Merge Chromium + Blink git repositories
[chromium-blink-merge.git] / third_party / WebKit / Source / core / xml / XPathValue.cpp
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1 /*
2 * Copyright 2005 Frerich Raabe <raabe@kde.org>
3 * Copyright (C) 2006 Apple Computer, Inc.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
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.
27 #include "config.h"
28 #include "core/xml/XPathValue.h"
30 #include "core/xml/XPathExpressionNode.h"
31 #include "core/xml/XPathUtil.h"
32 #include "wtf/MathExtras.h"
33 #include "wtf/StdLibExtras.h"
34 #include <limits>
36 namespace blink {
37 namespace XPath {
39 const Value::AdoptTag Value::adopt = { };
41 DEFINE_TRACE(ValueData)
43 visitor->trace(m_nodeSet);
46 DEFINE_TRACE(Value)
48 visitor->trace(m_data);
51 const NodeSet& Value::toNodeSet(EvaluationContext* context) const
53 if (!isNodeSet() && context)
54 context->hadTypeConversionError = true;
56 if (!m_data) {
57 DEFINE_STATIC_LOCAL(Persistent<NodeSet>, emptyNodeSet, (NodeSet::create()));
58 return *emptyNodeSet;
61 return m_data->nodeSet();
64 NodeSet& Value::modifiableNodeSet(EvaluationContext& context)
66 if (!isNodeSet())
67 context.hadTypeConversionError = true;
69 if (!m_data)
70 m_data = ValueData::create();
72 m_type = NodeSetValue;
73 return m_data->nodeSet();
76 bool Value::toBoolean() const
78 switch (m_type) {
79 case NodeSetValue:
80 return !m_data->nodeSet().isEmpty();
81 case BooleanValue:
82 return m_bool;
83 case NumberValue:
84 return m_number && !std::isnan(m_number);
85 case StringValue:
86 return !m_data->m_string.isEmpty();
88 ASSERT_NOT_REACHED();
89 return false;
92 double Value::toNumber() const
94 switch (m_type) {
95 case NodeSetValue:
96 return Value(toString()).toNumber();
97 case NumberValue:
98 return m_number;
99 case StringValue: {
100 const String& str = m_data->m_string.simplifyWhiteSpace();
102 // String::toDouble() supports exponential notation, which is not
103 // allowed in XPath.
104 unsigned len = str.length();
105 for (unsigned i = 0; i < len; ++i) {
106 UChar c = str[i];
107 if (!isASCIIDigit(c) && c != '.' && c != '-')
108 return std::numeric_limits<double>::quiet_NaN();
111 bool canConvert;
112 double value = str.toDouble(&canConvert);
113 if (canConvert)
114 return value;
115 return std::numeric_limits<double>::quiet_NaN();
117 case BooleanValue:
118 return m_bool;
120 ASSERT_NOT_REACHED();
121 return 0.0;
124 String Value::toString() const
126 switch (m_type) {
127 case NodeSetValue:
128 if (m_data->nodeSet().isEmpty())
129 return "";
130 return stringValue(m_data->nodeSet().firstNode());
131 case StringValue:
132 return m_data->m_string;
133 case NumberValue:
134 if (std::isnan(m_number))
135 return "NaN";
136 if (m_number == 0)
137 return "0";
138 if (std::isinf(m_number))
139 return std::signbit(m_number) ? "-Infinity" : "Infinity";
140 return String::number(m_number);
141 case BooleanValue:
142 return m_bool ? "true" : "false";
144 ASSERT_NOT_REACHED();
145 return String();