| /* |
| * Copyright (C) 2011, 2012 Google 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 "core/css/CSSCalculationValue.h" |
| |
| #include "core/css/CSSPrimitiveValueMappings.h" |
| #include "core/css/resolver/StyleResolver.h" |
| #include "wtf/MathExtras.h" |
| #include "wtf/OwnPtr.h" |
| #include "wtf/text/StringBuilder.h" |
| |
| static const int maxExpressionDepth = 100; |
| |
| enum ParseState { |
| OK, |
| TooDeep, |
| NoMoreTokens |
| }; |
| |
| namespace blink { |
| |
| static CalculationCategory unitCategory(CSSPrimitiveValue::UnitType type) |
| { |
| switch (type) { |
| case CSSPrimitiveValue::UnitType::Number: |
| case CSSPrimitiveValue::UnitType::Integer: |
| return CalcNumber; |
| case CSSPrimitiveValue::UnitType::Percentage: |
| return CalcPercent; |
| case CSSPrimitiveValue::UnitType::Ems: |
| case CSSPrimitiveValue::UnitType::Exs: |
| case CSSPrimitiveValue::UnitType::Pixels: |
| case CSSPrimitiveValue::UnitType::Centimeters: |
| case CSSPrimitiveValue::UnitType::Millimeters: |
| case CSSPrimitiveValue::UnitType::Inches: |
| case CSSPrimitiveValue::UnitType::Points: |
| case CSSPrimitiveValue::UnitType::Picas: |
| case CSSPrimitiveValue::UnitType::Rems: |
| case CSSPrimitiveValue::UnitType::Chs: |
| case CSSPrimitiveValue::UnitType::ViewportWidth: |
| case CSSPrimitiveValue::UnitType::ViewportHeight: |
| case CSSPrimitiveValue::UnitType::ViewportMin: |
| case CSSPrimitiveValue::UnitType::ViewportMax: |
| return CalcLength; |
| case CSSPrimitiveValue::UnitType::Degrees: |
| case CSSPrimitiveValue::UnitType::Gradians: |
| case CSSPrimitiveValue::UnitType::Radians: |
| case CSSPrimitiveValue::UnitType::Turns: |
| return CalcAngle; |
| case CSSPrimitiveValue::UnitType::Milliseconds: |
| case CSSPrimitiveValue::UnitType::Seconds: |
| return CalcTime; |
| case CSSPrimitiveValue::UnitType::Hertz: |
| case CSSPrimitiveValue::UnitType::Kilohertz: |
| return CalcFrequency; |
| default: |
| return CalcOther; |
| } |
| } |
| |
| static bool hasDoubleValue(CSSPrimitiveValue::UnitType type) |
| { |
| switch (type) { |
| case CSSPrimitiveValue::UnitType::Number: |
| case CSSPrimitiveValue::UnitType::Percentage: |
| case CSSPrimitiveValue::UnitType::Ems: |
| case CSSPrimitiveValue::UnitType::Exs: |
| case CSSPrimitiveValue::UnitType::Chs: |
| case CSSPrimitiveValue::UnitType::Rems: |
| case CSSPrimitiveValue::UnitType::Pixels: |
| case CSSPrimitiveValue::UnitType::Centimeters: |
| case CSSPrimitiveValue::UnitType::Millimeters: |
| case CSSPrimitiveValue::UnitType::Inches: |
| case CSSPrimitiveValue::UnitType::Points: |
| case CSSPrimitiveValue::UnitType::Picas: |
| case CSSPrimitiveValue::UnitType::Degrees: |
| case CSSPrimitiveValue::UnitType::Radians: |
| case CSSPrimitiveValue::UnitType::Gradians: |
| case CSSPrimitiveValue::UnitType::Turns: |
| case CSSPrimitiveValue::UnitType::Milliseconds: |
| case CSSPrimitiveValue::UnitType::Seconds: |
| case CSSPrimitiveValue::UnitType::Hertz: |
| case CSSPrimitiveValue::UnitType::Kilohertz: |
| case CSSPrimitiveValue::UnitType::ViewportWidth: |
| case CSSPrimitiveValue::UnitType::ViewportHeight: |
| case CSSPrimitiveValue::UnitType::ViewportMin: |
| case CSSPrimitiveValue::UnitType::ViewportMax: |
| case CSSPrimitiveValue::UnitType::DotsPerPixel: |
| case CSSPrimitiveValue::UnitType::DotsPerInch: |
