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webkit / WebKit / ba185f33ea04d42647d419285be42e2f7c244fee / . / Source / WebCore / css / CSSCalculationValue.cpp
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/*
* Copyright (C) 2011, 2012 Google Inc. All rights reserved.
* Copyright (C) 2014, 2019 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "CSSCalculationValue.h"
#include "CSSParser.h"
#include "CSSParserTokenRange.h"
#include "CSSPrimitiveValueMappings.h"
#include "Logging.h"
#include "StyleResolver.h"
#include <wtf/MathExtras.h>
#include <wtf/text/StringBuilder.h>
#include <wtf/text/TextStream.h>
static const int maxExpressionDepth = 100;
namespace WebCore {
class CSSCalcPrimitiveValueNode;
class CSSCalcOperationNode;
class CSSCalcNegateNode;
class CSSCalcInvertNode;
}
SPECIALIZE_TYPE_TRAITS_CSSCALCEXPRESSION_NODE(CSSCalcPrimitiveValueNode, type() == WebCore::CSSCalcExpressionNode::Type::CssCalcPrimitiveValue)
SPECIALIZE_TYPE_TRAITS_CSSCALCEXPRESSION_NODE(CSSCalcOperationNode, type() == WebCore::CSSCalcExpressionNode::Type::CssCalcOperation)
SPECIALIZE_TYPE_TRAITS_CSSCALCEXPRESSION_NODE(CSSCalcNegateNode, type() == WebCore::CSSCalcExpressionNode::Type::CssCalcNegate)
SPECIALIZE_TYPE_TRAITS_CSSCALCEXPRESSION_NODE(CSSCalcInvertNode, type() == WebCore::CSSCalcExpressionNode::Type::CssCalcInvert)
namespace WebCore {
static RefPtr<CSSCalcExpressionNode> createCSS(const CalcExpressionNode&, const RenderStyle&);
static RefPtr<CSSCalcExpressionNode> createCSS(const Length&, const RenderStyle&);
static TextStream& operator<<(TextStream& ts, const CSSCalcExpressionNode& node)
{
node.dump(ts);
return ts;
}
static CalculationCategory calcUnitCategory(CSSUnitType type)
{
switch (type) {
case CSSUnitType::CSS_NUMBER:
return CalculationCategory::Number;
case CSSUnitType::CSS_EMS:
case CSSUnitType::CSS_EXS:
case CSSUnitType::CSS_PX:
case CSSUnitType::CSS_CM:
case CSSUnitType::CSS_MM:
case CSSUnitType::CSS_IN:
case CSSUnitType::CSS_PT:
case CSSUnitType::CSS_PC:
case CSSUnitType::CSS_Q:
case CSSUnitType::CSS_REMS:
case CSSUnitType::CSS_CHS:
case CSSUnitType::CSS_VW:
case CSSUnitType::CSS_VH:
case CSSUnitType::CSS_VMIN:
case CSSUnitType::CSS_VMAX:
return CalculationCategory::Length;
case CSSUnitType::CSS_PERCENTAGE:
return CalculationCategory::Percent;
case CSSUnitType::CSS_DEG:
case CSSUnitType::CSS_RAD:
case CSSUnitType::CSS_GRAD:
case CSSUnitType::CSS_TURN:
return CalculationCategory::Angle;
case CSSUnitType::CSS_MS:
case CSSUnitType::CSS_S:
return CalculationCategory::Time;
case CSSUnitType::CSS_HZ:
case CSSUnitType::CSS_KHZ:
return CalculationCategory::Frequency;
default:
return CalculationCategory::Other;
}
}
static CalculationCategory calculationCategoryForCombination(CSSUnitType type)
{
switch (type) {
case CSSUnitType::CSS_NUMBER:
return CalculationCategory::Number;
case CSSUnitType::CSS_PX:
case CSSUnitType::CSS_CM:
case CSSUnitType::CSS_MM:
case CSSUnitType::CSS_IN:
case CSSUnitType::CSS_PT:
case CSSUnitType::CSS_PC:
case CSSUnitType::CSS_Q:
return CalculationCategory::Length;
case CSSUnitType::CSS_PERCENTAGE:
return CalculationCategory::Percent;
case CSSUnitType::CSS_DEG:
case CSSUnitType::CSS_RAD:
case CSSUnitType::CSS_GRAD:
case CSSUnitType::CSS_TURN:
return CalculationCategory::Angle;
case CSSUnitType::CSS_MS:
case CSSUnitType::CSS_S:
return CalculationCategory::Time;
case CSSUnitType::CSS_HZ:
case CSSUnitType::CSS_KHZ:
return CalculationCategory::Frequency;
case CSSUnitType::CSS_EMS:
case CSSUnitType::CSS_EXS:
case CSSUnitType::CSS_REMS:
case CSSUnitType::CSS_CHS:
case CSSUnitType::CSS_VW:
case CSSUnitType::CSS_VH:
case CSSUnitType::CSS_VMIN:
case CSSUnitType::CSS_VMAX:
default:
return CalculationCategory::Other;
}
}
static CSSUnitType canonicalUnitTypeForCalculationCategory(CalculationCategory category)
{
switch (category) {
case CalculationCategory::Number: return CSSUnitType::CSS_NUMBER;
case CalculationCategory::Length: return CSSUnitType::CSS_PX;
case CalculationCategory::Percent: return CSSUnitType::CSS_PERCENTAGE;
case CalculationCategory::Angle: return CSSUnitType::CSS_DEG;
case CalculationCategory::Time: return CSSUnitType::CSS_MS;
case CalculationCategory::Frequency: return CSSUnitType::CSS_HZ;
case CalculationCategory::Other:
case CalculationCategory::PercentNumber:
case CalculationCategory::PercentLength:
ASSERT_NOT_REACHED();
break;
}
return CSSUnitType::CSS_UNKNOWN;
}
static bool hasDoubleValue(CSSUnitType type)
{
switch (type) {
case CSSUnitType::CSS_NUMBER:
case CSSUnitType::CSS_PERCENTAGE:
case CSSUnitType::CSS_EMS:
case CSSUnitType::CSS_EXS:
case CSSUnitType::CSS_CHS:
case CSSUnitType::CSS_REMS:
case CSSUnitType::CSS_PX:
case CSSUnitType::CSS_CM:
case CSSUnitType::CSS_MM:
case CSSUnitType::CSS_IN:
case CSSUnitType::CSS_PT:
case CSSUnitType::CSS_PC:
case CSSUnitType::CSS_DEG:
case CSSUnitType::CSS_RAD:
case CSSUnitType::CSS_GRAD:
case CSSUnitType::CSS_TURN:
case CSSUnitType::CSS_MS:
case CSSUnitType::CSS_S:
case CSSUnitType::CSS_HZ:
case CSSUnitType::CSS_KHZ:
case CSSUnitType::CSS_DIMENSION:
case CSSUnitType::CSS_VW:
case CSSUnitType::CSS_VH:
case CSSUnitType::CSS_VMIN:
case CSSUnitType::CSS_VMAX:
case CSSUnitType::CSS_DPPX:
case CSSUnitType::CSS_DPI:
case CSSUnitType::CSS_DPCM:
case CSSUnitType::CSS_FR:
case CSSUnitType::CSS_Q:
return true;
case CSSUnitType::CSS_UNKNOWN:
case CSSUnitType::CSS_STRING:
case CSSUnitType::CSS_FONT_FAMILY:
case CSSUnitType::CSS_URI:
case CSSUnitType::CSS_IDENT:
case CSSUnitType::CSS_ATTR:
case CSSUnitType::CSS_COUNTER:
case CSSUnitType::CSS_RECT:
case CSSUnitType::CSS_RGBCOLOR:
case CSSUnitType::CSS_PAIR:
case CSSUnitType::CSS_UNICODE_RANGE:
case CSSUnitType::CSS_COUNTER_NAME:
case CSSUnitType::CSS_SHAPE:
case CSSUnitType::CSS_QUAD:
case CSSUnitType::CSS_QUIRKY_EMS:
case CSSUnitType::CSS_CALC:
case CSSUnitType::CSS_CALC_PERCENTAGE_WITH_NUMBER:
case CSSUnitType::CSS_CALC_PERCENTAGE_WITH_LENGTH:
case CSSUnitType::CSS_PROPERTY_ID:
case CSSUnitType::CSS_VALUE_ID:
return false;
};
ASSERT_NOT_REACHED();
return false;
}
static CSSValueID functionFromOperator(CalcOperator op)
{
switch (op) {
case CalcOperator::Add:
case CalcOperator::Subtract:
case CalcOperator::Multiply:
case CalcOperator::Divide:
return CSSValueCalc;
case CalcOperator::Min:
return CSSValueMin;
case CalcOperator::Max:
return CSSValueMax;
case CalcOperator::Clamp:
return CSSValueClamp;
}
return CSSValueCalc;
}
#if !LOG_DISABLED
static String prettyPrintNode(const CSSCalcExpressionNode& node)
{
TextStream multilineStream;
multilineStream << node;
return multilineStream.release();
}
static String prettyPrintNodes(const Vector<Ref<CSSCalcExpressionNode>>& nodes)
{
TextStream multilineStream;
multilineStream << nodes;
return multilineStream.release();
}
#endif
class CSSCalcPrimitiveValueNode final : public CSSCalcExpressionNode {
WTF_MAKE_FAST_ALLOCATED;
public:
static Ref<CSSCalcPrimitiveValueNode> create(Ref<CSSPrimitiveValue>&& value)
{
return adoptRef(*new CSSCalcPrimitiveValueNode(WTFMove(value)));
}
static RefPtr<CSSCalcPrimitiveValueNode> create(double value, CSSUnitType type)
{
if (!std::isfinite(value))
return nullptr;
return adoptRef(new CSSCalcPrimitiveValueNode(CSSPrimitiveValue::create(value, type)));
}
String customCSSText() const
{
return m_value->cssText();
}
CSSUnitType primitiveType() const final
{
return m_value->primitiveType();
}
bool isNumericValue() const;
bool isNegative() const;
void negate();
void invert();
enum class UnitConversion {
Invalid,
Preserve,
Canonicalize
};
void add(const CSSCalcPrimitiveValueNode&, UnitConversion = UnitConversion::Preserve);
void multiply(double);
void convertToUnitType(CSSUnitType);
void canonicalizeUnit();
const CSSPrimitiveValue& value() const { return m_value.get(); }
private:
bool isZero() const final
{
return !m_value->doubleValue();
}
bool equals(const CSSCalcExpressionNode& other) const final;
Type type() const final { return CssCalcPrimitiveValue; }
std::unique_ptr<CalcExpressionNode> createCalcExpression(const CSSToLengthConversionData&) const final;
double doubleValue(CSSUnitType) const final;
double computeLengthPx(const CSSToLengthConversionData&) const final;
void collectDirectComputationalDependencies(HashSet<CSSPropertyID>&) const final;
void collectDirectRootComputationalDependencies(HashSet<CSSPropertyID>&) const final;
void dump(TextStream&) const final;
private:
explicit CSSCalcPrimitiveValueNode(Ref<CSSPrimitiveValue>&& value)
: CSSCalcExpressionNode(calcUnitCategory(value->primitiveType()))
, m_value(WTFMove(value))
{
}
Ref<CSSPrimitiveValue> m_value;
};
// FIXME: Use calcUnitCategory?
