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9ad02dda76
gecko-dev/dom/mathml/MathMLElement.cpp
Frederic Wang 9ad02dda76 Bug 1788637 - Remove MathML preferences scriptminsize_attribute and scriptsizemultiplier_attribute. r=emilio 
This commit removes the runtime flags and related code for the
scriptminsize and scriptsizemultiplier, which have been disabled by
default for a while. The hardcoded default values
kMathMLDefaultScriptSizeMultiplier and kMathMLDefaultScriptMinSizePt
are still used in some places and are preserved for now.

Differential Revision: https://phabricator.services.mozilla.com/D157426
2023-07-24 10:02:24 +00:00

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25 KiB
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/dom/MathMLElement.h"
#include "base/compiler_specific.h"
#include "mozilla/dom/BindContext.h"
#include "mozilla/ArrayUtils.h"
#include "mozilla/EventListenerManager.h"
#include "mozilla/FontPropertyTypes.h"
#include "mozilla/StaticPrefs_mathml.h"
#include "mozilla/TextUtils.h"
#include "nsGkAtoms.h"
#include "nsIContentInlines.h"
#include "nsITableCellLayout.h" // for MAX_COLSPAN / MAX_ROWSPAN
#include "nsCSSValue.h"
#include "nsStyleConsts.h"
#include "mozilla/dom/Document.h"
#include "nsPresContext.h"
#include "mozAutoDocUpdate.h"
#include "nsIScriptError.h"
#include "nsContentUtils.h"
#include "nsIURI.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/MappedDeclarationsBuilder.h"
#include "mozilla/dom/MathMLElementBinding.h"
using namespace mozilla;
using namespace mozilla::dom;
//----------------------------------------------------------------------
// nsISupports methods:
NS_IMPL_ISUPPORTS_INHERITED(MathMLElement, MathMLElementBase, Link)
static nsresult ReportLengthParseError(const nsString& aValue,
Document* aDocument) {
AutoTArray<nsString, 1> arg = {aValue};
return nsContentUtils::ReportToConsole(
nsIScriptError::errorFlag, "MathML"_ns, aDocument,
nsContentUtils::eMATHML_PROPERTIES, "LengthParsingError", arg);
}
static nsresult ReportParseErrorNoTag(const nsString& aValue, nsAtom* aAtom,
Document& aDocument) {
AutoTArray<nsString, 2> argv = {aValue, nsDependentAtomString(aAtom)};
return nsContentUtils::ReportToConsole(
nsIScriptError::errorFlag, "MathML"_ns, &aDocument,
nsContentUtils::eMATHML_PROPERTIES, "AttributeParsingErrorNoTag", argv);
}
MathMLElement::MathMLElement(
already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo)
: MathMLElementBase(std::move(aNodeInfo)),
ALLOW_THIS_IN_INITIALIZER_LIST(Link(this)),
mIncrementScriptLevel(false) {}
MathMLElement::MathMLElement(
already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo)
: MathMLElementBase(std::move(aNodeInfo)),
ALLOW_THIS_IN_INITIALIZER_LIST(Link(this)),
mIncrementScriptLevel(false) {}
nsresult MathMLElement::BindToTree(BindContext& aContext, nsINode& aParent) {
Link::ResetLinkState(false, Link::ElementHasHref());
nsresult rv = MathMLElementBase::BindToTree(aContext, aParent);
NS_ENSURE_SUCCESS(rv, rv);
// FIXME(emilio): Probably should be composed, this uses all the other link
// infrastructure.
if (Document* doc = aContext.GetUncomposedDoc()) {
doc->RegisterPendingLinkUpdate(this);
}
// Set the bit in the document for telemetry.
