Element. Use LibraryElement.exportNamespace directly, do not copy.

Change-Id: Ic436b05ca8b154b1745bbd8c1025c11725ed5add
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/449580
Commit-Queue: Konstantin Shcheglov <[email protected]>
Reviewed-by: Samuel Rawlins <[email protected]>

Author: scheglov

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

@@ -100,7 +100,7 @@ class _MergeCombinators extends ResolvedCorrectionProducer {
         if (element is! LibraryElementImpl) {
           return;
         }
-        originalNamespace = _originalNamespace(element);
+        originalNamespace = element.exportNamespace;
         namespace = _currentNamespace(libraryExport).definedNames2;
       case ImportDirective(:var libraryImport?):
         namespace = getImportNamespace(libraryImport);
@@ -118,7 +118,7 @@ class _MergeCombinators extends ResolvedCorrectionProducer {
       return;
     }
 
-    originalNamespace ??= _originalNamespace(element);
+    originalNamespace ??= element.exportNamespace;
 
     var explicitlyHiddenNames = directive.hideCombinators.hiddenNames;
 
@@ -156,10 +156,6 @@ class _MergeCombinators extends ResolvedCorrectionProducer {
   Namespace _currentNamespace(LibraryExportImpl libraryExport) {
     return namespaceBuilder.createExportNamespaceForDirective2(libraryExport);
   }
-
-  Namespace _originalNamespace(LibraryElementImpl element) {
-    return namespaceBuilder.createExportNamespaceForLibrary(element);
-  }
 }
 
 extension on Namespace {

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

@@ -4,17 +4,13 @@
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart';
-import 'package:analyzer/src/dart/element/element.dart';
-import 'package:analyzer/src/dart/resolver/scope.dart';
 
 /// Returns the [Element] exported from the given [LibraryElement].
 Element? getExportedElement(LibraryElement? library, String name) {
   if (library == null) {
     return null;
   }
-  library as LibraryElementImpl;
-  var namespace = NamespaceBuilder().createExportNamespaceForLibrary(library);
-  return namespace.definedNames2[name];
+  return library.exportNamespace.get2(name);
 }
 
 /// Return the [LibraryImport] that is referenced by [prefixNode], or

pkg/analyzer/lib/src/dart/resolver/scope.dart

@@ -153,13 +153,6 @@ class NamespaceBuilder {
     return Namespace(exportedNames);
   }
 
-  /// Create a namespace representing the export namespace of the given
-  /// [library].
-  Namespace createExportNamespaceForLibrary(LibraryElementImpl library) {
-    var exportedNames = _getExportMapping(library);
-    return Namespace(exportedNames);
-  }
-
   /// Create a namespace representing the import namespace of the given
   /// [importedLibrary].
   Namespace createImportNamespaceForDirective({

pkg/analyzer/lib/src/error/dead_code_verifier.dart

@@ -138,9 +138,7 @@ class DeadCodeVerifier extends RecursiveAstVisitor<void> {
   /// Resolve the names in the given [combinator] in the scope of the given
   /// [library].
   void _checkCombinator(LibraryElementImpl library, Combinator combinator) {
-    Namespace namespace = NamespaceBuilder().createExportNamespaceForLibrary(
-      library,
-    );
+    Namespace namespace = library.exportNamespace;
     NodeList<SimpleIdentifier> names;
     DiagnosticCode warningCode;
     if (combinator is HideCombinator) {

pkg/analyzer/lib/src/generated/element_resolver.dart

@@ -456,9 +456,7 @@ class ElementResolver {
       //
       return;
     }
-    Namespace namespace = NamespaceBuilder().createExportNamespaceForLibrary(
-      library,
-    );
+    Namespace namespace = library.exportNamespace;
     for (Combinator combinator in combinators) {
       NodeList<SimpleIdentifier> names;
       if (combinator is HideCombinator) {