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      1 /*
      2  * Copyright (C) 2008 Apple Inc. All rights reserved.
      3  * Copyright (C) 2009 Google Inc. All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  *
     14  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
     15  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     17  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
     18  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     19  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     20  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     21  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     22  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     24  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     25  */
     26 
     27 #include "config.h"
     28 #include "CSSSelectorList.h"
     29 
     30 namespace WebCore {
     31 
     32 CSSSelectorList::~CSSSelectorList()
     33 {
     34     deleteSelectors();
     35 }
     36 
     37 void CSSSelectorList::adopt(CSSSelectorList& list)
     38 {
     39     deleteSelectors();
     40     m_selectorArray = list.m_selectorArray;
     41     list.m_selectorArray = 0;
     42 }
     43 
     44 void CSSSelectorList::adoptSelectorVector(Vector<CSSSelector*>& selectorVector)
     45 {
     46     deleteSelectors();
     47     const size_t size = selectorVector.size();
     48     ASSERT(size);
     49     if (size == 1) {
     50         m_selectorArray = selectorVector[0];
     51         m_selectorArray->setLastInSelectorList();
     52         selectorVector.shrink(0);
     53         return;
     54     }
     55     m_selectorArray = reinterpret_cast<CSSSelector*>(fastMalloc(sizeof(CSSSelector) * selectorVector.size()));
     56     for (size_t i = 0; i < size; ++i) {
     57         memcpy(&m_selectorArray[i], selectorVector[i], sizeof(CSSSelector));
     58         // We want to free the memory (which was allocated with fastNew), but we
     59         // don't want the destructor to run since it will affect the copy we've just made.
     60         fastDeleteSkippingDestructor(selectorVector[i]);
     61         ASSERT(!m_selectorArray[i].isLastInSelectorList());
     62     }
     63     m_selectorArray[size - 1].setLastInSelectorList();
     64     selectorVector.shrink(0);
     65 }
     66 
     67 void CSSSelectorList::deleteSelectors()
     68 {
     69     if (!m_selectorArray)
     70         return;
     71 
     72     // We had two cases in adoptSelectVector. The fast case of a 1 element
     73     // vector took the CSSSelector directly, which was allocated with new.
     74     // The second case we allocated a new fastMalloc buffer, which should be
     75     // freed with fastFree, and the destructors called manually.
     76     CSSSelector* s = m_selectorArray;
     77     bool done = s->isLastInSelectorList();
     78     if (done)
     79         delete s;
     80     else {
     81         while (1) {
     82             s->~CSSSelector();
     83             if (done)
     84                 break;
     85             ++s;
     86             done = s->isLastInSelectorList();
     87         }
     88         fastFree(m_selectorArray);
     89     }
     90 }
     91 
     92 
     93 template <typename Functor>
     94 static bool forEachTagSelector(Functor& functor, CSSSelector* selector)
     95 {
     96     ASSERT(selector);
     97 
     98     do {
     99         if (functor(selector))
    100             return true;
    101         if (CSSSelector* simpleSelector = selector->simpleSelector()) {
    102             if (forEachTagSelector(functor, simpleSelector))
    103                 return true;
    104         }
    105     } while ((selector = selector->tagHistory()));
    106 
    107     return false;
    108 }
    109 
    110 template <typename Functor>
    111 static bool forEachSelector(Functor& functor, const CSSSelectorList* selectorList)
    112 {
    113     for (CSSSelector* selector = selectorList->first(); selector; selector = CSSSelectorList::next(selector)) {
    114         if (forEachTagSelector(functor, selector))
    115             return true;
    116     }
    117 
    118     return false;
    119 }
    120 
    121 class SelectorNeedsNamespaceResolutionFunctor {
    122 public:
    123     bool operator()(CSSSelector* selector)
    124     {
    125         if (selector->hasTag() && selector->m_tag.prefix() != nullAtom && selector->m_tag.prefix() != starAtom)
    126             return true;
    127         if (selector->hasAttribute() && selector->attribute().prefix() != nullAtom && selector->attribute().prefix() != starAtom)
    128             return true;
    129         return false;
    130     }
    131 };
    132 
    133 bool CSSSelectorList::selectorsNeedNamespaceResolution()
    134 {
    135     SelectorNeedsNamespaceResolutionFunctor functor;
    136     return forEachSelector(functor, this);
    137 }
    138 
    139 } // namespace WebCore
    140