SA1107: Dont report if the previous statement is missing its last token

Author: pdelvo

StyleCop.Analyzers/StyleCop.Analyzers.Test/ReadabilityRules/SA1107UnitTests.cs

@@ -6,6 +6,7 @@ namespace StyleCop.Analyzers.Test.ReadabilityRules
     using System.Collections.Generic;
     using System.Threading;
     using System.Threading.Tasks;
+    using Microsoft.CodeAnalysis;
     using Microsoft.CodeAnalysis.CodeFixes;
     using Microsoft.CodeAnalysis.Diagnostics;
     using StyleCop.Analyzers.ReadabilityRules;
@@ -122,6 +123,35 @@ public static void Foo(string a, string b)
             await this.VerifyCSharpDiagnosticAsync(testCode, EmptyDiagnosticResults, CancellationToken.None).ConfigureAwait(false);
         }
 
+        [Fact]
+        public async Task TestThatAnalyzerIgnoresStatementsWithMissingTokenAsync()
+        {
+            string testCode = @"
+using System;
+class ClassName
+{
+    public static void Foo(string a, string b)
+    {
+        int i
+        if (true)
+        {
+            Console.WriteLine(""Bar"");
+        }
+    }
+}
+";
+            DiagnosticResult expected = new DiagnosticResult
+            {
+                Id = "CS1002",
+                Message = "; expected",
+                Severity = DiagnosticSeverity.Error,
+            };
+
+            expected = expected.WithLocation(7, 14);
+
+            await this.VerifyCSharpDiagnosticAsync(testCode, expected, CancellationToken.None).ConfigureAwait(false);
+        }
+
         protected override IEnumerable<DiagnosticAnalyzer> GetCSharpDiagnosticAnalyzers()
         {
             yield return new SA1107CodeMustNotContainMultipleStatementsOnOneLine();

StyleCop.Analyzers/StyleCop.Analyzers/ReadabilityRules/SA1107CodeMustNotContainMultipleStatementsOnOneLine.cs

@@ -62,22 +62,31 @@ private static void HandleBlock(SyntaxNodeAnalysisContext context)
 
             if (block != null && block.Statements.Any())
             {
-                FileLinePositionSpan previousStatementLocation = block.Statements[0].GetLineSpan();
+                var previousStatement = block.Statements[0];
+                FileLinePositionSpan previousStatementLocation = previousStatement.GetLineSpan();
                 FileLinePositionSpan currentStatementLocation;
 
                 for (int i = 1; i < block.Statements.Count; i++)
                 {
-                    currentStatementLocation = block.Statements[i].GetLineSpan();
+                    var currentStatement = block.Statements[i];
+                    currentStatementLocation = currentStatement.GetLineSpan();
 
                     if (previousStatementLocation.EndLinePosition.Line
-                        == currentStatementLocation.StartLinePosition.Line)
+                        == currentStatementLocation.StartLinePosition.Line
+                        && !IsLastTokenMissing(previousStatement))
                     {
                         context.ReportDiagnostic(Diagnostic.Create(Descriptor, block.Statements[i].GetLocation()));
                     }
 
                     previousStatementLocation = currentStatementLocation;
+                    previousStatement = currentStatement;
                 }
             }
         }
+
+        private static bool IsLastTokenMissing(StatementSyntax previousStatement)
+        {
+            return previousStatement.GetLastToken(includeZeroWidth: true, includeSkipped: true).IsMissing;
+        }
     }
 }