| /* |
| * Copyright (C) 2011, 2012 Google Inc. All rights reserved. |
| * Copyright (C) 2014 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 "StyleResolver.h" |
| #include <wtf/MathExtras.h> |
| #include <wtf/text/StringBuilder.h> |
| |
| static const int maxExpressionDepth = 100; |
| |
| enum ParseState { |
| OK, |
| TooDeep, |
| NoMoreTokens |
| }; |
| |
| namespace WebCore { |
| |
| static RefPtr<CSSCalcExpressionNode> createCSS(const CalcExpressionNode&, const RenderStyle&); |
| static RefPtr<CSSCalcExpressionNode> createCSS(const Length&, const RenderStyle&); |
| |
| static CalculationCategory unitCategory(CSSPrimitiveValue::UnitType type) |
| { |
| switch (type) { |
| case CSSPrimitiveValue::CSS_NUMBER: |
| return CalcNumber; |
| case CSSPrimitiveValue::CSS_EMS: |
| case CSSPrimitiveValue::CSS_EXS: |
| case CSSPrimitiveValue::CSS_PX: |
| case CSSPrimitiveValue::CSS_CM: |
| case CSSPrimitiveValue::CSS_MM: |
| case CSSPrimitiveValue::CSS_IN: |
| case CSSPrimitiveValue::CSS_PT: |
| case CSSPrimitiveValue::CSS_PC: |
| case CSSPrimitiveValue::CSS_REMS: |
| case CSSPrimitiveValue::CSS_CHS: |
| case CSSPrimitiveValue::CSS_VW: |
| case CSSPrimitiveValue::CSS_VH: |
| case CSSPrimitiveValue::CSS_VMIN: |
| case CSSPrimitiveValue::CSS_VMAX: |
| return CalcLength; |
| case CSSPrimitiveValue::CSS_PERCENTAGE: |
| return CalcPercent; |
| case CSSPrimitiveValue::CSS_DEG: |
| case CSSPrimitiveValue::CSS_RAD: |
| case CSSPrimitiveValue::CSS_GRAD: |
| case CSSPrimitiveValue::CSS_TURN: |
| return CalcAngle; |
| case CSSPrimitiveValue::CSS_MS: |
| case CSSPrimitiveValue::CSS_S: |
| return CalcTime; |
| case CSSPrimitiveValue::CSS_HZ: |
| case CSSPrimitiveValue::CSS_KHZ: |
| return CalcFrequency; |
| default: |
| return CalcOther; |
| } |
| } |
| |
| static bool hasDoubleValue(CSSPrimitiveValue::UnitType type) |
| { |
| switch (type) { |
| case CSSPrimitiveValue::CSS_FR: |
| case CSSPrimitiveValue::CSS_NUMBER: |
| case CSSPrimitiveValue::CSS_PERCENTAGE: |
| case CSSPrimitiveValue::CSS_EMS: |
| case CSSPrimitiveValue::CSS_EXS: |
| case CSSPrimitiveValue::CSS_CHS: |
| case CSSPrimitiveValue::CSS_REMS: |
| case CSSPrimitiveValue::CSS_PX: |
| case CSSPrimitiveValue::CSS_CM: |
| case CSSPrimitiveValue::CSS_MM: |
| case CSSPrimitiveValue::CSS_IN: |
| case CSSPrimitiveValue::CSS_PT: |
| case CSSPrimitiveValue::CSS_PC: |
| case CSSPrimitiveValue::CSS_DEG: |
| case CSSPrimitiveValue::CSS_RAD: |
| case CSSPrimitiveValue::CSS_GRAD: |
| case CSSPrimitiveValue::CSS_TURN: |
| case CSSPrimitiveValue::CSS_MS: |
| case CSSPrimitiveValue::CSS_S: |
| case CSSPrimitiveValue::CSS_HZ: |
| case CSSPrimitiveValue::CSS_KHZ: |
| case CSSPrimitiveValue::CSS_DIMENSION: |
| case CSSPrimitiveValue::CSS_VW: |
| case CSSPrimitiveValue::CSS_VH: |
| case CSSPrimitiveValue::CSS_VMIN: |
| case CSSPrimitiveValue::CSS_VMAX: |
| case CSSPrimitiveValue::CSS_DPPX: |
| case CSSPrimitiveValue::CSS_DPI: |
| case CSSPrimitiveValue::CSS_DPCM: |
| return true; |
| case CSSPrimitiveValue::CSS_UNKNOWN: |
| case CSSPrimitiveValue::CSS_STRING: |
| case CSSPrimitiveValue::CSS_FONT_FAMILY: |
| case CSSPrimitiveValue::CSS_URI: |
