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readline/src/pad/prac1/Console.java 2.85 KB
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package pad.prac1;

import java.util.Observable;
import java.util.Observer;
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import java.util.Scanner;
import java.util.regex.Pattern;
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public class Console implements Observer 
{
Imanol-Mikel Barba Sabariego authored
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	private int numCols;
	private int numRows;
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	private int currentRow;

	public void updateCurrentPos()
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	{
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		Coordinate pos = getCurrentPos();
		currentRow = pos.y();
	}
Imanol-Mikel Barba Sabariego authored
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	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));
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        scanner.close();
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	}
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	public Coordinate getCurrentPos()
	{
		System.out.print((char)EditableBufferedReader.ESC);
		System.out.print((char)EditableBufferedReader.ESC_SEQ);
		System.out.print("6n");
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		Pattern pattern = Pattern.compile("(\\d+);(\\d+)");
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		Scanner scanner = new Scanner(System.in);
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        scanner.findWithinHorizon(pattern,0);
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        int x = Integer.parseInt(scanner.match().group(2));
        int y = Integer.parseInt(scanner.match().group(1));
        scanner.close();
		return new Coordinate(x,y);
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	}

	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);
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	}

	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)
	{
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		updateCurrentPos();
Imanol-Mikel Barba Sabariego authored
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		updateTermSize();
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		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:
Imanol-Mikel Barba Sabariego authored
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				currentRow += cmd.getValue()/numCols;
				if(currentRow > numRows)
				{
					currentRow = numRows;
				}
				Coordinate xy = new Coordinate(cmd.getValue()%numCols,currentRow);
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				moveCursorTo(xy);
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			break;
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			case Command.NEWLINE:
				System.out.print((char)EditableBufferedReader.LINE_FEED);
				System.out.print((char)EditableBufferedReader.RETURN_KEY);
				currentRow++;				
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		}
	}
}