gecko-dev/dom/mathml/nsMathMLElement.cpp

975 lines
35 KiB
C++

/* -*- 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 "nsMathMLElement.h"
#include "base/compiler_specific.h"
#include "mozilla/dom/BindContext.h"
#include "mozilla/ArrayUtils.h"
#include "mozilla/FontPropertyTypes.h"
#include "mozilla/StaticPrefs_mathml.h"
#include "mozilla/TextUtils.h"
#include "nsGkAtoms.h"
#include "nsITableCellLayout.h" // for MAX_COLSPAN / MAX_ROWSPAN
#include "nsLayoutStylesheetCache.h"
#include "nsCSSValue.h"
#include "nsMappedAttributes.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/EventStates.h"
#include "mozilla/MappedDeclarations.h"
#include "mozilla/dom/ElementBinding.h"
using namespace mozilla;
using namespace mozilla::dom;
//----------------------------------------------------------------------
// nsISupports methods:
NS_IMPL_ISUPPORTS_INHERITED(nsMathMLElement, nsMathMLElementBase, Link)
static nsresult WarnDeprecated(const char16_t* aDeprecatedAttribute,
const char16_t* aFavoredAttribute,
Document* aDocument) {
AutoTArray<nsString, 2> argv;
argv.AppendElement(aDeprecatedAttribute);
argv.AppendElement(aFavoredAttribute);
return nsContentUtils::ReportToConsole(
nsIScriptError::warningFlag, NS_LITERAL_CSTRING("MathML"), aDocument,
nsContentUtils::eMATHML_PROPERTIES, "DeprecatedSupersededBy", argv);
}
static nsresult ReportLengthParseError(const nsString& aValue,
Document* aDocument) {
AutoTArray<nsString, 1> arg = {aValue};
return nsContentUtils::ReportToConsole(
nsIScriptError::errorFlag, NS_LITERAL_CSTRING("MathML"), 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, NS_LITERAL_CSTRING("MathML"), aDocument,
nsContentUtils::eMATHML_PROPERTIES, "AttributeParsingErrorNoTag", argv);
}
nsMathMLElement::nsMathMLElement(
already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo)
: nsMathMLElementBase(std::move(aNodeInfo)),
ALLOW_THIS_IN_INITIALIZER_LIST(Link(this)),
mIncrementScriptLevel(false) {}
nsMathMLElement::nsMathMLElement(
already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo)
: nsMathMLElementBase(std::move(aNodeInfo)),
ALLOW_THIS_IN_INITIALIZER_LIST(Link(this)),
mIncrementScriptLevel(false) {}
nsresult nsMathMLElement::BindToTree(BindContext& aContext, nsINode& aParent) {
Link::ResetLinkState(false, Link::ElementHasHref());
nsresult rv = nsMathMLElementBase::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 nsMathMLElement::UnbindFromTree(bool aNullParent) {
// Without removing the link state we risk a dangling pointer
// in the mStyledLinks hashtable
Link::ResetLinkState(false, Link::ElementHasHref());
nsMathMLElementBase::UnbindFromTree(aNullParent);
}
bool nsMathMLElement::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 (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 nsMathMLElementBase::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::mathvariant_},
{nsGkAtoms::scriptlevel_},
// XXXfredw: Also map displaystyle to CSS math-style?
{nullptr}};
// XXXfredw(bug 1548471): Add a runtime flag to disable these attributes.
