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/*
* Copyright (C) 2009 Alex Milowski (alex@milowski.com). All rights reserved.
* Copyright (C) 2010 Apple Inc. All rights reserved.
* Copyright (C) 2010 François Sausset (sausset@gmail.com). All rights reserved.
* Copyright (C) 2016 Igalia S.L.
*
* 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 "MathMLElement.h"
#if ENABLE(MATHML)
#include "EventHandler.h"
#include "HTMLAnchorElement.h"
#include "HTMLParserIdioms.h"
#include "MathMLNames.h"
#include "MouseEvent.h"
#include "RenderTableCell.h"
namespace WebCore {
using namespace MathMLNames;
MathMLElement::MathMLElement(const QualifiedName& tagName, Document& document)
: StyledElement(tagName, document, CreateMathMLElement)
{
}
Ref<MathMLElement> MathMLElement::create(const QualifiedName& tagName, Document& document)
{
return adoptRef(*new MathMLElement(tagName, document));
}
unsigned MathMLElement::colSpan() const
{
if (!hasTagName(mtdTag))
return 1u;
auto& colSpanValue = attributeWithoutSynchronization(columnspanAttr);
return std::max(1u, limitToOnlyHTMLNonNegative(colSpanValue, 1u));
}
unsigned MathMLElement::rowSpan() const
{
if (!hasTagName(mtdTag))
return 1u;
auto& rowSpanValue = attributeWithoutSynchronization(rowspanAttr);
static const unsigned maxRowspan = 8190; // This constant comes from HTMLTableCellElement.
return std::max(1u, std::min(limitToOnlyHTMLNonNegative(rowSpanValue, 1u), maxRowspan));
}
void MathMLElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
{
if (name == hrefAttr) {
bool wasLink = isLink();
setIsLink(!value.isNull() && !shouldProhibitLinks(this));
if (wasLink != isLink())
invalidateStyleForSubtree();
} else if (name == rowspanAttr) {
if (is<RenderTableCell>(renderer()) && hasTagName(mtdTag))
downcast<RenderTableCell>(*renderer()).colSpanOrRowSpanChanged();
} else if (name == columnspanAttr) {
if (is<RenderTableCell>(renderer()) && hasTagName(mtdTag))
downcast<RenderTableCell>(renderer())->colSpanOrRowSpanChanged();
} else
StyledElement::parseAttribute(name, value);
}
bool MathMLElement::isPresentationAttribute(const QualifiedName& name) const
{
if (name == backgroundAttr || name == colorAttr || name == dirAttr || name == fontfamilyAttr || name == fontsizeAttr || name == fontstyleAttr || name == fontweightAttr || name == mathbackgroundAttr || name == mathcolorAttr || name == mathsizeAttr)
return true;
return StyledElement::isPresentationAttribute(name);
}
void MathMLElement::collectStyleForPresentationAttribute(const QualifiedName& name, const AtomicString& value, MutableStyleProperties& style)
{
if (name == mathbackgroundAttr)
addPropertyToPresentationAttributeStyle(style, CSSPropertyBackgroundColor, value);
else if (name == mathsizeAttr) {
// The following three values of mathsize are handled in WebCore/css/mathml.css
if (value != "normal" && value != "small" && value != "big")
addPropertyToPresentationAttributeStyle(style, CSSPropertyFontSize, value);
} else if (name == mathcolorAttr)
addPropertyToPresentationAttributeStyle(style, CSSPropertyColor, value);
// FIXME: deprecated attributes that should loose in a conflict with a non deprecated attribute
else if (name == fontsizeAttr)
addPropertyToPresentationAttributeStyle(style, CSSPropertyFontSize, value);
else if (name == backgroundAttr)
addPropertyToPresentationAttributeStyle(style, CSSPropertyBackgroundColor, value);
else if (name == colorAttr)
addPropertyToPresentationAttributeStyle(style, CSSPropertyColor, value);
else if (name == fontstyleAttr)
addPropertyToPresentationAttributeStyle(style, CSSPropertyFontStyle, value);
else if (name == fontweightAttr)
addPropertyToPresentationAttributeStyle(style, CSSPropertyFontWeight, value);
else if (name == fontfamilyAttr)
addPropertyToPresentationAttributeStyle(style, CSSPropertyFontFamily, value);
else if (name == dirAttr) {
if (hasTagName(mathTag) || hasTagName(mrowTag) || hasTagName(mstyleTag) || isMathMLToken())
addPropertyToPresentationAttributeStyle(style, CSSPropertyDirection, value);
} else {
ASSERT(!isPresentationAttribute(name));
StyledElement::collectStyleForPresentationAttribute(name, value
, style);
}
}
bool MathMLElement::childShouldCreateRenderer(const Node& child) const
{
// In general, only MathML children are allowed. Text nodes are only visible in token MathML elements.
return is<MathMLElement>(child);
}
bool MathMLElement::willRespondToMouseClickEvents()
{
return isLink() || StyledElement::willRespondToMouseClickEvents();
}
void MathMLElement::defaultEventHandler(Event& event)
{
if (isLink()) {
if (focused() && isEnterKeyKeydownEvent(event)) {
event.setDefaultHandled();
dispatchSimulatedClick(&event);
return;
}
if (MouseEvent::canTriggerActivationBehavior(event)) {
auto& href = attributeWithoutSynchronization(hrefAttr);
const auto& url = stripLeadingAndTrailingHTMLSpaces(href);
event.setDefaultHandled();
if (auto* frame = document().frame())
frame->loader().urlSelected(document().completeURL(url), "_self", &event, LockHistory::No, LockBackForwardList::No, MaybeSendReferrer, document().shouldOpenExternalURLsPolicyToPropagate());
return;
}
}
StyledElement::defaultEventHandler(event);
}
bool MathMLElement::canStartSelection() const
{
if (!isLink())
return StyledElement::canStartSelection();
return hasEditableStyle();
}
bool MathMLElement::isFocusable() const
{
if (renderer() && renderer()->absoluteClippedOverflowRect().isEmpty())
return false;
return StyledElement::isFocusable();
}
bool MathMLElement::isKeyboardFocusable(KeyboardEvent& event) const
{
if (isFocusable() && StyledElement::supportsFocus())
return StyledElement::isKeyboardFocusable(event);
if (isLink())
return document().frame()->eventHandler().tabsToLinks(event);
return StyledElement::isKeyboardFocusable(event);
}
bool MathMLElement::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 StyledElement::supportsFocus();
return StyledElement::isMouseFocusable();
}
bool MathMLElement::isURLAttribute(const Attribute& attribute) const
{
return attribute.name().localName() == hrefAttr || StyledElement::isURLAttribute(attribute);
}
bool MathMLElement::supportsFocus() const
{
if (hasEditableStyle())
return StyledElement::supportsFocus();
// If not a link we should still be able to focus the element if it has tabIndex.
return isLink() || StyledElement::supportsFocus();
}
int MathMLElement::tabIndex() const
{
// Skip the supportsFocus check in StyledElement.
return Element::tabIndex();
}
StringView MathMLElement::stripLeadingAndTrailingWhitespace(const StringView& stringView)
{
unsigned start = 0, stringLength = stringView.length();
while (stringLength > 0 && isHTMLSpace(stringView[start])) {
start++;
stringLength--;
}
while (stringLength > 0 && isHTMLSpace(stringView[start + stringLength - 1]))
stringLength--;
return stringView.substring(start, stringLength);
}
}
#endif // ENABLE(MATHML)
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