Initial skeleton of Accessibility Object Model Phase 1

third_party/WebKit/Source/core/dom/AccessibleNode.h

+// Copyright 2017 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 AccessibleNode_h
+#define AccessibleNode_h
+
+#include "bindings/core/v8/ScriptWrappable.h"
+#include "core/CoreExport.h"
+#include "wtf/HashMap.h"
+#include "wtf/text/AtomicString.h"
+#include "wtf/text/AtomicStringHash.h"
+
+namespace blink {
+
+class Element;
+
+enum class AOMStringProperty {

[esprehn, 2017/03/22 03:40:31]

What is an AOMStringProperty? Can you ad comments to all the classes?

[dmazzoni, 2017/03/23 03:36:40]

Done.

+  None,

[esprehn, 2017/03/22 03:40:32]

We've been prefixing with k for new ones.

[dmazzoni, 2017/03/23 03:36:40]

Done.

+  Role,
+  Label,
+};
+
+struct AOMStringPropertyHashTraits : WTF::GenericHashTraits<AOMStringProperty> {

[esprehn, 2017/03/22 03:40:32]

Can you explain why you need a custom hash config? These are pretty unusual and
often are not needed.

[dmazzoni, 2017/03/23 03:36:40]

No longer needed as I switched to an array, as suggested.

+  static const bool emptyValueIsZero = false;
+  static AOMStringProperty emptyValue() { return AOMStringProperty::None; };
+  static void constructDeletedValue(AOMStringProperty& slot, bool) {
+    slot = AOMStringProperty::None;
+  }
+  static bool isDeletedValue(AOMStringProperty value) {
+    return value == AOMStringProperty::None;
+  }
+};
+
+// Accessibility Object Model node
+// Explainer: https://github.com/WICG/aom/blob/master/explainer.md
+// Spec: https://wicg.github.io/aom/spec/
+class CORE_EXPORT AccessibleNode
+    : public GarbageCollectedFinalized<AccessibleNode>,
+      public ScriptWrappable {
+  DEFINE_WRAPPERTYPEINFO();
+
+ public:
+  AccessibleNode(Element*);
+  virtual ~AccessibleNode();
+
+  const AtomicString& getProperty(AOMStringProperty) const;
+
+  String role() const;
+  void setRole(const String&);
+
+  String label() const;
+  void setLabel(const String&);
+
+  DECLARE_VIRTUAL_TRACE();
+
+ private:
+  HashMap<AOMStringProperty,
+          AtomicString,
+          WTF::IntHash<AOMStringProperty>,
+          AOMStringPropertyHashTraits>
+      m_stringProperties;
+
+  // This object's owner Element.
+  WeakMember<Element> m_element;
+};
+
+}  // namespace blink
+
+#endif  // AccessibleNode_h