1/*
2 * Copyright 2005 Frerich Raabe <raabe@kde.org>
3 * Copyright (C) 2006, 2013 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
7 * are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include "config.h"
28#include "XPathValue.h"
29
30#include "XPathExpressionNode.h"
31#include "XPathUtil.h"
32#include <limits>
33#include <wtf/MathExtras.h>
34#include <wtf/NeverDestroyed.h>
35#include <wtf/StdLibExtras.h>
36
37namespace WebCore {
38namespace XPath {
39
40const NodeSet& Value::toNodeSet() const
41{
42 if (!isNodeSet())
43 Expression::evaluationContext().hadTypeConversionError = true;
44
45 if (!m_data) {
46 static NeverDestroyed<NodeSet> emptyNodeSet;
47 return emptyNodeSet;
48 }
49
50 return m_data->nodeSet;
51}
52
53NodeSet& Value::modifiableNodeSet()
54{
55 if (!isNodeSet())
56 Expression::evaluationContext().hadTypeConversionError = true;
57
58 if (!m_data)
59 m_data = Data::create();
60
61 m_type = NodeSetValue;
62 return m_data->nodeSet;
63}
64
65bool Value::toBoolean() const
66{
67 switch (m_type) {
68 case NodeSetValue:
69 return !m_data->nodeSet.isEmpty();
70 case BooleanValue:
71 return m_bool;
72 case NumberValue:
73 return m_number && !std::isnan(m_number);
74 case StringValue:
75 return !m_data->string.isEmpty();
76 }
77 ASSERT_NOT_REACHED();
78 return false;
79}
80
81double Value::toNumber() const
82{
83 switch (m_type) {
84 case NodeSetValue:
85 return Value(toString()).toNumber();
86 case NumberValue:
87 return m_number;
88 case StringValue: {
89 const String& str = m_data->string.simplifyWhiteSpace();
90
91 // String::toDouble() supports exponential notation, which is not allowed in XPath.
92 unsigned len = str.length();
93 for (unsigned i = 0; i < len; ++i) {
94 UChar c = str[i];
95 if (!isASCIIDigit(c) && c != '.' && c != '-')
96 return std::numeric_limits<double>::quiet_NaN();
97 }
98
99 bool canConvert;
100 double value = str.toDouble(&canConvert);
101 if (canConvert)
102 return value;
103 return std::numeric_limits<double>::quiet_NaN();
104 }
105 case BooleanValue:
106 return m_bool;
107 }
108
109 ASSERT_NOT_REACHED();
110 return 0.0;
111}
112
113String Value::toString() const
114{
115 switch (m_type) {
116 case NodeSetValue:
117 if (m_data->nodeSet.isEmpty())
118 return emptyString();
119 return stringValue(m_data->nodeSet.firstNode());
120 case StringValue:
121 return m_data->string;
122 case NumberValue:
123 if (std::isnan(m_number))
124 return "NaN"_s;
125 if (m_number == 0)
126 return "0"_s;
127 if (std::isinf(m_number))
128 return std::signbit(m_number) ? "-Infinity"_s : "Infinity"_s;
129 return String::numberToStringFixedPrecision(m_number);
130 case BooleanValue:
131 return m_bool ? "true"_s : "false"_s;
132 }
133
134 ASSERT_NOT_REACHED();
135 return String();
136}
137
138}
139}
140