/* | |
* 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" | |
#if ENABLE(XPATH) | |
#include "Document.h" | |
#include "PlatformString.h" | |
#include "XPathException.h" | |
#include "XPathExpressionNode.h" | |
#include "XPathNSResolver.h" | |
#include "XPathParser.h" | |
#include "XPathResult.h" | |
#include "XPathUtil.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; | |
} | |
} | |
#endif // ENABLE(XPATH) |