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package pad.prac1;
import java.io.*;
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import java.util.Scanner;
import java.util.regex.Pattern;
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public class EditableBufferedReader extends BufferedReader
{
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/*
* MODE DEFINITIONS
*/
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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;
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/*
* TYPE DEFINITIONS
*/
public static final int ESCAPE_SEQUENCE = 0;
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public static final int PRINTABLE = 1;
public static final int NON_PRINTABLE = 2;
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/* KEY DEFINITIONS
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*
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* 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;
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public static final int BACKSPACE_DEL = 0x7F;
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public static final int ESC = 0x1B;
public static final int ESC_SEQ = 0x5B;
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public static final int FORWARD = 0x43;
public static final int BACKWARD = 0x44;
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public static final int GOTO = 0x48;
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public static final int DEL = 0x33;
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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;
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public static final int INSERT_KEY = 0x32;
public static final int INS_SPACE = 0x40;
public static final int DEL_CHAR = 0x50;
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public static final int EOF = 0x04;
public static final int LINE_FEED = 0x0A;
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private Console console = new Console();
private Line line = new Line(console);
private boolean endOfFile = false;
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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();
}
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private void parseKey() throws IOException
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{
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Pattern pattern;
Scanner scanner = new Scanner(System.in);
pattern = Pattern.compile("(.{1})");
if(scanner.findWithinHorizon(pattern,0) != null)
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{
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int character = (int)scanner.match().group(1).charAt(0);
if(character >= 0x20 || character == EOF || character == BACKSPACE || character == RETURN_KEY)
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{
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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;
}
return;
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}
}
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pattern = Pattern.compile("\\^\\[\\[(.{1}).*");
if(scanner.findWithinHorizon(pattern,3) != null) //escape sequence
{
int character = scanner.match().group(1).charAt(0);
switch(character)
{
case FORWARD:
line.setCursorTo(line.getCursorPosition()+1);
break;
case BACKWARD:
line.setCursorTo(line.getCursorPosition()-1);
break;
case DEL:
line.delChar(DEL_FORWARD);
break;
case INSERT_KEY:
line.toggleMode();
break;
}
return;
}
pattern = Pattern.compile("\\^\\[O(\\w{1})");
if(scanner.findWithinHorizon(pattern,3) != null) //HOME or END
{
int character = (int)scanner.match().group(1).charAt(0);
switch(character)
{
case HOME:
line.setCursorTo(1);
break;
case END:
line.setCursorTo(line.length()+1);
break;
}
return;
}
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}
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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 "";
}
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try
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{
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while(!endOfFile)
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{
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parseKey();
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}
}
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catch(Exception e)
{
System.out.println("Error reading line");
return "";
}
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try
{
unsetRaw();
}
catch (Exception e)
{
System.out.println("Couldn't unset raw mode");
return "";
}
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System.out.println("");
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return line.toString();
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}
}
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/* 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
*/
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