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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 "core/xml/XPathExpression.h"
#include "bindings/v8/ExceptionState.h"
#include "core/dom/ExceptionCode.h"
#include "core/xml/XPathExpressionNode.h"
#include "core/xml/XPathNSResolver.h"
#include "core/xml/XPathParser.h"
#include "core/xml/XPathResult.h"
#include "core/xml/XPathUtil.h"
#include "wtf/text/WTFString.h"
namespace WebCore {
using namespace XPath;
PassRefPtr<XPathExpression> XPathExpression::createExpression(const String& expression, PassRefPtr<XPathNSResolver> resolver, ExceptionState& exceptionState)
{
RefPtr<XPathExpression> expr = XPathExpression::create();
Parser parser;
expr->m_topExpression = parser.parseStatement(expression, resolver, exceptionState);
if (!expr->m_topExpression)
return 0;
return expr.release();
}
XPathExpression::~XPathExpression()
{
delete m_topExpression;
}
PassRefPtr<XPathResult> XPathExpression::evaluate(Node* contextNode, unsigned short type, XPathResult*, ExceptionState& exceptionState)
{
if (!contextNode) {
exceptionState.throwDOMException(NotSupportedError, "The context node provided is null.");
return 0;
}
if (!isValidContextNode(contextNode)) {
exceptionState.throwDOMException(NotSupportedError, "The node provided is '" + contextNode->nodeName() + "', which is not a valid context node type.");
return 0;
}
EvaluationContext& evaluationContext = Expression::evaluationContext();
evaluationContext.node = contextNode;
evaluationContext.size = 1;
evaluationContext.position = 1;
evaluationContext.hadTypeConversionError = false;
RefPtr<XPathResult> result = XPathResult::create(&contextNode->document(), m_topExpression->evaluate());
evaluationContext.node = 0; // Do not hold a reference to the context node, as this may prevent the whole document from being destroyed in time.
if (evaluationContext.hadTypeConversionError) {
// It is not specified what to do if type conversion fails while evaluating an expression.
exceptionState.throwDOMException(SyntaxError, "Type conversion failed while evaluating the expression.");
return 0;
}
if (type != XPathResult::ANY_TYPE) {
result->convertTo(type, exceptionState);
if (exceptionState.hadException())
return 0;
}
return result;
}
}
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