[0]));
    if (!name.length()) return v8::Undefined();

    renderview->AddSearchProvider(name);
    return v8::Undefined();
  }
};

v8::Extension*  ExternalExtension::Get() {
  return new ExternalExtensionWrapper();
}

}  // namespace extensions_v8

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