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UnusedStringBuilderBase.cs
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UnusedStringBuilderBase.cs
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/*
* SonarAnalyzer for .NET
* Copyright (C) 2015-2023 SonarSource SA
* mailto: contact AT sonarsource DOT com
*
* This program 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 of the License, or (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
namespace SonarAnalyzer.Rules;
public abstract class UnusedStringBuilderBase<TSyntaxKind, TVariableDeclarator, TInvocationExpression, TReturnStatement> : SonarDiagnosticAnalyzer<TSyntaxKind>
where TSyntaxKind : struct
where TVariableDeclarator : SyntaxNode
where TInvocationExpression : SyntaxNode
where TReturnStatement : SyntaxNode
{
private const string DiagnosticId = "S3063";
protected override string MessageFormat => """Remove this "StringBuilder"; ".ToString()" is never called.""";
protected abstract string GetVariableName(TVariableDeclarator declaration);
protected abstract bool NeedsToTrack(TVariableDeclarator declaration, SemanticModel semanticModel);
protected abstract SyntaxNode GetAncestorBlock(TVariableDeclarator declaration);
protected abstract bool IsIsStringInvoked(string variableName, IList<TInvocationExpression> invocations);
protected abstract bool IsPassedToMethod(string variableName, IList<TInvocationExpression> invocations);
protected abstract bool IsReturned(string variableName, IList<TReturnStatement> returnStatements);
protected UnusedStringBuilderBase() : base(DiagnosticId) { }
protected sealed override void Initialize(SonarAnalysisContext context) =>
context.RegisterNodeAction(Language.GeneratedCodeRecognizer, c =>
{
var variableDeclaration = (TVariableDeclarator)c.Node;
if (!NeedsToTrack(variableDeclaration, c.SemanticModel))
{
return;
}
var variableName = GetVariableName(variableDeclaration);
var block = GetAncestorBlock(variableDeclaration);
if (block == null || string.IsNullOrEmpty(variableName))
{
return;
}
var invocations = block.DescendantNodes().OfType<TInvocationExpression>().ToList();
if (IsIsStringInvoked(variableName, invocations)
|| IsPassedToMethod(variableName, invocations)
|| IsReturned(variableName, block.DescendantNodes().OfType<TReturnStatement>().ToList()))
{
return;
}
c.ReportIssue(Diagnostic.Create(Rule, variableDeclaration.GetLocation()));
}, Language.SyntaxKind.VariableDeclarator);
}