| case CSSPrimitiveValue::UnitType::DotsPerCentimeter: |
| case CSSPrimitiveValue::UnitType::Fraction: |
| case CSSPrimitiveValue::UnitType::Integer: |
| return true; |
| case CSSPrimitiveValue::UnitType::Unknown: |
| case CSSPrimitiveValue::UnitType::CustomIdentifier: |
| case CSSPrimitiveValue::UnitType::String: |
| case CSSPrimitiveValue::UnitType::URI: |
| case CSSPrimitiveValue::UnitType::RGBColor: |
| case CSSPrimitiveValue::UnitType::Shape: |
| case CSSPrimitiveValue::UnitType::Calc: |
| case CSSPrimitiveValue::UnitType::CalcPercentageWithNumber: |
| case CSSPrimitiveValue::UnitType::CalcPercentageWithLength: |
| case CSSPrimitiveValue::UnitType::PropertyID: |
| case CSSPrimitiveValue::UnitType::ValueID: |
| case CSSPrimitiveValue::UnitType::QuirkyEms: |
| return false; |
| }; |
| ASSERT_NOT_REACHED(); |
| return false; |
| } |
| |
| static String buildCSSText(const String& expression) |
| { |
| StringBuilder result; |
| result.appendLiteral("calc"); |
| bool expressionHasSingleTerm = expression[0] != '('; |
| if (expressionHasSingleTerm) |
| result.append('('); |
| result.append(expression); |
| if (expressionHasSingleTerm) |
| result.append(')'); |
| return result.toString(); |
| } |
| |
| String CSSCalcValue::customCSSText() const |
| { |
| return buildCSSText(m_expression->customCSSText()); |
| } |
| |
| bool CSSCalcValue::equals(const CSSCalcValue& other) const |
| { |
| return compareCSSValuePtr(m_expression, other.m_expression); |
| } |
| |
| double CSSCalcValue::clampToPermittedRange(double value) const |
| { |
| return m_nonNegative && value < 0 ? 0 : value; |
| } |
| |
| double CSSCalcValue::doubleValue() const |
| { |
| return clampToPermittedRange(m_expression->doubleValue()); |
| } |
| |
| double CSSCalcValue::computeLengthPx(const CSSToLengthConversionData& conversionData) const |
| { |
| return clampToPermittedRange(m_expression->computeLengthPx(conversionData)); |
| } |
| |
| DEFINE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(CSSCalcExpressionNode) |
| |
| class CSSCalcPrimitiveValue final : public CSSCalcExpressionNode { |
| WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED(CSSCalcPrimitiveValue); |
| public: |
| |
| static PassRefPtrWillBeRawPtr<CSSCalcPrimitiveValue> create(PassRefPtrWillBeRawPtr<CSSPrimitiveValue> value, bool isInteger) |
| { |
| return adoptRefWillBeNoop(new CSSCalcPrimitiveValue(value, isInteger)); |
| } |
| |
| static PassRefPtrWillBeRawPtr<CSSCalcPrimitiveValue> create(double value, CSSPrimitiveValue::UnitType type, bool isInteger) |
| { |
| if (std::isnan(value) || std::isinf(value)) |
| return nullptr; |
| return adoptRefWillBeNoop(new CSSCalcPrimitiveValue(CSSPrimitiveValue::create(value, type).get(), isInteger)); |
| } |
| |
| bool isZero() const override |
| { |
| return !m_value->getDoubleValue(); |
| } |
| |
| String customCSSText() const override |
| { |
| return m_value->cssText(); |
| } |
| |
| void accumulatePixelsAndPercent(const CSSToLengthConversionData& conversionData, PixelsAndPercent& value, float multiplier) const override |
| { |
| switch (m_category) { |
| case CalcLength: |
| value.pixels += m_value->computeLength<float>(conversionData) * multiplier; |
| break; |
| case CalcPercent: |
| ASSERT(m_value->isPercentage()); |