| case CSSPrimitiveValue::CSS_IDENT: |
| case CSSPrimitiveValue::CSS_ATTR: |
| case CSSPrimitiveValue::CSS_COUNTER: |
| case CSSPrimitiveValue::CSS_RECT: |
| case CSSPrimitiveValue::CSS_RGBCOLOR: |
| case CSSPrimitiveValue::CSS_PAIR: |
| case CSSPrimitiveValue::CSS_UNICODE_RANGE: |
| case CSSPrimitiveValue::CSS_COUNTER_NAME: |
| case CSSPrimitiveValue::CSS_SHAPE: |
| case CSSPrimitiveValue::CSS_QUAD: |
| case CSSPrimitiveValue::CSS_QUIRKY_EMS: |
| case CSSPrimitiveValue::CSS_CALC: |
| case CSSPrimitiveValue::CSS_CALC_PERCENTAGE_WITH_NUMBER: |
| case CSSPrimitiveValue::CSS_CALC_PERCENTAGE_WITH_LENGTH: |
| case CSSPrimitiveValue::CSS_PROPERTY_ID: |
| case CSSPrimitiveValue::CSS_VALUE_ID: |
| #if ENABLE(DASHBOARD_SUPPORT) |
| case CSSPrimitiveValue::CSS_DASHBOARD_REGION: |
| #endif |
| 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 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()); |
| } |
| |
| double CSSCalcValue::computeLengthPx(const CSSToLengthConversionData& conversionData) const |
| { |
| return clampToPermittedRange(m_expression->computeLengthPx(conversionData)); |
| } |
| |
| class CSSCalcPrimitiveValue final : public CSSCalcExpressionNode { |
| WTF_MAKE_FAST_ALLOCATED; |
| public: |
| static Ref<CSSCalcPrimitiveValue> create(Ref<CSSPrimitiveValue>&& value, bool isInteger) |
| { |
| return adoptRef(*new CSSCalcPrimitiveValue(WTFMove(value), isInteger)); |
| } |
| |
| static RefPtr<CSSCalcPrimitiveValue> create(double value, CSSPrimitiveValue::UnitType type, bool isInteger) |
| { |
| if (!std::isfinite(value)) |
| return nullptr; |
| return adoptRef(new CSSCalcPrimitiveValue(CSSPrimitiveValue::create(value, type), isInteger)); |
| } |
| |
| private: |
| bool isZero() const final |
| { |
| return !m_value->doubleValue(); |
| } |
| |
| String customCSSText() const final |
| { |
| return m_value->cssText(); |
| } |
| |
| std::unique_ptr<CalcExpressionNode> createCalcExpression(const CSSToLengthConversionData& conversionData) const final |
| { |
| switch (category()) { |
| case CalcNumber: |
| return std::make_unique<CalcExpressionNumber>(m_value->floatValue()); |
| case CalcLength: |
| return std::make_unique<CalcExpressionLength>(Length(m_value->computeLength<float>(conversionData), WebCore::Fixed)); |
| case CalcPercent: |
| case CalcPercentLength: { |
| return std::make_unique<CalcExpressionLength>(m_value->convertToLength<FixedFloatConversion | PercentConversion>(conversionData)); |
| } |
| // Only types that could be part of a Length expression can be converted |
| // to a CalcExpressionNode. CalcPercentNumber makes no sense as a Length. |
| case CalcPercentNumber: |
| case CalcAngle: |
| case CalcTime: |
| case CalcFrequency: |
| case CalcOther: |
| ASSERT_NOT_REACHED(); |
| } |
| ASSERT_NOT_REACHED(); |
| return nullptr; |
| } |
| |
| double doubleValue() const final |
| { |
| if (hasDoubleValue(primitiveType())) |
| return m_value->doubleValue(); |
| ASSERT_NOT_REACHED(); |
| return 0; |
| } |
| |
| double computeLengthPx(const CSSToLengthConversionData& conversionData) const final |
| { |
| switch (category()) { |
| case CalcLength: |
