Merge pull request #3409 from bjornhellander/feature/Issue3386CastInRange

Update SA1003 and SA1008 to not require space before a cast inside a range expression

Author: sharwell

StyleCop.Analyzers/StyleCop.Analyzers.Test.CSharp8/SpacingRules/SA1003CSharp8UnitTests.cs

@@ -3,9 +3,67 @@
 
 namespace StyleCop.Analyzers.Test.CSharp8.SpacingRules
 {
+    using System.Threading;
+    using System.Threading.Tasks;
+    using Microsoft.CodeAnalysis.CSharp;
+    using Microsoft.CodeAnalysis.Testing;
     using StyleCop.Analyzers.Test.CSharp7.SpacingRules;
+    using Xunit;
+
+    using static StyleCop.Analyzers.SpacingRules.SA1003SymbolsMustBeSpacedCorrectly;
+    using static StyleCop.Analyzers.Test.Verifiers.StyleCopCodeFixVerifier<
+        StyleCop.Analyzers.SpacingRules.SA1003SymbolsMustBeSpacedCorrectly,
+        StyleCop.Analyzers.SpacingRules.SA1003CodeFixProvider>;
 
     public class SA1003CSharp8UnitTests : SA1003CSharp7UnitTests
     {
+        /// <summary>
+        /// Verifies that spacing around a range expression double dots isn't required.
+        /// </summary>
+        /// <remarks>
+        /// <para>Double dots of range expressions already provide enough spacing for readability so there is no
+        /// need to surround the range expression with spaces.</para>
+        /// </remarks>
+        /// <returns>A <see cref="Task"/> representing the asynchronous unit test.</returns>
+        [Fact]
+        [WorkItem(3386, "https://github.com/DotNetAnalyzers/StyleCopAnalyzers/issues/3386")]
+        public async Task TestRangeExpressionAsync()
+        {
+            var testCode = @"
+namespace TestNamespace
+{
+    using System;
+    public class TestClass
+    {
+        public void TestMethod()
+        {
+            var test1 = .. {|#0:(|}int)1;
+        }
+    }
+}
+";
+
+            var fixedCode = @"
+namespace TestNamespace
+{
+    using System;
+    public class TestClass
+    {
+        public void TestMethod()
+        {
+            var test1 = ..(int)1;
+        }
+    }
+}
+";
+
+            await new CSharpTest(LanguageVersion.CSharp8)
+            {
+                ReferenceAssemblies = ReferenceAssemblies.NetCore.NetCoreApp31,
+                TestCode = testCode,
+                ExpectedDiagnostics = { Diagnostic(DescriptorNotPrecededByWhitespace).WithLocation(0).WithArguments("(int)") },
+                FixedCode = fixedCode,
+            }.RunAsync(CancellationToken.None).ConfigureAwait(false);
+        }
     }
 }

StyleCop.Analyzers/StyleCop.Analyzers.Test.CSharp8/SpacingRules/SA1008CSharp8UnitTests.cs

@@ -8,7 +8,6 @@ namespace StyleCop.Analyzers.Test.CSharp8.SpacingRules
     using Microsoft.CodeAnalysis.CSharp;
     using Microsoft.CodeAnalysis.Testing;
     using StyleCop.Analyzers.Test.CSharp7.SpacingRules;
-    using StyleCop.Analyzers.Test.Verifiers;
     using Xunit;
 