| value.percent += m_value->getDoubleValue() * multiplier; |
| break; |
| default: |
| ASSERT_NOT_REACHED(); |
| } |
| } |
| |
| double doubleValue() const override |
| { |
| if (hasDoubleValue(typeWithCalcResolved())) |
| return m_value->getDoubleValue(); |
| ASSERT_NOT_REACHED(); |
| return 0; |
| } |
| |
| double computeLengthPx(const CSSToLengthConversionData& conversionData) const override |
| { |
| switch (m_category) { |
| case CalcLength: |
| return m_value->computeLength<double>(conversionData); |
| case CalcNumber: |
| case CalcPercent: |
| return m_value->getDoubleValue(); |
| case CalcAngle: |
| case CalcFrequency: |
| case CalcPercentLength: |
| case CalcPercentNumber: |
| case CalcTime: |
| case CalcOther: |
| ASSERT_NOT_REACHED(); |
| break; |
| } |
| ASSERT_NOT_REACHED(); |
| return 0; |
| } |
| |
| void accumulateLengthArray(CSSLengthArray& lengthArray, CSSLengthTypeArray& lengthTypeArray, double multiplier) const override |
| { |
| ASSERT(category() != CalcNumber); |
| m_value->accumulateLengthArray(lengthArray, lengthTypeArray, multiplier); |
| } |
| |
| bool equals(const CSSCalcExpressionNode& other) const override |
| { |
| if (type() != other.type()) |
| return false; |
| |
| return compareCSSValuePtr(m_value, static_cast<const CSSCalcPrimitiveValue&>(other).m_value); |
| } |
| |
| Type type() const override { return CssCalcPrimitiveValue; } |
| CSSPrimitiveValue::UnitType typeWithCalcResolved() const override |
| { |
| return m_value->typeWithCalcResolved(); |
| } |
| |
| |
| DEFINE_INLINE_VIRTUAL_TRACE() |
| { |
| visitor->trace(m_value); |
| CSSCalcExpressionNode::trace(visitor); |
| } |
| |
| private: |
| CSSCalcPrimitiveValue(PassRefPtrWillBeRawPtr<CSSPrimitiveValue> value, bool isInteger) |
| : CSSCalcExpressionNode(unitCategory(value->typeWithCalcResolved()), isInteger) |
| , m_value(value) |
| { |
| } |
| |
| RefPtrWillBeMember<CSSPrimitiveValue> m_value; |
| }; |
| |
| static const CalculationCategory addSubtractResult[CalcOther][CalcOther] = { |
| // CalcNumber CalcLength CalcPercent CalcPercentNumber CalcPercentLength CalcAngle CalcTime CalcFrequency |
| /* CalcNumber */ { CalcNumber, CalcOther, CalcPercentNumber, CalcPercentNumber, CalcOther, CalcOther, CalcOther, CalcOther }, |
| /* CalcLength */ { CalcOther, CalcLength, CalcPercentLength, CalcOther, CalcPercentLength, CalcOther, CalcOther, CalcOther }, |
| /* CalcPercent */ { CalcPercentNumber, CalcPercentLength, CalcPercent, CalcPercentNumber, CalcPercentLength, CalcOther, CalcOther, CalcOther }, |
| /* CalcPercentNumber */ { CalcPercentNumber, CalcOther, CalcPercentNumber, CalcPercentNumber, CalcOther, CalcOther, CalcOther, CalcOther }, |
| /* CalcPercentLength */ { CalcOther, CalcPercentLength, CalcPercentLength, CalcOther, CalcPercentLength, CalcOther, CalcOther, CalcOther }, |
| /* CalcAngle */ { CalcOther, CalcOther, CalcOther, CalcOther, CalcOther, CalcAngle, CalcOther, CalcOther }, |
| /* CalcTime */ { CalcOther, CalcOther, CalcOther, CalcOther, CalcOther, CalcOther, CalcTime, CalcOther }, |
| /* CalcFrequency */ { CalcOther, CalcOther, CalcOther, CalcOther, CalcOther, CalcOther, CalcOther, CalcFrequency } |
| }; |
| |
| static CalculationCategory determineCategory(const CSSCalcExpressionNode& leftSide, const CSSCalcExpressionNode& rightSide, CalcOperator op) |
| { |