bool CSSCalcPrimitiveValueNode::isNumericValue() const
{
return m_value->isLength() || m_value->isNumber() || m_value->isPercentage() || m_value->isAngle()
|| m_value->isTime() || m_value->isResolution() || m_value->isFlex() || m_value->isFrequency();
}
bool CSSCalcPrimitiveValueNode::isNegative() const
{
return isNumericValue() && m_value->doubleValue() < 0.0;
}
void CSSCalcPrimitiveValueNode::negate()
{
ASSERT(isNumericValue());
m_value = CSSPrimitiveValue::create(0.0 - m_value->doubleValue(), m_value->primitiveType());
}
void CSSCalcPrimitiveValueNode::invert()
{
ASSERT(isNumericValue());
if (!m_value->doubleValue())
m_value = CSSPrimitiveValue::create(std::numeric_limits<double>::infinity(), m_value->primitiveType());
m_value = CSSPrimitiveValue::create(1.0 / m_value->doubleValue(), m_value->primitiveType());
}
void CSSCalcPrimitiveValueNode::add(const CSSCalcPrimitiveValueNode& node, UnitConversion unitConversion)
{
auto valueType = m_value->primitiveType();
switch (unitConversion) {
case UnitConversion::Invalid:
ASSERT_NOT_REACHED();
break;
case UnitConversion::Preserve:
ASSERT(node.primitiveType() == valueType);
m_value = CSSPrimitiveValue::create(m_value->doubleValue() + node.doubleValue(valueType), valueType);
break;
case UnitConversion::Canonicalize: {
auto valueCategory = unitCategory(valueType);
// FIXME: It's awkward that canonicalUnitTypeForCategory() has special handling for CSSUnitCategory::Percent.
auto canonicalType = valueCategory == CSSUnitCategory::Percent ? CSSUnitType::CSS_PERCENTAGE : canonicalUnitTypeForCategory(valueCategory);
ASSERT(canonicalType != CSSUnitType::CSS_UNKNOWN);
double leftValue = m_value->doubleValue(canonicalType);
double rightValue = node.doubleValue(canonicalType);
m_value = CSSPrimitiveValue::create(leftValue + rightValue, canonicalType);
break;
}
}
}
void CSSCalcPrimitiveValueNode::multiply(double multiplier)
{
auto valueType = m_value->primitiveType();
ASSERT(hasDoubleValue(valueType));
m_value = CSSPrimitiveValue::create(m_value->doubleValue(valueType) * multiplier, valueType);
}
void CSSCalcPrimitiveValueNode::convertToUnitType(CSSUnitType unitType)
{
ASSERT(unitCategory(unitType) == unitCategory(m_value->primitiveType()));
double newValue = m_value->doubleValue(unitType);
m_value = CSSPrimitiveValue::create(newValue, unitType);
}
void CSSCalcPrimitiveValueNode::canonicalizeUnit()
{
auto category = calculationCategoryForCombination(m_value->primitiveType());
if (category == CalculationCategory::Other)
return;
auto canonicalType = canonicalUnitTypeForCalculationCategory(category);
if (canonicalType == m_value->primitiveType())
return;
double newValue = m_value->doubleValue(canonicalType);
m_value = CSSPrimitiveValue::create(newValue, canonicalType);
}
std::unique_ptr<CalcExpressionNode> CSSCalcPrimitiveValueNode::createCalcExpression(const CSSToLengthConversionData& conversionData) const
{
switch (category()) {
case CalculationCategory::Number:
return makeUnique<CalcExpressionNumber>(m_value->floatValue());
case CalculationCategory::Length:
return makeUnique<CalcExpressionLength>(Length(m_value->computeLength<float>(conversionData), WebCore::Fixed));
case CalculationCategory::Percent:
case CalculationCategory::PercentLength: {
return makeUnique<CalcExpressionLength>(m_value->convertToLength<FixedFloatConversion | PercentConversion>(conversionData));
}
// Only types that could be part of a Length expression can be converted
// to a CalcExpressionNode. CalculationCategory::PercentNumber makes no sense as a Length.
case CalculationCategory::PercentNumber:
case CalculationCategory::Angle:
case CalculationCategory::Time:
case CalculationCategory::Frequency:
case CalculationCategory::Other:
ASSERT_NOT_REACHED();
}
ASSERT_NOT_REACHED();
return nullptr;
}
double CSSCalcPrimitiveValueNode::doubleValue(CSSUnitType unitType) const
{
if (hasDoubleValue(unitType)) {
// FIXME: This should ASSERT(unitCategory(m_value->primitiveType()) == unitCategory(unitType)), but only when all callers are fixed (e.g. webkit.org/b/204826).
if (unitCategory(m_value->primitiveType()) != unitCategory(unitType)) {
LOG_WITH_STREAM(Calc, stream << "Calling doubleValue() with unit " << unitType << " on a node of unit type " << m_value->primitiveType() << " which is incompatible");
return 0;
}
return m_value->doubleValue(unitType);
}
ASSERT_NOT_REACHED();
return 0;
}
double CSSCalcPrimitiveValueNode::computeLengthPx(const CSSToLengthConversionData& conversionData) const
{
switch (category()) {
case CalculationCategory::Length:
return m_value->computeLength<double>(conversionData);
case CalculationCategory::Percent:
case CalculationCategory::Number:
return m_value->doubleValue();
case CalculationCategory::PercentLength:
case CalculationCategory::PercentNumber:
case CalculationCategory::Angle:
case CalculationCategory::Time:
case CalculationCategory::Frequency:
case CalculationCategory::Other:
ASSERT_NOT_REACHED();
break;
}
ASSERT_NOT_REACHED();
return 0;
}
void CSSCalcPrimitiveValueNode::collectDirectComputationalDependencies(HashSet<CSSPropertyID>& values) const
{
m_value->collectDirectComputationalDependencies(values);
}
void CSSCalcPrimitiveValueNode::collectDirectRootComputationalDependencies(HashSet<CSSPropertyID>& values) const
{
m_value->collectDirectRootComputationalDependencies(values);
}
bool CSSCalcPrimitiveValueNode::equals(const CSSCalcExpressionNode& other) const
{
if (type() != other.type())
return false;
return compareCSSValue(m_value, static_cast<const CSSCalcPrimitiveValueNode&>(other).m_value);
}
void CSSCalcPrimitiveValueNode::dump(TextStream& ts) const
{
ts << "value " << m_value->customCSSText() << " (category: " << category() << ", type: " << primitiveType() << ")";
}
class CSSCalcNegateNode final : public CSSCalcExpressionNode {
public:
static Ref<CSSCalcNegateNode> create(Ref<CSSCalcExpressionNode>&& child)
{
return adoptRef(*new CSSCalcNegateNode(WTFMove(child)));
}
const CSSCalcExpressionNode& child() const { return m_child.get(); }
CSSCalcExpressionNode& child() { return m_child.get(); }
void setChild(Ref<CSSCalcExpressionNode>&& child) { m_child = WTFMove(child); }
private:
CSSCalcNegateNode(Ref<CSSCalcExpressionNode>&& child)
: CSSCalcExpressionNode(child->category())
, m_child(WTFMove(child))
{
}
std::unique_ptr<CalcExpressionNode> createCalcExpression(const CSSToLengthConversionData&) const final;
bool isZero() const final { return m_child->isZero(); }
double doubleValue(CSSUnitType unitType) const final { return -m_child->doubleValue(unitType); }
double computeLengthPx(const CSSToLengthConversionData& conversionData) const final { return -m_child->computeLengthPx(conversionData); }
Type type() const final { return Type::CssCalcNegate; }
CSSUnitType primitiveType() const final { return m_child->primitiveType(); }
void collectDirectComputationalDependencies(HashSet<CSSPropertyID>& properties) const final { m_child->collectDirectComputationalDependencies(properties); }
void collectDirectRootComputationalDependencies(HashSet<CSSPropertyID>& properties) const final { m_child->collectDirectRootComputationalDependencies(properties); }
void dump(TextStream&) const final;
Ref<CSSCalcExpressionNode> m_child;
};
std::unique_ptr<CalcExpressionNode> CSSCalcNegateNode::createCalcExpression(const CSSToLengthConversionData& conversionData) const
{
auto childNode = m_child->createCalcExpression(conversionData);
return makeUnique<CalcExpressionNegation>(WTFMove(childNode));
}
void CSSCalcNegateNode::dump(TextStream& ts) const
{
ts << "-" << m_child.get();
}
class CSSCalcInvertNode final : public CSSCalcExpressionNode {
public:
static Ref<CSSCalcInvertNode> create(Ref<CSSCalcExpressionNode>&& child)
{
return adoptRef(*new CSSCalcInvertNode(WTFMove(child)));
}
const CSSCalcExpressionNode& child() const { return m_child.get(); }
CSSCalcExpressionNode& child() { return m_child.get(); }
void setChild(Ref<CSSCalcExpressionNode>&& child) { m_child = WTFMove(child); }
private:
CSSCalcInvertNode(Ref<CSSCalcExpressionNode>&& child)
: CSSCalcExpressionNode(child->category())
, m_child(WTFMove(child))
{
}
std::unique_ptr<CalcExpressionNode> createCalcExpression(const CSSToLengthConversionData&) const final;
bool isZero() const final { return m_child->isZero(); }
double doubleValue(CSSUnitType) const final;
double computeLengthPx(const CSSToLengthConversionData&) const final;
Type type() const final { return Type::CssCalcInvert; }
CSSUnitType primitiveType() const final { return m_child->primitiveType(); }
void collectDirectComputationalDependencies(HashSet<CSSPropertyID>& properties) const final { m_child->collectDirectComputationalDependencies(properties); }
void collectDirectRootComputationalDependencies(HashSet<CSSPropertyID>& properties) const final { m_child->collectDirectRootComputationalDependencies(properties); }
void dump(TextStream&) const final;
Ref<CSSCalcExpressionNode> m_child;
};
std::unique_ptr<CalcExpressionNode> CSSCalcInvertNode::createCalcExpression(const CSSToLengthConversionData& conversionData) const
{
auto childNode = m_child->createCalcExpression(conversionData);
return makeUnique<CalcExpressionInversion>(WTFMove(childNode));
}
double CSSCalcInvertNode::doubleValue(CSSUnitType unitType) const
{
auto childValue = m_child->doubleValue(unitType);
if (!childValue)
return std::numeric_limits<double>::infinity();
return 1.0 / childValue;
}
double CSSCalcInvertNode::computeLengthPx(const CSSToLengthConversionData& conversionData) const
{
auto childValue = m_child->computeLengthPx(conversionData);
if (!childValue)
return std::numeric_limits<double>::infinity();
return 1.0 / childValue;
}
void CSSCalcInvertNode::dump(TextStream& ts) const
{
ts << "1/" << m_child.get();
}
// This is the result of the "To add two types type1 and type2, perform the following steps:" rules.
