blob: 54bbe13925d5f04ee15f2134eed8fd71b3f91797 [file] [log] [blame]
// Copyright (c) 2019, 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:analyzer/dart/ast/ast.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 ExchangeOperands extends CorrectionProducer {
@override
AssistKind get assistKind => DartAssistKind.EXCHANGE_OPERANDS;
@override
Future<void> compute(ChangeBuilder builder) async {
// check that user invokes quick assist on binary expression
if (node is! BinaryExpression) {
return;
}
var binaryExpression = node as BinaryExpression;
// prepare operator position
if (!isOperatorSelected(binaryExpression)) {
return;
}
// add edits
var leftOperand = binaryExpression.leftOperand;
var rightOperand = binaryExpression.rightOperand;
// find "wide" enclosing binary expression with same operator
while (binaryExpression.parent is BinaryExpression) {
var newBinaryExpression = binaryExpression.parent as BinaryExpression;
if (newBinaryExpression.operator.type != binaryExpression.operator.type) {
break;
}
binaryExpression = newBinaryExpression;
}
// exchange parts of "wide" expression parts
var leftRange = range.startEnd(binaryExpression, leftOperand);
var rightRange = range.startEnd(rightOperand, binaryExpression);
// maybe replace the operator
var operator = binaryExpression.operator;
// prepare a new operator
String newOperator;
var operatorType = operator.type;
if (operatorType == TokenType.LT) {
newOperator = '>';
} else if (operatorType == TokenType.LT_EQ) {
newOperator = '>=';
} else if (operatorType == TokenType.GT) {
newOperator = '<';
} else if (operatorType == TokenType.GT_EQ) {
newOperator = '<=';
}
await builder.addDartFileEdit(file, (builder) {
builder.addSimpleReplacement(leftRange, getRangeText(rightRange));
builder.addSimpleReplacement(rightRange, getRangeText(leftRange));
// Optionally replace the operator.
if (newOperator != null) {
builder.addSimpleReplacement(range.token(operator), newOperator);
}
});
}
/// Return an instance of this class. Used as a tear-off in `FixProcessor`.
static ExchangeOperands newInstance() => ExchangeOperands();
}