| CalculationCategory leftCategory = leftSide.category(); |
| CalculationCategory rightCategory = rightSide.category(); |
| |
| if (leftCategory == CalcOther || rightCategory == CalcOther) |
| return CalcOther; |
| |
| switch (op) { |
| case CalcAdd: |
| case CalcSubtract: |
| return addSubtractResult[leftCategory][rightCategory]; |
| case CalcMultiply: |
| if (leftCategory != CalcNumber && rightCategory != CalcNumber) |
| return CalcOther; |
| return leftCategory == CalcNumber ? rightCategory : leftCategory; |
| case CalcDivide: |
| if (rightCategory != CalcNumber || rightSide.isZero()) |
| return CalcOther; |
| return leftCategory; |
| } |
| |
| ASSERT_NOT_REACHED(); |
| return CalcOther; |
| } |
| |
| static bool isIntegerResult(const CSSCalcExpressionNode* leftSide, const CSSCalcExpressionNode* rightSide, CalcOperator op) |
| { |
| // Not testing for actual integer values. |
| // Performs W3C spec's type checking for calc integers. |
| // http://www.w3.org/TR/css3-values/#calc-type-checking |
| return op != CalcDivide && leftSide->isInteger() && rightSide->isInteger(); |
| } |
| |
| class CSSCalcBinaryOperation final : public CSSCalcExpressionNode { |
| public: |
| static PassRefPtrWillBeRawPtr<CSSCalcExpressionNode> create(PassRefPtrWillBeRawPtr<CSSCalcExpressionNode> leftSide, PassRefPtrWillBeRawPtr<CSSCalcExpressionNode> rightSide, CalcOperator op) |
| { |
| ASSERT(leftSide->category() != CalcOther && rightSide->category() != CalcOther); |
| |
| CalculationCategory newCategory = determineCategory(*leftSide, *rightSide, op); |
| if (newCategory == CalcOther) |
| return nullptr; |
| |
| return adoptRefWillBeNoop(new CSSCalcBinaryOperation(leftSide, rightSide, op, newCategory)); |
| } |
| |
| static PassRefPtrWillBeRawPtr<CSSCalcExpressionNode> createSimplified(PassRefPtrWillBeRawPtr<CSSCalcExpressionNode> leftSide, PassRefPtrWillBeRawPtr<CSSCalcExpressionNode> rightSide, CalcOperator op) |
| { |
| CalculationCategory leftCategory = leftSide->category(); |
| CalculationCategory rightCategory = rightSide->category(); |
| ASSERT(leftCategory != CalcOther && rightCategory != CalcOther); |
| |
| bool isInteger = isIntegerResult(leftSide.get(), rightSide.get(), op); |
| |
| // Simplify numbers. |
| if (leftCategory == CalcNumber && rightCategory == CalcNumber) { |
| return CSSCalcPrimitiveValue::create(evaluateOperator(leftSide->doubleValue(), rightSide->doubleValue(), op), CSSPrimitiveValue::UnitType::Number, isInteger); |
| } |
| |
| // Simplify addition and subtraction between same types. |
| if (op == CalcAdd || op == CalcSubtract) { |
| if (leftCategory == rightSide->category()) { |
| CSSPrimitiveValue::UnitType leftType = leftSide->typeWithCalcResolved(); |
| if (hasDoubleValue(leftType)) { |
| CSSPrimitiveValue::UnitType rightType = rightSide->typeWithCalcResolved(); |
| if (leftType == rightType) |
| return CSSCalcPrimitiveValue::create(evaluateOperator(leftSide->doubleValue(), rightSide->doubleValue(), op), leftType, isInteger); |
| CSSPrimitiveValue::UnitCategory leftUnitCategory = CSSPrimitiveValue::unitCategory(leftType); |
| if (leftUnitCategory != CSSPrimitiveValue::UOther && leftUnitCategory == CSSPrimitiveValue::unitCategory(rightType)) { |
| CSSPrimitiveValue::UnitType canonicalType = CSSPrimitiveValue::canonicalUnitTypeForCategory(leftUnitCategory); |