static const CalculationCategory addSubtractResult[static_cast<unsigned>(CalculationCategory::Angle)][static_cast<unsigned>(CalculationCategory::Angle)] = {
// CalculationCategory::Number CalculationCategory::Length CalculationCategory::Percent CalculationCategory::PercentNumber CalculationCategory::PercentLength
{ CalculationCategory::Number, CalculationCategory::Other, CalculationCategory::PercentNumber, CalculationCategory::PercentNumber, CalculationCategory::Other }, // CalculationCategory::Number
{ CalculationCategory::Other, CalculationCategory::Length, CalculationCategory::PercentLength, CalculationCategory::Other, CalculationCategory::PercentLength }, // CalculationCategory::Length
{ CalculationCategory::PercentNumber, CalculationCategory::PercentLength, CalculationCategory::Percent, CalculationCategory::PercentNumber, CalculationCategory::PercentLength }, // CalculationCategory::Percent
{ CalculationCategory::PercentNumber, CalculationCategory::Other, CalculationCategory::PercentNumber, CalculationCategory::PercentNumber, CalculationCategory::Other }, // CalculationCategory::PercentNumber
{ CalculationCategory::Other, CalculationCategory::PercentLength, CalculationCategory::PercentLength, CalculationCategory::Other, CalculationCategory::PercentLength }, // CalculationCategory::PercentLength
};
static CalculationCategory determineCategory(const CSSCalcExpressionNode& leftSide, const CSSCalcExpressionNode& rightSide, CalcOperator op)
{
CalculationCategory leftCategory = leftSide.category();
CalculationCategory rightCategory = rightSide.category();
ASSERT(leftCategory < CalculationCategory::Other);
ASSERT(rightCategory < CalculationCategory::Other);
switch (op) {
case CalcOperator::Add:
case CalcOperator::Subtract:
if (leftCategory < CalculationCategory::Angle && rightCategory < CalculationCategory::Angle)
return addSubtractResult[static_cast<unsigned>(leftCategory)][static_cast<unsigned>(rightCategory)];
if (leftCategory == rightCategory)
return leftCategory;
return CalculationCategory::Other;
case CalcOperator::Multiply:
if (leftCategory != CalculationCategory::Number && rightCategory != CalculationCategory::Number)
return CalculationCategory::Other;
return leftCategory == CalculationCategory::Number ? rightCategory : leftCategory;
case CalcOperator::Divide:
if (rightCategory != CalculationCategory::Number || rightSide.isZero())
return CalculationCategory::Other;
return leftCategory;
case CalcOperator::Min:
case CalcOperator::Max:
case CalcOperator::Clamp:
ASSERT_NOT_REACHED();
return CalculationCategory::Other;
}
ASSERT_NOT_REACHED();
return CalculationCategory::Other;
}
// FIXME: Need to implement correct category computation per:
// <https://drafts.css-houdini.org/css-typed-om-1/#cssnumericvalue-invert-a-type>
// To invert a type type, perform the following steps:
// Let result be a new type with an initially empty ordered map and an initially null percent hint
// For each unit → exponent of type, set result[unit] to (-1 * exponent).
static CalculationCategory categoryForInvert(CalculationCategory category)
{
return category;
}
static CalculationCategory determineCategory(const Vector<Ref<CSSCalcExpressionNode>>& nodes, CalcOperator op)
{
if (nodes.isEmpty())
return CalculationCategory::Other;
auto currentCategory = nodes[0]->category();
for (unsigned i = 1; i < nodes.size(); ++i) {
const auto& node = nodes[i].get();
auto usedOperator = op;
if (node.type() == CSSCalcExpressionNode::Type::CssCalcInvert)
usedOperator = CalcOperator::Divide;
auto nextCategory = node.category();
switch (usedOperator) {
case CalcOperator::Add:
case CalcOperator::Subtract:
// <https://drafts.css-houdini.org/css-typed-om-1/#cssnumericvalue-add-two-types>
// At a + or - sub-expression, attempt to add the types of the left and right arguments.
// If this returns failure, the entire calculation’s type is failure. Otherwise, the sub-expression’s type is the returned type.
if (currentCategory < CalculationCategory::Angle && nextCategory < CalculationCategory::Angle)
currentCategory = addSubtractResult[static_cast<unsigned>(currentCategory)][static_cast<unsigned>(nextCategory)];
else if (currentCategory != nextCategory)
return CalculationCategory::Other;
break;
case CalcOperator::Multiply:
// <https://drafts.css-houdini.org/css-typed-om-1/#cssnumericvalue-multiply-two-types>
// At a * sub-expression, multiply the types of the left and right arguments. The sub-expression’s type is the returned result.
if (currentCategory != CalculationCategory::Number && nextCategory != CalculationCategory::Number)
return CalculationCategory::Other;
currentCategory = currentCategory == CalculationCategory::Number ? nextCategory : currentCategory;
break;
case CalcOperator::Divide: {
auto invertCategory = categoryForInvert(nextCategory);
// At a / sub-expression, let left type be the result of finding the types of its left argument,
// and right type be the result of finding the types of its right argument and then inverting it.
// The sub-expression’s type is the result of multiplying the left type and right type.