if (Document* doc = aContext.GetComposedDoc()) {
doc->SetMathMLEnabled();
}
return rv;
}
void MathMLElement::UnbindFromTree(bool aNullParent) {
// Without removing the link state we risk a dangling pointer
// in the mStyledLinks hashtable
Link::ResetLinkState(false, Link::ElementHasHref());
MathMLElementBase::UnbindFromTree(aNullParent);
}
bool MathMLElement::ParseAttribute(int32_t aNamespaceID, nsAtom* aAttribute,
const nsAString& aValue,
nsIPrincipal* aMaybeScriptedPrincipal,
nsAttrValue& aResult) {
MOZ_ASSERT(IsMathMLElement());
if (aNamespaceID == kNameSpaceID_None) {
if (aAttribute == nsGkAtoms::color || aAttribute == nsGkAtoms::mathcolor_ ||
aAttribute == nsGkAtoms::background ||
aAttribute == nsGkAtoms::mathbackground_) {
return aResult.ParseColor(aValue);
}
if (aAttribute == nsGkAtoms::tabindex) {
return aResult.ParseIntValue(aValue);
}
if (mNodeInfo->Equals(nsGkAtoms::mtd_)) {
if (aAttribute == nsGkAtoms::columnspan_) {
aResult.ParseClampedNonNegativeInt(aValue, 1, 1, MAX_COLSPAN);
return true;
}
if (aAttribute == nsGkAtoms::rowspan) {
aResult.ParseClampedNonNegativeInt(aValue, 1, 0, MAX_ROWSPAN);
return true;
}
}
}
return MathMLElementBase::ParseAttribute(aNamespaceID, aAttribute, aValue,
aMaybeScriptedPrincipal, aResult);
}
// https://mathml-refresh.github.io/mathml-core/#global-attributes
static Element::MappedAttributeEntry sGlobalAttributes[] = {
{nsGkAtoms::dir},
{nsGkAtoms::mathbackground_},
{nsGkAtoms::mathcolor_},
{nsGkAtoms::mathsize_},
{nsGkAtoms::scriptlevel_},
{nsGkAtoms::displaystyle_},
{nullptr}};
bool MathMLElement::IsAttributeMapped(const nsAtom* aAttribute) const {
MOZ_ASSERT(IsMathMLElement());
static const MappedAttributeEntry* const globalMap[] = {sGlobalAttributes};
return FindAttributeDependence(aAttribute, globalMap) ||
((!StaticPrefs::mathml_legacy_mathvariant_attribute_disabled() ||
mNodeInfo->Equals(nsGkAtoms::mi_)) &&
aAttribute == nsGkAtoms::mathvariant_) ||
(mNodeInfo->Equals(nsGkAtoms::mtable_) &&
aAttribute == nsGkAtoms::width);
}
nsMapRuleToAttributesFunc MathMLElement::GetAttributeMappingFunction() const {
if (mNodeInfo->Equals(nsGkAtoms::mtable_)) {
return &MapMTableAttributesInto;
}
if (StaticPrefs::mathml_legacy_mathvariant_attribute_disabled() &&
mNodeInfo->Equals(nsGkAtoms::mi_)) {
return &MapMiAttributesInto;
}
return &MapGlobalMathMLAttributesInto;
}
/* static */
bool MathMLElement::ParseNamedSpaceValue(const nsString& aString,
nsCSSValue& aCSSValue, uint32_t aFlags,
const Document& aDocument) {
if (StaticPrefs::mathml_mathspace_names_disabled()) {
return false;
}
int32_t i = 0;
// See if it is one of the 'namedspace' (ranging -7/18em, -6/18, ... 7/18em)
if (aString.EqualsLiteral("veryverythinmathspace")) {
i = 1;
} else if (aString.EqualsLiteral("verythinmathspace")) {
i = 2;
} else if (aString.EqualsLiteral("thinmathspace")) {
i = 3;
} else if (aString.EqualsLiteral("mediummathspace")) {
i = 4;
} else if (aString.EqualsLiteral("thickmathspace")) {
i = 5;
} else if (aString.EqualsLiteral("verythickmathspace")) {
i = 6;
} else if (aString.EqualsLiteral("veryverythickmathspace")) {
i = 7;
} else if (aFlags & PARSE_ALLOW_NEGATIVE) {
if (aString.EqualsLiteral("negativeveryverythinmathspace")) {
i = -1;
} else if (aString.EqualsLiteral("negativeverythinmathspace")) {
i = -2;
} else if (aString.EqualsLiteral("negativethinmathspace")) {
i = -3;
} else if (aString.EqualsLiteral("negativemediummathspace")) {
i = -4;
} else if (aString.EqualsLiteral("negativethickmathspace")) {
i = -5;
} else if (aString.EqualsLiteral("negativeverythickmathspace")) {
i = -6;
} else if (aString.EqualsLiteral("negativeveryverythickmathspace")) {
i = -7;
}
}
if (0 != i) {
aDocument.WarnOnceAbout(
dom::DeprecatedOperations::eMathML_DeprecatedMathSpaceValue);
aCSSValue.SetFloatValue(float(i) / float(18), eCSSUnit_EM);
return true;
}
return false;
}
// The REC says:
//
// "Most presentation elements have attributes that accept values representing
// lengths to be used for size, spacing or similar properties. The syntax of a
// length is specified as
//
// number | number unit | namedspace
//
// There should be no space between the number and the unit of a length."
