Успешно переписаны не полностью два файла

mROA.Codegen/Tools/Reading/DefineSectionReader.cs

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+using System;
+
+namespace mROA.CodegenTools
+{
+    public class DefineSectionReader : LeadingTextSectionReader
+    {
+        public DefineSectionReader() : base("<!D")
+        {
+        }
+
+        public override ITemplateSection ExtractSection(ref int index, TemplateDocument document)
+        {
+            var tagEnd = TemplateText.IndexOf(">", index, StringComparison.Ordinal);
+            var sectionName = GetTagValue(index, tagEnd);
+            tagEnd += 1;
+            var endIndex = TemplateText.IndexOf("<!D>", tagEnd, StringComparison.Ordinal);
+            var storedText = TemplateText.Substring(tagEnd, endIndex - tagEnd);
+            index = endIndex + 4;
+            PassCaretToCloseSymbol();
+            PassCaretToCloseSymbol();
+            return new DefineTemplateSection(storedText, sectionName, document);
+        }
+    }
+}

mROA.Codegen/Tools/Reading/ISectionReader.cs

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+using System.Collections.Generic;
+
+namespace mROA.CodegenTools
+{
+    public interface ISectionReader
+    {
+        string TemplateText { get; set; }
+        int GetNextSectionIndex(int currentIndex);
+        ITemplateSection ExtractSection(ref int index, TemplateDocument document);
+    }
+}

mROA.Codegen/Tools/Reading/InnerTemplateSectionReader.cs

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+using System;
+
+namespace mROA.CodegenTools
+{
+    public class InnerTemplateSectionReader : LeadingTextSectionReader
+    {
+        public InnerTemplateSectionReader() 
+            : base("<!T")
+        {
+        }
+
+
+        public override ITemplateSection ExtractSection(ref int index, TemplateDocument document)
+        {
+            var end = FindEnd(index + 4);
+            var from = index;
+            index = PassCaretToCloseSymbol();
+            var to  = index - 1;
+
+            var tagName = GetTagValue(from, to);
+            
+            var innerDocText = TemplateText.Substring(index, end - index);
+            var innerDoc = TemplateReader.Parse(innerDocText);
+            _currentCaretPosition = end + 4;
+            index = _currentCaretPosition;
+            return new InnerTemplateSection(tagName, innerDoc, document);
+        }
+
+        private int FindEnd(int start)
+        {
+            var endSymbol = TemplateText.IndexOf("<!T>", start, StringComparison.Ordinal);
+            var innerStartSymbol = TemplateText.IndexOf("<!T ", start, StringComparison.Ordinal);
+            if (endSymbol < innerStartSymbol || innerStartSymbol == -1)
+                return endSymbol;
+
+            return FindEnd(endSymbol + 4);
+        }
+    }
+}

mROA.Codegen/Tools/Reading/InsertSectionReader.cs

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+using System.Linq;
+
+namespace mROA.CodegenTools
+{
+    public class InsertSectionReader : LeadingTextSectionReader
+    {
+        public InsertSectionReader() : base("<!I")
+        {
+        }
+
+
+        public override ITemplateSection ExtractSection(ref int index, TemplateDocument document)
+        {
+            var from = index;
+             index = PassCaretToCloseSymbol();
+            var to  = index - 1;
+
+            var tagText = GetTagValue(from, to);
+            var parts = tagText.Split(' ');
+            
+            return new InsertTemplatePart(parts[0], document, parts.Skip(1).ToArray());
+        }
+    }
+}