if (invertCategory != CalculationCategory::Number || node.isZero())
return CalculationCategory::Other;
break;
}
case CalcOperator::Min:
case CalcOperator::Max:
case CalcOperator::Clamp:
// The type of a min(), max(), or clamp() expression is the result of adding the types of its comma-separated calculations
return CalculationCategory::Other;
}
}
return currentCategory;
}
static CalculationCategory resolvedTypeForMinOrMaxOrClamp(CalculationCategory category, CalculationCategory destinationCategory)
{
switch (category) {
case CalculationCategory::Number:
case CalculationCategory::Length:
case CalculationCategory::PercentNumber:
case CalculationCategory::PercentLength:
case CalculationCategory::Angle:
case CalculationCategory::Time:
case CalculationCategory::Frequency:
case CalculationCategory::Other:
return category;
case CalculationCategory::Percent:
if (destinationCategory == CalculationCategory::Length)
return CalculationCategory::PercentLength;
if (destinationCategory == CalculationCategory::Number)
return CalculationCategory::PercentNumber;
return category;
}
return CalculationCategory::Other;
}
static bool isSamePair(CalculationCategory a, CalculationCategory b, CalculationCategory x, CalculationCategory y)
{
return (a == x && b == y) || (a == y && b == x);
}
class CSSCalcOperationNode final : public CSSCalcExpressionNode {
WTF_MAKE_FAST_ALLOCATED;
public:
static RefPtr<CSSCalcOperationNode> create(CalcOperator, RefPtr<CSSCalcExpressionNode>&& leftSide, RefPtr<CSSCalcExpressionNode>&& rightSide);
static RefPtr<CSSCalcOperationNode> createSum(Vector<Ref<CSSCalcExpressionNode>>&& values);
static RefPtr<CSSCalcOperationNode> createProduct(Vector<Ref<CSSCalcExpressionNode>>&& values);
static RefPtr<CSSCalcOperationNode> createMinOrMaxOrClamp(CalcOperator, Vector<Ref<CSSCalcExpressionNode>>&& values, CalculationCategory destinationCategory);
static Ref<CSSCalcExpressionNode> simplify(Ref<CSSCalcExpressionNode>&&);
static void buildCSSText(const CSSCalcExpressionNode&, StringBuilder&);
CalcOperator calcOperator() const { return m_operator; }
bool isCalcSumNode() const { return m_operator == CalcOperator::Add; }
bool isCalcProductNode() const { return m_operator == CalcOperator::Multiply; }
bool isMinOrMaxNode() const { return m_operator == CalcOperator::Min || m_operator == CalcOperator::Max; }
bool shouldSortChildren() const { return isCalcSumNode() || isCalcProductNode(); }
void hoistChildrenWithOperator(CalcOperator);
void combineChildren();
bool canCombineAllChildren() const;
const Vector<Ref<CSSCalcExpressionNode>>& children() const { return m_children; }
Vector<Ref<CSSCalcExpressionNode>>& children() { return m_children; }
private:
CSSCalcOperationNode(CalculationCategory category, CalcOperator op, Ref<CSSCalcExpressionNode>&& leftSide, Ref<CSSCalcExpressionNode>&& rightSide)
: CSSCalcExpressionNode(category)
, m_operator(op)
{
m_children.reserveInitialCapacity(2);
m_children.uncheckedAppend(WTFMove(leftSide));
m_children.uncheckedAppend(WTFMove(rightSide));
}
CSSCalcOperationNode(CalculationCategory category, CalcOperator op, Vector<Ref<CSSCalcExpressionNode>>&& children)
: CSSCalcExpressionNode(category)
, m_operator(op)
, m_children(WTFMove(children))
{
}
Type type() const final { return CssCalcOperation; }
bool isZero() const final
{
return !doubleValue(primitiveType());
}
bool equals(const CSSCalcExpressionNode&) const final;
std::unique_ptr<CalcExpressionNode> createCalcExpression(const CSSToLengthConversionData&) const final;
CSSUnitType primitiveType() const final;
double doubleValue(CSSUnitType) const final;
double computeLengthPx(const CSSToLengthConversionData&) const final;
void collectDirectComputationalDependencies(HashSet<CSSPropertyID>&) const final;
void collectDirectRootComputationalDependencies(HashSet<CSSPropertyID>&) const final;
void dump(TextStream&) const final;
static CSSCalcExpressionNode* getNumberSide(CSSCalcExpressionNode& leftSide, CSSCalcExpressionNode& rightSide)
{
if (leftSide.category() == CalculationCategory::Number)
return &leftSide;
if (rightSide.category() == CalculationCategory::Number)
return &rightSide;
return nullptr;
}
double evaluate(const Vector<double>& children) const
{
return evaluateOperator(m_operator, children);
}
static double evaluateOperator(CalcOperator, const Vector<double>&);
static Ref<CSSCalcExpressionNode> simplifyNode(Ref<CSSCalcExpressionNode>&&, int depth);
static Ref<CSSCalcExpressionNode> simplifyRecursive(Ref<CSSCalcExpressionNode>&&, int depth);
enum class GroupingParens {
Omit,
Include
};
static void buildCSSTextRecursive(const CSSCalcExpressionNode&, StringBuilder&, GroupingParens = GroupingParens::Include);
const CalcOperator m_operator;
Vector<Ref<CSSCalcExpressionNode>> m_children;
};
RefPtr<CSSCalcOperationNode> CSSCalcOperationNode::create(CalcOperator op, RefPtr<CSSCalcExpressionNode>&& leftSide, RefPtr<CSSCalcExpressionNode>&& rightSide)
{
if (!leftSide || !rightSide)
return nullptr;
ASSERT(op == CalcOperator::Add || op == CalcOperator::Multiply);
ASSERT(leftSide->category() < CalculationCategory::Other);
ASSERT(rightSide->category() < CalculationCategory::Other);
auto newCategory = determineCategory(*leftSide, *rightSide, op);
if (newCategory == CalculationCategory::Other) {
LOG_WITH_STREAM(Calc, stream << "Failed to create CSSCalcOperationNode " << op << " node because unable to determine category from " << prettyPrintNode(*leftSide) << " and " << *rightSide);
return nullptr;
}
return adoptRef(new CSSCalcOperationNode(newCategory, op, leftSide.releaseNonNull(), rightSide.releaseNonNull()));
}
RefPtr<CSSCalcOperationNode> CSSCalcOperationNode::createSum(Vector<Ref<CSSCalcExpressionNode>>&& values)
{
if (values.isEmpty())
return nullptr;
auto newCategory = determineCategory(values, CalcOperator::Add);
if (newCategory == CalculationCategory::Other) {
LOG_WITH_STREAM(Calc, stream << "Failed to create sum node because unable to determine category from " << prettyPrintNodes(values));
newCategory = determineCategory(values, CalcOperator::Add);
return nullptr;
}
return adoptRef(new CSSCalcOperationNode(newCategory, CalcOperator::Add, WTFMove(values)));
}
RefPtr<CSSCalcOperationNode> CSSCalcOperationNode::createProduct(Vector<Ref<CSSCalcExpressionNode>>&& values)
{
if (values.isEmpty())
return nullptr;
auto newCategory = determineCategory(values, CalcOperator::Multiply);
if (newCategory == CalculationCategory::Other) {
LOG_WITH_STREAM(Calc, stream << "Failed to create product node because unable to determine category from " << prettyPrintNodes(values));
return nullptr;
}
return adoptRef(new CSSCalcOperationNode(newCategory, CalcOperator::Multiply, WTFMove(values)));
}
RefPtr<CSSCalcOperationNode> CSSCalcOperationNode::createMinOrMaxOrClamp(CalcOperator op, Vector<Ref<CSSCalcExpressionNode>>&& values, CalculationCategory destinationCategory)
{
ASSERT(op == CalcOperator::Min || op == CalcOperator::Max || op == CalcOperator::Clamp);
ASSERT_IMPLIES(op == CalcOperator::Clamp, values.size() == 3);
Optional<CalculationCategory> category = WTF::nullopt;
for (auto& value : values) {
auto valueCategory = resolvedTypeForMinOrMaxOrClamp(value->category(), destinationCategory);
ASSERT(valueCategory < CalculationCategory::Other);
if (!category) {
if (valueCategory == CalculationCategory::Other) {
LOG_WITH_STREAM(Calc, stream << "Failed to create CSSCalcOperationNode " << op << " node because unable to determine category from " << prettyPrintNodes(values));
return nullptr;
}
category = valueCategory;
}
if (category != valueCategory) {
if (isSamePair(category.value(), valueCategory, CalculationCategory::Length, CalculationCategory::PercentLength)) {
category = CalculationCategory::PercentLength;
continue;
}
if (isSamePair(category.value(), valueCategory, CalculationCategory::Number, CalculationCategory::PercentNumber)) {
category = CalculationCategory::PercentNumber;
continue;
}
return nullptr;
}
}
return adoptRef(new CSSCalcOperationNode(category.value(), op, WTFMove(values)));
}
void CSSCalcOperationNode::hoistChildrenWithOperator(CalcOperator op)
{
ASSERT(op == CalcOperator::Add || op == CalcOperator::Multiply);
auto hasChildWithOperator = [&] (CalcOperator op) {
for (auto& child : m_children) {
if (is<CSSCalcOperationNode>(child.get()) && downcast<CSSCalcOperationNode>(child.get()).calcOperator() == op)
return true;
}
return false;
};
if (!hasChildWithOperator(op))
return;
Vector<Ref<CSSCalcExpressionNode>> newChildren;
for (auto& child : m_children) {
if (is<CSSCalcOperationNode>(child.get()) && downcast<CSSCalcOperationNode>(child.get()).calcOperator() == op) {
auto& children = downcast<CSSCalcOperationNode>(child.get()).children();
for (auto& childToMove : children)
newChildren.append(WTFMove(childToMove));
} else
newChildren.append(WTFMove(child));
}
newChildren.shrinkToFit();
m_children = WTFMove(newChildren);
}
enum class SortingCategory {
Number,
Percent,
Dimension,
Other
};
static SortingCategory sortingCategoryForType(CSSUnitType unitType)
{
static constexpr SortingCategory sortOrder[] = {
SortingCategory::Number, // CalculationCategory::Number,
SortingCategory::Dimension, // CalculationCategory::Length,
SortingCategory::Percent, // CalculationCategory::Percent,
SortingCategory::Number, // CalculationCategory::PercentNumber,
SortingCategory::Dimension, // CalculationCategory::PercentLength,
SortingCategory::Dimension, // CalculationCategory::Angle,
SortingCategory::Dimension, // CalculationCategory::Time,
SortingCategory::Dimension, // CalculationCategory::Frequency,
SortingCategory::Other, // UOther
};
COMPILE_ASSERT(ARRAY_SIZE(sortOrder) == static_cast<unsigned>(CalculationCategory::Other) + 1, sortOrder_size_should_match_UnitCategory);
return sortOrder[static_cast<unsigned>(calcUnitCategory(unitType))];
}
static SortingCategory sortingCategory(const CSSCalcExpressionNode& node)
{
if (is<CSSCalcPrimitiveValueNode>(node))
return sortingCategoryForType(node.primitiveType());
return SortingCategory::Other;
}
static CSSUnitType primitiveTypeForCombination(const CSSCalcExpressionNode& node)
{
if (is<CSSCalcPrimitiveValueNode>(node))
return node.primitiveType();
return CSSUnitType::CSS_UNKNOWN;
}
static CSSCalcPrimitiveValueNode::UnitConversion conversionToAddValuesWithTypes(CSSUnitType firstType, CSSUnitType secondType)
{
if (firstType == CSSUnitType::CSS_UNKNOWN || secondType == CSSUnitType::CSS_UNKNOWN)
return CSSCalcPrimitiveValueNode::UnitConversion::Invalid;
auto firstCategory = calculationCategoryForCombination(firstType);
// Compatible types.
if (firstCategory != CalculationCategory::Other && firstCategory == calculationCategoryForCombination(secondType))
return CSSCalcPrimitiveValueNode::UnitConversion::Canonicalize;
// Matching types.
if (firstType == secondType && hasDoubleValue(firstType))
return CSSCalcPrimitiveValueNode::UnitConversion::Preserve;
return CSSCalcPrimitiveValueNode::UnitConversion::Invalid;
}
bool CSSCalcOperationNode::canCombineAllChildren() const
{
if (m_children.size() < 2)
return false;
if (!is<CSSCalcPrimitiveValueNode>(m_children[0]))
return false;
auto firstUnitType = m_children[0]->primitiveType();
auto firstCategory = calculationCategoryForCombination(m_children[0]->primitiveType());
for (unsigned i = 1; i < m_children.size(); ++i) {
auto& node = m_children[i];
if (!is<CSSCalcPrimitiveValueNode>(node))
return false;
auto nodeUnitType = node->primitiveType();
auto nodeCategory = calculationCategoryForCombination(nodeUnitType);
if (nodeCategory != firstCategory)
return false;
if (nodeCategory == CalculationCategory::Other && nodeUnitType != firstUnitType)
return false;
if (!hasDoubleValue(nodeUnitType))
return false;
}
return true;
}
void CSSCalcOperationNode::combineChildren()
{
if (m_children.size() < 2)
return;
if (shouldSortChildren()) {
// <https://drafts.csswg.org/css-values-4/#sort-a-calculations-children>
std::stable_sort(m_children.begin(), m_children.end(), [](const auto& first, const auto& second) {
// Sort order: number, percentage, dimension, other.
