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 "CSSParserValues.h" 35#include "CSSValue.h" 36#include "CalculationValue.h" 37#include <wtf/PassOwnPtr.h> 38#include <wtf/RefCounted.h> 39#include <wtf/RefPtr.h> 40 41namespace WebCore { 42 43class CSSParserValueList; 44class CSSValueList; 45class RenderStyle; 46class CalculationValue; 47class CalcExpressionNode; 48 49enum CalculationCategory { 50 CalcNumber = 0, 51 CalcLength, 52 CalcPercent, 53 CalcPercentNumber, 54 CalcPercentLength, 55#if ENABLE(CSS_VARIABLES) 56 CalcVariable, 57#endif 58 CalcOther 59}; 60 61class CSSCalcExpressionNode : public RefCounted<CSSCalcExpressionNode> { 62public: 63 enum Type { 64 CssCalcPrimitiveValue = 1, 65 CssCalcBinaryOperation 66 }; 67 68 virtual ~CSSCalcExpressionNode() = 0; 69 virtual bool isZero() const = 0; 70 virtual PassOwnPtr<CalcExpressionNode> toCalcValue(const RenderStyle*, const RenderStyle* rootStyle, double zoom = 1.0) const = 0; 71 virtual double doubleValue() const = 0; 72 virtual double computeLengthPx(const RenderStyle* currentStyle, const RenderStyle* rootStyle, double multiplier = 1.0, bool computingFontSize = false) const = 0; 73 virtual String customCssText() const = 0; 74#if ENABLE(CSS_VARIABLES) 75 virtual String serializeResolvingVariables(const HashMap<AtomicString, String>&) const = 0; 76 virtual bool hasVariableReference() const = 0; 77#endif 78 virtual bool equals(const CSSCalcExpressionNode& other) const { return m_category == other.m_category && m_isInteger == other.m_isInteger; } 79 virtual Type type() const = 0; 80 81 CalculationCategory category() const { return m_category; } 82 bool isInteger() const { return m_isInteger; } 83 84protected: 85 CSSCalcExpressionNode(CalculationCategory category, bool isInteger) 86 : m_category(category) 87 , m_isInteger(isInteger) 88 { 89 } 90 91 CalculationCategory m_category; 92 bool m_isInteger; 93}; 94 95class CSSCalcValue : public CSSValue { 96public: 97 static PassRefPtr<CSSCalcValue> create(CSSParserString name, CSSParserValueList*, CalculationPermittedValueRange); 98 static PassRefPtr<CSSCalcValue> create(CalculationValue*); 99 100 PassRefPtr<CalculationValue> toCalcValue(const RenderStyle* style, const RenderStyle* rootStyle, double zoom = 1.0) const 101 { 102 return CalculationValue::create(m_expression->toCalcValue(style, rootStyle, zoom), m_nonNegative ? CalculationRangeNonNegative : CalculationRangeAll); 103 } 104 CalculationCategory category() const { return m_expression->category(); } 105 bool isInt() const { return m_expression->isInteger(); } 106 double doubleValue() const; 107 bool isNegative() const { return m_expression->doubleValue() < 0; } 108 double computeLengthPx(const RenderStyle* currentStyle, const RenderStyle* rootStyle, double multiplier = 1.0, bool computingFontSize = false) const; 109 110 String customCssText() const; 111 bool equals(const CSSCalcValue&) const; 112#if ENABLE(CSS_VARIABLES) 113 String customSerializeResolvingVariables(const HashMap<AtomicString, String>&) const; 114 bool hasVariableReference() const; 115#endif 116 117private: 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} // namespace WebCore 132 133#endif // CSSCalculationValue_h 134