| if (canonicalType != CSSPrimitiveValue::UnitType::Unknown) { |
| double leftValue = leftSide->doubleValue() * CSSPrimitiveValue::conversionToCanonicalUnitsScaleFactor(leftType); |
| double rightValue = rightSide->doubleValue() * CSSPrimitiveValue::conversionToCanonicalUnitsScaleFactor(rightType); |
| return CSSCalcPrimitiveValue::create(evaluateOperator(leftValue, rightValue, op), canonicalType, isInteger); |
| } |
| } |
| } |
| } |
| } else { |
| // Simplify multiplying or dividing by a number for simplifiable types. |
| ASSERT(op == CalcMultiply || op == CalcDivide); |
| CSSCalcExpressionNode* numberSide = getNumberSide(leftSide.get(), rightSide.get()); |
| if (!numberSide) |
| return create(leftSide, rightSide, op); |
| if (numberSide == leftSide && op == CalcDivide) |
| return nullptr; |
| CSSCalcExpressionNode* otherSide = leftSide == numberSide ? rightSide.get() : leftSide.get(); |
| |
| double number = numberSide->doubleValue(); |
| if (std::isnan(number) || std::isinf(number)) |
| return nullptr; |
| if (op == CalcDivide && !number) |
| return nullptr; |
| |
| CSSPrimitiveValue::UnitType otherType = otherSide->typeWithCalcResolved(); |
| if (hasDoubleValue(otherType)) |
| return CSSCalcPrimitiveValue::create(evaluateOperator(otherSide->doubleValue(), number, op), otherType, isInteger); |
| } |
| |
| return create(leftSide, rightSide, op); |
| } |
| |
| bool isZero() const override |
| { |
| return !doubleValue(); |
| } |
| |
| void accumulatePixelsAndPercent(const CSSToLengthConversionData& conversionData, PixelsAndPercent& value, float multiplier) const override |
| { |
| switch (m_operator) { |
| case CalcAdd: |
| m_leftSide->accumulatePixelsAndPercent(conversionData, value, multiplier); |
| m_rightSide->accumulatePixelsAndPercent(conversionData, value, multiplier); |
| break; |
| case CalcSubtract: |
| m_leftSide->accumulatePixelsAndPercent(conversionData, value, multiplier); |
| m_rightSide->accumulatePixelsAndPercent(conversionData, value, -multiplier); |
| break; |
| case CalcMultiply: |
| ASSERT((m_leftSide->category() == CalcNumber) != (m_rightSide->category() == CalcNumber)); |
| if (m_leftSide->category() == CalcNumber) |
| m_rightSide->accumulatePixelsAndPercent(conversionData, value, multiplier * m_leftSide->doubleValue()); |
| else |
| m_leftSide->accumulatePixelsAndPercent(conversionData, value, multiplier * m_rightSide->doubleValue()); |
| break; |
| case CalcDivide: |
| ASSERT(m_rightSide->category() == CalcNumber); |
| m_leftSide->accumulatePixelsAndPercent(conversionData, value, multiplier / m_rightSide->doubleValue()); |
| break; |
| default: |
| ASSERT_NOT_REACHED(); |
| } |
| } |
| |
| double doubleValue() const override |
| { |
| return evaluate(m_leftSide->doubleValue(), m_rightSide->doubleValue()); |
| } |
| |
| double computeLengthPx(const CSSToLengthConversionData& conversionData) const override |
| { |
| const double leftValue = m_leftSide->computeLengthPx(conversionData); |
| const double rightValue = m_rightSide->computeLengthPx(conversionData); |
| return evaluate(leftValue, rightValue); |
| } |
| |
| void accumulateLengthArray(CSSLengthArray& lengthArray, CSSLengthTypeArray& lengthTypeArray, double multiplier) const override |
| { |
| switch (m_operator) { |
| case CalcAdd: |
