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Styled XML parser is used by iText 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) 1998-2024 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.styledxmlparser.css.page;

import com.itextpdf.styledxmlparser.css.CssDeclaration;
import com.itextpdf.styledxmlparser.css.CssNestedAtRule;
import com.itextpdf.styledxmlparser.css.CssRuleName;
import com.itextpdf.styledxmlparser.css.CssStatement;
import com.itextpdf.styledxmlparser.css.selector.CssPageSelector;
import com.itextpdf.styledxmlparser.css.selector.ICssSelector;
import com.itextpdf.styledxmlparser.css.util.CssUtils;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

/**
 * {@link CssNestedAtRule} implementation for page rules.
 */
public class CssPageRule extends CssNestedAtRule {

    /** The page selectors. */
    private List pageSelectors;

    /**
     * Creates a new {@link CssPageRule} instance.
     *
     * @param ruleParameters the rule parameters
     */
    public CssPageRule(String ruleParameters) {
        super(CssRuleName.PAGE, ruleParameters);
        pageSelectors = new ArrayList<>();

        String[] selectors = ruleParameters.split(",");
        for (int i = 0; i < selectors.length; i++) {
            selectors[i] = CssUtils.removeDoubleSpacesAndTrim(selectors[i]);
        }
        for (String currentSelectorStr : selectors) {
            pageSelectors.add(new CssPageSelector(currentSelectorStr));
        }
    }

    /* (non-Javadoc)
     * @see com.itextpdf.styledxmlparser.css.CssNestedAtRule#addBodyCssDeclarations(java.util.List)
     */
    @Override
    public void addBodyCssDeclarations(List cssDeclarations) {
        // TODO DEVSIX-6364 Fix the body declarations duplication for each pageSelector part
        //      Due to this for-loop, on toString method call for the CssPageRule instance
        //      all the body declarations will be duplicated for each pageSelector part.
        //      This potentially could lead to a nasty behaviour when declarations will double
        //      for each read-write iteration of the same css-file (however, this use case seems
        //      to be unlikely to happen).
        //      Possible solution would be to split single page rule with compound selector into
        //      several page rules with simple selectors on addition of the page rule to it's parent.
        //
        //      Also, the same concerns this method implementation in CssMarginRule class.
        //
        //      See CssStyleSheetParserTest#test11 test.
        for (ICssSelector pageSelector : pageSelectors) {
            this.body.add(new CssNonStandardRuleSet(pageSelector, cssDeclarations));
        }
    }  
    
    /* (non-Javadoc)
     * @see com.itextpdf.styledxmlparser.css.CssNestedAtRule#addStatementToBody(com.itextpdf.styledxmlparser.css.CssStatement)
     */
    @Override
    public void addStatementToBody(CssStatement statement) {
        if (statement instanceof CssMarginRule) {
            ((CssMarginRule) statement).setPageSelectors(pageSelectors);
        }
        this.body.add(statement);
    }

    /* (non-Javadoc)
     * @see com.itextpdf.styledxmlparser.css.CssNestedAtRule#addStatementsToBody(java.util.Collection)
     */
    @Override
    public void addStatementsToBody(Collection statements) {
        for (CssStatement statement : statements) {
            addStatementToBody(statement);
        }
    }

}