unit crt;

interface

type
	tcrtcoord = 1..255;

procedure AssignCrt(var F: Text);
procedure ClrEol;
procedure ClrScr;
procedure cursorbig;
procedure cursoroff;
procedure cursoron;
procedure Delay(MS: WORD);
procedure DelLine;
procedure GotoXY(X: tcrtcoord; Y: tcrtcoord);
procedure HighVideo;
procedure InsLine;
function KeyPressed: Boolean;
procedure LowVideo;
procedure NormVideo;
procedure NoSound;
function ReadKey: Char;
procedure Sound(Hz: Word);
procedure TextBackground(Color: Byte);
procedure TextColor(Color: Byte);
procedure TextMode(Mode: WORD);
function WhereX: tcrtcoord;
function WhereY: tcrtcoord;
procedure Window(X1: Byte; Y1: Byte; X2: Byte; Y2: Byte);

implementation

uses
	Sysutils,
	Strings,
	Windows;

const
	WIDTH = 80;
	HEIGHT = 26;
	SPACE = '                                                                                ';

var
	output: Handle;
	input: Handle;
	wx: Longint;
	wy: Longint;
	fore_color: WORD;
	back_color: WORD;
	last_key: Char;

procedure AssignCrt(var F: Text);
begin
end;

procedure ClrEol;
var
	info: TConsoleScreenBufferinfo;
	n: DWORD;
begin
	GetConsoleScreenBufferInfo(output, info);
	WriteConsoleOutputCharacter(output, SPACE, WIDTH - info.dwCursorPosition.X, info.dwCursorPosition, n);
	SetConsoleCursorPosition(output, info.dwCursorPosition);
end;

procedure ClrScr;
var
	info: TConsoleScreenBufferinfo;
	written: DWORD;
	xy: Coord;
begin
	xy.x := 0;
	xy.y := 0;

	GetConsoleScreenBufferInfo(output, info);
	FillConsoleOutputCharacter(output, Char(' '), info.dwSize.X * info.dwSize.Y, xy, written);
	FillConsoleOutputAttribute(output, info.wAttributes, info.dwSize.X * info.dwSize.Y, xy, written);
	GotoXY(1, 1);
end;

procedure cursorbig;
begin
end;

procedure cursoroff;
var
	info: CONSOLE_CURSOR_INFO;
begin
	GetConsoleCursorInfo(output, info);
	info.bVisible := false;
	SetConsoleCursorInfo(output, info);
end;

procedure cursoron;
var
	info: CONSOLE_CURSOR_INFO;
begin
	GetConsoleCursorInfo(output, info);
	info.bVisible := true;
	SetConsoleCursorInfo(output, info);
end;

procedure Delay(MS: Word);
begin
{
	Sleep(MS);
}
end;

procedure DelLine;
var
	info: TConsoleScreenBufferinfo;
	rect: SMALL_RECT;
	clip: SMALL_RECT;
	xy: Coord;
	c: CHAR_INFO;
begin
	GetConsoleScreenBufferInfo(output, info);
	rect.Left := 0;
	rect.Top := info.dwCursorPosition.Y + 1;
	rect.Right := WIDTH - 1;
	rect.Bottom := HEIGHT - 1;
	clip.Left := 0;
	clip.Top := 0;
	clip.Right := WIDTH - 1;
	clip.Bottom := HEIGHT - 1;
	xy.x := 0;
	xy.y := info.dwCursorPosition.Y;
	c.Attributes := 0;

	ScrollConsoleScreenBuffer(output, rect, clip, xy, c);
end;

procedure GotoXY(X: tcrtcoord; Y: tcrtcoord);
var
	xy: Coord;
begin
	xy.x := X + wx - 1;
	xy.y := Y + wy - 1;

	SetConsoleCursorPosition(output, xy);
end;

procedure HighVideo;
begin
end;

procedure InsLine;
var
	info: TConsoleScreenBufferinfo;
	rect: SMALL_RECT;
	clip: SMALL_RECT;
	xy: Coord;
	c: CHAR_INFO;
begin
	GetConsoleScreenBufferInfo(output, info);
	rect.Left := 0;
	rect.Top := info.dwCursorPosition.Y;
	rect.Right := WIDTH - 1;
	rect.Bottom := HEIGHT - 1;
	clip.Left := 0;
	clip.Top := 0;
	clip.Right := WIDTH - 1;
	clip.Bottom := HEIGHT - 1;
	xy.x := 0;
	xy.y := info.dwCursorPosition.Y + 1;
	c.Attributes := 0;