| return m_value->computeLength<double>(conversionData); |
| case CalcPercent: |
| case CalcNumber: |
| return m_value->doubleValue(); |
| case CalcPercentLength: |
| case CalcPercentNumber: |
| case CalcAngle: |
| case CalcTime: |
| case CalcFrequency: |
| case CalcOther: |
| ASSERT_NOT_REACHED(); |
| break; |
| } |
| ASSERT_NOT_REACHED(); |
| return 0; |
| } |
| |
| bool equals(const CSSCalcExpressionNode& other) const final |
| { |
| if (type() != other.type()) |
| return false; |
| |
| return compareCSSValue(m_value, static_cast<const CSSCalcPrimitiveValue&>(other).m_value); |
| } |
| |
| Type type() const final { return CssCalcPrimitiveValue; } |
| CSSPrimitiveValue::UnitType primitiveType() const final |
| { |
| return CSSPrimitiveValue::UnitType(m_value->primitiveType()); |
| } |
| |
| private: |
| explicit CSSCalcPrimitiveValue(Ref<CSSPrimitiveValue>&& value, bool isInteger) |
| : CSSCalcExpressionNode(unitCategory((CSSPrimitiveValue::UnitType)value->primitiveType()), isInteger) |
| , m_value(WTFMove(value)) |
| { |
| } |
| |
| Ref<CSSPrimitiveValue> m_value; |
| }; |
| |
| static const CalculationCategory addSubtractResult[CalcAngle][CalcAngle] = { |
| // CalcNumber CalcLength CalcPercent CalcPercentNumber CalcPercentLength |
| { CalcNumber, CalcOther, CalcPercentNumber, CalcPercentNumber, CalcOther }, // CalcNumber |
| { CalcOther, CalcLength, CalcPercentLength, CalcOther, CalcPercentLength }, // CalcLength |
| { CalcPercentNumber, CalcPercentLength, CalcPercent, CalcPercentNumber, CalcPercentLength }, // CalcPercent |
| { CalcPercentNumber, CalcOther, CalcPercentNumber, CalcPercentNumber, CalcOther }, // CalcPercentNumber |
| { CalcOther, CalcPercentLength, CalcPercentLength, CalcOther, CalcPercentLength }, // CalcPercentLength |
| }; |
| |
| static CalculationCategory determineCategory(const CSSCalcExpressionNode& leftSide, const CSSCalcExpressionNode& rightSide, CalcOperator op) |
| { |
| CalculationCategory leftCategory = leftSide.category(); |
| CalculationCategory rightCategory = rightSide.category(); |
| ASSERT(leftCategory < CalcOther); |
| ASSERT(rightCategory < CalcOther); |
| |
| switch (op) { |
| case CalcAdd: |
| case CalcSubtract: |
| if (leftCategory < CalcAngle && rightCategory < CalcAngle) |
| return addSubtractResult[leftCategory][rightCategory]; |
| if (leftCategory == rightCategory) |
| return leftCategory; |
| return CalcOther; |
| 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 inline bool isIntegerResult(CalcOperator op, const CSSCalcExpressionNode& leftSide, const CSSCalcExpressionNode& rightSide) |
| { |
| // 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 { |
| WTF_MAKE_FAST_ALLOCATED; |
| public: |
| static RefPtr<CSSCalcBinaryOperation> create(CalcOperator op, RefPtr<CSSCalcExpressionNode>&& leftSide, RefPtr<CSSCalcExpressionNode>&& rightSide) |
| { |
| if (!leftSide || !rightSide) |
| return nullptr; |
| |
| ASSERT(leftSide->category() < CalcOther); |
| ASSERT(rightSide->category() < CalcOther); |
| |
| auto newCategory = determineCategory(*leftSide, *rightSide, op); |
| if (newCategory == CalcOther) |
