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Java library for creating text-based terminal GUIs

There is a newer version: 3.2.0-alpha1

/*
 * 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) 2010-2020 Martin Berglund
 */
package com.googlecode.lanterna.input;

import java.util.List;

/**
 * Character pattern that matches one character as one KeyStroke with the character that was read
 * 
 * @author Martin, Andreas
 */
public class NormalCharacterPattern implements CharacterPattern {
    @Override
    public Matching match(List seq) {
        if (seq.size() != 1) {
            return null; // nope
        }
        char ch = seq.get(0);
        if (isPrintableChar(ch)) {
            KeyStroke ks = new KeyStroke(ch, false, false);
            return new Matching( ks );
        } else {
            return null; // nope
        }
    }

    /**
     * From http://stackoverflow.com/questions/220547/printable-char-in-java
     * @param c character to test
     * @return True if this is a 'normal', printable character, false otherwise
     */
    private static boolean isPrintableChar(char c) {
        if (Character.isISOControl(c)) { return false; }
        Character.UnicodeBlock block = Character.UnicodeBlock.of(c);
        return block != null && block != Character.UnicodeBlock.SPECIALS;
    }
}