[CQ] add feature isEnabled utility

Change-Id: I267aee8da50ec073a28bdb22ebe5379d31b1dc91
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/403265
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Auto-Submit: Phil Quitslund <pquitslund@google.com>
Commit-Queue: Brian Wilkerson <brianwilkerson@google.com>

pkg/analysis_server/lib/src/services/correction/dart/add_key_to_constructors.dart

@@ -95,7 +95,7 @@ class AddKeyToConstructors extends ResolvedCorrectionProducer {
         }
         builder.write(className);
         builder.write('({');
-        if (libraryElement2.featureSet.isEnabled(Feature.super_parameters)) {
+        if (isEnabled(Feature.super_parameters)) {
           builder.write('super.key});');
         } else {
           builder.writeType(keyType);
@@ -115,9 +115,7 @@ class AddKeyToConstructors extends ResolvedCorrectionProducer {
     if (keyType == null) {
       return;
     }
-    var superParameters = libraryElement2.featureSet.isEnabled(
-      Feature.super_parameters,
-    );
+    var superParameters = isEnabled(Feature.super_parameters);
 
     void writeKey(DartEditBuilder builder) {
       if (superParameters) {

pkg/analysis_server/lib/src/services/correction/dart/add_super_parameter.dart

@@ -33,7 +33,7 @@ class AddSuperParameter extends ResolvedCorrectionProducer {
 
   @override
   Future<void> compute(ChangeBuilder builder) async {
-    if (!libraryElement2.featureSet.isEnabled(Feature.super_parameters)) {
+    if (!isEnabled(Feature.super_parameters)) {
       return;
     }
 

pkg/analysis_server/lib/src/services/correction/dart/convert_class_to_enum.dart

@@ -39,7 +39,7 @@ class ConvertClassToEnum extends ResolvedCorrectionProducer {
 
   @override
   Future<void> compute(ChangeBuilder builder) async {
-    if (!libraryElement2.featureSet.isEnabled(Feature.enhanced_enums)) {
+    if (!isEnabled(Feature.enhanced_enums)) {
       // If the library doesn't support enhanced_enums then the class can't be
       // converted.
       return;

pkg/analysis_server/lib/src/services/correction/dart/convert_to_if_case_statement.dart

@@ -27,7 +27,7 @@ class ConvertToIfCaseStatement extends ResolvedCorrectionProducer {
 
   @override
   Future<void> compute(ChangeBuilder builder) async {
-    if (!libraryElement2.featureSet.isEnabled(Feature.patterns)) {
+    if (!isEnabled(Feature.patterns)) {
       return;
     }
 

pkg/analysis_server/lib/src/services/correction/dart/convert_to_super_parameters.dart

@@ -36,7 +36,7 @@ class ConvertToSuperParameters extends ResolvedCorrectionProducer {
 
   @override
   Future<void> compute(ChangeBuilder builder) async {
-    if (!libraryElement2.featureSet.isEnabled(Feature.super_parameters)) {
+    if (!isEnabled(Feature.super_parameters)) {
       // If the library doesn't support super_parameters then the change isn't
       // appropriate.
       return;

pkg/analysis_server/lib/src/services/correction/dart/convert_to_switch_statement.dart

@@ -29,7 +29,7 @@ class ConvertIfStatementToSwitchStatement extends ResolvedCorrectionProducer {
 
   @override
   Future<void> compute(ChangeBuilder builder) async {
-    if (!libraryElement2.featureSet.isEnabled(Feature.patterns)) {
+    if (!isEnabled(Feature.patterns)) {
       return;
     }
 

pkg/analysis_server/lib/src/services/correction/dart/create_constructor_super.dart

@@ -67,7 +67,7 @@ class _CreateConstructor extends ResolvedCorrectionProducer {
     var buffer = StringBuffer();
     buffer.write('super');
     var constructorName = _constructor.name3;
-    if (libraryElement2.featureSet.isEnabled(Feature.super_parameters)) {
+    if (isEnabled(Feature.super_parameters)) {
       if (constructorName != null && constructorName != 'new') {
         buffer.write('.');
         buffer.write(constructorName);
@@ -90,7 +90,7 @@ class _CreateConstructor extends ResolvedCorrectionProducer {
 
   @override
   Future<void> compute(ChangeBuilder builder) async {
-    if (libraryElement2.featureSet.isEnabled(Feature.super_parameters)) {
+    if (isEnabled(Feature.super_parameters)) {
       await _computeWithSuperParameters(builder);
     } else {
       await _computeWithoutSuperParameters(builder);

pkg/analysis_server/lib/src/services/correction/dart/move_annotation_to_library_directive.dart

@@ -47,7 +47,7 @@ class MoveAnnotationToLibraryDirective extends ResolvedCorrectionProducer {
       return;
     }
 
-    if (!libraryElement2.featureSet.isEnabled(Feature.unnamedLibraries)) {
+    if (!isEnabled(Feature.unnamedLibraries)) {
       // If the library doesn't support unnamed libraries, then we cannot add
       // a new library directive; we don't know what to name it.
       return;

pkg/analysis_server/lib/src/services/correction/dart/move_doc_comment_to_library_directive.dart

@@ -37,7 +37,7 @@ class MoveDocCommentToLibraryDirective extends ResolvedCorrectionProducer {
     var firstDirective = compilationUnit.directives.firstOrNull;
     if (firstDirective is LibraryDirective) {
       await _moveToExistingLibraryDirective(builder, comment, firstDirective);
-    } else if (libraryElement2.featureSet.isEnabled(Feature.unnamedLibraries)) {
+    } else if (isEnabled(Feature.unnamedLibraries)) {
       await _moveToNewLibraryDirective(builder, comment, compilationUnit);
     }
 

pkg/analysis_server_plugin/lib/edit/dart/correction_producer.dart

@@ -10,6 +10,7 @@ import 'package:analysis_server_plugin/edit/fix/dart_fix_context.dart';
 import 'package:analysis_server_plugin/src/utilities/selection.dart';
 import 'package:analyzer/dart/analysis/analysis_options.dart';
 import 'package:analyzer/dart/analysis/code_style_options.dart';
+import 'package:analyzer/dart/analysis/features.dart';
 import 'package:analyzer/dart/analysis/results.dart';
 import 'package:analyzer/dart/element/element2.dart';
 import 'package:analyzer/dart/element/nullability_suffix.dart';
@@ -613,6 +614,9 @@ abstract class ResolvedCorrectionProducer
     // We don't know.
     return null;
   }
+
+  bool isEnabled(Feature feature) =>
+      libraryElement2.featureSet.isEnabled(feature);
 }
 
 final class StubCorrectionProducerContext implements CorrectionProducerContext {