| return nullptr; |
| return adoptRef(new CSSCalcBinaryOperation(newCategory, op, leftSide.releaseNonNull(), rightSide.releaseNonNull())); |
| } |
| |
| static RefPtr<CSSCalcExpressionNode> createSimplified(CalcOperator op, RefPtr<CSSCalcExpressionNode>&& leftSide, RefPtr<CSSCalcExpressionNode>&& rightSide) |
| { |
| if (!leftSide || !rightSide) |
| return nullptr; |
| |
| auto leftCategory = leftSide->category(); |
| auto rightCategory = rightSide->category(); |
| ASSERT(leftCategory < CalcOther); |
| ASSERT(rightCategory < CalcOther); |
| |
| bool isInteger = isIntegerResult(op, *leftSide, *rightSide); |
| |
| // Simplify numbers. |
| if (leftCategory == CalcNumber && rightCategory == CalcNumber) { |
| CSSPrimitiveValue::UnitType evaluationType = CSSPrimitiveValue::CSS_NUMBER; |
| return CSSCalcPrimitiveValue::create(evaluateOperator(op, leftSide->doubleValue(), rightSide->doubleValue()), evaluationType, isInteger); |
| } |
| |
| // Simplify addition and subtraction between same types. |
| if (op == CalcAdd || op == CalcSubtract) { |
| if (leftCategory == rightSide->category()) { |
| CSSPrimitiveValue::UnitType leftType = leftSide->primitiveType(); |
| if (hasDoubleValue(leftType)) { |
| CSSPrimitiveValue::UnitType rightType = rightSide->primitiveType(); |
| if (leftType == rightType) |
| return CSSCalcPrimitiveValue::create(evaluateOperator(op, leftSide->doubleValue(), rightSide->doubleValue()), 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::CSS_UNKNOWN) { |
| double leftValue = leftSide->doubleValue() * CSSPrimitiveValue::conversionToCanonicalUnitsScaleFactor(leftType); |
| double rightValue = rightSide->doubleValue() * CSSPrimitiveValue::conversionToCanonicalUnitsScaleFactor(rightType); |
| return CSSCalcPrimitiveValue::create(evaluateOperator(op, leftValue, rightValue), canonicalType, isInteger); |
| } |
| } |
| } |
| } |
| } else { |
| // Simplify multiplying or dividing by a number for simplifiable types. |
| ASSERT(op == CalcMultiply || op == CalcDivide); |
| auto* numberSide = getNumberSide(*leftSide, *rightSide); |
| if (!numberSide) |
| return create(op, leftSide.releaseNonNull(), rightSide.releaseNonNull()); |
| if (numberSide == leftSide && op == CalcDivide) |
| return nullptr; |
| auto& otherSide = leftSide == numberSide ? *rightSide : *leftSide; |
| |
| double number = numberSide->doubleValue(); |
| if (!std::isfinite(number)) |
| return nullptr; |
| if (op == CalcDivide && !number) |
| return nullptr; |
| |
| auto otherType = otherSide.primitiveType(); |
| if (hasDoubleValue(otherType)) |
| return CSSCalcPrimitiveValue::create(evaluateOperator(op, otherSide.doubleValue(), number), otherType, isInteger); |
| } |
| |
| return create(op, leftSide.releaseNonNull(), rightSide.releaseNonNull()); |
| } |
| |
| private: |
| bool isZero() const final |
| { |
| return !doubleValue(); |
| } |
| |
| std::unique_ptr<CalcExpressionNode> createCalcExpression(const CSSToLengthConversionData& conversionData) const final |
| { |
| auto left = m_leftSide->createCalcExpression(conversionData); |
| if (!left) |
| return nullptr; |
| auto right = m_rightSide->createCalcExpression(conversionData); |
