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XPathValue.cpp
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137 lines (124 loc) · 4.26 KB
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/*
* Copyright 2005 Frerich Raabe <raabe@kde.org>
* Copyright (C) 2006-2026 Apple Inc. All rights reserved.
*
* 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 "CommonAtomStrings.h"
#include "XPathExpressionNode.h"
#include "XPathUtil.h"
#include <limits>
#include <wtf/MathExtras.h>
#include <wtf/NeverDestroyed.h>
#include <wtf/StdLibExtras.h>
namespace WebCore::XPath {
const NodeSet& Value::toNodeSet() const
{
if (!isNodeSet()) {
Expression::evaluationContext().hadTypeConversionError = true;
static NeverDestroyed<NodeSet> emptyNodeSet;
return emptyNodeSet;
}
return std::get<Ref<NodeSetHolder>>(m_value)->nodeSet;
}
NodeSet& Value::modifiableNodeSet()
{
if (!isNodeSet()) {
Expression::evaluationContext().hadTypeConversionError = true;
m_value = NodeSetHolder::create(NodeSet { });
}
return std::get<Ref<NodeSetHolder>>(m_value)->nodeSet;
}
bool Value::toBoolean() const
{
return switchOn(
[](bool value) {
return value;
},
[](double value) {
return value && !std::isnan(value);
},
[](const String& string) {
return !string.isEmpty();
},
[](const NodeSet& nodeSet) {
return !nodeSet.isEmpty();
}
);
}
double Value::toNumber() const
{
return switchOn(
[](bool value) -> double {
return value;
},
[](double value) {
return value;
},
[](const String& string) -> double {
auto simplified = string.simplifyWhiteSpace(deprecatedIsSpaceOrNewline);
// String::toDouble() supports exponential notation, which is not allowed in XPath.
unsigned len = simplified.length();
for (unsigned i = 0; i < len; ++i) {
char16_t c = simplified[i];
if (!isASCIIDigit(c) && c != '.' && c != '-')
return std::numeric_limits<double>::quiet_NaN();
}
bool canConvert;
auto value = simplified.toDouble(&canConvert);
if (canConvert)
return value;
return std::numeric_limits<double>::quiet_NaN();
},
[this](const NodeSet&) {
return Value(toString()).toNumber();
}
);
}
String Value::toString() const
{
return switchOn(
[](bool value) -> String {
return value ? trueAtom() : falseAtom();
},
[](double value) -> String {
if (std::isnan(value))
return "NaN"_s;
if (!value)
return "0"_s;
if (std::isinf(value))
return std::signbit(value) ? "-Infinity"_s : "Infinity"_s;
return String::number(value);
},
[](const String& string) {
return string;
},
[](const NodeSet& nodeSet) -> String {
if (nodeSet.isEmpty())
return emptyString();
return stringValue(Ref { *nodeSet.firstNode() });
}
);
}
} // namespace WebCore::XPath