暂时实现了简陋的脚本AST分析解释，后面再绑定到控件上

Workbench/Themes/BindableRichTextBox.cs

@@ -0,0 +1,28 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Controls;
+using System.Windows.Documents;
+using System.Windows;
+
+namespace Serein.Workbench.Themes
+{
+    public partial class BindableRichTextBox : RichTextBox
+    {
+        public new FlowDocument Document
+        {
+            get { return (FlowDocument)GetValue(DocumentProperty); }
+            set { SetValue(DocumentProperty, value); }
+        }
+        // Using a DependencyProperty as the backing store for Document.  This enables animation, styling, binding, etc...
+        public static readonly DependencyProperty DocumentProperty =
+            DependencyProperty.Register("Document", typeof(FlowDocument), typeof(BindableRichTextBox), new FrameworkPropertyMetadata(null, new PropertyChangedCallback(OnDucumentChanged)));
+        private static void OnDucumentChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
+        {
+            RichTextBox rtb = (RichTextBox)d;
+            rtb.Document = (FlowDocument)e.NewValue;
+        }
+    }
+}