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/*
* Copyright (C) 2006, 2007 Rob Buis
* Copyright (C) 2008-2016 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 "config.h"
#include "InlineStyleSheetOwner.h"
#include "AuthorStyleSheets.h"
#include "ContentSecurityPolicy.h"
#include "Element.h"
#include "MediaList.h"
#include "MediaQueryEvaluator.h"
#include "ScriptableDocumentParser.h"
#include "ShadowRoot.h"
#include "StyleSheetContents.h"
#include "TextNodeTraversal.h"
#include <wtf/NeverDestroyed.h>
#include <wtf/text/StringBuilder.h>
namespace WebCore {
InlineStyleSheetOwner::InlineStyleSheetOwner(Document& document, bool createdByParser)
: m_isParsingChildren(createdByParser)
, m_loading(false)
, m_startTextPosition()
{
if (createdByParser && document.scriptableDocumentParser() && !document.isInDocumentWrite())
m_startTextPosition = document.scriptableDocumentParser()->textPosition();
}
InlineStyleSheetOwner::~InlineStyleSheetOwner()
{
if (m_sheet)
clearSheet();
}
static AuthorStyleSheets& authorStyleSheetsForElement(Element& element)
{
auto* shadowRoot = element.containingShadowRoot();
return shadowRoot ? shadowRoot->authorStyleSheets() : element.document().authorStyleSheets();
}
void InlineStyleSheetOwner::insertedIntoDocument(Document&, Element& element)
{
authorStyleSheetsForElement(element).addStyleSheetCandidateNode(element, m_isParsingChildren);
if (m_isParsingChildren)
return;
createSheetFromTextContents(element);
}
void InlineStyleSheetOwner::removedFromDocument(Document& document, Element& element)
{
authorStyleSheetsForElement(element).removeStyleSheetCandidateNode(element);
if (m_sheet)
clearSheet();
// If we're in document teardown, then we don't need to do any notification of our sheet's removal.
if (document.hasLivingRenderTree())
document.styleResolverChanged(DeferRecalcStyle);
}
void InlineStyleSheetOwner::clearDocumentData(Document&, Element& element)
{
if (m_sheet)
m_sheet->clearOwnerNode();
if (!element.inDocument())
return;
authorStyleSheetsForElement(element).removeStyleSheetCandidateNode(element);
}
void InlineStyleSheetOwner::childrenChanged(Element& element)
{
if (m_isParsingChildren)
return;
if (!element.inDocument())
return;
createSheetFromTextContents(element);
}
void InlineStyleSheetOwner::finishParsingChildren(Element& element)
{
if (element.inDocument())
createSheetFromTextContents(element);
m_isParsingChildren = false;
}
void InlineStyleSheetOwner::createSheetFromTextContents(Element& element)
{
createSheet(element, TextNodeTraversal::contentsAsString(element));
}
void InlineStyleSheetOwner::clearSheet()
{
ASSERT(m_sheet);
m_sheet.release()->clearOwnerNode();
}
inline bool isValidCSSContentType(Element& element, const AtomicString& type)
{
if (type.isEmpty())
return true;
// FIXME: Should MIME types really be case sensitive in XML documents? Doesn't seem like they should,
// even though other things are case sensitive in that context. MIME types should never be case sensitive.
// We should verify this and then remove the isHTMLElement check here.
static NeverDestroyed<const AtomicString> cssContentType("text/css", AtomicString::ConstructFromLiteral);
return element.isHTMLElement() ? equalLettersIgnoringASCIICase(type, "text/css") : type == cssContentType;
}
void InlineStyleSheetOwner::createSheet(Element& element, const String& text)
{
ASSERT(element.inDocument());
Document& document = element.document();
if (m_sheet) {
if (m_sheet->isLoading())
document.authorStyleSheets().removePendingSheet();
clearSheet();
}
if (!isValidCSSContentType(element, m_contentType))
return;
if (!document.contentSecurityPolicy()->allowInlineStyle(document.url(), m_startTextPosition.m_line, element.isInUserAgentShadowTree()))
return;
RefPtr<MediaQuerySet> mediaQueries;
if (element.isHTMLElement())
mediaQueries = MediaQuerySet::createAllowingDescriptionSyntax(m_media);
else
mediaQueries = MediaQuerySet::create(m_media);
MediaQueryEvaluator screenEval(ASCIILiteral("screen"), true);
MediaQueryEvaluator printEval(ASCIILiteral("print"), true);
if (!screenEval.eval(mediaQueries.get()) && !printEval.eval(mediaQueries.get()))
return;
authorStyleSheetsForElement(element).addPendingSheet();
m_loading = true;
m_sheet = CSSStyleSheet::createInline(element, URL(), m_startTextPosition, document.encoding());
m_sheet->setMediaQueries(mediaQueries.release());
m_sheet->setTitle(element.title());
m_sheet->contents().parseStringAtPosition(text, m_startTextPosition, m_isParsingChildren);
m_loading = false;
if (m_sheet)
m_sheet->contents().checkLoaded();
}
bool InlineStyleSheetOwner::isLoading() const
{
if (m_loading)
return true;
return m_sheet && m_sheet->isLoading();
}
bool InlineStyleSheetOwner::sheetLoaded(Element& element)
{
if (isLoading())
return false;
authorStyleSheetsForElement(element).removePendingSheet();
return true;
}
void InlineStyleSheetOwner::startLoadingDynamicSheet(Element& element)
{
authorStyleSheetsForElement(element).addPendingSheet();
}
}
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