Fixed a bug in implicit operator generation where referenced type domain primitives were not correctly processed, causing null reference exception. The solution involved checking for null.

Author: GregoryNikolaishvili

Directory.Build.props

@@ -9,7 +9,7 @@
 	<Product>Domain Primitives</Product>
 	<Company>ALTA Software llc.</Company>
 	<Copyright>Copyright © 2024 ALTA Software llc.</Copyright>
-	<Version>2.0.1</Version>
+	<Version>2.0.2</Version>
   </PropertyGroup>
 
   <PropertyGroup>

src/AltaSoft.DomainPrimitives.Generator/Executor.cs

@@ -662,51 +662,73 @@ static StringBuilder AppendInterface(StringBuilder sb, string interfaceName)
     private static void GenerateImplicitOperators(GeneratorData data, SourceCodeBuilder builder)
     {
         var friendlyName = data.PrimitiveTypeFriendlyName;
+        var type = data.PrimitiveTypeSymbol;
+        var className = data.ClassName;
 
+        // From Underlying to our type
         if (data.TypeSymbol.IsValueType)
         {
-            builder.AppendSummary($"Implicit conversion from <see cref = \"{friendlyName}\"/> to <see cref = \"{data.ClassName}\"/>")
+            builder.AppendSummary($"Implicit conversion from <see cref = \"{friendlyName}\"/> to <see cref = \"{className}\"/>")
                 .AppendLine("[MethodImpl(MethodImplOptions.AggressiveInlining)]")
-                .Append($"public static implicit operator {data.ClassName}({friendlyName} value)")
-            .AppendLine(" => new(value);")
+                .Append($"public static implicit operator {className}({friendlyName} value)").AppendLine(" => new(value);")
             .NewLine();
         }
 
-        var type = data.PrimitiveTypeSymbol;
-
-        builder.AppendSummary($"Implicit conversion from <see cref = \"{friendlyName}\"/> (nullable) to <see cref = \"{data.ClassName}\"/> (nullable)")
+        builder.AppendSummary($"Implicit conversion from <see cref = \"{friendlyName}\"/> (nullable) to <see cref = \"{className}\"/> (nullable)")
             .AppendLine("[MethodImpl(MethodImplOptions.AggressiveInlining)]")
             .AppendLine("[return: NotNullIfNotNull(nameof(value))]")
-            .Append($"public static implicit operator {data.ClassName}?({friendlyName}? value)")
+            .Append($"public static implicit operator {className}?({friendlyName}? value)")
             .AppendLine($" => value is null ? null : new(value{(type.IsValueType ? ".Value" : "")});")
             .NewLine();
 
+        // From our type to underlying type
+        if (data.TypeSymbol.IsValueType)
+        {
+            builder.AppendSummary($"Implicit conversion from <see cref = \"{className}\"/> to <see cref = \"{friendlyName}\"/>")
+            .AppendLine("[MethodImpl(MethodImplOptions.AggressiveInlining)]")
+            .Append($"public static implicit operator {friendlyName}({className} value)").AppendLine($" => ({friendlyName})value.{data.FieldName};")
+            .NewLine();
+        }
+
+        builder.AppendSummary($"Implicit conversion from <see cref = \"{className}\"/> (nullable) to <see cref = \"{friendlyName}\"/> (nullable)")
+            .AppendLine("[MethodImpl(MethodImplOptions.AggressiveInlining)]")
+            .AppendLine("[return: NotNullIfNotNull(nameof(value))]")
+            .Append($"public static implicit operator {friendlyName}?({className}? value)")
+            .AppendLine($" => value is null ? null : ({friendlyName}?)value{(type.IsValueType ? ".Value" : "")}.{data.FieldName};")
+            .NewLine();
+
         if (data.ParentSymbols.Count != 0)
         {
-            builder.AppendSummary($"Implicit conversion from <see cref = \"{data.ParentSymbols[0].Name}\"/> to <see cref = \"{data.ClassName}\"/>")
+            var parentClassName = data.ParentSymbols[0].Name;
+
+            if (data.TypeSymbol.IsValueType)
+            {
+                builder.AppendSummary($"Implicit conversion from <see cref = \"{parentClassName}\"/> to <see cref = \"{className}\"/>")
                 .AppendLine("[MethodImpl(MethodImplOptions.AggressiveInlining)]")
-                .Append($"public static implicit operator {data.ClassName}({data.ParentSymbols[0].Name} value)")
+                .Append($"public static implicit operator {className}({parentClassName} value)")
                 .AppendLine(" => new(value);")
                 .NewLine();
-        }
+            }
 
