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/*
* Copyright (C) 2013 The MathJax Consortium. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "MathMLSelectElement.h"
#if ENABLE(MATHML)
#include "ElementInlines.h"
#include "Event.h"
#include "EventNames.h"
#include "HTMLElement.h"
#include "HTMLNames.h"
#include "MathMLNames.h"
#include "RenderMathMLRow.h"
#include "RenderTreeUpdater.h"
#include "SVGElement.h"
#include <wtf/IsoMallocInlines.h>
namespace WebCore {
WTF_MAKE_ISO_ALLOCATED_IMPL(MathMLSelectElement);
using namespace MathMLNames;
MathMLSelectElement::MathMLSelectElement(const QualifiedName& tagName, Document& document)
: MathMLRowElement(tagName, document)
, m_selectedChild(nullptr)
{
}
Ref<MathMLSelectElement> MathMLSelectElement::create(const QualifiedName& tagName, Document& document)
{
return adoptRef(*new MathMLSelectElement(tagName, document));
}
RenderPtr<RenderElement> MathMLSelectElement::createElementRenderer(RenderStyle&& style, const RenderTreePosition&)
{
return createRenderer<RenderMathMLRow>(*this, WTFMove(style));
}
// We recognize the following values for the encoding attribute of the <semantics> element:
//
// - "MathML-Presentation", which is mentioned in the MathML 3 recommendation.
// - "SVG1.1" which is mentioned in the W3C note.
// http://www.w3.org/Math/Documents/Notes/graphics.xml
// - Other MIME Content-Types for MathML, SVG and HTML.
//
// We exclude "application/mathml+xml" which is ambiguous about whether it is Presentation or Content MathML. Authors must use a more explicit encoding value.
bool MathMLSelectElement::isMathMLEncoding(const AtomString& value)
{
return value == "application/mathml-presentation+xml"_s || value == "MathML-Presentation"_s;
}
bool MathMLSelectElement::isSVGEncoding(const AtomString& value)
{
return value == "image/svg+xml"_s || value == "SVG1.1"_s;
}
bool MathMLSelectElement::isHTMLEncoding(const AtomString& value)
{
return value == "application/xhtml+xml"_s || value == "text/html"_s;
}
bool MathMLSelectElement::childShouldCreateRenderer(const Node& child) const
{
return MathMLElement::childShouldCreateRenderer(child) && m_selectedChild == &child;
}
void MathMLSelectElement::finishParsingChildren()
{
updateSelectedChild();
MathMLRowElement::finishParsingChildren();
}
void MathMLSelectElement::childrenChanged(const ChildChange& change)
{
updateSelectedChild();
MathMLRowElement::childrenChanged(change);
}
void MathMLSelectElement::attributeChanged(const QualifiedName& name, const AtomString& oldValue, const AtomString& newValue, AttributeModificationReason reason)
{
if (hasTagName(mactionTag) && (name == MathMLNames::actiontypeAttr || name == MathMLNames::selectionAttr))
updateSelectedChild();
MathMLRowElement::attributeChanged(name, oldValue, newValue, reason);
}
int MathMLSelectElement::getSelectedActionChildAndIndex(Element*& selectedChild)
{
ASSERT(hasTagName(mactionTag));
// We "round up or down to the closest allowable value" of the selection attribute, as suggested by the MathML specification.
selectedChild = firstElementChild();
if (!selectedChild)
return 1;
int selection = getIntegralAttribute(MathMLNames::selectionAttr);
int i;
for (i = 1; i < selection; i++) {
auto* nextChild = selectedChild->nextElementSibling();
if (!nextChild)
break;
selectedChild = nextChild;
}
return i;
}
Element* MathMLSelectElement::getSelectedActionChild()
{
ASSERT(hasTagName(mactionTag));
auto* child = firstElementChild();
if (!child)
return child;
// The value of the actiontype attribute is case-sensitive.
auto& actiontype = attributeWithoutSynchronization(MathMLNames::actiontypeAttr);
if (actiontype == "statusline"_s) {
// FIXME: implement user interaction for the "statusline" action type (http://wkbug/124922).
