Update SA1008 to require a space before the opening parenthesis if it's the left operand of a range expression. Also add test for SA1008 in collection expression.

#3894

Author: bjornhellander

StyleCop.Analyzers/StyleCop.Analyzers.Test.CSharp12/SpacingRules/SA1008CSharp12UnitTests.cs

@@ -5,6 +5,7 @@ namespace StyleCop.Analyzers.Test.CSharp12.SpacingRules
 {
     using System.Threading;
     using System.Threading.Tasks;
+    using Microsoft.CodeAnalysis.Testing;
     using StyleCop.Analyzers.Test.CSharp11.SpacingRules;
     using Xunit;
 
@@ -28,5 +29,48 @@ public async Task TestTupleUsingAliasAsync()
             var expected = Diagnostic(DescriptorPreceded).WithLocation(0);
             await VerifyCSharpFixAsync(testCode, expected, fixedCode, CancellationToken.None).ConfigureAwait(false);
         }
+
+        [Fact]
+        [WorkItem(3894, "https://github.com/DotNetAnalyzers/StyleCopAnalyzers/issues/3894")]
+        public async Task TestCollectionExpressionAsync()
+        {
+            var testCode = @"
+namespace TestNamespace
+{
+    public class TestClass
+    {
+        public void TestMethod()
+        {
+            int[] x = [ {|#0:(|} 0 + 0)];
+        }
+    }
+}
+";
+
+            var fixedCode = @"
+namespace TestNamespace
+{
+    public class TestClass
+    {
+        public void TestMethod()
+        {
+            int[] x = [(0 + 0)];
+        }
+    }
+}
+";
+
+            DiagnosticResult[] expectedResults =
+            {
+                Diagnostic(DescriptorNotPreceded).WithLocation(0),
+                Diagnostic(DescriptorNotFollowed).WithLocation(0),
+            };
+
+            await VerifyCSharpFixAsync(
+                testCode,
+                expectedResults,
+                fixedCode,
+                CancellationToken.None).ConfigureAwait(false);
+        }
     }
 }

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

@@ -194,5 +194,48 @@ await VerifyCSharpFixAsync(
                 fixedCode,
                 CancellationToken.None).ConfigureAwait(false);
         }
+
+        [Fact]
+        [WorkItem(3894, "https://github.com/DotNetAnalyzers/StyleCopAnalyzers/issues/3894")]
+        public async Task TestLeftOperandInRangeExpressionAsync()
+        {
+            var testCode = @"
+namespace TestNamespace
+{
+    public class TestClass
+    {
+        public void TestMethod()
+        {
+            var x ={|#0:(|} 0 + 0)..1;
+        }
+    }
+}
+";
+
+            var fixedCode = @"
+namespace TestNamespace
+{
+    public class TestClass
+    {
+        public void TestMethod()
+        {
+            var x = (0 + 0)..1;
+        }
+    }
+}
+";
+
+            DiagnosticResult[] expectedResults =
+            {
+                Diagnostic(DescriptorPreceded).WithLocation(0),
+                Diagnostic(DescriptorNotFollowed).WithLocation(0),
+            };
+
+            await VerifyCSharpFixAsync(
+                testCode,
+                expectedResults,
+                fixedCode,
+                CancellationToken.None).ConfigureAwait(false);
+        }
     }
 }

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

@@ -223,7 +223,7 @@ private static void HandleOpenParenToken(SyntaxTreeAnalysisContext context, Synt
             case SyntaxKind.ParenthesizedExpression:
             case SyntaxKindEx.TupleExpression:
                 if (prevToken.Parent.IsKind(SyntaxKind.Interpolation)
-                    || token.Parent.Parent.IsKind(SyntaxKindEx.RangeExpression))
+                    || (token.Parent.Parent.IsKind(SyntaxKindEx.RangeExpression) && ((RangeExpressionSyntaxWrapper)token.Parent.Parent).RightOperand == token.Parent))
                 {
                     haveLeadingSpace = false;
                     break;