Программная часть шаблона

mROA.CodegenTools/InsertTemplatePart.cs

@@ -3,7 +3,7 @@ using System.Collections.Generic;
 
 namespace mROA.CodegenTools
 {
-    public class InsertTemplatePart : ITemplatePart, ITagged
+    public class InsertTemplatePart : ITagged
     {
         private object _insertedValue;
         private string _tag;

mROA.CodegenTools/ProgrammableTextPart.cs

@@ -0,0 +1,24 @@
+using System;
+
+namespace mROA.CodegenTools
+{
+    public class ProgrammableTextPart : ITemplatePart
+    {
+        public TemplateDocument Context { get; set; }
+        public int TargetLength => 0;
+
+        private Func<object, string> _bakeFunc;
+
+        public ProgrammableTextPart(Func<object, string> bakeFunc, TemplateDocument context)
+        {
+            _bakeFunc = bakeFunc;
+            Context = context;
+        }
+
+
+        public string Bake()
+        {
+            return _bakeFunc(Context.AdditionalContext);
+        }
+    }
+}

mROA.CodegenTools/TemplateDocument.cs

@@ -7,6 +7,7 @@ namespace mROA.CodegenTools
     public class TemplateDocument
     {
         public List<ITemplatePart> Parts { get; }
+        public object AdditionalContext { get; set; }
         public ITagged this[string tag] => Parts.OfType<ITagged>().FirstOrDefault(i => i.Tag == tag);
         public void Insert(string tag, object value)
         {