Implement a simple version of SelectorQuery.

third_party/WebKit/Source/core/css/SelectorChecker.h

 /*
  * 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, 2013 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 81 matching lines @@
     struct MatchResult {
         STACK_ALLOCATED();
         MatchResult()
             : dynamicPseudo(NOPSEUDO)
             , specificity(0) { }
 
         PseudoId dynamicPseudo;
         unsigned specificity;
     };
 
-    bool match(const SelectorCheckingContext&, MatchResult&) const;
-    bool match(const SelectorCheckingContext&) const;
+    bool match(const SelectorCheckingContext& context, MatchResult& result) const
+    {
+        ASSERT(context.selector);
+        return matchSelector(context, result) == SelectorMatches;
+    }
+
+    bool match(const SelectorCheckingContext& context) const
+    {
+        MatchResult ignoreResult;
+        return match(context, ignoreResult);
+    }
 
     static bool matchesFocusPseudoClass(const Element&);
 
 private:
     bool checkOne(const SelectorCheckingContext&, MatchResult&) const;
 
     enum Match { SelectorMatches, SelectorFailsLocally, SelectorFailsAllSiblings, SelectorFailsCompletely };
 
     Match matchSelector(const SelectorCheckingContext&, MatchResult&) const;
     Match matchForSubSelector(const SelectorCheckingContext&, MatchResult&) const;
     Match matchForRelation(const SelectorCheckingContext&, MatchResult&) const;
     Match matchForShadowDistributed(const SelectorCheckingContext&, const Element&, MatchResult&) const;
     Match matchForPseudoShadow(const SelectorCheckingContext&, const ContainerNode*, MatchResult&) const;
     bool checkPseudoClass(const SelectorCheckingContext&, MatchResult&) const;
     bool checkPseudoElement(const SelectorCheckingContext&, MatchResult&) const;
     bool checkScrollbarPseudoClass(const SelectorCheckingContext&, MatchResult&) const;
     bool checkPseudoHost(const SelectorCheckingContext&, MatchResult&) const;
     bool checkPseudoNot(const SelectorCheckingContext&, MatchResult&) const;
 
     Mode m_mode;
 };
 
 }
 
 #endif