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      1 /*
      2  * Copyright (C) 1999 Lars Knoll (knoll (at) kde.org)
      3  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
      4  *
      5  * This library is free software; you can redistribute it and/or
      6  * modify it under the terms of the GNU Library General Public
      7  * License as published by the Free Software Foundation; either
      8  * version 2 of the License, or (at your option) any later version.
      9  *
     10  * This library is distributed in the hope that it will be useful,
     11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     13  * Library General Public License for more details.
     14  *
     15  * You should have received a copy of the GNU Library General Public License
     16  * along with this library; see the file COPYING.LIB.  If not, write to
     17  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     18  * Boston, MA 02110-1301, USA.
     19  *
     20  */
     21 
     22 #ifndef RuleFeature_h
     23 #define RuleFeature_h
     24 
     25 #include "wtf/Forward.h"
     26 #include "wtf/HashSet.h"
     27 #include "wtf/text/AtomicStringHash.h"
     28 
     29 namespace WebCore {
     30 
     31 class StyleRule;
     32 class CSSSelector;
     33 class CSSSelectorList;
     34 
     35 struct RuleFeature {
     36     RuleFeature(StyleRule* rule, unsigned selectorIndex, bool hasDocumentSecurityOrigin)
     37         : rule(rule)
     38         , selectorIndex(selectorIndex)
     39         , hasDocumentSecurityOrigin(hasDocumentSecurityOrigin)
     40     {
     41     }
     42     StyleRule* rule;
     43     unsigned selectorIndex;
     44     bool hasDocumentSecurityOrigin;
     45 };
     46 
     47 class RuleFeatureSet {
     48 public:
     49     RuleFeatureSet()
     50         : m_usesFirstLineRules(false)
     51         , m_maxDirectAdjacentSelectors(0)
     52     { }
     53 
     54     void add(const RuleFeatureSet&);
     55     void clear();
     56 
     57     void collectFeaturesFromSelector(const CSSSelector*);
     58 
     59     bool usesSiblingRules() const { return !siblingRules.isEmpty(); }
     60     bool usesFirstLineRules() const { return m_usesFirstLineRules; }
     61 
     62     unsigned maxDirectAdjacentSelectors() const { return m_maxDirectAdjacentSelectors; }
     63     void setMaxDirectAdjacentSelectors(unsigned value)  { m_maxDirectAdjacentSelectors = std::max(value, m_maxDirectAdjacentSelectors); }
     64 
     65     inline bool hasSelectorForAttribute(const AtomicString& attributeName) const
     66     {
     67         ASSERT(!attributeName.isEmpty());
     68         return attrsInRules.contains(attributeName);
     69     }
     70 
     71     inline bool hasSelectorForClass(const AtomicString& classValue) const
     72     {
     73         ASSERT(!classValue.isEmpty());
     74         return classesInRules.contains(classValue);
     75     }
     76 
     77     inline bool hasSelectorForId(const AtomicString& idValue) const
     78     {
     79         ASSERT(!idValue.isEmpty());
     80         return idsInRules.contains(idValue);
     81     }
     82 
     83     HashSet<AtomicString> idsInRules;
     84     HashSet<AtomicString> classesInRules;
     85     HashSet<AtomicString> attrsInRules;
     86     Vector<RuleFeature> siblingRules;
     87     Vector<RuleFeature> uncommonAttributeRules;
     88 private:
     89     void collectFeaturesFromSelectorList(const CSSSelectorList*);
     90 
     91     bool m_usesFirstLineRules;
     92     unsigned m_maxDirectAdjacentSelectors;
     93 };
     94 
     95 } // namespace WebCore
     96 
     97 #endif // RuleFeature_h
     98