1 /*
2 * Copyright 2005 Frerich Raabe <raabe@kde.org>
3 * Copyright (C) 2006 Apple Computer, Inc.
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 #if ENABLE(XPATH)
31
32 #include "Node.h"
33 #include "XPathExpressionNode.h"
34 #include "XPathUtil.h"
35 #include <limits>
36 #include <wtf/MathExtras.h>
37 #include <wtf/StdLibExtras.h>
38
39 using std::numeric_limits;
40
41 namespace WebCore {
42 namespace XPath {
43
44 const Value::AdoptTag Value::adopt = {};
45
toNodeSet() const46 const NodeSet& Value::toNodeSet() const
47 {
48 if (!isNodeSet())
49 Expression::evaluationContext().hadTypeConversionError = true;
50
51 if (!m_data) {
52 DEFINE_STATIC_LOCAL(NodeSet, emptyNodeSet, ());
53 return emptyNodeSet;
54 }
55
56 return m_data->m_nodeSet;
57 }
58
modifiableNodeSet()59 NodeSet& Value::modifiableNodeSet()
60 {
61 if (!isNodeSet())
62 Expression::evaluationContext().hadTypeConversionError = true;
63
64 if (!m_data)
65 m_data = ValueData::create();
66
67 m_type = NodeSetValue;
68 return m_data->m_nodeSet;
69 }
70
toBoolean() const71 bool Value::toBoolean() const
72 {
73 switch (m_type) {
74 case NodeSetValue:
75 return !m_data->m_nodeSet.isEmpty();
76 case BooleanValue:
77 return m_bool;
78 case NumberValue:
79 return m_number != 0 && !isnan(m_number);
80 case StringValue:
81 return !m_data->m_string.isEmpty();
82 }
83 ASSERT_NOT_REACHED();
84 return false;
85 }
86
toNumber() const87 double Value::toNumber() const
88 {
89 switch (m_type) {
90 case NodeSetValue:
91 return Value(toString()).toNumber();
92 case NumberValue:
93 return m_number;
94 case StringValue: {
95 const String& str = m_data->m_string.simplifyWhiteSpace();
96
97 // String::toDouble() supports exponential notation, which is not allowed in XPath.
98 unsigned len = str.length();
99 for (unsigned i = 0; i < len; ++i) {
100 UChar c = str[i];
101 if (!isASCIIDigit(c) && c != '.' && c != '-')
102 return numeric_limits<double>::quiet_NaN();
103 }
104
105 bool canConvert;
106 double value = str.toDouble(&canConvert);
107 if (canConvert)
108 return value;
109 return numeric_limits<double>::quiet_NaN();
110 }
111 case BooleanValue:
112 return m_bool;
113 }
114 ASSERT_NOT_REACHED();
115 return 0.0;
116 }
117
toString() const118 String Value::toString() const
119 {
120 switch (m_type) {
121 case NodeSetValue:
122 if (m_data->m_nodeSet.isEmpty())
123 return "";
124 return stringValue(m_data->m_nodeSet.firstNode());
125 case StringValue:
126 return m_data->m_string;
127 case NumberValue:
128 if (isnan(m_number))
129 return "NaN";
130 if (m_number == 0)
131 return "0";
132 if (isinf(m_number))
133 return signbit(m_number) ? "-Infinity" : "Infinity";
134 return String::number(m_number);
135 case BooleanValue:
136 return m_bool ? "true" : "false";
137 }
138 ASSERT_NOT_REACHED();
139 return String();
140 }
141
142 }
143 }
144
145 #endif // ENABLE(XPATH)
146