	ScrollConsoleScreenBuffer(output, rect, clip, xy, c);
end;

function KeyPressed: Boolean;
begin
	Sleep(1);

	last_key := #0;

	if((GetAsyncKeyState(VK_BACK) and $8000) <> 0) then last_key := #$08;
	if((GetAsyncKeyState(VK_TAB) and $8000) <> 0) then last_key := #$09;
	if((GetAsyncKeyState(VK_RETURN) and $8000) <> 0) then last_key := #$13;
	if((GetAsyncKeyState(VK_SPACE) and $8000) <> 0) then last_key := ' ';
	if((GetAsyncKeyState(VK_0) and $8000) <> 0) then last_key := '0';
	if((GetAsyncKeyState(VK_1) and $8000) <> 0) then last_key := '1';
	if((GetAsyncKeyState(VK_2) and $8000) <> 0) then last_key := '2';
	if((GetAsyncKeyState(VK_3) and $8000) <> 0) then last_key := '3';
	if((GetAsyncKeyState(VK_4) and $8000) <> 0) then last_key := '4';
	if((GetAsyncKeyState(VK_5) and $8000) <> 0) then last_key := '5';
	if((GetAsyncKeyState(VK_6) and $8000) <> 0) then last_key := '6';
	if((GetAsyncKeyState(VK_7) and $8000) <> 0) then last_key := '7';
	if((GetAsyncKeyState(VK_8) and $8000) <> 0) then last_key := '8';
	if((GetAsyncKeyState(VK_9) and $8000) <> 0) then last_key := '9';
	if((GetAsyncKeyState(VK_A) and $8000) <> 0) then last_key := 'A';
	if((GetAsyncKeyState(VK_B) and $8000) <> 0) then last_key := 'B';
	if((GetAsyncKeyState(VK_C) and $8000) <> 0) then last_key := 'C';
	if((GetAsyncKeyState(VK_D) and $8000) <> 0) then last_key := 'D';
	if((GetAsyncKeyState(VK_E) and $8000) <> 0) then last_key := 'E';
	if((GetAsyncKeyState(VK_F) and $8000) <> 0) then last_key := 'F';
	if((GetAsyncKeyState(VK_G) and $8000) <> 0) then last_key := 'G';
	if((GetAsyncKeyState(VK_H) and $8000) <> 0) then last_key := 'H';
	if((GetAsyncKeyState(VK_I) and $8000) <> 0) then last_key := 'I';
	if((GetAsyncKeyState(VK_J) and $8000) <> 0) then last_key := 'J';
	if((GetAsyncKeyState(VK_K) and $8000) <> 0) then last_key := 'K';
	if((GetAsyncKeyState(VK_L) and $8000) <> 0) then last_key := 'L';
	if((GetAsyncKeyState(VK_M) and $8000) <> 0) then last_key := 'M';
	if((GetAsyncKeyState(VK_N) and $8000) <> 0) then last_key := 'N';
	if((GetAsyncKeyState(VK_O) and $8000) <> 0) then last_key := 'O';
	if((GetAsyncKeyState(VK_P) and $8000) <> 0) then last_key := 'P';
	if((GetAsyncKeyState(VK_Q) and $8000) <> 0) then last_key := 'Q';
	if((GetAsyncKeyState(VK_R) and $8000) <> 0) then last_key := 'R';
	if((GetAsyncKeyState(VK_S) and $8000) <> 0) then last_key := 'S';
	if((GetAsyncKeyState(VK_T) and $8000) <> 0) then last_key := 'T';
	if((GetAsyncKeyState(VK_U) and $8000) <> 0) then last_key := 'U';
	if((GetAsyncKeyState(VK_V) and $8000) <> 0) then last_key := 'V';
	if((GetAsyncKeyState(VK_W) and $8000) <> 0) then last_key := 'W';
	if((GetAsyncKeyState(VK_X) and $8000) <> 0) then last_key := 'X';
	if((GetAsyncKeyState(VK_Y) and $8000) <> 0) then last_key := 'Y';
	if((GetAsyncKeyState(VK_Z) and $8000) <> 0) then last_key := 'Z';
	if((GetAsyncKeyState(VK_NUMPAD0) and $8000) <> 0) then last_key := '0';
	if((GetAsyncKeyState(VK_NUMPAD1) and $8000) <> 0) then last_key := '1';
	if((GetAsyncKeyState(VK_NUMPAD2) and $8000) <> 0) then last_key := '2';
	if((GetAsyncKeyState(VK_NUMPAD3) and $8000) <> 0) then last_key := '3';
	if((GetAsyncKeyState(VK_NUMPAD4) and $8000) <> 0) then last_key := '4';
	if((GetAsyncKeyState(VK_NUMPAD5) and $8000) <> 0) then last_key := '5';
	if((GetAsyncKeyState(VK_NUMPAD6) and $8000) <> 0) then last_key := '6';
	if((GetAsyncKeyState(VK_NUMPAD7) and $8000) <> 0) then last_key := '7';
	if((GetAsyncKeyState(VK_NUMPAD8) and $8000) <> 0) then last_key := '8';
	if((GetAsyncKeyState(VK_NUMPAD9) and $8000) <> 0) then last_key := '9';
	if((GetAsyncKeyState(VK_MULTIPLY) and $8000) <> 0) then last_key := '*';
	if((GetAsyncKeyState(VK_ADD) and $8000) <> 0) then last_key := '+';
	if((GetAsyncKeyState(VK_SUBTRACT) and $8000) <> 0) then last_key := '-';
	if((GetAsyncKeyState(VK_DECIMAL) and $8000) <> 0) then last_key := '/';
	if((GetAsyncKeyState(VK_DIVIDE) and $8000) <> 0) then last_key := '.';

