/*

 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package propertiesparser.parser;

import java.util.regex.Pattern;

/**

 * A line of text within the message file.

 * The lines form a doubly linked list for simple navigation.

 */

public class MessageLine {

    static final Pattern emptyOrCommentPattern = Pattern.compile("( *#.*)?");

    static final Pattern typePattern = Pattern.compile("[-\\\\'A-Z\\.a-z ]+( \\([-A-Za-z 0-9]+\\))?");

    static final Pattern infoPattern = Pattern.compile(String.format("# ([0-9]+: %s, )*[0-9]+: %s",

            typePattern.pattern(), typePattern.pattern()));

    public String text;

    MessageLine prev;

    MessageLine next;

    MessageLine(String text) {

        this.text = text;

    }

    public boolean isEmptyOrComment() {

        return emptyOrCommentPattern.matcher(text).matches();

    }

    public boolean isInfo() {

        return infoPattern.matcher(text).matches();

    }

    boolean hasContinuation() {

        return (next != null) && text.endsWith("\\");

    }

    MessageLine append(String text) {

        MessageLine l = new MessageLine(text);

        append(l);

        return l;

    }

    void append(MessageLine l) {

        assert l.prev == null && l.next == null;

        l.prev = this;

        l.next = next;

        if (next != null) {

            next.prev = l;

        }

        next = l;

    }

}