Fix missing parenthesis around ternary expressions (Fixes #116)

src/EntityFrameworkCore.Projectables.Generator/ExpressionSyntaxRewriter.cs

@@ -85,14 +85,14 @@ public ExpressionSyntaxRewriter(INamedTypeSymbol targetTypeSymbol, NullCondition
 
             else if (_nullConditionalRewriteSupport is NullConditionalRewriteSupport.Rewrite)
             {
-                var whenNotNullSymbol = _semanticModel.GetSymbolInfo(node.WhenNotNull).Symbol as IPropertySymbol;
                 var typeInfo = _semanticModel.GetTypeInfo(node);
 
                 // Do not translate until we can resolve the target type
                 if (typeInfo.ConvertedType is not null)
                 {
-                    // Translate null-conditional into a conditional expression
-                    return SyntaxFactory.ConditionalExpression(
+                    // Translate null-conditional into a conditional expression, wrapped inside parenthesis
+                    return SyntaxFactory.ParenthesizedExpression(
+                        SyntaxFactory.ConditionalExpression(
                         SyntaxFactory.BinaryExpression(
                             SyntaxKind.NotEqualsExpression,
                             targetExpression.WithTrailingTrivia(SyntaxFactory.Whitespace(" ")),
@@ -105,7 +105,7 @@ public ExpressionSyntaxRewriter(INamedTypeSymbol targetTypeSymbol, NullCondition
                             SyntaxFactory.ParseName(typeInfo.ConvertedType.ToDisplayString(SymbolDisplayFormat.FullyQualifiedFormat)),
                             SyntaxFactory.LiteralExpression(SyntaxKind.NullLiteralExpression)
                         ).WithLeadingTrivia(SyntaxFactory.Whitespace(" "))
-                    ).WithLeadingTrivia(node.GetLeadingTrivia()).WithTrailingTrivia(node.GetTrailingTrivia());
+                    ).WithLeadingTrivia(node.GetLeadingTrivia()).WithTrailingTrivia(node.GetTrailingTrivia()));
                 }
             }
 

tests/EntityFrameworkCore.Projectables.Generator.Tests/ProjectionExpressionGeneratorTests.BooleanSimpleTernary_WithRewriteSupport_IsBeingRewritten.verified.txt

@@ -0,0 +1,18 @@
+// <auto-generated/>
+#nullable disable
+using System;
+using System.Linq;
+using EntityFrameworkCore.Projectables;
+using Foo;
+
+namespace EntityFrameworkCore.Projectables.Generated
+{
+    [global::System.ComponentModel.EditorBrowsable(global::System.ComponentModel.EditorBrowsableState.Never)]
+    static class Foo_C_Test
+    {
+        static global::System.Linq.Expressions.Expression<global::System.Func<object, bool>> Expression()
+        {
+            return (object x) => (x != null ? (x.Equals(4)) : ( bool ? )null) == false;
+        }
+    }
+}

tests/EntityFrameworkCore.Projectables.Generator.Tests/ProjectionExpressionGeneratorTests.NullConditionalNullCoalesceTypeConversion.verified.txt

@@ -9,7 +9,7 @@ namespace EntityFrameworkCore.Projectables.Generated
     {
         static global::System.Linq.Expressions.Expression<global::System.Func<global::Foo, int>> Expression()
         {
-            return (global::Foo fancyClass) => fancyClass != null ? (fancyClass.FancyNumber) : ( int ? )null ?? 3;
+            return (global::Foo fancyClass) => (fancyClass != null ? (fancyClass.FancyNumber) : ( int ? )null) ?? 3;
         }
     }
 }

tests/EntityFrameworkCore.Projectables.Generator.Tests/ProjectionExpressionGeneratorTests.NullableElementAndMemberBinding_WithRewriteSupport_IsBeingRewritten.verified.txt