-        builder.AppendSummary($"Implicit conversion from <see cref = \"{data.ClassName}\"/> to <see cref = \"{friendlyName}\"/>")
-            .AppendLine("[MethodImpl(MethodImplOptions.AggressiveInlining)]")
-            .Append($"public static implicit operator {friendlyName}({data.ClassName} value)")
-            .AppendLine($" => ({friendlyName})value.{data.FieldName};")
-            .NewLine();
+            builder.AppendSummary($"Implicit conversion from <see cref = \"{parentClassName}\"/> (nullable) to <see cref = \"{className}\"/> (nullable)")
+                .AppendLine("[MethodImpl(MethodImplOptions.AggressiveInlining)]")
+                .AppendLine("[return: NotNullIfNotNull(nameof(value))]")
+                .Append($"public static implicit operator {className}?({parentClassName}? value)")
+                .AppendLine($" => value is null ? null : ({className}?)value{(type.IsValueType ? ".Value" : "")}.{data.FieldName};")
+                .NewLine();
+        }
 
         if (data.UnderlyingType is DomainPrimitiveUnderlyingType.DateOnly or DomainPrimitiveUnderlyingType.TimeOnly)
         {
-            builder.AppendSummary($"Implicit conversion from <see cref = \"{data.ClassName}\"/> to <see cref = \"DateTime\"/>")
+            builder.AppendSummary($"Implicit conversion from <see cref = \"{className}\"/> to <see cref = \"DateTime\"/>")
                 .AppendLine("[MethodImpl(MethodImplOptions.AggressiveInlining)]")
-                .Append($"public static implicit operator DateTime({data.ClassName} value)")
+                .Append($"public static implicit operator DateTime({className} value)")
                 .AppendLine($" => (({friendlyName})value.{data.FieldName}).ToDateTime();")
                 .NewLine();
 
-            builder.AppendSummary($"Implicit conversion from <see cref = \"DateTime\"/> to <see cref = \"{data.ClassName}\"/>")
+            builder.AppendSummary($"Implicit conversion from <see cref = \"DateTime\"/> to <see cref = \"{className}\"/>")
                 .AppendLine("[MethodImpl(MethodImplOptions.AggressiveInlining)]")
-                .Append($"public static implicit operator {data.ClassName}(DateTime value)")
+                .Append($"public static implicit operator {className}(DateTime value)")
                 .AppendLine($" => {data.UnderlyingType}.FromDateTime(value);")
                 .NewLine();
         }

src/AltaSoft.DomainPrimitives.Generator/Helpers/SourceCodeBuilder.cs

@@ -71,7 +71,9 @@ public SourceCodeBuilder(int startingIndent = 0)
     /// Returns the length of the new line character(s) used in the current environment.
     /// </summary>
     /// <returns>The length of the new line character(s).</returns>
+#pragma warning disable CA1822
     public int GetNewLineLength() => s_newLineLength;
+#pragma warning restore CA1822
 
     /// <summary>
     /// Returns a string that represents the specified number of indentation chars.

src/AltaSoft.DomainPrimitives.XmlDataTypes/AltaSoft.DomainPrimitives.XmlDataTypes.csproj

@@ -623,6 +623,95 @@ public static void Validate(char value)
         return TestHelper.Verify(source, (_, x, _) => Assert.Equal(4, x.Count));
     }
 
