TwoTerm/Emulators/VT50.mm.ragel

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//
// VT50.m
// TwoTerm
//
// Created by Kelvin Sherlock on 3/2/2018.
//
#include <sys/ttydefaults.h>
#include <cctype>
#include <cstdio>
#include <numeric>
#include <algorithm>
#import "VT50.h"
#include "OutputChannel.h"
#include "Screen.h"
#define ESC "\x1b"
enum {
ModelVT50,
ModelVT50H,
ModelVT52,
ModelVT55
};
namespace {
void normalize(iRect &r){
r.origin.y <<= 1;
r.size.height <<= 1;
}
void normalize(iPoint &p) {
p.y <<= 1;
}
}
%%{
machine vt50;
alphtype unsigned int;
esc = 0x1b;
action vt50h { _model == ModelVT50H }
action vt50 { _model == ModelVT50 }
action tab {
if (cursor.x < 72) cursor.x = (cursor.x + 8) & ~7;
else if (cursor.x < window.maxX() -1) cursor.x++;
}
action linefeed {
if (cursor.y < window.maxY() - 1) cursor.y++;
else {
screen->scrollUp();
screen->scrollUp();
}
}
action rlinefeed {
// this is documented as being vt52++
// however the 2BSD termcap entry (dating to 1980)
// and every termcap since claims 50h supports it...
if (cursor.y) cursor.y--;
else {
screen->scrollDown();
screen->scrollDown();
}
}
action erase_eos {
iRect tmp;
tmp.origin = cursor;
tmp.size = iSize( window.maxX() - cursor.x, 1);
normalize(tmp);
screen->eraseRect(tmp);
tmp.origin = iPoint(0, cursor.y+1);
tmp.size = iSize(window.maxX(), window.maxY() - cursor.y - 1);
normalize(tmp);
screen->eraseRect(tmp);
}
action erase_eol {
iRect tmp;
tmp.origin = cursor;
tmp.size = iSize( window.maxX() - cursor.x, 1);
normalize(tmp);
screen->eraseRect(tmp);
}
action identify {
// NB -- these indicate no copier.
switch(_model) {
case ModelVT50:
output->write(ESC "/A");
break;
case ModelVT50H:
output->write(ESC "/H");
break;
}
}
action dca {
unsigned y = _scratch[0];
if (y >= window.maxY()) y = window.maxY() -1;
cursor.y = y;
unsigned x = _scratch[1];
if (x >= window.maxX()) x = window.maxX() -1;
cursor.x = x;
}
action forward {
if (cursor.x > window.maxX()-1) {
cursor.x = window.minX();
if (cursor.y >= window.maxY()-1) {
screen->scrollUp();
screen->scrollUp();
} else {
cursor.y++;
}
}
}
arg1 = any ${ _scratch[0] = ((fc & 0x7f) - 32); };
arg2 = any ${ _scratch[1] = ((fc & 0x7f) - 32); };
control_codes = (
0x07 ${ NSBeep(); }
| 0x08 ${ if (cursor.x) cursor.x--; }
| 0x09 $tab
| 0x0a $linefeed
| 0x0d ${ cursor.x = 0; }
2018-11-24 18:26:47 +00:00
| 0x0e when vt50h arg1 arg2 $dca
| cntrl - esc
);
2018-11-24 18:26:47 +00:00
escape_codes = control_codes* <: (
esc
| 'A' ${ if (cursor.y) cursor.y--; }
| 'B' when vt50h ${ if (cursor.y < window.maxY() -1) cursor.y++; }
| 'C' ${ if (cursor.x < window.maxX() -1) cursor.x++; }
| 'D' when vt50h ${ if (cursor.x) cursor.x--; }
#| 'F' when vt52_or_better ${ _graphics = true; }
#| 'G' when vt52_or_better ${ _graphics = false; }
| 'H' ${ cursor = iPoint(0, 0); }
| 'I' when vt50h $rlinefeed
| 'J' $erase_eos
| 'K' $erase_eol
| 'Y' when vt50h arg1 arg2 $dca
| 'Z' $identify
#| '=' when vt52_or_better ${ _altKeyPad = true; }
#| '>' when vt52_or_better ${ _altKeyPad = false; }
| any
);
main := (
control_codes
| esc escape_codes
| 0x20 .. 0x7e $forward ${
uint8_t c = fc;
if (c & 0x40) c &= ~0x20;
screen->putc(c, iPoint(cursor.x, cursor.y << 1), 0);
cursor.x++;
}
| any
)** $err { fgoto main; };
write data;
}%%
@implementation VT50x
-(BOOL)resizable
{
return NO;
}
-(struct winsize)defaultSize
{
struct winsize ws = { 0, 0, 0, 0};
// VT50x have 12 rows. They are double spaced.
