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Issue #1826 - Add typed calc() arithmetic for media queries

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This commit is contained in:
Basilisk-Dev 2026-05-06 07:58:56 -04:00 • committed by EAZYBLACK
commit 79800a9113
4 changed files with 134 additions and 17 deletions
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117
layout/style/nsCSSParser.cpp
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@ -262,6 +262,65 @@ RoundFloatToCSSInteger(float aValue)
return int32_t(rounded);
}
static bool
GetCalcLengthTypedArithmeticExponent(const nsCSSValue& aValue,
int32_t& aExponent)
{
switch (aValue.GetUnit()) {
case eCSSUnit_Calc: {
nsCSSValue::Array* array = aValue.GetArrayValue();
MOZ_ASSERT(array->Count() == 1, "unexpected length");
return GetCalcLengthTypedArithmeticExponent(array->Item(0), aExponent);
}
case eCSSUnit_Calc_Plus:
case eCSSUnit_Calc_Minus: {
nsCSSValue::Array* array = aValue.GetArrayValue();
MOZ_ASSERT(array->Count() == 2, "unexpected length");
int32_t lhsExponent;
int32_t rhsExponent;
if (!GetCalcLengthTypedArithmeticExponent(array->Item(0), lhsExponent) ||
!GetCalcLengthTypedArithmeticExponent(array->Item(1), rhsExponent) ||
lhsExponent != rhsExponent) {
return false;
}
aExponent = lhsExponent;
return true;
}
case eCSSUnit_Calc_Times_L:
case eCSSUnit_Calc_Times_R:
case eCSSUnit_Calc_Divided: {
nsCSSValue::Array* array = aValue.GetArrayValue();
MOZ_ASSERT(array->Count() == 2, "unexpected length");
int32_t lhsExponent;
int32_t rhsExponent;
if (!GetCalcLengthTypedArithmeticExponent(array->Item(0), lhsExponent) ||
!GetCalcLengthTypedArithmeticExponent(array->Item(1), rhsExponent)) {
return false;
}
aExponent = aValue.GetUnit() == eCSSUnit_Calc_Divided
? lhsExponent - rhsExponent
: lhsExponent + rhsExponent;
return true;
}
case eCSSUnit_Number:
aExponent = 0;
return true;
default:
break;
}
if (aValue.IsLengthUnit()) {
aExponent = 1;
return true;
}
return false;
}
static bool
NormalizeCalcForVariant(nsCSSValue& aValue,
uint32_t aPropertyVariantMask,
@ -1727,6 +1786,7 @@ protected:
// not be set to false if any nsCSSValues created during parsing can escape
// out of the parser.
bool mSheetPrincipalRequired;
bool mCalcAllowsTypedArithmetic;
// This enum helps us track whether we've unprefixed "display: -webkit-box"
// (treating it as "display: flex") in an earlier declaration within a series
@ -1831,6 +1891,7 @@ CSSParserImpl::CSSParserImpl()
mInFailingSupportsRule(false),
mSuppressErrors(false),
mSheetPrincipalRequired(true),
mCalcAllowsTypedArithmetic(false),
mWebkitBoxUnprefixState(eNotParsingDecls),
mNextFree(nullptr)
{
@ -3998,8 +4059,12 @@ CSSParserImpl::ParseMediaQueryExpression(nsMediaQuery* aQuery)
bool rv = false;
switch (feature->mValueType) {
case nsMediaFeature::eLength:
rv = ParseSingleTokenNonNegativeVariant(expr->mValue, VARIANT_LCALC,
nullptr);
{
AutoRestore<bool> autoRestore(mCalcAllowsTypedArithmetic);
mCalcAllowsTypedArithmetic = true;
rv = ParseSingleTokenNonNegativeVariant(expr->mValue, VARIANT_LCALC,
nullptr);
}
break;
case nsMediaFeature::eInteger:
case nsMediaFeature::eBoolInteger:
@ -14848,6 +14913,25 @@ CSSParserImpl::ParseCalc(nsCSSValue& aValue, uint32_t aVariantMask,
if (!ParseCalcAdditiveExpression(arr->Item(0), resultVariantMask))
break;
if (mCalcAllowsTypedArithmetic) {
int32_t exponent;
if (!GetCalcLengthTypedArithmeticExponent(arr->Item(0), exponent)) {
break;
}
if (aVariantMask & VARIANT_NUMBER) {
if (exponent == 0) {
resultVariantMask = VARIANT_NUMBER;
} else if (exponent == 1) {
resultVariantMask &= ~int32_t(VARIANT_NUMBER);
} else {
break;
}
} else if (exponent != 1) {
break;
}
}
if (!ExpectSymbol(')', true))
break;
@ -14928,13 +15012,16 @@ CSSParserImpl::ParseCalcMultiplicativeExpression(nsCSSValue& aValue,
bool *aHadFinalWS)
{
MOZ_ASSERT(aVariantMask != 0, "unexpected variant mask");
bool allowTypedArithmetic = mCalcAllowsTypedArithmetic;
bool gotValue = false; // already got the part with the unit
bool afterDivision = false;
nsCSSValue *storage = &aValue;
for (;;) {
uint32_t variantMask;
if (afterDivision || gotValue) {
if (allowTypedArithmetic) {
variantMask = aVariantMask | VARIANT_NUMBER;
} else if (afterDivision || gotValue) {
variantMask = VARIANT_NUMBER;
} else {
variantMask = aVariantMask | VARIANT_NUMBER;
@ -14955,7 +15042,7 @@ CSSParserImpl::ParseCalcMultiplicativeExpression(nsCSSValue& aValue,
if (number == 0.0 && afterDivision)
return false;
storage->SetFloatValue(number, eCSSUnit_Number);
} else {
} else if (!allowTypedArithmetic) {
gotValue = true;
if (storage != &aValue) {
@ -14977,7 +15064,10 @@ CSSParserImpl::ParseCalcMultiplicativeExpression(nsCSSValue& aValue,
}
nsCSSUnit unit;
if (mToken.IsSymbol('*')) {
unit = gotValue ? eCSSUnit_Calc_Times_R : eCSSUnit_Calc_Times_L;
unit = allowTypedArithmetic
? eCSSUnit_Calc_Times_R
: (gotValue ? eCSSUnit_Calc_Times_R
: eCSSUnit_Calc_Times_L);
afterDivision = false;
} else if (mToken.IsSymbol('/')) {
unit = eCSSUnit_Calc_Divided;
@ -14996,6 +15086,23 @@ CSSParserImpl::ParseCalcMultiplicativeExpression(nsCSSValue& aValue,
// Adjust aVariantMask (see comments above function) to reflect which
// option we took.
if (allowTypedArithmetic) {
int32_t exponent;
if (!GetCalcLengthTypedArithmeticExponent(aValue, exponent)) {
return false;
}
if (aVariantMask & VARIANT_NUMBER) {
if (exponent == 0) {
aVariantMask = VARIANT_NUMBER;
} else {
aVariantMask &= ~int32_t(VARIANT_NUMBER);
}
}
return true;
}
if (aVariantMask & VARIANT_NUMBER) {
if (gotValue) {
aVariantMask &= ~int32_t(VARIANT_NUMBER);