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gecko/dom/mathml/nsMathMLElement.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/ArrayUtils.h"
#include "nsGkAtoms.h"
#include "nsCRT.h"
#include "nsLayoutStylesheetCache.h"
#include "nsRuleData.h"
#include "nsCSSValue.h"
#include "nsCSSParser.h"
#include "nsMappedAttributes.h"
#include "nsStyleConsts.h"
#include "nsIDocument.h"
#include "nsIPresShell.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/dom/ElementBinding.h"
using namespace mozilla;
using namespace mozilla::dom;
//----------------------------------------------------------------------
// nsISupports methods:
NS_IMPL_ISUPPORTS_INHERITED(nsMathMLElement, nsMathMLElementBase,
nsIDOMElement, nsIDOMNode, Link)
static nsresult
WarnDeprecated(const char16_t* aDeprecatedAttribute,
const char16_t* aFavoredAttribute, nsIDocument* aDocument)
{
const char16_t *argv[] =
{ aDeprecatedAttribute, aFavoredAttribute };
return nsContentUtils::
ReportToConsole(nsIScriptError::warningFlag,
NS_LITERAL_CSTRING("MathML"), aDocument,
nsContentUtils::eMATHML_PROPERTIES,
"DeprecatedSupersededBy", argv, 2);
}
static nsresult
ReportLengthParseError(const nsString& aValue, nsIDocument* aDocument)
{
const char16_t *arg = aValue.get();
return nsContentUtils::
ReportToConsole(nsIScriptError::errorFlag,
NS_LITERAL_CSTRING("MathML"), aDocument,
nsContentUtils::eMATHML_PROPERTIES,
"LengthParsingError", &arg, 1);
}
static nsresult
ReportParseErrorNoTag(const nsString& aValue,
nsIAtom* aAtom,
nsIDocument* aDocument)
{
const char16_t *argv[] =
{ aValue.get(), aAtom->GetUTF16String() };
return nsContentUtils::
ReportToConsole(nsIScriptError::errorFlag,
NS_LITERAL_CSTRING("MathML"), aDocument,
nsContentUtils::eMATHML_PROPERTIES,
"AttributeParsingErrorNoTag", argv, 2);
}
nsMathMLElement::nsMathMLElement(already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo)
: nsMathMLElementBase(aNodeInfo),
ALLOW_THIS_IN_INITIALIZER_LIST(Link(this)),
mIncrementScriptLevel(false)
{
}
nsMathMLElement::nsMathMLElement(already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo)
: nsMathMLElementBase(aNodeInfo),
ALLOW_THIS_IN_INITIALIZER_LIST(Link(this)),
mIncrementScriptLevel(false)
{
}
nsresult
nsMathMLElement::BindToTree(nsIDocument* aDocument, nsIContent* aParent,
nsIContent* aBindingParent,
bool aCompileEventHandlers)
{
Link::ResetLinkState(false, Link::ElementHasHref());
nsresult rv = nsMathMLElementBase::BindToTree(aDocument, aParent,
aBindingParent,
aCompileEventHandlers);
NS_ENSURE_SUCCESS(rv, rv);
if (aDocument) {
aDocument->RegisterPendingLinkUpdate(this);
}
nsIDocument* doc = GetComposedDoc();
if (doc) {
if (!doc->GetMathMLEnabled()) {
// Enable MathML and setup the style sheet during binding, not element
// construction, because we could move a MathML element from the document
// that created it to another document.
doc->SetMathMLEnabled();
doc->
EnsureOnDemandBuiltInUASheet(nsLayoutStylesheetCache::MathMLSheet());
// Rebuild style data for the presshell, because style system
// optimizations may have taken place assuming MathML was disabled.
// (See nsRuleNode::CheckSpecifiedProperties.)
nsCOMPtr<nsIPresShell> shell = doc->GetShell();
if (shell) {
shell->GetPresContext()->PostRebuildAllStyleDataEvent(nsChangeHint(0));
}
}
}
return rv;
}
void
nsMathMLElement::UnbindFromTree(bool aDeep, bool aNullParent)
{
// If this link is ever reinserted into a document, it might
// be under a different xml:base, so forget the cached state now.