	keyPressed := (last_key <> #0);
end;

procedure LowVideo;
begin
end;

procedure NormVideo;
begin
end;

procedure NoSound;
begin
end;

function ReadKey: Char;
var
	buf: Pchar;
	n: DWORD;
begin
	if (last_key <> #0) then
	begin
		ReadKey := last_key;
		last_key := #0;
		FlushConsoleInputBuffer(input);
		exit;
	end;

	SetConsoleMode(input, ENABLE_PROCESSED_INPUT);
	buf := stralloc(8);
	ReadConsole(input, buf, 1, n, nil);
	ReadKey := String(buf)[1];
	strdispose(buf);
	SetConsoleMode(input, ENABLE_PROCESSED_INPUT or ENABLE_LINE_INPUT or ENABLE_ECHO_INPUT);
end;

procedure Sound(Hz: Word);
begin
end;

procedure TextBackground(Color: Byte);
begin
	case Color of
		0: fore_color := 0;
		1: fore_color := BACKGROUND_BLUE;
		2: fore_color := BACKGROUND_GREEN;
		3: fore_color := BACKGROUND_BLUE or BACKGROUND_GREEN;
		4: fore_color := BACKGROUND_RED;
		5: fore_color := BACKGROUND_RED or BACKGROUND_BLUE;
		6: fore_color := BACKGROUND_RED or BACKGROUND_GREEN;
		7: fore_color := BACKGROUND_RED or BACKGROUND_BLUE or BACKGROUND_GREEN;
		8: fore_color := BACKGROUND_INTENSITY;
		9: fore_color := BACKGROUND_INTENSITY or BACKGROUND_BLUE;
		10: fore_color := BACKGROUND_INTENSITY or BACKGROUND_GREEN;
		11: fore_color := BACKGROUND_INTENSITY or BACKGROUND_BLUE or BACKGROUND_GREEN;
		12: fore_color := BACKGROUND_INTENSITY or BACKGROUND_RED;
		13: fore_color := BACKGROUND_INTENSITY or BACKGROUND_RED or BACKGROUND_BLUE;
		14: fore_color := BACKGROUND_INTENSITY or BACKGROUND_RED or BACKGROUND_GREEN;
		15: fore_color := BACKGROUND_INTENSITY or BACKGROUND_RED or BACKGROUND_BLUE or BACKGROUND_GREEN;
		else exit;
	end;