+    [Fact]
+    public Task StringOfStringValue_GeneratesAllInterfacesAndConverters()
+    {
+        const string source = """
+                              using System;
+                              using System.Collections.Generic;
+                              using System.Linq;
+                              using System.Text;
+                              using System.Threading.Tasks;
+                              using AltaSoft.DomainPrimitives.Abstractions;
+
+                              namespace AltaSoft.DomainPrimitives;
+
+                              /// <inheritdoc/>
+                              public partial class StringValue : IDomainValue<string>
+                              {
+                              /// <inheritdoc/>
+                              public static void Validate(string value)
+                              {
+                                  if (value=="Test")
+                                      throw new InvalidDomainValueException("Invalid Value");
+                              }
+                              
+                              /// <inheritdoc/>
+                              public static string Default => default;
+                              }
+                              
+                              /// <inheritdoc/>
+                              public partial class StringOfStringValue : IDomainValue<StringValue>
+                              {
+                              /// <inheritdoc/>
+                              public static void Validate(StringValue value)
+                              {
+                                  if (value=="Test")
+                                      throw new InvalidDomainValueException("Invalid Value");
+                              }
+                              
+                              /// <inheritdoc/>
+                              public static StringValue Default => default;
+                              }
+                              """;
+
+        return TestHelper.Verify(source, (_, x, _) => Assert.Equal(7, x.Count));
+    }
+
+    [Fact]
+    public Task IntOfIntValue_GeneratesAllInterfacesAndConverters()
+    {
+        const string source = """
+                              using System;
+                              using System.Collections.Generic;
+                              using System.Linq;
+                              using System.Text;
+                              using System.Threading.Tasks;
+                              using AltaSoft.DomainPrimitives.Abstractions;
+
+                              namespace AltaSoft.DomainPrimitives;
+
+                              /// <inheritdoc/>
+                              public readonly partial struct IntValue : IDomainValue<int>
+                              {
+                              	/// <inheritdoc/>
+                              	public static void Validate(int value)
+                              	{
+                              		if (value < 10 || value > 20)
+                              			throw new InvalidDomainValueException("Invalid Value");
+                              	}
+                              
+                              	/// <inheritdoc/>
+                              	public static int Default => default;
+                              }
+                              
+                              /// <inheritdoc/>
+                              public readonly partial struct IntOfIntValue : IDomainValue<IntValue>
+                              {
+                                 	/// <inheritdoc/>
+                                 	public static void Validate(IntValue value)
+                                 	{
+                                    		if (value < 10 || value > 20)
+                                       			throw new InvalidDomainValueException("Invalid Value");
+                                 	}
+                              
+                                 	/// <inheritdoc/>
+                                 	public static IntValue Default => default;
+                              }
+                              """;
+
+        return TestHelper.Verify(source, (_, x, _) => Assert.Equal(7, x.Count));
+    }
     public static class TestHelper
     {
         internal static Task Verify(string source, Action<ImmutableArray<Diagnostic>, List<string>, GeneratorDriver>? additionalChecks = null, DomainPrimitiveGlobalOptions? options = null)

tests/AltaSoft.DomainPrimitives.Generator.Tests/DomainPrimitiveGeneratorTest.cs

@@ -95,6 +95,13 @@ public int CompareTo(object? obj)
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static implicit operator bool(BoolValue value) => (bool)value._value;
 
+    /// <summary>
+    /// Implicit conversion from <see cref = "BoolValue"/> (nullable) to <see cref = "bool"/> (nullable)
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    [return: NotNullIfNotNull(nameof(value))]
+    public static implicit operator bool?(BoolValue? value) => value is null ? null : (bool?)value.Value._value;
+
     /// <inheritdoc/>
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static BoolValue Parse(string s, IFormatProvider? provider) => bool.Parse(s);

tests/AltaSoft.DomainPrimitives.Generator.Tests/Snapshots/DomainPrimitiveGeneratorTest.BoolValue_GeneratesAllInterfacesAndConverters#BoolValue.g.verified.cs

@@ -99,6 +99,13 @@ public int CompareTo(object? obj)
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static implicit operator byte(ByteValue value) => (byte)value._value;
 
