[messages] Remove _SyntacticErrorGenerator class.

Despite its name, `_SyntacticErrorGenerator` didn't actually do any
code generation; it simply iterated through the analyzer's
`ParserErrorCode`s looking for diagnostics that could potentially be
shared with the CFE. This logic was part of a previous effort to unify
analyzer and CFE error codes, and is no longer needed. Removing it
will make it easier to clean up and refactor the logic for handling
shared error codes.

Change-Id: I6a6a69647555aa071c20cb79a12ce5c8c24ee9dd
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/451900
Reviewed-by: Samuel Rawlins <[email protected]>
Reviewed-by: Konstantin Shcheglov <[email protected]>
Commit-Queue: Paul Berry <[email protected]>

Author: stereotype441

pkg/analyzer/tool/messages/generate.dart

@@ -17,21 +17,17 @@
 library;
 
 import 'dart:convert';
-import 'dart:io';
 
 import 'package:analyzer_testing/package_root.dart' as pkg_root;
 import 'package:analyzer_utilities/extensions/string.dart';
 import 'package:analyzer_utilities/messages.dart';
 import 'package:analyzer_utilities/tools.dart';
 import 'package:collection/collection.dart';
-import 'package:path/path.dart';
 
 import 'error_code_info.dart';
 
 Future<void> main() async {
   await GeneratedContent.generateAll(pkg_root.packageRoot, allTargets);
-
-  _SyntacticErrorGenerator().printSummary();
 }
 
 /// A list of all targets generated by this code generator.
@@ -297,88 +293,3 @@ import 'package:analyzer/src/pubspec/pubspec_warning_code.dart';
     );
   }
 }
-
-class _SyntacticErrorGenerator {
-  final String errorConverterSource;
-  final String parserSource;
-
-  factory _SyntacticErrorGenerator() {
-    String frontEndSharedPkgPath = normalize(
-      join(pkg_root.packageRoot, '_fe_analyzer_shared'),
-    );
-
-    String errorConverterSource = File(
-      join(
-        analyzerPkgPath,
-        joinAll(posix.split('lib/src/fasta/error_converter.dart')),
-      ),
-    ).readAsStringSync();
-    String parserSource = File(
-      join(
-        frontEndSharedPkgPath,
-        joinAll(posix.split('lib/src/parser/parser.dart')),
-      ),
-    ).readAsStringSync();
-
-    return _SyntacticErrorGenerator._(errorConverterSource, parserSource);
-  }
-
-  _SyntacticErrorGenerator._(this.errorConverterSource, this.parserSource);
-
-  void printSummary() {
-    // Build a map of error message to ParserErrorCode
-    var messageToName = <String, String>{};
-    for (var entry in analyzerMessages['ParserErrorCode']!.entries) {
-      String message = entry.value.problemMessage.replaceAll(
-        placeholderPattern,
-        '',
-      );
-      messageToName[message] = entry.key;
-    }
-
-    String messageFromEntryTemplate(ErrorCodeInfo entry) {
-      String problemMessage = entry.problemMessage;
-      String message = problemMessage.replaceAll(RegExp(r'#\w+'), '');
-      return message;
-    }
-
-    // Remove entries that have already been translated
-    for (ErrorCodeInfo entry
-        in sharedToAnalyzerErrorCodeTables.infoToAnalyzerCode.keys) {
-      messageToName.remove(messageFromEntryTemplate(entry));
-    }
-
-    // Print the # of autogenerated ParserErrorCodes.
-    print(
-      '${messageToName.length} of '
-      '${sharedToAnalyzerErrorCodeTables.infoToAnalyzerCode.length} ParserErrorCodes generated.',
-    );
-
-    // List the ParserErrorCodes that could easily be auto generated
-    // but have not been already.
-    var analyzerToFasta = <String, List<String>>{};
-    frontEndMessages.forEach((fastaName, entry) {
-      var analyzerName = messageToName[messageFromEntryTemplate(entry)];
-      if (analyzerName != null) {
-        analyzerToFasta
-            .putIfAbsent(analyzerName, () => <String>[])
-            .add(fastaName);
-      }
-    });
-    if (analyzerToFasta.isNotEmpty) {
-      print('');
-      print('The following ParserErrorCodes could be auto generated:');
-      for (String analyzerName in analyzerToFasta.keys.toList()..sort()) {
-        List<String> fastaNames = analyzerToFasta[analyzerName]!;
-        if (fastaNames.length == 1) {
-          print('  $analyzerName = ${fastaNames.first}');
-        } else {
-          print('  $analyzerName = $fastaNames');
-        }
-      }
-      if (analyzerToFasta.length > 3) {
-        print('  ${analyzerToFasta.length} total');
-      }
-    }
-  }
-}