[WIP] Fix generated classes new line for annotations

src/NJsonSchema.CodeGeneration.CSharp.Tests/AnnotationsTests.cs

@@ -38,5 +38,39 @@ public async Task When_array_property_is_not_nullable_then_it_does_not_have_a_se
             await VerifyHelper.Verify(code);
             CSharpCompiler.AssertCompile(code);
         }
+
+        [Fact]
+        public async Task When_custom_class_and_property_annotation_templates_are_used_then_annotations_are_on_separate_lines()
+        {
+            // Arrange
+            var json = @"{ 'properties': { 'name': { 'type': 'string' } } }";
+            var schema = await JsonSchema.FromJsonAsync(json);
+
+            var tempDir = Path.Combine(Path.GetTempPath(), "NJsonSchema_AnnotationTest_" + Guid.NewGuid());
+            Directory.CreateDirectory(tempDir);
+            try
+            {
+                File.WriteAllText(Path.Combine(tempDir, "Class.Annotations.liquid"), "[System.Runtime.Serialization.DataContract]");
+                File.WriteAllText(Path.Combine(tempDir, "Class.Property.Annotations.liquid"), "[System.Runtime.Serialization.DataMember]");
+
+                var generator = new CSharpGenerator(schema, new CSharpGeneratorSettings
+                {
+                    ClassStyle = CSharpClassStyle.Poco,
+                    Namespace = "TestNs",
+                    TemplateDirectory = tempDir
+                });
+
+                // Act
+                var code = generator.GenerateFile("MyClass");
+
+                // Assert - annotations should be on their own lines, not on the same line as class/property declarations
+                Assert.Contains("[System.Runtime.Serialization.DataContract]\n    public partial class MyClass", code);
+                Assert.Contains("[System.Runtime.Serialization.DataMember]\n        public string Name", code);
+            }
+            finally
+            {
+                Directory.Delete(tempDir, true);
+            }
+        }
     }
 }

src/NJsonSchema.CodeGeneration.CSharp/Templates/Class.liquid

@@ -34,7 +34,7 @@
 {%- if IsDeprecated -%}
 [System.Obsolete{% if HasDeprecatedMessage %}({{ DeprecatedMessage | literal }}){% endif %}]
 {% endif -%}
-{%- template Class.Annotations -%}
+{%- template Class.Annotations %}
 {{ TypeAccessModifier }} {% if IsAbstract %}abstract {% endif %}partial {{ ClassType }} {{ClassName}} {%- template Class.Inheritance %}
 {
 {%- if IsTuple -%}
@@ -106,7 +106,7 @@
 {%-   if property.IsDeprecated -%}
     [System.Obsolete{% if property.HasDeprecatedMessage %}({{ property.DeprecatedMessage | literal }}){% endif %}]
 {%-   endif -%}
-    {%- template Class.Property.Annotations -%}
+    {%- template Class.Property.Annotations %}
     public {% if UseRequiredKeyword and property.IsRequired %}required {% endif %}{{ property.Type }} {{ property.PropertyName }}{% if RenderInpc == false and RenderPrism == false %} { get; {% if property.HasSetter and RenderRecord == false %}{{ WriteAccessor }}; {% elsif RenderRecord and GenerateNativeRecords %}init; {% endif %}}{% if property.HasDefaultValue and RenderRecord == false and UseRequiredKeyword == false %} = {{ property.DefaultValue }};{% elsif GenerateNullableReferenceTypes and RenderRecord == false and UseRequiredKeyword == false %} = default!;{% endif %}
 {%- else -%}
     {

src/NJsonSchema.CodeGeneration.CSharp/Templates/Enum.liquid

@@ -7,7 +7,7 @@
 {%- if IsEnumAsBitFlags -%}
 [System.Flags]
 {%- endif -%}
-{%- template Enum.Annotations -%}
+{%- template Enum.Annotations %}
 {{ TypeAccessModifier }} enum {{ Name }}{%- if HasExtendedValueRange %} : long{% endif %}
 {
 {%- for enum in Enums %}

src/NJsonSchema.CodeGeneration/DefaultTemplateFactory.cs

@@ -261,7 +261,8 @@ public string Render()
                     var withoutEmptyWhiteSpace = _emptyTemplateCleanupRegex.Replace(trimmed, string.Empty);
 
                     // just to make sure we don't leak out marker
-                    return withoutEmptyWhiteSpace.Replace("__EMPTY-TEMPLATE__", "");
+                    // also handle case where empty annotation template marker is on its own line (e.g. when annotation templates are empty)
+                    return withoutEmptyWhiteSpace.Replace("\n__EMPTY-TEMPLATE__\n", "\n").Replace("__EMPTY-TEMPLATE__", "");
                 }
                 catch (Exception exception)
                 {