static Element::MappedAttributeEntry sDeprecatedScriptAttributes[] = {
{nsGkAtoms::scriptminsize_}, {nsGkAtoms::scriptsizemultiplier_}, {nullptr}};
static Element::MappedAttributeEntry sDeprecatedStyleAttributes[] = {
{nsGkAtoms::background},
{nsGkAtoms::color},
{nsGkAtoms::fontfamily_},
{nsGkAtoms::fontsize_},
{nsGkAtoms::fontstyle_},
{nsGkAtoms::fontweight_},
{nullptr}};
bool nsMathMLElement::IsAttributeMapped(const nsAtom* aAttribute) const {
MOZ_ASSERT(IsMathMLElement());
static const MappedAttributeEntry* const globalMap[] = {
sGlobalAttributes, sDeprecatedScriptAttributes};
static const MappedAttributeEntry* const styleMap[] = {
sDeprecatedStyleAttributes};
return FindAttributeDependence(aAttribute, globalMap) ||
(!StaticPrefs::mathml_deprecated_style_attributes_disabled() &&
FindAttributeDependence(aAttribute, styleMap)) ||
(mNodeInfo->Equals(nsGkAtoms::mtable_) &&
aAttribute == nsGkAtoms::width);
}
nsMapRuleToAttributesFunc nsMathMLElement::GetAttributeMappingFunction() const {
// It doesn't really matter what our tag is here, because only attributes
// that satisfy IsAttributeMapped will be stored in the mapped attributes
// list and available to the mapping function
return &MapMathMLAttributesInto;
}
/* static */
bool nsMathMLElement::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::Document::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 nsMathMLElement::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 (StaticPrefs::mathml_legacy_number_syntax_disabled() &&
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()) {
if (!StaticPrefs::mathml_nonzero_unitless_lengths_disabled() &&
(aFlags & PARSE_ALLOW_UNITLESS)) {
// no explicit unit, this is a number that will act as a multiplier
if (!(aFlags & PARSE_SUPPRESS_WARNINGS)) {
nsContentUtils::ReportToConsole(nsIScriptError::warningFlag,
NS_LITERAL_CSTRING("MathML"), aDocument,
nsContentUtils::eMATHML_PROPERTIES,
"UnitlessValuesAreDeprecated");
}
if (aFlags & CONVERT_UNITLESS_TO_PERCENT) {
aCSSValue.SetPercentValue(floatValue);
return true;
} else
cssUnit = eCSSUnit_Number;
} else {
// 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 nsMathMLElement::MapMathMLAttributesInto(
const nsMappedAttributes* aAttributes, MappedDeclarations& aDecls) {
// scriptsizemultiplier
//
// "Specifies the multiplier to be used to adjust font size due to changes
// in scriptlevel.
//
// values: number
// default: 0.71
//
const nsAttrValue* value =
aAttributes->GetAttr(nsGkAtoms::scriptsizemultiplier_);
if (value && value->Type() == nsAttrValue::eString &&
!aDecls.PropertyIsSet(eCSSProperty__moz_script_size_multiplier)) {
nsAutoString str(value->GetStringValue());
str.CompressWhitespace();
// MathML numbers can't have leading '+'
if (str.Length() > 0 && str.CharAt(0) != '+') {
nsresult errorCode;
float floatValue = str.ToFloat(&errorCode);
// Negative scriptsizemultipliers are not parsed
if (NS_SUCCEEDED(errorCode) && floatValue >= 0.0f) {
aDecls.SetNumberValue(eCSSProperty__moz_script_size_multiplier,
floatValue);
} else {
ReportParseErrorNoTag(str, nsGkAtoms::scriptsizemultiplier_,
aDecls.Document());
}
}
}
// scriptminsize
//
// "Specifies the minimum font size allowed due to changes in scriptlevel.
// Note that this does not limit the font size due to changes to mathsize."
//
// values: length
// default: 8pt
//
// We don't allow negative values.
// Unitless and percent values give a multiple of the default value.
//
value = aAttributes->GetAttr(nsGkAtoms::scriptminsize_);
if (value && value->Type() == nsAttrValue::eString &&
!aDecls.PropertyIsSet(eCSSProperty__moz_script_min_size)) {
nsCSSValue scriptMinSize;
ParseNumericValue(value->GetStringValue(), scriptMinSize,
PARSE_ALLOW_UNITLESS | CONVERT_UNITLESS_TO_PERCENT,
aDecls.Document());
if (scriptMinSize.GetUnit() == eCSSUnit_Percent) {
scriptMinSize.SetFloatValue(8.0 * scriptMinSize.GetPercentValue(),
eCSSUnit_Point);
}
if (scriptMinSize.GetUnit() != eCSSUnit_Null) {
aDecls.SetLengthValue(eCSSProperty__moz_script_min_size, scriptMinSize);
}
}
// 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
//
value = aAttributes->GetAttr(nsGkAtoms::scriptlevel_);
if (value && value->Type() == nsAttrValue::eString &&
!aDecls.PropertyIsSet(eCSSProperty__moz_script_level)) {
nsAutoString str(value->GetStringValue());
str.CompressWhitespace();
if (str.Length() > 0) {
nsresult errorCode;
int32_t intValue = str.ToInteger(&errorCode);
if (NS_SUCCEEDED(errorCode)) {
// This is kind of cheesy ... if the scriptlevel has a sign,
// then it's a relative value and we store the nsCSSValue as an
// Integer to indicate that. Otherwise we store it as a Number
// to indicate that the scriptlevel is absolute.
