third_party/WebKit/Source/core/css/CSSSelectorList.h

/*
 * Copyright (C) 2008 Apple 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. ``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
 * 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 CSSSelectorList_h
#define CSSSelectorList_h

#include "core/CoreExport.h"
#include "core/css/CSSSelector.h"
#include <memory>

namespace blink {

class CSSParserSelector;

class CORE_EXPORT CSSSelectorList {
  USING_FAST_MALLOC(CSSSelectorList);

 public:
  CSSSelectorList() : m_selectorArray(nullptr) {}

  CSSSelectorList(CSSSelectorList&& o) : m_selectorArray(o.m_selectorArray) {
    o.m_selectorArray = nullptr;
  }

  CSSSelectorList& operator=(CSSSelectorList&& o) {
    deleteSelectorsIfNeeded();
    m_selectorArray = o.m_selectorArray;
    o.m_selectorArray = nullptr;
    return *this;
  }

  ~CSSSelectorList() { deleteSelectorsIfNeeded(); }

  static CSSSelectorList adoptSelectorVector(
      Vector<std::unique_ptr<CSSParserSelector>>& selectorVector);
  CSSSelectorList copy() const;

  bool isValid() const { return !!m_selectorArray; }
  const CSSSelector* first() const { return m_selectorArray; }
  static const CSSSelector* next(const CSSSelector&);
  bool hasOneSelector() const {
    return m_selectorArray && !next(*m_selectorArray);
  }
  const CSSSelector& selectorAt(size_t index) const {
    return m_selectorArray[index];
  }

  size_t selectorIndex(const CSSSelector& selector) const {
    return &selector - m_selectorArray;
  }

  size_t indexOfNextSelectorAfter(size_t index) const {
    const CSSSelector& current = selectorAt(index);
    const CSSSelector* next = this->next(current);
    if (!next)
      return kNotFound;
    return selectorIndex(*next);
  }

  String selectorsText() const;

 private:
  unsigned length() const;

  void deleteSelectorsIfNeeded() {
    if (m_selectorArray)
      deleteSelectors();
  }
  void deleteSelectors();

  CSSSelectorList(const CSSSelectorList&) = delete;
  CSSSelectorList& operator=(const CSSSelectorList&) = delete;

  // End of a multipart selector is indicated by m_isLastInTagHistory bit in the
  // last item. End of the array is indicated by m_isLastInSelectorList bit in
  // the last item.
  CSSSelector* m_selectorArray;
};

inline const CSSSelector* CSSSelectorList::next(const CSSSelector& current) {
  // Skip subparts of compound selectors.
  const CSSSelector* last = &current;
  while (!last->isLastInTagHistory())
    last++;
  return last->isLastInSelectorList() ? 0 : last + 1;
}

}  // namespace blink

#endif  // CSSSelectorList_h