@@ -13,7 +13,7 @@ namespace EntityFrameworkCore.Projectables.Generated
     {
         static global::System.Linq.Expressions.Expression<global::System.Func<global::Foo.EntityExtensions.Entity, global::Foo.EntityExtensions.Entity>> Expression()
         {
-            return (global::Foo.EntityExtensions.Entity entity) => entity != null ? (entity.RelatedEntities != null ? (entity.RelatedEntities[0]) : (global::Foo.EntityExtensions.Entity)null) : (global::Foo.EntityExtensions.Entity)null;
+            return (global::Foo.EntityExtensions.Entity entity) => (entity != null ? ((entity.RelatedEntities != null ? (entity.RelatedEntities[0]) : (global::Foo.EntityExtensions.Entity)null)) : (global::Foo.EntityExtensions.Entity)null);
         }
     }
 }

tests/EntityFrameworkCore.Projectables.Generator.Tests/ProjectionExpressionGeneratorTests.NullableElementBinding_WithRewriteSupport_IsBeingRewritten.verified.txt

@@ -12,7 +12,7 @@ namespace EntityFrameworkCore.Projectables.Generated
     {
         static global::System.Linq.Expressions.Expression<global::System.Func<string, string>> Expression()
         {
-            return (string input) => input != null ? (input[0].ToString()) : ( string )null;
+            return (string input) => (input != null ? (input[0].ToString()) : ( string )null);
         }
     }
 }

tests/EntityFrameworkCore.Projectables.Generator.Tests/ProjectionExpressionGeneratorTests.NullableMemberBinding_WithRewriteSupport_IsBeingRewritten.verified.txt

@@ -12,7 +12,7 @@ namespace EntityFrameworkCore.Projectables.Generated
     {
         static global::System.Linq.Expressions.Expression<global::System.Func<string, int?>> Expression()
         {
-            return (string input) => input != null ? (input.Length) : ( int ? )null;
+            return (string input) => (input != null ? (input.Length) : ( int ? )null);
         }
     }
 }

tests/EntityFrameworkCore.Projectables.Generator.Tests/ProjectionExpressionGeneratorTests.NullableParameters_WithRewriteSupport_IsBeingRewritten.verified.txt

@@ -13,7 +13,7 @@ namespace EntityFrameworkCore.Projectables.Generated
     {
         static global::System.Linq.Expressions.Expression<global::System.Func<global::Foo.EntityExtensions.Entity, string>> Expression()
         {
-            return (global::Foo.EntityExtensions.Entity entity) => entity.FullName != null ? (entity.FullName.Substring(entity.FullName != null ? (entity.FullName.IndexOf(' ')) : ( int ? )null ?? 0)) : ( string )null;
+            return (global::Foo.EntityExtensions.Entity entity) => (entity.FullName != null ? (entity.FullName.Substring((entity.FullName != null ? (entity.FullName.IndexOf(' ')) : ( int ? )null) ?? 0)) : ( string )null);
         }
     }
 }

tests/EntityFrameworkCore.Projectables.Generator.Tests/ProjectionExpressionGeneratorTests.NullableSimpleElementBinding_WithRewriteSupport_IsBeingRewritten.verified.txt

@@ -12,7 +12,7 @@ namespace EntityFrameworkCore.Projectables.Generated
     {
         static global::System.Linq.Expressions.Expression<global::System.Func<string, char?>> Expression()
         {
-            return (string input) => input != null ? (input[0]) : ( char ? )null;
+            return (string input) => (input != null ? (input[0]) : ( char ? )null);
         }
     }
 }

tests/EntityFrameworkCore.Projectables.Generator.Tests/ProjectionExpressionGeneratorTests.cs

@@ -803,6 +803,31 @@ static class C {
             return Verifier.Verify(result.GeneratedTrees[0].ToString());
         }
 
+        [Fact]
+        public Task BooleanSimpleTernary_WithRewriteSupport_IsBeingRewritten()
+        {
+            var compilation = CreateCompilation(@"
+using System;
+using System.Linq;
+using EntityFrameworkCore.Projectables;
+
+namespace Foo {
+    static class C {
+        [Projectable(NullConditionalRewriteSupport = NullConditionalRewriteSupport.Rewrite)]
+        public static bool Test(this object? x) => x?.Equals(4) == false;
+    }
+}
+");
+
+            var result = RunGenerator(compilation);
+
+            Assert.Empty(result.Diagnostics);
+            Assert.Single(result.GeneratedTrees);
+
+            return Verifier.Verify(result.GeneratedTrees[0].ToString());
+        }
+
+
 
         [Fact]
         public Task NullableElementBinding_WithIgnoreSupport_IsBeingRewritten()