| 1 | /* |
| 2 | * This file is part of lanterna (http://code.google.com/p/lanterna/). |
| 3 | * |
| 4 | * lanterna is free software: you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU Lesser General Public License as published by |
| 6 | * the Free Software Foundation, either version 3 of the License, or |
| 7 | * (at your option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU Lesser General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU Lesser General Public License |
| 15 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 16 | * |
| 17 | * Copyright (C) 2010-2015 Martin |
| 18 | */ |
| 19 | package com.googlecode.lanterna.input; |
| 20 | |
| 21 | import java.util.List; |
| 22 | |
| 23 | /** |
| 24 | * Character pattern that matches characters pressed while ALT and CTRL keys are held down |
| 25 | * |
| 26 | * @author Martin, Andreas |
| 27 | */ |
| 28 | public class CtrlAltAndCharacterPattern implements CharacterPattern { |
| 29 | |
| 30 | @Override |
| 31 | public Matching match(List<Character> seq) { |
| 32 | int size = seq.size(); |
| 33 | if (size > 2 || seq.get(0) != KeyDecodingProfile.ESC_CODE) { |
| 34 | return null; // nope |
| 35 | } |
| 36 | if (size == 1) { |
| 37 | return Matching.NOT_YET; // maybe later |
| 38 | } |
| 39 | char ch = seq.get(1); |
| 40 | if (ch < 32) { |
| 41 | // Control-chars: exclude Esc(^[), but still include ^\, ^], ^^ and ^_ |
| 42 | char ctrlCode; |
| 43 | switch (ch) { |
| 44 | case KeyDecodingProfile.ESC_CODE: return null; // nope |
| 45 | case 0: /* ^@ */ ctrlCode = ' '; break; |
| 46 | case 28: /* ^\ */ ctrlCode = '\\'; break; |
| 47 | case 29: /* ^] */ ctrlCode = ']'; break; |
| 48 | case 30: /* ^^ */ ctrlCode = '^'; break; |
| 49 | case 31: /* ^_ */ ctrlCode = '_'; break; |
| 50 | default: ctrlCode = (char)('a' - 1 + ch); |
| 51 | } |
| 52 | KeyStroke ks = new KeyStroke( ctrlCode, true, true); |
| 53 | return new Matching( ks ); // yep |
| 54 | } else { |
| 55 | return null; // nope |
| 56 | } |
| 57 | } |
| 58 | } |