blob: 08cb4f8be65da1e6035ee420f9c7e148e0051cbf [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/dart/abstract_producer.dart';
import 'package:analysis_server/src/services/correction/fix.dart';
import 'package:analyzer/dart/ast/ast.dart';
import 'package:analyzer/dart/element/type.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 CreateLocalVariable extends CorrectionProducer {
String _variableName;
@override
List<Object> get fixArguments => [_variableName];
@override
FixKind get fixKind => DartFixKind.CREATE_LOCAL_VARIABLE;
@override
Future<void> compute(ChangeBuilder builder) async {
if (node is! SimpleIdentifier) {
return;
}
SimpleIdentifier nameNode = node;
_variableName = nameNode.name;
// if variable is assigned, convert assignment into declaration
if (node.parent is AssignmentExpression) {
AssignmentExpression assignment = node.parent;
if (assignment.leftHandSide == node &&
assignment.operator.type == TokenType.EQ &&
assignment.parent is ExpressionStatement) {
await builder.addDartFileEdit(file, (builder) {
builder.addSimpleInsertion(node.offset, 'var ');
});
return;
}
}
// prepare target Statement
var target = node.thisOrAncestorOfType<Statement>();
if (target == null) {
return;
}
var prefix = utils.getNodePrefix(target);
// compute type
var type = inferUndefinedExpressionType(node);
if (!(type == null || type is InterfaceType || type is FunctionType)) {
return;
}
// build variable declaration source
await builder.addDartFileEdit(file, (builder) {
builder.addInsertion(target.offset, (builder) {
builder.writeLocalVariableDeclaration(_variableName,
nameGroupName: 'NAME', type: type, typeGroupName: 'TYPE');
builder.write(eol);
builder.write(prefix);
});
builder.addLinkedPosition(range.node(node), 'NAME');
});
}
/// Return an instance of this class. Used as a tear-off in `FixProcessor`.
static CreateLocalVariable newInstance() => CreateLocalVariable();
}