Enable the prefer_function_declarations_over_variables lint in the analysis server

Change-Id: I53a6cd3c5d3be1c66173f52a7f01d8df63fd9350
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/249727
Commit-Queue: Brian Wilkerson <brianwilkerson@google.com>
Reviewed-by: Samuel Rawlins <srawlins@google.com>

pkg/analysis_server/analysis_options.yaml

@@ -18,7 +18,6 @@ analyzer:
     implementation_imports: ignore
     non_constant_identifier_names: ignore
     overridden_fields: ignore
-    prefer_function_declarations_over_variables: ignore
     prefer_void_to_null: ignore
     provide_deprecation_message: ignore
 

pkg/analysis_server/lib/plugin/edit/assist/assist_core.dart

@@ -10,18 +10,6 @@ import 'package:analyzer_plugin/utilities/assist/assist.dart';
 ///
 /// Clients may not extend, implement or mix-in this class.
 class Assist {
-  /// A comparator that can be used to sort assists by their relevance. The most
-  /// relevant assists will be sorted before assists with a lower relevance.
-  /// Assists with the same relevance are sorted alphabetically.
-  static final Comparator<Assist> SORT_BY_RELEVANCE = (Assist a, Assist b) {
-    if (a.kind.priority != b.kind.priority) {
-      // A higher priority indicates a higher relevance
-      // and should be sorted before a lower priority.
-      return b.kind.priority - a.kind.priority;
-    }
-    return a.change.message.compareTo(b.change.message);
-  };
-
   /// A description of the assist being proposed.
   final AssistKind kind;
 
@@ -35,4 +23,17 @@ class Assist {
   String toString() {
     return 'Assist(kind=$kind, change=$change)';
   }
+
+  /// A function that can be used to sort assists by their relevance.
+  ///
+  /// The most relevant assists will be sorted before assists with a lower
+  /// relevance. Assists with the same relevance are sorted alphabetically.
+  static int compareAssists(Assist a, Assist b) {
+    if (a.kind.priority != b.kind.priority) {
+      // A higher priority indicates a higher relevance
+      // and should be sorted before a lower priority.
+      return b.kind.priority - a.kind.priority;
+    }
+    return a.change.message.compareTo(b.change.message);
+  }
 }

pkg/analysis_server/lib/plugin/edit/fix/fix_core.dart

@@ -11,18 +11,6 @@ import 'package:analyzer_plugin/utilities/fixes/fixes.dart';
 ///
 /// Clients may not extend, implement or mix-in this class.
 class Fix {
-  /// A comparator that can be used to sort fixes by their relevance. The most
-  /// relevant fixes will be sorted before fixes with a lower relevance. Fixes
-  /// with the same relevance are sorted alphabetically.
-  static final Comparator<Fix> SORT_BY_RELEVANCE = (Fix a, Fix b) {
-    if (a.kind.priority != b.kind.priority) {
-      // A higher priority indicates a higher relevance
-      // and should be sorted before a lower priority.
-      return b.kind.priority - a.kind.priority;
-    }
-    return a.change.message.compareTo(b.change.message);
-  };
-
   /// A description of the fix being proposed.
   final FixKind kind;
 
@@ -36,6 +24,19 @@ class Fix {
   String toString() {
     return 'Fix(kind=$kind, change=$change)';
   }
+
+  /// A finction that can be used to sort fixes by their relevance.
+  ///
+  /// The most relevant fixes will be sorted before fixes with a lower
+  /// relevance. Fixes with the same relevance are sorted alphabetically.
+  static int compareFixes(Fix a, Fix b) {
+    if (a.kind.priority != b.kind.priority) {
+      // A higher priority indicates a higher relevance
+      // and should be sorted before a lower priority.
+      return b.kind.priority - a.kind.priority;
+    }
+    return a.change.message.compareTo(b.change.message);
+  }
 }
 
 /// An object used to provide context information for [FixContributor]s.

pkg/analysis_server/lib/src/cider/assists.dart

@@ -37,7 +37,7 @@ class CiderAssistsComputer {
         );
         final processor = AssistProcessor(context);
         final assists = await processor.compute();
-        assists.sort(Assist.SORT_BY_RELEVANCE);
+        assists.sort(Assist.compareAssists);
         result.addAll(assists);
       } on InconsistentAnalysisException {
         // If an InconsistentAnalysisException occurs, it's likely the user modified

pkg/analysis_server/lib/src/cider/fixes.dart

@@ -58,7 +58,7 @@ class CiderFixesComputer {
           );
 
           var fixes = await DartFixContributor().computeFixes(context);
-          fixes.sort(Fix.SORT_BY_RELEVANCE);
+          fixes.sort(Fix.compareFixes);
 
           result.add(
             CiderErrorFixes(error: error, fixes: fixes, lineInfo: lineInfo),

