IMPLEMENTATION MODULE VT100;

IMPORT ASCII;
FROM STextIO IMPORT WriteString, WriteChar;
FROM NumberIO IMPORT WriteCard;
IMPORT IO, termios, FIO;

VAR
  savedTerm : termios.TERMIOS;
  flushFlag : INTEGER;
  haveTerm : BOOLEAN;

(* helper: ESC [ *)
PROCEDURE CSI;
BEGIN
  WriteChar(ASCII.esc);
  WriteChar("[");
END CSI;

PROCEDURE CSIPriv; (* ESC [ ? *)
BEGIN
  WriteChar(ASCII.esc);
  WriteString("[?");
END CSIPriv;

(* SGR *)
PROCEDURE ResetAttributes;
BEGIN CSI; WriteString("0m"); END ResetAttributes;

PROCEDURE Bold;
BEGIN CSI; WriteString("1m"); END Bold;

PROCEDURE Underline;
BEGIN CSI; WriteString("4m"); END Underline;

PROCEDURE Blink;
BEGIN CSI; WriteString("5m"); END Blink;

PROCEDURE Reverse;
BEGIN CSI; WriteString("7m"); END Reverse;

(* Cursor *)
PROCEDURE CursorHome;
BEGIN CSI; WriteChar("H"); END CursorHome;

PROCEDURE CursorPosition(line, col : CARDINAL);
BEGIN
  CSI; WriteCard(line, 1); WriteChar(";"); WriteCard(col, 1); WriteChar("H");
END CursorPosition;

PROCEDURE HVPosition(line, col : CARDINAL);
BEGIN
  CSI; WriteCard(line, 1); WriteChar(";"); WriteCard(col, 1); WriteChar("f");
END HVPosition;

PROCEDURE CursorUp(n : CARDINAL);
BEGIN CSI; WriteCard(n, 1); WriteChar("A"); END CursorUp;

PROCEDURE CursorDown(n : CARDINAL);
BEGIN CSI; WriteCard(n, 1); WriteChar("B"); END CursorDown;

PROCEDURE CursorRight(n : CARDINAL);
BEGIN CSI; WriteCard(n, 1); WriteChar("C"); END CursorRight;

PROCEDURE CursorLeft(n : CARDINAL);
BEGIN CSI; WriteCard(n, 1); WriteChar("D"); END CursorLeft;

PROCEDURE Index;
BEGIN WriteChar(ASCII.esc); WriteChar("D"); END Index;

PROCEDURE ReverseIndex;
BEGIN WriteChar(ASCII.esc); WriteChar("M"); END ReverseIndex;

PROCEDURE NextLine;
BEGIN WriteChar(ASCII.esc); WriteChar("E"); END NextLine;

PROCEDURE SaveCursor;
BEGIN WriteChar(ASCII.esc); WriteChar("7"); END SaveCursor;

PROCEDURE RestoreCursor;
BEGIN WriteChar(ASCII.esc); WriteChar("8"); END RestoreCursor;

(* Erase *)
PROCEDURE ClearLineRight;
BEGIN CSI; WriteChar("K"); END ClearLineRight;

PROCEDURE ClearLineLeft;
BEGIN CSI; WriteString("1K"); END ClearLineLeft;

PROCEDURE ClearLine;
BEGIN CSI; WriteString("2K"); END ClearLine;

PROCEDURE ClearScreenDown;
BEGIN CSI; WriteChar("J"); END ClearScreenDown;

PROCEDURE ClearScreenUp;
BEGIN CSI; WriteString("1J"); END ClearScreenUp;

PROCEDURE ClearScreen;
BEGIN CSI; WriteString("2J"); END ClearScreen;

PROCEDURE SetScrollRegion(top, bottom : CARDINAL);
BEGIN
  CSI; WriteCard(top, 1); WriteChar(";"); WriteCard(bottom, 1); WriteChar("r");
END SetScrollRegion;

