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Styled XML parser is used by iText7 modules to parse HTML and XML

There is a newer version: 9.0.0

/*
    This file is part of the iText (R) project.
    Copyright (c) 1998-2023 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.styledxmlparser.util;

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

/**
 * Split CSS 'font-family' string into list of font-families or generic-families
 */
public final class FontFamilySplitterUtil {

    private static final Pattern FONT_FAMILY_PATTERN = Pattern.compile("^ *([\\w-]+) *$");
    private static final Pattern FONT_FAMILY_PATTERN_QUOTED = Pattern.compile("^ *(('[\\w -]+')|(\"[\\w -]+\")) *$");
    private static final Pattern FONT_FAMILY_PATTERN_QUOTED_SELECT = Pattern.compile("[\\w-]+( +[\\w-]+)*");

    public static List splitFontFamily(String fontFamilies) {
        if (fontFamilies == null) {
            return null;
        }
        String[] names = fontFamilies.split(",");
        List result = new ArrayList<>(names.length);
        for (String name : names) {
            // TODO DEVSIX-2534 improve pattern matching according to CSS specification. E.g. unquoted font-families with spaces.
            if (FONT_FAMILY_PATTERN.matcher(name).matches()) {
                result.add(name.trim());
            } else if (FONT_FAMILY_PATTERN_QUOTED.matcher(name).matches()) {
                Matcher selectMatcher = FONT_FAMILY_PATTERN_QUOTED_SELECT.matcher(name);
                if (selectMatcher.find()) {
                    result.add(selectMatcher.group());
                }
            }
        }
        return result;
    }

    public static String removeQuotes(String fontFamily) {
        Matcher selectMatcher = FONT_FAMILY_PATTERN_QUOTED_SELECT.matcher(fontFamily);
        if (selectMatcher.find()) {
            return selectMatcher.group();
        }
        return null;
    }
}