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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 System.Collections.Generic;
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namespace ICSharpCode.NRefactory.CSharp.Refactoring
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public static class LocalVariableNamePicker
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public static string PickSafeName (AstNode node, IEnumerable<string> candidates)
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var existingNames = new VariableNameCollector ().Collect (node);
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return candidates.FirstOrDefault (name => !existingNames.Contains (name));
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class VariableNameCollector : DepthFirstAstVisitor
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private ISet<string> variableNames = new HashSet<string> ();
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public ISet<string> Collect (AstNode node)
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variableNames.Clear ();
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node.AcceptVisitor (this);
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public override void VisitParameterDeclaration (ParameterDeclaration parameterDeclaration)
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variableNames.Add (parameterDeclaration.Name);
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base.VisitParameterDeclaration (parameterDeclaration);
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public override void VisitVariableInitializer (VariableInitializer variableInitializer)
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variableNames.Add (variableInitializer.Name);
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base.VisitVariableInitializer (variableInitializer);
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public override void VisitForeachStatement (ForeachStatement foreachStatement)
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variableNames.Add (foreachStatement.VariableName);
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base.VisitForeachStatement (foreachStatement);