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/*
* Copyright 2005 Frerich Raabe <raabe@kde.org>
* Copyright (C) 2006 Apple Computer, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "XPathValue.h"
#include "Node.h"
#include "XPathExpressionNode.h"
#include "XPathUtil.h"
#include <limits>
#include <wtf/MathExtras.h>
#include <wtf/StdLibExtras.h>
using std::numeric_limits;
namespace WebCore {
namespace XPath {
const Value::AdoptTag Value::adopt = {};
const NodeSet& Value::toNodeSet() const
{
if (!isNodeSet())
Expression::evaluationContext().hadTypeConversionError = true;
if (!m_data) {
DEFINE_STATIC_LOCAL(NodeSet, emptyNodeSet, ());
return emptyNodeSet;
}
return m_data->m_nodeSet;
}
NodeSet& Value::modifiableNodeSet()
{
if (!isNodeSet())
Expression::evaluationContext().hadTypeConversionError = true;
if (!m_data)
m_data = ValueData::create();
m_type = NodeSetValue;
return m_data->m_nodeSet;
}
bool Value::toBoolean() const
{
switch (m_type) {
case NodeSetValue:
return !m_data->m_nodeSet.isEmpty();
case BooleanValue:
return m_bool;
case NumberValue:
return m_number && !std::isnan(m_number);
case StringValue:
return !m_data->m_string.isEmpty();
}
ASSERT_NOT_REACHED();
return false;
}
double Value::toNumber() const
{
switch (m_type) {
case NodeSetValue:
return Value(toString()).toNumber();
case NumberValue:
return m_number;
case StringValue: {
const String& str = m_data->m_string.simplifyWhiteSpace();
// String::toDouble() supports exponential notation, which is not allowed in XPath.
unsigned len = str.length();
for (unsigned i = 0; i < len; ++i) {
UChar c = str[i];
if (!isASCIIDigit(c) && c != '.' && c != '-')
return numeric_limits<double>::quiet_NaN();
}
bool canConvert;
double value = str.toDouble(&canConvert);
if (canConvert)
return value;
return numeric_limits<double>::quiet_NaN();
}
case BooleanValue:
return m_bool;
}
ASSERT_NOT_REACHED();
return 0.0;
}
String Value::toString() const
{
switch (m_type) {
case NodeSetValue:
if (m_data->m_nodeSet.isEmpty())
return "";
return stringValue(m_data->m_nodeSet.firstNode());
case StringValue:
return m_data->m_string;
case NumberValue:
if (std::isnan(m_number))
return "NaN";
if (m_number == 0)
return "0";
if (std::isinf(m_number))
return std::signbit(m_number) ? "-Infinity" : "Infinity";
return String::number(m_number);
case BooleanValue:
return m_bool ? "true" : "false";
}
ASSERT_NOT_REACHED();
return String();
}
}
}
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