Link::ResetLinkState(false, Link::ElementHasHref());
nsIDocument* doc = GetCurrentDoc();
if (doc) {
doc->UnregisterPendingLinkUpdate(this);
}
nsMathMLElementBase::UnbindFromTree(aDeep, aNullParent);
}
bool
nsMathMLElement::ParseAttribute(int32_t aNamespaceID,
nsIAtom* aAttribute,
const nsAString& aValue,
nsAttrValue& aResult)
{
if (aNamespaceID == kNameSpaceID_None) {
if (Tag() == nsGkAtoms::math && aAttribute == nsGkAtoms::mode) {
WarnDeprecated(nsGkAtoms::mode->GetUTF16String(),
nsGkAtoms::display->GetUTF16String(), OwnerDoc());
}
if (aAttribute == nsGkAtoms::color) {
WarnDeprecated(nsGkAtoms::color->GetUTF16String(),
nsGkAtoms::mathcolor_->GetUTF16String(), OwnerDoc());
}
if (aAttribute == nsGkAtoms::color ||
aAttribute == nsGkAtoms::mathcolor_ ||
aAttribute == nsGkAtoms::background ||
aAttribute == nsGkAtoms::mathbackground_) {
return aResult.ParseColor(aValue);
}
}
return nsMathMLElementBase::ParseAttribute(aNamespaceID, aAttribute,
aValue, aResult);
}
static Element::MappedAttributeEntry sMtableStyles[] = {
{ &nsGkAtoms::width },
{ nullptr }
};
static Element::MappedAttributeEntry sTokenStyles[] = {
{ &nsGkAtoms::mathsize_ },
{ &nsGkAtoms::fontsize_ },
{ &nsGkAtoms::color },
{ &nsGkAtoms::fontfamily_ },
{ &nsGkAtoms::fontstyle_ },
{ &nsGkAtoms::fontweight_ },
{ &nsGkAtoms::mathvariant_},
{ nullptr }
};
static Element::MappedAttributeEntry sEnvironmentStyles[] = {
{ &nsGkAtoms::scriptlevel_ },
{ &nsGkAtoms::scriptminsize_ },
{ &nsGkAtoms::scriptsizemultiplier_ },
{ &nsGkAtoms::background },
{ nullptr }
};
static Element::MappedAttributeEntry sCommonPresStyles[] = {
{ &nsGkAtoms::mathcolor_ },
{ &nsGkAtoms::mathbackground_ },
{ nullptr }
};
static Element::MappedAttributeEntry sDirStyles[] = {
{ &nsGkAtoms::dir },
{ nullptr }
};
bool
nsMathMLElement::IsAttributeMapped(const nsIAtom* aAttribute) const
{
static const MappedAttributeEntry* const mtableMap[] = {
sMtableStyles,
sCommonPresStyles
};
static const MappedAttributeEntry* const tokenMap[] = {
sTokenStyles,
sCommonPresStyles,
sDirStyles
};
static const MappedAttributeEntry* const mstyleMap[] = {
sTokenStyles,
sEnvironmentStyles,
sCommonPresStyles,
sDirStyles
};
static const MappedAttributeEntry* const commonPresMap[] = {
sCommonPresStyles
};
static const MappedAttributeEntry* const mrowMap[] = {
sCommonPresStyles,
sDirStyles
};
// We don't support mglyph (yet).
nsIAtom* tag = Tag();
if (tag == nsGkAtoms::ms_ || tag == nsGkAtoms::mi_ ||
tag == nsGkAtoms::mn_ || tag == nsGkAtoms::mo_ ||
tag == nsGkAtoms::mtext_ || tag == nsGkAtoms::mspace_)
return FindAttributeDependence(aAttribute, tokenMap);
if (tag == nsGkAtoms::mstyle_ ||
tag == nsGkAtoms::math)
return FindAttributeDependence(aAttribute, mstyleMap);
if (tag == nsGkAtoms::mtable_)
return FindAttributeDependence(aAttribute, mtableMap);
if (tag == nsGkAtoms::mrow_)
return FindAttributeDependence(aAttribute, mrowMap);
if (tag == nsGkAtoms::maction_ ||
tag == nsGkAtoms::maligngroup_ ||
tag == nsGkAtoms::malignmark_ ||
tag == nsGkAtoms::menclose_ ||
tag == nsGkAtoms::merror_ ||
tag == nsGkAtoms::mfenced_ ||
tag == nsGkAtoms::mfrac_ ||
tag == nsGkAtoms::mover_ ||
tag == nsGkAtoms::mpadded_ ||
tag == nsGkAtoms::mphantom_ ||
tag == nsGkAtoms::mprescripts_ ||
tag == nsGkAtoms::mroot_ ||
tag == nsGkAtoms::msqrt_ ||
tag == nsGkAtoms::msub_ ||
tag == nsGkAtoms::msubsup_ ||
tag == nsGkAtoms::msup_ ||
tag == nsGkAtoms::mtd_ ||
tag == nsGkAtoms::mtr_ ||
tag == nsGkAtoms::munder_ ||
tag == nsGkAtoms::munderover_ ||
tag == nsGkAtoms::none) {
return FindAttributeDependence(aAttribute, commonPresMap);
}
return false;
}
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)
{
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) {
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 */ bool
