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//
// LocalVariableNotUsedIssue.cs
//
// Author:
// Mansheng Yang <lightyang0@gmail.com>
//
// Copyright (c) 2012 Mansheng Yang <lightyang0@gmail.com>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
using ICSharpCode.NRefactory.Semantics;
using System.Linq;
using ICSharpCode.NRefactory.TypeSystem;
using ICSharpCode.NRefactory.Refactoring;
namespace ICSharpCode.NRefactory.CSharp.Refactoring
{
[IssueDescription ("Unused local variable",
Description = "Local variable is never used.",
Category = IssueCategories.Redundancies,
Severity = Severity.Warning,
IssueMarker = IssueMarker.GrayOut,
PragmaWarning = 163,
ResharperDisableKeyword = "UnusedVariable.Compiler")]
public class LocalVariableNotUsedIssue : ICodeIssueProvider
{
#region ICodeIssueProvider implementation
public System.Collections.Generic.IEnumerable<CodeIssue> GetIssues(BaseRefactoringContext context)
{
return new GatherVisitor (context).GetIssues ();
}
#endregion
class GatherVisitor : GatherVisitorBase<LocalVariableNotUsedIssue>
{
public GatherVisitor (BaseRefactoringContext ctx)
: base (ctx)
{
}
public override void VisitVariableInitializer (VariableInitializer variableInitializer)
{
base.VisitVariableInitializer (variableInitializer);
// check if variable is assigned
if (!variableInitializer.Initializer.IsNull)
return;
var decl = variableInitializer.Parent as VariableDeclarationStatement;
if (decl == null)
return;
var resolveResult = ctx.Resolve (variableInitializer) as LocalResolveResult;
if (resolveResult == null)
return;
if (IsUsed (decl.Parent, resolveResult.Variable, variableInitializer))
return;
AddIssue (variableInitializer.NameToken, ctx.TranslateString ("Remove unused local variable"),
script =>
{
if (decl.Variables.Count == 1) {
script.Remove (decl);
} else {
var newDeclaration = (VariableDeclarationStatement)decl.Clone ();
newDeclaration.Variables.Remove (
newDeclaration.Variables.FirstOrNullObject (v => v.Name == variableInitializer.Name));
script.Replace (decl, newDeclaration);
}
});
}
public override void VisitForeachStatement (ForeachStatement foreachStatement)
{
base.VisitForeachStatement (foreachStatement);
var resolveResult = ctx.Resolve (foreachStatement.VariableNameToken) as LocalResolveResult;
if (resolveResult == null)
return;
if (IsUsed (foreachStatement, resolveResult.Variable, foreachStatement.VariableNameToken))
return;
AddIssue (foreachStatement.VariableNameToken, ctx.TranslateString ("Local variable is never used"));
}
bool IsUsed(AstNode rootNode, IVariable variable, AstNode variableNode)
{
return ctx.FindReferences(rootNode, variable).Any(result => result.Node != variableNode);
}
}
}
}
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