Implement matching part of ::slotted() pseudo element

third_party/WebKit/Source/core/css/SelectorFilter.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
@@ skipping 116 matching lines @@
     default:
         break;
     }
 }
 
 void SelectorFilter::collectIdentifierHashes(const CSSSelector& selector, unsigned* identifierHashes, unsigned maximumIdentifierCount)
 {
     unsigned* hash = identifierHashes;
     unsigned* end = identifierHashes + maximumIdentifierCount;
     CSSSelector::Relation relation = selector.relation();
-    bool relationIsAffectedByPseudoContent = selector.relationIsAffectedByPseudoContent();
+    if (selector.relationIsAffectedByPseudoContent()) {
+        // Disable fastRejectSelector.
+        *identifierHashes = 0;
+        return;
+    }
 
     // Skip the topmost selector. It is handled quickly by the rule hashes.
     bool skipOverSubselectors = true;
     for (const CSSSelector* current = selector.tagHistory(); current; current = current->tagHistory()) {
         // Only collect identifiers that match ancestors.
         switch (relation) {
         case CSSSelector::SubSelector:
             if (!skipOverSubselectors)
                 collectDescendantSelectorIdentifierHashes(*current, hash);
             break;
         case CSSSelector::DirectAdjacent:
         case CSSSelector::IndirectAdjacent:
             skipOverSubselectors = true;
             break;
+        case CSSSelector::ShadowSlot:
+            // Disable fastRejectSelector.
+            *identifierHashes = 0;
+            return;
         case CSSSelector::Descendant:
         case CSSSelector::Child:
-            if (relationIsAffectedByPseudoContent) {
-                // Disable fastRejectSelector.
-                *identifierHashes = 0;
-                return;
-            }
             // Fall through.
         case CSSSelector::ShadowPseudo:
         case CSSSelector::ShadowDeep:
             skipOverSubselectors = false;
             collectDescendantSelectorIdentifierHashes(*current, hash);
             break;
-        case CSSSelector::ShadowSlot:
-            // TODO(kochi): Add this in later CL.
-            break;
         }
         if (hash == end)
             return;
         relation = current->relation();
-        relationIsAffectedByPseudoContent = current->relationIsAffectedByPseudoContent();
+        if (current->relationIsAffectedByPseudoContent()) {
+            // Disable fastRejectSelector.
+            *identifierHashes = 0;
+            return;
+        }
     }
     *hash = 0;
 }
 
 DEFINE_TRACE(SelectorFilter::ParentStackFrame)
 {
     visitor->trace(element);
 }
 
 DEFINE_TRACE(SelectorFilter)
 {
 #if ENABLE(OILPAN)
     visitor->trace(m_parentStack);
 #endif
 }
 
 }