Support deeply nested uncommonAttributeSelectors.

third_party/WebKit/Source/core/css/RuleSet.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, 2012 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 32 matching lines @@
 #include "platform/weborigin/SecurityOrigin.h"
 
 #include "wtf/TerminatedArrayBuilder.h"
 
 namespace blink {
 
 using namespace HTMLNames;
 
 // -----------------------------------------------------------------
 
+static bool containsUncommonAttributeSelector(const CSSSelector&);
+
 static inline bool selectorListContainsUncommonAttributeSelector(const CSSSelector* selector)
 {
     const CSSSelectorList* selectorList = selector->selectorList();
     if (!selectorList)
         return false;
     for (const CSSSelector* selector = selectorList->first(); selector; selector = CSSSelectorList::next(*selector)) {
-        for (const CSSSelector* component = selector; component; component = component->tagHistory()) {
-            if (component->isAttributeSelector())
-                return true;
-        }
+        if (containsUncommonAttributeSelector(*selector))
+            return true;
     }
     return false;
 }
 
 static inline bool isCommonAttributeSelectorAttribute(const QualifiedName& attribute)
 {
     // These are explicitly tested for equality in canShareStyleWithElement.
     return attribute == typeAttr || attribute == readonlyAttr;
 }
 
-static inline bool containsUncommonAttributeSelector(const CSSSelector& selector)
+static bool containsUncommonAttributeSelector(const CSSSelector& selector)
 {
     const CSSSelector* current = &selector;
     for (; current; current = current->tagHistory()) {
         // Allow certain common attributes (used in the default style) in the selectors that match the current element.
         if (current->isAttributeSelector() && !isCommonAttributeSelectorAttribute(current->attribute()))
             return true;
         if (selectorListContainsUncommonAttributeSelector(current))
             return true;
         if (current->relation() != CSSSelector::SubSelector) {
             current = current->tagHistory();
@@ skipping 310 matching lines @@
 
 #ifndef NDEBUG
 void RuleSet::show()
 {
     for (const auto& rule: m_allRules)
         rule.selector().show();
 }
 #endif
 
 } // namespace blink