(* Tabs *)
PROCEDURE TabSet;
BEGIN WriteChar(ASCII.esc); WriteChar("H"); END TabSet;

PROCEDURE TabClear;
BEGIN CSI; WriteChar("g"); END TabClear;

PROCEDURE TabClearAll;
BEGIN CSI; WriteString("3g"); END TabClearAll;

(* Double-size / alignment *)
PROCEDURE DoubleHeightTop;
BEGIN WriteChar(ASCII.esc); WriteString("#3"); END DoubleHeightTop;

PROCEDURE DoubleHeightBottom;
BEGIN WriteChar(ASCII.esc); WriteString("#4"); END DoubleHeightBottom;

PROCEDURE SingleWidth;
BEGIN WriteChar(ASCII.esc); WriteString("#5"); END SingleWidth;

PROCEDURE DoubleWidth;
BEGIN WriteChar(ASCII.esc); WriteString("#6"); END DoubleWidth;

PROCEDURE ScreenAlign;
BEGIN WriteChar(ASCII.esc); WriteString("#8"); END ScreenAlign;

(* Modes *)
PROCEDURE SetNewLine; BEGIN CSI; WriteString("20h"); END SetNewLine;
PROCEDURE ResetNewLine; BEGIN CSI; WriteString("20l"); END ResetNewLine;

PROCEDURE SetAppCursorKeys; BEGIN CSIPriv; WriteString("1h"); END SetAppCursorKeys;
PROCEDURE SetCursorKeys; BEGIN CSIPriv; WriteString("1l"); END SetCursorKeys;
PROCEDURE SetANSI; BEGIN CSIPriv; WriteString("2h"); END SetANSI;
PROCEDURE SetVT52; BEGIN CSIPriv; WriteString("2l"); END SetVT52;
PROCEDURE Set132Columns; BEGIN CSIPriv; WriteString("3h"); END Set132Columns;
PROCEDURE Set80Columns; BEGIN CSIPriv; WriteString("3l"); END Set80Columns;
PROCEDURE SetSmoothScroll; BEGIN CSIPriv; WriteString("4h"); END SetSmoothScroll;
PROCEDURE SetJumpScroll; BEGIN CSIPriv; WriteString("4l"); END SetJumpScroll;
PROCEDURE SetReverseScreen; BEGIN CSIPriv; WriteString("5h"); END SetReverseScreen;
PROCEDURE SetNormalScreen; BEGIN CSIPriv; WriteString("5l"); END SetNormalScreen;
PROCEDURE SetRelativeOrigin; BEGIN CSIPriv; WriteString("6h"); END SetRelativeOrigin;
PROCEDURE SetAbsoluteOrigin; BEGIN CSIPriv; WriteString("6l"); END SetAbsoluteOrigin;
PROCEDURE SetAutoWrap; BEGIN CSIPriv; WriteString("7h"); END SetAutoWrap;
PROCEDURE ResetAutoWrap; BEGIN CSIPriv; WriteString("7l"); END ResetAutoWrap;
PROCEDURE SetAutoRepeat; BEGIN CSIPriv; WriteString("8h"); END SetAutoRepeat;
PROCEDURE ResetAutoRepeat; BEGIN CSIPriv; WriteString("8l"); END ResetAutoRepeat;
PROCEDURE SetInterlace; BEGIN CSIPriv; WriteString("9h"); END SetInterlace;
PROCEDURE ResetInterlace; BEGIN CSIPriv; WriteString("9l"); END ResetInterlace;

(* Keypad *)
PROCEDURE SetAltKeypad;
BEGIN WriteChar(ASCII.esc); WriteChar("="); END SetAltKeypad;

PROCEDURE SetNumKeypad;
BEGIN WriteChar(ASCII.esc); WriteChar(">"); END SetNumKeypad;

