blob: 114f8d8c4f7d2506b37eda12c0b22fb2ce46828a [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/util.dart';
import 'package:analyzer/dart/ast/ast.dart';
import 'package:analyzer/dart/ast/precedence.dart';
import 'package:analyzer/dart/ast/token.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/range_factory.dart';
class ConvertIntoIsNot extends CorrectionProducer {
@override
AssistKind get assistKind => DartAssistKind.CONVERT_INTO_IS_NOT;
@override
Future<void> compute(ChangeBuilder builder) async {
// Find the is expression
var isExpression = node.thisOrAncestorOfType<IsExpression>();
if (isExpression == null) {
var node = this.node;
if (node is PrefixExpression) {
var operand = node.operand;
if (operand is ParenthesizedExpression &&
operand.expression is IsExpression) {
isExpression = operand.expression as IsExpression;
}
} else if (node is ParenthesizedExpression &&
node.expression is IsExpression) {
isExpression = node.expression as IsExpression;
}
}
if (isExpression == null) {
return;
}
if (isExpression.notOperator != null) {
return;
}
// prepare enclosing ()
var parent = isExpression.parent;
if (parent is! ParenthesizedExpression) {
return;
}
var parExpression = parent as ParenthesizedExpression;
// prepare enclosing !()
var parent2 = parent.parent;
if (parent2 is! PrefixExpression) {
return;
}
var prefExpression = parent2 as PrefixExpression;
if (prefExpression.operator.type != TokenType.BANG) {
return;
}
await builder.addDartFileEdit(file, (builder) {
if (getExpressionParentPrecedence(prefExpression) >=
Precedence.relational) {
builder.addDeletion(range.token(prefExpression.operator));
} else {
builder.addDeletion(
range.startEnd(prefExpression, parExpression.leftParenthesis));
builder.addDeletion(
range.startEnd(parExpression.rightParenthesis, prefExpression));
}
builder.addSimpleInsertion(isExpression.isOperator.end, '!');
});
}
/// Return an instance of this class. Used as a tear-off in `AssistProcessor`.
static ConvertIntoIsNot newInstance() => ConvertIntoIsNot();
}