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

// Copyright (c) 2020, 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.

// @dart = 2.9

import 'package:analysis_server/src/services/correction/dart/abstract_producer.dart';
import 'package:analysis_server/src/services/correction/fix.dart';
import 'package:analyzer/dart/ast/ast.dart';
import 'package:analyzer_plugin/utilities/change_builder/change_builder_core.dart';
import 'package:analyzer_plugin/utilities/fixes/fixes.dart';
import 'package:analyzer_plugin/utilities/range_factory.dart';

class ConvertToOnType extends CorrectionProducer {
  @override
  final List<Object> fixArguments = [];

  @override
  FixKind get fixKind => DartFixKind.CONVERT_TO_ON_TYPE;

  @override
  Future<void> compute(ChangeBuilder builder) async {
    var exceptionParameter = node;
    if (exceptionParameter is SimpleIdentifier) {
      var catchClause = exceptionParameter.parent;
      if (catchClause is CatchClause &&
          catchClause.exceptionType == null &&
          catchClause.exceptionParameter == exceptionParameter) {
        var exceptionTypeName = exceptionParameter.name;
        fixArguments.add(exceptionTypeName);
        await builder.addDartFileEdit(file, (builder) {
          if (catchClause.stackTraceParameter != null) {
            builder.addSimpleReplacement(
              range.startStart(
                catchClause.catchKeyword,
                catchClause.stackTraceParameter,
              ),
              'on $exceptionTypeName catch (_, ',
            );
          } else {
            builder.addSimpleReplacement(
              range.startEnd(
                catchClause.catchKeyword,
                catchClause.rightParenthesis,
              ),
              'on $exceptionTypeName',
            );
          }
        });
      }
    }
  }

  /// Return an instance of this class. Used as a tear-off in `FixProcessor`.
  static ConvertToOnType newInstance() => ConvertToOnType();
}