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