mROA.Codegen/Tools/Reading/LeadingTextSectionReader.cs

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+using System;
+
+namespace mROA.CodegenTools
+{
+    public abstract class LeadingTextSectionReader : ISectionReader
+    {
+        protected int _currentCaretPosition;
+        private string _tagLeading;
+
+        protected LeadingTextSectionReader(string tagLeading)
+        {
+            _tagLeading = tagLeading + " ";
+        }
+
+        protected int PassCaretToCloseSymbol()
+        {
+            _currentCaretPosition = TemplateText.IndexOf(">", _currentCaretPosition, StringComparison.Ordinal) + 1;
+            return _currentCaretPosition;
+        }
+
+        public string TemplateText { get; set; }
+
+        public int GetNextSectionIndex(int currentIndex)
+        {
+            _currentCaretPosition = Math.Max(currentIndex, _currentCaretPosition);
+            var index = TemplateText.IndexOf(_tagLeading, _currentCaretPosition, StringComparison.Ordinal);
+            _currentCaretPosition = index;
+            return index;
+        }
+
+        public abstract ITemplateSection ExtractSection(ref int index, TemplateDocument document);
+
+        protected string GetTagValue(int from, int to)
+        {
+            var realStart = from + 4;
+            var span = TemplateText.AsSpan();
+            var slice = span.Slice(realStart, to - realStart);
+            return new string(slice.ToArray());
+        }
+    }
+}

mROA.Codegen/Tools/Reading/LinkSectionReader.cs

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+namespace mROA.CodegenTools
+{
+    public class LinkSectionReader : LeadingTextSectionReader
+    {
+        public LinkSectionReader() : base("<!L")
+        {
+        }
+
+
+        public override ITemplateSection ExtractSection(ref int index, TemplateDocument document)
+        {
+            var from = index;
+            index = PassCaretToCloseSymbol();
+            var to =  index - 1;
+
+            var tagText = GetTagValue(from, to);
+            return new LinkTemplateSection(tagText, document);
+        }
+    }
+}

mROA.Codegen/Tools/Reading/TemplateReader.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Reflection;
+
+namespace mROA.CodegenTools
+{
+    public static class TemplateReader
+    {
+        private static readonly List<Type> ReaderTypes = new List<Type>
+        {
+            typeof(DefineSectionReader),
+            typeof(InsertSectionReader),
+            typeof(LinkSectionReader),
+            typeof(InnerTemplateSectionReader)
+        };
+
+        public static TemplateDocument Parse(string templateText)
+        {
+            
+            int currentIndex = 0;
+            var activeReaders = new List<ISectionReader>();
+
+            foreach (var readerType in ReaderTypes)
+            {
+                var reader = Activator.CreateInstance(readerType) as ISectionReader;
+                reader.TemplateText = templateText;
+                activeReaders.Add(reader);
+            }
+            
+            var doc = new TemplateDocument();
+
+            while (currentIndex < templateText.Length)
+            {
+                List<(ISectionReader reader, int index)> indices = activeReaders.Select(i => ((ISectionReader Readers, int index))(i, i.GetNextSectionIndex(currentIndex))).Where(i => i.index > -1).ToList();
+                int minIndex = templateText.Length;
+                ISectionReader minReader = null;
+                if (indices.Count != 0)
+                {
+                    minIndex = indices.Min(i => i.index);
+                    minReader = indices.FirstOrDefault(i => i.index == minIndex).reader;
+
+                    if (indices.Count != activeReaders.Count)
+                    {
+                        activeReaders = indices.Select(i => i.reader).ToList();
+                    }
+                }
+     
+                
+                if (currentIndex != minIndex)
+                {
+                    var literalText = templateText.Substring(currentIndex, minIndex - currentIndex);
+                    var literal =
+                        new LiteralTemplateSection(literalText, doc);
+                    doc.Parts.Add(literal);
+                    currentIndex = minIndex;
+                }
+
+                if (indices.Count != 0)
+                {
+                    var section = minReader.ExtractSection(ref currentIndex, doc);
+                    doc.Parts.Add(section);
+                }
+             
+
+            }
+
+            return doc;
+        }
+
+        public static TemplateDocument FromEmbeddedResource(string resourceName)
+        {
+            return FromEmbeddedResource(resourceName, Assembly.GetCallingAssembly());
+        }
+
+        public static TemplateDocument FromEmbeddedResource(string resourceName, Assembly assembly)
+        {
+            var fileName = assembly.GetManifestResourceNames().First(n => n.EndsWith(resourceName));
+            var res = assembly.GetManifestResourceStream(fileName);
+            var reader = new StreamReader(res);
+            var templateText = reader.ReadToEnd();
+            return Parse(templateText);
+        }
+    }
+}