static void
GetDevicePixelRatio(nsPresContext* aPresContext, const nsMediaFeature*,
nsCSSValue& aResult)
{
if (!ShouldResistFingerprinting(aPresContext)) {
float ratio = aPresContext->CSSPixelsToDevPixels(1.0f);
aResult.SetFloatValue(ratio, eCSSUnit_Number);
} else {
aResult.SetFloatValue(1.0, eCSSUnit_Number);
}
}
static void
GetDeviceHeight(nsIDocument* aDocument, const nsMediaFeature*,
nsCSSValue& aResult)
{
nsSize size = GetDeviceSize(aDocument);
aResult.SetFloatValue(CSSPixel::FromAppUnits(size.height), eCSSUnit_Pixel);
}
static void
GetWidth(nsIDocument* aDocument, const nsMediaFeature*,
nsCSSValue& aResult)
{
nsSize size = GetSize(aDocument);
aResult.SetFloatValue(CSSPixel::FromAppUnits(size.width), eCSSUnit_Pixel);
}
static void
GetWidth(nsPresContext* aPresContext, const nsMediaFeature*,
nsCSSValue& aResult)
{
nsSize size = GetSize(aPresContext);
float pixelWidth = aPresContext->AppUnitsToFloatCSSPixels(size.width);
aResult.SetFloatValue(pixelWidth, eCSSUnit_Pixel);
}
static void
GetDeviceHeight(nsPresContext* aPresContext, const nsMediaFeature*,
nsCSSValue& aResult)
{
nsSize size = GetDeviceSize(aPresContext);
float pixelHeight = aPresContext->AppUnitsToFloatCSSPixels(size.height);
aResult.SetFloatValue(pixelHeight, eCSSUnit_Pixel);
}
static nsresult
GetDevicePixelRatio(nsPresContext* aPresContext, const nsMediaFeature*,
nsCSSValue& aResult)
{
float ratio = aPresContext->CSSPixelsToDevPixels(1.0f);
aResult.SetFloatValue(ratio, eCSSUnit_Number);
return NS_OK;
}
static nsresult
GetDeviceWidth(nsPresContext* aPresContext, const nsMediaFeature*,
nsCSSValue& aResult)
{
nsSize size = GetDeviceSize(aPresContext);
float pixelWidth = aPresContext->AppUnitsToFloatCSSPixels(size.width);
aResult.SetFloatValue(pixelWidth, eCSSUnit_Pixel);
return NS_OK;
}
static nsresult
GetHeight(nsPresContext* aPresContext, const nsMediaFeature*,
nsCSSValue& aResult)
{
nsSize size = GetSize(aPresContext);
float pixelHeight = aPresContext->AppUnitsToFloatCSSPixels(size.height);
aResult.SetFloatValue(pixelHeight, eCSSUnit_Pixel);
return NS_OK;
}
static nsresult
GetResolution(nsPresContext* aPresContext, const nsMediaFeature*,
nsCSSValue& aResult)
{
// Resolution values are in device pixels, not CSS pixels.
nsDeviceContext *dx = GetDeviceContextFor(aPresContext);
float dpi = float(dx->AppUnitsPerPhysicalInch()) / float(dx->AppUnitsPerDevPixel());
aResult.SetFloatValue(dpi, eCSSUnit_Inch);
return NS_OK;
}
static nsresult
GetResolution(nsPresContext* aPresContext, const nsMediaFeature*,
nsCSSValue& aResult)
{
// Resolution measures device pixels per CSS (inch/cm/pixel). We
// return it in device pixels per CSS inches.
float dpi = float(nsPresContext::AppUnitsPerCSSInch()) /
float(aPresContext->AppUnitsPerDevPixel());
aResult.SetFloatValue(dpi, eCSSUnit_Inch);
return NS_OK;
}
static void
GetResolution(nsPresContext* aPresContext, const nsMediaFeature*,
nsCSSValue& aResult)
{
float dpi = 96; // Use 96 when resisting fingerprinting.
if (!ShouldResistFingerprinting(aPresContext)) {
// Resolution measures device pixels per CSS (inch/cm/pixel). We
// return it in device pixels per CSS inches.
