vt320.java

The Javatm Telnet Application/Applet 很好用的

   * A small conveniance method thar converts the string to a byte array
   * for sending.
   * @param s the string to be sent
   */
  private boolean write(String s, boolean doecho) {
    if (debug > 2) System.out.println("write(|" + s + "|," + doecho);
    if (s == null) // aka the empty string.
      return true;
    /* NOTE: getBytes() honours some locale, it *CONVERTS* the string.
     * However, we output only 7bit stuff towards the target, and *some*
     * 8 bit control codes. We must not mess up the latter, so we do hand
     * by hand copy.
     */

    byte arr[] = new byte[s.length()];
    for (int i = 0; i < s.length(); i++) {
      arr[i] = (byte) s.charAt(i);
    }
    write(arr);

    if (doecho)
      putString(s);
    return true;
  }

  private boolean write(String s) {
    return write(s, localecho);
  }

  // ===================================================================
  // the actual terminal emulation code comes here:
  // ===================================================================

  private String terminalID = "vt320";
  private String answerBack = "Use Terminal.answerback to set ...\n";

  // X - COLUMNS, Y - ROWS
  int R,C;
  int attributes = 0;

  int Sc,Sr,Sa,Stm,Sbm;
  char Sgr,Sgl;
  char Sgx[];

  int insertmode = 0;
  int statusmode = 0;
  boolean vt52mode = false;
  boolean keypadmode = false; /* false - numeric, true - application */
  boolean output8bit = false;
  int normalcursor = 0;
  boolean moveoutsidemargins = true;
  boolean wraparound = true;
  boolean sendcrlf = true;
  boolean capslock = false;
  boolean numlock = false;
  int mouserpt = 0;
  byte mousebut = 0;

  boolean useibmcharset = false;

  int lastwaslf = 0;
  boolean usedcharsets = false;

  private final static char ESC = 27;
  private final static char IND = 132;
  private final static char NEL = 133;
  private final static char RI = 141;
  private final static char SS2 = 142;
  private final static char SS3 = 143;
  private final static char DCS = 144;
  private final static char HTS = 136;
  private final static char CSI = 155;
  private final static char OSC = 157;
  private final static int TSTATE_DATA = 0;
  private final static int TSTATE_ESC = 1; /* ESC */
  private final static int TSTATE_CSI = 2; /* ESC [ */
  private final static int TSTATE_DCS = 3; /* ESC P */
  private final static int TSTATE_DCEQ = 4; /* ESC [? */
  private final static int TSTATE_ESCSQUARE = 5; /* ESC # */
  private final static int TSTATE_OSC = 6;       /* ESC ] */
  private final static int TSTATE_SETG0 = 7;     /* ESC (? */
  private final static int TSTATE_SETG1 = 8;     /* ESC )? */
  private final static int TSTATE_SETG2 = 9;     /* ESC *? */
  private final static int TSTATE_SETG3 = 10;    /* ESC +? */
  private final static int TSTATE_CSI_DOLLAR = 11; /* ESC [ Pn $ */
  private final static int TSTATE_CSI_EX = 12; /* ESC [ ! */
  private final static int TSTATE_ESCSPACE = 13; /* ESC <space> */
  private final static int TSTATE_VT52X = 14;
  private final static int TSTATE_VT52Y = 15;
  private final static int TSTATE_CSI_TICKS = 16;
  private final static int TSTATE_CSI_EQUAL = 17; /* ESC [ = */

  /* The graphics charsets
   * B - default ASCII
   * A - ISO Latin 1
   * 0 - DEC SPECIAL
   * < - User defined
   * ....
   */
  char gx[] = {// same initial set as in XTERM.
    'B', // g0
    '0', // g1
    'B', // g2
    'B', // g3
  };
  char gl = 0;		// default GL to G0
  char gr = 2;		// default GR to G2
  int onegl = -1;	// single shift override for GL.