nsMathMLElement::ParseNumericValue(const nsString& aString,
nsCSSValue& aCSSValue,
uint32_t aFlags,
nsIDocument* 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 (ParseNamedSpaceValue(aString, aCSSValue, aFlags)) {
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 (!nsCRT::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);
}
// 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 (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.EqualsLiteral("em")) cssUnit = eCSSUnit_EM;
else if (unit.EqualsLiteral("ex")) cssUnit = eCSSUnit_XHeight;
else if (unit.EqualsLiteral("px")) cssUnit = eCSSUnit_Pixel;
else if (unit.EqualsLiteral("in")) cssUnit = eCSSUnit_Inch;
else if (unit.EqualsLiteral("cm")) cssUnit = eCSSUnit_Centimeter;
else if (unit.EqualsLiteral("mm")) cssUnit = eCSSUnit_Millimeter;
else if (unit.EqualsLiteral("pt")) cssUnit = eCSSUnit_Point;
else if (unit.EqualsLiteral("pc")) cssUnit = eCSSUnit_Pica;
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,
nsRuleData* aData)
{
if (aData->mSIDs & NS_STYLE_INHERIT_BIT(Font)) {
// 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_);
nsCSSValue* scriptSizeMultiplier =
aData->ValueForScriptSizeMultiplier();
if (value && value->Type() == nsAttrValue::eString &&
scriptSizeMultiplier->GetUnit() == eCSSUnit_Null) {
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) {
scriptSizeMultiplier->SetFloatValue(floatValue, eCSSUnit_Number);
} else {
ReportParseErrorNoTag(str,
nsGkAtoms::scriptsizemultiplier_,
aData->mPresContext->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_);
nsCSSValue* scriptMinSize = aData->ValueForScriptMinSize();
if (value && value->Type() == nsAttrValue::eString &&
scriptMinSize->GetUnit() == eCSSUnit_Null) {
ParseNumericValue(value->GetStringValue(), *scriptMinSize,
PARSE_ALLOW_UNITLESS | CONVERT_UNITLESS_TO_PERCENT,
aData->mPresContext->Document());
if (scriptMinSize->GetUnit() == eCSSUnit_Percent) {
scriptMinSize->SetFloatValue(8.0 * scriptMinSize->GetPercentValue(),
eCSSUnit_Point);
}
}
// 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_);
nsCSSValue* scriptLevel = aData->ValueForScriptLevel();
if (value && value->Type() == nsAttrValue::eString &&
scriptLevel->GetUnit() == eCSSUnit_Null) {
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 == '-') {
scriptLevel->SetIntValue(intValue, eCSSUnit_Integer);
} else {
scriptLevel->SetFloatValue(intValue, eCSSUnit_Number);
}
} else {
ReportParseErrorNoTag(str,
nsGkAtoms::scriptlevel_,
aData->mPresContext->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 = true;
value = aAttributes->GetAttr(nsGkAtoms::mathsize_);
if (!value) {
parseSizeKeywords = false;
value = aAttributes->GetAttr(nsGkAtoms::fontsize_);
if (value) {
WarnDeprecated(nsGkAtoms::fontsize_->GetUTF16String(),
nsGkAtoms::mathsize_->GetUTF16String(),
aData->mPresContext->Document());
}
}
nsCSSValue* fontSize = aData->ValueForFontSize();
if (value && value->Type() == nsAttrValue::eString &&
fontSize->GetUnit() == eCSSUnit_Null) {
nsAutoString str(value->GetStringValue());
if (!ParseNumericValue(str, *fontSize, PARSE_SUPPRESS_WARNINGS |
PARSE_ALLOW_UNITLESS | CONVERT_UNITLESS_TO_PERCENT,
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])) {
fontSize->SetIntValue(values[i], eCSSUnit_Enumerated);
break;
}
}
}
}
// 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_);
nsCSSValue* fontFamily = aData->ValueForFontFamily();
if (value) {
WarnDeprecated(nsGkAtoms::fontfamily_->GetUTF16String(),
nsGkAtoms::mathvariant_->GetUTF16String(),
aData->mPresContext->Document());
}
if (value && value->Type() == nsAttrValue::eString &&
fontFamily->GetUnit() == eCSSUnit_Null) {
nsCSSParser parser;
parser.ParseFontFamilyListString(value->GetStringValue(),
nullptr, 0, *fontFamily);
}
// 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.
