content: /*
   * This file is a part of BSL Language Server.
   *
   * Copyright (c) 2018-2025
   * Alexey Sosnoviy <labotamy@gmail.com>, Nikita Fedkin <nixel2007@gmail.com> and contributors
   *
   * SPDX-License-Identifier: LGPL-3.0-or-later
   *
   * BSL Language Server 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 3.0 of the License, or (at your option) any later version.
   *
   * BSL Language Server 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 BSL Language Server.
   */
  package com.github._1c_syntax.bsl.languageserver.folding;
  
  import com.github._1c_syntax.bsl.languageserver.context.DocumentContext;
  import org.antlr.v4.runtime.Token;
  import org.eclipse.lsp4j.FoldingRange;
  import org.eclipse.lsp4j.FoldingRangeKind;
  
  import java.util.ArrayList;
  import java.util.List;
  
  /**
   * Абстрактный сапплаер для получения областей сворачивания комментариев.
   */
  public abstract class AbstractCommentFoldingRangeSupplier implements FoldingRangeSupplier {
  
    @Override
    public List<FoldingRange> getFoldingRanges(DocumentContext documentContext) {
      List<FoldingRange> foldingRanges = new ArrayList<>();
  
      List<Token> comments = getComments(documentContext);
  
      int lastRangeStart = -1;
      int previousLine = -1;
  
      for (Token token : comments) {
        int tokenLine = token.getLine();
  
        if (tokenLine != previousLine + 1) {
          if (lastRangeStart != previousLine) {
            FoldingRange foldingRange = new FoldingRange(lastRangeStart - 1, previousLine - 1);
            foldingRange.setKind(FoldingRangeKind.Comment);
  
            foldingRanges.add(foldingRange);
          }
          // new range
          lastRangeStart = tokenLine;
        }
  
        previousLine = tokenLine;
      }
  
      // add last range
      if (lastRangeStart != previousLine) {
        FoldingRange foldingRange = new FoldingRange(lastRangeStart - 1, previousLine - 1);
        foldingRange.setKind(FoldingRangeKind.Comment);
  
        foldingRanges.add(foldingRange);
      }
      return foldingRanges;
    }
  
    /**
     * @param documentContext Контекст документа, для которого надо получить список комментариев
     * @return Список токенов-комментариев
     */
    protected abstract List<Token> getComments(DocumentContext documentContext);
  }
  