char16_t ch = str.CharAt(0);
if (ch == '+' || ch == '-') {
aDecls.SetIntValue(eCSSProperty__moz_script_level, intValue);
} else {
aDecls.SetNumberValue(eCSSProperty__moz_script_level, intValue);
}
} else {
ReportParseErrorNoTag(str, nsGkAtoms::scriptlevel_, aDecls.Document());
}
}
}
// mathsize
//
// "Specifies the size to display the token content. The values 'small' and
// 'big' choose a size smaller or larger than the current font size, but
// leave the exact proportions unspecified; 'normal' is allowed for
// completeness, but since it is equivalent to '100%' or '1em', it has no
// effect."
//
// values: "small" | "normal" | "big" | length
// default: inherited
//
// fontsize
//
// "Specified the size for the token. Deprecated in favor of mathsize."
//
// values: length
// default: inherited
//
// In both cases, we don't allow negative values.
// Unitless values give a multiple of the default value.
//
bool parseSizeKeywords = !StaticPrefs::mathml_mathsize_names_disabled();
value = aAttributes->GetAttr(nsGkAtoms::mathsize_);
if (!value) {
parseSizeKeywords = false;
value = aAttributes->GetAttr(nsGkAtoms::fontsize_);
if (value) {
aDecls.Document()->WarnOnceAbout(
dom::Document::eMathML_DeprecatedStyleAttribute);
}
}
if (value && value->Type() == nsAttrValue::eString &&
!aDecls.PropertyIsSet(eCSSProperty_font_size)) {
nsAutoString str(value->GetStringValue());
nsCSSValue fontSize;
uint32_t flags = PARSE_ALLOW_UNITLESS | CONVERT_UNITLESS_TO_PERCENT;
if (parseSizeKeywords) {
// Do not warn for invalid value if mathsize keywords are accepted.
flags |= PARSE_SUPPRESS_WARNINGS;
}
if (!ParseNumericValue(str, fontSize, flags, nullptr) &&
parseSizeKeywords) {
static const char sizes[3][7] = {"small", "normal", "big"};
static const int32_t values[MOZ_ARRAY_LENGTH(sizes)] = {
NS_STYLE_FONT_SIZE_SMALL, NS_STYLE_FONT_SIZE_MEDIUM,
NS_STYLE_FONT_SIZE_LARGE};
str.CompressWhitespace();
for (uint32_t i = 0; i < ArrayLength(sizes); ++i) {
if (str.EqualsASCII(sizes[i])) {
aDecls.Document()->WarnOnceAbout(
dom::Document::eMathML_DeprecatedMathSizeValue);
aDecls.SetKeywordValue(eCSSProperty_font_size, values[i]);
break;
}
}
} else if (fontSize.GetUnit() == eCSSUnit_Percent) {
aDecls.SetPercentValue(eCSSProperty_font_size,
fontSize.GetPercentValue());
} else if (fontSize.GetUnit() != eCSSUnit_Null) {
aDecls.SetLengthValue(eCSSProperty_font_size, fontSize);
}
}
// fontfamily
//
// "Should be the name of a font that may be available to a MathML renderer,
// or a CSS font specification; See Section 6.5 Using CSS with MathML and
// CSS for more information. Deprecated in favor of mathvariant."
//
// values: string
//
value = aAttributes->GetAttr(nsGkAtoms::fontfamily_);
if (value) {
aDecls.Document()->WarnOnceAbout(
dom::Document::eMathML_DeprecatedStyleAttribute);
}
if (value && value->Type() == nsAttrValue::eString &&
!aDecls.PropertyIsSet(eCSSProperty_font_family)) {
aDecls.SetFontFamily(value->GetStringValue());
}
// fontstyle
//
// "Specified the font style to use for the token. Deprecated in favor of
// mathvariant."