+    /// <summary>
+    /// Implicit conversion from <see cref = "ByteValue"/> (nullable) to <see cref = "byte"/> (nullable)
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    [return: NotNullIfNotNull(nameof(value))]
+    public static implicit operator byte?(ByteValue? value) => value is null ? null : (byte?)value.Value._value;
+
     /// <inheritdoc/>
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static bool operator <(ByteValue left, ByteValue right) => left._value < right._value;

tests/AltaSoft.DomainPrimitives.Generator.Tests/Snapshots/DomainPrimitiveGeneratorTest.ByteValue_GeneratesAllInterfacesAndConverters#ByteValue.g.verified.cs

@@ -99,6 +99,13 @@ public int CompareTo(object? obj)
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static implicit operator char(CharValue value) => (char)value._value;
 
+    /// <summary>
+    /// Implicit conversion from <see cref = "CharValue"/> (nullable) to <see cref = "char"/> (nullable)
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    [return: NotNullIfNotNull(nameof(value))]
+    public static implicit operator char?(CharValue? value) => value is null ? null : (char?)value.Value._value;
+
     /// <inheritdoc/>
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static bool operator <(CharValue left, CharValue right) => left._value < right._value;

tests/AltaSoft.DomainPrimitives.Generator.Tests/Snapshots/DomainPrimitiveGeneratorTest.CharValue_GeneratesAllInterfacesAndConverters#CharValue.g.verified.cs

@@ -101,6 +101,13 @@ public int CompareTo(object? obj)
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static implicit operator DateOnly(DateOnlyValue value) => (DateOnly)value._value;
 
+    /// <summary>
+    /// Implicit conversion from <see cref = "DateOnlyValue"/> (nullable) to <see cref = "DateOnly"/> (nullable)
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    [return: NotNullIfNotNull(nameof(value))]
+    public static implicit operator DateOnly?(DateOnlyValue? value) => value is null ? null : (DateOnly?)value.Value._value;
+
     /// <summary>
     /// Implicit conversion from <see cref = "DateOnlyValue"/> to <see cref = "DateTime"/>
     /// </summary>

tests/AltaSoft.DomainPrimitives.Generator.Tests/Snapshots/DomainPrimitiveGeneratorTest.DateOnlyValue_GeneratesAllInterfacesAndConverters#DateOnlyValue.g.verified.cs

@@ -100,6 +100,13 @@ public int CompareTo(object? obj)
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static implicit operator DateTimeOffset(DateTimeOffsetValue value) => (DateTimeOffset)value._value;
 
+    /// <summary>
+    /// Implicit conversion from <see cref = "DateTimeOffsetValue"/> (nullable) to <see cref = "DateTimeOffset"/> (nullable)
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    [return: NotNullIfNotNull(nameof(value))]
+    public static implicit operator DateTimeOffset?(DateTimeOffsetValue? value) => value is null ? null : (DateTimeOffset?)value.Value._value;
+
     /// <inheritdoc/>
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static bool operator <(DateTimeOffsetValue left, DateTimeOffsetValue right) => left._value < right._value;

tests/AltaSoft.DomainPrimitives.Generator.Tests/Snapshots/DomainPrimitiveGeneratorTest.DateTimeOffsetValue_GeneratesAllInterfacesAndConverters#DateTimeOffsetValue.g.verified.cs

@@ -100,6 +100,13 @@ public int CompareTo(object? obj)
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static implicit operator DateTime(DateTimeValue value) => (DateTime)value._value;
 
+    /// <summary>
+    /// Implicit conversion from <see cref = "DateTimeValue"/> (nullable) to <see cref = "DateTime"/> (nullable)
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    [return: NotNullIfNotNull(nameof(value))]
+    public static implicit operator DateTime?(DateTimeValue? value) => value is null ? null : (DateTime?)value.Value._value;
+
     /// <inheritdoc/>
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static bool operator <(DateTimeValue left, DateTimeValue right) => left._value < right._value;

tests/AltaSoft.DomainPrimitives.Generator.Tests/Snapshots/DomainPrimitiveGeneratorTest.DateTimeValue_GeneratesAllInterfacesAndConverters#DateTimeValue.g.verified.cs

