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// ParameterOnlyAssignedIssue.cs
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// Mansheng Yang <lightyang0@gmail.com>
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// Copyright (c) 2012 Mansheng Yang <lightyang0@gmail.com>
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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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// 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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// 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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using ICSharpCode.NRefactory.Semantics;
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namespace ICSharpCode.NRefactory.CSharp.Refactoring
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[IssueDescription ("Parameter is only assigned",
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Description = "Parameter is assigned but its value is never used.",
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Category = IssueCategories.CodeQualityIssues,
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Severity = Severity.Warning,
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IssueMarker = IssueMarker.Underline)]
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public class ParameterOnlyAssignedIssue : VariableOnlyAssignedIssue
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public override System.Collections.Generic.IEnumerable<CodeIssue> GetIssues(BaseRefactoringContext context)
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return new GatherVisitor(context).GetIssues ();
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private class GatherVisitor : GatherVisitorBase<ParameterOnlyAssignedIssue>
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public GatherVisitor(BaseRefactoringContext ctx)
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public override void VisitParameterDeclaration(ParameterDeclaration parameterDeclaration)
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base.VisitParameterDeclaration(parameterDeclaration);
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var resolveResult = ctx.Resolve(parameterDeclaration) as LocalResolveResult;
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if (resolveResult == null)
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var parameterModifier = parameterDeclaration.ParameterModifier;
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if (parameterModifier == ParameterModifier.Out || parameterModifier == ParameterModifier.Ref ||
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!TestOnlyAssigned(ctx, parameterDeclaration.Parent, resolveResult.Variable)) {
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AddIssue(parameterDeclaration.NameToken,
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ctx.TranslateString("Parameter is assigned but its value is never used"));