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Language Server Protocol implementation for 1C (BSL) - 1C:Enterprise 8 and OneScript languages.

There is a newer version: 0.24.0-rc.1

/*
 * This file is a part of BSL Language Server.
 *
 * Copyright (c) 2018-2024
 * Alexey Sosnoviy , Nikita Fedkin  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.diagnostics;

import com.github._1c_syntax.bsl.languageserver.diagnostics.metadata.DiagnosticMetadata;
import com.github._1c_syntax.bsl.languageserver.diagnostics.metadata.DiagnosticSeverity;
import com.github._1c_syntax.bsl.languageserver.diagnostics.metadata.DiagnosticTag;
import com.github._1c_syntax.bsl.languageserver.diagnostics.metadata.DiagnosticType;
import com.github._1c_syntax.bsl.languageserver.utils.Trees;
import com.github._1c_syntax.bsl.parser.BSLParser;
import org.antlr.v4.runtime.Token;
import org.antlr.v4.runtime.tree.ParseTree;

import java.util.Optional;

@DiagnosticMetadata(
  type = DiagnosticType.ERROR,
  severity = DiagnosticSeverity.BLOCKER,
  minutesToFix = 1,
  tags = {
    DiagnosticTag.SUSPICIOUS,
    DiagnosticTag.BRAINOVERLOAD
  }
)
public class UnaryPlusInConcatenationDiagnostic extends AbstractVisitorDiagnostic {

  @Override
  public ParseTree visitMember(BSLParser.MemberContext ctx) {

    if (ctx.constValue() != null && ctx.constValue().numeric() != null) {
      return super.visitMember(ctx);
    }

    BSLParser.UnaryModifierContext unaryModifier = ctx.unaryModifier();
    if (unaryModifier == null || unaryModifier.PLUS() == null) {
      return super.visitMember(ctx);
    }

    int tokenIndex = unaryModifier.getStart().getTokenIndex();
    if (tokenIndex == 0) {
      return super.visitMember(ctx);
    }

    Optional previousToken = Trees.getPreviousTokenFromDefaultChannel(documentContext.getTokens(), tokenIndex);
    previousToken
      .filter(token -> "+".equals(token.getText()))
      .ifPresent(token -> diagnosticStorage.addDiagnostic(unaryModifier.getStart()));

    return super.visitMember(ctx);
  }

}