Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

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

@@ -0,0 +1,81 @@
+//------------------------------------------------------------------------------
+// <copyright file="CopyCodeAction.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 System.Collections;
+
+    internal class CopyCodeAction : Action {
+        // Execution states:
+        private const int Outputting = 2;
+        
+        private ArrayList copyEvents;   // Copy code action events
+
+        internal CopyCodeAction() {
+            this.copyEvents = new ArrayList();
+        }
+
+        internal void AddEvent(Event copyEvent) {
+            this.copyEvents.Add(copyEvent);
+        }
+
+        internal void AddEvents(ArrayList copyEvents) {
+            Debug.Assert(copyEvents != null);
+            this.copyEvents.AddRange(copyEvents);
+        }
+
+        internal override void ReplaceNamespaceAlias(Compiler compiler) {
+            int count = this.copyEvents.Count;
+            for(int i = 0; i< count; i++) {
+                ((Event) this.copyEvents[i]).ReplaceNamespaceAlias(compiler);
+            }
+        }
+        
+        internal override void Execute(Processor processor, ActionFrame frame) {
+            Debug.Assert(processor != null && frame != null);
+            Debug.Assert(this.copyEvents != null && this.copyEvents.Count > 0);
+
+            switch (frame.State) {
+            case Initialized:
+                frame.Counter = 0;
+                frame.State   = Outputting;
+                goto case Outputting;
+
+            case Outputting:
+                Debug.Assert(frame.State == Outputting);
+
+                while (processor.CanContinue) {
+                    Debug.Assert(frame.Counter < this.copyEvents.Count);
+                    Event copyEvent = (Event) this.copyEvents[frame.Counter];
+
+                    if (copyEvent.Output(processor, frame) == false) {
+                        // This event wasn't processed
+                        break;
+                    }
+
+                    if (frame.IncrementCounter() >= this.copyEvents.Count) {
+                        frame.Finished();
+                        break;
+                    }
+                }
+                break;
+            default:
+                Debug.Fail("Invalid CopyCodeAction execution state");
+                break;
+            }
+        }
+
+        internal override DbgData GetDbgData(ActionFrame frame) {
+            Debug.Assert(frame.Counter < this.copyEvents.Count);
+            return ((Event)this.copyEvents[frame.Counter]).DbgData;        
+        }
+    }
+}