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//
// RedundantUsingInspector.cs
//
// Author:
// Mike Krüger <mkrueger@xamarin.com>
//
// Copyright (c) 2012 Xamarin <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 ICSharpCode.NRefactory.PatternMatching;
using System.Collections.Generic;
using ICSharpCode.NRefactory.TypeSystem;
using ICSharpCode.NRefactory.Semantics;
using ICSharpCode.NRefactory.CSharp.Resolver;
using System.Linq;
using ICSharpCode.NRefactory.Refactoring;
namespace ICSharpCode.NRefactory.CSharp.Refactoring
{
/// <summary>
/// Finds redundant using declarations.
/// </summary>
[IssueDescription("Redundant using directive",
Description = "Using directive is not required and can safely be removed.",
Category = IssueCategories.Redundancies,
Severity = Severity.Hint,
IssueMarker = IssueMarker.GrayOut,
ResharperDisableKeyword = "RedundantUsingDirective"
)]
public class RedundantUsingDirectiveIssue : ICodeIssueProvider
{
List<string> namespacesToKeep = new List<string>();
/// <summary>
/// The list of namespaces that should be kept even if they are not being used.
/// Used in SharpDevelop to always keep the "System" namespace around.
/// </summary>
public IList<string> NamespacesToKeep {
get { return namespacesToKeep; }
}
public IEnumerable<CodeIssue> GetIssues(BaseRefactoringContext context)
{
var visitor = new GatherVisitor (context, this);
context.RootNode.AcceptVisitor (visitor);
visitor.Collect ();
return visitor.FoundIssues;
}
class GatherVisitor : GatherVisitorBase<RedundantUsingDirectiveIssue>
{
Dictionary<UsingDeclaration, bool> isInUse = new Dictionary<UsingDeclaration, bool>();
Dictionary<string, UsingDeclaration> namespaceToUsingDecl = new Dictionary<string, UsingDeclaration>();
public GatherVisitor (BaseRefactoringContext ctx, RedundantUsingDirectiveIssue qualifierDirectiveEvidentIssueProvider) : base (ctx, qualifierDirectiveEvidentIssueProvider)
{
}
public void Collect()
{
foreach (var u in isInUse.Where (u => !u.Value)) {
var decl = u.Key;
AddIssue(decl, ctx.TranslateString("Remove redundant using directives"), script => {
foreach (var u2 in isInUse.Where (a => !a.Value)) {
script.Remove (u2.Key);
}
}
);
}
}
public override void VisitUsingDeclaration(UsingDeclaration usingDeclaration)
{
base.VisitUsingDeclaration(usingDeclaration);
if (IsSuppressed(usingDeclaration.StartLocation))
return;
var nrr = ctx.Resolve(usingDeclaration.Import) as NamespaceResolveResult;
if (nrr != null) {
isInUse[usingDeclaration] = QualifierDirectiveEvidentIssueProvider.namespacesToKeep.Contains(nrr.NamespaceName);
namespaceToUsingDecl[nrr.NamespaceName] = usingDeclaration;
}
}
public override void VisitNamespaceDeclaration(NamespaceDeclaration namespaceDeclaration)
{
var oldNamespaceToUsingDecl = new Dictionary<string, UsingDeclaration>(namespaceToUsingDecl);
base.VisitNamespaceDeclaration(namespaceDeclaration);
namespaceToUsingDecl = oldNamespaceToUsingDecl;
}
void UseNamespace(string ns)
{
UsingDeclaration decl;
if (namespaceToUsingDecl.TryGetValue(ns, out decl)) {
isInUse[decl] = true;
}
}
public override void VisitIdentifierExpression(IdentifierExpression identifierExpression)
{
base.VisitIdentifierExpression(identifierExpression);
var trr = ctx.Resolve(identifierExpression) as TypeResolveResult;
if (trr != null) {
UseNamespace(trr.Type.Namespace);
}
}
public override void VisitSimpleType(SimpleType simpleType)
{
base.VisitSimpleType(simpleType);
UseNamespace(ctx.Resolve(simpleType).Type.Namespace);
}
public override void VisitInvocationExpression (InvocationExpression invocationExpression)
{
base.VisitInvocationExpression (invocationExpression);
UseExtensionMethod(ctx.Resolve(invocationExpression));
}
void UseExtensionMethod(ResolveResult rr)
{
var mg = rr as CSharpInvocationResolveResult;
if (mg != null && mg.IsExtensionMethodInvocation) {
UseNamespace (mg.Member.DeclaringType.Namespace);
}
}
public override void VisitQueryExpression(QueryExpression queryExpression)
{
base.VisitQueryExpression(queryExpression);
foreach (var clause in queryExpression.Clauses) {
UseExtensionMethod(ctx.Resolve(clause));
}
}
}
}
}
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