Add a helper for implementing Promise-valued properties.

Source/bindings/v8/ScriptPromisePropertyBase.h

+// Copyright 2014 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 ScriptPromisePropertyBase_h
+#define ScriptPromisePropertyBase_h
+
+#include "bindings/v8/ScopedPersistent.h"
+#include "bindings/v8/ScriptPromise.h"
+#include "core/dom/ActiveDOMObject.h"
+#include "wtf/OwnPtr.h"
+#include "wtf/RefCounted.h"
+#include "wtf/Vector.h"
+#include <v8.h>
+
+namespace WebCore {
+
+class ExecutionContext;
+
+class ScriptPromisePropertyBase : public ActiveDOMObject, public RefCountedWillBeGarbageCollected<ScriptPromisePropertyBase> {
+public:
+    virtual ~ScriptPromisePropertyBase();
+
+    enum State {
+        Pending,
+        Resolved,
+        Rejected,
+    };
+    State state() { return m_state; }

[yhirano, 2014/07/01 04:38:14]

const

+
+    ScriptPromise promise(DOMWrapperWorld&);
+
+protected:
+    ScriptPromisePropertyBase(ExecutionContext*, const char* name);
+
+    void settle(State targetState);
+
+    virtual v8::Handle<v8::Object> holder(v8::Handle<v8::Object> creationContext, v8::Isolate*) = 0;
+    virtual v8::Handle<v8::Value> resolvedValue(v8::Handle<v8::Object> creationContext, v8::Isolate*) = 0;
+    virtual v8::Handle<v8::Value> rejectedValue(v8::Handle<v8::Object> creationContext, v8::Isolate*) = 0;
+
+private:
+    void resolveOrReject(v8::Handle<v8::Promise::Resolver>);
+    void enqueuePendingAction(v8::Handle<v8::Promise::Resolver>, v8::Handle<v8::Value>, State);
+
+    // ActiveDOMObject overrides
+    virtual void resume() OVERRIDE;
+    virtual void stop() OVERRIDE;
+
+    v8::Isolate* m_isolate;
+    State m_state;
+    bool m_inResume;
+    ScopedPersistent<v8::String> m_resolverName;
+    ScopedPersistent<v8::String> m_promiseName;
+
+    class PendingAction;
+    typedef Vector<OwnPtr<PendingAction> > PendingActionList;
+    PendingActionList m_pending;
+
+    // FIXME: When isolated worlds are supported replace this with a
+    // set of wrappers.
+    ScopedPersistent<v8::Object> m_mainWorldWrapper;
+};
+
+} // namespace WebCore
+
+#endif // ScriptPromisePropertyBase_h