blob: 98edb9b496a7bb2a10b7a630da2697c1b5e1dba2 [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:_fe_analyzer_shared/src/scanner/token.dart';
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/search/hierarchy.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/range_factory.dart';
class ConvertIntoIsNotEmpty extends CorrectionProducer {
@override
AssistKind get assistKind => DartAssistKind.CONVERT_INTO_IS_NOT_EMPTY;
@override
Future<void> compute(ChangeBuilder builder) async {
// prepare "expr.isEmpty"
AstNode isEmptyAccess;
SimpleIdentifier isEmptyIdentifier;
if (node is SimpleIdentifier) {
var identifier = node as SimpleIdentifier;
var parent = identifier.parent;
// normal case (but rare)
if (parent is PropertyAccess) {
isEmptyIdentifier = parent.propertyName;
isEmptyAccess = parent;
}
// usual case
if (parent is PrefixedIdentifier) {
isEmptyIdentifier = parent.identifier;
isEmptyAccess = parent;
}
}
if (isEmptyIdentifier == null) {
return;
}
// should be "isEmpty"
var propertyElement = isEmptyIdentifier.staticElement;
if (propertyElement == null || 'isEmpty' != propertyElement.name) {
return;
}
// should have "isNotEmpty"
var propertyTarget = propertyElement.enclosingElement;
if (propertyTarget == null ||
getChildren(propertyTarget, 'isNotEmpty').isEmpty) {
return;
}
// should be in PrefixExpression
if (isEmptyAccess.parent is! PrefixExpression) {
return;
}
var prefixExpression = isEmptyAccess.parent as PrefixExpression;
// should be !
if (prefixExpression.operator.type != TokenType.BANG) {
return;
}
await builder.addDartFileEdit(file, (builder) {
builder.addDeletion(
range.startStart(prefixExpression, prefixExpression.operand));
builder.addSimpleReplacement(range.node(isEmptyIdentifier), 'isNotEmpty');
});
}
/// Return an instance of this class. Used as a tear-off in `AssistProcessor`.
static ConvertIntoIsNotEmpty newInstance() => ConvertIntoIsNotEmpty();
}