feat: Add avoid_hardcoded_color rule

.vscode/settings.json

@@ -11,6 +11,7 @@
         "ints",
         "pubspec",
         "redeclares",
+        "RGBO",
         "subosito",
         "Supertypes",
         "tearoffs",

packages/altive_lints/lib/altive_lints.dart

@@ -1,5 +1,6 @@
 import 'package:custom_lint_builder/custom_lint_builder.dart';
 
+import 'src/lints/avoid_hardcoded_color.dart';
 import 'src/lints/avoid_hardcoded_japanese.dart';
 import 'src/lints/avoid_shrink_wrap_in_list_view.dart';
 import 'src/lints/avoid_single_child.dart';
@@ -9,6 +10,7 @@ PluginBase createPlugin() => _AltivePlugin();
 class _AltivePlugin extends PluginBase {
   @override
   List<LintRule> getLintRules(CustomLintConfigs configs) => [
+        const AvoidHardcodedColor(),
         const AvoidHardcodedJapanese(),
         const AvoidShrinkWrapInListView(),
         const AvoidSingleChild(),

packages/altive_lints/lib/src/lints/avoid_hardcoded_color.dart

@@ -0,0 +1,78 @@
+import 'package:analyzer/dart/element/element.dart';
+import 'package:analyzer/dart/element/type.dart';
+import 'package:analyzer/error/listener.dart';
+import 'package:custom_lint_builder/custom_lint_builder.dart';
+
+/// An `avoid_hardcoded_color` rule that discourages the use of
+/// hardcoded colors directly in the code, promoting the use of `ColorScheme`,
+/// `ThemeExtension`, or other Theme-based systems for defining colors.
+///
+/// This practice ensures that colors are consistent and
+/// adaptable to different themes and accessibility settings.
+///
+/// ### Example
+///
+/// #### BAD:
+///
+/// ```dart
+/// Container(
+///   color: Color(0xFF00FF00), // LINT
+/// );
+/// ```
+///
+/// #### GOOD:
+///
+/// ```dart
+/// Container(
+///   color: Theme.of(context).colorScheme.primary,
+/// );
+/// ```
+class AvoidHardcodedColor extends DartLintRule {
+  const AvoidHardcodedColor() : super(code: _lintCode);
+
+  static const _lintCode = LintCode(
+    name: 'avoid_hardcoded_color',
+    problemMessage: 'Avoid using hardcoded color. Use ColorScheme, '
+        'ThemeExtension, or other Theme-based color definitions instead. '
+        'Consider using Theme.of(context).colorScheme or a custom '
+        'ThemeExtension for color definitions.',
+  );
+
+  @override
+  void run(
+    CustomLintResolver resolver,
+    ErrorReporter reporter,
+    CustomLintContext context,
+  ) {
+    context.registry.addInstanceCreationExpression((node) {
+      final typeName =
+          node.staticType?.getDisplayString(withNullability: false);
+
+      if (typeName == 'Color') {
+        reporter.reportErrorForNode(code, node);
+      }
+    });
+
+    context.registry.addPrefixedIdentifier((node) {
+      final prefix = node.prefix.name;
+      if (prefix == 'Colors') {
+        final element = node.staticElement;
+        if (element is PropertyAccessorElement) {
+          final returnType = element.returnType;
+          if (_isColorType(returnType)) {
+            reporter.reportErrorForNode(code, node);
+          }
+        }
+      }
+    });
+  }
+
+  bool _isColorType(DartType? type) {
+    return type != null &&
+        (type.isDartCoreInt ||
+            type.getDisplayString(withNullability: false) == 'Color' ||
+            type.getDisplayString(withNullability: false) == 'MaterialColor' ||
+            type.getDisplayString(withNullability: false) ==
+                'MaterialAccentColor');
+  }
+}

packages/altive_lints/lint_test/lints/avoid_hardcoded_color.dart

@@ -0,0 +1,20 @@
+import 'package:flutter/material.dart';
+
+class MyWidget extends StatelessWidget {
+  const MyWidget({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Column(
+      children: [
+        // expect_lint: avoid_hardcoded_color
+        const ColoredBox(color: Color(0xFF00FF00)),
+        // expect_lint: avoid_hardcoded_color
+        const ColoredBox(color: Color.fromRGBO(0, 255, 0, 1)),
+        // expect_lint: avoid_hardcoded_color
+        const ColoredBox(color: Colors.green),
+        ColoredBox(color: Theme.of(context).colorScheme.primary),
+      ],
+    );
+  }
+}