[analyzer] Remove bazel BUILD-based legacy language version detection.

[email protected]

Change-Id: Ie3d93f7f370c9e9ceed671d533f740e3036de054
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/339320
Commit-Queue: Keerti Parthasarathy <[email protected]>
Auto-Submit: Morgan :) <[email protected]>
Reviewed-by: Keerti Parthasarathy <[email protected]>

Author: davidmorgan

pkg/analyzer/lib/src/workspace/blaze.dart

@@ -567,7 +567,6 @@ class BlazeWorkspacePackage extends WorkspacePackage {
   @override
   final BlazeWorkspace workspace;
 
-  bool _buildFileReady = false;
   List<String>? _enabledExperiments;
   Version? _languageVersion;
 
@@ -576,7 +575,6 @@ class BlazeWorkspacePackage extends WorkspacePackage {
 
   @override
   List<String>? get enabledExperiments {
-    _readBuildFile();
     return _enabledExperiments;
   }
 
@@ -585,7 +583,6 @@ class BlazeWorkspacePackage extends WorkspacePackage {
     if (!workspace._provideLanguageVersion) {
       return null;
     }
-    _readBuildFile();
     return _languageVersion ?? workspace._languageVersion;
   }
 
@@ -641,32 +638,4 @@ class BlazeWorkspacePackage extends WorkspacePackage {
 
     return false;
   }
-
-  void _readBuildFile() {
-    if (_buildFileReady) {
-      return;
-    }
-
-    try {
-      _buildFileReady = true;
-      var buildContent = workspace.provider
-          .getFolder(root)
-          .getChildAssumingFile('BUILD')
-          .readAsStringSync();
-      var flattenedBuildContent = buildContent
-          .split('\n')
-          .map((e) => e.trim())
-          .where((e) => !e.startsWith('#'))
-          .map((e) => e.replaceAll(' ', ''))
-          .join();
-      var hasLegacyFlag = const {
-        'dart_package(null_safety=False',
-      }.any(flattenedBuildContent.contains);
-      if (hasLegacyFlag) {
-        _languageVersion = Version.parse('2.9.0');
-      }
-    } on FileSystemException {
-      // ignored
-    }
-  }
 }

pkg/analyzer/test/src/dart/micro/file_resolution.dart

@@ -145,11 +145,7 @@ class FileResolutionTest with ResourceProviderMixin, ResolutionTest {
     );
 
     newFile('/workspace/${file_paths.blazeWorkspaceMarker}', '');
-    newFile('/workspace/dart/test/BUILD', r'''
-dart_package(
-  null_safety = True,
-)
-''');
+    newFile('/workspace/dart/test/BUILD', '');
     createFileResolver();
   }
 

pkg/analyzer/test/src/dart/micro/simple_file_resolver_test.dart

@@ -1858,23 +1858,6 @@ void f(int? a) {
     );
   }
 
-  test_nullSafety_notEnabled() async {
-    newFile('/workspace/dart/test/BUILD', r'''
-dart_package(null_safety = False)
-''');
-
-    await assertErrorsInCode(r'''
-void f(int? a) {}
-''', [
-      error(ParserErrorCode.EXPERIMENT_NOT_ENABLED, 10, 1),
-    ]);
-
-    assertType(
-      findElement.parameter('a').type,
-      'int*',
-    );
-  }
-
   test_part_notInLibrary_libraryDoesNotExist() async {
     // TODO(scheglov): Should report CompileTimeErrorCode.URI_DOES_NOT_EXIST
     await assertNoErrorsInCode(r'''

pkg/analyzer/test/src/dart/resolution/non_nullable_blaze_workspace_test.dart

@@ -75,7 +75,6 @@ import 'mixin_test.dart' as mixin_resolution;
 import 'named_type_test.dart' as named_type;
 import 'namespace_test.dart' as namespace;
 import 'node_text_expectations.dart';
-import 'non_nullable_blaze_workspace_test.dart' as non_nullable_blaze_workspace;
 import 'non_nullable_test.dart' as non_nullable;
 import 'null_assert_pattern_test.dart' as null_assert_pattern;
 import 'null_check_pattern_test.dart' as null_check_pattern;
@@ -184,7 +183,6 @@ main() {
     mixin_resolution.main();
     named_type.main();
     namespace.main();
-    non_nullable_blaze_workspace.main();
     non_nullable.main();
     null_assert_pattern.main();
     null_check_pattern.main();