StringUtils.java

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/*
 * This file is part of JXClient, the Fullscreen Java Crossfire Client.
 *
 * JXClient is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * JXClient 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with JXClient; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Copyright (C) 2005-2008 Yann Chachkoff.
 * Copyright (C) 2006-2011 Andreas Kirschbaum.
 */

package com.realtime.crossfire.jxclient.util;

import java.util.ArrayList;
import java.util.List;
import java.util.regex.Pattern;
import org.jetbrains.annotations.NotNull;

public class StringUtils {

    @NotNull
    private static final Pattern PATTERN_LEADING_WHITESPACE = Pattern.compile("^[ \t]+");

    private StringUtils() {
    }

    @NotNull
    public static String trimLeading(@NotNull final CharSequence str) {
        return PATTERN_LEADING_WHITESPACE.matcher(str).replaceAll("");
    }

    @NotNull
    public static String[] splitFields(@NotNull final String line) throws UnterminatedTokenException {
        final List<String> tokens = new ArrayList<>(64);

        final char[] chars = line.toCharArray();

        int i = 0;
        while (i < chars.length) {
            while (i < chars.length && (chars[i] == ' ' || chars[i] == '\t')) {
                i++;
            }
            final int start;
            final int end;
            if (i < chars.length && (chars[i] == '"' || chars[i] == '\'')) {
                // quoted token
                final char quoteChar = chars[i++];
                start = i;
                while (i < chars.length && chars[i] != quoteChar) {
                    i++;
                }
                if (i >= chars.length) {
                    throw new UnterminatedTokenException(line.substring(start-1));
                }
                end = i;
                i++;
            } else {
                // unquoted token
                start = i;
                while (i < chars.length && chars[i] != ' ' && chars[i] != '\t') {
                    i++;
                }
                end = i;
            }
            tokens.add(line.substring(start, end));
        }

        return tokens.toArray(new String[tokens.size()]);
    }

}