✨ Added ColorConverter

Author: Guldem

lib/chopper/chopper.dart

@@ -1,5 +1,7 @@
 /// DCC Toolkit chopper util.
 library chopper;
 
+export 'color_converter.dart';
+export 'datetime_converter.dart';
 export 'json_serializable_converter.dart';
 export 'no_content.dart';

lib/chopper/color_converter.dart

@@ -0,0 +1,30 @@
+import 'dart:ui';
+
+import 'package:freezed_annotation/freezed_annotation.dart';
+
+/// A class that implements JsonConverter to convert Color objects to and from JSON.
+class ColorConverter implements JsonConverter<Color, String> {
+  /// Converts a hexadecimal color string from JSON to a Color object.
+  ///
+  /// The input string [json] is expected to be a hexadecimal color string.
+  /// The method returns a Color object representing the color.
+  @override
+  Color fromJson(String json) {
+    var hexColor = json.toUpperCase().replaceAll('#', '');
+    if (hexColor.length == 6) {
+      hexColor = 'FF$hexColor';
+    }
+    return Color(int.parse(hexColor, radix: 16));
+  }
+
+  /// Converts a Color object to a hexadecimal color string for JSON.
+  ///
+  /// The input [color] is a Color object.
+  /// The method returns a string in the format #AARRGGBB, where AA is the alpha value,
+  /// RR is the red value, GG is the green value, and BB is the blue value.
+  /// Each value is a two-digit hexadecimal number.
+  @override
+  String toJson(Color color) {
+    return '#${color.value.toRadixString(16).padLeft(8, '0')}';
+  }
+}

test/chopper/color_converter_test.dart

@@ -0,0 +1,32 @@
+import 'dart:ui';
+
+import 'package:dcc_toolkit/chopper/color_converter.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:parameterized_test/parameterized_test.dart';
+
+void main() {
+  parameterizedTest2('converts color to json value', [
+    [const Color(0xFF000000), '#ff000000'],
+    [const Color(0xFFFF0000), '#ffff0000'],
+    [const Color(0xFFFFFF00), '#ffffff00'],
+    [const Color(0xFFFFFFFF), '#ffffffff'],
+    [const Color(0xF1F1F1F1), '#f1f1f1f1'],
+  ], (Color color, String expected) {
+    final result = ColorConverter().toJson(color);
+
+    expect(result, expected);
+  });
+
+  parameterizedTest2('converts json value to color', [
+    [const Color(0xFF000000), '#ff000000'],
+    [const Color(0xFFFF0000), '#ffff0000'],
+    [const Color(0xFFFFFF00), '#ffffff00'],
+    [const Color(0xFFFFFFFF), '#ffffffff'],
+    [const Color(0xF1F1F1F1), '#f1f1f1f1'],
+    [const Color(0xFFFFFFFF), '#ffffff'],
+  ], (Color expected, String json) {
+    final result = ColorConverter().fromJson(json);
+
+    expect(result, expected);
+  });
+}