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

Source/core/css/analyzer/DescendantInvalidationSet.cpp

 /*
  * 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 11 matching lines @@
  * 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.
  */
 
 #include "config.h"
+#include "core/css/analyzer/DescendantInvalidationSet.h"
 
-#include "core/svg/SVGAnimatedLength.h"
+#include "core/css/resolver/StyleResolver.h"
+#include "core/dom/Element.h"
 
 namespace WebCore {
 
-void SVGAnimatedLength::setDefaultValueAsString(const String& value)
+DescendantInvalidationSet::DescendantInvalidationSet()
+    : m_allDescendantsMightBeInvalid(false)
 {
-    baseValue()->setValueAsString(value, ASSERT_NO_EXCEPTION);
 }
 
-void SVGAnimatedLength::setBaseValueAsString(const String& value, SVGLengthNegativeValuesMode mode, SVGParsingError& parseError)
+void DescendantInvalidationSet::combine(const DescendantInvalidationSet& other)
 {
-    TrackExceptionState es;
+    m_allDescendantsMightBeInvalid = m_allDescendantsMightBeInvalid || other.m_allDescendantsMightBeInvalid;
+    // No longer bother combining data structures, since the whole subtree is deemed invalid.
+    if (m_allDescendantsMightBeInvalid)
+        return;
 
-    baseValue()->setValueAsString(value, es);
+    HashSet<AtomicString>::const_iterator end = other.m_classes.end();
+    for (HashSet<AtomicString>::const_iterator it = other.m_classes.begin(); it != end; ++it)
+        addClass(*it);
 
-    if (es.hadException()) {
-        parseError = ParsingAttributeFailedError;
-        baseValue()->newValueSpecifiedUnits(LengthTypeNumber, 0);
-    } else if (mode == ForbidNegativeLengths && baseValue()->valueInSpecifiedUnits() < 0) {
-        parseError = NegativeValueForbiddenError;
-    }
+    end = other.m_ids.end();
+    for (HashSet<AtomicString>::const_iterator it = other.m_ids.begin(); it != end; ++it)
+        addId(*it);
+
+    end = other.m_tagNames.end();
+    for (HashSet<AtomicString>::const_iterator it = other.m_tagNames.begin(); it != end; ++it)
+        addTagName(*it);
 }
 
+void DescendantInvalidationSet::addClass(const AtomicString& className)
+{
+    m_classes.add(className);
 }
+
+void DescendantInvalidationSet::addId(const AtomicString& id)
+{
+    m_ids.add(id);
+}
+
+void DescendantInvalidationSet::addTagName(const AtomicString& tagName)
+{
+    m_tagNames.add(tagName);
+}
+
+} // namespace WebCore