Fine. Support for extensions in ManifestElementKind.

Change-Id: Ia097086e6af98d963f534dd6e5999f76cbe4a2a2
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/444501
Commit-Queue: Konstantin Shcheglov <[email protected]>
Reviewed-by: Johnni Winther <[email protected]>

Author: scheglov

pkg/analyzer/lib/src/fine/manifest_context.dart

@@ -207,6 +207,7 @@ final class ManifestElement {
 enum ManifestElementKind {
   class_,
   enum_,
+  extension_,
   extensionType,
   mixin_,
   typeAlias,
@@ -226,6 +227,8 @@ enum ManifestElementKind {
         return ManifestElementKind.class_;
       case EnumElement():
         return ManifestElementKind.enum_;
+      case ExtensionElement():
+        return ManifestElementKind.extension_;
       case ExtensionTypeElement():
         return ManifestElementKind.extensionType;
       case MixinElement():

pkg/analyzer/test/src/dart/analysis/driver_test.dart

@@ -44672,6 +44672,66 @@ const d = A.b;
     );
   }
 
+  test_manifest_constInitializer_prefixedIdentifier_extensionName_fieldName() async {
+    await _runLibraryManifestScenario(
+      initialCode: r'''
+extension A on Object {
+  static const a = 0;
+  static const b = 0;
+}
+
+const c = A.a;
+const d = A.b;
+''',
+      expectedInitialEvents: r'''
+[operation] linkLibraryCycle SDK
+[operation] linkLibraryCycle
+  package:test/test.dart
+    declaredExtensions
+      A: #M0
+        declaredFields
+          a: #M1
+          b: #M2
+        declaredGetters
+          a: #M3
+          b: #M4
+    declaredGetters
+      c: #M5
+      d: #M6
+    declaredVariables
+      c: #M7
+      d: #M8
+''',
+      updatedCode: r'''
+extension A on Object {
+  static const a = 0;
+  static const b = 1;
+}
+
+const c = A.a;
+const d = A.b;
+''',
+      expectedUpdatedEvents: r'''
+[operation] linkLibraryCycle
+  package:test/test.dart
+    declaredExtensions
+      A: #M0
+        declaredFields
+          a: #M1
+          b: #M9
+        declaredGetters
+          a: #M3
+          b: #M4
+    declaredGetters
+      c: #M5
+      d: #M6
+    declaredVariables
+      c: #M7
+      d: #M10
+''',
+    );
+  }
+
   test_manifest_constInitializer_prefixedIdentifier_importPrefix_className_fieldName() async {
     var a = newFile('$testPackageLibPath/a.dart', r'''
 class A {

pkg/analyzer/test/src/summary/elements/metadata_test.dart

@@ -6932,6 +6932,55 @@ library
 ''');
   }
 
+  test_metadata_value_extension_staticField_unnamed() async {
+    var library = await buildLibrary('''
+extension on Object {
+  @foo
+  static const foo = 0;
+}
+''');
+    checkElementText(library, r'''
+library
+  reference: <testLibrary>
+  fragments
+    #F0 <testLibraryFragment>
+      element: <testLibrary>
+      extensions
+        #F1 extension <null-name> (nameOffset:<null>) (firstTokenOffset:0) (offset:0)
+          element: <testLibrary>::@extension::0
+          fields
+            #F2 hasInitializer foo (nameOffset:44) (firstTokenOffset:44) (offset:44)
+              element: <testLibrary>::@extension::0::@field::foo
+              initializer: expression_0
+                IntegerLiteral
+                  literal: 0 @50
+                  staticType: int
+          getters
+            #F3 synthetic foo (nameOffset:<null>) (firstTokenOffset:<null>) (offset:44)
+              element: <testLibrary>::@extension::0::@getter::foo
+  extensions
+    extension <null-name>
+      reference: <testLibrary>::@extension::0
+      firstFragment: #F1
+      extendedType: Object
+      fields
+        static const hasInitializer foo
+          reference: <testLibrary>::@extension::0::@field::foo
+          firstFragment: #F2
+          type: int
+          constantInitializer
+            fragment: #F2
+            expression: expression_0
+          getter: <testLibrary>::@extension::0::@getter::foo
+      getters
+        synthetic static foo
+          reference: <testLibrary>::@extension::0::@getter::foo
+          firstFragment: #F3
+          returnType: int
+          variable: <testLibrary>::@extension::0::@field::foo
+''');
+  }
+
   test_metadata_value_prefix_extension_staticField() async {
     newFile('$testPackageLibPath/foo.dart', '''
 extension E on int {