Merge pull request #3507 from bjornhellander/feature/listpattern

Update SA1010 to not trigger on list patterns

Author: sharwell

StyleCop.Analyzers/StyleCop.Analyzers.Test.CSharp11/SpacingRules/SA1010CSharp11UnitTests.cs

@@ -3,9 +3,48 @@
 
 namespace StyleCop.Analyzers.Test.CSharp11.SpacingRules
 {
+    using System.Threading;
+    using System.Threading.Tasks;
     using StyleCop.Analyzers.Test.CSharp10.SpacingRules;
+    using StyleCop.Analyzers.Test.Verifiers;
+    using Xunit;
+
+    using static StyleCop.Analyzers.Test.Verifiers.StyleCopCodeFixVerifier<
+        StyleCop.Analyzers.SpacingRules.SA1010OpeningSquareBracketsMustBeSpacedCorrectly,
+        StyleCop.Analyzers.SpacingRules.TokenSpacingCodeFixProvider>;
 
     public class SA1010CSharp11UnitTests : SA1010CSharp10UnitTests
     {
+        [Theory]
+        [InlineData("x is [1]")]
+        [InlineData("x is not [1]")]
+        [InlineData("x is ([1] or [2])")]
+        [InlineData("x is ([1] or not [2])")]
+        [InlineData("x is ([1] and [1])")]
+        [InlineData("x is ([1] and not [2])")]
+        [WorkItem(3503, "https://github.com/DotNetAnalyzers/StyleCopAnalyzers/issues/3503")]
+        public async Task TestListPatternAsync(string condition)
+        {
+            var testCode = $@"
+using System.Collections.Generic;
+
+namespace TestNamespace
+{{
+    public class TestClass
+    {{
+        public void TestMethod(List<int> x)
+        {{
+            _ = {condition};
+        }}
+    }}
+}}
+";
+
+            await new CSharpTest()
+            {
+                ReferenceAssemblies = GenericAnalyzerTest.ReferenceAssembliesNet50,
+                TestCode = testCode,
+            }.RunAsync(CancellationToken.None).ConfigureAwait(false);
+        }
     }
 }

StyleCop.Analyzers/StyleCop.Analyzers/SpacingRules/SA1010OpeningSquareBracketsMustBeSpacedCorrectly.cs

@@ -11,6 +11,7 @@ namespace StyleCop.Analyzers.SpacingRules
     using Microsoft.CodeAnalysis.CSharp;
     using Microsoft.CodeAnalysis.Diagnostics;
     using StyleCop.Analyzers.Helpers;
+    using StyleCop.Analyzers.Lightup;
 
     /// <summary>
     /// An opening square bracket within a C# statement is not spaced correctly.
@@ -98,15 +99,16 @@ private static void HandleOpenBracketToken(SyntaxTreeAnalysisContext context, Sy
                 }
             }
 
-            bool followedBySpace = token.IsFollowedByWhitespace();
-            bool lastInLine = token.IsLastInLine();
-
-            if (!firstInLine && precededBySpace && !ignorePrecedingSpaceProblem && !IsPartOfIndexInitializer(token))
+            if (!firstInLine && precededBySpace && !ignorePrecedingSpaceProblem &&
+                !IsPartOfIndexInitializer(token) && !IsPartOfListPattern(token))
             {
                 // Opening square bracket should {not be preceded} by a space.
                 context.ReportDiagnostic(Diagnostic.Create(DescriptorNotPreceded, token.GetLocation(), TokenSpacingProperties.RemovePreceding));
             }
 
+            bool followedBySpace = token.IsFollowedByWhitespace();
+            bool lastInLine = token.IsLastInLine();
+
             if (!lastInLine && followedBySpace)
             {
                 // Opening square bracket should {not be followed} by a space.
@@ -121,5 +123,10 @@ private static bool IsPartOfIndexInitializer(SyntaxToken token)
             return token.Parent.IsKind(SyntaxKind.BracketedArgumentList)
                 && token.Parent.Parent.IsKind(SyntaxKind.ImplicitElementAccess);
         }
+
+        private static bool IsPartOfListPattern(SyntaxToken token)
+        {
+            return token.Parent.IsKind(SyntaxKindEx.ListPattern);
+        }
     }
 }