1 /* 2 * Copyright (C) 2011, 2012 Google Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are 6 * met: 7 * 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #ifndef CSSCalculationValue_h 32 #define CSSCalculationValue_h 33 34 #include "core/css/CSSPrimitiveValue.h" 35 #include "core/css/CSSValue.h" 36 #include "core/css/parser/CSSParserValues.h" 37 #include "platform/CalculationValue.h" 38 #include "wtf/PassOwnPtr.h" 39 #include "wtf/RefCounted.h" 40 #include "wtf/RefPtr.h" 41 42 namespace blink { 43 44 class CSSParserValueList; 45 class CalculationValue; 46 47 enum CalcOperator { 48 CalcAdd = '+', 49 CalcSubtract = '-', 50 CalcMultiply = '*', 51 CalcDivide = '/' 52 }; 53 54 // The order of this enum should not change since its elements are used as indices 55 // in the addSubtractResult matrix. 56 enum CalculationCategory { 57 CalcNumber = 0, 58 CalcLength, 59 CalcPercent, 60 CalcPercentNumber, 61 CalcPercentLength, 62 CalcAngle, 63 CalcTime, 64 CalcFrequency, 65 CalcOther 66 }; 67 68 class CSSCalcExpressionNode : public RefCountedWillBeGarbageCollected<CSSCalcExpressionNode> { 69 DECLARE_EMPTY_VIRTUAL_DESTRUCTOR_WILL_BE_REMOVED(CSSCalcExpressionNode); 70 public: 71 enum Type { 72 CssCalcPrimitiveValue = 1, 73 CssCalcBinaryOperation 74 }; 75 76 virtual bool isZero() const = 0; 77 virtual double doubleValue() const = 0; 78 virtual double computeLengthPx(const CSSToLengthConversionData&) const = 0; 79 virtual void accumulateLengthArray(CSSLengthArray&, double multiplier) const = 0; 80 virtual void accumulatePixelsAndPercent(const CSSToLengthConversionData&, PixelsAndPercent&, float multiplier = 1) const = 0; 81 virtual String customCSSText() const = 0; equals(const CSSCalcExpressionNode & other)82 virtual bool equals(const CSSCalcExpressionNode& other) const { return m_category == other.m_category && m_isInteger == other.m_isInteger; } 83 virtual Type type() const = 0; 84 category()85 CalculationCategory category() const { return m_category; } 86 virtual CSSPrimitiveValue::UnitType primitiveType() const = 0; isInteger()87 bool isInteger() const { return m_isInteger; } 88 trace(Visitor *)89 virtual void trace(Visitor*) { } 90 91 protected: CSSCalcExpressionNode(CalculationCategory category,bool isInteger)92 CSSCalcExpressionNode(CalculationCategory category, bool isInteger) 93 : m_category(category) 94 , m_isInteger(isInteger) 95 { 96 ASSERT(category != CalcOther); 97 } 98 99 CalculationCategory m_category; 100 bool m_isInteger; 101 }; 102 103 class CSSCalcValue : public CSSValue { 104 public: 105 static PassRefPtrWillBeRawPtr<CSSCalcValue> create(CSSParserString name, CSSParserValueList*, ValueRange); 106 static PassRefPtrWillBeRawPtr<CSSCalcValue> create(PassRefPtrWillBeRawPtr<CSSCalcExpressionNode>, ValueRange = ValueRangeAll); 107 108 static PassRefPtrWillBeRawPtr<CSSCalcExpressionNode> createExpressionNode(PassRefPtrWillBeRawPtr<CSSPrimitiveValue>, bool isInteger = false); 109 static PassRefPtrWillBeRawPtr<CSSCalcExpressionNode> createExpressionNode(PassRefPtrWillBeRawPtr<CSSCalcExpressionNode>, PassRefPtrWillBeRawPtr<CSSCalcExpressionNode>, CalcOperator); 110 static PassRefPtrWillBeRawPtr<CSSCalcExpressionNode> createExpressionNode(double pixels, double percent); 111 toCalcValue(const CSSToLengthConversionData & conversionData)112 PassRefPtr<CalculationValue> toCalcValue(const CSSToLengthConversionData& conversionData) const 113 { 114 PixelsAndPercent value(0, 0); 115 m_expression->accumulatePixelsAndPercent(conversionData, value); 116 return CalculationValue::create(value, m_nonNegative ? ValueRangeNonNegative : ValueRangeAll); 117 } category()118 CalculationCategory category() const { return m_expression->category(); } isInt()119 bool isInt() const { return m_expression->isInteger(); } 120 double doubleValue() const; isNegative()121 bool isNegative() const { return m_expression->doubleValue() < 0; } permittedValueRange()122 ValueRange permittedValueRange() { return m_nonNegative ? ValueRangeNonNegative : ValueRangeAll; } 123 double computeLengthPx(const CSSToLengthConversionData&) const; accumulateLengthArray(CSSLengthArray & lengthArray,double multiplier)124 void accumulateLengthArray(CSSLengthArray& lengthArray, double multiplier) const { m_expression->accumulateLengthArray(lengthArray, multiplier); } expressionNode()125 CSSCalcExpressionNode* expressionNode() const { return m_expression.get(); } 126 127 String customCSSText() const; 128 bool equals(const CSSCalcValue&) const; 129 130 void traceAfterDispatch(Visitor*); 131 132 private: CSSCalcValue(PassRefPtrWillBeRawPtr<CSSCalcExpressionNode> expression,ValueRange range)133 CSSCalcValue(PassRefPtrWillBeRawPtr<CSSCalcExpressionNode> expression, ValueRange range) 134 : CSSValue(CalculationClass) 135 , m_expression(expression) 136 , m_nonNegative(range == ValueRangeNonNegative) 137 { 138 } 139 140 double clampToPermittedRange(double) const; 141 142 const RefPtrWillBeMember<CSSCalcExpressionNode> m_expression; 143 const bool m_nonNegative; 144 }; 145 146 DEFINE_CSS_VALUE_TYPE_CASTS(CSSCalcValue, isCalcValue()); 147 148 } // namespace blink 149 150 151 #endif // CSSCalculationValue_h 152