ws.ws_row = 12;
ws.ws_col = 80;
return ws;
}
-(struct winsize)displaySize
{
struct winsize ws = { 0, 0, 0, 0};
// VT50x have 12 rows. They are double spaced.
ws.ws_row = 24;
ws.ws_col = 80;
return ws;
}
+(NSString *)name {
return @"";
}
-(NSString *)name {
return @"";
}
-(const char *)termName {
return "";
}
-(void)reset: (BOOL)hard
{
%% write init;
_altKeyPad = false;
_graphics = false;
if (hard) {
_context.cursor = iPoint(0,0);
_context.window = iRect(0, 0, 80, 12);
}
_context.flags = 0;
}
-(void)keyDown: (NSEvent *)event screen: (Screen *)screen output: (OutputChannel *)output
{
NSEventModifierFlags flags = [event modifierFlags];
NSString *chars = [event charactersIgnoringModifiers];
NSUInteger length = [chars length];
for (unsigned i = 0; i < length; ++i)
{
unichar uc = [chars characterAtIndex: i];
uint8_t c;
if (flags & NSNumericPadKeyMask)
{
if (_altKeyPad)
{
const char *str = NULL;
switch (uc)
{
case '0':
str = ESC "?p";
break;
case '1':
str = ESC "?q";
break;
case '2':
str = ESC "?r";
break;
case '3':
str = ESC "?s";
break;
case '4':
str = ESC "?t";
break;
case '5':
str = ESC "?u";
break;
case '6':
str = ESC "?v";
break;
case '7':
str = ESC "?w";
break;
case '8':
str = ESC "?x";
break;
case '9':
str = ESC "?y";
break;
case '.':
str = ESC "?n";
break;
case NSNewlineCharacter: //?
case NSEnterCharacter:
str = ESC "?M";
break;
}
if (str)
{
output->write(str);
break;
}
}
}
switch (uc)
{
case NSEnterCharacter:
output->write('\r');
break;
case NSDeleteCharacter:
output->write(0x7f);
break;
case NSUpArrowFunctionKey:
output->write(ESC "A");
break;
case NSDownArrowFunctionKey:
output->write(ESC "B");
break;
case NSRightArrowFunctionKey:
output->write(ESC "C");
break;
case NSLeftArrowFunctionKey:
output->write(ESC "D");
break;
// 3 function keys. (VT50H / VT52)
case NSF1FunctionKey:
output->write(ESC "P");
break;
case NSF2FunctionKey:
output->write(ESC "Q");
break;
case NSF3FunctionKey:
output->write(ESC "R");
break;
default:
if (uc > 0x7f) break;
c = uc;
if (flags & (NSShiftKeyMask | NSAlphaShiftKeyMask))
{
c = toupper(c);
}
if (flags & NSControlKeyMask)
{
c = CTRL(c);
}
output->write(c);
break;
}
}
}
-(void)processData: (uint8_t *)data length: (size_t)length screen:(Screen *)screen output:(OutputChannel *)output
{
std::transform(data, data + length, data, [](uint8_t c){ return c & 0x7f; });
const uint8_t *eof = nullptr;
const uint8_t *p = data;
const uint8_t *pe = std::copy_if(data, data + length, data, [](uint8_t c){
if (c == 0 || c == 0x7f) return false;
return true;
});
iPoint &cursor = _context.cursor;
const iRect &window = _context.window;
%%write exec;
auto cc = cursor;
cc.y <<= 1;
if (cc.x == 80) cc.x = 79;
screen->setCursor(cc);
}
@end
@implementation VT50
+(void)load {
[EmulatorManager registerClass: self];
}
+(NSString *)name {
return @"VT50";
}
-(NSString *)name {
return @"VT50";
}
-(const char *)termName {
return "vt50";
}
-(id)init {
if ((self = [super init])) {
_model = ModelVT50;
[self reset: YES];
}
return self;
}
@end
@implementation VT50H
+(void)load {
[EmulatorManager registerClass: self];
}
+(NSString *)name {
return @"VT50H";
}
-(NSString *)name {
return @"VT50H";
}
-(const char *)termName {
return "vt50h";
}
-(id)init {
if ((self = [super init])) {
_model = ModelVT50H;
[self reset: YES];
}
return self;
}
@end