  // Map from scoansi linedrawing to DEC _and_ unicode (for the stuff which
  // is not in linedrawing). Got from experimenting with scoadmin.
  private final static String scoansi_acs = "Tm7k3x4u?kZl@mYjEnB\u2566DqCtAvM\u2550:\u2551N\u2557I\u2554;\u2557H\u255a0a<\u255d";
  // array to store DEC Special -> Unicode mapping
  //  Unicode   DEC  Unicode name    (DEC name)
  private static char DECSPECIAL[] = {
    '\u0040', //5f blank
    '\u2666', //60 black diamond
    '\u2592', //61 grey square
    '\u2409', //62 Horizontal tab  (ht) pict. for control
    '\u240c', //63 Form Feed       (ff) pict. for control
    '\u240d', //64 Carriage Return (cr) pict. for control
    '\u240a', //65 Line Feed       (lf) pict. for control
    '\u00ba', //66 Masculine ordinal indicator
    '\u00b1', //67 Plus or minus sign
    '\u2424', //68 New Line        (nl) pict. for control
    '\u240b', //69 Vertical Tab    (vt) pict. for control
    '\u2518', //6a Forms light up   and left
    '\u2510', //6b Forms light down and left
    '\u250c', //6c Forms light down and right
    '\u2514', //6d Forms light up   and right
    '\u253c', //6e Forms light vertical and horizontal
    '\u2594', //6f Upper 1/8 block                        (Scan 1)
    '\u2580', //70 Upper 1/2 block                        (Scan 3)
    '\u2500', //71 Forms light horizontal or ?em dash?    (Scan 5)
    '\u25ac', //72 \u25ac black rect. or \u2582 lower 1/4 (Scan 7)
    '\u005f', //73 \u005f underscore  or \u2581 lower 1/8 (Scan 9)
    '\u251c', //74 Forms light vertical and right
    '\u2524', //75 Forms light vertical and left
    '\u2534', //76 Forms light up   and horizontal
    '\u252c', //77 Forms light down and horizontal
    '\u2502', //78 vertical bar
    '\u2264', //79 less than or equal
    '\u2265', //7a greater than or equal
    '\u00b6', //7b paragraph
    '\u2260', //7c not equal
    '\u00a3', //7d Pound Sign (british)
    '\u00b7'  //7e Middle Dot
  };

  /** Strings to send on function key pressing */
  private String Numpad[];
  private String FunctionKey[];
  private String FunctionKeyShift[];
  private String FunctionKeyCtrl[];
  private String FunctionKeyAlt[];
  private String TabKey[];
  private String KeyUp[],KeyDown[],KeyLeft[],KeyRight[];
  private String KPMinus, KPComma, KPPeriod, KPEnter;
  private String PF1, PF2, PF3, PF4;
  private String Help, Do, Find, Select;

  private String KeyHome[], KeyEnd[], Insert[], Remove[], PrevScn[], NextScn[];
  private String Escape[], BackSpace[], NUMDot[], NUMPlus[];

  private String osc,dcs;  /* to memorize OSC & DCS control sequence */

  /** vt320 state variable (internal) */
  private int term_state = TSTATE_DATA;
  /** in vms mode, set by Terminal.VMS property */
  private boolean vms = false;
  /** Tabulators */
  private byte[] Tabs;
  /** The list of integers as used by CSI */
  private int[] DCEvars = new int[30];
  private int DCEvar;

  /**
   * Replace escape code characters (backslash + identifier) with their
   * respective codes.
   * @param tmp the string to be parsed
   * @return a unescaped string
   */
  static String unEscape(String tmp) {
    int idx = 0, oldidx = 0;
    String cmd;
    // System.err.println("unescape("+tmp+")");
    cmd = "";
    while ((idx = tmp.indexOf('\\', oldidx)) >= 0 &&
            ++idx <= tmp.length()) {
      cmd += tmp.substring(oldidx, idx - 1);
      if (idx == tmp.length()) return cmd;
      switch (tmp.charAt(idx)) {
        case 'b':
          cmd += "\b";
          break;
        case 'e':
          cmd += "\u001b";
          break;
        case 'n':
          cmd += "\n";
          break;
        case 'r':
          cmd += "\r";
          break;
        case 't':
          cmd += "\t";
          break;
        case 'v':
          cmd += "\u000b";
          break;
        case 'a':
          cmd += "\u0012";
          break;
        default :
          if ((tmp.charAt(idx) >= '0') && (tmp.charAt(idx) <= '9')) {
            int i;
            for (i = idx; i < tmp.length(); i++)
              if ((tmp.charAt(i) < '0') || (tmp.charAt(i) > '9'))
                break;
            cmd += (char) Integer.parseInt(tmp.substring(idx, i));
            idx = i - 1;
          } else
            cmd += tmp.substring(idx, ++idx);
          break;
      }
      oldidx = ++idx;
    }
    if (oldidx <= tmp.length()) cmd += tmp.substring(oldidx);
    return cmd;
  }

  /**
   * A small conveniance method thar converts a 7bit string to the 8bit
   * version depending on VT52/Output8Bit mode.
   *
   * @param s the string to be sent
   */
  private boolean writeSpecial(String s) {
    if (s == null)
      return true;
    if (((s.length() >= 3) && (s.charAt(0) == 27) && (s.charAt(1) == 'O'))) {
      if (vt52mode) {
        if ((s.charAt(2) >= 'P') && (s.charAt(2) <= 'S')) {
          s = "\u001b" + s.substring(2); /* ESC x */
        } else {
          s = "\u001b?" + s.substring(2); /* ESC ? x */
        }
      } else {
        if (output8bit) {
          s = "\u008f" + s.substring(2);  /* SS3 x */
        } /* else keep string as it is */
      }
    }
    if (((s.length() >= 3) && (s.charAt(0) == 27) && (s.charAt(1) == '['))) {
      if (output8bit) {
        s = "\u009b" + s.substring(2); /* CSI ... */
      } /* else keep */
    }
    return write(s, false);
  }

