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