//
// "A trailing '%' represents a percent of the default value. The default
// value, or how it is obtained, is listed in the table of attributes for each
// element. [...] A number without a unit is intepreted as a multiple of the
// default value."
//
// "The possible units in MathML are:
//
// Unit Description
// em an em (font-relative unit traditionally used for horizontal lengths)
// ex an ex (font-relative unit traditionally used for vertical lengths)
// px pixels, or size of a pixel in the current display
// in inches (1 inch = 2.54 centimeters)
// cm centimeters
// mm millimeters
// pt points (1 point = 1/72 inch)
// pc picas (1 pica = 12 points)
// % percentage of default value"
//
// The numbers are defined that way:
// - unsigned-number: "a string of decimal digits with up to one decimal point
// (U+002E), representing a non-negative terminating decimal number (a type of
// rational number)"
// - number: "an optional prefix of '-' (U+002D), followed by an unsigned
// number, representing a terminating decimal number (a type of rational
// number)"
//
/* static */
// XXXfredw: Deprecate legacy MathML syntax and use the CSS parser instead.
// See https://github.com/mathml-refresh/mathml/issues/63
bool MathMLElement::ParseNumericValue(const nsString& aString,
nsCSSValue& aCSSValue, uint32_t aFlags,
Document* aDocument) {
nsAutoString str(aString);
str.CompressWhitespace(); // aString is const in this code...
int32_t stringLength = str.Length();
if (!stringLength) {
if (!(aFlags & PARSE_SUPPRESS_WARNINGS)) {
ReportLengthParseError(aString, aDocument);
}
return false;
}
if (aDocument && ParseNamedSpaceValue(str, aCSSValue, aFlags, *aDocument)) {
return true;
}
nsAutoString number, unit;
// see if the negative sign is there
int32_t i = 0;
char16_t c = str[0];
if (c == '-') {
number.Append(c);
i++;
}
// Gather up characters that make up the number
bool gotDot = false;
for (; i < stringLength; i++) {
c = str[i];
if (gotDot && c == '.') {
if (!(aFlags & PARSE_SUPPRESS_WARNINGS)) {
ReportLengthParseError(aString, aDocument);
}
return false; // two dots encountered
} else if (c == '.')
gotDot = true;
else if (!IsAsciiDigit(c)) {
str.Right(unit, stringLength - i);
// some authors leave blanks before the unit, but that shouldn't
// be allowed, so don't CompressWhitespace on 'unit'.
break;
}
number.Append(c);
}
if (gotDot && str[i - 1] == '.') {
if (!(aFlags & PARSE_SUPPRESS_WARNINGS)) {
ReportLengthParseError(aString, aDocument);
}
return false; // Number ending with a dot.
