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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 "ExceptionCode.h"
#include "XPathException.h"
#include "XPathExpressionNode.h"
#include "XPathNSResolver.h"
#include "XPathParser.h"
#include "XPathResult.h"
#include "XPathUtil.h"
#include <wtf/text/WTFString.h>
namespace WebCore {
using namespace XPath;
PassRefPtr<XPathExpression> XPathExpression::createExpression(const String& expression, XPathNSResolver* resolver, ExceptionCode& ec)
{
RefPtr<XPathExpression> expr = XPathExpression::create();
Parser parser;
expr->m_topExpression = parser.parseStatement(expression, resolver, ec);
if (!expr->m_topExpression)
return 0;
return expr.release();
}
XPathExpression::~XPathExpression()
{
delete m_topExpression;
}
PassRefPtr<XPathResult> XPathExpression::evaluate(Node* contextNode, unsigned short type, XPathResult*, ExceptionCode& ec)
{
if (!isValidContextNode(contextNode)) {
ec = NOT_SUPPORTED_ERR;
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, and INVALID_EXPRESSION_ERR is not exactly right
// when the failure happens in an otherwise valid expression because of a variable. But XPathEvaluator does not support variables, so it's close enough.
ec = XPathException::INVALID_EXPRESSION_ERR;
return 0;
}
if (type != XPathResult::ANY_TYPE) {
ec = 0;
result->convertTo(type, ec);
if (ec)
return 0;
}
return result;
}
}
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