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/CSSParserValues.h" 35 #include "core/css/CSSPrimitiveValue.h" 36 #include "core/css/CSSValue.h" 37 #include "platform/CalculationValue.h" 38 #include "wtf/PassOwnPtr.h" 39 #include "wtf/RefCounted.h" 40 #include "wtf/RefPtr.h" 41 42 namespace WebCore { 43 44 class CSSParserValueList; 45 class CSSValueList; 46 class CalculationValue; 47 class CalcExpressionNode; 48 class Length; 49 50 enum CalcOperator { 51 CalcAdd = '+', 52 CalcSubtract = '-', 53 CalcMultiply = '*', 54 CalcDivide = '/' 55 }; 56 57 enum CalculationCategory { 58 CalcNumber = 0, 59 CalcLength, 60 CalcPercent, 61 CalcPercentNumber, 62 CalcPercentLength, 63 CalcOther 64 }; 65 66 class CSSCalcExpressionNode : public RefCountedWillBeGarbageCollected<CSSCalcExpressionNode> { 67 DECLARE_EMPTY_VIRTUAL_DESTRUCTOR_WILL_BE_REMOVED(CSSCalcExpressionNode); 68 public: 69 enum Type { 70 CssCalcPrimitiveValue = 1, 71 CssCalcBinaryOperation 72 }; 73 74 virtual bool isZero() const = 0; 75 virtual double doubleValue() const = 0; 76 virtual double computeLengthPx(const CSSToLengthConversionData&) const = 0; 77 virtual void accumulateLengthArray(CSSLengthArray&, double multiplier) const = 0; 78 virtual void accumulatePixelsAndPercent(const CSSToLengthConversionData&, PixelsAndPercent&, float multiplier = 1) const = 0; 79 virtual String customCSSText() const = 0; equals(const CSSCalcExpressionNode & other)80 virtual bool equals(const CSSCalcExpressionNode& other) const { return m_category == other.m_category && m_isInteger == other.m_isInteger; } 81 virtual Type type() const = 0; 82 category()83 CalculationCategory category() const { return m_category; } 84 virtual CSSPrimitiveValue::UnitType primitiveType() const = 0; isInteger()85 bool isInteger() const { return m_isInteger; } 86 trace(Visitor *)87 virtual void trace(Visitor*) { } 88 89 protected: CSSCalcExpressionNode(CalculationCategory category,bool isInteger)90 CSSCalcExpressionNode(CalculationCategory category, bool isInteger) 91 : m_category(category) 92 , m_isInteger(isInteger) 93 { 94 ASSERT(category != CalcOther); 95 } 96 97 CalculationCategory m_category; 98 bool m_isInteger; 99 }; 100 101 class CSSCalcValue : public CSSValue { 102 public: 103 static PassRefPtrWillBeRawPtr<CSSCalcValue> create(CSSParserString name, CSSParserValueList*, ValueRange); 104 static PassRefPtrWillBeRawPtr<CSSCalcValue> create(PassRefPtrWillBeRawPtr<CSSCalcExpressionNode>, ValueRange = ValueRangeAll); 105 106 static PassRefPtrWillBeRawPtr<CSSCalcExpressionNode> createExpressionNode(PassRefPtrWillBeRawPtr<CSSPrimitiveValue>, bool isInteger = false); 107 static PassRefPtrWillBeRawPtr<CSSCalcExpressionNode> createExpressionNode(PassRefPtrWillBeRawPtr<CSSCalcExpressionNode>, PassRefPtrWillBeRawPtr<CSSCalcExpressionNode>, CalcOperator); 108 static PassRefPtrWillBeRawPtr<CSSCalcExpressionNode> createExpressionNode(double pixels, double percent); 109 toCalcValue(const CSSToLengthConversionData & conversionData)110 PassRefPtr<CalculationValue> toCalcValue(const CSSToLengthConversionData& conversionData) const 111 { 112 PixelsAndPercent value(0, 0); 113 m_expression->accumulatePixelsAndPercent(conversionData, value); 114 return CalculationValue::create(value, m_nonNegative ? ValueRangeNonNegative : ValueRangeAll); 115 } category()116 CalculationCategory category() const { return m_expression->category(); } isInt()117 bool isInt() const { return m_expression->isInteger(); } 118 double doubleValue() const; isNegative()119 bool isNegative() const { return m_expression->doubleValue() < 0; } permittedValueRange()120 ValueRange permittedValueRange() { return m_nonNegative ? ValueRangeNonNegative : ValueRangeAll; } 121 double computeLengthPx(const CSSToLengthConversionData&) const; accumulateLengthArray(CSSLengthArray & lengthArray,double multiplier)122 void accumulateLengthArray(CSSLengthArray& lengthArray, double multiplier) const { m_expression->accumulateLengthArray(lengthArray, multiplier); } expressionNode()123 CSSCalcExpressionNode* expressionNode() const { return m_expression.get(); } 124 125 String customCSSText() const; 126 bool equals(const CSSCalcValue&) const; 127 128 void traceAfterDispatch(Visitor*); 129 130 private: CSSCalcValue(PassRefPtrWillBeRawPtr<CSSCalcExpressionNode> expression,ValueRange range)131 CSSCalcValue(PassRefPtrWillBeRawPtr<CSSCalcExpressionNode> expression, ValueRange range) 132 : CSSValue(CalculationClass) 133 , m_expression(expression) 134 , m_nonNegative(range == ValueRangeNonNegative) 135 { 136 } 137 138 double clampToPermittedRange(double) const; 139 140 const RefPtrWillBeMember<CSSCalcExpressionNode> m_expression; 141 const bool m_nonNegative; 142 }; 143 144 DEFINE_CSS_VALUE_TYPE_CASTS(CSSCalcValue, isCalcValue()); 145 146 } // namespace WebCore 147 148 149 #endif // CSSCalculationValue_h 150