}
// Convert number to floating point
nsresult errorCode;
float floatValue = number.ToFloat(&errorCode);
if (NS_FAILED(errorCode)) {
if (!(aFlags & PARSE_SUPPRESS_WARNINGS)) {
ReportLengthParseError(aString, aDocument);
}
return false;
}
if (floatValue < 0 && !(aFlags & PARSE_ALLOW_NEGATIVE)) {
if (!(aFlags & PARSE_SUPPRESS_WARNINGS)) {
ReportLengthParseError(aString, aDocument);
}
return false;
}
nsCSSUnit cssUnit;
if (unit.IsEmpty()) {
// We are supposed to have a unit, but there isn't one.
// If the value is 0 we can just call it "pixels" otherwise
// this is illegal.
if (floatValue != 0.0) {
if (!(aFlags & PARSE_SUPPRESS_WARNINGS)) {
ReportLengthParseError(aString, aDocument);
}
return false;
}
cssUnit = eCSSUnit_Pixel;
} else if (unit.EqualsLiteral("%")) {
aCSSValue.SetPercentValue(floatValue / 100.0f);
return true;
} else if (unit.LowerCaseEqualsLiteral("em"))
cssUnit = eCSSUnit_EM;
else if (unit.LowerCaseEqualsLiteral("ex"))
cssUnit = eCSSUnit_XHeight;
else if (unit.LowerCaseEqualsLiteral("px"))
cssUnit = eCSSUnit_Pixel;
else if (unit.LowerCaseEqualsLiteral("in"))
cssUnit = eCSSUnit_Inch;
else if (unit.LowerCaseEqualsLiteral("cm"))
cssUnit = eCSSUnit_Centimeter;
else if (unit.LowerCaseEqualsLiteral("mm"))
cssUnit = eCSSUnit_Millimeter;
else if (unit.LowerCaseEqualsLiteral("pt"))
cssUnit = eCSSUnit_Point;
else if (unit.LowerCaseEqualsLiteral("pc"))
cssUnit = eCSSUnit_Pica;
else if (unit.LowerCaseEqualsLiteral("q"))
cssUnit = eCSSUnit_Quarter;
else { // unexpected unit
if (!(aFlags & PARSE_SUPPRESS_WARNINGS)) {
ReportLengthParseError(aString, aDocument);
}
return false;
}
aCSSValue.SetFloatValue(floatValue, cssUnit);
return true;
}
void MathMLElement::MapMTableAttributesInto(
MappedDeclarationsBuilder& aBuilder) {
// width
//
// "Specifies the desired width of the entire table and is intended for
// visual user agents. When the value is a percentage value, the value is
// relative to the horizontal space a MathML renderer has available for the
// math element. When the value is "auto", the MathML renderer should
// calculate the table width from its contents using whatever layout
// algorithm it chooses. "
//
// values: "auto" | length
// default: auto
//
if (!aBuilder.PropertyIsSet(eCSSProperty_width)) {
const nsAttrValue* value = aBuilder.GetAttr(nsGkAtoms::width);
nsCSSValue width;
// This does not handle auto and unitless values
if (value && value->Type() == nsAttrValue::eString) {
ParseNumericValue(value->GetStringValue(), width, 0,
&aBuilder.Document());
if (width.GetUnit() == eCSSUnit_Percent) {
aBuilder.SetPercentValue(eCSSProperty_width, width.GetPercentValue());
} else if (width.GetUnit() != eCSSUnit_Null) {
aBuilder.SetLengthValue(eCSSProperty_width, width);
}
}
}
MapGlobalMathMLAttributesInto(aBuilder);
}
void MathMLElement::MapMiAttributesInto(MappedDeclarationsBuilder& aBuilder) {
// mathvariant
// https://w3c.github.io/mathml-core/#dfn-mathvariant
if (!aBuilder.PropertyIsSet(eCSSProperty_text_transform)) {
const nsAttrValue* value = aBuilder.GetAttr(nsGkAtoms::mathvariant_);
if (value && value->Type() == nsAttrValue::eString) {
auto str = value->GetStringValue();
str.CompressWhitespace();
if (value->GetStringValue().LowerCaseEqualsASCII("normal")) {
aBuilder.SetKeywordValue(eCSSProperty_text_transform,
StyleTextTransformCase::None);
}
}
}
MapGlobalMathMLAttributesInto(aBuilder);
}
void MathMLElement::MapGlobalMathMLAttributesInto(
MappedDeclarationsBuilder& aBuilder) {
// scriptlevel
//
// "Changes the scriptlevel in effect for the children. When the value is
// given without a sign, it sets scriptlevel to the specified value; when a
// sign is given, it increments ("+") or decrements ("-") the current
// value. (Note that large decrements can result in negative values of
// scriptlevel, but these values are considered legal.)"
