Imanol-Mikel Barba Sabariego / PAD · Files

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()
	{

		// If we could just handle SIGWINCH, this would not be necessary and it would run A LOT faster

		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++;				

		}
	}
}