| if (!right) |
| return nullptr; |
| return std::make_unique<CalcExpressionBinaryOperation>(WTFMove(left), WTFMove(right), m_operator); |
| } |
| |
| double doubleValue() const final |
| { |
| return evaluate(m_leftSide->doubleValue(), m_rightSide->doubleValue()); |
| } |
| |
| double computeLengthPx(const CSSToLengthConversionData& conversionData) const final |
| { |
| const double leftValue = m_leftSide->computeLengthPx(conversionData); |
| const double rightValue = m_rightSide->computeLengthPx(conversionData); |
| return evaluate(leftValue, rightValue); |
| } |
| |
| 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 final |
| { |
| return buildCssText(m_leftSide->customCSSText(), m_rightSide->customCSSText(), m_operator); |
| } |
| |
| bool equals(const CSSCalcExpressionNode& exp) const final |
| { |
| 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 final { return CssCalcBinaryOperation; } |
| |
| CSSPrimitiveValue::UnitType primitiveType() const final |
| { |
| switch (category()) { |
| case CalcNumber: |
| ASSERT(m_leftSide->category() == CalcNumber && m_rightSide->category() == CalcNumber); |
| return CSSPrimitiveValue::CSS_NUMBER; |
| case CalcLength: |
| case CalcPercent: { |
| if (m_leftSide->category() == CalcNumber) |
| return m_rightSide->primitiveType(); |
| if (m_rightSide->category() == CalcNumber) |
| return m_leftSide->primitiveType(); |
| CSSPrimitiveValue::UnitType leftType = m_leftSide->primitiveType(); |
| if (leftType == m_rightSide->primitiveType()) |
| return leftType; |
| return CSSPrimitiveValue::CSS_UNKNOWN; |
| } |
| case CalcAngle: |
| return CSSPrimitiveValue::CSS_DEG; |
| case CalcTime: |
| return CSSPrimitiveValue::CSS_MS; |
| case CalcFrequency: |
| return CSSPrimitiveValue::CSS_HZ; |
| case CalcPercentLength: |
| case CalcPercentNumber: |
| case CalcOther: |
| return CSSPrimitiveValue::CSS_UNKNOWN; |
| } |
| ASSERT_NOT_REACHED(); |
| return CSSPrimitiveValue::CSS_UNKNOWN; |
| } |
| |
| CSSCalcBinaryOperation(CalculationCategory category, CalcOperator op, Ref<CSSCalcExpressionNode>&& leftSide, Ref<CSSCalcExpressionNode>&& rightSide) |
| : CSSCalcExpressionNode(category, isIntegerResult(op, leftSide.get(), rightSide.get())) |
| , m_leftSide(WTFMove(leftSide)) |
| , m_rightSide(WTFMove(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(m_operator, leftSide, rightSide); |
| } |
| |
| static double evaluateOperator(CalcOperator op, double leftValue, double rightValue) |
| { |
| 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(); |
| } |
| ASSERT_NOT_REACHED(); |
| return 0; |
| } |
| |
| const RefPtr<CSSCalcExpressionNode> m_leftSide; |
| const RefPtr<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 { |
| public: |
| RefPtr<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 { |
| RefPtr<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 || tokens.peek().functionId() == CSSValueCalc) { |
| CSSParserTokenRange innerRange = tokens.consumeBlock(); |
| tokens.consumeWhitespace(); |
| innerRange.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(static_cast<CalcOperator>(operatorCharacter), WTFMove(result->value), WTFMove(rhs.value)); |