//
// values: ( "+" | "-" )? unsigned-integer
// default: inherited
//
const nsAttrValue* value = aBuilder.GetAttr(nsGkAtoms::scriptlevel_);
if (value && value->Type() == nsAttrValue::eString &&
!aBuilder.PropertyIsSet(eCSSProperty_math_depth)) {
auto str = value->GetStringValue();
str.CompressWhitespace();
if (str.Length() > 0) {
nsresult errorCode;
int32_t intValue = str.ToInteger(&errorCode);
if (NS_SUCCEEDED(errorCode)) {
char16_t ch = str.CharAt(0);
bool isRelativeScriptLevel = (ch == '+' || ch == '-');
aBuilder.SetMathDepthValue(intValue, isRelativeScriptLevel);
} else {
ReportParseErrorNoTag(str, nsGkAtoms::scriptlevel_,
aBuilder.Document());
}
}
}
// mathsize
// https://w3c.github.io/mathml-core/#dfn-mathsize
value = aBuilder.GetAttr(nsGkAtoms::mathsize_);
if (value && value->Type() == nsAttrValue::eString &&
!aBuilder.PropertyIsSet(eCSSProperty_font_size)) {
auto str = value->GetStringValue();
nsCSSValue fontSize;
ParseNumericValue(str, fontSize, 0, nullptr);
if (fontSize.GetUnit() == eCSSUnit_Percent) {
aBuilder.SetPercentValue(eCSSProperty_font_size,
fontSize.GetPercentValue());
} else if (fontSize.GetUnit() != eCSSUnit_Null) {
aBuilder.SetLengthValue(eCSSProperty_font_size, fontSize);
}
}
if (!StaticPrefs::mathml_legacy_mathvariant_attribute_disabled()) {
// mathvariant
//
// "Specifies the logical class of the token. Note that this class is more
// than styling, it typically conveys semantic intent;"
//
// values: "normal" | "bold" | "italic" | "bold-italic" | "double-struck" |
// "bold-fraktur" | "script" | "bold-script" | "fraktur" | "sans-serif" |
// "bold-sans-serif" | "sans-serif-italic" | "sans-serif-bold-italic" |
// "monospace" | "initial" | "tailed" | "looped" | "stretched"
// default: normal (except on <mi>)
//
value = aBuilder.GetAttr(nsGkAtoms::mathvariant_);
if (value && value->Type() == nsAttrValue::eString &&
!aBuilder.PropertyIsSet(eCSSProperty__moz_math_variant)) {
auto str = value->GetStringValue();
str.CompressWhitespace();
static const char sizes[19][23] = {"normal",
"bold",
"italic",
"bold-italic",
"script",
"bold-script",
"fraktur",
"double-struck",
"bold-fraktur",
"sans-serif",
"bold-sans-serif",
"sans-serif-italic",
"sans-serif-bold-italic",
"monospace",
"initial",
"tailed",
"looped",
"stretched"};
static const StyleMathVariant values[MOZ_ARRAY_LENGTH(sizes)] = {
StyleMathVariant::Normal,
StyleMathVariant::Bold,
StyleMathVariant::Italic,
StyleMathVariant::BoldItalic,
StyleMathVariant::Script,
StyleMathVariant::BoldScript,
StyleMathVariant::Fraktur,
StyleMathVariant::DoubleStruck,
StyleMathVariant::BoldFraktur,
StyleMathVariant::SansSerif,
StyleMathVariant::BoldSansSerif,
StyleMathVariant::SansSerifItalic,
StyleMathVariant::SansSerifBoldItalic,
StyleMathVariant::Monospace,
StyleMathVariant::Initial,
StyleMathVariant::Tailed,
StyleMathVariant::Looped,
