// // NamePicker.cs // // Author: // Mansheng Yang // // Copyright (c) 2012 Mansheng Yang // // 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 candidates) { var existingNames = new VariableNameCollector ().Collect (node); return candidates.FirstOrDefault (name => !existingNames.Contains (name)); } class VariableNameCollector : DepthFirstAstVisitor { private ISet variableNames = new HashSet (); public ISet 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); } } } }