EditableBufferedReader.java
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package pad.prac1;
import java.io.*;
public class EditableBufferedReader extends BufferedReader
{
/*
* MODE DEFINITIONS
*/
public static final int INSERT = 0;
public static final int OVERWRITE = 1;
public static final int DEL_BACKWARD = 0;
public static final int DEL_FORWARD = 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 = 0x7B;
public static final int ESC = 0x1B;
public static final int ESC_SEQ = 0x5B;
public static final int FORWARD_C = 0x43;
public static final int BACKWARD_D = 0x44;
public static final int DEL_3 = 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_2 = 0x32;
private String line = "";
private int lineLength = 0;
private int cursorPosition = 1;
private boolean returnKey = false;
private int writeMode = INSERT;
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)
{
//TO IMPLEMENT BOTH MODES
return PRINTABLE;
}
public void addChar(char character)
{
//switch writemode
//if insert
//print space
//moveto cursorPosition-1
//print char
//add to string
//update string length
//update cursor position
//if overwrite
//just print char
//add to string
//update string length
//update cursor position
}
public void delChar(int mode)
{
//switch mode
//if back
//del char using backspace
//remove char from line string
//update cursor position
//update line length
//if forward
//moveto cursorPosition+1
//del char using backspace
//remove char from line string
//update line length
}
private void moveCursorForward()
{
System.out.print((char)ESC);
System.out.print((char)ESC_SEQ);
System.out.print((char)FORWARD_C);
}
private void moveCursorBackward()
{
System.out.print((char)ESC);
System.out.print((char)ESC_SEQ);
System.out.print((char)BACKWARD_D);
}
public void moveCursorTo(int pos)
{
if((pos <= lineLength) && (pos >= 1))
{
if(pos > cursorPosition)
{
for(int i = 0; i < (pos - cursorPosition); i++)
{
moveCursorForward();
}
}
else if(pos < cursorPosition)
{
for(int i = 0; i < (cursorPosition - pos); i++)
{
moveCursorBackward();
}
}
cursorPosition = pos;
}
}
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(!returnKey)
{
try
{
int character = read();
System.out.println("\n\n" + character + "\n");
switch(parseKey(character))
{
case ESCAPE_SEQUENCE:
if(read() == ESC_SEQ)
{
switch(read())
{
case FORWARD_C:
moveCursorTo(cursorPosition+1);
break;
case BACKWARD_D:
moveCursorTo(cursorPosition-1);
break;
case DEL_3:
if(read() == TILDE)
{
delChar(DEL_FORWARD);
}
break;
case INSERT_2:
if(read() == TILDE)
{
writeMode = 1-writeMode;
}
break;
case HOME_END:
switch(read())
{
case HOME:
moveCursorTo(1);
break;
case END:
moveCursorTo(lineLength+1);
break;
}
break;
}
}
break;
case PRINTABLE:
switch(character)
{
case RETURN_KEY:
returnKey = true;
break;
case BACKSPACE:
case BACKSPACE_DEL:
delChar(DEL_BACKWARD);
break;
default:
addChar((char)character);
break;
}
break;
case NON_PRINTABLE:
//ignore
break;
}
}
catch (IOException e)
{
System.out.println("Couldn't unset raw mode");
break;
}
}
try
{
unsetRaw();
}
catch (Exception e)
{
System.out.println("Couldn't unset raw mode");
return "";
}
System.out.println("");
return line;
}
}