StyleMathVariant::Stretched};
for (uint32_t i = 0; i < ArrayLength(sizes); ++i) {
if (str.LowerCaseEqualsASCII(sizes[i])) {
aBuilder.SetKeywordValue(eCSSProperty__moz_math_variant, values[i]);
break;
}
}
}
}
// mathbackground
// https://w3c.github.io/mathml-core/#dfn-mathbackground
value = aBuilder.GetAttr(nsGkAtoms::mathbackground_);
if (value) {
nscolor color;
if (value->GetColorValue(color)) {
aBuilder.SetColorValueIfUnset(eCSSProperty_background_color, color);
}
}
// mathcolor
// https://w3c.github.io/mathml-core/#dfn-mathcolor
value = aBuilder.GetAttr(nsGkAtoms::mathcolor_);
nscolor color;
if (value && value->GetColorValue(color)) {
aBuilder.SetColorValueIfUnset(eCSSProperty_color, color);
}
// dir
// https://w3c.github.io/mathml-core/#dfn-dir
value = aBuilder.GetAttr(nsGkAtoms::dir);
if (value && value->Type() == nsAttrValue::eString &&
!aBuilder.PropertyIsSet(eCSSProperty_direction)) {
auto str = value->GetStringValue();
static const char dirs[][4] = {"ltr", "rtl"};
static const StyleDirection dirValues[MOZ_ARRAY_LENGTH(dirs)] = {
StyleDirection::Ltr, StyleDirection::Rtl};
for (uint32_t i = 0; i < ArrayLength(dirs); ++i) {
if (str.LowerCaseEqualsASCII(dirs[i])) {
aBuilder.SetKeywordValue(eCSSProperty_direction, dirValues[i]);
break;
}
}
}
// displaystyle
// https://mathml-refresh.github.io/mathml-core/#dfn-displaystyle
value = aBuilder.GetAttr(nsGkAtoms::displaystyle_);
if (value && value->Type() == nsAttrValue::eString &&
!aBuilder.PropertyIsSet(eCSSProperty_math_style)) {
auto str = value->GetStringValue();
static const char displaystyles[][6] = {"false", "true"};
static const StyleMathStyle mathStyle[MOZ_ARRAY_LENGTH(displaystyles)] = {
StyleMathStyle::Compact, StyleMathStyle::Normal};
for (uint32_t i = 0; i < ArrayLength(displaystyles); ++i) {
if (str.LowerCaseEqualsASCII(displaystyles[i])) {
aBuilder.SetKeywordValue(eCSSProperty_math_style, mathStyle[i]);
break;
}
}
}
}
void MathMLElement::GetEventTargetParent(EventChainPreVisitor& aVisitor) {
Element::GetEventTargetParent(aVisitor);
GetEventTargetParentForLinks(aVisitor);
}
nsresult MathMLElement::PostHandleEvent(EventChainPostVisitor& aVisitor) {
return PostHandleEventForLinks(aVisitor);
}
NS_IMPL_ELEMENT_CLONE(MathMLElement)
ElementState MathMLElement::IntrinsicState() const {
return Link::LinkState() | MathMLElementBase::IntrinsicState() |
(mIncrementScriptLevel ? ElementState::INCREMENT_SCRIPT_LEVEL
: ElementState());
}
void MathMLElement::SetIncrementScriptLevel(bool aIncrementScriptLevel,
bool aNotify) {
if (aIncrementScriptLevel == mIncrementScriptLevel) return;
mIncrementScriptLevel = aIncrementScriptLevel;
NS_ASSERTION(aNotify, "We always notify!");
UpdateState(true);
}
int32_t MathMLElement::TabIndexDefault() { return IsLink() ? 0 : -1; }
// XXX Bug 1586011: Share logic with other element classes.
