refactor: rename the atom directory to shell

shell/common/native_mate_converters/once_callback.h

@@ -0,0 +1,87 @@
+// Copyright (c) 2019 GitHub, Inc. All rights reserved.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#ifndef ATOM_COMMON_NATIVE_MATE_CONVERTERS_ONCE_CALLBACK_H_
+#define ATOM_COMMON_NATIVE_MATE_CONVERTERS_ONCE_CALLBACK_H_
+
+#include <utility>
+
+#include "atom/common/native_mate_converters/callback.h"
+
+namespace mate {
+
+namespace internal {
+
+// Manages the OnceCallback with ref-couting.
+template <typename Sig>
+class RefCountedOnceCallback
+    : public base::RefCounted<RefCountedOnceCallback<Sig>> {
+ public:
+  explicit RefCountedOnceCallback(base::OnceCallback<Sig> callback)
+      : callback_(std::move(callback)) {}
+
+  base::OnceCallback<Sig> GetCallback() { return std::move(callback_); }
+
+ private:
+  friend class base::RefCounted<RefCountedOnceCallback<Sig>>;
+  ~RefCountedOnceCallback() = default;
+
+  base::OnceCallback<Sig> callback_;
+};
+
+// Invokes the OnceCallback.
+template <typename Sig>
+struct InvokeOnceCallback {};
+
+template <typename... ArgTypes>
+struct InvokeOnceCallback<void(ArgTypes...)> {
+  static void Go(
+      scoped_refptr<RefCountedOnceCallback<void(ArgTypes...)>> holder,
+      ArgTypes... args) {
+    base::OnceCallback<void(ArgTypes...)> callback = holder->GetCallback();
+    DCHECK(!callback.is_null());
+    std::move(callback).Run(std::move(args)...);
+  }
+};
+
+template <typename ReturnType, typename... ArgTypes>
+struct InvokeOnceCallback<ReturnType(ArgTypes...)> {
+  static ReturnType Go(
+      scoped_refptr<RefCountedOnceCallback<ReturnType(ArgTypes...)>> holder,
+      ArgTypes... args) {
+    base::OnceCallback<void(ArgTypes...)> callback = holder->GetCallback();
+    DCHECK(!callback.is_null());
+    return std::move(callback).Run(std::move(args)...);
+  }
+};
+
+}  // namespace internal
+
+template <typename Sig>
+struct Converter<base::OnceCallback<Sig>> {
+  static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
+                                   base::OnceCallback<Sig> val) {
+    // Reuse the converter of base::RepeatingCallback by storing the callback
+    // with a RefCounted.
+    auto holder = base::MakeRefCounted<internal::RefCountedOnceCallback<Sig>>(
+        std::move(val));
+    return Converter<base::RepeatingCallback<Sig>>::ToV8(
+        isolate,
+        base::BindRepeating(&internal::InvokeOnceCallback<Sig>::Go, holder));
+  }
+
+  static bool FromV8(v8::Isolate* isolate,
+                     v8::Local<v8::Value> val,
+                     base::OnceCallback<Sig>* out) {
+    if (!val->IsFunction())
+      return false;
+    *out = base::BindOnce(&internal::V8FunctionInvoker<Sig>::Go, isolate,
+                          internal::SafeV8Function(isolate, val));
+    return true;
+  }
+};
+
+}  // namespace mate
+
+#endif  // ATOM_COMMON_NATIVE_MATE_CONVERTERS_ONCE_CALLBACK_H_