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Styled XML parser is used by iText modules to parse HTML and XML
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/*
    This file is part of the iText (R) project.
    Copyright (c) 1998-2019 iText Group NV
    Authors: iText Software.

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License version 3
    as published by the Free Software Foundation with the addition of the
    following permission added to Section 15 as permitted in Section 7(a):
    FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
    ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
    OF THIRD PARTY RIGHTS

    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 http://www.gnu.org/licenses or write to
    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    Boston, MA, 02110-1301 USA, or download the license from the following URL:
    http://itextpdf.com/terms-of-use/

    The interactive user interfaces in modified source and object code versions
    of this program must display Appropriate Legal Notices, as required under
    Section 5 of the GNU Affero General Public License.

    In accordance with Section 7(b) of the GNU Affero General Public License,
    a covered work must retain the producer line in every PDF that is created
    or manipulated using iText.

    You can be released from the requirements of the license by purchasing
    a commercial license. Buying such a license is mandatory as soon as you
    develop commercial activities involving the iText software without
    disclosing the source code of your own applications.
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    For more information, please contact iText Software Corp. at this
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 */
package com.itextpdf.styledxmlparser.jsoup.select;

import com.itextpdf.styledxmlparser.jsoup.helper.StringUtil;
import com.itextpdf.styledxmlparser.jsoup.nodes.Element;

import com.itextpdf.io.util.MessageFormatUtil;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;

/**
 * Base combining (and, or) evaluator.
 */
abstract class CombiningEvaluator extends Evaluator {
    final ArrayList evaluators;
    int num = 0;

    CombiningEvaluator() {
        super();
        evaluators = new ArrayList();
    }

    CombiningEvaluator(Collection evaluators) {
        this();
        this.evaluators.addAll(evaluators);
        updateNumEvaluators();
    }

    Evaluator rightMostEvaluator() {
        return num > 0 ? evaluators.get(num - 1) : null;
    }

    void replaceRightMostEvaluator(Evaluator replacement) {
        evaluators.set(num - 1, replacement);
    }

    void updateNumEvaluators() {
        // used so we don't need to bash on size() for every match test
        num = evaluators.size();
    }

    static final class And extends CombiningEvaluator {
        And(Collection evaluators) {
            super(evaluators);
        }

        And(Evaluator... evaluators) {
            this(Arrays.asList(evaluators));
        }

        @Override
        public boolean matches(Element root, Element node) {
            for (int i = 0; i < num; i++) {
                Evaluator s = evaluators.get(i);
                if (!s.matches(root, node))
                    return false;
            }
            return true;
        }

        @Override
        public String toString() {
            return StringUtil.join(evaluators, " ");
        }
    }

    static final class Or extends CombiningEvaluator {
        /**
         * Create a new Or evaluator. The initial evaluators are ANDed together and used as the first clause of the OR.
         * @param evaluators initial OR clause (these are wrapped into an AND evaluator).
         */
        Or(Collection evaluators) {
            super();
            if (num > 1)
                this.evaluators.add(new And(evaluators));
            else // 0 or 1
                this.evaluators.addAll(evaluators);
            updateNumEvaluators();
        }

        Or() {
            super();
        }

        public void add(Evaluator e) {
            evaluators.add(e);
            updateNumEvaluators();
        }

        @Override
        public boolean matches(Element root, Element node) {
            for (int i = 0; i < num; i++) {
                Evaluator s = evaluators.get(i);
                if (s.matches(root, node))
                    return true;
            }
            return false;
        }

        @Override
        public String toString() {
            return MessageFormatUtil.format(":or{0}", evaluators);
        }
    }
}