SortingCategory firstCategory = sortingCategory(first.get());
SortingCategory secondCategory = sortingCategory(second.get());
if (firstCategory == SortingCategory::Dimension && secondCategory == SortingCategory::Dimension) {
// If nodes contains any dimensions, remove them from nodes, sort them by their units, and append them to ret.
auto firstUnitString = CSSPrimitiveValue::unitTypeString(first->primitiveType());
auto secondUnitString = CSSPrimitiveValue::unitTypeString(second->primitiveType());
return codePointCompareLessThan(firstUnitString, secondUnitString);
}
return static_cast<unsigned>(firstCategory) < static_cast<unsigned>(secondCategory);
});
LOG_WITH_STREAM(Calc, stream << "post-sort: " << *this);
}
if (calcOperator() == CalcOperator::Add) {
// For each set of root’s children that are numeric values with identical units,
// remove those children and replace them with a single numeric value containing
// the sum of the removed nodes, and with the same unit.
Vector<Ref<CSSCalcExpressionNode>> newChildren;
newChildren.reserveInitialCapacity(m_children.size());
newChildren.uncheckedAppend(m_children[0].copyRef());
CSSUnitType previousType = primitiveTypeForCombination(newChildren[0].get());
for (unsigned i = 1; i < m_children.size(); ++i) {
auto& currentNode = m_children[i];
CSSUnitType currentType = primitiveTypeForCombination(currentNode.get());
auto conversionType = conversionToAddValuesWithTypes(previousType, currentType);
if (conversionType != CSSCalcPrimitiveValueNode::UnitConversion::Invalid) {
downcast<CSSCalcPrimitiveValueNode>(newChildren.last().get()).add(downcast<CSSCalcPrimitiveValueNode>(currentNode.get()), conversionType);
continue;
}
previousType = primitiveTypeForCombination(currentNode);
newChildren.uncheckedAppend(currentNode.copyRef());
}
newChildren.shrinkToFit();
m_children = WTFMove(newChildren);
return;
}
if (calcOperator() == CalcOperator::Multiply) {
// If root has multiple children that are numbers (not percentages or dimensions),
// remove them and replace them with a single number containing the product of the removed nodes.
double multiplier = 1;
// Sorting will have put the number nodes first.
unsigned leadingNumberNodeCount = 0;
for (auto& node : m_children) {
auto nodeType = primitiveTypeForCombination(node.get());
if (nodeType != CSSUnitType::CSS_NUMBER)
break;
multiplier *= node->doubleValue(CSSUnitType::CSS_NUMBER);
++leadingNumberNodeCount;
}
Vector<Ref<CSSCalcExpressionNode>> newChildren;
newChildren.reserveInitialCapacity(m_children.size());
// If root contains only two children, one of which is a number (not a percentage or dimension) and the other of
// which is a Sum whose children are all numeric values, multiply all of the Sum’s children by the number, then
// return the Sum.
// The Sum's children simplification will have happened already.
bool didMultipy = false;
if (leadingNumberNodeCount && m_children.size() - leadingNumberNodeCount == 1) {
auto multiplicandCategory = calcUnitCategory(primitiveTypeForCombination(m_children.last().get()));
if (multiplicandCategory != CalculationCategory::Other) {
newChildren.uncheckedAppend(m_children.last().copyRef());
downcast<CSSCalcPrimitiveValueNode>(newChildren[0].get()).multiply(multiplier);
didMultipy = true;
}
}
if (!didMultipy) {
if (leadingNumberNodeCount) {
auto multiplierNode = CSSCalcPrimitiveValueNode::create(CSSPrimitiveValue::create(multiplier, CSSUnitType::CSS_NUMBER));
newChildren.uncheckedAppend(WTFMove(multiplierNode));
}
for (unsigned i = leadingNumberNodeCount; i < m_children.size(); ++i)
newChildren.uncheckedAppend(m_children[i].copyRef());
}
newChildren.shrinkToFit();
m_children = WTFMove(newChildren);
}
if (isMinOrMaxNode() && canCombineAllChildren()) {
auto combinedUnitType = m_children[0]->primitiveType();
auto category = calculationCategoryForCombination(combinedUnitType);
if (category != CalculationCategory::Other)
combinedUnitType = canonicalUnitTypeForCalculationCategory(category);
double resolvedValue = doubleValue(combinedUnitType);
auto newChild = CSSCalcPrimitiveValueNode::create(CSSPrimitiveValue::create(resolvedValue, combinedUnitType));
m_children.clear();
m_children.append(WTFMove(newChild));
}
}
// https://drafts.csswg.org/css-values-4/#simplify-a-calculation-tree
Ref<CSSCalcExpressionNode> CSSCalcOperationNode::simplify(Ref<CSSCalcExpressionNode>&& rootNode)
{
return simplifyRecursive(WTFMove(rootNode), 0);
}
Ref<CSSCalcExpressionNode> CSSCalcOperationNode::simplifyRecursive(Ref<CSSCalcExpressionNode>&& rootNode, int depth)
{
if (is<CSSCalcOperationNode>(rootNode)) {
auto& operationNode = downcast<CSSCalcOperationNode>(rootNode.get());
auto& children = operationNode.children();
for (unsigned i = 0; i < children.size(); ++i) {
auto child = children[i].copyRef();
auto newNode = simplifyRecursive(WTFMove(child), depth + 1);
if (newNode.ptr() != children[i].ptr())
children[i] = WTFMove(newNode);
}
} else if (is<CSSCalcNegateNode>(rootNode)) {
auto& negateNode = downcast<CSSCalcNegateNode>(rootNode.get());
Ref<CSSCalcExpressionNode> child = negateNode.child();
auto newNode = simplifyRecursive(WTFMove(child), depth + 1);
if (newNode.ptr() != &negateNode.child())
negateNode.setChild(WTFMove(newNode));
} else if (is<CSSCalcInvertNode>(rootNode)) {
auto& invertNode = downcast<CSSCalcInvertNode>(rootNode.get());
Ref<CSSCalcExpressionNode> child = invertNode.child();
auto newNode = simplifyRecursive(WTFMove(child), depth + 1);
if (newNode.ptr() != &invertNode.child())
invertNode.setChild(WTFMove(newNode));
}
return simplifyNode(WTFMove(rootNode), depth);
}
Ref<CSSCalcExpressionNode> CSSCalcOperationNode::simplifyNode(Ref<CSSCalcExpressionNode>&& rootNode, int depth)
{
if (is<CSSCalcPrimitiveValueNode>(rootNode)) {
// If root is a percentage that will be resolved against another value, and there is enough information
// available to resolve it, do so, and express the resulting numeric value in the appropriate canonical
// unit. Return the value.
// If root is a dimension that is not expressed in its canonical unit, and there is enough information
// available to convert it to the canonical unit, do so, and return the value.
auto& primitiveValueNode = downcast<CSSCalcPrimitiveValueNode>(rootNode.get());
primitiveValueNode.canonicalizeUnit();
return WTFMove(rootNode);
}
// If root is an operator node that’s not one of the calc-operator nodes, and all of its children are numeric values
// with enough information to computed the operation root represents, return the result of running root’s operation
// using its children, expressed in the result’s canonical unit.
if (is<CSSCalcOperationNode>(rootNode)) {
auto& calcOperationNode = downcast<CSSCalcOperationNode>(rootNode.get());
// Don't simplify at the root, otherwise we lose track of the operation for serialization.
if (calcOperationNode.children().size() == 1 && depth)
return WTFMove(calcOperationNode.children()[0]);
if (calcOperationNode.isCalcSumNode()) {
calcOperationNode.hoistChildrenWithOperator(CalcOperator::Add);
calcOperationNode.combineChildren();
}
if (calcOperationNode.isCalcProductNode()) {
calcOperationNode.hoistChildrenWithOperator(CalcOperator::Multiply);
calcOperationNode.combineChildren();
}
if (calcOperationNode.isMinOrMaxNode())
calcOperationNode.combineChildren();
// If only one child remains, return the child (except at the root).
auto shouldCombineParentWithOnlyChild = [](const CSSCalcOperationNode& parent, int depth)
{
if (parent.children().size() != 1)
return false;
// Always simplify below the root.
if (depth)
return true;
// At the root, preserve the root function by only merging nodes with the same function.
auto& child = parent.children().first();
if (!is<CSSCalcOperationNode>(child))
return false;
auto parentFunction = functionFromOperator(parent.calcOperator());
auto childFunction = functionFromOperator(downcast<CSSCalcOperationNode>(child.get()).calcOperator());
return childFunction == parentFunction;
};
if (shouldCombineParentWithOnlyChild(calcOperationNode, depth))
return WTFMove(calcOperationNode.children().first());
return WTFMove(rootNode);
}
if (is<CSSCalcNegateNode>(rootNode)) {
auto& childNode = downcast<CSSCalcNegateNode>(rootNode.get()).child();
// If root’s child is a numeric value, return an equivalent numeric value, but with the value negated (0 - value).
if (is<CSSCalcPrimitiveValueNode>(childNode) && downcast<CSSCalcPrimitiveValueNode>(childNode).isNumericValue()) {
downcast<CSSCalcPrimitiveValueNode>(childNode).negate();
return childNode;
}
// If root’s child is a Negate node, return the child’s child.