| m_leftSide->accumulateLengthArray(lengthArray, lengthTypeArray, multiplier); |
| m_rightSide->accumulateLengthArray(lengthArray, lengthTypeArray, multiplier); |
| break; |
| case CalcSubtract: |
| m_leftSide->accumulateLengthArray(lengthArray, lengthTypeArray, multiplier); |
| m_rightSide->accumulateLengthArray(lengthArray, lengthTypeArray, -multiplier); |
| break; |
| case CalcMultiply: |
| ASSERT((m_leftSide->category() == CalcNumber) != (m_rightSide->category() == CalcNumber)); |
| if (m_leftSide->category() == CalcNumber) |
| m_rightSide->accumulateLengthArray(lengthArray, lengthTypeArray, multiplier * m_leftSide->doubleValue()); |
| else |
| m_leftSide->accumulateLengthArray(lengthArray, lengthTypeArray, multiplier * m_rightSide->doubleValue()); |
| break; |
| case CalcDivide: |
| ASSERT(m_rightSide->category() == CalcNumber); |
| m_leftSide->accumulateLengthArray(lengthArray, lengthTypeArray, multiplier / m_rightSide->doubleValue()); |
| break; |
| default: |
| ASSERT_NOT_REACHED(); |
| } |
| } |
| |
| static String buildCSSText(const String& leftExpression, const String& rightExpression, CalcOperator op) |
| { |
| StringBuilder result; |
| result.append('('); |
| result.append(leftExpression); |
| result.append(' '); |
| result.append(static_cast<char>(op)); |
| result.append(' '); |
| result.append(rightExpression); |
| result.append(')'); |
| |
| return result.toString(); |
| } |
| |
| String customCSSText() const override |
| { |
| return buildCSSText(m_leftSide->customCSSText(), m_rightSide->customCSSText(), m_operator); |
| } |
| |
| bool equals(const CSSCalcExpressionNode& exp) const override |
| { |
| if (type() != exp.type()) |
| return false; |
| |
| const CSSCalcBinaryOperation& other = static_cast<const CSSCalcBinaryOperation&>(exp); |
| return compareCSSValuePtr(m_leftSide, other.m_leftSide) |
| && compareCSSValuePtr(m_rightSide, other.m_rightSide) |
| && m_operator == other.m_operator; |
| } |
| |
| Type type() const override { return CssCalcBinaryOperation; } |
| |
| CSSPrimitiveValue::UnitType typeWithCalcResolved() const override |
| { |
| switch (m_category) { |
| case CalcNumber: |
| ASSERT(m_leftSide->category() == CalcNumber && m_rightSide->category() == CalcNumber); |
| return CSSPrimitiveValue::UnitType::Number; |
| case CalcLength: |
| case CalcPercent: { |
| if (m_leftSide->category() == CalcNumber) |
| return m_rightSide->typeWithCalcResolved(); |
| if (m_rightSide->category() == CalcNumber) |
| return m_leftSide->typeWithCalcResolved(); |
| CSSPrimitiveValue::UnitType leftType = m_leftSide->typeWithCalcResolved(); |
| if (leftType == m_rightSide->typeWithCalcResolved()) |
| return leftType; |
| return CSSPrimitiveValue::UnitType::Unknown; |
| } |
| case CalcAngle: |
| return CSSPrimitiveValue::UnitType::Degrees; |
| case CalcTime: |
| return CSSPrimitiveValue::UnitType::Milliseconds; |
| case CalcFrequency: |
| return CSSPrimitiveValue::UnitType::Hertz; |
| case CalcPercentLength: |
| case CalcPercentNumber: |
| case CalcOther: |
| return CSSPrimitiveValue::UnitType::Unknown; |
| } |
| ASSERT_NOT_REACHED(); |
| return CSSPrimitiveValue::UnitType::Unknown; |
| } |
| |
| DEFINE_INLINE_VIRTUAL_TRACE() |
| { |
| visitor->trace(m_leftSide); |
| visitor->trace(m_rightSide); |
| CSSCalcExpressionNode::trace(visitor); |
| } |
