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/*
* Copyright (C) 2021 Apple 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:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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.
*/
#include "config.h"
#include "CalcExpressionOperation.h"
#include <wtf/text/TextStream.h>
namespace WebCore {
float CalcExpressionOperation::evaluate(float maxValue) const
{
switch (m_operator) {
case CalcOperator::Add: {
float sum = 0;
for (auto& child : m_children)
sum += child->evaluate(maxValue);
return sum;
}
case CalcOperator::Subtract: {
// FIXME
ASSERT(m_children.size() == 2);
float left = m_children[0]->evaluate(maxValue);
float right = m_children[1]->evaluate(maxValue);
return left - right;
}
case CalcOperator::Multiply: {
float product = 1;
for (auto& child : m_children)
product *= child->evaluate(maxValue);
return product;
}
case CalcOperator::Divide: {
// FIXME
ASSERT(m_children.size() == 1 || m_children.size() == 2);
if (m_children.size() == 1)
return std::numeric_limits<float>::quiet_NaN();
float left = m_children[0]->evaluate(maxValue);
float right = m_children[1]->evaluate(maxValue);
return left / right;
}
case CalcOperator::Min: {
if (m_children.isEmpty())
return std::numeric_limits<float>::quiet_NaN();
float minimum = m_children[0]->evaluate(maxValue);
for (auto& child : m_children)
minimum = std::min(minimum, child->evaluate(maxValue));
return minimum;
}
case CalcOperator::Max: {
if (m_children.isEmpty())
return std::numeric_limits<float>::quiet_NaN();
float maximum = m_children[0]->evaluate(maxValue);
for (auto& child : m_children)
maximum = std::max(maximum, child->evaluate(maxValue));
return maximum;
}
case CalcOperator::Clamp: {
if (m_children.size() != 3)
return std::numeric_limits<float>::quiet_NaN();
float min = m_children[0]->evaluate(maxValue);
float value = m_children[1]->evaluate(maxValue);
float max = m_children[2]->evaluate(maxValue);
return std::max(min, std::min(value, max));
}
}
ASSERT_NOT_REACHED();
return std::numeric_limits<float>::quiet_NaN();
}
bool CalcExpressionOperation::operator==(const CalcExpressionNode& other) const
{
return is<CalcExpressionOperation>(other) && *this == downcast<CalcExpressionOperation>(other);
}
bool operator==(const CalcExpressionOperation& a, const CalcExpressionOperation& b)
{
if (a.getOperator() != b.getOperator() || a.destinationCategory() != b.destinationCategory())
return false;
if (a.children().size() != b.children().size())
return false;
for (unsigned i = 0; i < a.children().size(); ++i) {
if (!(*a.children()[i] == *b.children()[i]))
return false;
}
return true;
}
void CalcExpressionOperation::dump(TextStream& ts) const
{
if (m_operator == CalcOperator::Min || m_operator == CalcOperator::Max) {
ts << m_operator << "(";
size_t childrenCount = m_children.size();
for (size_t i = 0; i < childrenCount; i++) {
ts << m_children[i].get();
if (i < childrenCount - 1)
ts << ", ";
}
ts << ")";
} else
ts << m_children[0].get() << " " << m_operator << " " << m_children[1].get();
}
}
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