dpi = float(nsPresContext::AppUnitsPerCSSInch()) /
float(aPresContext->AppUnitsPerDevPixel());
}
aResult.SetFloatValue(dpi, eCSSUnit_Inch);
}
static void
GetDevicePixelRatio(nsIDocument* aDocument, const nsMediaFeature*,
nsCSSValue& aResult)
{
if (nsContentUtils::ShouldResistFingerprinting(aDocument)) {
aResult.SetFloatValue(1.0, eCSSUnit_Number);
return;
}
nsIPresShell* presShell = aDocument->GetShell();
if (!presShell) {
aResult.SetFloatValue(1.0, eCSSUnit_Number);
return;
}
nsPresContext* pc = presShell->GetPresContext();
if (!pc) {
aResult.SetFloatValue(1.0, eCSSUnit_Number);
return;
}
float ratio = pc->CSSPixelsToDevPixels(1.0f);
aResult.SetFloatValue(ratio, eCSSUnit_Number);
}
/* 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;
}
static nsresult
GetResolution(nsPresContext* aPresContext, const nsMediaFeature*,
nsCSSValue& aResult)
{
// Resolution measures device pixels per CSS (inch/cm/pixel). We
// return it in device pixels per CSS inches.
//
// However, on platforms where the CSS viewport is not fixed to the
// screen viewport, use the device resolution instead (bug 779527).
nsIPresShell *shell = aPresContext->PresShell();
float appUnitsPerInch = shell->GetIsViewportOverridden() ?
GetDeviceContextFor(aPresContext)->AppUnitsPerPhysicalInch() :
nsPresContext::AppUnitsPerCSSInch();
float dpi = appUnitsPerInch /
float(aPresContext->AppUnitsPerDevPixel());
aResult.SetFloatValue(dpi, eCSSUnit_Inch);
return NS_OK;
}
static void
GetResolution(nsIDocument* aDocument, const nsMediaFeature*,
nsCSSValue& aResult)
{
// We're returning resolution in terms of device pixels per css pixel, since
// that is the preferred unit for media queries of resolution. This avoids
// introducing precision error from conversion to and from less-used
// physical units like inches.
float dppx = 1.;
if (nsDeviceContext* dx = GetDeviceContextFor(aDocument)) {
if (nsContentUtils::ShouldResistFingerprinting(aDocument)) {
dppx = dx->GetFullZoom();
} else {
// Get the actual device pixel ratio, which also takes zoom into account.
dppx =
float(nsPresContext::AppUnitsPerCSSPixel()) / dx->AppUnitsPerDevPixel();
}
}
aResult.SetFloatValue(dppx, eCSSUnit_Pixel);
}
// parse an input string in the following format (see bug 148326 for testcases):
// [+|-] unsigned-number (% [pseudo-unit] | pseudo-unit | css-unit | namedspace)
bool
nsMathMLmpaddedFrame::ParseAttribute(nsString& aString,
int32_t& aSign,
nsCSSValue& aCSSValue,
int32_t& aPseudoUnit)
{
aCSSValue.Reset();
aSign = NS_MATHML_SIGN_INVALID;
aPseudoUnit = NS_MATHML_PSEUDO_UNIT_UNSPECIFIED;
aString.CompressWhitespace(); // aString is not a const in this code
int32_t stringLength = aString.Length();
if (!stringLength)
return false;
nsAutoString number, unit;
//////////////////////
// see if the sign is there
int32_t i = 0;
if (aString[0] == '+') {
aSign = NS_MATHML_SIGN_PLUS;
i++;
}
else if (aString[0] == '-') {
aSign = NS_MATHML_SIGN_MINUS;
i++;
}
else
aSign = NS_MATHML_SIGN_UNSPECIFIED;
// get the number
bool gotDot = false, gotPercent = false;
for (; i < stringLength; i++) {
PRUnichar c = aString[i];
if (gotDot && c == '.') {
// error - two dots encountered
aSign = NS_MATHML_SIGN_INVALID;
return false;
}
if (c == '.')
gotDot = true;
else if (!nsCRT::IsAsciiDigit(c)) {
break;
}
number.Append(c);
}
// catch error if we didn't enter the loop above... we could simply initialize
// floatValue = 1, to cater for cases such as width="height", but that wouldn't
// be in line with the spec which requires an explicit number
if (number.IsEmpty()) {
aSign = NS_MATHML_SIGN_INVALID;
return false;
}
nsresult errorCode;
float floatValue = number.ToFloat(&errorCode);
if (NS_FAILED(errorCode)) {
aSign = NS_MATHML_SIGN_INVALID;
return false;
}
// see if this is a percentage-based value
if (i < stringLength && aString[i] == '%') {
i++;
gotPercent = true;
}
// the remainder now should be a css-unit, or a pseudo-unit, or a named-space
aString.Right(unit, stringLength - i);
if (unit.IsEmpty()) {
if (gotPercent) {
// case ["+"|"-"] unsigned-number "%"
aCSSValue.SetPercentValue(floatValue / 100.0f);
aPseudoUnit = NS_MATHML_PSEUDO_UNIT_ITSELF;
return true;
} else {
// case ["+"|"-"] unsigned-number
// XXXfredw: should we allow non-zero unitless values? See bug 757703.
