third_party/WebKit/Source/core/html/ClassList.cpp

/*
 * Copyright (C) 2010 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1.  Redistributions of source code must retain the above copyright
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 * 2.  Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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#include "core/html/ClassList.h"

#include "core/dom/Document.h"
#include "wtf/PtrUtil.h"

namespace blink {

using namespace HTMLNames;

ClassList::ClassList(Element* element)
    : DOMTokenList(nullptr), m_element(element) {}

unsigned ClassList::length() const {
  return m_element->hasClass() ? classNames().size() : 0;
}

const AtomicString ClassList::item(unsigned index) const {
  if (index >= length())
    return AtomicString();
  return classNames()[index];
}

bool ClassList::containsInternal(const AtomicString& token) const {
  return m_element->hasClass() && classNames().contains(token);
}

const SpaceSplitString& ClassList::classNames() const {
  DCHECK(m_element->hasClass());
  if (m_element->document().inQuirksMode()) {
    if (!m_classNamesForQuirksMode)
      m_classNamesForQuirksMode = wrapUnique(
          new SpaceSplitString(value(), SpaceSplitString::ShouldNotFoldCase));
    return *m_classNamesForQuirksMode.get();
  }
  return m_element->classNames();
}

DEFINE_TRACE(ClassList) {
  visitor->trace(m_element);
  DOMTokenList::trace(visitor);
}

}  // namespace blink