     using static StyleCop.Analyzers.SpacingRules.SA1008OpeningParenthesisMustBeSpacedCorrectly;
@@ -28,6 +27,7 @@ public class SA1008CSharp8UnitTests : SA1008CSharp7UnitTests
         /// </remarks>
         /// <returns>A <see cref="Task"/> representing the asynchronous unit test.</returns>
         [Fact]
+        [WorkItem(3386, "https://github.com/DotNetAnalyzers/StyleCopAnalyzers/issues/3386")]
         public async Task TestAfterRangeExpressionAsync()
         {
             var testCode = @"
@@ -36,11 +36,12 @@ namespace TestNamespace
     using System;
     public class TestClass
     {
-        public string TestMethod()
+        public void TestMethod()
         {
             string str = ""test"";
             int finalLen = 4;
-            return str[.. {|#0:(|}finalLen - 1)];
+            var test1 = str[.. {|#0:(|}finalLen - 1)];
+            var test2 = .. {|#1:(|}int)finalLen;
         }
     }
 }
@@ -52,11 +53,12 @@ namespace TestNamespace
     using System;
     public class TestClass
     {
-        public string TestMethod()
+        public void TestMethod()
         {
             string str = ""test"";
             int finalLen = 4;
-            return str[..(finalLen - 1)];
+            var test1 = str[..(finalLen - 1)];
+            var test2 = ..(int)finalLen;
         }
     }
 }
@@ -66,7 +68,11 @@ public string TestMethod()
             {
                 ReferenceAssemblies = ReferenceAssemblies.NetCore.NetCoreApp31,
                 TestCode = testCode,
-                ExpectedDiagnostics = { Diagnostic(DescriptorNotPreceded).WithLocation(0) },
+                ExpectedDiagnostics =
+                {
+                    Diagnostic(DescriptorNotPreceded).WithLocation(0),
+                    Diagnostic(DescriptorNotPreceded).WithLocation(1),
+                },
                 FixedCode = fixedCode,
             }.RunAsync(CancellationToken.None).ConfigureAwait(false);
         }

StyleCop.Analyzers/StyleCop.Analyzers/SpacingRules/SA1003SymbolsMustBeSpacedCorrectly.cs

@@ -10,6 +10,7 @@ namespace StyleCop.Analyzers.SpacingRules
     using Microsoft.CodeAnalysis.CSharp.Syntax;
     using Microsoft.CodeAnalysis.Diagnostics;
     using StyleCop.Analyzers.Helpers;
+    using StyleCop.Analyzers.Lightup;
 
     /// <summary>
     /// The spacing around an operator symbol is incorrect, within a C# code file.
@@ -344,7 +345,8 @@ private static void HandleCastExpression(SyntaxNodeAnalysisContext context)
                 && !(castExpression.Parent is CastExpressionSyntax)
                 && !precedingToken.IsKind(SyntaxKind.OpenParenToken)
                 && !precedingToken.IsKind(SyntaxKind.OpenBracketToken)
-                && !(precedingToken.IsKind(SyntaxKind.OpenBraceToken) && (precedingToken.Parent is InterpolationSyntax));
+                && !(precedingToken.IsKind(SyntaxKind.OpenBraceToken) && (precedingToken.Parent is InterpolationSyntax))
+                && !precedingToken.IsKind(SyntaxKindEx.DotDotToken);
 
             var tokenString = castExpression.OpenParenToken.ToString() + castExpression.Type.ToString() + castExpression.CloseParenToken.ToString();
             CheckToken(context, castExpression.OpenParenToken, mustHaveLeadingWhitespace, false, false, tokenString);

StyleCop.Analyzers/StyleCop.Analyzers/SpacingRules/SA1008OpeningParenthesisMustBeSpacedCorrectly.cs

@@ -231,8 +231,9 @@ private static void HandleOpenParenToken(SyntaxTreeAnalysisContext context, Synt
                 startOfIndexer = prevToken.IsKind(SyntaxKind.OpenBracketToken);
                 var consecutiveCast = prevToken.IsKind(SyntaxKind.CloseParenToken) && prevToken.Parent.IsKind(SyntaxKind.CastExpression);
                 var partOfInterpolation = prevToken.IsKind(SyntaxKind.OpenBraceToken) && prevToken.Parent.IsKind(SyntaxKind.Interpolation);
+                var partOfRange = prevToken.IsKind(SyntaxKindEx.DotDotToken);
 
-                haveLeadingSpace = !partOfUnaryExpression && !startOfIndexer && !consecutiveCast && !partOfInterpolation;
+                haveLeadingSpace = !partOfUnaryExpression && !startOfIndexer && !consecutiveCast && !partOfInterpolation && !partOfRange;
                 break;
 
             case SyntaxKind.ParameterList: