Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

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

@@ -0,0 +1,87 @@
+//------------------------------------------------------------------------------
+// <copyright file="CopyOfAction.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;
+    using MS.Internal.Xml.XPath;
+
+    internal class CopyOfAction : CompiledAction {
+        private const int ResultStored  = 2;
+        private const int NodeSetCopied = 3;
+
+        private int    selectKey   = Compiler.InvalidQueryKey;
+
+        internal override void Compile(Compiler compiler) {
+            CompileAttributes(compiler);
+            CheckRequiredAttribute(compiler, selectKey != Compiler.InvalidQueryKey, "select");
+            CheckEmpty(compiler);
+        }
+
+        internal override bool CompileAttribute(Compiler compiler) {
+            string name   = compiler.Input.LocalName;
+            string value  = compiler.Input.Value;
+            if (Ref.Equal(name, compiler.Atoms.Select)) {
+                this.selectKey = compiler.AddQuery(value);
+            }
+            else {
+                return false;
+            }
+
+            return true;
+        }
+
+        internal override void Execute(Processor processor, ActionFrame frame) {
+            Debug.Assert(processor != null && frame != null);
+
+            switch (frame.State) {
+            case Initialized:
+                Debug.Assert(frame.NodeSet != null);
+                Query query = processor.GetValueQuery(this.selectKey);
+                object result = query.Evaluate(frame.NodeSet);
+
+                if (result is XPathNodeIterator) {
+                    // we cash this query because otherwise current() works incorrectly. Bug#382166.
+                    // To be perfect we should use frame.NewNodeSet here
+                    processor.PushActionFrame(CopyNodeSetAction.GetAction(), new XPathArrayIterator(query));
+                    frame.State = NodeSetCopied;
+                    break;
+                }
+
+                XPathNavigator nav = result as XPathNavigator;
+                if (nav != null) {
+                    processor.PushActionFrame(CopyNodeSetAction.GetAction(), new XPathSingletonIterator(nav));
+                    frame.State = NodeSetCopied;
+                    break; 
+                }
+
+                string value = XmlConvert.ToXPathString(result);
+                if (processor.TextEvent(value)) {
+                    frame.Finished();
+                } else {
+                    frame.StoredOutput = value;
+                    frame.State        = ResultStored;
+                }
+                break;
+
+            case ResultStored:
+                Debug.Assert(frame.StoredOutput != null);
+                processor.TextEvent(frame.StoredOutput);
+                frame.Finished();
+                break;
+
+            case NodeSetCopied:
+                Debug.Assert(frame.State == NodeSetCopied);
+                frame.Finished();
+                break;
+            }
+        }
+    }
+}