Add a first pass of a class descendant invalidator, and a containing RuleSetAnalyzer

Source/core/css/analyzer/RuleSetAnalyzer.h

 /*
  * Copyright (C) 2014 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.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 10 matching lines @@
  * 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.
  */
 
-#ifndef SVGAnimatedLength_h
-#define SVGAnimatedLength_h
+#ifndef RuleSetAnalyzer_h
+#define RuleSetAnalyzer_h
 
-#include "core/svg/SVGLengthTearOff.h"
-#include "core/svg/properties/NewSVGAnimatedProperty.h"
+#include "core/css/analyzer/DescendantInvalidationSet.h"
+#include "wtf/RefCounted.h"
 
 namespace WebCore {
 
-class SVGAnimatedLength : public NewSVGAnimatedProperty<SVGLength> {
+class CSSSelector;
+class RuleFeatureSet;
+class RuleData;
+
+// Keeps track of information about a set of CSS rules in order to answer style questions about them.
+class RuleSetAnalyzer : public RefCounted<RuleSetAnalyzer> {
 public:
-    static PassRefPtr<SVGAnimatedLength> create(SVGElement* contextElement, const QualifiedName& attributeName, PassRefPtr<SVGLength> initialValue)
-    {
-        return adoptRef(new SVGAnimatedLength(contextElement, attributeName, initialValue));
-    }
+    static PassRefPtr<RuleSetAnalyzer> create();
 
-    void setDefaultValueAsString(const String&);
-    void setBaseValueAsString(const String&, SVGLengthNegativeValuesMode, SVGParsingError&);
+    void collectFeaturesFromRuleData(RuleFeatureSet& features, const RuleData&);
+    void combine(const RuleSetAnalyzer& other);
+private:
+    RuleSetAnalyzer();
+    typedef HashMap<AtomicString, RefPtr<DescendantInvalidationSet> > InvalidationSetMap;
 
-protected:
-    SVGAnimatedLength(SVGElement* contextElement, const QualifiedName& attributeName, PassRefPtr<SVGLength> initialValue)
-        : NewSVGAnimatedProperty<SVGLength>(contextElement, attributeName, initialValue)
-    {
-    }
+    DescendantInvalidationSet* ensureClassInvalidationSet(const AtomicString& className);
+
+    bool updateClassInvalidationSets(const CSSSelector*);
+
+    InvalidationSetMap m_classInvalidationSets;
 };
 
 } // namespace WebCore
 
-#endif // SVGAnimatedLength_h
+#endif // RuleSetAnalyzer_h