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/platform/graphics/GraphicsLayerDebugInfo.h b/Source/core/css/analyzer/RuleSetAnalyzer.h
similarity index 50%
copy from Source/platform/graphics/GraphicsLayerDebugInfo.h
copy to Source/core/css/analyzer/RuleSetAnalyzer.h
index 8ef0716d66b786edb67ef8aa7c7f53779b9996dc..a461a7199773ac5792c9933926cbd3b0217ed8b7 100644
--- a/Source/platform/graphics/GraphicsLayerDebugInfo.h
+++ b/Source/core/css/analyzer/RuleSetAnalyzer.h
@@ -28,42 +28,53 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef GraphicsLayerDebugInfo_h
-#define GraphicsLayerDebugInfo_h
+#ifndef RuleSetAnalyzer_h
+#define RuleSetAnalyzer_h
 
-#include "platform/JSONValues.h"
-#include "platform/geometry/LayoutRect.h"
-#include "platform/graphics/CompositingReasons.h"
-#include "public/platform/WebGraphicsLayerDebugInfo.h"
-
-#include "wtf/Vector.h"
+#include "core/css/analyzer/DescendantInvalidationSet.h"
+#include "wtf/RefCounted.h"
 
 namespace WebCore {
 
-class GraphicsLayerDebugInfo FINAL : public blink::WebGraphicsLayerDebugInfo {
-public:
-    GraphicsLayerDebugInfo();
-    virtual ~GraphicsLayerDebugInfo();
+class CSSSelector;
+class Document;
+class RuleFeatureSet;
+class RuleData;
+class ShadowRoot;
 
-    virtual void appendAsTraceFormat(blink::WebString* out) const OVERRIDE;
+// 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<RuleSetAnalyzer> create();
 
-    GraphicsLayerDebugInfo* clone() const;
+    void collectFeaturesFromRuleData(RuleFeatureSet& features, const RuleData&);
+    void combine(const RuleSetAnalyzer& other);
 
-    void setDebugName(const String& name) { m_debugName = name; }
-    CompositingReasons compositingReasons() const { return m_compositingReasons; }
-    void setCompositingReasons(CompositingReasons reasons) { m_compositingReasons = reasons; }
-    Vector<LayoutRect>& currentLayoutRects() { return m_currentLayoutRects; }
+    bool scheduleClassInvalidationForElement(const AtomicString& className, Element*);
+    void recalcInvalidation(Document*);
 
+    bool needsInvalidation(const Element*) const;
 private:
-    void appendLayoutRects(JSONObject*) const;
-    void appendCompositingReasons(JSONObject*) const;
-    void appendDebugName(JSONObject*) const;
+    RuleSetAnalyzer();
+    typedef HashMap<AtomicString, RefPtr<DescendantInvalidationSet> > InvalidationSetMap;
+    typedef Vector<DescendantInvalidationSet*> InvalidationVec;
+    typedef HashMap<Element*, InvalidationVec* > PendingInvalidationMap;
+
+    DescendantInvalidationSet* ensureClassInvalidationSet(const AtomicString& className);
+
+    bool updateClassInvalidationSets(const CSSSelector*);
+
+    bool recalcInvalidationInternal(Element*, Vector<AtomicString>&, bool foundInvalidationSet);
+    bool recalcInvalidationInternalForShadowRoot(ShadowRoot*, Vector<AtomicString>& invalidationClasses, bool foundInvalidationSet);
+
+    InvalidationVec* ensurePendingInvalidationVector(Element*);
+
+    InvalidationSetMap classInvalidationSets;
 
-    String m_debugName;
-    CompositingReasons m_compositingReasons;
-    Vector<LayoutRect> m_currentLayoutRects;
+    
+    PendingInvalidationMap m_pendingInvalidationMap;
 };
 
 } // namespace WebCore
 
-#endif
+#endif // RuleSetAnalyzer_h