third_party/WebKit/Source/core/css/parser/CSSParserSelector.cpp

/*
 * Copyright (C) 2003 Lars Knoll (knoll@kde.org)
 * Copyright (C) 2004, 2005, 2006, 2008 Apple Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#include "core/css/parser/CSSParserSelector.h"

#include "core/css/CSSSelectorList.h"
#include "wtf/PtrUtil.h"
#include <memory>

namespace blink {

CSSParserSelector::CSSParserSelector()
    : m_selector(wrapUnique(new CSSSelector())) {}

CSSParserSelector::CSSParserSelector(const QualifiedName& tagQName,
                                     bool isImplicit)
    : m_selector(wrapUnique(new CSSSelector(tagQName, isImplicit))) {}

CSSParserSelector::~CSSParserSelector() {
  if (!m_tagHistory)
    return;
  Vector<std::unique_ptr<CSSParserSelector>, 16> toDelete;
  std::unique_ptr<CSSParserSelector> selector = std::move(m_tagHistory);
  while (true) {
    std::unique_ptr<CSSParserSelector> next = std::move(selector->m_tagHistory);
    toDelete.append(std::move(selector));
    if (!next)
      break;
    selector = std::move(next);
  }
}

void CSSParserSelector::adoptSelectorVector(
    Vector<std::unique_ptr<CSSParserSelector>>& selectorVector) {
  CSSSelectorList* selectorList =
      new CSSSelectorList(CSSSelectorList::adoptSelectorVector(selectorVector));
  m_selector->setSelectorList(wrapUnique(selectorList));
}

void CSSParserSelector::setSelectorList(
    std::unique_ptr<CSSSelectorList> selectorList) {
  m_selector->setSelectorList(std::move(selectorList));
}

bool CSSParserSelector::isSimple() const {
  if (m_selector->selectorList() ||
      m_selector->match() == CSSSelector::PseudoElement)
    return false;

  if (!m_tagHistory)
    return true;

  if (m_selector->match() == CSSSelector::Tag) {
    // We can't check against anyQName() here because namespace may not be
    // nullAtom.
    // Example:
    //     @namespace "http://www.w3.org/2000/svg";
    //     svg:not(:root) { ...
    if (m_selector->tagQName().localName() == starAtom)
      return m_tagHistory->isSimple();
  }

  return false;
}

void CSSParserSelector::appendTagHistory(
    CSSSelector::RelationType relation,
    std::unique_ptr<CSSParserSelector> selector) {
  CSSParserSelector* end = this;
  while (end->tagHistory())
    end = end->tagHistory();
  end->setRelation(relation);
  end->setTagHistory(std::move(selector));
}

std::unique_ptr<CSSParserSelector> CSSParserSelector::releaseTagHistory() {
  setRelation(CSSSelector::SubSelector);
  return std::move(m_tagHistory);
}

void CSSParserSelector::prependTagSelector(const QualifiedName& tagQName,
                                           bool isImplicit) {
  std::unique_ptr<CSSParserSelector> second = CSSParserSelector::create();
  second->m_selector = std::move(m_selector);
  second->m_tagHistory = std::move(m_tagHistory);
  m_tagHistory = std::move(second);
  m_selector = wrapUnique(new CSSSelector(tagQName, isImplicit));
}

bool CSSParserSelector::isHostPseudoSelector() const {
  return pseudoType() == CSSSelector::PseudoHost ||
         pseudoType() == CSSSelector::PseudoHostContext;
}

}  // namespace blink