if (is<CSSCalcNegateNode>(childNode))
return downcast<CSSCalcNegateNode>(childNode).child();
return WTFMove(rootNode);
}
if (is<CSSCalcInvertNode>(rootNode)) {
auto& childNode = downcast<CSSCalcInvertNode>(rootNode.get()).child();
// If root’s child is a number (not a percentage or dimension) return the reciprocal of the child’s value.
if (is<CSSCalcPrimitiveValueNode>(childNode) && downcast<CSSCalcPrimitiveValueNode>(childNode).isNumericValue()) {
downcast<CSSCalcPrimitiveValueNode>(childNode).invert();
return childNode;
}
// If root’s child is an Invert node, return the child’s child.
if (is<CSSCalcInvertNode>(childNode))
return downcast<CSSCalcInvertNode>(childNode).child();
return WTFMove(rootNode);
}
return WTFMove(rootNode);
}
CSSUnitType CSSCalcOperationNode::primitiveType() const
{
auto unitCategory = category();
switch (unitCategory) {
case CalculationCategory::Number:
#if ASSERT_ENABLED
for (auto& child : m_children)
ASSERT(child->category() == CalculationCategory::Number);
#endif
return CSSUnitType::CSS_NUMBER;
case CalculationCategory::Percent: {
if (m_children.isEmpty())
return CSSUnitType::CSS_UNKNOWN;
if (m_children.size() == 2) {
if (m_children[0]->category() == CalculationCategory::Number)
return m_children[1]->primitiveType();
if (m_children[1]->category() == CalculationCategory::Number)
return m_children[0]->primitiveType();
}
CSSUnitType firstType = m_children[0]->primitiveType();
for (auto& child : m_children) {
if (firstType != child->primitiveType())
return CSSUnitType::CSS_UNKNOWN;
}
return firstType;
}
case CalculationCategory::Length:
case CalculationCategory::Angle:
case CalculationCategory::Time:
case CalculationCategory::Frequency:
if (m_children.size() == 1)
return m_children.first()->primitiveType();
return canonicalUnitTypeForCalculationCategory(unitCategory);
case CalculationCategory::PercentLength:
case CalculationCategory::PercentNumber:
case CalculationCategory::Other:
return CSSUnitType::CSS_UNKNOWN;
}
ASSERT_NOT_REACHED();
return CSSUnitType::CSS_UNKNOWN;
}
std::unique_ptr<CalcExpressionNode> CSSCalcOperationNode::createCalcExpression(const CSSToLengthConversionData& conversionData) const
{
Vector<std::unique_ptr<CalcExpressionNode>> nodes;
nodes.reserveInitialCapacity(m_children.size());
for (auto& child : m_children) {
auto node = child->createCalcExpression(conversionData);
if (!node)
return nullptr;
nodes.uncheckedAppend(WTFMove(node));
}
return makeUnique<CalcExpressionOperation>(WTFMove(nodes), m_operator);
}
double CSSCalcOperationNode::doubleValue(CSSUnitType unitType) const
{
bool allowNumbers = calcOperator() == CalcOperator::Multiply;
return evaluate(m_children.map([&] (auto& child) {
CSSUnitType childType = unitType;
if (allowNumbers && unitType != CSSUnitType::CSS_NUMBER && child->primitiveType() == CSSUnitType::CSS_NUMBER)
childType = CSSUnitType::CSS_NUMBER;
return child->doubleValue(childType);
}));
}
double CSSCalcOperationNode::computeLengthPx(const CSSToLengthConversionData& conversionData) const
{
return evaluate(m_children.map([&] (auto& child) {
return child->computeLengthPx(conversionData);
}));
}
void CSSCalcOperationNode::collectDirectComputationalDependencies(HashSet<CSSPropertyID>& values) const
{
for (auto& child : m_children)
child->collectDirectComputationalDependencies(values);
}
void CSSCalcOperationNode::collectDirectRootComputationalDependencies(HashSet<CSSPropertyID>& values) const
{
for (auto& child : m_children)
child->collectDirectRootComputationalDependencies(values);
}
void CSSCalcOperationNode::buildCSSText(const CSSCalcExpressionNode& node, StringBuilder& builder)
{
auto shouldOutputEnclosingCalc = [](const CSSCalcExpressionNode& rootNode) {
if (is<CSSCalcOperationNode>(rootNode)) {
auto& operationNode = downcast<CSSCalcOperationNode>(rootNode);
return operationNode.isCalcSumNode() || operationNode.isCalcProductNode();
}
return true;
};
bool outputCalc = shouldOutputEnclosingCalc(node);
if (outputCalc)
builder.append("calc(");
buildCSSTextRecursive(node, builder, GroupingParens::Omit);
if (outputCalc)
builder.append(')');
}
static const char* functionPrefixForOperator(CalcOperator op)
{
switch (op) {
case CalcOperator::Add:
case CalcOperator::Subtract:
case CalcOperator::Multiply:
case CalcOperator::Divide:
ASSERT_NOT_REACHED();
return "";
case CalcOperator::Min: return "min(";
case CalcOperator::Max: return "max(";
case CalcOperator::Clamp: return "clamp(";
}
return "";
}
// <https://drafts.csswg.org/css-values-4/#serialize-a-calculation-tree>
void CSSCalcOperationNode::buildCSSTextRecursive(const CSSCalcExpressionNode& node, StringBuilder& builder, GroupingParens parens)
{
// If root is a numeric value, or a non-math function, serialize root per the normal rules for it and return the result.
if (is<CSSCalcPrimitiveValueNode>(node)) {
auto& valueNode = downcast<CSSCalcPrimitiveValueNode>(node);
builder.append(valueNode.customCSSText());
return;
}
if (is<CSSCalcOperationNode>(node)) {
auto& operationNode = downcast<CSSCalcOperationNode>(node);
if (operationNode.isCalcSumNode()) {
// If root is a Sum node, let s be a string initially containing "(".
if (parens == GroupingParens::Include)
builder.append('(');
// Simplification already sorted children.
auto& children = operationNode.children();
ASSERT(children.size());
// Serialize root’s first child, and append it to s.
buildCSSTextRecursive(children.first(), builder);
// For each child of root beyond the first:
// If child is a Negate node, append " - " to s, then serialize the Negate’s child and append the result to s.
// If child is a negative numeric value, append " - " to s, then serialize the negation of child as normal and append the result to s.
// Otherwise, append " + " to s, then serialize child and append the result to s.
for (unsigned i = 1; i < children.size(); ++i) {
auto& child = children[i];
if (is<CSSCalcNegateNode>(child)) {
builder.append(" - ");
buildCSSTextRecursive(downcast<CSSCalcNegateNode>(child.get()).child(), builder);
continue;
}
if (is<CSSCalcPrimitiveValueNode>(child)) {
auto& primitiveValueNode = downcast<CSSCalcPrimitiveValueNode>(child.get());
if (primitiveValueNode.isNegative()) {
builder.append(" - ");
// Serialize the negation of child.
auto unitType = primitiveValueNode.value().primitiveType();
builder.append(0 - primitiveValueNode.value().doubleValue(), CSSPrimitiveValue::unitTypeString(unitType));
continue;
}
}
builder.append(" + ");
buildCSSTextRecursive(child, builder);
}
if (parens == GroupingParens::Include)
builder.append(')');
return;
}
if (operationNode.isCalcProductNode()) {
// If root is a Product node, let s be a string initially containing "(".
if (parens == GroupingParens::Include)
builder.append('(');
// Simplification already sorted children.
auto& children = operationNode.children();
ASSERT(children.size());
// Serialize root’s first child, and append it to s.
buildCSSTextRecursive(children.first(), builder);
// For each child of root beyond the first:
// If child is an Invert node, append " / " to s, then serialize the Invert’s child and append the result to s.
// Otherwise, append " * " to s, then serialize child and append the result to s.
for (unsigned i = 1; i < children.size(); ++i) {
auto& child = children[i];
if (is<CSSCalcInvertNode>(child)) {
builder.append(" / ");
buildCSSTextRecursive(downcast<CSSCalcInvertNode>(child.get()).child(), builder);
continue;
}
builder.append(" * ");
buildCSSTextRecursive(child, builder);
}
if (parens == GroupingParens::Include)
builder.append(')');
return;
}
// If root is anything but a Sum, Negate, Product, or Invert node, serialize a math function for the
// function corresponding to the node type, treating the node’s children as the function’s
// comma-separated calculation arguments, and return the result.
builder.append(functionPrefixForOperator(operationNode.calcOperator()));
auto& children = operationNode.children();
ASSERT(children.size());
buildCSSTextRecursive(children.first(), builder, GroupingParens::Omit);
for (unsigned i = 1; i < children.size(); ++i) {
builder.append(", ");
buildCSSTextRecursive(children[i], builder, GroupingParens::Omit);
}
builder.append(')');
return;
}
if (is<CSSCalcNegateNode>(node)) {
auto& negateNode = downcast<CSSCalcNegateNode>(node);
// If root is a Negate node, let s be a string initially containing "(-1 * ".
builder.append("-1 *");
buildCSSTextRecursive(negateNode.child(), builder);
return;
}
if (is<CSSCalcInvertNode>(node)) {
auto& invertNode = downcast<CSSCalcInvertNode>(node);
// If root is an Invert node, let s be a string initially containing "(1 / ".
