Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

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

@@ -0,0 +1,33 @@
+//------------------------------------------------------------------------------
+// <copyright file="XsltDebugger.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>                                                                
+// <owner current="true" primary="true">sdub</owner>
+//------------------------------------------------------------------------------
+
+namespace System.Xml.Xsl.XsltOld.Debugger {
+    using Res = System.Xml.Utils.Res;
+    using System;
+    using System.Xml;
+    using System.Xml.XPath;
+    
+    internal interface IStackFrame {
+        XPathNavigator    Instruction     { get; }
+        XPathNodeIterator NodeSet         { get; }
+        // Variables:
+        int               GetVariablesCount();
+        XPathNavigator    GetVariable(int varIndex);
+        object            GetVariableValue(int varIndex);
+    }
+
+    internal interface IXsltProcessor {
+        int         StackDepth { get; }
+        IStackFrame GetStackFrame(int depth);
+    }
+
+    internal interface IXsltDebugger {
+        string GetBuiltInTemplatesUri();
+        void   OnInstructionCompile(XPathNavigator styleSheetNavigator);
+        void   OnInstructionExecute(IXsltProcessor xsltProcessor);
+    }
+}