  /**
   * main keytyping event handler...
   */
  public void keyPressed(int keyCode, char keyChar, int modifiers) {
    boolean control = (modifiers & VDUInput.KEY_CONTROL) != 0;
    boolean shift = (modifiers & VDUInput.KEY_SHIFT) != 0;
    boolean alt = (modifiers & VDUInput.KEY_ALT) != 0;

    if (debug > 1) System.out.println("keyPressed("+keyCode+", "+(int)keyChar+", "+modifiers+")");

    int xind;
    String fmap[];
    xind = 0;
    fmap = FunctionKey;
    if (shift) {
      fmap = FunctionKeyShift;
      xind = 1;
    }
    if (control) {
      fmap = FunctionKeyCtrl;
      xind = 2;
    }
    if (alt) {
      fmap = FunctionKeyAlt;
      xind = 3;
    }

    switch (keyCode) {
      case KeyEvent.VK_PAUSE:
        if (shift || control)
          sendTelnetCommand((byte) 243); // BREAK
        break;
      case KeyEvent.VK_F1:
        writeSpecial(fmap[1]);
        break;
      case KeyEvent.VK_F2:
        writeSpecial(fmap[2]);
        break;
      case KeyEvent.VK_F3:
        writeSpecial(fmap[3]);
        break;
      case KeyEvent.VK_F4:
        writeSpecial(fmap[4]);
        break;
      case KeyEvent.VK_F5:
        writeSpecial(fmap[5]);
        break;
      case KeyEvent.VK_F6:
        writeSpecial(fmap[6]);
        break;
      case KeyEvent.VK_F7:
        writeSpecial(fmap[7]);
        break;
      case KeyEvent.VK_F8:
        writeSpecial(fmap[8]);
        break;
      case KeyEvent.VK_F9:
        writeSpecial(fmap[9]);
        break;
      case KeyEvent.VK_F10:
        writeSpecial(fmap[10]);
        break;
      case KeyEvent.VK_F11:
        writeSpecial(fmap[11]);
        break;
      case KeyEvent.VK_F12:
        writeSpecial(fmap[12]);
        break;
      case KeyEvent.VK_UP:
        writeSpecial(KeyUp[xind]);
        break;
      case KeyEvent.VK_DOWN:
        writeSpecial(KeyDown[xind]);
        break;
      case KeyEvent.VK_LEFT:
        writeSpecial(KeyLeft[xind]);
        break;
      case KeyEvent.VK_RIGHT:
        writeSpecial(KeyRight[xind]);
        break;
      case KeyEvent.VK_PAGE_DOWN:
        writeSpecial(NextScn[xind]);
        break;
      case KeyEvent.VK_PAGE_UP:
        writeSpecial(PrevScn[xind]);
        break;
      case KeyEvent.VK_INSERT:
        writeSpecial(Insert[xind]);
        break;
      case KeyEvent.VK_DELETE:
        writeSpecial(Remove[xind]);
        break;
      case KeyEvent.VK_BACK_SPACE:
        writeSpecial(BackSpace[xind]);
	if (localecho) {
	  if (BackSpace[xind] == "\b") {
	    putString("\b \b"); // make the last char 'deleted'
	  } else {
	    putString(BackSpace[xind]); // echo it
	  }
	}
        break;
      case KeyEvent.VK_HOME:
        writeSpecial(KeyHome[xind]);
        break;
      case KeyEvent.VK_END:
        writeSpecial(KeyEnd[xind]);
        break;
      case KeyEvent.VK_NUM_LOCK:
        if (vms && control) {
          writeSpecial(PF1);
        }
        if (!control)
          numlock = !numlock;
        break;
      case KeyEvent.VK_CAPS_LOCK:
        capslock = !capslock;
        return;
      case KeyEvent.VK_SHIFT:
      case KeyEvent.VK_CONTROL:
      case KeyEvent.VK_ALT:
        return;
      default:
        break;
    }
  }

  public void keyReleased(KeyEvent evt) {
    if (debug > 1) System.out.println("keyReleased("+evt+")");
    // ignore
  }

  /**
   * Handle key Typed events for the terminal, this will get
   * all normal key types, but no shift/alt/control/numlock.
   */
  public void keyTyped(int keyCode, char keyChar, int modifiers) {
    boolean control = (modifiers & VDUInput.KEY_CONTROL) != 0;
    boolean shift = (modifiers & VDUInput.KEY_SHIFT) != 0;
    boolean alt = (modifiers & VDUInput.KEY_ALT) != 0;

    if (debug > 1) System.out.println("keyTyped("+keyCode+", "+(int)keyChar+", "+modifiers+")");

    if (keyChar == '\t') {
      if (shift) {