//
// values: "normal" | "italic"
// default: normal (except on <mi>)
//
// Note that the font-style property is reset in layout/style/ when
// -moz-math-variant is specified.
value = aAttributes->GetAttr(nsGkAtoms::fontstyle_);
if (value) {
aDecls.Document()->WarnOnceAbout(
dom::Document::eMathML_DeprecatedStyleAttribute);
if (value->Type() == nsAttrValue::eString &&
!aDecls.PropertyIsSet(eCSSProperty_font_style)) {
nsAutoString str(value->GetStringValue());
str.CompressWhitespace();
// FIXME(emilio): This should use FontSlantStyle or what not. Or even
// better, it looks deprecated since forever, we should just kill it.
if (str.EqualsASCII("normal")) {
aDecls.SetKeywordValue(eCSSProperty_font_style, NS_FONT_STYLE_NORMAL);
} else if (str.EqualsASCII("italic")) {
aDecls.SetKeywordValue(eCSSProperty_font_style, NS_FONT_STYLE_ITALIC);
}
}
}
// fontweight
//
// "Specified the font weight for the token. Deprecated in favor of
// mathvariant."
//
// values: "normal" | "bold"
// default: normal
//
// Note that the font-weight property is reset in layout/style/ when
// -moz-math-variant is specified.
value = aAttributes->GetAttr(nsGkAtoms::fontweight_);
if (value) {
aDecls.Document()->WarnOnceAbout(
dom::Document::eMathML_DeprecatedStyleAttribute);
if (value->Type() == nsAttrValue::eString &&
!aDecls.PropertyIsSet(eCSSProperty_font_weight)) {
nsAutoString str(value->GetStringValue());
str.CompressWhitespace();
if (str.EqualsASCII("normal")) {
aDecls.SetKeywordValue(eCSSProperty_font_weight,
FontWeight::Normal().ToFloat());
} else if (str.EqualsASCII("bold")) {
aDecls.SetKeywordValue(eCSSProperty_font_weight,
FontWeight::Bold().ToFloat());
}
}
}
// 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 = aAttributes->GetAttr(nsGkAtoms::mathvariant_);
if (value && value->Type() == nsAttrValue::eString &&
!aDecls.PropertyIsSet(eCSSProperty__moz_math_variant)) {
nsAutoString 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 int32_t values[MOZ_ARRAY_LENGTH(sizes)] = {
NS_MATHML_MATHVARIANT_NORMAL,
NS_MATHML_MATHVARIANT_BOLD,
NS_MATHML_MATHVARIANT_ITALIC,
NS_MATHML_MATHVARIANT_BOLD_ITALIC,
NS_MATHML_MATHVARIANT_SCRIPT,
NS_MATHML_MATHVARIANT_BOLD_SCRIPT,
NS_MATHML_MATHVARIANT_FRAKTUR,
NS_MATHML_MATHVARIANT_DOUBLE_STRUCK,
NS_MATHML_MATHVARIANT_BOLD_FRAKTUR,
NS_MATHML_MATHVARIANT_SANS_SERIF,
NS_MATHML_MATHVARIANT_BOLD_SANS_SERIF,
NS_MATHML_MATHVARIANT_SANS_SERIF_ITALIC,
NS_MATHML_MATHVARIANT_SANS_SERIF_BOLD_ITALIC,
NS_MATHML_MATHVARIANT_MONOSPACE,
NS_MATHML_MATHVARIANT_INITIAL,
NS_MATHML_MATHVARIANT_TAILED,
NS_MATHML_MATHVARIANT_LOOPED,
NS_MATHML_MATHVARIANT_STRETCHED};
for (uint32_t i = 0; i < ArrayLength(sizes); ++i) {
if (str.LowerCaseEqualsASCII(sizes[i])) {
aDecls.SetKeywordValue(eCSSProperty__moz_math_variant, values[i]);
break;
}
}
}
// mathbackground
//
// "Specifies the background color to be used to fill in the bounding box of
// the element and its children. The default, 'transparent', lets the
// background color, if any, used in the current rendering context to show
// through."
//
// values: color | "transparent"
// default: "transparent"
//
// background
//
// "Specified the background color to be used to fill in the bounding box of
// the element and its children. Deprecated in favor of mathbackground."
//
// values: color | "transparent"
// default: "transparent"
//
value = aAttributes->GetAttr(nsGkAtoms::mathbackground_);
if (!value) {
value = aAttributes->GetAttr(nsGkAtoms::background);
if (value) {
aDecls.Document()->WarnOnceAbout(
dom::Document::eMathML_DeprecatedStyleAttribute);
}
}
if (value) {
nscolor color;
if (value->GetColorValue(color)) {
aDecls.SetColorValueIfUnset(eCSSProperty_background_color, color);
}
}
// mathcolor
//
// "Specifies the foreground color to use when drawing the components of this
// element, such as the content for token elements or any lines, surds, or
// other decorations. It also establishes the default mathcolor used for
// child elements when used on a layout element."
