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/*
* Copyright (C) 2011 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef CalculationValue_h
#define CalculationValue_h
#include "Length.h"
#include "LengthFunctions.h"
#include <wtf/OwnPtr.h>
#include <wtf/PassOwnPtr.h>
#include <wtf/RefCounted.h>
#include <wtf/Vector.h>
namespace WebCore {
enum CalcOperator {
CalcAdd = '+',
CalcSubtract = '-',
CalcMultiply = '*',
CalcDivide = '/'
};
enum CalculationPermittedValueRange {
CalculationRangeAll,
CalculationRangeNonNegative
};
enum CalcExpressionNodeType {
CalcExpressionNodeUndefined,
CalcExpressionNodeNumber,
CalcExpressionNodeLength,
CalcExpressionNodeBinaryOperation,
CalcExpressionNodeBlendLength,
};
class CalcExpressionNode {
WTF_MAKE_FAST_ALLOCATED;
public:
CalcExpressionNode()
: m_type(CalcExpressionNodeUndefined)
{
}
virtual ~CalcExpressionNode()
{
}
virtual float evaluate(float maxValue) const = 0;
virtual bool operator==(const CalcExpressionNode&) const = 0;
CalcExpressionNodeType type() const { return m_type; }
protected:
CalcExpressionNodeType m_type;
};
class CalculationValue : public RefCounted<CalculationValue> {
public:
static PassRefPtr<CalculationValue> create(PassOwnPtr<CalcExpressionNode> value, CalculationPermittedValueRange);
float evaluate(float maxValue) const;
bool operator==(const CalculationValue& o) const
{
return *(m_value.get()) == *(o.m_value.get());
}
private:
CalculationValue(PassOwnPtr<CalcExpressionNode> value, CalculationPermittedValueRange range)
: m_value(value)
, m_isNonNegative(range == CalculationRangeNonNegative)
{
}
OwnPtr<CalcExpressionNode> m_value;
bool m_isNonNegative;
};
class CalcExpressionNumber : public CalcExpressionNode {
public:
explicit CalcExpressionNumber(float value)
: m_value(value)
{
m_type = CalcExpressionNodeNumber;
}
bool operator==(const CalcExpressionNumber& o) const
{
return m_value == o.m_value;
}
virtual bool operator==(const CalcExpressionNode& o) const
{
return type() == o.type() && *this == static_cast<const CalcExpressionNumber&>(o);
}
virtual float evaluate(float) const
{
return m_value;
}
private:
float m_value;
};
class CalcExpressionLength : public CalcExpressionNode {
public:
explicit CalcExpressionLength(Length length)
: m_length(length)
{
m_type = CalcExpressionNodeLength;
}
bool operator==(const CalcExpressionLength& o) const
{
return m_length == o.m_length;
}
virtual bool operator==(const CalcExpressionNode& o) const
{
return type() == o.type() && *this == static_cast<const CalcExpressionLength&>(o);
}
virtual float evaluate(float maxValue) const
{
return floatValueForLength(m_length, maxValue);
}
private:
Length m_length;
};
class CalcExpressionBinaryOperation : public CalcExpressionNode {
public:
CalcExpressionBinaryOperation(PassOwnPtr<CalcExpressionNode> leftSide, PassOwnPtr<CalcExpressionNode> rightSide, CalcOperator op)
: m_leftSide(leftSide)
, m_rightSide(rightSide)
, m_operator(op)
{
m_type = CalcExpressionNodeBinaryOperation;
}
bool operator==(const CalcExpressionBinaryOperation& o) const
{
return m_operator == o.m_operator && *m_leftSide == *o.m_leftSide && *m_rightSide == *o.m_rightSide;
}
virtual bool operator==(const CalcExpressionNode& o) const
{
return type() == o.type() && *this == static_cast<const CalcExpressionBinaryOperation&>(o);
}
virtual float evaluate(float) const;
private:
OwnPtr<CalcExpressionNode> m_leftSide;
OwnPtr<CalcExpressionNode> m_rightSide;
CalcOperator m_operator;
};
class CalcExpressionBlendLength : public CalcExpressionNode {
public:
CalcExpressionBlendLength(Length from, Length to, float progress)
: m_from(from)
, m_to(to)
, m_progress(progress)
{
m_type = CalcExpressionNodeBlendLength;
}
bool operator==(const CalcExpressionBlendLength& o) const
{
return m_progress == o.m_progress && m_from == o.m_from && m_to == o.m_to;
}
virtual bool operator==(const CalcExpressionNode& o) const
{
return type() == o.type() && *this == static_cast<const CalcExpressionBlendLength&>(o);
}
virtual float evaluate(float maxValue) const
{
return (1.0f - m_progress) * floatValueForLength(m_from, maxValue) + m_progress * floatValueForLength(m_to, maxValue);
}
private:
Length m_from;
Length m_to;
float m_progress;
};
} // namespace WebCore
#endif // CalculationValue_h
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