[material_ui] Migrate M3 Badge template to use new gen_defaults

packages/material_ui/lib/src/badge.dart

@@ -17,6 +17,8 @@ import 'badge_theme.dart';
 import 'color_scheme.dart';
 import 'theme.dart';
 
+part 'generated/badge_defaults_m3.g.dart';
+
 /// A Material Design "badge".
 ///
 /// A badge's [label] conveys a small amount of information about its
@@ -476,36 +478,3 @@ class _RenderIntrinsicHorizontalStadium extends RenderProxyBox {
     size = _computeSize(layoutChild: ChildLayoutHelper.layoutChild, constraints: constraints);
   }
 }
-
-// BEGIN GENERATED TOKEN PROPERTIES - Badge
-
-// Do not edit by hand. The code between the "BEGIN GENERATED" and
-// "END GENERATED" comments are generated from data in the Material
-// Design token database by the script:
-//   dev/tools/gen_defaults/bin/gen_defaults.dart.
-
-// dart format off
-class _BadgeDefaultsM3 extends BadgeThemeData {
-  _BadgeDefaultsM3(this.context) : super(
-    smallSize: 6.0,
-    largeSize: 16.0,
-    padding: const EdgeInsets.symmetric(horizontal: 4),
-    alignment: AlignmentDirectional.topEnd,
-  );
-
-  final BuildContext context;
-  late final ThemeData _theme = Theme.of(context);
-  late final ColorScheme _colors = _theme.colorScheme;
-
-  @override
-  Color? get backgroundColor => _colors.error;
-
-  @override
-  Color? get textColor => _colors.onError;
-
-  @override
-  TextStyle? get textStyle => Theme.of(context).textTheme.labelSmall;
-}
-// dart format on
-
-// END GENERATED TOKEN PROPERTIES - Badge

packages/material_ui/tool/gen_defaults/temporarily_excluded/generated/badge_defaults.g.dart → packages/material_ui/lib/src/generated/badge_defaults_m3.g.dart

@@ -2,6 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// Do not edit by hand. The code is generated from data in the Material
+// Design token database by the script:
+//   packages/material_ui/tool/gen_defaults/bin/gen_defaults.dart.
+part of '../badge.dart';
+
 class _BadgeDefaultsM3 extends BadgeThemeData {
   _BadgeDefaultsM3(this.context)
     : super(

packages/material_ui/tool/gen_defaults/bin/gen_defaults.dart

@@ -14,7 +14,8 @@ import 'package:args/args.dart';
 
 // import '../templates/action_chip_template.dart';
 import '../templates/app_bar_template.dart';
-// import '../templates/badge_template.dart';
+import '../templates/badge_template.dart';
+
 // import '../templates/banner_template.dart';
 // import '../templates/bottom_app_bar_template.dart';
 // import '../templates/bottom_sheet_template.dart';
@@ -65,7 +66,7 @@ Future<void> main(List<String> args) async {
 
   // const ActionChipTemplateM3().generateFile(verbose: verbose);
   const AppBarTemplateM3().generateFile(verbose: verbose);
-  // const BadgeTemplateM3().generateFile(verbose: verbose);
+  const BadgeTemplateM3().generateFile(verbose: verbose);
   // const BannerTemplateM3().generateFile(verbose: verbose);
   // const BottomAppBarTemplateM3().generateFile(verbose: verbose);
   // const BottomSheetTemplateM3().generateFile(verbose: verbose);

packages/material_ui/tool/gen_defaults/templates/badge_template.dart

@@ -0,0 +1,42 @@
+// Copyright 2013 The Flutter Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import '../data/badge.dart';
+import 'template.dart';
+
+class BadgeTemplateM3 extends TokenTemplateM3 {
+  const BadgeTemplateM3();
+
+  @override
+  String get name => 'Badge';
+
+  @override
+  String get parentFilePath => 'badge.dart';
+
+  @override
+  String generateContents(String className) =>
+      '''
+class $className extends BadgeThemeData {
+  $className(this.context) : super(
+    smallSize: ${number(TokenBadge.size)},
+    largeSize: ${number(TokenBadge.largeSize)},
+    padding: const EdgeInsets.symmetric(horizontal: 4),
+    alignment: AlignmentDirectional.topEnd,
+  );
+
+  final BuildContext context;
+  late final ThemeData _theme = Theme.of(context);
+  late final ColorScheme _colors = _theme.colorScheme;
+
+  @override
+  Color? get backgroundColor => ${color(TokenBadge.color, '_colors')};
+
+  @override
+  Color? get textColor => ${color(TokenBadge.largeLabelTextColor, '_colors')};
+
+  @override
+  TextStyle? get textStyle => Theme.of(context).textTheme.labelSmall;
+}
+''';
+}

packages/material_ui/tool/gen_defaults/test/gen_defaults_test.dart

@@ -8,6 +8,7 @@ import 'package:test/test.dart';
 import '../data/color_role.dart';
 import '../data/shape_struct.dart';
 import '../templates/app_bar_template.dart';
+import '../templates/badge_template.dart';
 import '../templates/template.dart';
 import 'test_fixtures/test_templates.dart';
 
@@ -165,9 +166,19 @@ void main() {
       expect(contents, contains('static const double expandedHeight = 152.0'));
     });
 
-    test('BadgeTemplateM3 emits M3 Badge defaults from tokens', () {
-      // Intentionally empty, will be implemented during migration. See:
-      // https://github.com/flutter/flutter/issues/187899
+    test('BadgeTemplateM3 emits M3 Badge defaults from badge tokens', () {
+      final String contents = const BadgeTemplateM3().generateContents('_BadgeDefaultsM3');
+      expect(contents, contains('class _BadgeDefaultsM3 extends BadgeThemeData'));
+      expect(contents, contains('smallSize: 6.0'));
+      expect(contents, contains('largeSize: 16.0'));
+      expect(contents, contains('padding: const EdgeInsets.symmetric(horizontal: 4)'));
+      expect(contents, contains('alignment: AlignmentDirectional.topEnd'));
+      expect(contents, contains('Color? get backgroundColor => _colors.error'));
+      expect(contents, contains('Color? get textColor => _colors.onError'));
+      expect(
+        contents,
+        contains('TextStyle? get textStyle => Theme.of(context).textTheme.labelSmall'),
+      );
     });
 
     test('BannerTemplateM3 emits M3 Banner defaults from tokens', () {