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