Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Data.SqlXml/System/Xml/Xsl/XsltOld/CopyNamespacesAction.cs

@@ -0,0 +1,82 @@
+//------------------------------------------------------------------------------
+// <copyright file="CopyNamespacesAction.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>                                                                
+// <owner current="true" primary="true">[....]</owner>
+//------------------------------------------------------------------------------
+
+namespace System.Xml.Xsl.XsltOld {
+    using Res = System.Xml.Utils.Res;
+    using System;
+    using System.Diagnostics;
+    using System.Xml;
+    using System.Xml.XPath;
+
+    internal sealed class CopyNamespacesAction : Action {
+        private const int BeginEvent    = 2;
+        private const int TextEvent     = 3;
+        private const int EndEvent      = 4;
+        private const int Advance       = 5;
+
+        private static CopyNamespacesAction s_Action = new CopyNamespacesAction();
+
+        internal static CopyNamespacesAction GetAction() {
+            Debug.Assert(s_Action != null);
+            return s_Action;
+        }
+
+        internal override void Execute(Processor processor, ActionFrame frame) {
+            Debug.Assert(processor != null && frame != null);
+
+            while (processor.CanContinue) {
+                switch (frame.State) {
+                case Initialized:
+                    if (frame.Node.MoveToFirstNamespace(XPathNamespaceScope.ExcludeXml) == false) {
+                        frame.Finished();
+                        break;
+                    }
+
+                    frame.State   = BeginEvent;
+                    goto case BeginEvent;
+
+                case BeginEvent:
+                    Debug.Assert(frame.State == BeginEvent);
+                    Debug.Assert(frame.Node.NodeType == XPathNodeType.Namespace);
+
+                    if (processor.BeginEvent(XPathNodeType.Namespace, null, frame.Node.LocalName, frame.Node.Value, false) == false) {
+                        // This one wasn't output
+                        break;
+                    }
+                    frame.State = EndEvent;
+                    continue;
+
+                case EndEvent:
+                    Debug.Assert(frame.State == EndEvent);
+                    Debug.Assert(frame.Node.NodeType == XPathNodeType.Namespace);
+
+                    if (processor.EndEvent(XPathNodeType.Namespace) == false) {
+                        // This one wasn't output
+                        break;
+                    }
+                    frame.State = Advance;
+                    continue;
+
+                case Advance:
+                    Debug.Assert(frame.State == Advance);
+                    Debug.Assert(frame.Node.NodeType == XPathNodeType.Namespace);
+
+                    if (frame.Node.MoveToNextNamespace(XPathNamespaceScope.ExcludeXml)) {
+                        frame.State = BeginEvent;
+                        continue;
+                    }
+                    else {
+                        frame.Node.MoveToParent();
+                        frame.Finished();
+                        break;
+                    }
+                }
+                break;
+            }// while
+        }
+    }
+}