if (!floatValue) {
aCSSValue.SetFloatValue(floatValue, eCSSUnit_Number);
aPseudoUnit = NS_MATHML_PSEUDO_UNIT_ITSELF;
return true;
}
}
}
else if (unit.EqualsLiteral("width")) aPseudoUnit = NS_MATHML_PSEUDO_UNIT_WIDTH;
else if (unit.EqualsLiteral("height")) aPseudoUnit = NS_MATHML_PSEUDO_UNIT_HEIGHT;
else if (unit.EqualsLiteral("depth")) aPseudoUnit = NS_MATHML_PSEUDO_UNIT_DEPTH;
else if (!gotPercent) { // percentage can only apply to a pseudo-unit
// see if the unit is a named-space
if (nsMathMLElement::ParseNamedSpaceValue(unit, aCSSValue,
nsMathMLElement::
PARSE_ALLOW_NEGATIVE)) {
// re-scale properly, and we know that the unit of the named-space is 'em'
floatValue *= aCSSValue.GetFloatValue();
aCSSValue.SetFloatValue(floatValue, eCSSUnit_EM);
aPseudoUnit = NS_MATHML_PSEUDO_UNIT_NAMEDSPACE;
return true;
}
// see if the input was just a CSS value
// We are not supposed to have a unitless, percent, negative or namedspace
// value here.
number.Append(unit); // leave the sign out if it was there
if (nsMathMLElement::ParseNumericValue(number, aCSSValue,
nsMathMLElement::
PARSE_SUPPRESS_WARNINGS, nullptr))
return true;
}
// if we enter here, we have a number that will act as a multiplier on a pseudo-unit
if (aPseudoUnit != NS_MATHML_PSEUDO_UNIT_UNSPECIFIED) {
if (gotPercent)
aCSSValue.SetPercentValue(floatValue / 100.0f);
else
aCSSValue.SetFloatValue(floatValue, eCSSUnit_Number);
return true;
}
#ifdef DEBUG
printf("mpadded: attribute with bad numeric value: %s\n",
NS_LossyConvertUTF16toASCII(aString).get());
#endif
// if we reach here, it means we encounter an unexpected input
aSign = NS_MATHML_SIGN_INVALID;
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;
PRUnichar 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;
}
// parse an input string in the following format (see bug 148326 for testcases):
// [+|-] unsigned-number (% [pseudo-unit] | pseudo-unit | css-unit | namedspace)
PRBool
nsMathMLmpaddedFrame::ParseAttribute(nsString& aString,
PRInt32& aSign,
nsCSSValue& aCSSValue,
PRInt32& aPseudoUnit)
{
aCSSValue.Reset();
aSign = NS_MATHML_SIGN_INVALID;
aPseudoUnit = NS_MATHML_PSEUDO_UNIT_UNSPECIFIED;
aString.CompressWhitespace(); // aString is not a const in this code
PRInt32 stringLength = aString.Length();
if (!stringLength)
return PR_FALSE;
nsAutoString number, unit;
//////////////////////
// see if the sign is there
PRInt32 i = 0;
if (aString[0] == '+') {
aSign = NS_MATHML_SIGN_PLUS;
i++;
}
else if (aString[0] == '-') {
aSign = NS_MATHML_SIGN_MINUS;
i++;
}
else
aSign = NS_MATHML_SIGN_UNSPECIFIED;
// skip any space after the sign
if (i < stringLength && nsCRT::IsAsciiSpace(aString[i]))
i++;
// get the number
PRBool gotDot = PR_FALSE, gotPercent = PR_FALSE;
for (; i < stringLength; i++) {
PRUnichar c = aString[i];
if (gotDot && c == '.') {
// error - two dots encountered
aSign = NS_MATHML_SIGN_INVALID;
return PR_FALSE;
}
if (c == '.')
