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      1 /*
      2  * Copyright (C) 2011 Google 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 are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef HTMLContentElement_h
     32 #define HTMLContentElement_h
     33 
     34 #include "core/css/CSSSelectorList.h"
     35 #include "core/dom/shadow/InsertionPoint.h"
     36 
     37 namespace WebCore {
     38 
     39 class HTMLContentElement FINAL : public InsertionPoint {
     40 public:
     41     static PassRefPtr<HTMLContentElement> create(const QualifiedName&, Document*);
     42     static PassRefPtr<HTMLContentElement> create(Document*);
     43 
     44     virtual ~HTMLContentElement();
     45 
     46     virtual bool canAffectSelector() const OVERRIDE { return true; }
     47 
     48     bool canSelectNode(const Vector<Node*>& siblings, int nth) const;
     49 
     50     const CSSSelectorList& selectorList() const;
     51     bool isSelectValid() const;
     52 
     53 private:
     54     HTMLContentElement(const QualifiedName&, Document*);
     55 
     56     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
     57 
     58     bool validateSelect() const;
     59     void parseSelect();
     60 
     61     bool matchSelector(const Vector<Node*>& siblings, int nth) const;
     62 
     63     bool m_shouldParseSelect;
     64     bool m_isValidSelector;
     65     AtomicString m_select;
     66     CSSSelectorList m_selectorList;
     67 };
     68 
     69 inline const CSSSelectorList& HTMLContentElement::selectorList() const
     70 {
     71     if (m_shouldParseSelect)
     72         const_cast<HTMLContentElement*>(this)->parseSelect();
     73     return m_selectorList;
     74 }
     75 
     76 inline bool HTMLContentElement::isSelectValid() const
     77 {
     78     if (m_shouldParseSelect)
     79         const_cast<HTMLContentElement*>(this)->parseSelect();
     80     return m_isValidSelector;
     81 }
     82 
     83 inline bool HTMLContentElement::canSelectNode(const Vector<Node*>& siblings, int nth) const
     84 {
     85     if (m_select.isNull() || m_select.isEmpty())
     86         return true;
     87     if (!isSelectValid())
     88         return false;
     89     if (!siblings[nth]->isElementNode())
     90         return false;
     91     return matchSelector(siblings, nth);
     92 }
     93 
     94 inline bool isHTMLContentElement(const Node* node)
     95 {
     96     return node->hasTagName(HTMLNames::contentTag);
     97 }
     98 
     99 inline bool isHTMLContentElement(const Element* element)
    100 {
    101     return element->hasTagName(HTMLNames::contentTag);
    102 }
    103 
    104 inline HTMLContentElement* toHTMLContentElement(Node* node)
    105 {
    106     ASSERT_WITH_SECURITY_IMPLICATION(!node || isHTMLContentElement(node));
    107     return static_cast<HTMLContentElement*>(node);
    108 }
    109 
    110 }
    111 
    112 #endif
    113