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

/*
 * 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
 *     notice, this list of conditions and the following disclaimer.
 * 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
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 */

#ifndef ClassList_h
#define ClassList_h

#include "core/HTMLNames.h"
#include "core/dom/DOMTokenList.h"
#include "core/dom/Element.h"
#include "core/dom/SpaceSplitString.h"
#include <memory>

namespace blink {

class Element;

class ClassList final : public DOMTokenList {
 public:
  static ClassList* Create(Element* element) { return new ClassList(element); }

  unsigned length() const override;
  const AtomicString item(unsigned index) const override;

  void ClearValueForQuirksMode() { class_names_for_quirks_mode_ = nullptr; }

  DECLARE_VIRTUAL_TRACE();

 private:
  explicit ClassList(Element*);

  bool ContainsInternal(const AtomicString&) const override;

  const SpaceSplitString& ClassNames() const;
  SpaceSplitString& MutableSet() override;

  const AtomicString& value() const override {
    return element_->getAttribute(HTMLNames::classAttr);
  }
  void setValue(const AtomicString& value) override {
    element_->setAttribute(HTMLNames::classAttr, value);
    mutable_set_.Clear();
  }

  Member<Element> element_;
  mutable std::unique_ptr<SpaceSplitString> class_names_for_quirks_mode_;
  SpaceSplitString mutable_set_;
};

}  // namespace blink

#endif  // ClassList_h