gotDot = PR_TRUE;
else if (!nsCRT::IsAsciiDigit(c)) {
break;
}
number.Append(c);
}
// catch error if we didn't enter the loop above... we could simply initialize
// floatValue = 1, to cater for cases such as width="height", but that wouldn't
// be in line with the spec which requires an explicit number
if (number.IsEmpty()) {
#ifdef NS_DEBUG
printf("mpadded: attribute with bad numeric value: %s\n",
NS_LossyConvertUTF16toASCII(aString).get());
#endif
aSign = NS_MATHML_SIGN_INVALID;
return PR_FALSE;
}
PRInt32 errorCode;
float floatValue = number.ToFloat(&errorCode);
if (errorCode) {
aSign = NS_MATHML_SIGN_INVALID;
return PR_FALSE;
}
// skip any space after the number
if (i < stringLength && nsCRT::IsAsciiSpace(aString[i]))
i++;
// see if this is a percentage-based value
if (i < stringLength && aString[i] == '%') {
i++;
gotPercent = PR_TRUE;
// skip any space after the '%' sign
if (i < stringLength && nsCRT::IsAsciiSpace(aString[i]))
i++;
}
// the remainder now should be a css-unit, or a pseudo-unit, or a named-space
aString.Right(unit, stringLength - i);
if (unit.IsEmpty()) {
// also cater for the edge case of "0" for which the unit is optional
if (gotPercent || !floatValue) {
aCSSValue.SetPercentValue(floatValue / 100.0f);
aPseudoUnit = NS_MATHML_PSEUDO_UNIT_ITSELF;
return PR_TRUE;
}
/*
else {
// no explicit CSS unit and no explicit pseudo-unit...
// In this case, the MathML REC suggests taking ems for
// h-unit (width, lspace) or exs for v-unit (height, depth).
// Here, however, we explicitly request authors to specify
// the unit. This is more in line with the CSS REC (and
// it allows keeping the code simpler...)
}
*/
}
else if (unit.EqualsLiteral("width")) aPseudoUnit = NS_MATHML_PSEUDO_UNIT_WIDTH;
else if (unit.EqualsLiteral("height")) aPseudoUnit = NS_MATHML_PSEUDO_UNIT_HEIGHT;
else if (unit.EqualsLiteral("depth")) aPseudoUnit = NS_MATHML_PSEUDO_UNIT_DEPTH;
else if (unit.EqualsLiteral("lspace")) aPseudoUnit = NS_MATHML_PSEUDO_UNIT_LSPACE;
else if (!gotPercent) { // percentage can only apply to a pseudo-unit
// see if the unit is a named-space
// XXX nsnull in ParseNamedSpacedValue()? don't access mstyle?
if (ParseNamedSpaceValue(nsnull, unit, aCSSValue)) {
// re-scale properly, and we know that the unit of the named-space is 'em'
floatValue *= aCSSValue.GetFloatValue();
aCSSValue.SetFloatValue(floatValue, eCSSUnit_EM);
aPseudoUnit = NS_MATHML_PSEUDO_UNIT_NAMEDSPACE;
return PR_TRUE;
}
// see if the input was just a CSS value
number.Append(unit); // leave the sign out if it was there
if (ParseNumericValue(number, aCSSValue))
return PR_TRUE;
}
// if we enter here, we have a number that will act as a multiplier on a pseudo-unit
if (aPseudoUnit != NS_MATHML_PSEUDO_UNIT_UNSPECIFIED) {
if (gotPercent)
aCSSValue.SetPercentValue(floatValue / 100.0f);
else
aCSSValue.SetFloatValue(floatValue, eCSSUnit_Number);
return PR_TRUE;
}
#ifdef NS_DEBUG
printf("mpadded: attribute with bad numeric value: %s\n",
NS_LossyConvertUTF16toASCII(aString).get());
#endif
// if we reach here, it means we encounter an unexpected input
aSign = NS_MATHML_SIGN_INVALID;
return PR_FALSE;
}
/* static */ PRBool
nsMathMLFrame::ParseNamedSpaceValue(nsIFrame* aMathMLmstyleFrame,
nsString& aString,
nsCSSValue& aCSSValue)
{
aCSSValue.Reset();
aString.CompressWhitespace(); // aString is not a const in this code...
