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/*
* Copyright (C) 2011 Google Inc. All rights reserved.
* Copyright (C) 2014 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:
*
* * 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.
*/
#include "config.h"
#include "CalculationValue.h"
#include "CalcExpressionNode.h"
#include <limits>
#include <wtf/text/TextStream.h>
namespace WebCore {
Ref<CalculationValue> CalculationValue::create(std::unique_ptr<CalcExpressionNode> value, ValueRange range)
{
return adoptRef(*new CalculationValue(WTFMove(value), range));
}
CalculationValue::CalculationValue(std::unique_ptr<CalcExpressionNode> expression, ValueRange range)
: m_expression(WTFMove(expression))
, m_shouldClampToNonNegative(range == ValueRange::NonNegative)
{
}
CalculationValue::~CalculationValue() = default;
float CalculationValue::evaluate(float maxValue) const
{
float result = m_expression->evaluate(maxValue);
// FIXME: This test was originally needed when we did not detect division by zero at parse time.
// It's possible that this is now unneeded code and can be removed.
if (std::isnan(result))
return 0;
return m_shouldClampToNonNegative && result < 0 ? 0 : result;
}
bool operator==(const CalculationValue& a, const CalculationValue& b)
{
return a.expression() == b.expression();
}
TextStream& operator<<(TextStream& ts, const CalculationValue& value)
{
return ts << "calc(" << value.expression() << ")";
}
} // namespace WebCore
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