--- a/Implab/Formats/TextScanner.cs	Fri Mar 18 18:10:30 2016 +0300
+++ b/Implab/Formats/TextScanner.cs	Mon Mar 21 18:41:45 2016 +0300
@@ -1,52 +1,45 @@
 using System;
 using Implab.Components;
+using Implab.Automaton.RegularExpressions;
+using System.Diagnostics;
+using Implab.Automaton;
 
 namespace Implab.Formats {
     public abstract class TextScanner<TTag> : Disposable {
 
-        readonly int[] m_buffer;
+        int m_maxSymbol;
+        int[] m_symbolMap;
+
+        readonly char[] m_buffer;
         int m_bufferOffset;
-        int m_dataLength;
+        int m_bufferSize;
         int m_tokenLength;
 
         TTag[] m_tags;
 
-        BufferScanner<TTag> m_scanner;
-
-        protected bool ReadTokenInternal() {
-            if (EOF)
-                return false;
-            
-            // create a new scanner from template (scanners are value types)
-            var inst = m_scanner;
-
-            m_tokenLength = 0;
+        protected bool ReadTokenInternal(DFAStateDescriptor<TTag>[] dfa, int state) {
+            Debug.Assert(dfa != null);
 
-            while (inst.Scan(m_buffer, m_bufferOffset, m_dataLength)) {
-                m_tokenLength += m_dataLength;
+            do {
+                for (var pos = m_bufferOffset; pos < m_bufferSize; pos++) {
+                    var ch = m_buffer[pos];
+                    state = dfa[state].transitions[m_symbolMap[ch > m_maxSymbol ? m_maxSymbol : ch]];
+                    if (state == DFAConst.UNREACHABLE_STATE)
+                        break;
+                }
+            } while (Feed());
 
-                var actual = Read(m_buffer, 0, m_buffer.Length);
-                    
-                m_bufferOffset = 0;
-                m_dataLength = actual;
+            if (dfa[state].final) {
 
-                if (actual == 0) {
-                    inst.Eof();
-                    break;
-                }
             }
 
-            var len = inst.Position - m_bufferOffset;
-            m_tokenLength += len;
-            m_dataLength -= len;
-            m_bufferOffset = inst.Position;
-
-            // save result;
-        
-            m_tags = inst.GetTokenTags();
         }
 
-        protected abstract int Read(int[] buffer, int offset, int size);
+        bool Feed() {
+
+        }
+
+        protected abstract int Read(char[] buffer, int offset, int size);
 
         protected TTag[] Tags {
             get {
@@ -54,8 +47,7 @@
             }
         }
 
-        public abstract bool EOF { get; }
- 
+         
     }
 }