blob: 62037ee038de424e12901cdc39601084bc1b4391 [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/dart/abstract_producer.dart';
import 'package:analysis_server/src/services/correction/fix.dart';
import 'package:analyzer/dart/ast/ast.dart';
import 'package:analyzer/dart/ast/token.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 RemoveUnusedParameter extends CorrectionProducer {
@override
FixKind get fixKind => DartFixKind.REMOVE_UNUSED_PARAMETER;
@override
Future<void> compute(ChangeBuilder builder) async {
if (node is FormalParameter) {
var parameter = node as FormalParameter;
if (parameter.parent is DefaultFormalParameter) {
parameter = parameter.parent;
}
var parameterList = parameter.parent as FormalParameterList;
var parameters = parameterList.parameters;
var index = parameters.indexOf(parameter);
await builder.addDartFileEdit(file, (builder) {
if (index == 0) {
// Remove the first parameter in the list.
if (parameters.length == 1) {
// There is only one parameter. By removing everything inside the
// parentheses we also remove any square brackets or curly braces.
builder.addDeletion(range.endStart(
parameterList.leftParenthesis, parameterList.rightParenthesis));
} else {
var following = parameters[1];
if (parameter.isRequiredPositional &&
!following.isRequiredPositional) {
// The parameter to be removed and the following parameter are not
// of the same kind, so there is a delimiter between them that we
// can't delete.
var leftDelimiter = parameterList.leftDelimiter;
if (leftDelimiter != null) {
builder.addDeletion(range.startStart(parameter, leftDelimiter));
} else {
// Invalid code `C(foo, bar = 1)`.
builder.addDeletion(range.startStart(parameter, following));
}
} else {
// The parameter to be removed and the following parameter are of
// the same kind, so there is no delimiter between them.
builder.addDeletion(range.startStart(parameter, following));
}
}
} else {
var preceding = parameters[index - 1];
if (preceding.isRequiredPositional &&
!parameter.isRequiredPositional) {
// The parameter to be removed and the preceding parameter are not
// of the same kind, so there is a delimiter between them.
if (index == parameters.length - 1) {
// The parameter to be removed is the only parameter between the
// delimiters, so remove the delimiters with the parameter.
var trailingToken = parameterList.rightParenthesis;
if (trailingToken.previous.type == TokenType.COMMA) {
// Leave the trailing comma if there is one.
trailingToken = trailingToken.previous;
}
builder.addDeletion(range.endStart(preceding, trailingToken));
} else {
// The parameter to be removed is the first inside the delimiters
// but the delimiters should be left.
var following = parameters[index + 1];
builder.addDeletion(range.startStart(parameter, following));
}
} else {
// The parameter to be removed and the preceding parameter are of
// the same kind, so there is no delimiter between them.
builder.addDeletion(range.endEnd(preceding, parameter));
}
}
});
}
}
/// Return an instance of this class. Used as a tear-off in `FixProcessor`.
static RemoveUnusedParameter newInstance() => RemoveUnusedParameter();
}