Console.java
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package pad.prac1;
import java.util.Observable;
import java.util.Observer;
import java.util.Scanner;
import java.util.regex.Pattern;
public class Console implements Observer
{
private int numCols;
private int numRows;
private int currentRow;
public void updateCurrentPos()
{
Coordinate pos = getCurrentPos();
currentRow = pos.y();
}
public void updateTermSize()
{
System.out.print((char)EditableBufferedReader.ESC);
System.out.print((char)EditableBufferedReader.ESC_SEQ);
System.out.print("18t");
Pattern pattern = Pattern.compile("8;(\\d+);(\\d+)");
Scanner scanner = new Scanner(System.in);
scanner.findWithinHorizon(pattern,0);
numCols = Integer.parseInt(scanner.match().group(2));
numRows = Integer.parseInt(scanner.match().group(1));
System.err.println("TERMSIZE:" + numCols + " " + numRows);
}
public Coordinate getCurrentPos()
{
System.out.print((char)EditableBufferedReader.ESC);
System.out.print((char)EditableBufferedReader.ESC_SEQ);
System.out.print("6n");
Pattern pattern = Pattern.compile("(\\d+);(\\d+)");
Scanner scanner = new Scanner(System.in);
scanner.findWithinHorizon(pattern,0);
int x = Integer.parseInt(scanner.match().group(2));
int y = Integer.parseInt(scanner.match().group(1));
System.err.println("POS:" + x + " " + y);
return new Coordinate(x,y);
}
public void moveCursorTo(Coordinate xy)
{
System.out.print((char)EditableBufferedReader.ESC);
System.out.print((char)EditableBufferedReader.ESC_SEQ);
System.out.print(xy.y());
System.out.print(';');
System.out.print(xy.x());
System.out.print((char)EditableBufferedReader.GOTO);
}
private void insertSpace()
{
System.out.print((char)EditableBufferedReader.ESC);
System.out.print((char)EditableBufferedReader.ESC_SEQ);
System.out.print((char)EditableBufferedReader.INS_SPACE);
}
private void delChar()
{
System.out.print((char)EditableBufferedReader.ESC);
System.out.print((char)EditableBufferedReader.ESC_SEQ);
System.out.print((char)EditableBufferedReader.DEL_CHAR);
}
public void addChar(char c, Line line)
{
if(line.getCursorPosition() != line.length()+1)
{
insertSpace();
}
System.out.print(c);
}
public void update(Observable obs, Object arg)
{
updateCurrentPos();
updateTermSize();
Line line = (Line)obs;
Command cmd = (Command)arg;
switch(cmd.getType())
{
case Command.INSERT_CHAR:
addChar((char)cmd.getValue(),line);
break;
case Command.DELETE_CHAR:
delChar();
break;
case Command.MOVE_CURSOR:
currentRow += cmd.getValue()/numCols;
if(currentRow > numRows)
{
currentRow = numRows;
}
Coordinate xy = new Coordinate(cmd.getValue()%numCols,currentRow);
moveCursorTo(xy);
break;
case Command.NEWLINE:
System.out.print((char)EditableBufferedReader.LINE_FEED);
System.out.print((char)EditableBufferedReader.RETURN_KEY);
currentRow++;
}
}
}