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 ASCIILiteral("NaN"); 125 if (m_number == 0) 126 return ASCIILiteral("0"); 127 if (std::isinf(m_number)) 128 return ASCIILiteral(std::signbit(m_number) ? "-Infinity" : "Infinity"); 129 return String::number(m_number); 130 case BooleanValue: 131 return ASCIILiteral(m_bool ? "true" : "false"); 132 } 133 134 ASSERT_NOT_REACHED(); 135 return String(); 136} 137 138} 139} 140