@@ -104,6 +104,13 @@ public int CompareTo(object? obj)
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static implicit operator decimal(DecimalValue value) => (decimal)value._value;
 
+    /// <summary>
+    /// Implicit conversion from <see cref = "DecimalValue"/> (nullable) to <see cref = "decimal"/> (nullable)
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    [return: NotNullIfNotNull(nameof(value))]
+    public static implicit operator decimal?(DecimalValue? value) => value is null ? null : (decimal?)value.Value._value;
+
     /// <inheritdoc/>
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static DecimalValue operator +(DecimalValue left, DecimalValue right) => new(left._value + right._value);

tests/AltaSoft.DomainPrimitives.Generator.Tests/Snapshots/DomainPrimitiveGeneratorTest.DecimalValue_GeneratesAllInterfacesAndConverters#DecimalValue.g.verified.cs

@@ -104,6 +104,13 @@ public int CompareTo(object? obj)
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static implicit operator double(DoubleValue value) => (double)value._value;
 
+    /// <summary>
+    /// Implicit conversion from <see cref = "DoubleValue"/> (nullable) to <see cref = "double"/> (nullable)
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    [return: NotNullIfNotNull(nameof(value))]
+    public static implicit operator double?(DoubleValue? value) => value is null ? null : (double?)value.Value._value;
+
     /// <inheritdoc/>
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static DoubleValue operator +(DoubleValue left, DoubleValue right) => new(left._value + right._value);

tests/AltaSoft.DomainPrimitives.Generator.Tests/Snapshots/DomainPrimitiveGeneratorTest.DoubleValue_GeneratesAllInterfacesAndConverters#DoubleValue.g.verified.cs

@@ -104,6 +104,13 @@ public int CompareTo(object? obj)
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static implicit operator float(FloatValue value) => (float)value._value;
 
+    /// <summary>
+    /// Implicit conversion from <see cref = "FloatValue"/> (nullable) to <see cref = "float"/> (nullable)
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    [return: NotNullIfNotNull(nameof(value))]
+    public static implicit operator float?(FloatValue? value) => value is null ? null : (float?)value.Value._value;
+
     /// <inheritdoc/>
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static FloatValue operator +(FloatValue left, FloatValue right) => new(left._value + right._value);

tests/AltaSoft.DomainPrimitives.Generator.Tests/Snapshots/DomainPrimitiveGeneratorTest.FloatValue_GeneratesAllInterfacesAndConverters#FloatValue.g.verified.cs

@@ -98,6 +98,13 @@ public int CompareTo(object? obj)
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static implicit operator Guid(GuidValue value) => (Guid)value._value;
 
+    /// <summary>
+    /// Implicit conversion from <see cref = "GuidValue"/> (nullable) to <see cref = "Guid"/> (nullable)
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    [return: NotNullIfNotNull(nameof(value))]
+    public static implicit operator Guid?(GuidValue? value) => value is null ? null : (Guid?)value.Value._value;
+
     /// <inheritdoc/>
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static GuidValue Parse(string s, IFormatProvider? provider) => Guid.Parse(s, provider);

tests/AltaSoft.DomainPrimitives.Generator.Tests/Snapshots/DomainPrimitiveGeneratorTest.GuidValue_GeneratesAllInterfacesAndConverters#GuidValue.g.verified.cs

@@ -99,6 +99,13 @@ public int CompareTo(object? obj)
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static implicit operator short(ShortValue value) => (short)value._value;
 
+    /// <summary>
+    /// Implicit conversion from <see cref = "ShortValue"/> (nullable) to <see cref = "short"/> (nullable)
+    /// </summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    [return: NotNullIfNotNull(nameof(value))]
+    public static implicit operator short?(ShortValue? value) => value is null ? null : (short?)value.Value._value;
+
     /// <inheritdoc/>
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static bool operator <(ShortValue left, ShortValue right) => left._value < right._value;