pkg/analysis_server/lib/src/handler/legacy/edit_get_assists.dart

@@ -101,7 +101,7 @@ class EditGetAssistsHandler extends LegacyHandler
       try {
         var processor = AssistProcessor(context);
         var assists = await processor.compute();
-        assists.sort(Assist.SORT_BY_RELEVANCE);
+        assists.sort(Assist.compareAssists);
         for (var assist in assists) {
           changes.add(assist.change);
         }

pkg/analysis_server/lib/src/handler/legacy/edit_get_fixes.dart

@@ -127,7 +127,7 @@ class EditGetFixesHandler extends LegacyHandler
           resourceProvider, error, content, options);
       var fixes = await generator.computeFixes();
       if (fixes.isNotEmpty) {
-        fixes.sort(Fix.SORT_BY_RELEVANCE);
+        fixes.sort(Fix.compareFixes);
         var lineInfo = LineInfo.fromContent(content);
         var result = engine.ErrorsResultImpl(
             session, file, Uri.file(file), lineInfo, false, errors);
@@ -179,7 +179,7 @@ error.errorCode: ${error.errorCode}
           }
 
           if (fixes.isNotEmpty) {
-            fixes.sort(Fix.SORT_BY_RELEVANCE);
+            fixes.sort(Fix.compareFixes);
             var serverError = newAnalysisError_fromEngine(result, error);
             var errorFixes = AnalysisErrorFixes(serverError);
             errorFixesList.add(errorFixes);
@@ -227,7 +227,7 @@ error.errorCode: ${error.errorCode}
           PubspecFixGenerator(resourceProvider, error, content, document);
       var fixes = await generator.computeFixes();
       if (fixes.isNotEmpty) {
-        fixes.sort(Fix.SORT_BY_RELEVANCE);
+        fixes.sort(Fix.compareFixes);
         var lineInfo = LineInfo.fromContent(content);
         var result = engine.ErrorsResultImpl(
             session, file, Uri.file(file), lineInfo, false, errors);

pkg/analysis_server/lib/src/lsp/handlers/handler_code_actions.dart

@@ -35,22 +35,6 @@ class CodeActionHandler
   // CodeAction class).
   final codeActionPriorities = Expando<int>();
 
-  /// A comparator that can be used to sort [CodeActions]s using priorities
-  /// in [codeActionPriorities].
-  ///
-  /// The highest number priority will be sorted before lower number priorities.
-  /// Items with the same priority are sorted alphabetically by their title.
-  late final Comparator<CodeAction> _codeActionComparator =
-      (CodeAction a, CodeAction b) {
-    // We should never be sorting actions without priorities.
-    final aPriority = codeActionPriorities[a] ?? 0;
-    final bPriority = codeActionPriorities[b] ?? 0;
-    if (aPriority != bPriority) {
-      return bPriority - aPriority;
-    }
-    return a.title.compareTo(b.title);
-  };
-
   CodeActionHandler(super.server);
 
   @override
@@ -200,6 +184,21 @@ class CodeActionHandler
         : Either2<CodeAction, Command>.t2(command);
   }
 
+  /// A function that can be used to sort [CodeActions]s using priorities
+  /// in [codeActionPriorities].
+  ///
+  /// The highest number priority will be sorted before lower number priorities.
+  /// Items with the same priority are sorted alphabetically by their title.
+  int _compareCodeActions(CodeAction a, CodeAction b) {
+    // We should never be sorting actions without priorities.
+    final aPriority = codeActionPriorities[a] ?? 0;
+    final bPriority = codeActionPriorities[b] ?? 0;
+    if (aPriority != bPriority) {
+      return bPriority - aPriority;
+    }
+    return a.title.compareTo(b.title);
+  }
+
   /// Creates a CodeAction to apply this assist. Note: This code will fetch the
   /// version of each document being modified so it's important to call this
   /// immediately after computing edits to ensure the document is not modified
@@ -318,7 +317,7 @@ class CodeActionHandler
       }));
 
       final dedupedCodeActions = _dedupeActions(codeActions, range.start);
-      dedupedCodeActions.sort(_codeActionComparator);
+      dedupedCodeActions.sort(_compareCodeActions);
 
       return dedupedCodeActions
           .where((action) => shouldIncludeKind(action.kind))
@@ -450,7 +449,7 @@ class CodeActionHandler
       codeActions.addAll(pluginFixActions);
 
       final dedupedActions = _dedupeActions(codeActions, range.start);
-      dedupedActions.sort(_codeActionComparator);
+      dedupedActions.sort(_compareCodeActions);
 
       return dedupedActions
           .where((action) => shouldIncludeKind(action.kind))

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

@@ -1433,7 +1433,7 @@ class FixProcessor extends BaseProcessor {
 
   Future<Fix?> computeFix() async {
     await _addFromProducers();
-    fixes.sort(Fix.SORT_BY_RELEVANCE);
+    fixes.sort(Fix.compareFixes);
     return fixes.isNotEmpty ? fixes.first : null;
   }