builder.append("1 / ");
buildCSSTextRecursive(invertNode.child(), builder);
return;
}
}
void CSSCalcOperationNode::dump(TextStream& ts) const
{
ts << "calc operation " << m_operator << " (category: " << category() << ", type " << primitiveType() << ")";
TextStream::GroupScope scope(ts);
ts << m_children.size() << " children";
for (auto& child : m_children)
ts.dumpProperty("node", child);
}
bool CSSCalcOperationNode::equals(const CSSCalcExpressionNode& exp) const
{
if (type() != exp.type())
return false;
const CSSCalcOperationNode& other = static_cast<const CSSCalcOperationNode&>(exp);
if (m_children.size() != other.m_children.size() || m_operator != other.m_operator)
return false;
for (size_t i = 0; i < m_children.size(); ++i) {
if (!compareCSSValue(m_children[i], other.m_children[i]))
return false;
}
return true;
}
double CSSCalcOperationNode::evaluateOperator(CalcOperator op, const Vector<double>& children)
{
switch (op) {
case CalcOperator::Add: {
double sum = 0;
for (auto& child : children)
sum += child;
return sum;
}
case CalcOperator::Subtract:
ASSERT(children.size() == 2);
return children[0] - children[1];
case CalcOperator::Multiply: {
double product = 1;
for (auto& child : children)
product *= child;
return product;
}
case CalcOperator::Divide:
ASSERT(children.size() == 1 || children.size() == 2);
if (children.size() == 1)
return std::numeric_limits<double>::quiet_NaN();
return children[0] / children[1];
case CalcOperator::Min: {
if (children.isEmpty())
return std::numeric_limits<double>::quiet_NaN();
double minimum = children[0];
for (auto child : children)
minimum = std::min(minimum, child);
return minimum;
}
case CalcOperator::Max: {
if (children.isEmpty())
return std::numeric_limits<double>::quiet_NaN();
double maximum = children[0];
for (auto child : children)
maximum = std::max(maximum, child);
return maximum;
}
case CalcOperator::Clamp: {
if (children.size() != 3)
return std::numeric_limits<double>::quiet_NaN();
double min = children[0];
double value = children[1];
double max = children[2];
return std::max(min, std::min(value, max));
}
}
ASSERT_NOT_REACHED();
return 0;
}
class CSSCalcExpressionNodeParser {
public:
explicit CSSCalcExpressionNodeParser(CalculationCategory destinationCategory)
: m_destinationCategory(destinationCategory)
{ }
RefPtr<CSSCalcExpressionNode> parseCalc(CSSParserTokenRange, CSSValueID function);
private:
char operatorValue(const CSSParserToken& token)
{
if (token.type() == DelimiterToken)
return token.delimiter();
return 0;
}
bool parseValue(CSSParserTokenRange&, RefPtr<CSSCalcExpressionNode>&);
bool parseValueTerm(CSSParserTokenRange&, int depth, RefPtr<CSSCalcExpressionNode>&);
bool parseCalcFunction(CSSParserTokenRange&, CSSValueID, int depth, RefPtr<CSSCalcExpressionNode>&);
bool parseCalcSum(CSSParserTokenRange&, int depth, RefPtr<CSSCalcExpressionNode>&);
bool parseCalcProduct(CSSParserTokenRange&, int depth, RefPtr<CSSCalcExpressionNode>&);
bool parseCalcValue(CSSParserTokenRange&, int depth, RefPtr<CSSCalcExpressionNode>&);
CalculationCategory m_destinationCategory;
};
// <https://drafts.csswg.org/css-values-4/#calc-syntax>:
// <calc()> = calc( <calc-sum> )
// <min()> = min( <calc-sum># )
// <max()> = max( <calc-sum># )
// <clamp()> = clamp( <calc-sum>#{3} )
// <sin()> = sin( <calc-sum> )
// <cos()> = cos( <calc-sum> )
// <tan()> = tan( <calc-sum> )
// <asin()> = asin( <calc-sum> )
// <acos()> = acos( <calc-sum> )
// <atan()> = atan( <calc-sum> )
// <atan2()> = atan2( <calc-sum>, <calc-sum> )
// <pow()> = pow( <calc-sum>, <calc-sum> )
// <sqrt()> = sqrt( <calc-sum> )
// <hypot()> = hypot( <calc-sum># )
// <calc-sum> = <calc-product> [ [ '+' | '-' ] <calc-product> ]*
// <calc-product> = <calc-value> [ [ '*' | '/' ] <calc-value> ]*
// <calc-value> = <number> | <dimension> | <percentage> | ( <calc-sum> )
RefPtr<CSSCalcExpressionNode> CSSCalcExpressionNodeParser::parseCalc(CSSParserTokenRange tokens, CSSValueID function)
{
tokens.consumeWhitespace();
RefPtr<CSSCalcExpressionNode> result;
bool ok = parseCalcFunction(tokens, function, 0, result);
if (!ok || !tokens.atEnd())
return nullptr;
if (!result)
return nullptr;
LOG_WITH_STREAM(Calc, stream << "CSSCalcExpressionNodeParser::parseCalc " << prettyPrintNode(*result));
result = CSSCalcOperationNode::simplify(result.releaseNonNull());
LOG_WITH_STREAM(Calc, stream << "CSSCalcExpressionNodeParser::parseCalc - after simplification " << prettyPrintNode(*result));
return result;
}
enum ParseState {
OK,
TooDeep,
NoMoreTokens
};
static ParseState checkDepthAndIndex(int depth, CSSParserTokenRange tokens)
{
if (tokens.atEnd())
return NoMoreTokens;
if (depth > maxExpressionDepth) {
LOG_WITH_STREAM(Calc, stream << "Depth " << depth << " exceeded maxExpressionDepth " << maxExpressionDepth);
return TooDeep;
}
return OK;
}
bool CSSCalcExpressionNodeParser::parseCalcFunction(CSSParserTokenRange& tokens, CSSValueID functionID, int depth, RefPtr<CSSCalcExpressionNode>& result)
{
if (checkDepthAndIndex(depth, tokens) != OK)
return false;
// "arguments" refers to things between commas.
unsigned minArgumentCount = 1;
Optional<unsigned> maxArgumentCount;
switch (functionID) {
case CSSValueMin:
case CSSValueMax:
maxArgumentCount = WTF::nullopt;
break;
case CSSValueClamp:
minArgumentCount = 3;
maxArgumentCount = 3;
break;
case CSSValueCalc:
maxArgumentCount = 1;
break;
// TODO: clamp, sin, cos, tan, asin, acos, atan, atan2, pow, sqrt, hypot.
default:
break;
}
Vector<Ref<CSSCalcExpressionNode>> nodes;
bool requireComma = false;
unsigned argumentCount = 0;
while (!tokens.atEnd()) {
tokens.consumeWhitespace();
if (requireComma) {
if (tokens.consume().type() != CommaToken)
return false;
tokens.consumeWhitespace();
}
RefPtr<CSSCalcExpressionNode> node;
if (!parseCalcSum(tokens, depth, node))
return false;
++argumentCount;
if (maxArgumentCount && argumentCount > maxArgumentCount.value())
return false;
nodes.append(node.releaseNonNull());
requireComma = true;
}
if (argumentCount < minArgumentCount)
return false;
switch (functionID) {
case CSSValueMin:
result = CSSCalcOperationNode::createMinOrMaxOrClamp(CalcOperator::Min, WTFMove(nodes), m_destinationCategory);
break;
case CSSValueMax:
result = CSSCalcOperationNode::createMinOrMaxOrClamp(CalcOperator::Max, WTFMove(nodes), m_destinationCategory);
break;
case CSSValueClamp:
result = CSSCalcOperationNode::createMinOrMaxOrClamp(CalcOperator::Clamp, WTFMove(nodes), m_destinationCategory);
break;
case CSSValueWebkitCalc:
case CSSValueCalc:
result = CSSCalcOperationNode::createSum(WTFMove(nodes));
break;
// TODO: clamp, sin, cos, tan, asin, acos, atan, atan2, pow, sqrt, hypot
default:
break;
}
return !!result;
}
bool CSSCalcExpressionNodeParser::parseValue(CSSParserTokenRange& tokens, RefPtr<CSSCalcExpressionNode>& result)
{
CSSParserToken token = tokens.consumeIncludingWhitespace();
if (!(token.type() == NumberToken || token.type() == PercentageToken || token.type() == DimensionToken))
return false;
auto type = token.unitType();
if (calcUnitCategory(type) == CalculationCategory::Other)
return false;
result = CSSCalcPrimitiveValueNode::create(CSSPrimitiveValue::create(token.numericValue(), type));
return true;
}
bool CSSCalcExpressionNodeParser::parseCalcValue(CSSParserTokenRange& tokens, int depth, RefPtr<CSSCalcExpressionNode>& result)
{
if (checkDepthAndIndex(depth, tokens) != OK)
return false;
auto findFunctionId = [&](CSSValueID& functionId) {
if (tokens.peek().type() == LeftParenthesisToken) {
functionId = CSSValueCalc;
return true;
}
functionId = tokens.peek().functionId();
return CSSCalcValue::isCalcFunction(functionId);
};
CSSValueID functionId;
if (findFunctionId(functionId)) {
CSSParserTokenRange innerRange = tokens.consumeBlock();
tokens.consumeWhitespace();
innerRange.consumeWhitespace();
return parseCalcFunction(innerRange, functionId, depth + 1, result);
}
return parseValue(tokens, result);
}
bool CSSCalcExpressionNodeParser::parseCalcProduct(CSSParserTokenRange& tokens, int depth, RefPtr<CSSCalcExpressionNode>& result)
{
if (checkDepthAndIndex(depth, tokens) != OK)
return false;
RefPtr<CSSCalcExpressionNode> firstValue;
if (!parseCalcValue(tokens, depth, firstValue))
return false;
Vector<Ref<CSSCalcExpressionNode>> nodes;
while (!tokens.atEnd()) {
char operatorCharacter = operatorValue(tokens.peek());
if (operatorCharacter != static_cast<char>(CalcOperator::Multiply) && operatorCharacter != static_cast<char>(CalcOperator::Divide))
break;
tokens.consumeIncludingWhitespace();
RefPtr<CSSCalcExpressionNode> nextValue;
if (!parseCalcValue(tokens, depth, nextValue) || !nextValue)
return false;
if (operatorCharacter == static_cast<char>(CalcOperator::Divide))
nextValue = CSSCalcInvertNode::create(nextValue.releaseNonNull());
if (firstValue)
nodes.append(firstValue.releaseNonNull());
nodes.append(nextValue.releaseNonNull());
}
if (nodes.isEmpty()) {
result = WTFMove(firstValue);
return !!result;
}
result = CSSCalcOperationNode::createProduct(WTFMove(nodes));
return !!result;
}
bool CSSCalcExpressionNodeParser::parseCalcSum(CSSParserTokenRange& tokens, int depth, RefPtr<CSSCalcExpressionNode>& result)
{
if (checkDepthAndIndex(depth, tokens) != OK)
return false;
RefPtr<CSSCalcExpressionNode> firstValue;
if (!parseCalcProduct(tokens, depth, firstValue))
return false;
Vector<Ref<CSSCalcExpressionNode>> nodes;
while (!tokens.atEnd()) {
char operatorCharacter = operatorValue(tokens.peek());
if (operatorCharacter != static_cast<char>(CalcOperator::Add) && operatorCharacter != static_cast<char>(CalcOperator::Subtract))
break;
if ((&tokens.peek() - 1)->type() != WhitespaceToken)
return false; // calc(1px+ 2px) is invalid
tokens.consume();
if (tokens.peek().type() != WhitespaceToken)
return false; // calc(1px +2px) is invalid
tokens.consumeIncludingWhitespace();
RefPtr<CSSCalcExpressionNode> nextValue;
if (!parseCalcProduct(tokens, depth, nextValue) || !nextValue)
return false;
if (operatorCharacter == static_cast<char>(CalcOperator::Subtract))
nextValue = CSSCalcNegateNode::create(nextValue.releaseNonNull());
if (firstValue)
nodes.append(firstValue.releaseNonNull());
nodes.append(nextValue.releaseNonNull());
}
if (nodes.isEmpty()) {
result = WTFMove(firstValue);
return !!result;
}
result = CSSCalcOperationNode::createSum(WTFMove(nodes));
return !!result;
}
static inline RefPtr<CSSCalcOperationNode> createBlendHalf(const Length& length, const RenderStyle& style, float progress)
{
return CSSCalcOperationNode::create(CalcOperator::Multiply, createCSS(length, style),
CSSCalcPrimitiveValueNode::create(CSSPrimitiveValue::create(progress, CSSUnitType::CSS_NUMBER)));
}
static Vector<Ref<CSSCalcExpressionNode>> createCSS(const Vector<std::unique_ptr<CalcExpressionNode>>& nodes, const RenderStyle& style)
{
Vector<Ref<CSSCalcExpressionNode>> values;
values.reserveInitialCapacity(nodes.size());
for (auto& node : nodes) {
auto cssNode = createCSS(*node, style);
if (!cssNode)
return { };
values.uncheckedAppend(cssNode.releaseNonNull());
}
return values;
}
static RefPtr<CSSCalcExpressionNode> createCSS(const CalcExpressionNode& node, const RenderStyle& style)
{
switch (node.type()) {
case CalcExpressionNodeType::Number: {
float value = downcast<CalcExpressionNumber>(node).value(); // double?
