Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * * Copyright (C) 2013-2014 Matt Baxter http://kitteh.org
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use, copy,
 * modify, merge, publish, distribute, sublicense, and/or sell copies
 * of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main {
    private static final char CTCP_DELIMITER = '\u0001';
    private static final char CTCP_MQUOTE = '\u0016';
    private static final Pattern CTCP_ESCAPED_CHAR = Pattern.compile("([" + CTCP_MQUOTE + "\\\\])(.)");

    /**
     * Converts a given message from CTCP escaping.
     *
     * @param message message to convert
     * @return converted message
     */
    static String fromCTCP(String message) {
        message = message.substring(1); // Strip the starting delimiter
        message = message.substring(0, message.indexOf(CTCP_DELIMITER)); // Strip the second delimiter
        StringBuilder builder = new StringBuilder();
        int currentIndex = 0;
        Matcher matcher = CTCP_ESCAPED_CHAR.matcher(message);
        while (matcher.find()) {
            if (matcher.start() > currentIndex) {
                builder.append(message.substring(currentIndex, matcher.start()));
            }
            switch (matcher.group(1)) {
            case CTCP_MQUOTE + "":
                switch (matcher.group(2)) {
                case "n":
                    builder.append('\n');
                    break;
                case "r":
                    builder.append('\r');
                    break;
                case "0":
                    builder.append('\u0000');
                    break;
                default:
                    builder.append(matcher.group(2)); // If not one of the above, disregard the MQUOTE. If MQUOTE, it's covered here anyway.
                }
                break;
            case "\\":
                switch (matcher.group(2)) {
                case "a":
                    builder.append(CTCP_DELIMITER);
                    break;
                default:
                    builder.append(matcher.group(2)); // If not one of the above, disregard the \. If \, it's covered here anyway.
                }
            }
            currentIndex = matcher.end();
        }
        if (currentIndex < message.length()) {
            builder.append(message.substring(currentIndex));
        }
        return builder.toString();
    }
}