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Viewing changes to contrib/ICSharpCode.NRefactory.CSharp/Refactoring/CodeIssues/RedundantThisIssue.cs

  • Committer: Package Import Robot
  • Author(s): Jo Shields
  • Date: 2013-05-12 09:46:03 UTC
  • mto: This revision was merged to the branch mainline in revision 29.
  • Revision ID: package-import@ubuntu.com-20130512094603-mad323bzcxvmcam0
Tags: upstream-4.0.5+dfsg
Import upstream version 4.0.5+dfsg

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contrib/ICSharpCode.NRefactory.CSharp/Refactoring/CodeIssues/RedundantThisIssue.cs
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// 
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// RedundantThisInspector.cs
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//  
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// Author:
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//       Mike Krüger <mkrueger@xamarin.com>
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// 
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// Copyright (c) 2012 Xamarin <http://xamarin.com>
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// 
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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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// 
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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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// 
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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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// THE SOFTWARE.
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using System;
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using ICSharpCode.NRefactory.PatternMatching;
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using System.Collections.Generic;
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using ICSharpCode.NRefactory.TypeSystem;
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using ICSharpCode.NRefactory.Semantics;
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using ICSharpCode.NRefactory.CSharp.Resolver;
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using System.Linq;
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namespace ICSharpCode.NRefactory.CSharp.Refactoring
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{
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        /// <summary>
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        /// Finds redundant namespace usages.
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        /// </summary>
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        [IssueDescription("Remove redundant 'this.'",
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               Description= "Removes 'this.' references that are not required.",
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               Category = IssueCategories.Redundancies,
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               Severity = Severity.Hint,
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               IssueMarker = IssueMarker.GrayOut)]
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        public class RedundantThisIssue : ICodeIssueProvider
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        {
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                public IEnumerable<CodeIssue> GetIssues(BaseRefactoringContext context)
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                {
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                        return new GatherVisitor(context, this).GetIssues();
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                }
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                class GatherVisitor : GatherVisitorBase
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                {
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                        readonly RedundantThisIssue inspector;
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                        public GatherVisitor (BaseRefactoringContext ctx, RedundantThisIssue inspector) : base (ctx)
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                        {
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                                this.inspector = inspector;
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                        }
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                        static IMember GetMember (ResolveResult result)
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                        {
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                                if (result is MemberResolveResult) {
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                                        return ((MemberResolveResult)result).Member;
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                                } else if (result is MethodGroupResolveResult) {
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                                        return ((MethodGroupResolveResult)result).Methods.FirstOrDefault ();
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                                }
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                                return null;
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                        }
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                        public override void VisitThisReferenceExpression(ThisReferenceExpression thisReferenceExpression)
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                        {
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                                base.VisitThisReferenceExpression(thisReferenceExpression);
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                                var memberReference = thisReferenceExpression.Parent as MemberReferenceExpression;
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                                if (memberReference == null) {
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                                        return;
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                                }
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                                var state = ctx.GetResolverStateAfter(thisReferenceExpression);
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                                var wholeResult = ctx.Resolve(memberReference);
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                                IMember member = GetMember(wholeResult);
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                                if (member == null) { 
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                                        return;
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                                }
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                                var result = state.LookupSimpleNameOrTypeName(memberReference.MemberName, EmptyList<IType>.Instance, NameLookupMode.Expression);
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                                bool isRedundant;
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                                if (result is MemberResolveResult) {
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                                        isRedundant = ((MemberResolveResult)result).Member.Region.Equals(member.Region);
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                                } else if (result is MethodGroupResolveResult) {
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                                        isRedundant = ((MethodGroupResolveResult)result).Methods.Any(m => m.Region.Equals(member.Region));
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                                } else {
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                                        return;
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                                }
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                                if (isRedundant) {
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                                        AddIssue(thisReferenceExpression.StartLocation, memberReference.MemberNameToken.StartLocation, ctx.TranslateString("Remove redundant 'this.'"), script => {
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                                                script.Replace(memberReference, RefactoringAstHelper.RemoveTarget(memberReference));
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                                        }
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                                        );
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                                }
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                        }
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                }
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        }
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}
 
 
b'\\ No newline at end of file'