| |
| private: |
| CSSCalcBinaryOperation(PassRefPtrWillBeRawPtr<CSSCalcExpressionNode> leftSide, PassRefPtrWillBeRawPtr<CSSCalcExpressionNode> rightSide, CalcOperator op, CalculationCategory category) |
| : CSSCalcExpressionNode(category, isIntegerResult(leftSide.get(), rightSide.get(), op)) |
| , m_leftSide(leftSide) |
| , m_rightSide(rightSide) |
| , m_operator(op) |
| { |
| } |
| |
| static CSSCalcExpressionNode* getNumberSide(CSSCalcExpressionNode* leftSide, CSSCalcExpressionNode* rightSide) |
| { |
| if (leftSide->category() == CalcNumber) |
| return leftSide; |
| if (rightSide->category() == CalcNumber) |
| return rightSide; |
| return nullptr; |
| } |
| |
| double evaluate(double leftSide, double rightSide) const |
| { |
| return evaluateOperator(leftSide, rightSide, m_operator); |
| } |
| |
| static double evaluateOperator(double leftValue, double rightValue, CalcOperator op) |
| { |
| switch (op) { |
| case CalcAdd: |
| return leftValue + rightValue; |
| case CalcSubtract: |
| return leftValue - rightValue; |
| case CalcMultiply: |
| return leftValue * rightValue; |
| case CalcDivide: |
| if (rightValue) |
| return leftValue / rightValue; |
| return std::numeric_limits<double>::quiet_NaN(); |
| } |
| return 0; |
| } |
| |
| const RefPtrWillBeMember<CSSCalcExpressionNode> m_leftSide; |
| const RefPtrWillBeMember<CSSCalcExpressionNode> m_rightSide; |
| const CalcOperator m_operator; |
| }; |
| |
| static ParseState checkDepthAndIndex(int* depth, CSSParserTokenRange tokens) |
| { |
| (*depth)++; |
| if (tokens.atEnd()) |
| return NoMoreTokens; |
| if (*depth > maxExpressionDepth) |
| return TooDeep; |
| return OK; |
| } |
| |
| class CSSCalcExpressionNodeParser { |
| STACK_ALLOCATED(); |
| public: |
| PassRefPtrWillBeRawPtr<CSSCalcExpressionNode> parseCalc(CSSParserTokenRange tokens) |
| { |
| Value result; |
| tokens.consumeWhitespace(); |
| bool ok = parseValueExpression(tokens, 0, &result); |
| if (!ok || !tokens.atEnd()) |
| return nullptr; |
| return result.value; |
| } |
| |
| private: |
| struct Value { |
| STACK_ALLOCATED(); |
| public: |
| RefPtrWillBeMember<CSSCalcExpressionNode> value; |
| }; |
| |
| char operatorValue(const CSSParserToken& token) |
| { |
| if (token.type() == DelimiterToken) |
| return token.delimiter(); |
| return 0; |
| } |
| |
| bool parseValue(CSSParserTokenRange& tokens, Value* result) |
| { |
| CSSParserToken token = tokens.consumeIncludingWhitespace(); |
| if (!(token.type() == NumberToken || token.type() == PercentageToken || token.type() == DimensionToken)) |
| return false; |
| |
| CSSPrimitiveValue::UnitType type = token.unitType(); |
| if (unitCategory(type) == CalcOther) |
| return false; |
| |
| result->value = CSSCalcPrimitiveValue::create( |
| CSSPrimitiveValue::create(token.numericValue(), type), token.numericValueType() == IntegerValueType); |
| |
| return true; |
| } |
| |
| bool parseValueTerm(CSSParserTokenRange& tokens, int depth, Value* result) |
| { |
| if (checkDepthAndIndex(&depth, tokens) != OK) |
| return false; |
| |
| if (tokens.peek().type() == LeftParenthesisToken) { |
| CSSParserTokenRange innerRange = tokens.consumeBlock(); |
| tokens.consumeWhitespace(); |
| return parseValueExpression(innerRange, depth, result); |
| } |
| |
| return parseValue(tokens, result); |
| } |
