implement_hello_world_module.md

Hello World 모듈 구현하기

• hello_world 디렉토리 생성

  • $ cd third_party/blink/renderer/modules && mkdir hello_world

• hello_world.idl 작성

  // Copyright 2018 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.
  
  [
    Exposed=Window
  ] interface HelloWorld {
    static readonly attribute DOMString hello;
  };

• hello_world.h 작성

  // Copyright 2018 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.
  
  #ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_FILE_HELLO_WORLD_H_
  #define THIRD_PARTY_BLINK_RENDERER_MODULES_FILE_HELLO_WORLD_H_
  
  #include "third_party/blink/renderer/modules/modules_export.h"
  #include "third_party/blink/renderer/platform/bindings/script_wrappable.h"
  #include "third_party/blink/renderer/platform/heap/handle.h"
  #include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
  
  namespace blink {
  
  class MODULES_EXPORT HelloWorld final : public ScriptWrappable {
    DEFINE_WRAPPERTYPEINFO();
  
   public:
    static String hello();
  
    void Trace(blink::Visitor* visitor) override;
  };
  
  }  // namespace blink
  
  #endif  // THIRD_PARTY_BLINK_RENDERER_MODULES_FILE_HELLO_WORLD_H_

• hello_world.cc 작성

  // Copyright 2018 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 "third_party/blink/renderer/modules/hello_world/hello_world.h"
  
  namespace blink {
  
  // static
  String HelloWorld::hello() {
    return String("World!");
  }
  
  void HelloWorld::Trace(blink::Visitor* visitor) {
    ScriptWrappable::Trace(visitor);
  }
  
  }  // namespace blink

• BUILD.gn 작성

  # Copyright 2018 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.
  
  import("//third_party/blink/renderer/modules/modules.gni")
  
  blink_modules_sources("hello_world") {
    sources = [
      "hello_world.cc",
      "hello_world.h",
    ]
  }

• module 추가

  # //third_party/blink/renderer/modules/BUILD.gn에서 deps를 수정
  "//third_party/blink/renderer/modules/hello_world",
  

• idl 추가

  # //third_party/blink/renderer/modules/modules_idl_files.gni에서 modules_idl_files를 수정
  "hello_world/hello_world.idl",
  

• 빌드하기

  • $ gn args out/Debug
  • $ ninja -C out/Debug chrome

• 실행해서 테스트

  • $ ./out/Debug/chrome