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//
// RedundantNamespaceUsageInspector.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 System.Collections.Generic;
using System.Linq;
using ICSharpCode.NRefactory.Semantics;
using ICSharpCode.NRefactory.TypeSystem;
using ICSharpCode.NRefactory.Refactoring;
namespace ICSharpCode.NRefactory.CSharp.Refactoring
{
/// <summary>
/// Finds redundant namespace usages.
/// </summary>
[IssueDescription("Redundant name qualifier",
Description = "Removes namespace usages that are obsolete.",
Category = IssueCategories.Redundancies,
Severity = Severity.Warning,
IssueMarker = IssueMarker.GrayOut,
ResharperDisableKeyword = "RedundantNameQualifier")]
public class RedundantNameQualifierIssue : ICodeIssueProvider
{
public IEnumerable<CodeIssue> GetIssues(BaseRefactoringContext context)
{
return new GatherVisitor(context, this).GetIssues();
}
class GatherVisitor : GatherVisitorBase<RedundantNameQualifierIssue>
{
public GatherVisitor (BaseRefactoringContext ctx, RedundantNameQualifierIssue qualifierDirectiveEvidentIssueProvider) : base (ctx, qualifierDirectiveEvidentIssueProvider)
{
}
public override void VisitMemberReferenceExpression(MemberReferenceExpression memberReferenceExpression)
{
base.VisitMemberReferenceExpression(memberReferenceExpression);
HandleMemberReference(
memberReferenceExpression, memberReferenceExpression.Target, memberReferenceExpression.MemberNameToken, memberReferenceExpression.TypeArguments, NameLookupMode.Expression,
script => {
script.Replace(memberReferenceExpression, RefactoringAstHelper.RemoveTarget(memberReferenceExpression));
});
}
public override void VisitMemberType(MemberType memberType)
{
base.VisitMemberType(memberType);
HandleMemberReference(
memberType, memberType.Target, memberType.MemberNameToken, memberType.TypeArguments, memberType.GetNameLookupMode(),
script => {
script.Replace(memberType, RefactoringAstHelper.RemoveTarget(memberType));
});
}
void HandleMemberReference(AstNode wholeNode, AstNode targetNode, Identifier memberName, IEnumerable<AstType> typeArguments, NameLookupMode mode, Action<Script> action)
{
var result = ctx.Resolve(targetNode);
if (!(result is NamespaceResolveResult)) {
return;
}
var wholeResult = ctx.Resolve(wholeNode);
if (!(wholeResult is TypeResolveResult)) {
return;
}
var state = ctx.GetResolverStateBefore(wholeNode);
var resolvedTypeArguments = typeArguments.Select(ctx.ResolveType).ToList();
var lookupName = state.LookupSimpleNameOrTypeName(memberName.Name, resolvedTypeArguments, mode);
if (lookupName is TypeResolveResult && !lookupName.IsError && wholeResult.Type.Equals(lookupName.Type)) {
AddIssue(wholeNode.StartLocation, memberName.StartLocation, ctx.TranslateString("Remove redundant qualifier"), action);
}
}
}
}
}
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