Refactor ElementShadow by separating v0 related features as ElementShadowV0

third_party/WebKit/Source/core/dom/shadow/ElementShadow.h

-/*

[tkent, 2016/09/13 07:09:45]

To me this file doesn't look a new file.  Probably we should not change the
copyright header.

[hayato, 2016/09/13 07:14:56]

Sure. Done.

- * Copyright (C) 2012 Google Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *     * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
+// Copyright 2016 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 ElementShadow_h
 #define ElementShadow_h
 
 #include "core/CoreExport.h"
-#include "core/dom/shadow/InsertionPoint.h"
-#include "core/dom/shadow/SelectRuleFeatureSet.h"
 #include "core/dom/shadow/ShadowRoot.h"
 #include "platform/heap/Handle.h"
-#include "wtf/HashMap.h"
 #include "wtf/Noncopyable.h"
 
 namespace blink {
 
+class ElementShadowV0;
+
 class CORE_EXPORT ElementShadow final : public GarbageCollectedFinalized<ElementShadow> {
     WTF_MAKE_NONCOPYABLE(ElementShadow);
 public:
     static ElementShadow* create();
     ~ElementShadow();
 
-    Element& host() const;
+    Element& host() const { DCHECK(m_shadowRoot); return m_shadowRoot->host(); }
+
+    // TODO(hayato): Remove youngestShadowRoot() and oldestShadowRoot() from ElementShadow
     ShadowRoot& youngestShadowRoot() const;
     ShadowRoot& oldestShadowRoot() const { DCHECK(m_shadowRoot); return *m_shadowRoot; }
+
     ElementShadow* containingShadow() const;
 
     ShadowRoot& addShadowRoot(Element& shadowHost, ShadowRootType);
 
-    bool hasSameStyles(const ElementShadow*) const;
+    bool hasSameStyles(const ElementShadow&) const;
 
     void attach(const Node::AttachContext&);
     void detach(const Node::AttachContext&);
 
     void distributeIfNeeded();
+
     void setNeedsDistributionRecalc();
     bool needsDistributionRecalc() const { return m_needsDistributionRecalc; }
 
-    bool isV1() const { return youngestShadowRoot().isV1(); };
-    bool isOpenOrV0() const { return youngestShadowRoot().isOpenOrV0(); };
+    bool isV1() const { return youngestShadowRoot().isV1(); }
+    bool isOpenOrV0() const { return youngestShadowRoot().isOpenOrV0(); }
 
-    // For only v0
-    void willAffectSelector();
-    const SelectRuleFeatureSet& ensureSelectFeatureSet();
-
-    const InsertionPoint* finalDestinationInsertionPointFor(const Node*) const;
-    const DestinationInsertionPoints* destinationInsertionPointsFor(const Node*) const;
-
-    void didDistributeNode(const Node*, InsertionPoint*);
+    ElementShadowV0& v0() const { DCHECK(m_elementShadowV0); return *m_elementShadowV0; }
 
     DECLARE_TRACE();
     DECLARE_TRACE_WRAPPERS();
 
 private:
     ElementShadow();
 
     void appendShadowRoot(ShadowRoot&);
+    void distribute();
 
-    void distribute();
-    void clearDistributionV0();
-
-    void distributeV0();
-    void distributeV1();
-
-    void collectSelectFeatureSetFrom(ShadowRoot&);
-    void distributeNodeChildrenTo(InsertionPoint*, ContainerNode*);
-
-    bool needsSelectFeatureSet() const { return m_needsSelectFeatureSet; }
-    void setNeedsSelectFeatureSet() { m_needsSelectFeatureSet = true; }
-
+    Member<ElementShadowV0> m_elementShadowV0;
     Member<ShadowRoot> m_shadowRoot;
     bool m_needsDistributionRecalc;
-
-    // For only v0
-    using NodeToDestinationInsertionPoints = HeapHashMap<Member<const Node>, Member<DestinationInsertionPoints>>;
-    NodeToDestinationInsertionPoints m_nodeToInsertionPoints;
-    SelectRuleFeatureSet m_selectFeatures;
-    bool m_needsSelectFeatureSet;
 };
 
-inline Element& ElementShadow::host() const
-{
-    DCHECK(m_shadowRoot);
-    return m_shadowRoot->host();
-}
-
 inline ShadowRoot* Node::youngestShadowRoot() const
 {
     if (!isElementNode())
-        return 0;
+        return nullptr;
     return toElement(this)->youngestShadowRoot();
 }
 
 inline ShadowRoot* Element::youngestShadowRoot() const
 {
     if (ElementShadow* shadow = this->shadow())
         return &shadow->youngestShadowRoot();
-    return 0;
+    return nullptr;
 }
 
 inline ElementShadow* ElementShadow::containingShadow() const
 {
     if (ShadowRoot* parentRoot = host().containingShadowRoot())
         return parentRoot->owner();
-    return 0;
+    return nullptr;
 }
 
 inline void ElementShadow::distributeIfNeeded()
 {
     if (m_needsDistributionRecalc)
         distribute();
     m_needsDistributionRecalc = false;
 }
 
 } // namespace blink
 
 #endif