nsCSSValue* fontStyle = aData->ValueForFontStyle();
value = aAttributes->GetAttr(nsGkAtoms::fontstyle_);
if (value) {
WarnDeprecated(nsGkAtoms::fontstyle_->GetUTF16String(),
nsGkAtoms::mathvariant_->GetUTF16String(),
aData->mPresContext->Document());
if (value->Type() == nsAttrValue::eString &&
fontStyle->GetUnit() == eCSSUnit_Null) {
nsAutoString str(value->GetStringValue());
str.CompressWhitespace();
if (str.EqualsASCII("normal")) {
fontStyle->SetIntValue(NS_STYLE_FONT_STYLE_NORMAL,
eCSSUnit_Enumerated);
} else if (str.EqualsASCII("italic")) {
fontStyle->SetIntValue(NS_STYLE_FONT_STYLE_ITALIC,
eCSSUnit_Enumerated);
}
}
}
// 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.
nsCSSValue* fontWeight = aData->ValueForFontWeight();
value = aAttributes->GetAttr(nsGkAtoms::fontweight_);
if (value) {
WarnDeprecated(nsGkAtoms::fontweight_->GetUTF16String(),
nsGkAtoms::mathvariant_->GetUTF16String(),
aData->mPresContext->Document());
if (value->Type() == nsAttrValue::eString &&
fontWeight->GetUnit() == eCSSUnit_Null) {
nsAutoString str(value->GetStringValue());
str.CompressWhitespace();
if (str.EqualsASCII("normal")) {
fontWeight->SetIntValue(NS_STYLE_FONT_WEIGHT_NORMAL,
eCSSUnit_Enumerated);
} else if (str.EqualsASCII("bold")) {
fontWeight->SetIntValue(NS_STYLE_FONT_WEIGHT_BOLD,
eCSSUnit_Enumerated);
}
}
}
// 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>)
//
nsCSSValue* mathVariant = aData->ValueForMathVariant();
value = aAttributes->GetAttr(nsGkAtoms::mathvariant_);
if (value && value->Type() == nsAttrValue::eString &&
mathVariant->GetUnit() == eCSSUnit_Null) {
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.EqualsASCII(sizes[i])) {
mathVariant->SetIntValue(values[i], eCSSUnit_Enumerated);
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"
//
if (aData->mSIDs & NS_STYLE_INHERIT_BIT(Background)) {
const nsAttrValue* value =
aAttributes->GetAttr(nsGkAtoms::mathbackground_);
if (!value) {
value = aAttributes->GetAttr(nsGkAtoms::background);
if (value) {
WarnDeprecated(nsGkAtoms::background->GetUTF16String(),
nsGkAtoms::mathbackground_->GetUTF16String(),
aData->mPresContext->Document());
}
}
nsCSSValue* backgroundColor = aData->ValueForBackgroundColor();
if (value && backgroundColor->GetUnit() == eCSSUnit_Null) {
nscolor color;
if (value->GetColorValue(color)) {
backgroundColor->SetColorValue(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
//
if (aData->mSIDs & NS_STYLE_INHERIT_BIT(Color)) {
const nsAttrValue* value = aAttributes->GetAttr(nsGkAtoms::mathcolor_);
if (!value) {
value = aAttributes->GetAttr(nsGkAtoms::color);
if (value) {
WarnDeprecated(nsGkAtoms::color->GetUTF16String(),
nsGkAtoms::mathcolor_->GetUTF16String(),
aData->mPresContext->Document());
}
}
nscolor color;
nsCSSValue* colorValue = aData->ValueForColor();
if (value && value->GetColorValue(color) &&
colorValue->GetUnit() == eCSSUnit_Null) {
colorValue->SetColorValue(color);
}
}
if (aData->mSIDs & NS_STYLE_INHERIT_BIT(Position)) {
// 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
//
nsCSSValue* width = aData->ValueForWidth();
if (width->GetUnit() == eCSSUnit_Null) {
const nsAttrValue* value = aAttributes->GetAttr(nsGkAtoms::width);
// This does not handle auto and unitless values
if (value && value->Type() == nsAttrValue::eString) {
ParseNumericValue(value->GetStringValue(), *width, 0,
aData->mPresContext->Document());
}
}
}
// 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
//
if (aData->mSIDs & NS_STYLE_INHERIT_BIT(Visibility)) {
const nsAttrValue* value = aAttributes->GetAttr(nsGkAtoms::dir);
nsCSSValue* direction = aData->ValueForDirection();
if (value && value->Type() == nsAttrValue::eString &&
