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 *
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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.
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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,
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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
42namespace blink {
43
44class CSSParserValueList;
45class CalculationValue;
46
47enum 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.
56enum CalculationCategory {
57    CalcNumber = 0,
58    CalcLength,
59    CalcPercent,
60    CalcPercentNumber,
61    CalcPercentLength,
62    CalcAngle,
63    CalcTime,
64    CalcFrequency,
65    CalcOther
66};
67
68class CSSCalcExpressionNode : public RefCountedWillBeGarbageCollected<CSSCalcExpressionNode> {
69    DECLARE_EMPTY_VIRTUAL_DESTRUCTOR_WILL_BE_REMOVED(CSSCalcExpressionNode);
70public:
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;
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
85    CalculationCategory category() const { return m_category; }
86    virtual CSSPrimitiveValue::UnitType primitiveType() const = 0;
87    bool isInteger() const { return m_isInteger; }
88
89    virtual void trace(Visitor*) { }
90
91protected:
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
103class CSSCalcValue : public CSSValue {
104public:
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
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    }
118    CalculationCategory category() const { return m_expression->category(); }
119    bool isInt() const { return m_expression->isInteger(); }
120    double doubleValue() const;
121    bool isNegative() const { return m_expression->doubleValue() < 0; }
122    ValueRange permittedValueRange() { return m_nonNegative ? ValueRangeNonNegative : ValueRangeAll; }
123    double computeLengthPx(const CSSToLengthConversionData&) const;
124    void accumulateLengthArray(CSSLengthArray& lengthArray, double multiplier) const { m_expression->accumulateLengthArray(lengthArray, multiplier); }
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
132private:
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
146DEFINE_CSS_VALUE_TYPE_CASTS(CSSCalcValue, isCalcValue());
147
148} // namespace blink
149
150
151#endif // CSSCalculationValue_h
152