	SetConsoleTextAttribute(output, fore_color or back_color);
end;

procedure TextColor(Color: Byte);
begin
	case Color of
		0: back_color := 0;
		1: back_color := FOREGROUND_BLUE;
		2: back_color := FOREGROUND_GREEN;
		3: back_color := FOREGROUND_BLUE or FOREGROUND_GREEN;
		4: back_color := FOREGROUND_RED;
		5: back_color := FOREGROUND_RED or FOREGROUND_BLUE;
		6: back_color := FOREGROUND_RED or FOREGROUND_GREEN;
		7: back_color := FOREGROUND_RED or FOREGROUND_BLUE or FOREGROUND_GREEN;
		8: back_color := FOREGROUND_INTENSITY;
		9: back_color := FOREGROUND_INTENSITY or FOREGROUND_BLUE;
		10: back_color := FOREGROUND_INTENSITY or FOREGROUND_GREEN;
		11: back_color := FOREGROUND_INTENSITY or FOREGROUND_BLUE or FOREGROUND_GREEN;
		12: back_color := FOREGROUND_INTENSITY or FOREGROUND_RED;
		13: back_color := FOREGROUND_INTENSITY or FOREGROUND_RED or FOREGROUND_BLUE;
		14: back_color := FOREGROUND_INTENSITY or FOREGROUND_RED or FOREGROUND_GREEN;
		15: back_color := FOREGROUND_INTENSITY or FOREGROUND_RED or FOREGROUND_BLUE or FOREGROUND_GREEN;
		else exit;
	end;

	SetConsoleTextAttribute(output, fore_color or back_color);
end;

procedure TextMode(Mode: WORD);
begin
end;

function WhereX: tcrtcoord;
var
	info: TConsoleScreenBufferinfo;
begin
	GetConsoleScreenBufferInfo(output, info);
	WhereX := info.dwCursorPosition.X - wx + 1;
end;

function WhereY: tcrtcoord;
var
	info: TConsoleScreenBufferinfo;
begin
	GetConsoleScreenBufferInfo(output, info);
	WhereY := info.dwCursorPosition.Y - wy + 1;
end;

procedure Window(X1: Byte; Y1: Byte; X2: Byte; Y2: Byte);
begin
	wx := X1 - 1;
	wy := Y1 - 1;
	GotoXY(1, 1);
end;

procedure init;
var
	xy: Coord;
	r: SMALL_RECT;
begin
	output := GetStdHandle(STD_OUTPUT_HANDLE);
	input := GetStdHandle(STD_INPUT_HANDLE);
	SetConsoleMode(output, ENABLE_PROCESSED_OUTPUT or ENABLE_WRAP_AT_EOL_OUTPUT);
	SetConsoleMode(input, ENABLE_PROCESSED_INPUT or ENABLE_LINE_INPUT or ENABLE_ECHO_INPUT);

	xy.x := WIDTH;
	xy.y := HEIGHT;
	SetConsoleScreenBufferSize(output, xy);

	r.Top := 0;
	r.Left := 0;
	r.Right := WIDTH - 1;
	r.Bottom := HEIGHT - 1;
	SetConsoleWindowInfo(output, true, r);

	back_color := 0;
	fore_color := 0;
	TextBackground(0);
	TextColor(7);

	last_key := #0;
end;

initialization
	init;

finalization
	TextBackground(0);
	TextColor(7);
end.

{
	Copyright 2020 maruhiro
	All rights reserved. 

	Redistribution and use in source and binary forms, 
	with or without modification, are permitted provided that 
	the following conditions are met: 

	 1. Redistributions of source code must retain the above copyright notice, 
	    this list of conditions and the following disclaimer. 

	 2. Redistributions in binary form must reproduce the above copyright notice, 
	    this list of conditions and the following disclaimer in the documentation 
	    and/or other materials provided with the distribution. 

	THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, 
	INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 
	FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 
	THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
	SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
	PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 
	OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
	WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 
	OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 
	ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
}