bool MathMLElement::IsFocusableInternal(int32_t* aTabIndex, bool aWithMouse) {
if (!IsInComposedDoc() || IsInDesignMode()) {
// In designMode documents we only allow focusing the document.
if (aTabIndex) {
*aTabIndex = -1;
}
return false;
}
int32_t tabIndex = TabIndex();
if (aTabIndex) {
*aTabIndex = tabIndex;
}
if (!IsLink()) {
// If a tabindex is specified at all we're focusable
return GetTabIndexAttrValue().isSome();
}
if (!OwnerDoc()->LinkHandlingEnabled()) {
return false;
}
// Links that are in an editable region should never be focusable, even if
// they are in a contenteditable="false" region.
if (nsContentUtils::IsNodeInEditableRegion(this)) {
if (aTabIndex) {
*aTabIndex = -1;
}
return false;
}
if (aTabIndex && (sTabFocusModel & eTabFocus_linksMask) == 0) {
*aTabIndex = -1;
}
return true;
}
already_AddRefed<nsIURI> MathMLElement::GetHrefURI() const {
// MathML href
// The REC says: "When user agents encounter MathML elements with both href
// and xlink:href attributes, the href attribute should take precedence."
const nsAttrValue* href = mAttrs.GetAttr(nsGkAtoms::href, kNameSpaceID_None);
if (!href) {
return nullptr;
}
// Get absolute URI
nsAutoString hrefStr;
href->ToString(hrefStr);
nsCOMPtr<nsIURI> hrefURI;
nsContentUtils::NewURIWithDocumentCharset(getter_AddRefs(hrefURI), hrefStr,
OwnerDoc(), GetBaseURI());
return hrefURI.forget();
}
bool MathMLElement::IsEventAttributeNameInternal(nsAtom* aName) {
// The intent is to align MathML event attributes on HTML5, so the flag
// EventNameType_HTML is used here.
return nsContentUtils::IsEventAttributeName(aName, EventNameType_HTML);
}
void MathMLElement::BeforeSetAttr(int32_t aNamespaceID, nsAtom* aName,
const nsAttrValue* aValue, bool aNotify) {
if (aNamespaceID == kNameSpaceID_None) {
if (!aValue && IsEventAttributeName(aName)) {
if (EventListenerManager* manager = GetExistingListenerManager()) {
manager->RemoveEventHandler(GetEventNameForAttr(aName));
}
}
}
return MathMLElementBase::BeforeSetAttr(aNamespaceID, aName, aValue, aNotify);
}
void MathMLElement::AfterSetAttr(int32_t aNameSpaceID, nsAtom* aName,
const nsAttrValue* aValue,
const nsAttrValue* aOldValue,
nsIPrincipal* aSubjectPrincipal,
bool aNotify) {
// It is important that this be done after the attribute is set/unset.
// We will need the updated attribute value because notifying the document
// that content states have changed will call IntrinsicState, which will try
// to get updated information about the visitedness from Link.
if (aName == nsGkAtoms::href && aNameSpaceID == kNameSpaceID_None) {
Link::ResetLinkState(aNotify, aValue || Link::ElementHasHref());
}
if (aNameSpaceID == kNameSpaceID_None) {
if (IsEventAttributeName(aName) && aValue) {
MOZ_ASSERT(aValue->Type() == nsAttrValue::eString,
"Expected string value for script body");
SetEventHandler(GetEventNameForAttr(aName), aValue->GetStringValue());
}
}
return MathMLElementBase::AfterSetAttr(aNameSpaceID, aName, aValue, aOldValue,
aSubjectPrincipal, aNotify);
}
JSObject* MathMLElement::WrapNode(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return MathMLElement_Binding::Wrap(aCx, this, aGivenProto);
}
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