--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/xml/XPathValue.cpp	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,145 @@
+/*
+ * Copyright 2005 Frerich Raabe <raabe@kde.org>
+ * Copyright (C) 2006 Apple Computer, Inc.
+ *
+ * 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 "XPathValue.h"
+
+#if ENABLE(XPATH)
+
+#include "Node.h"
+#include "XPathExpressionNode.h"
+#include "XPathUtil.h"
+#include <limits>
+#include <wtf/MathExtras.h>
+#include <wtf/StdLibExtras.h>
+
+using std::numeric_limits;
+
+namespace WebCore {
+namespace XPath {
+
+const Value::AdoptTag Value::adopt = {};
+
+const NodeSet& Value::toNodeSet() const
+{
+    if (!isNodeSet())
+        Expression::evaluationContext().hadTypeConversionError = true;
+
+    if (!m_data) {
+        DEFINE_STATIC_LOCAL(NodeSet, emptyNodeSet, ());
+        return emptyNodeSet;
+    }
+
+    return m_data->m_nodeSet;
+}    
+
+NodeSet& Value::modifiableNodeSet()
+{
+    if (!isNodeSet())
+        Expression::evaluationContext().hadTypeConversionError = true;
+
+    if (!m_data)
+        m_data = ValueData::create();
+    
+    m_type = NodeSetValue;
+    return m_data->m_nodeSet;
+}
+
+bool Value::toBoolean() const
+{
+    switch (m_type) {
+        case NodeSetValue:
+            return !m_data->m_nodeSet.isEmpty();
+        case BooleanValue:
+            return m_bool;
+        case NumberValue:
+            return m_number != 0 && !isnan(m_number);
+        case StringValue:
+            return !m_data->m_string.isEmpty();
+    }
+    ASSERT_NOT_REACHED();
+    return false;
+}
+
+double Value::toNumber() const
+{
+    switch (m_type) {
+        case NodeSetValue:
+            return Value(toString()).toNumber();
+        case NumberValue:
+            return m_number;
+        case StringValue: {
+            const String& str = m_data->m_string.simplifyWhiteSpace();
+
+            // String::toDouble() supports exponential notation, which is not allowed in XPath.
+            unsigned len = str.length();
+            for (unsigned i = 0; i < len; ++i) {
+                UChar c = str[i];
+                if (!isASCIIDigit(c) && c != '.'  && c != '-')
+                    return numeric_limits<double>::quiet_NaN();
+            }
+
+            bool canConvert;
+            double value = str.toDouble(&canConvert);
+            if (canConvert)
+                return value;
+            return numeric_limits<double>::quiet_NaN();
+        }
+        case BooleanValue:
+            return m_bool;
+    }
+    ASSERT_NOT_REACHED();
+    return 0.0;
+}
+
+String Value::toString() const
+{
+    switch (m_type) {
+        case NodeSetValue:
+            if (m_data->m_nodeSet.isEmpty()) 
+                return "";
+            return stringValue(m_data->m_nodeSet.firstNode());
+        case StringValue:
+            return m_data->m_string;
+        case NumberValue:
+            if (isnan(m_number))
+                return "NaN";
+            if (m_number == 0)
+                return "0";
+            if (isinf(m_number))
+                return signbit(m_number) ? "-Infinity" : "Infinity";
+            return String::number(m_number);
+        case BooleanValue:
+            return m_bool ? "true" : "false";
+    }
+    ASSERT_NOT_REACHED();
+    return String();
+}
+
+}
+}
+
+#endif // ENABLE(XPATH)