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      1 /*
      2  * Copyright (C) 2010 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
      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. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     15  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     16  * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     17  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     18  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     19  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
     20  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     21  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     22  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     23  */
     24 
     25 #include "config.h"
     26 #include "core/html/ClassList.h"
     27 
     28 #include "core/dom/Document.h"
     29 
     30 namespace blink {
     31 
     32 using namespace HTMLNames;
     33 
     34 ClassList::ClassList(Element* element) : m_element(element) { }
     35 
     36 #if !ENABLE(OILPAN)
     37 void ClassList::ref()
     38 {
     39     m_element->ref();
     40 }
     41 
     42 void ClassList::deref()
     43 {
     44     m_element->deref();
     45 }
     46 #endif
     47 
     48 unsigned ClassList::length() const
     49 {
     50     return m_element->hasClass() ? classNames().size() : 0;
     51 }
     52 
     53 const AtomicString ClassList::item(unsigned index) const
     54 {
     55     if (index >= length())
     56         return AtomicString();
     57     return classNames()[index];
     58 }
     59 
     60 bool ClassList::containsInternal(const AtomicString& token) const
     61 {
     62     return m_element->hasClass() && classNames().contains(token);
     63 }
     64 
     65 const SpaceSplitString& ClassList::classNames() const
     66 {
     67     ASSERT(m_element->hasClass());
     68     if (m_element->document().inQuirksMode()) {
     69         if (!m_classNamesForQuirksMode)
     70             m_classNamesForQuirksMode = adoptPtr(new SpaceSplitString(value(), false));
     71         return *m_classNamesForQuirksMode.get();
     72     }
     73     return m_element->classNames();
     74 }
     75 
     76 void ClassList::trace(Visitor* visitor)
     77 {
     78     visitor->trace(m_element);
     79     DOMTokenList::trace(visitor);
     80 }
     81 
     82 } // namespace blink
     83