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Diffstat (limited to 'Source/WebCore/xml/XPathExpression.cpp')
-rw-r--r-- | Source/WebCore/xml/XPathExpression.cpp | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/Source/WebCore/xml/XPathExpression.cpp b/Source/WebCore/xml/XPathExpression.cpp new file mode 100644 index 0000000..6188426 --- /dev/null +++ b/Source/WebCore/xml/XPathExpression.cpp @@ -0,0 +1,96 @@ +/* + * 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) |