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

Source/core/css/analyzer/RuleSetAnalyzer.h

Index: Source/core/css/analyzer/RuleSetAnalyzer.h
diff --git a/Source/core/svg/SVGLengthListTearOff.h b/Source/core/css/analyzer/RuleSetAnalyzer.h
similarity index 60%
copy from Source/core/svg/SVGLengthListTearOff.h
copy to Source/core/css/analyzer/RuleSetAnalyzer.h
index b28dc8c94e6171147890fb606b6d1c0e53bed86f..76997849e0d457c15ec853e41227d19d7fa2d3ea 100644
--- a/Source/core/svg/SVGLengthListTearOff.h
+++ b/Source/core/css/analyzer/RuleSetAnalyzer.h
@@ -28,31 +28,39 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef SVGLengthListTearOff_h
-#define SVGLengthListTearOff_h
+#ifndef RuleSetAnalyzer_h
+#define RuleSetAnalyzer_h
 
-#include "core/svg/SVGLengthList.h"
-#include "core/svg/properties/NewSVGListPropertyTearOffHelper.h"
+#include "core/css/analyzer/DescendantInvalidationSet.h"
+#include "wtf/RefCounted.h"
 
 namespace WebCore {
 
-class SVGLengthListTearOff FINAL :
-    public NewSVGListPropertyTearOffHelper<SVGLengthListTearOff, SVGLengthList>,
-    public ScriptWrappable {
+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<SVGLengthListTearOff> create(PassRefPtr<SVGLengthList> target, SVGElement* contextElement, PropertyIsAnimValType propertyIsAnimVal, const QualifiedName& attributeName = nullQName())
-    {
-        return adoptRef(new SVGLengthListTearOff(target, contextElement, propertyIsAnimVal, attributeName));
-    }
+    static PassRefPtr<RuleSetAnalyzer> create();
+
+    void collectFeaturesFromRuleData(RuleFeatureSet& features, const RuleData&);
+    void combine(const RuleSetAnalyzer& other);
 
+    bool invalidateElementSubtreeForClassChange(const AtomicString& changedClass, Element* elementChanged) const;
 private:
-    SVGLengthListTearOff(PassRefPtr<SVGLengthList> target, SVGElement* contextElement, PropertyIsAnimValType propertyIsAnimVal, const QualifiedName& attributeName = nullQName())
-        : NewSVGListPropertyTearOffHelper<SVGLengthListTearOff, SVGLengthList>(target, contextElement, propertyIsAnimVal, attributeName)
-    {
-        ScriptWrappable::init(this);
-    }
+    RuleSetAnalyzer() { }

[esprehn, 2014/01/14 21:32:56]

Put this in the cpp file, doesn't need to be inline.

[chrishtr, 2014/01/14 23:33:00]

Done.

+    typedef HashMap<AtomicString, RefPtr<DescendantInvalidationSet> > InvalidationSetMap;
+
+    DescendantInvalidationSet* ensureClassInvalidationSet(const AtomicString& className);
+    DescendantInvalidationSet* getClassInvalidationSet(const AtomicString& className) const;
+
+    bool updateClassInvalidationSets(const CSSSelector*);
+
+    InvalidationSetMap classInvalidationSets;
 };
 
 } // namespace WebCore
 
-#endif // SVGLengthListTearOff_h_
+#endif // RuleSetAnalyzer_h