third_party/WebKit/Source/core/css/CSSImportRule.cpp

/*
 * (C) 1999-2003 Lars Knoll (knoll@kde.org)
 * (C) 2002-2003 Dirk Mueller (mueller@kde.org)
 * Copyright (C) 2002, 2005, 2006, 2008, 2009, 2010, 2012 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/CSSImportRule.h"

#include "core/css/CSSStyleSheet.h"
#include "core/css/MediaList.h"
#include "core/css/StyleRuleImport.h"
#include "core/css/StyleSheetContents.h"
#include "wtf/text/StringBuilder.h"

namespace blink {

CSSImportRule::CSSImportRule(StyleRuleImport* importRule, CSSStyleSheet* parent)
    : CSSRule(parent), m_importRule(importRule) {}

CSSImportRule::~CSSImportRule() {}

String CSSImportRule::href() const {
  return m_importRule->href();
}

MediaList* CSSImportRule::media() const {
  if (!m_mediaCSSOMWrapper)
    m_mediaCSSOMWrapper = MediaList::create(m_importRule->mediaQueries(),
                                            const_cast<CSSImportRule*>(this));
  return m_mediaCSSOMWrapper.get();
}

String CSSImportRule::cssText() const {
  StringBuilder result;
  result.append("@import url(\"");
  result.append(m_importRule->href());
  result.append("\")");

  if (m_importRule->mediaQueries()) {
    String mediaText = m_importRule->mediaQueries()->mediaText();
    if (!mediaText.isEmpty()) {
      result.append(' ');
      result.append(mediaText);
    }
  }
  result.append(';');

  return result.toString();
}

CSSStyleSheet* CSSImportRule::styleSheet() const {
  // TODO(yukishiino): CSSImportRule.styleSheet attribute is not nullable,
  // thus this function must not return nullptr.
  if (!m_importRule->styleSheet())
    return nullptr;

  if (!m_styleSheetCSSOMWrapper)
    m_styleSheetCSSOMWrapper = CSSStyleSheet::create(
        m_importRule->styleSheet(), const_cast<CSSImportRule*>(this));
  return m_styleSheetCSSOMWrapper.get();
}

void CSSImportRule::reattach(StyleRuleBase*) {
  // FIXME: Implement when enabling caching for stylesheets with import rules.
  ASSERT_NOT_REACHED();
}

DEFINE_TRACE(CSSImportRule) {
  visitor->trace(m_importRule);
  visitor->trace(m_mediaCSSOMWrapper);
  visitor->trace(m_styleSheetCSSOMWrapper);
  CSSRule::trace(visitor);
}

}  // namespace blink