Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

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

@@ -0,0 +1,53 @@
+//------------------------------------------------------------------------------
+// <copyright file="CommentAction.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 class CommentAction : ContainerAction {
+        internal override void Compile(Compiler compiler) {
+            CompileAttributes(compiler);
+
+            if (compiler.Recurse()) {
+                CompileTemplate(compiler);
+                compiler.ToParent();
+            }
+        }
+
+        internal override void Execute(Processor processor, ActionFrame frame) {
+            Debug.Assert(processor != null && frame != null);
+
+            switch (frame.State) {
+            case Initialized:
+                if (processor.BeginEvent(XPathNodeType.Comment, string.Empty, string.Empty, string.Empty, false) == false) {
+                    // Come back later
+                    break;
+                }
+
+                processor.PushActionFrame(frame);
+                frame.State = ProcessingChildren;
+                break;                              // Allow children to run
+
+            case ProcessingChildren:
+                if (processor.EndEvent(XPathNodeType.Comment) == false) {
+                    break;
+                }
+
+                frame.Finished();
+                break;
+
+            default:
+                Debug.Fail("Invalid IfAction execution state");
+    		    break;
+            }
+        }
+    }
+}