//
// values: color
// default: inherited
//
// color
//
// "Specified the color for the token. Deprecated in favor of mathcolor."
//
// values: color
// default: inherited
//
value = aAttributes->GetAttr(nsGkAtoms::mathcolor_);
if (!value) {
value = aAttributes->GetAttr(nsGkAtoms::color);
if (value) {
aDecls.Document()->WarnOnceAbout(
dom::Document::eMathML_DeprecatedStyleAttribute);
}
}
nscolor color;
if (value && value->GetColorValue(color)) {
aDecls.SetColorValueIfUnset(eCSSProperty_color, color);
}
// 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 (!aDecls.PropertyIsSet(eCSSProperty_width)) {
const nsAttrValue* value = aAttributes->GetAttr(nsGkAtoms::width);
nsCSSValue width;
// This does not handle auto and unitless values
if (value && value->Type() == nsAttrValue::eString) {
ParseNumericValue(value->GetStringValue(), width, 0, aDecls.Document());
if (width.GetUnit() == eCSSUnit_Percent) {
aDecls.SetPercentValue(eCSSProperty_width, width.GetPercentValue());
} else if (width.GetUnit() != eCSSUnit_Null) {
aDecls.SetLengthValue(eCSSProperty_width, width);
}
}
}
// dir
//
// Overall Directionality of Mathematics Formulas:
// "The overall directionality for a formula, basically the direction of the
// Layout Schemata, is specified by the dir attribute on the containing math
// element (see Section 2.2 The Top-Level math Element). The default is ltr.
// [...] The overall directionality is usually set on the math, but may also
// be switched for individual subformula by using the dir attribute on mrow
// or mstyle elements."
//
// Bidirectional Layout in Token Elements:
// "Specifies the initial directionality for text within the token:
// ltr (Left To Right) or rtl (Right To Left). This attribute should only be
// needed in rare cases involving weak or neutral characters;
// see Section 3.1.5.1 Overall Directionality of Mathematics Formulas for
// further discussion. It has no effect on mspace."
//
// values: "ltr" | "rtl"
// default: inherited
//
value = aAttributes->GetAttr(nsGkAtoms::dir);
if (value && value->Type() == nsAttrValue::eString &&
!aDecls.PropertyIsSet(eCSSProperty_direction)) {
nsAutoString str(value->GetStringValue());
static const char dirs[][4] = {"ltr", "rtl"};
static const int32_t dirValues[MOZ_ARRAY_LENGTH(dirs)] = {
NS_STYLE_DIRECTION_LTR, NS_STYLE_DIRECTION_RTL};
for (uint32_t i = 0; i < ArrayLength(dirs); ++i) {
if (str.LowerCaseEqualsASCII(dirs[i])) {
aDecls.SetKeywordValue(eCSSProperty_direction, dirValues[i]);
break;
}
}
}
}
void nsMathMLElement::GetEventTargetParent(EventChainPreVisitor& aVisitor) {
Element::GetEventTargetParent(aVisitor);
GetEventTargetParentForLinks(aVisitor);
}
nsresult nsMathMLElement::PostHandleEvent(EventChainPostVisitor& aVisitor) {
return PostHandleEventForLinks(aVisitor);
}
NS_IMPL_ELEMENT_CLONE(nsMathMLElement)
EventStates nsMathMLElement::IntrinsicState() const {
return Link::LinkState() | nsMathMLElementBase::IntrinsicState() |
(mIncrementScriptLevel ? NS_EVENT_STATE_INCREMENT_SCRIPT_LEVEL
: EventStates());
}
bool nsMathMLElement::IsNodeOfType(uint32_t aFlags) const { return false; }
void nsMathMLElement::SetIncrementScriptLevel(bool aIncrementScriptLevel,
bool aNotify) {
if (aIncrementScriptLevel == mIncrementScriptLevel) return;
mIncrementScriptLevel = aIncrementScriptLevel;
NS_ASSERTION(aNotify, "We always notify!");
UpdateState(true);
}
bool nsMathMLElement::IsFocusableInternal(int32_t* aTabIndex, bool aWithMouse) {
nsCOMPtr<nsIURI> uri;
if (IsLink(getter_AddRefs(uri))) {
if (aTabIndex) {
*aTabIndex = ((sTabFocusModel & eTabFocus_linksMask) == 0 ? -1 : 0);
}
return true;
}
if (aTabIndex) {
*aTabIndex = -1;
}
return false;
}
bool nsMathMLElement::IsLink(nsIURI** aURI) const {
bool hasHref = false;
const nsAttrValue* href = mAttrs.GetAttr(nsGkAtoms::href, kNameSpaceID_None);
if (href) {
// MathML href
// The REC says: "When user agents encounter MathML elements with both href
// and xlink:href attributes, the href attribute should take precedence."
