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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* (C) 2001 Dirk Mueller (mueller@kde.org)
* Copyright (C) 2003-2023 Apple Inc. All rights reserved.
* Copyright (C) 2013 Google 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 "HTMLMetaElement.h"
#include "Attribute.h"
#include "CSSParser.h"
#include "Color.h"
#include "Document.h"
#include "ElementInlines.h"
#include "HTMLHeadElement.h"
#include "HTMLNames.h"
#include "HTMLParserIdioms.h"
#include "LocalFrame.h"
#include "LocalFrameView.h"
#include "MediaQueryEvaluator.h"
#include "MediaQueryParser.h"
#include "MediaQueryParserContext.h"
#include "NodeName.h"
#include "Quirks.h"
#include "RenderStyle.h"
#include "Settings.h"
#include "StyleResolveForDocument.h"
#include <wtf/IsoMallocInlines.h>
namespace WebCore {
WTF_MAKE_ISO_ALLOCATED_IMPL(HTMLMetaElement);
using namespace HTMLNames;
inline HTMLMetaElement::HTMLMetaElement(const QualifiedName& tagName, Document& document)
: HTMLElement(tagName, document)
{
ASSERT(hasTagName(metaTag));
}
Ref<HTMLMetaElement> HTMLMetaElement::create(Document& document)
{
return adoptRef(*new HTMLMetaElement(metaTag, document));
}
Ref<HTMLMetaElement> HTMLMetaElement::create(const QualifiedName& tagName, Document& document)
{
return adoptRef(*new HTMLMetaElement(tagName, document));
}
bool HTMLMetaElement::mediaAttributeMatches()
{
auto& document = this->document();
if (!m_mediaQueryList) {
auto mediaText = attributeWithoutSynchronization(mediaAttr).convertToASCIILowercase();
m_mediaQueryList = MQ::MediaQueryParser::parse(mediaText, { document });
}
std::optional<RenderStyle> documentStyle;
if (document.hasLivingRenderTree())
documentStyle = Style::resolveForDocument(document);
AtomString mediaType;
if (auto* frame = document.frame()) {
if (auto* frameView = frame->view())
mediaType = frameView->mediaType();
}
auto evaluator = MQ::MediaQueryEvaluator { mediaType, document, documentStyle ? &*documentStyle : nullptr };
return evaluator.evaluate(*m_mediaQueryList);
}
const Color& HTMLMetaElement::contentColor()
{
if (!m_contentColor)
m_contentColor = CSSParser::parseColorWithoutContext(content());
return *m_contentColor;
}
void HTMLMetaElement::attributeChanged(const QualifiedName& name, const AtomString& oldValue, const AtomString& newValue, AttributeModificationReason attributeModificationReason)
{
HTMLElement::attributeChanged(name, oldValue, newValue, attributeModificationReason);
switch (name.nodeName()) {
case AttributeNames::nameAttr:
process();
if (isInDocumentTree()) {
if (equalLettersIgnoringASCIICase(oldValue, "theme-color"_s) && !equalLettersIgnoringASCIICase(newValue, "theme-color"_s))
document().metaElementThemeColorChanged(*this);
}
break;
case AttributeNames::contentAttr:
m_contentColor = std::nullopt;
process();
break;
case AttributeNames::http_equivAttr:
process();
break;
case AttributeNames::mediaAttr:
m_mediaQueryList = { };
process();
break;
default:
break;
}
}
Node::InsertedIntoAncestorResult HTMLMetaElement::insertedIntoAncestor(InsertionType insertionType, ContainerNode& parentOfInsertedTree)
{
HTMLElement::insertedIntoAncestor(insertionType, parentOfInsertedTree);
if (insertionType.connectedToDocument)
return InsertedIntoAncestorResult::NeedsPostInsertionCallback;
return InsertedIntoAncestorResult::Done;
}
void HTMLMetaElement::didFinishInsertingNode()
{
process();
}
void HTMLMetaElement::removedFromAncestor(RemovalType removalType, ContainerNode& oldParentOfRemovedTree)
{
HTMLElement::removedFromAncestor(removalType, oldParentOfRemovedTree);
if (removalType.disconnectedFromDocument && equalLettersIgnoringASCIICase(name(), "theme-color"_s))
oldParentOfRemovedTree.document().metaElementThemeColorChanged(*this);
}
void HTMLMetaElement::process()
{
// Changing a meta tag while it's not in the document tree shouldn't have any effect on the document.
if (!isInDocumentTree())
return;
// https://html.spec.whatwg.org/multipage/semantics.html#the-meta-element
// All below situations require a content attribute (which can be the empty string).
const AtomString& contentValue = attributeWithoutSynchronization(contentAttr);
if (contentValue.isNull())
return;
const AtomString& httpEquivValue = attributeWithoutSynchronization(http_equivAttr);
// Get the document to process the tag, but only if we're actually part of DOM
// tree (changing a meta tag while it's not in the tree shouldn't have any effect
// on the document)
if (!httpEquivValue.isNull())
document().processMetaHttpEquiv(httpEquivValue, contentValue, isDescendantOf(document().head()));
const AtomString& nameValue = attributeWithoutSynchronization(nameAttr);
if (nameValue.isNull())
return;
if (equalLettersIgnoringASCIICase(nameValue, "viewport"_s))
document().processViewport(contentValue, ViewportArguments::ViewportMeta);
else if (document().settings().disabledAdaptationsMetaTagEnabled() && equalLettersIgnoringASCIICase(nameValue, "disabled-adaptations"_s))
document().processDisabledAdaptations(contentValue);
#if ENABLE(DARK_MODE_CSS)
else if (equalLettersIgnoringASCIICase(nameValue, "color-scheme"_s) || equalLettersIgnoringASCIICase(nameValue, "supported-color-schemes"_s))
document().processColorScheme(contentValue);
#endif
else if (equalLettersIgnoringASCIICase(nameValue, "theme-color"_s))
document().metaElementThemeColorChanged(*this);
#if PLATFORM(IOS_FAMILY)
else if (equalLettersIgnoringASCIICase(nameValue, "format-detection"_s))
document().processFormatDetection(contentValue);
else if (equalLettersIgnoringASCIICase(nameValue, "apple-mobile-web-app-orientations"_s))
document().processWebAppOrientations();
#endif
else if (equalLettersIgnoringASCIICase(nameValue, "referrer"_s))
document().processReferrerPolicy(contentValue, ReferrerPolicySource::MetaTag);
else if (equalLettersIgnoringASCIICase(nameValue, "confluence-request-time"_s))
document().quirks().setNeedsToCopyUserSelectNoneQuirk();
}
const AtomString& HTMLMetaElement::content() const
{
return attributeWithoutSynchronization(contentAttr);
}
const AtomString& HTMLMetaElement::httpEquiv() const
{
return attributeWithoutSynchronization(http_equivAttr);
}
const AtomString& HTMLMetaElement::name() const
{
return getNameAttribute();
}
}
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