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// VariableLookupVisitor.cs
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// Mike Krüger <mkrueger@xamarin.com>
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// Copyright (c) 2012 Xamarin Inc. (http://xamarin.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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using ICSharpCode.NRefactory.Semantics;
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using ICSharpCode.NRefactory.TypeSystem;
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namespace ICSharpCode.NRefactory.CSharp.Refactoring.ExtractMethod
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class VariableLookupVisitor : DepthFirstAstVisitor
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readonly RefactoringContext context;
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public List<IVariable> UsedVariables = new List<IVariable> ();
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TextLocation startLocation = TextLocation.Empty;
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TextLocation endLocation = TextLocation.Empty;
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public VariableLookupVisitor (RefactoringContext context)
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this.context = context;
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public bool Has (IVariable item1)
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return UsedVariables.Contains (item1);
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public void SetAnalyzedRange(AstNode start, AstNode end, bool startInclusive = true, bool endInclusive = true)
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throw new ArgumentNullException("start");
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throw new ArgumentNullException("end");
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startLocation = startInclusive ? start.StartLocation : start.EndLocation;
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endLocation = endInclusive ? end.EndLocation : end.StartLocation;
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public override void VisitIdentifierExpression(IdentifierExpression identifierExpression)
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if (startLocation.IsEmpty || startLocation <= identifierExpression.StartLocation && identifierExpression.EndLocation <= endLocation) {
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var result = context.Resolve(identifierExpression);
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var local = result as LocalResolveResult;
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if (local != null && !UsedVariables.Contains(local.Variable)) {
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UsedVariables.Add(local.Variable);
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public override void VisitVariableDeclarationStatement(VariableDeclarationStatement variableDeclarationStatement)
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base.VisitVariableDeclarationStatement(variableDeclarationStatement);
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foreach (var varDecl in variableDeclarationStatement.Variables) {
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if (startLocation.IsEmpty || startLocation <= varDecl.StartLocation && varDecl.EndLocation <= endLocation) {
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var result = context.Resolve(varDecl);
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var local = result as LocalResolveResult;
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if (local != null && !UsedVariables.Contains(local.Variable))
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UsedVariables.Add(local.Variable);
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public static List<IVariable> Analyze(RefactoringContext context, Expression expression)
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var visitor = new VariableLookupVisitor(context);
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expression.AcceptVisitor(visitor);
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return visitor.UsedVariables;
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public static List<IVariable> Analyze(RefactoringContext context, List<AstNode> statements)
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var visitor = new VariableLookupVisitor(context);
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statements.ForEach(stmt => stmt.AcceptVisitor(visitor));
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return visitor.UsedVariables;