return CSSCalcPrimitiveValueNode::create(CSSPrimitiveValue::create(value, CSSUnitType::CSS_NUMBER));
}
case CalcExpressionNodeType::Length:
return createCSS(downcast<CalcExpressionLength>(node).length(), style);
case CalcExpressionNodeType::Negation: {
auto childNode = createCSS(*downcast<CalcExpressionNegation>(node).child(), style);
if (!childNode)
return nullptr;
return CSSCalcNegateNode::create(childNode.releaseNonNull());
}
case CalcExpressionNodeType::Inversion: {
auto childNode = createCSS(*downcast<CalcExpressionInversion>(node).child(), style);
if (!childNode)
return nullptr;
return CSSCalcInvertNode::create(childNode.releaseNonNull());
}
case CalcExpressionNodeType::Operation: {
auto& operationNode = downcast<CalcExpressionOperation>(node);
auto& operationChildren = operationNode.children();
CalcOperator op = operationNode.getOperator();
switch (op) {
case CalcOperator::Add: {
auto children = createCSS(operationChildren, style);
if (children.isEmpty())
return nullptr;
return CSSCalcOperationNode::createSum(WTFMove(children));
} case CalcOperator::Subtract: {
ASSERT(operationChildren.size() == 2);
Vector<Ref<CSSCalcExpressionNode>> values;
values.reserveInitialCapacity(operationChildren.size());
auto firstChild = createCSS(*operationChildren[0], style);
if (!firstChild)
return nullptr;
auto secondChild = createCSS(*operationChildren[1], style);
if (!secondChild)
return nullptr;
auto negateNode = CSSCalcNegateNode::create(secondChild.releaseNonNull());
values.append(firstChild.releaseNonNull());
values.append(WTFMove(negateNode));
return CSSCalcOperationNode::createSum(WTFMove(values));
}
case CalcOperator::Multiply: {
auto children = createCSS(operationChildren, style);
if (children.isEmpty())
return nullptr;
return CSSCalcOperationNode::createProduct(WTFMove(children));
}
case CalcOperator::Divide: {
ASSERT(operationChildren.size() == 2);
Vector<Ref<CSSCalcExpressionNode>> values;
values.reserveInitialCapacity(operationChildren.size());
auto firstChild = createCSS(*operationChildren[0], style);
if (!firstChild)
return nullptr;
auto secondChild = createCSS(*operationChildren[1], style);
if (!secondChild)
return nullptr;
auto invertNode = CSSCalcInvertNode::create(secondChild.releaseNonNull());
values.append(firstChild.releaseNonNull());
values.append(WTFMove(invertNode));
return CSSCalcOperationNode::createProduct(createCSS(operationChildren, style));
}
case CalcOperator::Min:
case CalcOperator::Max:
case CalcOperator::Clamp: {
auto children = createCSS(operationChildren, style);
if (children.isEmpty())
return nullptr;
return CSSCalcOperationNode::createMinOrMaxOrClamp(op, WTFMove(children), CalculationCategory::Other);
}
}
return nullptr;
}
case CalcExpressionNodeType::BlendLength: {
// FIXME: (http://webkit.org/b/122036) Create a CSSCalcExpressionNode equivalent of CalcExpressionBlendLength.
auto& blend = downcast<CalcExpressionBlendLength>(node);
float progress = blend.progress();
return CSSCalcOperationNode::create(CalcOperator::Add, createBlendHalf(blend.from(), style, 1 - progress), createBlendHalf(blend.to(), style, progress));
}
case CalcExpressionNodeType::Undefined:
ASSERT_NOT_REACHED();
}
return nullptr;
}
static RefPtr<CSSCalcExpressionNode> createCSS(const Length& length, const RenderStyle& style)
{
switch (length.type()) {
case Percent:
case Fixed:
return CSSCalcPrimitiveValueNode::create(CSSPrimitiveValue::create(length, style));
case Calculated:
return createCSS(length.calculationValue().expression(), style);
case Auto:
case Intrinsic:
case MinIntrinsic:
case MinContent:
case MaxContent:
case FillAvailable:
case FitContent:
case Relative:
case Undefined:
ASSERT_NOT_REACHED();
}
return nullptr;
}
String CSSCalcValue::customCSSText() const
{
StringBuilder builder;
CSSCalcOperationNode::buildCSSText(m_expression.get(), builder);
return builder.toString();
}
bool CSSCalcValue::equals(const CSSCalcValue& other) const
{
return compareCSSValue(m_expression, other.m_expression);
}
inline double CSSCalcValue::clampToPermittedRange(double value) const
{
return m_shouldClampToNonNegative && value < 0 ? 0 : value;
}
double CSSCalcValue::doubleValue() const
{
return clampToPermittedRange(m_expression->doubleValue(primitiveType()));
}
double CSSCalcValue::computeLengthPx(const CSSToLengthConversionData& conversionData) const
{
return clampToPermittedRange(m_expression->computeLengthPx(conversionData));
}
bool CSSCalcValue::isCalcFunction(CSSValueID functionId)
{
switch (functionId) {
case CSSValueCalc:
case CSSValueWebkitCalc:
case CSSValueMin:
case CSSValueMax:
case CSSValueClamp:
return true;
default:
return false;
}
return false;
}
void CSSCalcValue::dump(TextStream& ts) const
{
ts << indent << "(" << "CSSCalcValue";
TextStream multilineStream;
multilineStream.setIndent(ts.indent() + 2);
multilineStream.dumpProperty("should clamp non-negative", m_shouldClampToNonNegative);
multilineStream.dumpProperty("expression", m_expression.get());
ts << multilineStream.release();
ts << ")\n";
}
RefPtr<CSSCalcValue> CSSCalcValue::create(CSSValueID function, const CSSParserTokenRange& tokens, CalculationCategory destinationCategory, ValueRange range)
{
CSSCalcExpressionNodeParser parser(destinationCategory);
auto expression = parser.parseCalc(tokens, function);
if (!expression)
return nullptr;
auto result = adoptRef(new CSSCalcValue(expression.releaseNonNull(), range != ValueRangeAll));
LOG_WITH_STREAM(Calc, stream << "CSSCalcValue::create " << *result);
return result;
}
RefPtr<CSSCalcValue> CSSCalcValue::create(const CalculationValue& value, const RenderStyle& style)
{
auto expression = createCSS(value.expression(), style);
if (!expression)
return nullptr;
auto result = adoptRef(new CSSCalcValue(expression.releaseNonNull(), value.shouldClampToNonNegative()));
LOG_WITH_STREAM(Calc, stream << "CSSCalcValue::create from CalculationValue: " << *result);
return result;
}
TextStream& operator<<(TextStream& ts, CalculationCategory category)
{
switch (category) {
case CalculationCategory::Number: ts << "number"; break;
case CalculationCategory::Length: ts << "length"; break;
case CalculationCategory::Percent: ts << "percent"; break;
case CalculationCategory::PercentNumber: ts << "percent-number"; break;
case CalculationCategory::PercentLength: ts << "percent-length"; break;
case CalculationCategory::Angle: ts << "angle"; break;
case CalculationCategory::Time: ts << "time"; break;
case CalculationCategory::Frequency: ts << "frequency"; break;
case CalculationCategory::Other: ts << "other"; break;
}
return ts;
}
TextStream& operator<<(TextStream& ts, const CSSCalcValue& value)
{
value.dump(ts);
return ts;
}
} // namespace WebCore