/*
* This file is part of lanterna (http://code.google.com/p/lanterna/).
*
* lanterna is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see .
*
* Copyright (C) 2010-2015 Martin
*/
package com.googlecode.lanterna.input;
import java.util.List;
/**
* Character pattern that matches characters pressed while CTRL key is held down
*
* @author Martin, Andreas
*/
public class CtrlAndCharacterPattern implements CharacterPattern {
@Override
public Matching match(List seq) {
int size = seq.size(); char ch = seq.get(0);
if (size != 1) {
return null; // nope
}
if (ch < 32) {
// Control-chars: exclude lf,cr,Tab,Esc(^[), but still include ^\, ^], ^^ and ^_
char ctrlCode;
switch (ch) {
case '\n': case '\r': case '\t':
case KeyDecodingProfile.ESC_CODE: return null; // nope
case 0: /* ^@ */ ctrlCode = ' '; break;
case 28: /* ^\ */ ctrlCode = '\\'; break;
case 29: /* ^] */ ctrlCode = ']'; break;
case 30: /* ^^ */ ctrlCode = '^'; break;
case 31: /* ^_ */ ctrlCode = '_'; break;
default: ctrlCode = (char)('a' - 1 + ch);
}
KeyStroke ks = new KeyStroke( ctrlCode, true, false);
return new Matching( ks ); // yep
} else {
return null; // nope
}
}
}