EditableBufferedReader.java
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package pad.prac1;
import java.io.*;
public class EditableBufferedReader extends BufferedReader
{
/*
* MODE DEFINITIONS
*/
public static final int DEL_BACKWARD = 0;
public static final int DEL_FORWARD = 1;
public static final int INSERT = 0;
public static final int OVERWRITE = 1;
/*
* TYPE DEFINITIONS
*/
public static final int ESCAPE_SEQUENCE = 0;
public static final int PRINTABLE = 1;
public static final int NON_PRINTABLE = 2;
/* KEY DEFINITIONS
*
* ESC (0x1B) starts an escape sequence
* ESC+[+C (0x1B 0x5B 0x43) Cursor Forward
* ESC+[+D (0x1B 0x5B 0x44) Cursor Backward
* ESC+[+2+~ (0x1B 0x5B 0x32 0x7E) Insert
* ESC+[+3+~ (0x1B 0x5B 0x33 0x7E) Delete forward
* ESC+O+H (0x1B 0x4F 0x48) Home
* ESC+O+F (0x1B 0x4F 0x46) End
*/
public static final int RETURN_KEY = 0x0D;
public static final int BACKSPACE = 0x08;
public static final int BACKSPACE_DEL = 0x7F;
public static final int ESC = 0x1B;
public static final int ESC_SEQ = 0x5B;
public static final int FORWARD = 0x43;
public static final int BACKWARD = 0x44;
public static final int DEL = 0x33;
public static final int TILDE = 0x7E;
public static final int HOME_END = 0x4F;
public static final int HOME = 0x48;
public static final int END = 0x46;
public static final int INSERT_KEY = 0x32;
public static final int INS_SPACE = 0x40;
public static final int DEL_CHAR = 0x50;
public static final int EOF = 0x04;
public static final int LINE_FEED = 0x0A;
private Console console = new Console();
private Line line = new Line(console);
private boolean endOfFile = false;
public EditableBufferedReader(Reader in)
{
super(in);
}
public EditableBufferedReader(Reader in, int sz)
{
super(in,sz);
}
private void setRaw() throws IOException, InterruptedException
{
String[] cmd = {"/bin/sh", "-c", "stty raw -echo </dev/tty"};
Runtime.getRuntime().exec(cmd).waitFor();
}
private void unsetRaw() throws IOException, InterruptedException
{
String[] cmd = {"/bin/sh", "-c", "stty -raw echo </dev/tty"};
Runtime.getRuntime().exec(cmd).waitFor();
}
private int parseKey(int key)
{
if(key < 0x20)
{
if(key == ESC)
{
return ESCAPE_SEQUENCE;
}
else if((key == BACKSPACE) || (key == RETURN_KEY) || (key == EOF))
{
return PRINTABLE;
}
return NON_PRINTABLE;
}
return PRINTABLE;
}
public int read() throws IOException
{
return super.read();
}
public String readLine()
{
try
{
setRaw();
}
catch (Exception e)
{
System.out.println("Couldn't set terminal in raw mode");
return "";
}
while(!endOfFile)
{
try
{
int character = read();
//System.err.print((String)(Integer.toHexString(character) + " ").toUpperCase());
switch(parseKey(character))
{
case ESCAPE_SEQUENCE:
switch(read())
{
case ESC_SEQ:
switch(read())
{
case FORWARD:
line.setCursorTo(line.getCursorPosition()+1);
break;
case BACKWARD:
line.setCursorTo(line.getCursorPosition()-1);
break;
case DEL:
if(read() == TILDE)
{
line.delChar(DEL_FORWARD);
}
break;
case INSERT_KEY:
if(read() == TILDE)
{
line.toggleMode();
}
break;
}
break;
case HOME_END:
switch(read())
{
case HOME:
line.setCursorTo(1);
break;
case END:
line.setCursorTo(line.length()+1);
break;
}
break;
}
break;
case PRINTABLE:
switch(character)
{
case EOF:
endOfFile = true;
break;
case BACKSPACE:
case BACKSPACE_DEL:
line.delChar(DEL_BACKWARD);
break;
case RETURN_KEY:
character = LINE_FEED;
default:
line.addChar((char)character);
break;
}
break;
case NON_PRINTABLE:
//ignore
break;
}
}
catch (IOException e)
{
System.out.println("Error reading line");
break;
}
}
try
{
unsetRaw();
}
catch (Exception e)
{
System.out.println("Couldn't unset raw mode");
return "";
}
System.out.println("");
return line.toString();
}
}
/* TO-DO
*
* up/down keys (needs text to work)
* pgup pgdown keys (goesto penultima linea visible)
* read terminal size
* update size dynamically
* long strings wrap down
* cursor keys skip final \n on a line
* careful if overwrite mode and final character is \n
*/