Basic Syntax highlighting, added CodeTextBox to MainWindow to test it.

Befunge/Editor/CharStyles/BefungeStyler.cs

@@ -0,0 +1,38 @@
+using System.Collections.Generic;
+using System.Linq;
+using System.Windows;
+using System.Windows.Documents;
+using System.Windows.Media;
+
+namespace Befunge.Editor.CharStyles
+{
+    public class BefungeStyler : ITextStyler
+    {
+        private string _directionals = "<>^v?r";
+
+        public IEnumerable<Run> StyledString(string input)
+        {
+            var runs = new List<Run>();
+
+            foreach (var c in input)
+            {
+                if (_directionals.Contains(c))
+                    runs.Add(new Run(c.ToString())
+                    {
+                        Foreground = new SolidColorBrush(Colors.CornflowerBlue),
+                        FontWeight = FontWeights.Bold
+                    });
+                else
+                {
+                    runs.Add(new Run(c.ToString())
+                    {
+                        Foreground = new SolidColorBrush(Colors.Black),
+                        FontWeight = FontWeights.Normal
+                    });
+                }
+            }
+
+            return runs;
+        }
+    }
+}

Befunge/Editor/CharStyles/ITextStyler.cs

@@ -1,14 +1,13 @@
 using System;
 using System.Collections.Generic;
-using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 using System.Windows.Documents;
 
 namespace Befunge.Editor.CharStyles
 {
-    public interface ICharStyler
+    public interface ITextStyler
     {
-        Run StyledString(string input);
+        IEnumerable<Run> StyledString(string input);
     }
-}
+}