--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/xml/XPathExpression.cpp	Fri Sep 17 09:02:29 2010 +0300
@@ -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)