[CodeIssue] Added RedundantCaseLabelIssue

ICSharpCode.NRefactory.CSharp/ICSharpCode.NRefactory.CSharp.csproj

@@ -302,6 +302,7 @@
     <Compile Include="Refactoring\CodeIssues\RedundantArrayInitializerCommaIssue.cs" />
     <Compile Include="Refactoring\CodeIssues\RedundantAssignmentIssue.cs" />
     <Compile Include="Refactoring\CodeIssues\RedundantAttributeParenthesesIssue.cs" />
+    <Compile Include="Refactoring\CodeIssues\RedundantCaseLabelIssue.cs" />
     <Compile Include="Refactoring\CodeIssues\RedundantElseIssue.cs" />
     <Compile Include="Refactoring\CodeIssues\RedundantFieldInitializerIssue.cs" />
     <Compile Include="Refactoring\CodeIssues\RedundantTypeCastIssue.cs" />

ICSharpCode.NRefactory.CSharp/Refactoring/CodeIssues/RedundantCaseLabelIssue.cs

@@ -0,0 +1,71 @@
+// 
+// RedundantCaseLabelIssue.cs
+// 
+// Author:
+//      Mansheng Yang <lightyang0@gmail.com>
+// 
+// Copyright (c) 2012 Mansheng Yang <lightyang0@gmail.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.Collections.Generic;
+using System.Linq;
+
+namespace ICSharpCode.NRefactory.CSharp.Refactoring
+{
+	[IssueDescription ("Redundant 'case' label",
+						Description = "Redundant 'case' label",
+						Category = IssueCategories.Redundancies,
+						Severity = Severity.Warning,
+						IssueMarker = IssueMarker.GrayOut)]
+	public class RedundantCaseLabelIssue : ICodeIssueProvider
+	{
+		public IEnumerable<CodeIssue> GetIssues (BaseRefactoringContext context)
+		{
+			return new GatherVisitor (context).GetIssues ();
+		}
+
+		class GatherVisitor : GatherVisitorBase
+		{
+			public GatherVisitor(BaseRefactoringContext ctx)
+				: base (ctx)
+			{
+			}
+
+			public override void VisitSwitchSection (SwitchSection switchSection)
+			{
+				base.VisitSwitchSection (switchSection);
+
+				if (switchSection.CaseLabels.Count <2)
+					return;
+
+				var lastLabel = switchSection.CaseLabels.LastOrNullObject ();
+				if (!lastLabel.Expression.IsNull)
+					return;
+				AddIssue (switchSection.FirstChild.StartLocation, lastLabel.StartLocation,
+					ctx.TranslateString ("Remove redundant 'case' label"), scipt => {
+						foreach (var label in switchSection.CaseLabels) {
+							if (label != lastLabel)
+								scipt.Remove (label);
+						}
+					});
+			}
+		}
+	}
+}

ICSharpCode.NRefactory.Tests/CSharp/CodeIssues/RedundantCaseLabelIssueTests.cs

@@ -0,0 +1,65 @@
+// 
+// RedundantCaseLabelIssueTests.cs
+// 
+// Author:
+//      Mansheng Yang <lightyang0@gmail.com>
+// 
+// Copyright (c) 2012 Mansheng Yang <lightyang0@gmail.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 ICSharpCode.NRefactory.CSharp.Refactoring;
+using NUnit.Framework;
+
+namespace ICSharpCode.NRefactory.CSharp.CodeIssues
+{
+	[TestFixture]
+	public class RedundantCaseLabelIssueTests : InspectionActionTestBase
+	{
+		[Test]
+		public void Test ()
+		{
+			var input = @"
+class TestClass
+{
+	void TestMethod (int i)
+	{
+		switch (i) {
+			case 1:
+			case 2:
+			default:
+				break;
+		}
+	}
+}";
+			var output = @"
+class TestClass
+{
+	void TestMethod (int i)
+	{
+		switch (i) {
+			default:
+				break;
+		}
+	}
+}";
+			Test<RedundantCaseLabelIssue> (input, 1, output);
+		}
+	}
+}

ICSharpCode.NRefactory.Tests/ICSharpCode.NRefactory.Tests.csproj

@@ -120,6 +120,7 @@
     <Compile Include="CSharp\CodeIssues\RedundantAssignmentIssueTests.cs" />
     <Compile Include="CSharp\CodeIssues\CompareBooleanWithTrueOrFalseIssueTests.cs" />
     <Compile Include="CSharp\CodeIssues\RedundantAttributeParenthesesIssueTests.cs" />
+    <Compile Include="CSharp\CodeIssues\RedundantCaseLabelIssueTests.cs" />
     <Compile Include="CSharp\CodeIssues\RedundantElseIssueTests.cs" />
     <Compile Include="CSharp\CodeIssues\RedundantFieldInitializerIssueTests.cs" />
     <Compile Include="CSharp\CodeIssues\RedundantTypeCastIssueTests.cs" />