more fasta event cleanup and testing

pkg/analyzer/lib/src/fasta/ast_builder.dart

 // Copyright (c) 2016, 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.
 
 library fasta.analyzer.ast_builder;
 
 import 'package:analyzer/analyzer.dart';
 import 'package:analyzer/dart/ast/ast_factory.dart' show AstFactory;
 import 'package:analyzer/dart/ast/standard_ast_factory.dart' as standard;
 import 'package:analyzer/dart/ast/token.dart' as analyzer show Token;
@@ skipping 933 matching lines @@
     exitBreakTarget();
     exitLocalScope();
     List<SwitchMember> members =
         membersList?.expand((members) => members)?.toList() ?? <SwitchMember>[];
     push(leftBracket);
     push(members);
     push(rightBracket);
   }
 
   @override
-  void handleSwitchCase(
-      int labelCount,
-      int expressionCount,
-      Token defaultKeyword,
-      int statementCount,
-      Token firstToken,
-      Token endToken) {
+  void endSwitchCase(int labelCount, int expressionCount, Token defaultKeyword,
+      int statementCount, Token firstToken, Token endToken) {
     debugEvent("SwitchCase");
     List<Statement> statements = popList(statementCount);
     List<SwitchMember> members = popList(expressionCount) ?? [];
     List<Label> labels = popList(labelCount);
     if (defaultKeyword != null) {
       members.add(ast.switchDefault(
           <Label>[], defaultKeyword, defaultKeyword.next, <Statement>[]));
     }
     members.last.statements.addAll(statements);
     members.first.labels.addAll(labels);
@@ skipping 1050 matching lines @@
       } else if (identical('var', s)) {
         finalConstOrVarKeyword = token;
       } else if (identical('covariant', s)) {
         covariantKeyword = token;
       } else {
         unhandled("$s", "modifier", token.charOffset, null);
       }
     }
   }
 }