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 com.github._1c_syntax.bsl.parser.BSLParser;
  import com.github._1c_syntax.bsl.parser.BSLParserBaseVisitor;
  import lombok.Getter;
  import org.antlr.v4.runtime.tree.ParseTree;
  import org.eclipse.lsp4j.FoldingRange;
  import org.eclipse.lsp4j.FoldingRangeKind;
  import org.springframework.stereotype.Component;
  
  import java.util.ArrayDeque;
  import java.util.ArrayList;
  import java.util.Deque;
  import java.util.List;
  
  /**
   * Сапплаер областей сворачивания инструкций препроцессору <code>#Если ... #КонецЕсли</code>.
   */
  @Component
  public class PreprocIfFoldingRangeSupplier implements FoldingRangeSupplier {
  
    @Override
    public List<FoldingRange> getFoldingRanges(DocumentContext documentContext) {
      PreprocIfVisitor preprocIfVisitor = new PreprocIfVisitor();
      preprocIfVisitor.visitFile(documentContext.getAst());
      return preprocIfVisitor.getRegionRanges();
    }
  
    private static class PreprocIfVisitor extends BSLParserBaseVisitor<ParseTree> {
  
      @Getter
      private final List<FoldingRange> regionRanges = new ArrayList<>();
      private final Deque<BSLParser.Preproc_ifContext> preprocIfRegionStack = new ArrayDeque<>();
  
      @Override
      public ParseTree visitPreproc_if(BSLParser.Preproc_ifContext ctx) {
        preprocIfRegionStack.push(ctx);
        return super.visitPreproc_if(ctx);
      }
  
      @Override
      public ParseTree visitPreproc_endif(BSLParser.Preproc_endifContext ctx) {
  
        if (preprocIfRegionStack.isEmpty()) {
          return super.visitPreproc_endif(ctx);
        }
  
        BSLParser.Preproc_ifContext regionStart = preprocIfRegionStack.pop();
  
        int start = regionStart.getStart().getLine();
        int stop = ctx.getStop().getLine();
  
        FoldingRange foldingRange = new FoldingRange(start - 1, stop - 1);
        foldingRange.setKind(FoldingRangeKind.Region);
  
        regionRanges.add(foldingRange);
  
        return super.visitPreproc_endif(ctx);
      }
    }
  }
  