(* Charsets *)
PROCEDURE SetUK_G0; BEGIN WriteChar(ASCII.esc); WriteString("(A"); END SetUK_G0;
PROCEDURE SetUS_G0; BEGIN WriteChar(ASCII.esc); WriteString("(B"); END SetUS_G0;
PROCEDURE SetGraphics_G0; BEGIN WriteChar(ASCII.esc); WriteString("(0"); END SetGraphics_G0;
PROCEDURE SetAlt_G0; BEGIN WriteChar(ASCII.esc); WriteString("(1"); END SetAlt_G0;
PROCEDURE SetAltGraph_G0; BEGIN WriteChar(ASCII.esc); WriteString("(2"); END SetAltGraph_G0;
PROCEDURE SetUK_G1; BEGIN WriteChar(ASCII.esc); WriteString(")A"); END SetUK_G1;
PROCEDURE SetUS_G1; BEGIN WriteChar(ASCII.esc); WriteString(")B"); END SetUS_G1;
PROCEDURE SetGraphics_G1; BEGIN WriteChar(ASCII.esc); WriteString(")0"); END SetGraphics_G1;
PROCEDURE SetAlt_G1; BEGIN WriteChar(ASCII.esc); WriteString(")1"); END SetAlt_G1;
PROCEDURE SetAltGraph_G1; BEGIN WriteChar(ASCII.esc); WriteString(")2"); END SetAltGraph_G1;
PROCEDURE Shift2; BEGIN WriteChar(ASCII.esc); WriteChar("N"); END Shift2;
PROCEDURE Shift3; BEGIN WriteChar(ASCII.esc); WriteChar("O"); END Shift3;

(* Reports / reset *)
PROCEDURE RequestDeviceStatus;
BEGIN CSI; WriteString("5n"); END RequestDeviceStatus;

PROCEDURE RequestCursorPosition;
BEGIN CSI; WriteString("6n"); END RequestCursorPosition;

PROCEDURE Identify;
BEGIN CSI; WriteChar("c"); END Identify;

PROCEDURE Identify2;
BEGIN CSI; WriteString("0c"); END Identify2;

PROCEDURE ResetTerminal;
BEGIN WriteChar(ASCII.esc); WriteChar("c"); END ResetTerminal;

(* LEDs / tests *)
PROCEDURE LedsOff; BEGIN CSI; WriteString("0q"); END LedsOff;
PROCEDURE Led1; BEGIN CSI; WriteString("1q"); END Led1;
PROCEDURE Led2; BEGIN CSI; WriteString("2q"); END Led2;
PROCEDURE Led3; BEGIN CSI; WriteString("3q"); END Led3;
PROCEDURE Led4; BEGIN CSI; WriteString("4q"); END Led4;

PROCEDURE TestPowerUp; BEGIN CSI; WriteString("2;1y"); END TestPowerUp;
PROCEDURE TestLoopback; BEGIN CSI; WriteString("2;2y"); END TestLoopback;
PROCEDURE TestPowerRepeat; BEGIN CSI; WriteString("2;9y"); END TestPowerRepeat;
PROCEDURE TestLoopRepeat; BEGIN CSI; WriteString("2;10y"); END TestLoopRepeat;

(* Terminal input mode (cf. Editor/Tests/T17.mod): Unbuffered
   saves the termios state and disables line buffering so device
   replies can be read char by char; Buffered restores it. *)
PROCEDURE Unbuffered;
BEGIN
  flushFlag := termios.tcsflush();
  savedTerm := termios.InitTermios();
  haveTerm := termios.tcgetattr(FIO.StdIn, savedTerm) # -1;
  IO.UnBufferedMode(0, TRUE);
  IO.UnBufferedMode(1, TRUE);
END Unbuffered;

PROCEDURE Buffered;
VAR res : INTEGER;
BEGIN
  IO.BufferedMode(0, TRUE);
  IO.BufferedMode(1, TRUE);
  IF haveTerm THEN
    haveTerm := FALSE;
    res := termios.tcsetattr(FIO.StdIn, flushFlag, savedTerm);
  END;
END Buffered;

END VT100.