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 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 {
+class CSSSelector;
+class Document;
+class RuleFeatureSet;
+class RuleData;
+class ShadowRoot;
+
+// Keeps track of information about a set of CSS rules in order to answer style questions about them.
+class RuleSetAnalyzer : public RefCounted<RuleSetAnalyzer> {
 public:
-    GraphicsLayerDebugInfo();
-    virtual ~GraphicsLayerDebugInfo();
+    static PassRefPtr<RuleSetAnalyzer> create();
 
-    virtual void appendAsTraceFormat(blink::WebString* out) const OVERRIDE;
+    void collectFeaturesFromRuleData(RuleFeatureSet& features, const RuleData&);
+    void combine(const RuleSetAnalyzer& other);
 
-    GraphicsLayerDebugInfo* clone() const;
+    bool scheduleClassInvalidationForElement(const AtomicString& className, Element*);
+    void recalcInvalidation(Document*);
 
-    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 needsInvalidation(const Element*) const;
+private:
+    RuleSetAnalyzer();
+    typedef HashMap<AtomicString, RefPtr<DescendantInvalidationSet> > InvalidationSetMap;
+    typedef Vector<DescendantInvalidationSet*> InvalidationVec;
+    typedef HashMap<Element*, InvalidationVec* > PendingInvalidationMap;
 
-private:
-    void appendLayoutRects(JSONObject*) const;
-    void appendCompositingReasons(JSONObject*) const;
-    void appendDebugName(JSONObject*) const;
+    DescendantInvalidationSet* ensureClassInvalidationSet(const AtomicString& className);
 
-    String m_debugName;
-    CompositingReasons m_compositingReasons;
-    Vector<LayoutRect> m_currentLayoutRects;
+    bool updateClassInvalidationSets(const CSSSelector*);
+
+    bool recalcInvalidationInternal(Element*, Vector<AtomicString>&, bool foundInvalidationSet);
+    bool recalcInvalidationInternalForShadowRoot(ShadowRoot*, Vector<AtomicString>& invalidationClasses, bool foundInvalidationSet);
+
+    InvalidationVec* ensurePendingInvalidationVector(Element*);
+
+    InvalidationSetMap classInvalidationSets;
+
+    
+    PendingInvalidationMap m_pendingInvalidationMap;
 };
 
 } // namespace WebCore
 
-#endif
+#endif // RuleSetAnalyzer_h