regex interpreter now can build partial correct AST (i forget groups), but in bad shape. building an optimizer.

StgSharp.RegularAnalysis/Abstraction/AbstractSyntaxTree.cs

@@ -43,6 +43,11 @@ namespace StgSharp.RegularAnalysis.Abstraction
 
         private TNode _root;
 
+        public HashSet<TNode> AllNodes
+        {
+            get { return _allToken; }
+        }
+
         public int Count
         {
             get { return _allToken.Count; }

StgSharp.RegularAnalysis/Abstraction/CompileStack.cs

@@ -59,7 +59,7 @@ namespace StgSharp.RegularAnalysis.Abstraction
         public int OperatorInDepthCount
         {
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
-            get => _operators.Count - _depthMarks.Peek().OperandPos;
+            get => _operators.Count - _depthMarks.Peek().OperatorPos;
         }
 
         public int Depth

StgSharp.RegularAnalysis/Abstraction/ISyntaxNode.cs

@@ -53,6 +53,8 @@ namespace StgSharp.RegularAnalysis.Abstraction
 
         TNode Right { get; set; }
 
+        TNode Parent { get; set; }
+
         static abstract TNode Empty { get; }
 
         Token<TLabel> Source { get; }