2 files changed, 61 insertions(+), 0 deletions(-)

A Core/NosSmooth.PacketSerializersGenerator/Extensions/TypeSymbolExtensions.cs
A Core/NosSmooth.PacketSerializersGenerator/Extensions/TypeSyntaxExtensions.cs

@@ 0,0 1,36 @@
+//
+//  TypeSymbolExtensions.cs
+//
+//  Copyright (c) František Boháček. All rights reserved.
+//  Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using Microsoft.CodeAnalysis;
+
+namespace NosSmooth.PacketSerializersGenerator.Extensions;
+
+/// <summary>
+/// Extension methods for <see cref="ITypeSymbol"/>.
+/// </summary>
+public static class TypeSymbolExtensions
+{
+    /// <summary>
+    /// Gets whether the type symbol is nullable.
+    /// </summary>
+    /// <param name="typeSymbol">The type symbol.</param>
+    /// <returns>Whether the type symbol is nullable. Returns null if not possible to determine.</returns>
+    public static bool? IsNullable(this ITypeSymbol typeSymbol)
+    {
+        if (typeSymbol.NullableAnnotation == NullableAnnotation.Annotated || typeSymbol.Name == "Nullable")
+        {
+            return true;
+        }
+
+        if (typeSymbol.IsValueType)
+        {
+            return false;
+        }
+
+        // cannot determine if not nullable from reference type.
+        return null;
+    }
+}<
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@@ 0,0 1,25 @@
+//
+//  TypeSyntaxExtensions.cs
+//
+//  Copyright (c) František Boháček. All rights reserved.
+//  Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using Microsoft.CodeAnalysis.CSharp.Syntax;
+
+namespace NosSmooth.PacketSerializersGenerator.Extensions;
+
+/// <summary>
+/// Extension methods for <see cref="TypeSyntax"/>.
+/// </summary>
+public static class TypeSyntaxExtensions
+{
+    /// <summary>
+    /// Gets whether the type syntax is nullable.
+    /// </summary>
+    /// <param name="typeSyntax">The type syntax.</param>
+    /// <returns>Whether the type syntax is nullable.</returns>
+    public static bool IsNullable(this TypeSyntax typeSyntax)
+    {
+        return typeSyntax is NullableTypeSyntax;
+    }
+}<
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