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/*
    This file is part of the iText (R) project.
    Copyright (c) 1998-2024 Apryse Group NV
    Authors: Apryse Software.

    This program is offered under a commercial and under the AGPL license.
    For commercial licensing, contact us at https://itextpdf.com/sales.  For AGPL licensing, see below.

    AGPL licensing:
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero 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 Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with this program.  If not, see .
 */
package com.itextpdf.pdfua.checkers.utils;

import java.util.regex.Pattern;

/**
 * This class is a validator for IETF BCP 47 language tag (RFC 5646)
 */
public class BCP47Validator {
    private static String regular = "(art-lojban|cel-gaulish|no-bok|no-nyn|zh-guoyu|zh-hakka|zh-min|zh-min-nan|zh-xiang)";
    private static String irregular = "(en-GB-oed|i-ami|i-bnn|i-default|i-enochian|i-hak|i-klingon|i-lux|i-mingo|i-navajo|i-pwn|i-tao|i-tay|i-tsu|sgn-BE-FR|sgn-BE-NL|sgn-CH-DE)";
    private static String grandfathered = "(?" + irregular + "|" + regular + ")";
    private static String privateUse = "(?x(-[A-Za-z0-9]{1,8})+)";
    private static String singleton = "[0-9A-WY-Za-wy-z]";
    private static String extension = "(?" + singleton + "(-[A-Za-z0-9]{2,8})+)";
    private static String variant = "(?[A-Za-z0-9]{5,8}|[0-9][A-Za-z0-9]{3})";
    private static String region = "(?[A-Za-z]{2}|[0-9]{3})";
    private static String script = "(?