blob: 767c412f6c7316feba29298f70dc33149c83365b [file] [log] [blame]
// 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.
import 'package:analysis_server/src/services/correction/assist.dart';
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/assist/assist.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 ConvertToExpressionFunctionBody extends CorrectionProducer {
@override
AssistKind get assistKind => DartAssistKind.CONVERT_INTO_EXPRESSION_BODY;
@override
FixKind get fixKind => DartFixKind.CONVERT_INTO_EXPRESSION_BODY;
@override
Future<void> compute(ChangeBuilder builder) async {
// prepare current body
var body = getEnclosingFunctionBody();
if (body is! BlockFunctionBody || body.isGenerator) {
return;
}
// prepare return statement
List<Statement> statements = (body as BlockFunctionBody).block.statements;
if (statements.length != 1) {
return;
}
var onlyStatement = statements.first;
// prepare returned expression
Expression returnExpression;
if (onlyStatement is ReturnStatement) {
returnExpression = onlyStatement.expression;
} else if (onlyStatement is ExpressionStatement) {
returnExpression = onlyStatement.expression;
}
if (returnExpression == null) {
return;
}
// Return expressions can be quite large, e.g. Flutter build() methods.
// It is surprising to see this Quick Assist deep in the function body.
if (selectionOffset >= returnExpression.offset) {
return;
}
await builder.addDartFileEdit(file, (builder) {
builder.addReplacement(range.node(body), (builder) {
if (body.isAsynchronous) {
builder.write('async ');
}
builder.write('=> ');
builder.write(utils.getNodeText(returnExpression));
if (body.parent is! FunctionExpression ||
body.parent.parent is FunctionDeclaration) {
builder.write(';');
}
});
});
}
/// Return an instance of this class. Used as a tear-off in `FixProcessor`.
static ConvertToExpressionFunctionBody newInstance() =>
ConvertToExpressionFunctionBody();
}