if (!aString.Length()) return PR_FALSE;
// See if it is one of the 'namedspace' (ranging 1/18em...7/18em)
PRInt32 i = 0;
nsIAtom* namedspaceAtom = nsnull;
if (aString.EqualsLiteral("veryverythinmathspace")) {
i = 1;
namedspaceAtom = nsMathMLAtoms::veryverythinmathspace_;
}
else if (aString.EqualsLiteral("verythinmathspace")) {
i = 2;
namedspaceAtom = nsMathMLAtoms::verythinmathspace_;
}
else if (aString.EqualsLiteral("thinmathspace")) {
i = 3;
namedspaceAtom = nsMathMLAtoms::thinmathspace_;
}
else if (aString.EqualsLiteral("mediummathspace")) {
i = 4;
namedspaceAtom = nsMathMLAtoms::mediummathspace_;
}
else if (aString.EqualsLiteral("thickmathspace")) {
i = 5;
namedspaceAtom = nsMathMLAtoms::thickmathspace_;
}
else if (aString.EqualsLiteral("verythickmathspace")) {
i = 6;
namedspaceAtom = nsMathMLAtoms::verythickmathspace_;
}
else if (aString.EqualsLiteral("veryverythickmathspace")) {
i = 7;
namedspaceAtom = nsMathMLAtoms::veryverythickmathspace_;
}
if (0 != i) {
if (aMathMLmstyleFrame) {
// see if there is a <mstyle> that has overriden the default value
// GetAttribute() will recurse all the way up into the <mstyle> hierarchy
nsAutoString value;
if (NS_CONTENT_ATTR_HAS_VALUE ==
GetAttribute(nsnull, aMathMLmstyleFrame, namedspaceAtom, value)) {
if (ParseNumericValue(value, aCSSValue) &&
aCSSValue.IsLengthUnit()) {
return PR_TRUE;
}
}
}
// fall back to the default value
aCSSValue.SetFloatValue(float(i)/float(18), eCSSUnit_EM);
return PR_TRUE;
}
return PR_FALSE;
}
/* static */ PRBool
nsMathMLElement::ParseNumericValue(const nsString& aString,
nsCSSValue& aCSSValue,
PRUint32 aFlags)
{
nsAutoString str(aString);
str.CompressWhitespace(); // aString is const in this code...
PRInt32 stringLength = str.Length();
if (!stringLength)
return PR_FALSE;
nsAutoString number, unit;
// see if the negative sign is there
PRInt32 i = 0;
PRUnichar c = str[0];
if (c == '-') {
number.Append(c);
i++;
// skip any space after the negative sign
if (i < stringLength && nsCRT::IsAsciiSpace(str[i]))
i++;
}
// Gather up characters that make up the number
PRBool gotDot = PR_FALSE;
for ( ; i < stringLength; i++) {
c = str[i];
if (gotDot && c == '.')
return PR_FALSE; // two dots encountered
else if (c == '.')
gotDot = PR_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
PRInt32 errorCode;
float floatValue = number.ToFloat(&errorCode);
if (NS_FAILED(errorCode))
return PR_FALSE;
if (floatValue < 0 && !(aFlags & PARSE_ALLOW_NEGATIVE))
return PR_FALSE;
nsCSSUnit cssUnit;
if (unit.IsEmpty()) {
if (aFlags & PARSE_ALLOW_UNITLESS) {
// no explicit unit, this is a number that will act as a multiplier
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)
return PR_FALSE;
cssUnit = eCSSUnit_Pixel;
}
}
else if (unit.EqualsLiteral("%")) {
aCSSValue.SetPercentValue(floatValue / 100.0f);
return PR_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
return PR_FALSE;
aCSSValue.SetFloatValue(floatValue, cssUnit);
return PR_TRUE;
}
/* static */ PRBool
nsMathMLFrame::ParseNumericValue(nsString& aString,
nsCSSValue& aCSSValue)
{
aCSSValue.Reset();
aString.CompressWhitespace(); // aString is not a const in this code...
PRInt32 stringLength = aString.Length();
if (!stringLength)
return PR_FALSE;
nsAutoString number, unit;
// Gather up characters that make up the number
PRBool gotDot = PR_FALSE;
PRUnichar c;
for (PRInt32 i = 0; i < stringLength; i++) {
c = aString[i];
if (gotDot && c == '.')
return PR_FALSE; // two dots encountered
else if (c == '.')
gotDot = PR_TRUE;
else if (!nsCRT::IsAsciiDigit(c)) {
aString.Right(unit, stringLength - i);
unit.CompressWhitespace(); // some authors leave blanks before the unit
break;
}
number.Append(c);
}
// on exit, also return a nicer string version of the value in case
// the caller wants it (e.g., this removes whitespace before units)
aString.Assign(number);
aString.Append(unit);
// Convert number to floating point
PRInt32 errorCode;
float floatValue = number.ToFloat(&errorCode);
if (errorCode)
return PR_FALSE;
nsCSSUnit cssUnit;
if (unit.IsEmpty()) {
cssUnit = eCSSUnit_Number; // no explicit unit, this is a number that will act as a multiplier
}
else if (unit.EqualsLiteral("%")) {
aCSSValue.SetPercentValue(floatValue / 100.0f);
return PR_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
return PR_FALSE;
aCSSValue.SetFloatValue(floatValue, cssUnit);
return PR_TRUE;
}