SQLLint/SQLLinter/Infrastructure/Rules/InnerJoinRule.cs

using Microsoft.SqlServer.TransactSql.ScriptDom;
using SQLLinter.Common;

namespace SQLLinter.Infrastructure.Rules;

public class InnerJoinRule : BaseRuleVisitor
{
    public override string Text => "Используйте полную запись INNER JOIN.";

    public override void Visit(QualifiedJoin node)
    {
        if (node.QualifiedJoinType != QualifiedJoinType.Inner)
            return;

        var tokens = node.ScriptTokenStream;
        if (tokens == null) return;

        var secondIndex = node.SecondTableReference.FirstTokenIndex;

        int start = node.FirstTableReference.LastTokenIndex;
        int end = node.SecondTableReference.FirstTokenIndex;

        bool hasInner = tokens
            .Skip(start)
            .Take(end - start + 1)
            .Any(t => t.TokenType == TSqlTokenType.Inner);

        if (!hasInner)
        {
            var joinToken = tokens
                .Skip(start)
                .Take(end - start + 1)
                .FirstOrDefault(t => t.TokenType == TSqlTokenType.Join);

            if (joinToken != null)
            {
                AddViolation(Name, Text, joinToken.Line, joinToken.Column);
            }
            else
            {
                AddViolation(node);
            }
        }
    }
}