Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

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

@@ -0,0 +1,70 @@
+//------------------------------------------------------------------------------
+// <copyright file="newinstructionaction.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 NewInstructionAction : ContainerAction {
+        string name;
+        string parent;
+        bool fallback;
+        
+        internal override void Compile(Compiler compiler) {
+            XPathNavigator nav = compiler.Input.Navigator.Clone();
+            name = nav.Name;
+            nav.MoveToParent();
+            parent = nav.Name;
+            if (compiler.Recurse()) {
+                CompileSelectiveTemplate(compiler);
+                compiler.ToParent();
+            }
+        }
+
+        internal void CompileSelectiveTemplate(Compiler compiler){
+            NavigatorInput input = compiler.Input;
+            do{
+                if (Ref.Equal(input.NamespaceURI, input.Atoms.UriXsl) &&
+                    Ref.Equal(input.LocalName, input.Atoms.Fallback)){
+                    fallback = true;
+                    if (compiler.Recurse()){
+                        CompileTemplate(compiler);
+                        compiler.ToParent();
+                    }
+                }
+            }
+            while (compiler.Advance());
+        }
+        
+       internal override void Execute(Processor processor, ActionFrame frame) {
+            Debug.Assert(processor != null && frame != null);
+
+            switch (frame.State) {
+            case Initialized:
+                if (!fallback) {
+                    throw XsltException.Create(Res.Xslt_UnknownExtensionElement, this.name);
+                }
+                if (this.containedActions != null && this.containedActions.Count > 0) {
+                    processor.PushActionFrame(frame);
+                    frame.State = ProcessingChildren;
+                    break;
+                }
+                else goto case ProcessingChildren;
+            case ProcessingChildren:
+                frame.Finished();
+                break;
+
+            default:
+                Debug.Fail("Invalid Container action execution state");
+                break;
+            }
+        }
+    }
+}