feat: add nullable accessors option to DogsGeneratorSettings

The feature can be enabled using the 'nullable_accessors' pubspec flag.

Refs: #26

Author: helightdev

docs/basics/options.md

@@ -11,6 +11,7 @@ dogs:
   property_case: keep
   name_case: keep
   enum_case: keep
+  nullable_accessors: false
 ```
 
 ## Options
@@ -23,6 +24,8 @@ Defines the casing style for generated property names.
 Defines the casing style for generated class and enum serial names.
 #### `enum_case` (default: `keep`)
 Defines the casing style for generated enum values.
+#### `nullable_accessors` (default: `false`)
+Forces builder accessor nullability regardless of the field nullability.
 
 ## Casing Options
 - `keep`: Keep the original name.

packages/dogs_generator/lib/builders/converter_builder.dart

@@ -137,7 +137,7 @@ class ConverterBuilder extends DogsAdapter<Serializable> {
     writeGeneratedConverter(element, structurized, constructorName, codeContext);
     if (structurized.fieldNames.isNotEmpty &&
         structurized.structure.conformity != StructureConformity.bean) {
-      writeGeneratedBuilder(element, structurized, constructorName, codeContext);
+      writeGeneratedBuilder(element, structurized, constructorName, codeContext, settings);
       writeGeneratedExtension(element, structurized, constructorName, codeContext);
     }
   }
@@ -279,7 +279,7 @@ If you wish to use class-level generics, please implement a TreeBaseConverterFac
   }
 
   static void writeGeneratedBuilder(ClassElement2 element, StructurizeResult structurized,
-      String constructorName, SubjectCodeContext codeContext) {
+      String constructorName, SubjectCodeContext codeContext, DogsGeneratorSettings settings) {
     var emitter = DartEmitter();
     var copyWithFrontendName = "${element.displayName}\$Copy";
     var copyClazz = Class((builder) {
@@ -328,13 +328,13 @@ If you wish to use class-level generics, please implement a TreeBaseConverterFac
           ..type = MethodType.setter
           ..requiredParameters.add(Parameter((builder) => builder
             ..name = "value"
-            ..type = Reference(element.type + (element.optional ? "?" : ""))))
+            ..type = Reference(element.type + ((element.optional || settings.nullableAccessors) ? "?" : ""))))
           ..body = Code("\$values[$index] = value;")));
 
         builder.methods.add(Method((builder) => builder
           ..name = element.accessor
           ..type = MethodType.getter
-          ..returns = Reference(element.type + (element.optional ? "?" : ""))
+          ..returns = Reference(element.type + ((element.optional || settings.nullableAccessors) ? "?" : ""))
           ..lambda = true
           ..body = Code("\$values[$index]")));
       }

packages/dogs_generator/lib/settings.dart

@@ -4,6 +4,7 @@ import 'package:recase/recase.dart';
 
 class DogsGeneratorSettings {
   bool isLibrary = false;
+  bool nullableAccessors = false;
   CasingType propertyCase = CasingType.keep;
   CasingType nameCase = CasingType.keep;
   CasingType enumCase = CasingType.keep;
@@ -39,6 +40,11 @@ class DogsGeneratorSettings {
         if (enumCasingValue is String) {
           settings.enumCase = CasingType.fromString(enumCasingValue);
         }
+        
+        var nullableAccessorsValue = map["nullable_accessors"];
+        if (nullableAccessorsValue is bool) {
+          settings.nullableAccessors = nullableAccessorsValue;
+        }
       }
     } catch (ex) {
       log.warning("Can't resolve package pubspec.yaml with error: $ex. Using default values.");

smoke/test1/pubspec.yaml

@@ -21,3 +21,6 @@ dev_dependencies:
 
   lints: ^2.0.1
   test: ^1.23.1
+
+dogs:
+  nullable_accessors: true