1/*
2 * Copyright (C) 2011 Google Inc. All rights reserved.
3 * Copyright (C) 2014 Apple Inc. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met:
8 *
9 *     * Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *     * Redistributions in binary form must reproduce the above
12 * copyright notice, this list of conditions and the following disclaimer
13 * in the documentation and/or other materials provided with the
14 * distribution.
15 *     * Neither the name of Google Inc. nor the names of its
16 * contributors may be used to endorse or promote products derived from
17 * this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include "config.h"
33#include "CalculationValue.h"
34
35#include <limits>
36
37namespace WebCore {
38
39PassRef<CalculationValue> CalculationValue::create(std::unique_ptr<CalcExpressionNode> value, CalculationPermittedValueRange range)
40{
41    return adoptRef(*new CalculationValue(WTF::move(value), range));
42}
43
44float CalcExpressionNumber::evaluate(float) const
45{
46    return m_value;
47}
48
49bool CalcExpressionNumber::operator==(const CalcExpressionNode& other) const
50{
51    return other.type() == CalcExpressionNodeNumber && *this == toCalcExpressionNumber(other);
52}
53
54float CalculationValue::evaluate(float maxValue) const
55{
56    float result = m_expression->evaluate(maxValue);
57    // FIXME: This test was originally needed when we did not detect division by zero at parse time.
58    // It's possible that this is now unneeded code and can be removed.
59    if (std::isnan(result))
60        return 0;
61    return m_shouldClampToNonNegative && result < 0 ? 0 : result;
62}
63
64float CalcExpressionBinaryOperation::evaluate(float maxValue) const
65{
66    float left = m_leftSide->evaluate(maxValue);
67    float right = m_rightSide->evaluate(maxValue);
68    switch (m_operator) {
69    case CalcAdd:
70        return left + right;
71    case CalcSubtract:
72        return left - right;
73    case CalcMultiply:
74        return left * right;
75    case CalcDivide:
76        if (!right)
77            return std::numeric_limits<float>::quiet_NaN();
78        return left / right;
79    }
80    ASSERT_NOT_REACHED();
81    return std::numeric_limits<float>::quiet_NaN();
82}
83
84bool CalcExpressionBinaryOperation::operator==(const CalcExpressionNode& other) const
85{
86    return other.type() == CalcExpressionNodeBinaryOperation && *this == toCalcExpressionBinaryOperation(other);
87}
88
89float CalcExpressionLength::evaluate(float maxValue) const
90{
91    return floatValueForLength(m_length, maxValue);
92}
93
94bool CalcExpressionLength::operator==(const CalcExpressionNode& other) const
95{
96    return other.type() == CalcExpressionNodeLength && *this == toCalcExpressionLength(other);
97}
98
99float CalcExpressionBlendLength::evaluate(float maxValue) const
100{
101    return (1.0f - m_progress) * floatValueForLength(m_from, maxValue) + m_progress * floatValueForLength(m_to, maxValue);
102}
103
104bool CalcExpressionBlendLength::operator==(const CalcExpressionNode& other) const
105{
106    return other.type() == CalcExpressionNodeBlendLength && *this == toCalcExpressionBlendLength(other);
107}
108
109} // namespace WebCore
110