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0002_ANSI Character Driver #2.pas
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Pascal/Delphi Source File
|
1993-05-28
|
8KB
|
306 lines
UNIT Ansi;
INTERFACE
USES Crt, Dos;
CONST
RecANSI : BOOLEAN = FALSE;
PROCEDURE AnsiWrite (ch : CHAR);
PROCEDURE AnsiWriteLn (S : STRING);
IMPLEMENTATION
VAR
Escape, Saved_X,
Saved_Y : BYTE;
Control_Code : STRING;
FUNCTION GetNumber (VAR LINE : STRING) : INTEGER;
VAR
i, j, k : INTEGER;
temp0, temp1 : STRING;
BEGIN
temp0 := LINE;
VAL (temp0, i, j);
IF j = 0 THEN temp0 := ''
ELSE
BEGIN
temp1 := COPY (temp0, 1, j - 1);
DELETE (temp0, 1, j);
VAL (temp1, i, j);
END;
LINE := temp0;
GetNumber := i;
END;
PROCEDURE loseit;
BEGIN
escape := 0;
control_code := '';
RecANSI := FALSE;
END;
PROCEDURE Ansi_Cursor_move;
VAR
x, y : INTEGER;
BEGIN
y := GetNumber (control_code);
IF y = 0 THEN y := 1;
x := GetNumber (control_code);
IF x = 0 THEN x := 1;
IF y > 25 THEN y := 25;
IF x > 80 THEN x := 80;
GOTOXY (x, y);
loseit;
END;
PROCEDURE Ansi_Cursor_up;
VAR
y, new_y, offset : INTEGER;
BEGIN
Offset := getnumber (control_code);
IF Offset = 0 THEN offset := 1;
y := WHEREY;
IF (y - Offset) < 1 THEN
New_y := 1
ELSE
New_y := y - offset;
GOTOXY (WHEREX, new_y);
loseit;
END;
PROCEDURE Ansi_Cursor_Down;
VAR
y, new_y, offset : INTEGER;
BEGIN
Offset := getnumber (control_code);
IF Offset = 0 THEN offset := 1;
y := WHEREY;
IF (y + Offset) > 25 THEN
New_y := 25
ELSE
New_y := y + offset;
GOTOXY (WHEREX, new_y);
loseit;
END;
PROCEDURE Ansi_Cursor_Left;
VAR
x, new_x, offset : INTEGER;
BEGIN
Offset := getnumber (control_code);
IF Offset = 0 THEN offset := 1;
x := WHEREX;
IF (x - Offset) < 1 THEN
New_x := 1
ELSE
New_x := x - offset;
GOTOXY (new_x, WHEREY);
loseit;
END;
PROCEDURE Ansi_Cursor_Right;
VAR
x, new_x, offset : INTEGER;
BEGIN
Offset := getnumber (control_code);
IF Offset = 0 THEN offset := 1;
x := WHEREX;
IF (x + Offset) > 80 THEN
New_x := 1
ELSE
New_x := x + offset;
GOTOXY (New_x, WHEREY);
loseit;
END;
PROCEDURE Ansi_Clear_Screen;
BEGIN { 0J = cusor to Eos }
CLRSCR; { 1j start to cursor }
loseit; { 2j entie screen/cursor no-move}
END;
PROCEDURE Ansi_Clear_EoLine;
BEGIN
CLREOL;
loseit;
END;
PROCEDURE Reverse_Video;
VAR
tempAttr, tblink, tempAttrlo, tempAttrhi : BYTE;
BEGIN
LOWVIDEO;
TempAttrlo := (TextAttr AND $7);
tempAttrHi := (textAttr AND $70);
tblink := (textattr AND $80);
tempattrlo := tempattrlo * 16;
tempattrhi := tempattrhi DIV 16;
TextAttr := TempAttrhi + TempAttrLo + TBlink;
END;
PROCEDURE Ansi_Set_Colors;
VAR
temp0, Color_Code : INTEGER;
BEGIN
IF LENGTH (control_code) = 0 THEN control_code := '0';
WHILE (LENGTH (control_code) > 0) DO
BEGIN
Color_code := getNumber (control_code);
CASE Color_code OF
0 : BEGIN
LOWVIDEO;
TEXTCOLOR (LightGray);
TEXTBACKGROUND (Black);
END;
1 : HIGHVIDEO;
5 : TextAttr := (TextAttr OR $80);
7 : Reverse_Video;
30 : textAttr := (TextAttr AND $F8) + black;
31 : textattr := (TextAttr AND $f8) + red;
32 : textattr := (TextAttr AND $f8) + green;
33 : textattr := (TextAttr AND $f8) + brown;
34 : textattr := (TextAttr AND $f8) + blue;
35 : textattr := (TextAttr AND $f8) + magenta;
36 : textattr := (TextAttr AND $f8) + cyan;
37 : textattr := (TextAttr AND $f8) + Lightgray;
40 : TEXTBACKGROUND (black);
41 : TEXTBACKGROUND (red);
42 : TEXTBACKGROUND (green);
43 : TEXTBACKGROUND (yellow);
44 : TEXTBACKGROUND (blue);
45 : TEXTBACKGROUND (magenta);
46 : TEXTBACKGROUND (cyan);
47 : TEXTBACKGROUND (white);
END;
END;
loseit;
END;
PROCEDURE Ansi_Save_Cur_pos;
BEGIN
Saved_X := WHEREX;
Saved_Y := WHEREY;
loseit;
END;
PROCEDURE Ansi_Restore_cur_pos;
BEGIN
GOTOXY (Saved_X, Saved_Y);
loseit;
END;
PROCEDURE Ansi_check_code ( ch : CHAR);
BEGIN
CASE ch OF
'0'..'9', ';' : control_code := control_code + ch;
'H', 'f' : Ansi_Cursor_Move;
'A' : Ansi_Cursor_up;
'B' : Ansi_Cursor_Down;
'C' : Ansi_Cursor_Right;
'D' : Ansi_Cursor_Left;
'J' : Ansi_Clear_Screen;
'K' : Ansi_Clear_EoLine;
'm' : Ansi_Set_Colors;
's' : Ansi_Save_Cur_Pos;
'u' : Ansi_Restore_Cur_pos;
ELSE
loseit;
END;
END;
PROCEDURE AnsiWrite (ch : CHAR);
VAR
temp0 : INTEGER;
BEGIN
IF escape > 0 THEN
BEGIN
CASE Escape OF
1 : BEGIN
IF ch = '[' THEN
BEGIN
escape := 2;
Control_Code := '';
END
ELSE
escape := 0;
END;
2 : Ansi_Check_code (ch);
ELSE
BEGIN
escape := 0;
control_code := '';
RecANSI := FALSE;
END;
END;
END
ELSE
BEGIN
CASE Ch OF
#27 : Escape := 1;
#9 : BEGIN
temp0 := WHEREX;
temp0 := temp0 DIV 8;
temp0 := temp0 + 1;
temp0 := temp0 * 8;
GOTOXY (temp0, WHEREY);
END;
#12 : CLRSCR;
ELSE
BEGIN
IF ( (WHEREX = 80) AND (WHEREY = 25) ) THEN
BEGIN
windmax := (80 + (24 * 256) );
WRITE (ch);
windmax := (79 + (24 * 256) );
END
ELSE
WRITE (ch);
escape := 0;
END;
END;
END;
RecANSI := (Escape <> 0);
END;
PROCEDURE AnsiWriteLn (S : STRING);
VAR I : BYTE;
BEGIN
FOR I := 1 TO LENGTH (S) DO Ansiwrite (S [i]);
END;
END.