Report column number in stack frame when debugger stops

This change causes the column number of the debugger's currently stopped
position to be passed through with the top stack frame.  This allows VS
Code's debugger UI to show an indicator that points to where the debugger
stopped when stepping through code.

Resolve PowerShell/vscode-powershell#616

Author: daviwil

src/PowerShellEditorServices.Protocol/DebugAdapter/StackFrame.cs

@@ -15,8 +15,12 @@ public class StackFrame
 
         public int Line { get; set; }
 
+        public int? EndLine { get; set; }
+
         public int Column { get; set; }
 
+        public int? EndColumn { get; set; }
+
         //        /** An identifier for the stack frame. */
         //id: number;
         ///** The name of the stack frame, typically a method name */
@@ -38,8 +42,10 @@ public static StackFrame Create(
             {
                 Id = id,
                 Name = stackFrame.FunctionName,
-                Line = stackFrame.LineNumber,
-                Column = stackFrame.ColumnNumber,
+                Line = stackFrame.StartLineNumber,
+                EndLine = stackFrame.EndLineNumber > 0 ? (int?)stackFrame.EndLineNumber : null,
+                Column = stackFrame.StartColumnNumber,
+                EndColumn = stackFrame.EndColumnNumber > 0 ? (int?)stackFrame.EndColumnNumber : null,
                 Source = new Source
                 {
                     Path = stackFrame.ScriptPath

src/PowerShellEditorServices.Protocol/DebugAdapter/StoppedEvent.cs

@@ -28,10 +28,6 @@ public class StoppedEventBody
 
         public Source Source { get; set; } 
 
-        public int Line { get; set; }
-
-        public int Column { get; set; }
-
         /// <summary>
         /// Gets or sets additional information such as an error message.
         /// </summary>

src/PowerShellEditorServices.Protocol/Server/DebugAdapter.cs

@@ -857,8 +857,6 @@ await this.SendEvent(
                     {
                         Path = e.ScriptPath,
                     },
-                    Line = e.LineNumber,
-                    Column = e.ColumnNumber,
                     ThreadId = 1,
                     Reason = debuggerStoppedReason
                 });

src/PowerShellEditorServices/Debugging/DebugService.cs

@@ -8,6 +8,7 @@
 using System.Linq;
 using System.Management.Automation;
 using System.Management.Automation.Language;
+using System.Reflection;
 using System.Text;
 using System.Threading.Tasks;
 using Microsoft.PowerShell.EditorServices.Debugging;
@@ -41,6 +42,7 @@ public class DebugService
         private VariableContainerDetails globalScopeVariables;
         private VariableContainerDetails scriptScopeVariables;
         private StackFrameDetails[] stackFrameDetails;
+        private PropertyInfo invocationTypeScriptPositionProperty;
 
         private static int breakpointHitCounter = 0;
 
@@ -81,6 +83,12 @@ public DebugService(
             this.powerShellContext.BreakpointUpdated += this.OnBreakpointUpdated;
 
             this.remoteFileManager = remoteFileManager;
+
+            this.invocationTypeScriptPositionProperty =
+                typeof(InvocationInfo)
+                    .GetProperty(
+                        "ScriptPosition",
+                        BindingFlags.NonPublic | BindingFlags.Instance);
         }
 
         #endregion
@@ -1100,6 +1108,22 @@ await this.remoteFileManager.FetchRemoteFile(
                         this.powerShellContext.CurrentRunspace);
             }
 
+            if (this.stackFrameDetails.Length > 0)
+            {
+                // Augment the top stack frame with details from the stop event
+                IScriptExtent scriptExtent =
+                    this.invocationTypeScriptPositionProperty
+                        .GetValue(e.InvocationInfo) as IScriptExtent;
+
+                if (scriptExtent != null)
+                {
+                    this.stackFrameDetails[0].StartLineNumber = scriptExtent.StartLineNumber;
+                    this.stackFrameDetails[0].EndLineNumber = scriptExtent.EndLineNumber;
+                    this.stackFrameDetails[0].StartColumnNumber = scriptExtent.StartColumnNumber;
+                    this.stackFrameDetails[0].EndColumnNumber = scriptExtent.EndColumnNumber;
+                }
+            }
+
             // Notify the host that the debugger is stopped
             this.DebuggerStopped?.Invoke(
                 sender,

src/PowerShellEditorServices/Debugging/StackFrameDetails.cs

@@ -35,15 +35,25 @@ public class StackFrameDetails
         /// </summary>
         public string FunctionName { get; private set; }
 
+        /// <summary>
+        /// Gets the start line number of the script where the stack frame occurred.
+        /// </summary>
+        public int StartLineNumber { get; internal set; }
+
         /// <summary>
         /// Gets the line number of the script where the stack frame occurred.
         /// </summary>
-        public int LineNumber { get; private set; }
+        public int EndLineNumber { get; internal set; }
+
+        /// <summary>
+        /// Gets the start column number of the line where the stack frame occurred.
+        /// </summary>
+        public int StartColumnNumber { get; internal set; }
 
         /// <summary>
-        /// Gets the column number of the line where the stack frame occurred.
+        /// Gets the end column number of the line where the stack frame occurred.
         /// </summary>
-        public int ColumnNumber { get; private set; }
+        public int EndColumnNumber { get; internal set; }
 
         /// <summary>
         /// Gets or sets the VariableContainerDetails that contains the auto variables.
@@ -82,8 +92,8 @@ static internal StackFrameDetails Create(
             {
                 ScriptPath = (callStackFrameObject.Properties["ScriptName"].Value as string) ?? NoFileScriptPath,
                 FunctionName = callStackFrameObject.Properties["FunctionName"].Value as string,
-                LineNumber = (int)(callStackFrameObject.Properties["ScriptLineNumber"].Value ?? 0),
-                ColumnNumber = 0,   // Column number isn't given in PowerShell stack frames
+                StartLineNumber = (int)(callStackFrameObject.Properties["ScriptLineNumber"].Value ?? 0),
+                StartColumnNumber = 0,   // Column number isn't given in PowerShell stack frames
                 AutoVariables = autoVariables,
                 LocalVariables = localVariables
             };