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+/*
+    This file is part of Konsole, an X terminal.
+    
+    Copyright 2007-2008 by Robert Knight <robertknight@gmail.com>
+    Copyright 1997,1998 by Lars Doelle <lars.doelle@on-line.de>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+    02110-1301  USA.
+*/
+
+#ifndef VT102EMULATION_H
+#define VT102EMULATION_H
+
+// Standard Library
+#include <stdio.h>
+
+// Qt 
+#include <QtGui/QKeyEvent>
+#include <QtCore/QHash>
+#include <QtCore/QTimer>
+
+// Konsole
+#include "Emulation.h"
+#include "Screen.h"
+
+#define MODE_AppScreen       (MODES_SCREEN+0)   // Mode #1
+#define MODE_AppCuKeys       (MODES_SCREEN+1)   // Application cursor keys (DECCKM)
+#define MODE_AppKeyPad       (MODES_SCREEN+2)   // 
+#define MODE_Mouse1000       (MODES_SCREEN+3)   // Send mouse X,Y position on press and release
+#define MODE_Mouse1001       (MODES_SCREEN+4)   // Use Hilight mouse tracking
+#define MODE_Mouse1002       (MODES_SCREEN+5)   // Use cell motion mouse tracking
+#define MODE_Mouse1003       (MODES_SCREEN+6)   // Use all motion mouse tracking 
+#define MODE_Ansi            (MODES_SCREEN+7)   // Use US Ascii for character sets G0-G3 (DECANM) 
+#define MODE_132Columns      (MODES_SCREEN+8)   // 80 <-> 132 column mode switch (DECCOLM)
+#define MODE_Allow132Columns (MODES_SCREEN+9)   // Allow DECCOLM mode
+#define MODE_total           (MODES_SCREEN+10)
+
+struct CharCodes
+{
+  // coding info
+  char charset[4]; //
+  int  cu_cs;      // actual charset.
+  bool graphic;    // Some VT100 tricks
+  bool pound  ;    // Some VT100 tricks
+  bool sa_graphic; // saved graphic
+  bool sa_pound;   // saved pound
+};
+
+/**
+ * Provides an xterm compatible terminal emulation based on the DEC VT102 terminal.
+ * A full description of this terminal can be found at http://vt100.net/docs/vt102-ug/
+ * 
+ * In addition, various additional xterm escape sequences are supported to provide 
+ * features such as mouse input handling.
+ * See http://rtfm.etla.org/xterm/ctlseq.html for a description of xterm's escape
+ * sequences. 
+ *
+ */
+class Vt102Emulation : public Emulation
+{ 
+Q_OBJECT
+
+public:
+  /** Constructs a new emulation */
+  Vt102Emulation();
+  ~Vt102Emulation();
+  
+  // reimplemented from Emulation
+  virtual void clearEntireScreen();
+  virtual void reset();
+  virtual char eraseChar() const;
+  
+public slots: 
+  // reimplemented from Emulation 
+  virtual void sendString(const char*,int length = -1);
+  virtual void sendText(const QString& text);
+  virtual void sendKeyEvent(QKeyEvent*);
+  virtual void sendMouseEvent(int buttons, int column, int line, int eventType);
+  
+protected:
+  // reimplemented from Emulation
+  virtual void setMode(int mode);
+  virtual void resetMode(int mode);
+  virtual void receiveChar(int cc);
+  
+private slots:
+  //causes changeTitle() to be emitted for each (int,QString) pair in pendingTitleUpdates
+  //used to buffer multiple title updates
+  void updateTitle();
+
+private:
+  unsigned short applyCharset(unsigned short c);
+  void setCharset(int n, int cs);
+  void useCharset(int n);
+  void setAndUseCharset(int n, int cs);
+  void saveCursor();
+  void restoreCursor();
+  void resetCharset(int scrno);
+
+  void setMargins(int top, int bottom);
+  //set margins for all screens back to their defaults
+  void setDefaultMargins();
+
+  // returns true if 'mode' is set or false otherwise
+  bool getMode    (int mode);
+  // saves the current boolean value of 'mode'
+  void saveMode   (int mode);
+  // restores the boolean value of 'mode' 
+  void restoreMode(int mode);
+  // resets all modes
+  // (except MODE_Allow132Columns)
+  void resetModes();
+
+  void resetTokenizer();
+  #define MAX_TOKEN_LENGTH 80
+  void addToCurrentToken(int cc);
+  int tokenBuffer[MAX_TOKEN_LENGTH]; //FIXME: overflow?
+  int tokenBufferPos;
+#define MAXARGS 15
+  void addDigit(int dig);
+  void addArgument();
+  int argv[MAXARGS];
+  int argc;
+  void initTokenizer();
+
+  // Set of flags for each of the ASCII characters which indicates
+  // what category they fall into (printable character, control, digit etc.)
+  // for the purposes of decoding terminal output
+  int charClass[256];
+
+  void reportDecodingError(); 
+
+  void processToken(int code, int p, int q);
+  void processWindowAttributeChange();
+
+  void reportTerminalType();
+  void reportSecondaryAttributes();
+  void reportStatus();
+  void reportAnswerBack();
+  void reportCursorPosition();
+  void reportTerminalParms(int p);
+
+  void onScrollLock();
+  void scrollLock(const bool lock);
+
+  // clears the screen and resizes it to the specified
+  // number of columns
+  void clearScreenAndSetColumns(int columnCount);
+
+  CharCodes _charset[2];
+
+  class TerminalState
+  {
+  public:
+    // Initializes all modes to false
+    TerminalState()
+    { memset(&mode,false,MODE_total * sizeof(bool)); }
+
+    bool mode[MODE_total];
+  };
+
+  TerminalState _currentModes;
+  TerminalState _savedModes;
+
+  //hash table and timer for buffering calls to the session instance 
+  //to update the name of the session
+  //or window title.
+  //these calls occur when certain escape sequences are seen in the 
+  //output from the terminal
+  QHash<int,QString> _pendingTitleUpdates;
+  QTimer* _titleUpdateTimer;
+};
+
+#endif // VT102EMULATION_H