| |
| bool parseValueMultiplicativeExpression(CSSParserTokenRange& tokens, int depth, Value* result) |
| { |
| if (checkDepthAndIndex(&depth, tokens) != OK) |
| return false; |
| |
| if (!parseValueTerm(tokens, depth, result)) |
| return false; |
| |
| while (!tokens.atEnd()) { |
| char operatorCharacter = operatorValue(tokens.peek()); |
| if (operatorCharacter != CalcMultiply && operatorCharacter != CalcDivide) |
| break; |
| tokens.consumeIncludingWhitespace(); |
| |
| Value rhs; |
| if (!parseValueTerm(tokens, depth, &rhs)) |
| return false; |
| |
| result->value = CSSCalcBinaryOperation::createSimplified(result->value, rhs.value, static_cast<CalcOperator>(operatorCharacter)); |
| if (!result->value) |
| return false; |
| } |
| |
| return true; |
| } |
| |
| bool parseAdditiveValueExpression(CSSParserTokenRange& tokens, int depth, Value* result) |
| { |
| if (checkDepthAndIndex(&depth, tokens) != OK) |
| return false; |
| |
| if (!parseValueMultiplicativeExpression(tokens, depth, result)) |
| return false; |
| |
| while (!tokens.atEnd()) { |
| char operatorCharacter = operatorValue(tokens.peek()); |
| if (operatorCharacter != CalcAdd && operatorCharacter != CalcSubtract) |
| 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(); |
| |
| Value rhs; |
| if (!parseValueMultiplicativeExpression(tokens, depth, &rhs)) |
| return false; |
| |
| result->value = CSSCalcBinaryOperation::createSimplified(result->value, rhs.value, static_cast<CalcOperator>(operatorCharacter)); |
| if (!result->value) |
| return false; |
| } |
| |
| return true; |
| } |
| |
| bool parseValueExpression(CSSParserTokenRange& tokens, int depth, Value* result) |
| { |
| return parseAdditiveValueExpression(tokens, depth, result); |
| } |
| }; |
| |
| PassRefPtrWillBeRawPtr<CSSCalcExpressionNode> CSSCalcValue::createExpressionNode(PassRefPtrWillBeRawPtr<CSSPrimitiveValue> value, bool isInteger) |
| { |
| return CSSCalcPrimitiveValue::create(value, isInteger); |
| } |
| |
| PassRefPtrWillBeRawPtr<CSSCalcExpressionNode> CSSCalcValue::createExpressionNode(PassRefPtrWillBeRawPtr<CSSCalcExpressionNode> leftSide, PassRefPtrWillBeRawPtr<CSSCalcExpressionNode> rightSide, CalcOperator op) |
| { |
| return CSSCalcBinaryOperation::create(leftSide, rightSide, op); |
| } |
| |
| PassRefPtrWillBeRawPtr<CSSCalcExpressionNode> CSSCalcValue::createExpressionNode(double pixels, double percent) |
| { |
| return createExpressionNode( |
| createExpressionNode(CSSPrimitiveValue::create(pixels, CSSPrimitiveValue::UnitType::Pixels), pixels == trunc(pixels)), |
| createExpressionNode(CSSPrimitiveValue::create(percent, CSSPrimitiveValue::UnitType::Percentage), percent == trunc(percent)), |
| CalcAdd); |
| } |
| |
| PassRefPtrWillBeRawPtr<CSSCalcValue> CSSCalcValue::create(const CSSParserTokenRange& tokens, ValueRange range) |
| { |
| CSSCalcExpressionNodeParser parser; |
| RefPtrWillBeRawPtr<CSSCalcExpressionNode> expression = parser.parseCalc(tokens); |
| |
| return expression ? adoptRefWillBeNoop(new CSSCalcValue(expression, range)) : nullptr; |
| } |
| |
| PassRefPtrWillBeRawPtr<CSSCalcValue> CSSCalcValue::create(PassRefPtrWillBeRawPtr<CSSCalcExpressionNode> expression, ValueRange range) |
| { |
| return adoptRefWillBeNoop(new CSSCalcValue(expression, range)); |
| } |
| |
| } // namespace blink |
