TwoTerm/VT05.mm

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//
// VT05.m
// 2Term
//
// Created by Kelvin Sherlock on 7/6/2010.
// Copyright 2010 __MyCompanyName__. All rights reserved.
//
#include <sys/ttydefaults.h>
#include <cctype>
#import "VT05.h"
#include "OutputChannel.h"
#include "Screen.h"
@implementation VT05
enum {
StateText,
StateDCAY,
StateDCAX
};
enum {
VTBell = 07,
VTCursorLeft = 010,
VTTab = 011,
VTLineFeed = 012,
VTCursorDown = 013,
VTCarriageReturn = 015,
VTCAD = 016,
VTCursorRight = 030,
VTCursorUp = 032,
VTHome = 035,
VTEOL = 036,
VTEOS = 037
};
+(void)load
{
[EmulatorManager registerClass: self];
}
+(NSString *)name
{
return @"VT05";
}
-(NSString *)name
{
return @"VT05";
}
-(const char *)termName
{
return "vt05";
}
-(void)reset
{
_state = StateText;
}
-(void)keyDown: (NSEvent *)event screen: (Screen *)screen output: (OutputChannel *)output
{
unsigned flags = [event modifierFlags];
NSString *chars = [event charactersIgnoringModifiers];
unsigned length = [chars length];
for (unsigned i = 0; i < length; ++i)
{
unichar uc = [chars characterAtIndex: i];
uint8_t c;
switch (uc)
{
case NSLeftArrowFunctionKey:
output->write(VTCursorLeft);
break;
case NSRightArrowFunctionKey:
output->write(VTCursorRight);
break;
case NSUpArrowFunctionKey:
output->write(VTCursorUp);
break;
case NSDownArrowFunctionKey:
output->write(VTCursorDown);
break;
case NSHomeFunctionKey:
output->write(VTHome);
break;
case NSDeleteCharacter:
output->write(0x7f);
break;
default:
if (uc > 0x7f) break;
c = uc;
if (flags & NSControlKeyMask)
{
c = CTRL(c);
}
output->write(c);
break;
}
}
}
-(void)processCharacter: (uint8_t)c screen: (Screen *)screen output: (OutputChannel *)output
{
switch (_state)
{
case StateText:
{
switch (c)
{
case 0x00:
case 0x7f:
// padding.
break;
case VTBell:
/*
* Produces an audible tone.
*/
NSBeep();
break;
case VTCursorLeft:
// backspace aka left arrow.
screen->decrementX();
break;
case VTTab:
[self tab: screen];
break;
case VTLineFeed:
// line feed.
screen->lineFeed();
break;
case VTCursorDown:
// arrow down.
screen->incrementY();
break;
case VTCarriageReturn:
// carriage return;
screen->setX(0);
break;
case VTCAD:
// CAD
_state = StateDCAY;
break;
case VTCursorRight:
// right arrow.
screen->incrementX();
break;
case VTCursorUp:
// up arrow
screen->decrementY();
break;
case VTHome:
// home
screen->setCursor(0, 0);
break;
case VTEOL:
// erase line
screen->eraseLine();
break;
case VTEOS:
// erase screen,
screen->eraseScreen();
break;
default:
if (c >= ' ' && c < 0x7f)
{
// if cursor at end of screen, overwrite previous contents, doesn't advance cursor.
if (_upperCase) c = toupper(c);
screen->putc(c);
}
break;
}
break;
}
case StateDCAY:
{
// not sure how invalid values are handled.
if (c != 0x00)
{
_state = StateDCAX;
_dca.y = c - ' ';
}
break;
}
case StateDCAX:
{
if (c != 0x00)
{
_state = StateText;
_dca.x = c - ' ';
screen->setCursor(_dca);
}
break;
}
}
}
-(void)tab: (Screen *)screen
{
/*
* TAB (011_8) causes the cursor to move right to the next TAB stop each time the TAB code is received.
* TAB stops are preset eight character spaces apart. TAB stop locations are at characters positions 1, 9,
* 17, 25, 33, 41, 49, 57, and 65. Once the cursor reaches character position 65, all TAB commands
* received thereafter will cause the cursor to move only one character position. Once the cursor reaches
* character position 72, receipt of the the TAB code has no effect.
*/
int x = screen->x();
if (x >= screen->width() - 8)
{
screen->setX(x + 1);
}
else
{
screen->setX((x + 8) & ~7);
}
}
-(BOOL)resizable
{
return NO;
}
-(struct winsize)defaultSize
{
struct winsize ws = { 20, 72, 0, 0 };
return ws;
}
@end