diff --git a/ConsoleDemo/ConsoleDemo.csproj b/ConsoleDemo/ConsoleDemo.csproj
index 1346ca7..a40909a 100644
--- a/ConsoleDemo/ConsoleDemo.csproj
+++ b/ConsoleDemo/ConsoleDemo.csproj
@@ -5,6 +5,7 @@
   </PropertyGroup>
   <ItemGroup>
     <ProjectReference Include="..\Parser\Parser.csproj" />
+    <ProjectReference Include="..\Repl\Repl.csproj" />
     <ProjectReference Include="..\Semantics\Semantics.csproj" />
   </ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/ConsoleDemo/Program.cs b/ConsoleDemo/Program.cs
index b46404d..8f74c47 100644
--- a/ConsoleDemo/Program.cs
+++ b/ConsoleDemo/Program.cs
@@ -1,52 +1,12 @@
-using System;
-using System.Collections.Generic;
-using System.Diagnostics;
+using Parser;
+using Semantics;
+using System;
 using System.IO;
 using System.Linq;
-using Parser;
-using ProjectConsole;
-using Semantics;
+using Repl;
 
 namespace ConsoleDemo
 {
-    internal class TreeRenderer
-    {
-        private static void RenderToken(SyntaxToken token, string indent, bool isLast)
-        {
-            Console.Write(indent + (isLast ? "└── " : "├── "));
-            Console.Write($"<{token.Kind}>");
-            Console.Write($" {token.Text}");
-            Console.WriteLine();
-        }
-
-        private static void RenderNode(SyntaxNode node, string indent, bool isLast)
-        {
-            Console.Write(indent);
-            Console.Write(isLast ? "└── " : "├── ");
-            Console.Write($"<{node.Kind}>");
-            Console.WriteLine();
-            var children = node.GetChildNodesAndTokens();
-            var last = children.Count - 1;
-            indent += isLast ? "    " : "│   ";
-            for (var index = 0; index <= last; index++)
-            {
-                var child = children[index];
-                if (child.IsNode)
-                {
-                    RenderNode(child.AsNode(), indent, index == last);
-                } else if (child.IsToken)
-                {
-                    RenderToken(child.AsToken(), indent, index == last);
-                }
-            }
-        }
-
-        public static void RenderTree(SyntaxTree tree)
-        {
-            RenderNode(tree.Root, "", true);
-        }
-    }
-
     class Program
     {
         private static readonly string BaseDirectory;
@@ -156,9 +116,16 @@ namespace ConsoleDemo
             printer.Visit(tree.Root);
         }
 
+        public static void ReplDemo()
+        {
+            var repl = new MRepl();
+            repl.Run();
+        }
+
         public static void Main(string[] args)
         {
-            ParserDemo();
+            ReplDemo();
+            //ParserDemo();
             //SemanticsDemo();
             //ContextDemo();
             //DumbPrinterDemo();
diff --git a/Repl/MRepl.cs b/Repl/MRepl.cs
new file mode 100644
index 0000000..36a6fe4
--- /dev/null
+++ b/Repl/MRepl.cs
@@ -0,0 +1,60 @@
+using System;
+using Parser;
+
+namespace Repl
+{
+    public class MRepl
+    {
+        public void Run()
+        {
+            while (true)
+            {
+                Console.Write("> ");
+                var line = Console.ReadLine();
+                var window = new TextWindowWithNull(line);
+                var parser = new MParser(window);
+                var tree = parser.Parse();
+                TreeRenderer.RenderTree(tree);
+            }
+        }
+    }
+
+    public class TreeRenderer
+    {
+        private static void RenderToken(SyntaxToken token, string indent, bool isLast)
+        {
+            Console.Write(indent + (isLast ? "└── " : "├── "));
+            Console.Write($"<{token.Kind}>");
+            Console.Write($" {token.Text}");
+            Console.WriteLine();
+        }
+
+        private static void RenderNode(SyntaxNode node, string indent, bool isLast)
+        {
+            Console.Write(indent);
+            Console.Write(isLast ? "└── " : "├── ");
+            Console.Write($"<{node.Kind}>");
+            Console.WriteLine();
+            var children = node.GetChildNodesAndTokens();
+            var last = children.Count - 1;
+            indent += isLast ? "    " : "│   ";
+            for (var index = 0; index <= last; index++)
+            {
+                var child = children[index];
+                if (child.IsNode)
+                {
+                    RenderNode(child.AsNode(), indent, index == last);
+                }
+                else if (child.IsToken)
+                {
+                    RenderToken(child.AsToken(), indent, index == last);
+                }
+            }
+        }
+
+        public static void RenderTree(SyntaxTree tree)
+        {
+            RenderNode(tree.Root, "", true);
+        }
+    }
+}
diff --git a/Repl/Repl.csproj b/Repl/Repl.csproj
new file mode 100644
index 0000000..b6b87fa
--- /dev/null
+++ b/Repl/Repl.csproj
@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Parser\Parser.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/Solution.sln b/Solution.sln
index ff0098a..ed306a0 100644
--- a/Solution.sln
+++ b/Solution.sln
@@ -1,7 +1,7 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio 15
-VisualStudioVersion = 15.0.27130.2026
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.28315.86
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ConsoleDemo", "ConsoleDemo\ConsoleDemo.csproj", "{5025FD8F-0F1A-43E5-A996-7753BC703D62}"
 EndProject
@@ -19,6 +19,8 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution
 		README.md = README.md
 	EndProjectSection
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Repl", "Repl\Repl.csproj", "{8FEDFE5D-3320-418F-88A6-09C1B51C4441}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -45,6 +47,10 @@ Global
 		{4595633B-7F9A-4771-B348-F12BB9DD7ABC}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{4595633B-7F9A-4771-B348-F12BB9DD7ABC}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{4595633B-7F9A-4771-B348-F12BB9DD7ABC}.Release|Any CPU.Build.0 = Release|Any CPU
+		{8FEDFE5D-3320-418F-88A6-09C1B51C4441}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{8FEDFE5D-3320-418F-88A6-09C1B51C4441}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{8FEDFE5D-3320-418F-88A6-09C1B51C4441}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{8FEDFE5D-3320-418F-88A6-09C1B51C4441}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE