[cfe] Add CFE test for DartScope

This adds a CFE test for DartScope that shares the data with the
corresponding DDC test. The CFE test uses the DartScopeBuilder2
which is currently in development to replace the DartScopeBuilder.

Change-Id: I0d6c76957e7a5d28babab14110d430935e686b22
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/335821
Reviewed-by: Jens Johansen <jensj@google.com>
Reviewed-by: Nicholas Shahan <nshahan@google.com>
Commit-Queue: Johnni Winther <johnniwinther@google.com>

pkg/dev_compiler/analysis_options.yaml

@@ -16,7 +16,6 @@ analyzer:
     - node_modules/**
     - test/codegen/**
     - test/samples/**
-    - test/scopes/data/**
     - test/transformer/hello_app/**
 
 linter:

pkg/dev_compiler/test/scopes/scope_test.dart

@@ -14,7 +14,8 @@ import 'package:kernel/dart_scope_calculator.dart';
 import '../id_testing_helper.dart';
 
 Future<void> main(List<String> args) async {
-  var dataDir = Directory.fromUri(Platform.script.resolve('data'));
+  var dataDir = Directory.fromUri(
+      Platform.script.resolve('../../../front_end/test/scopes/data'));
   await runTests<Features>(dataDir,
       args: args,
       createUriForFileName: createUriForFileName,

pkg/front_end/analysis_options_no_lints.yaml

@@ -17,6 +17,7 @@ analyzer:
     - test/macros/incremental/data/**
     - test/patching/data/**
     - test/predicates/data/**
+    - test/scopes/data/**
     - test/static_types/data/**
     - test/text_representation/data/**
     - testcases/**

pkg/front_end/test/scopes/data/marker.options

@@ -1 +1,2 @@
+cfe=pkg/front_end/test/scopes/scope_test.dart
 ddc=pkg/dev_compiler/test/scopes/scope_test.dart

pkg/front_end/test/scopes/scope_test.dart

@@ -0,0 +1,90 @@
+// Copyright (c) 2023, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'dart:io' show Directory, Platform;
+
+import 'package:_fe_analyzer_shared/src/testing/id.dart' show ActualData, Id;
+import 'package:_fe_analyzer_shared/src/testing/id_testing.dart';
+import 'package:_fe_analyzer_shared/src/testing/features.dart';
+import 'package:front_end/src/testing/id_testing_helper.dart';
+import 'package:kernel/ast.dart';
+import 'package:kernel/dart_scope_calculator.dart';
+
+Future<void> main(List<String> args) async {
+  Directory dataDir = new Directory.fromUri(Platform.script.resolve('data'));
+  await runTests<Features>(dataDir,
+      args: args,
+      createUriForFileName: createUriForFileName,
+      onFailure: onFailure,
+      runTest: runTestFor(const ScopeDataComputer(), [defaultCfeConfig]));
+}
+
+class Tags {
+  static const String cls = 'class';
+  static const String member = 'member';
+  static const String isStatic = 'static';
+  static const String typeParameter = 'typeParameters';
+  static const String variables = 'variables';
+}
+
+class ScopeDataComputer extends CfeDataComputer<Features> {
+  const ScopeDataComputer();
+
+  @override
+  void computeMemberData(CfeTestResultData testResultData, Member member,
+      Map<Id, ActualData<Features>> actualMap,
+      {bool? verbose}) {
+    member.accept(ScopeDataExtractor(member.enclosingLibrary,
+        member.enclosingClass, testResultData.compilerResult, actualMap));
+  }
+
+  @override
+  DataInterpreter<Features> get dataValidator =>
+      const FeaturesDataInterpreter();
+}
+
+class ScopeDataExtractor extends CfeDataExtractor<Features> {
+  final Library library;
+  final Class? cls;
+
+  ScopeDataExtractor(
+      this.library, this.cls, super.compilerResult, super.actualMap);
+
+  Component get component => compilerResult.component!;
+
+  @override
+  Features? computeNodeValue(Id id, TreeNode node) {
+    // We use references to a static variable 'x' as the marker for where we
+    // want to compute the scope.
+    if (node is StaticGet && node.target.name.text == 'x') {
+      Location? location = node.location;
+      if (location != null) {
+        List<DartScope> scopes = DartScopeBuilder2.findScopeFromOffsetAndClass(
+            library, location.file, cls, node.fileOffset);
+        if (scopes.isNotEmpty) {
+          // TODO(johnniwinther,jensj): Support more than one scope.
+          DartScope scope = scopes.first;
+          Features features = Features();
+          if (scope.cls != null) {
+            features[Tags.cls] = scope.cls!.name;
+          }
+          if (scope.member != null) {
+            features[Tags.member] = scope.member!.name.text;
+          }
+          if (scope.isStatic) {
+            features.add(Tags.isStatic);
+          }
+          for (TypeParameter typeParameter in scope.typeParameters) {
+            features.addElement(Tags.typeParameter, typeParameter.name!);
+          }
+          for (String variable in scope.definitions.keys) {
+            features.addElement(Tags.variables, variable);
+          }
+          return features;
+        }
+      }
+    }
+    return super.computeNodeValue(id, node);
+  }
+}