direction->GetUnit() == eCSSUnit_Null) {
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.EqualsASCII(dirs[i])) {
direction->SetIntValue(dirValues[i], eCSSUnit_Enumerated);
break;
}
}
}
}
}
nsresult
nsMathMLElement::PreHandleEvent(EventChainPreVisitor& aVisitor)
{
nsresult rv = Element::PreHandleEvent(aVisitor);
NS_ENSURE_SUCCESS(rv, rv);
return PreHandleEventForLinks(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 !(aFlags & ~eCONTENT);
}
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
{
// http://www.w3.org/TR/2010/REC-MathML3-20101021/chapter6.html#interf.link
// The REC says that the following elements should not be linking elements:
nsIAtom* tag = Tag();
if (tag == nsGkAtoms::mprescripts_ ||
tag == nsGkAtoms::none ||
tag == nsGkAtoms::malignmark_ ||
tag == nsGkAtoms::maligngroup_) {
*aURI = nullptr;
return false;
}
bool hasHref = false;
const nsAttrValue* href = mAttrsAndChildren.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 nsIContent::AttrValuesArray sTypeVals[] =
{ &nsGkAtoms::_empty, &nsGkAtoms::simple, nullptr };
static nsIContent::AttrValuesArray sShowVals[] =
{ &nsGkAtoms::_empty, &nsGkAtoms::_new, &nsGkAtoms::replace, nullptr };
static nsIContent::AttrValuesArray sActuateVals[] =
{ &nsGkAtoms::_empty, &nsGkAtoms::onRequest, nullptr };
// Optimization: check for href first for early return
href = mAttrsAndChildren.GetAttr(nsGkAtoms::href,
kNameSpaceID_XLink);
if (href &&
FindAttrValueIn(kNameSpaceID_XLink, nsGkAtoms::type,
sTypeVals, eCaseMatters) !=
nsIContent::ATTR_VALUE_NO_MATCH &&
FindAttrValueIn(kNameSpaceID_XLink, nsGkAtoms::show,
sShowVals, eCaseMatters) !=
nsIContent::ATTR_VALUE_NO_MATCH &&
FindAttrValueIn(kNameSpaceID_XLink, nsGkAtoms::actuate,
sActuateVals, eCaseMatters) !=
nsIContent::ATTR_VALUE_NO_MATCH) {
hasHref = true;
}
}
if (hasHref) {
nsCOMPtr<nsIURI> baseURI = GetBaseURI();
// Get absolute URI
nsAutoString hrefStr;
href->ToString(hrefStr);
nsContentUtils::NewURIWithDocumentCharset(aURI, hrefStr,
OwnerDoc(), baseURI);
// 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 = mAttrsAndChildren.GetAttr(nsGkAtoms::target,
kNameSpaceID_XLink);
if (target) {
target->ToString(aTarget);
}
if (aTarget.IsEmpty()) {
static nsIContent::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::SetAttr(int32_t aNameSpaceID, nsIAtom* aName,
nsIAtom* aPrefix, const nsAString& aValue,
bool aNotify)
{
nsresult rv = nsMathMLElementBase::SetAttr(aNameSpaceID, aName, aPrefix,
aValue, aNotify);
// The ordering of the parent class's SetAttr call and Link::ResetLinkState
// is important here! The attribute is not set until SetAttr returns, and
// 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 (aNameSpaceID == kNameSpaceID_XLink) {
WarnDeprecated(MOZ_UTF16("xlink:href"),
MOZ_UTF16("href"), OwnerDoc());
}
Link::ResetLinkState(!!aNotify, true);
}
return rv;
}
nsresult
nsMathMLElement::UnsetAttr(int32_t aNameSpaceID, nsIAtom* aAttr,
bool aNotify)
{
nsresult rv = nsMathMLElementBase::UnsetAttr(aNameSpaceID, aAttr, aNotify);
// The ordering of the parent class's UnsetAttr call and Link::ResetLinkState
// is important here! The attribute is not unset until UnsetAttr returns, and
// 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 (aAttr == nsGkAtoms::href &&
(aNameSpaceID == kNameSpaceID_None ||
aNameSpaceID == kNameSpaceID_XLink)) {
// Note: just because we removed a single href attr doesn't mean there's no href,
// since there are 2 possible namespaces.
Link::ResetLinkState(!!aNotify, Link::ElementHasHref());
}
return rv;
}
JSObject*
nsMathMLElement::WrapNode(JSContext *aCx)
{
return ElementBinding::Wrap(aCx, this);
}
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