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      1 /*
      2  * Copyright (C) 2008 Apple Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #ifndef CSSSelectorList_h
     27 #define CSSSelectorList_h
     28 
     29 #include "core/css/CSSSelector.h"
     30 
     31 namespace WebCore {
     32 
     33 class CSSParserSelector;
     34 
     35 class CSSSelectorList {
     36     WTF_MAKE_FAST_ALLOCATED;
     37 public:
     38     CSSSelectorList() : m_selectorArray(0) { }
     39     CSSSelectorList(const CSSSelectorList&);
     40 
     41     ~CSSSelectorList();
     42 
     43     void adopt(CSSSelectorList& list);
     44     void adoptSelectorVector(Vector<OwnPtr<CSSParserSelector> >& selectorVector);
     45 
     46     bool isValid() const { return !!m_selectorArray; }
     47     const CSSSelector* first() const { return m_selectorArray; }
     48     static const CSSSelector* next(const CSSSelector&);
     49     bool hasOneSelector() const { return m_selectorArray && !next(*m_selectorArray); }
     50     const CSSSelector& selectorAt(size_t index) const { return m_selectorArray[index]; }
     51 
     52     size_t indexOfNextSelectorAfter(size_t index) const
     53     {
     54         const CSSSelector& current = selectorAt(index);
     55         const CSSSelector* next = this->next(current);
     56         if (!next)
     57             return kNotFound;
     58         return next - m_selectorArray;
     59     }
     60 
     61     bool selectorsNeedNamespaceResolution();
     62 
     63     bool hasShadowDistributedAt(size_t index) const;
     64     bool selectorCrossesTreeScopes(size_t index) const;
     65 
     66     String selectorsText() const;
     67 
     68 private:
     69     unsigned length() const;
     70     void deleteSelectors();
     71 
     72     // Hide.
     73     CSSSelectorList& operator=(const CSSSelectorList&);
     74 
     75     // End of a multipart selector is indicated by m_isLastInTagHistory bit in the last item.
     76     // End of the array is indicated by m_isLastInSelectorList bit in the last item.
     77     CSSSelector* m_selectorArray;
     78 };
     79 
     80 inline const CSSSelector* CSSSelectorList::next(const CSSSelector& current)
     81 {
     82     // Skip subparts of compound selectors.
     83     const CSSSelector* last = &current;
     84     while (!last->isLastInTagHistory())
     85         last++;
     86     return last->isLastInSelectorList() ? 0 : last + 1;
     87 }
     88 
     89 } // namespace WebCore
     90 
     91 #endif // CSSSelectorList_h
     92