hasHref = true;
} else {
// To be a clickable XLink for styling and interaction purposes, we require:
//
// xlink:href - must be set
// xlink:type - must be unset or set to "" or set to "simple"
// xlink:show - must be unset or set to "", "new" or "replace"
// xlink:actuate - must be unset or set to "" or "onRequest"
//
// For any other values, we're either not a *clickable* XLink, or the end
// result is poorly specified. Either way, we return false.
static Element::AttrValuesArray sTypeVals[] = {nsGkAtoms::_empty,
nsGkAtoms::simple, nullptr};
static Element::AttrValuesArray sShowVals[] = {
nsGkAtoms::_empty, nsGkAtoms::_new, nsGkAtoms::replace, nullptr};
static Element::AttrValuesArray sActuateVals[] = {
nsGkAtoms::_empty, nsGkAtoms::onRequest, nullptr};
// Optimization: check for href first for early return
href = mAttrs.GetAttr(nsGkAtoms::href, kNameSpaceID_XLink);
if (href &&
FindAttrValueIn(kNameSpaceID_XLink, nsGkAtoms::type, sTypeVals,
eCaseMatters) != Element::ATTR_VALUE_NO_MATCH &&
FindAttrValueIn(kNameSpaceID_XLink, nsGkAtoms::show, sShowVals,
eCaseMatters) != Element::ATTR_VALUE_NO_MATCH &&
FindAttrValueIn(kNameSpaceID_XLink, nsGkAtoms::actuate, sActuateVals,
eCaseMatters) != Element::ATTR_VALUE_NO_MATCH) {
hasHref = true;
}
}
if (hasHref) {
// Get absolute URI
nsAutoString hrefStr;
href->ToString(hrefStr);
nsContentUtils::NewURIWithDocumentCharset(aURI, hrefStr, OwnerDoc(),
GetBaseURI());
// must promise out param is non-null if we return true
return !!*aURI;
}
*aURI = nullptr;
return false;
}
void nsMathMLElement::GetLinkTarget(nsAString& aTarget) {
const nsAttrValue* target =
mAttrs.GetAttr(nsGkAtoms::target, kNameSpaceID_XLink);
if (target) {
target->ToString(aTarget);
}
if (aTarget.IsEmpty()) {
static Element::AttrValuesArray sShowVals[] = {nsGkAtoms::_new,
nsGkAtoms::replace, nullptr};
switch (FindAttrValueIn(kNameSpaceID_XLink, nsGkAtoms::show, sShowVals,
eCaseMatters)) {
case 0:
aTarget.AssignLiteral("_blank");
return;
case 1:
return;
}
OwnerDoc()->GetBaseTarget(aTarget);
}
}
already_AddRefed<nsIURI> nsMathMLElement::GetHrefURI() const {
nsCOMPtr<nsIURI> hrefURI;
return IsLink(getter_AddRefs(hrefURI)) ? hrefURI.forget() : nullptr;
}
nsresult nsMathMLElement::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 ||
aNameSpaceID == kNameSpaceID_XLink)) {
if (aValue && aNameSpaceID == kNameSpaceID_XLink) {
WarnDeprecated(u"xlink:href", u"href", OwnerDoc());
}
// Note: When unsetting href, there may still be another href since there
// are 2 possible namespaces.
Link::ResetLinkState(aNotify, aValue || Link::ElementHasHref());
}
return nsMathMLElementBase::AfterSetAttr(
aNameSpaceID, aName, aValue, aOldValue, aSubjectPrincipal, aNotify);
}
JSObject* nsMathMLElement::WrapNode(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return Element_Binding::Wrap(aCx, this, aGivenProto);
}