| |
| 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(static_cast<CalcOperator>(operatorCharacter), WTFMove(result->value), WTFMove(rhs.value)); |
| if (!result->value) |
| return false; |
| } |
| |
| return true; |
| } |
| |
| bool parseValueExpression(CSSParserTokenRange& tokens, int depth, Value* result) |
| { |
| return parseAdditiveValueExpression(tokens, depth, result); |
| } |
| }; |
| |
| static inline RefPtr<CSSCalcBinaryOperation> createBlendHalf(const Length& length, const RenderStyle& style, float progress) |
| { |
| return CSSCalcBinaryOperation::create(CalcMultiply, createCSS(length, style), |
| CSSCalcPrimitiveValue::create(CSSPrimitiveValue::create(progress, CSSPrimitiveValue::CSS_NUMBER), !progress || progress == 1)); |
| } |
| |
| static RefPtr<CSSCalcExpressionNode> createCSS(const CalcExpressionNode& node, const RenderStyle& style) |
| { |
| switch (node.type()) { |
| case CalcExpressionNodeNumber: { |
| float value = toCalcExpressionNumber(node).value(); |
| return CSSCalcPrimitiveValue::create(CSSPrimitiveValue::create(value, CSSPrimitiveValue::CSS_NUMBER), value == std::trunc(value)); |
| } |
| case CalcExpressionNodeLength: |
| return createCSS(toCalcExpressionLength(node).length(), style); |
| case CalcExpressionNodeBinaryOperation: { |
| auto& binaryNode = toCalcExpressionBinaryOperation(node); |
| return CSSCalcBinaryOperation::create(binaryNode.getOperator(), createCSS(binaryNode.leftSide(), style), createCSS(binaryNode.rightSide(), style)); |
| } |
| case CalcExpressionNodeBlendLength: { |
| // FIXME: (http://webkit.org/b/122036) Create a CSSCalcExpressionNode equivalent of CalcExpressionBlendLength. |
| auto& blend = toCalcExpressionBlendLength(node); |
| float progress = blend.progress(); |
| return CSSCalcBinaryOperation::create(CalcAdd, createBlendHalf(blend.from(), style, 1 - progress), createBlendHalf(blend.to(), style, progress)); |
| } |
| case CalcExpressionNodeUndefined: |
| ASSERT_NOT_REACHED(); |
| } |
| return nullptr; |
| } |
| |
| static RefPtr<CSSCalcExpressionNode> createCSS(const Length& length, const RenderStyle& style) |
| { |
| switch (length.type()) { |
| case Percent: |
| case Fixed: |
| return CSSCalcPrimitiveValue::create(CSSPrimitiveValue::create(length, style), length.value() == trunc(length.value())); |
| 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; |
| } |
| |
| RefPtr<CSSCalcValue> CSSCalcValue::create(const CSSParserTokenRange& tokens, ValueRange range) |
| { |
| CSSCalcExpressionNodeParser parser; |
| auto expression = parser.parseCalc(tokens); |
| if (!expression) |
| return nullptr; |
| return adoptRef(new CSSCalcValue(expression.releaseNonNull(), range != ValueRangeAll)); |
| } |
| |
| RefPtr<CSSCalcValue> CSSCalcValue::create(const CalculationValue& value, const RenderStyle& style) |
| { |
| auto expression = createCSS(value.expression(), style); |
| if (!expression) |
| return nullptr; |
| return adoptRef(new CSSCalcValue(expression.releaseNonNull(), value.shouldClampToNonNegative())); |
| } |
| |
| } // namespace WebCore |
