1/*
2 * Copyright (C) 2011 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#include "config.h"
32#include "CalculationValue.h"
33
34#include <limits>
35
36namespace WebCore {
37
38float CalcExpressionBinaryOperation::evaluate(float maxValue) const
39{
40    float left = m_leftSide->evaluate(maxValue);
41    float right = m_rightSide->evaluate(maxValue);
42    switch (m_operator) {
43    case CalcAdd:
44        return left + right;
45    case CalcSubtract:
46        return left - right;
47    case CalcMultiply:
48        return left * right;
49    case CalcDivide:
50        if (!right)
51            return std::numeric_limits<float>::quiet_NaN();
52        return left / right;
53    }
54    ASSERT_NOT_REACHED();
55    return std::numeric_limits<float>::quiet_NaN();
56}
57
58PassRefPtr<CalculationValue> CalculationValue::create(PassOwnPtr<CalcExpressionNode> value, CalculationPermittedValueRange range)
59{
60    return adoptRef(new CalculationValue(value, range));
61}
62
63float CalculationValue::evaluate(float maxValue) const
64{
65    float result = m_value->evaluate(maxValue);
66    // FIXME calc https://webkit.org/b/80411 : result is NaN when there is a division
67    // by zero which isn't found at parse time.
68    if (std::isnan(result))
69        return 0;
70    return m_isNonNegative && result < 0 ? 0 : result;
71}
72
73} // namespace WebCore
74