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 "core/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 RenderStyle; 47 class CalculationValue; 48 class CalcExpressionNode; 49 50 enum CalculationCategory { 51 CalcNumber = 0, 52 CalcLength, 53 CalcPercent, 54 CalcPercentNumber, 55 CalcPercentLength, 56 CalcVariable, 57 CalcOther 58 }; 59 60 class CSSCalcExpressionNode : public RefCounted<CSSCalcExpressionNode> { 61 public: 62 enum Type { 63 CssCalcPrimitiveValue = 1, 64 CssCalcBinaryOperation 65 }; 66 67 virtual ~CSSCalcExpressionNode() = 0; 68 virtual bool isZero() const = 0; 69 virtual PassOwnPtr<CalcExpressionNode> toCalcValue(const RenderStyle*, const RenderStyle* rootStyle, double zoom = 1.0) const = 0; 70 virtual double doubleValue() const = 0; 71 virtual double computeLengthPx(const RenderStyle* currentStyle, const RenderStyle* rootStyle, double multiplier = 1.0, bool computingFontSize = false) const = 0; 72 virtual String customCssText() const = 0; 73 virtual String serializeResolvingVariables(const HashMap<AtomicString, String>&) const = 0; 74 virtual bool hasVariableReference() const = 0; 75 virtual bool equals(const CSSCalcExpressionNode& other) const { return m_category == other.m_category && m_isInteger == other.m_isInteger; } 76 virtual Type type() const = 0; 77 78 CalculationCategory category() const { return m_category; } 79 virtual CSSPrimitiveValue::UnitTypes primitiveType() const = 0; 80 bool isInteger() const { return m_isInteger; } 81 82 protected: 83 CSSCalcExpressionNode(CalculationCategory category, bool isInteger) 84 : m_category(category) 85 , m_isInteger(isInteger) 86 { 87 } 88 89 CalculationCategory m_category; 90 bool m_isInteger; 91 }; 92 93 class CSSCalcValue : public CSSValue { 94 public: 95 static PassRefPtr<CSSCalcValue> create(CSSParserString name, CSSParserValueList*, CalculationPermittedValueRange); 96 static PassRefPtr<CSSCalcValue> create(PassRefPtr<CSSCalcExpressionNode>, CalculationPermittedValueRange = CalculationRangeAll); 97 98 static PassRefPtr<CSSCalcExpressionNode> createExpressionNode(PassRefPtr<CSSPrimitiveValue>, bool isInteger = false); 99 static PassRefPtr<CSSCalcExpressionNode> createExpressionNode(PassRefPtr<CSSCalcExpressionNode>, PassRefPtr<CSSCalcExpressionNode>, CalcOperator); 100 101 PassRefPtr<CalculationValue> toCalcValue(const RenderStyle* style, const RenderStyle* rootStyle, double zoom = 1.0) const 102 { 103 return CalculationValue::create(m_expression->toCalcValue(style, rootStyle, zoom), m_nonNegative ? CalculationRangeNonNegative : CalculationRangeAll); 104 } 105 CalculationCategory category() const { return m_expression->category(); } 106 bool isInt() const { return m_expression->isInteger(); } 107 double doubleValue() const; 108 bool isNegative() const { return m_expression->doubleValue() < 0; } 109 double computeLengthPx(const RenderStyle* currentStyle, const RenderStyle* rootStyle, double multiplier = 1.0, bool computingFontSize = false) const; 110 CSSCalcExpressionNode* expressionNode() const { return m_expression.get(); } 111 112 String customCssText() const; 113 bool equals(const CSSCalcValue&) const; 114 String customSerializeResolvingVariables(const HashMap<AtomicString, String>&) const; 115 bool hasVariableReference() const; 116 117 private: 118 CSSCalcValue(PassRefPtr<CSSCalcExpressionNode> expression, CalculationPermittedValueRange range) 119 : CSSValue(CalculationClass) 120 , m_expression(expression) 121 , m_nonNegative(range == CalculationRangeNonNegative) 122 { 123 } 124 125 double clampToPermittedRange(double) const; 126 127 const RefPtr<CSSCalcExpressionNode> m_expression; 128 const bool m_nonNegative; 129 }; 130 131 inline CSSCalcValue* toCSSCalcValue(CSSValue* value) 132 { 133 ASSERT_WITH_SECURITY_IMPLICATION(!value || value->isCalculationValue()); 134 return static_cast<CSSCalcValue*>(value); 135 } 136 137 inline const CSSCalcValue* toCSSCalcValue(const CSSValue* value) 138 { 139 ASSERT_WITH_SECURITY_IMPLICATION(!value || value->isCalculationValue()); 140 return static_cast<const CSSCalcValue*>(value); 141 } 142 143 } // namespace WebCore 144 145 146 #endif // CSSCalculationValue_h 147