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/*
* Copyright (C) 2004, 2005, 2008 Nikolas Zimmermann <zimmermann@kde.org>
* Copyright (C) 2004, 2005, 2007 Rob Buis <buis@kde.org>
* Copyright (C) 2007 Eric Seidel <eric@webkit.org>
* Copyright (C) 2010-2019 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 "SVGAElement.h"
#include "DOMTokenList.h"
#include "Document.h"
#include "EventHandler.h"
#include "Frame.h"
#include "FrameLoader.h"
#include "FrameLoaderTypes.h"
#include "HTMLAnchorElement.h"
#include "HTMLParserIdioms.h"
#include "KeyboardEvent.h"
#include "LegacyRenderSVGTransformableContainer.h"
#include "MouseEvent.h"
#include "PlatformMouseEvent.h"
#include "RenderSVGInline.h"
#include "RenderSVGText.h"
#include "ResourceRequest.h"
#include "SVGElementInlines.h"
#include "SVGElementTypeHelpers.h"
#include "SVGNames.h"
#include "SVGSMILElement.h"
#include "XLinkNames.h"
#include <wtf/IsoMallocInlines.h>
namespace WebCore {
WTF_MAKE_ISO_ALLOCATED_IMPL(SVGAElement);
inline SVGAElement::SVGAElement(const QualifiedName& tagName, Document& document)
: SVGGraphicsElement(tagName, document)
, SVGURIReference(this)
{
ASSERT(hasTagName(SVGNames::aTag));
static std::once_flag onceFlag;
std::call_once(onceFlag, [] {
PropertyRegistry::registerProperty<SVGNames::targetAttr, &SVGAElement::m_target>();
});
}
Ref<SVGAElement> SVGAElement::create(const QualifiedName& tagName, Document& document)
{
return adoptRef(*new SVGAElement(tagName, document));
}
String SVGAElement::title() const
{
// If the xlink:title is set (non-empty string), use it.
const AtomString& title = attributeWithoutSynchronization(XLinkNames::titleAttr);
if (!title.isEmpty())
return title;
// Otherwise, use the title of this element.
return SVGElement::title();
}
void SVGAElement::parseAttribute(const QualifiedName& name, const AtomString& value)
{
if (name == SVGNames::targetAttr) {
m_target->setBaseValInternal(value);
return;
} else if (name == SVGNames::relAttr) {
if (m_relList)
m_relList->associatedAttributeValueChanged(value);
}
SVGGraphicsElement::parseAttribute(name, value);
SVGURIReference::parseAttribute(name, value);
}
void SVGAElement::svgAttributeChanged(const QualifiedName& attrName)
{
if (SVGURIReference::isKnownAttribute(attrName)) {
bool wasLink = isLink();
setIsLink(!href().isNull() && !shouldProhibitLinks(this));
if (wasLink != isLink()) {
InstanceInvalidationGuard guard(*this);
invalidateStyleForSubtree();
}
return;
}
SVGGraphicsElement::svgAttributeChanged(attrName);
}
RenderPtr<RenderElement> SVGAElement::createElementRenderer(RenderStyle&& style, const RenderTreePosition&)
{
if (is<SVGElement>(parentNode()) && downcast<SVGElement>(*parentNode()).isTextContent())
return createRenderer<RenderSVGInline>(*this, WTFMove(style));
return createRenderer<LegacyRenderSVGTransformableContainer>(*this, WTFMove(style));
}
void SVGAElement::defaultEventHandler(Event& event)
{
if (isLink()) {
if (focused() && isEnterKeyKeydownEvent(event)) {
event.setDefaultHandled();
dispatchSimulatedClick(&event);
return;
}
if (MouseEvent::canTriggerActivationBehavior(event)) {
String url = stripLeadingAndTrailingHTMLSpaces(href());
if (url[0] == '#') {
RefPtr targetElement = treeScope().getElementById(url.substringSharingImpl(1));
if (is<SVGSMILElement>(targetElement)) {
downcast<SVGSMILElement>(*targetElement).beginByLinkActivation();
event.setDefaultHandled();
return;
}
}
auto target = this->target();
if (target.isEmpty() && attributeWithoutSynchronization(XLinkNames::showAttr) == "new"_s)
target = blankTargetFrameName();
event.setDefaultHandled();
RefPtr frame = document().frame();
if (!frame)
return;
frame->loader().changeLocation(document().completeURL(url), target, &event, ReferrerPolicy::EmptyString, document().shouldOpenExternalURLsPolicyToPropagate());
return;
}
}
SVGGraphicsElement::defaultEventHandler(event);
}
int SVGAElement::defaultTabIndex() const
{
return 0;
}
bool SVGAElement::supportsFocus() const
{
if (hasEditableStyle())
return SVGGraphicsElement::supportsFocus();
// If not a link we should still be able to focus the element if it has a tabIndex.
return isLink() || SVGGraphicsElement::supportsFocus();
}
bool SVGAElement::isURLAttribute(const Attribute& attribute) const
{
return SVGURIReference::isKnownAttribute(attribute.name()) || SVGGraphicsElement::isURLAttribute(attribute);
}
bool SVGAElement::isMouseFocusable() const
{
// Links are focusable by default, but only allow links with tabindex or contenteditable to be mouse focusable.
// https://bugs.webkit.org/show_bug.cgi?id=26856
if (isLink())
return Element::supportsFocus();
return SVGElement::isMouseFocusable();
}
bool SVGAElement::isKeyboardFocusable(KeyboardEvent* event) const
{
if (isFocusable() && Element::supportsFocus())
return SVGElement::isKeyboardFocusable(event);
if (isLink())
return document().frame()->eventHandler().tabsToLinks(event);
return SVGElement::isKeyboardFocusable(event);
}
bool SVGAElement::canStartSelection() const
{
if (!isLink())
return SVGElement::canStartSelection();
return hasEditableStyle();
}
bool SVGAElement::childShouldCreateRenderer(const Node& child) const
{
// http://www.w3.org/2003/01/REC-SVG11-20030114-errata#linking-text-environment
// The 'a' element may contain any element that its parent may contain, except itself.
if (child.hasTagName(SVGNames::aTag))
return false;
if (parentElement() && parentElement()->isSVGElement())
return parentElement()->childShouldCreateRenderer(child);
return SVGElement::childShouldCreateRenderer(child);
}
bool SVGAElement::willRespondToMouseClickEventsWithEditability(Editability editability) const
{
return isLink() || SVGGraphicsElement::willRespondToMouseClickEventsWithEditability(editability);
}
SharedStringHash SVGAElement::visitedLinkHash() const
{
ASSERT(isLink());
if (!m_storedVisitedLinkHash)
m_storedVisitedLinkHash = computeVisitedLinkHash(document().baseURL(), getAttribute(SVGNames::hrefAttr, XLinkNames::hrefAttr));
return *m_storedVisitedLinkHash;
}
DOMTokenList& SVGAElement::relList()
{
if (!m_relList) {
m_relList = makeUnique<DOMTokenList>(*this, SVGNames::relAttr, [](Document&, StringView token) {
#if USE(SYSTEM_PREVIEW)
if (equalLettersIgnoringASCIICase(token, "ar"_s))
return true;
#endif
return equalLettersIgnoringASCIICase(token, "noreferrer"_s) || equalLettersIgnoringASCIICase(token, "noopener"_s);
});
}
return *m_relList;
}
} // namespace WebCore