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152 lines
5.2 KiB
152 lines
5.2 KiB
// |
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// RedundantUsingInspector.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 using declarations. |
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/// </summary> |
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[IssueDescription("Remove unused usings", |
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Description = "Removes used declarations 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 RedundantUsingIssue : ICodeIssueProvider |
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{ |
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List<string> namespacesToKeep = new List<string>(); |
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/// <summary> |
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/// The list of namespaces that should be kept even if they are not being used. |
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/// Used in SharpDevelop to always keep the "System" namespace around. |
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/// </summary> |
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public IList<string> NamespacesToKeep { |
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get { return namespacesToKeep; } |
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} |
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public IEnumerable<CodeIssue> GetIssues(BaseRefactoringContext context) |
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{ |
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var visitor = new GatherVisitor (context, this); |
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context.RootNode.AcceptVisitor (visitor); |
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visitor.Collect (); |
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return visitor.FoundIssues; |
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} |
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class GatherVisitor : GatherVisitorBase |
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{ |
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readonly RedundantUsingIssue inspector; |
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Dictionary<UsingDeclaration, bool> isInUse = new Dictionary<UsingDeclaration, bool>(); |
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Dictionary<string, UsingDeclaration> namespaceToUsingDecl = new Dictionary<string, UsingDeclaration>(); |
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public GatherVisitor (BaseRefactoringContext ctx, RedundantUsingIssue inspector) : base (ctx) |
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{ |
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this.inspector = inspector; |
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} |
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public void Collect() |
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{ |
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foreach (var u in isInUse.Where (u => !u.Value)) { |
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var decl = u.Key; |
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AddIssue(decl, ctx.TranslateString("Remove redundant usings"), script => { |
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foreach (var u2 in isInUse.Where (a => !a.Value)) { |
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script.Remove (u2.Key); |
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} |
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} |
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); |
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} |
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} |
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public override void VisitUsingDeclaration(UsingDeclaration usingDeclaration) |
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{ |
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base.VisitUsingDeclaration(usingDeclaration); |
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var nrr = ctx.Resolve(usingDeclaration.Import) as NamespaceResolveResult; |
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if (nrr != null) { |
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isInUse[usingDeclaration] = inspector.namespacesToKeep.Contains(nrr.NamespaceName); |
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namespaceToUsingDecl[nrr.NamespaceName] = usingDeclaration; |
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} |
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} |
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public override void VisitNamespaceDeclaration(NamespaceDeclaration namespaceDeclaration) |
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{ |
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var oldNamespaceToUsingDecl = new Dictionary<string, UsingDeclaration>(namespaceToUsingDecl); |
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base.VisitNamespaceDeclaration(namespaceDeclaration); |
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namespaceToUsingDecl = oldNamespaceToUsingDecl; |
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} |
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void UseNamespace(string ns) |
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{ |
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UsingDeclaration decl; |
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if (namespaceToUsingDecl.TryGetValue(ns, out decl)) { |
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isInUse[decl] = true; |
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} |
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} |
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public override void VisitIdentifierExpression(IdentifierExpression identifierExpression) |
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{ |
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base.VisitIdentifierExpression(identifierExpression); |
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var trr = ctx.Resolve(identifierExpression) as TypeResolveResult; |
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if (trr != null) { |
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UseNamespace(trr.Type.Namespace); |
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} |
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} |
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public override void VisitSimpleType(SimpleType simpleType) |
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{ |
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base.VisitSimpleType(simpleType); |
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UseNamespace(ctx.Resolve(simpleType).Type.Namespace); |
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} |
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public override void VisitInvocationExpression (InvocationExpression invocationExpression) |
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{ |
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base.VisitInvocationExpression (invocationExpression); |
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UseExtensionMethod(ctx.Resolve(invocationExpression)); |
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} |
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void UseExtensionMethod(ResolveResult rr) |
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{ |
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var mg = rr as CSharpInvocationResolveResult; |
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if (mg != null && mg.IsExtensionMethodInvocation) { |
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UseNamespace (mg.Member.DeclaringType.Namespace); |
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} |
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} |
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public override void VisitQueryExpression(QueryExpression queryExpression) |
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{ |
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base.VisitQueryExpression(queryExpression); |
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foreach (var clause in queryExpression.Clauses) { |
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UseExtensionMethod(ctx.Resolve(clause)); |
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} |
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} |
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} |
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} |
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}
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