code: ///////////////////////////////////////////////////////////////////////////////////////////////
  // checkstyle: Checks Java source code and other text files for adherence to a set of rules.
  // Copyright (C) 2001-2023 the original author or authors.
  //
  // This library is free software; you can redistribute it and/or
  // modify it under the terms of the GNU Lesser General Public
  // License as published by the Free Software Foundation; either
  // version 2.1 of the License, or (at your option) any later version.
  //
  // This library 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
  // Lesser General Public License for more details.
  //
  // You should have received a copy of the GNU Lesser General Public
  // License along with this library; if not, write to the Free Software
  // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  ///////////////////////////////////////////////////////////////////////////////////////////////
  
  package com.puppycrawl.tools.checkstyle;
  
  import java.io.File;
  import java.io.IOException;
  import java.nio.charset.StandardCharsets;
  import java.util.List;
  import java.util.Locale;
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  import java.util.stream.Collectors;
  
  import com.puppycrawl.tools.checkstyle.api.CheckstyleException;
  import com.puppycrawl.tools.checkstyle.api.DetailAST;
  import com.puppycrawl.tools.checkstyle.api.FileText;
  import com.puppycrawl.tools.checkstyle.xpath.XpathQueryGenerator;
  
  /**
   * Class for constructing xpath queries to suppress nodes
   * with specified line and column number.
   */
  public final class SuppressionsStringPrinter {
  
      /** Line and column number config value pattern. */
      private static final Pattern VALID_SUPPRESSION_LINE_COLUMN_NUMBER_REGEX =
              Pattern.compile("^(\\d+):(\\d+)$");
  
      /** OS specific line separator. */
      private static final String LINE_SEPARATOR = System.getProperty("line.separator");
  
      /** Prevent instances. */
      private SuppressionsStringPrinter() {
          // no code
      }
  
      /**
       * Prints generated suppressions.
       *
       * @param file the file to process.
       * @param suppressionLineColumnNumber line and column number of the suppression
       * @param tabWidth length of the tab character
       * @return generated suppressions.
       * @throws IOException if the file could not be read.
       * @throws IllegalStateException if suppressionLineColumnNumber is not of a valid format.
       * @throws CheckstyleException if the file is not a Java source.
       */
      public static String printSuppressions(File file, String suppressionLineColumnNumber,
                                             int tabWidth) throws IOException, CheckstyleException {
          final Matcher matcher =
                  VALID_SUPPRESSION_LINE_COLUMN_NUMBER_REGEX.matcher(suppressionLineColumnNumber);
          if (!matcher.matches()) {
              final String exceptionMsg = String.format(Locale.ROOT,
                      "%s does not match valid format 'line:column'.",
                      suppressionLineColumnNumber);
              throw new IllegalStateException(exceptionMsg);
          }
  
          final FileText fileText = new FileText(file.getAbsoluteFile(),
                  System.getProperty("file.encoding", StandardCharsets.UTF_8.name()));
          final DetailAST detailAST =
                  JavaParser.parseFileText(fileText, JavaParser.Options.WITH_COMMENTS);
          final int lineNumber = Integer.parseInt(matcher.group(1));
          final int columnNumber = Integer.parseInt(matcher.group(2));
          return generate(fileText, detailAST, lineNumber, columnNumber, tabWidth);
      }
  
      /**
       * Creates {@code XpathQueryGenerator} instance and generates suppressions.
       *
       * @param fileText {@code FileText} object.
       * @param detailAST {@code DetailAST} object.
       * @param lineNumber line number.
       * @param columnNumber column number.
       * @param tabWidth length of the tab character.
       * @return generated suppressions.
       */
      private static String generate(FileText fileText, DetailAST detailAST, int lineNumber,
                                     int columnNumber, int tabWidth) {
          final XpathQueryGenerator queryGenerator =
                  new XpathQueryGenerator(detailAST, lineNumber, columnNumber, fileText,
                          tabWidth);
          final List<String> suppressions = queryGenerator.generate();
          return suppressions.stream().collect(Collectors.joining(LINE_SEPARATOR,
                  "", LINE_SEPARATOR));
      }
  }
  