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/*
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* Copyright (C) 2005 Frerich Raabe <raabe@kde.org>
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* Copyright (C) 2006, 2009 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "XPathExpression.h"
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#if ENABLE(XPATH)
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#include "Document.h"
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#include "PlatformString.h"
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#include "XPathException.h"
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#include "XPathExpressionNode.h"
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#include "XPathNSResolver.h"
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#include "XPathParser.h"
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#include "XPathResult.h"
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#include "XPathUtil.h"
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namespace WebCore {
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using namespace XPath;
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PassRefPtr<XPathExpression> XPathExpression::createExpression(const String& expression, XPathNSResolver* resolver, ExceptionCode& ec)
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{
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RefPtr<XPathExpression> expr = XPathExpression::create();
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Parser parser;
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expr->m_topExpression = parser.parseStatement(expression, resolver, ec);
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if (!expr->m_topExpression)
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return 0;
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return expr.release();
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}
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XPathExpression::~XPathExpression()
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{
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delete m_topExpression;
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}
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PassRefPtr<XPathResult> XPathExpression::evaluate(Node* contextNode, unsigned short type, XPathResult*, ExceptionCode& ec)
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{
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if (!isValidContextNode(contextNode)) {
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ec = NOT_SUPPORTED_ERR;
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return 0;
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}
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EvaluationContext& evaluationContext = Expression::evaluationContext();
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evaluationContext.node = contextNode;
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evaluationContext.size = 1;
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evaluationContext.position = 1;
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evaluationContext.hadTypeConversionError = false;
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RefPtr<XPathResult> result = XPathResult::create(contextNode->document(), m_topExpression->evaluate());
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evaluationContext.node = 0; // Do not hold a reference to the context node, as this may prevent the whole document from being destroyed in time.
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if (evaluationContext.hadTypeConversionError) {
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// It is not specified what to do if type conversion fails while evaluating an expression, and INVALID_EXPRESSION_ERR is not exactly right
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// when the failure happens in an otherwise valid expression because of a variable. But XPathEvaluator does not support variables, so it's close enough.
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ec = XPathException::INVALID_EXPRESSION_ERR;
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return 0;
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}
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if (type != XPathResult::ANY_TYPE) {
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ec = 0;
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result->convertTo(type, ec);
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if (ec)
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return 0;
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}
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return result;
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}
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}
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#endif // ENABLE(XPATH)
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