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

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

#include "core/css/CSSSelector.h"
#include "core/css/CSSStyleSheet.h"
#include "core/css/PropertySetCSSStyleDeclaration.h"
#include "core/css/StylePropertySet.h"
#include "core/css/StyleRule.h"
#include "core/css/parser/CSSParser.h"
#include "wtf/text/StringBuilder.h"

namespace blink {

CSSPageRule::CSSPageRule(StyleRulePage* pageRule, CSSStyleSheet* parent)
    : CSSRule(parent)
    , m_pageRule(pageRule)
{
}

CSSPageRule::~CSSPageRule()
{
}

CSSStyleDeclaration* CSSPageRule::style() const
{
    if (!m_propertiesCSSOMWrapper)
        m_propertiesCSSOMWrapper = StyleRuleCSSStyleDeclaration::create(m_pageRule->mutableProperties(), const_cast<CSSPageRule*>(this));
    return m_propertiesCSSOMWrapper.get();
}

String CSSPageRule::selectorText() const
{
    StringBuilder text;
    const CSSSelector* selector = m_pageRule->selector();
    if (selector) {
        String pageSpecification = selector->selectorText();
        if (!pageSpecification.isEmpty())
            text.append(pageSpecification);
    }
    return text.toString();
}

void CSSPageRule::setSelectorText(const String& selectorText)
{
    CSSParserContext context(parserContext(), nullptr);
    CSSSelectorList selectorList = CSSParser::parsePageSelector(context, parentStyleSheet() ? parentStyleSheet()->contents() : nullptr, selectorText);
    if (!selectorList.isValid())
        return;

    CSSStyleSheet::RuleMutationScope mutationScope(this);

    m_pageRule->wrapperAdoptSelectorList(std::move(selectorList));
}

String CSSPageRule::cssText() const
{
    StringBuilder result;
    result.append("@page ");
    String pageSelectors = selectorText();
    result.append(pageSelectors);
    if (!pageSelectors.isEmpty())
        result.append(' ');
    result.append("{ ");
    String decls = m_pageRule->properties().asText();
    result.append(decls);
    if (!decls.isEmpty())
        result.append(' ');
    result.append('}');
    return result.toString();
}

void CSSPageRule::reattach(StyleRuleBase* rule)
{
    ASSERT(rule);
    m_pageRule = toStyleRulePage(rule);
    if (m_propertiesCSSOMWrapper)
        m_propertiesCSSOMWrapper->reattach(m_pageRule->mutableProperties());
}

DEFINE_TRACE(CSSPageRule)
{
    visitor->trace(m_pageRule);
    visitor->trace(m_propertiesCSSOMWrapper);
    CSSRule::trace(visitor);
}

} // namespace blink