#include "termina_vt52.h"

#define RETURN 015

#define LINEFEED 012

#define BACKSPACE 010

#define TAB 011

#define SPACE 040

#define DELETE 0177

#define ESC 033

#define XOFF 023

#define XON 021

namespace Terminal {

VT52::VT52() : BasicTerminal(80,24), _state(State::Normal) {}

// ESC K is sent on a ESC Z

const char* VT52::putChar(char c) {

c & 0x7F;

switch(_state) {

case State::Normal:

if(c != ESC) return BasicTerminal::putChar(c);

_state = State::InEscape;// escape code

break;

case State::InEscape:

switch(c) {

case 'A': if(_cursor.y() > 0) _cursor.moveUp(); break; // Cursor up

case 'B': if(_cursor.y() <= (_height-1)) _cursor.moveDown(); break; // Cursor up

case 'C': if(_cursor.x() <= (_width-1)) _cursor.moveRight(); break; // Cursor up

case 'D': if(_cursor.x() > 0 ) _cursor.moveLeft(); break; // Cursor up

case 'F': _graphicsMode = true; break; // enter graphics mode, not supported yet

case 'G': _graphicsMode = false; break;// exit graphics mode

case 'H': _cursor = Cursor(); break; // set home

case 'L': reverseLineFeed(); break; // reverse line feed, not sure if this is right?

case 'J': clearScreen(_cursor.y(),_cursor.x()); break;

case 'K': clearLine(_cursor.y(),_cursor.x()); break;

case 'Y':

_state = State::NeedY;

return nullptr;

case 'Z': // Ident

_state = State::Normal; // have to change the state here since we return here

return "\033K"; // return for VT52 without copier or printer

case 0133: _holdScreen = true; break;// hold screen mode on, not supported right yet

case 0134: _holdScreen = false; break;// hold screen mode off, not supported right yet

case 075: _altKeypad = true; break; // alternate keypad mode on '='

case 076: _altKeypad = false; break;// alternate keypad mode off '>'

}

_state = State::Normal;

break;

case State::NeedY:

_posBuffer = c;

_state = State::NeedX;

break;

case State::NeedX:

setCursor(Cursor(c - 040,_posBuffer-040));

_state = State::Normal;

break;

}

return nullptr;

}

}