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/*
* Copyright (C) 2005 Frerich Raabe <raabe@kde.org>
* Copyright (C) 2006, 2009 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 "XPathExpression.h"
#include "Document.h"
#include "XPathNSResolver.h"
#include "XPathParser.h"
#include "XPathResult.h"
#include "XPathUtil.h"
namespace WebCore {
inline XPathExpression::XPathExpression(std::unique_ptr<XPath::Expression> expression)
: m_topExpression(WTFMove(expression))
{
}
ExceptionOr<Ref<XPathExpression>> XPathExpression::createExpression(const String& expression, RefPtr<XPathNSResolver>&& resolver)
{
auto parseResult = XPath::Parser::parseStatement(expression, WTFMove(resolver));
if (parseResult.hasException())
return parseResult.releaseException();
return adoptRef(*new XPathExpression(parseResult.releaseReturnValue()));
}
XPathExpression::~XPathExpression() = default;
// FIXME: Why does this take an XPathResult that it ignores?
ExceptionOr<Ref<XPathResult>> XPathExpression::evaluate(Node& contextNode, unsigned short type, XPathResult*)
{
if (!XPath::isValidContextNode(contextNode))
return Exception { NotSupportedError };
auto& evaluationContext = XPath::Expression::evaluationContext();
evaluationContext.node = &contextNode;
evaluationContext.size = 1;
evaluationContext.position = 1;
evaluationContext.hadTypeConversionError = false;
auto result = XPathResult::create(contextNode.document(), m_topExpression->evaluate());
evaluationContext.node = nullptr; // Do not hold a reference to the context node, as this may prevent the whole document from being destroyed in time.
if (evaluationContext.hadTypeConversionError)
return Exception { SyntaxError };
if (type != XPathResult::ANY_TYPE) {
auto convertToResult = result->convertTo(type);
if (convertToResult.hasException())
return convertToResult.releaseException();
}
return result;
}
}
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