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 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 CSSToLengthConversionData&) const = 0; 70 virtual double doubleValue() const = 0; 71 virtual double computeLengthPx(const CSSToLengthConversionData&) const = 0; 72 virtual String customCSSText() const = 0; 73 virtual String serializeResolvingVariables(const HashMap<AtomicString, String>&) const = 0; 74 virtual bool hasVariableReference() const = 0; equals(const CSSCalcExpressionNode & other)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 category()78 CalculationCategory category() const { return m_category; } 79 virtual CSSPrimitiveValue::UnitTypes primitiveType() const = 0; isInteger()80 bool isInteger() const { return m_isInteger; } 81 82 protected: CSSCalcExpressionNode(CalculationCategory category,bool isInteger)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*, ValueRange); 96 static PassRefPtr<CSSCalcValue> create(PassRefPtr<CSSCalcExpressionNode>, ValueRange = ValueRangeAll); create(const CalculationValue * value,float zoom)97 static PassRefPtr<CSSCalcValue> create(const CalculationValue* value, float zoom) { return adoptRef(new CSSCalcValue(value, zoom)); } 98 99 static PassRefPtr<CSSCalcExpressionNode> createExpressionNode(PassRefPtr<CSSPrimitiveValue>, bool isInteger = false); 100 static PassRefPtr<CSSCalcExpressionNode> createExpressionNode(PassRefPtr<CSSCalcExpressionNode>, PassRefPtr<CSSCalcExpressionNode>, CalcOperator); 101 static PassRefPtr<CSSCalcExpressionNode> createExpressionNode(const CalcExpressionNode*, float zoom); 102 static PassRefPtr<CSSCalcExpressionNode> createExpressionNode(const Length&, float zoom); 103 toCalcValue(const CSSToLengthConversionData & conversionData)104 PassRefPtr<CalculationValue> toCalcValue(const CSSToLengthConversionData& conversionData) const 105 { 106 return CalculationValue::create(m_expression->toCalcValue(conversionData), m_nonNegative ? ValueRangeNonNegative : ValueRangeAll); 107 } category()108 CalculationCategory category() const { return m_expression->category(); } isInt()109 bool isInt() const { return m_expression->isInteger(); } 110 double doubleValue() const; isNegative()111 bool isNegative() const { return m_expression->doubleValue() < 0; } permittedValueRange()112 ValueRange permittedValueRange() { return m_nonNegative ? ValueRangeNonNegative : ValueRangeAll; } 113 double computeLengthPx(const CSSToLengthConversionData&) const; expressionNode()114 CSSCalcExpressionNode* expressionNode() const { return m_expression.get(); } 115 116 String customCSSText() const; 117 bool equals(const CSSCalcValue&) const; 118 String customSerializeResolvingVariables(const HashMap<AtomicString, String>&) const; 119 bool hasVariableReference() const; 120 121 private: CSSCalcValue(PassRefPtr<CSSCalcExpressionNode> expression,ValueRange range)122 CSSCalcValue(PassRefPtr<CSSCalcExpressionNode> expression, ValueRange range) 123 : CSSValue(CalculationClass) 124 , m_expression(expression) 125 , m_nonNegative(range == ValueRangeNonNegative) 126 { 127 } CSSCalcValue(const CalculationValue * value,float zoom)128 CSSCalcValue(const CalculationValue* value, float zoom) 129 : CSSValue(CalculationClass) 130 , m_expression(createExpressionNode(value->expression(), zoom)) 131 , m_nonNegative(value->isNonNegative()) 132 { 133 } 134 135 double clampToPermittedRange(double) const; 136 137 const RefPtr<CSSCalcExpressionNode> m_expression; 138 const bool m_nonNegative; 139 }; 140 141 DEFINE_CSS_VALUE_TYPE_CASTS(CSSCalcValue, isCalcValue()); 142 143 } // namespace WebCore 144 145 146 #endif // CSSCalculationValue_h 147