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SQLLinter/Infrastructure/Rules/CaseSensitiveVariablesRule.cs

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+using Microsoft.SqlServer.TransactSql.ScriptDom;
+using SQLLinter.Common;
+
+namespace SQLLinter.Infrastructure.Rules;
+
+/// <summary>
+/// Имена переменных будут использовать общий регистр
+/// </summary>
+public class CaseSensitiveVariablesRule : BaseRuleVisitor, IRule
+{
+    private readonly List<string> variableNames;
+
+    public CaseSensitiveVariablesRule()
+    {
+        this.variableNames = new List<string>();
+    }
+
+    public override string Text => "Ожидается, что имена переменных будут использовать один регистр: {0} (DECLARE {1})";
+
+    public override void Visit(TSqlBatch node)
+    {
+        variableNames.Clear();
+    }
+
+    public override void Visit(DeclareVariableStatement node)
+    {
+        foreach (var declaration in node.Declarations)
+        {
+            variableNames.Add(declaration.VariableName.Value);
+        }
+    }
+
+    public override void Visit(VariableReference node)
+    {
+        var variableName = node.Name;
+        var caseInsensitiveMatch = variableNames.Where(v => v.ToUpper() == variableName.ToUpper());
+
+        if (!caseInsensitiveMatch.Any()) return;
+
+        var declareName = caseInsensitiveMatch.First();
+
+        if (declareName == variableName) return;
+
+        AddViolation(node, variableName, declareName);
+    }
+}