{ }
} else if (actiontype == "tooltip"_s) {
// FIXME: implement user interaction for the "tooltip" action type (http://wkbug/124921).
{ }
} else {
// For the "toggle" action type or any unknown action type, we rely on the value of the selection attribute to determine the visible child.
getSelectedActionChildAndIndex(child);
}
return child;
}
Element* MathMLSelectElement::getSelectedSemanticsChild()
{
ASSERT(hasTagName(semanticsTag));
auto* child = firstElementChild();
if (!child)
return nullptr;
if (!is<MathMLElement>(*child) || !downcast<MathMLElement>(*child).isPresentationMathML()) {
// The first child is not a presentation MathML element. Hence we move to the second child and start searching an annotation child that could be displayed.
child = child->nextElementSibling();
} else if (!downcast<MathMLElement>(*child).isSemanticAnnotation()) {
// The first child is a presentation MathML but not an annotation, so we can just display it.
return child;
}
// Otherwise, the first child is an <annotation> or <annotation-xml> element. This is invalid, but some people use this syntax so we take care of this case too and start the search from this first child.
for ( ; child; child = child->nextElementSibling()) {
if (!is<MathMLElement>(*child))
continue;
if (child->hasTagName(MathMLNames::annotationTag)) {
// If the <annotation> element has an src attribute then it is a reference to arbitrary binary data and it is not clear whether we can display it. Hence we just ignore the annotation.
if (child->hasAttributeWithoutSynchronization(MathMLNames::srcAttr))
continue;
// Otherwise, we assume it is a text annotation that can always be displayed and we stop here.
return child;
}
if (child->hasTagName(MathMLNames::annotation_xmlTag)) {
// If the <annotation-xml> element has an src attribute then it is a reference to arbitrary binary data and it is not clear whether we can display it. Hence we just ignore the annotation.
if (child->hasAttributeWithoutSynchronization(MathMLNames::srcAttr))
continue;
// If the <annotation-xml> element has an encoding attribute describing presentation MathML, SVG or HTML we assume the content can be displayed and we stop here.
auto& value = child->attributeWithoutSynchronization(MathMLNames::encodingAttr);
if (isMathMLEncoding(value) || isSVGEncoding(value) || isHTMLEncoding(value))
return child;
}
}
// We fallback to the first child.
return firstElementChild();
}
void MathMLSelectElement::updateSelectedChild()
{
auto* newSelectedChild = hasTagName(mactionTag) ? getSelectedActionChild() : getSelectedSemanticsChild();
if (m_selectedChild == newSelectedChild)
return;
if (m_selectedChild && m_selectedChild->renderer())
RenderTreeUpdater::tearDownRenderers(*m_selectedChild);
m_selectedChild = newSelectedChild;
invalidateStyleForSubtree();
}
void MathMLSelectElement::defaultEventHandler(Event& event)
{
if (event.type() == eventNames().clickEvent) {
if (attributeWithoutSynchronization(MathMLNames::actiontypeAttr) == "toggle"_s) {
toggle();
event.setDefaultHandled();
return;
}
}
MathMLRowElement::defaultEventHandler(event);
}
bool MathMLSelectElement::willRespondToMouseClickEventsWithEditability(Editability editability) const
{
return attributeWithoutSynchronization(MathMLNames::actiontypeAttr) == "toggle"_s || MathMLRowElement::willRespondToMouseClickEventsWithEditability(editability);
}
void MathMLSelectElement::toggle()
{
// Select the successor of the currently selected child
// or the first child if the currently selected child is the last.
Element* selectedChild;
int newSelectedChildIndex = getSelectedActionChildAndIndex(selectedChild) + 1;
if (!selectedChild || !selectedChild->nextElementSibling())
newSelectedChildIndex = 1;
// We update the attribute value of the selection attribute.
// This will also call MathMLSelectElement::attributeChanged to update the selected child.
setAttributeWithoutSynchronization(MathMLNames::selectionAttr, AtomString::number(newSelectedChildIndex));
}
}
#endif // ENABLE(MATHML)