| // Copyright (c) 2016, 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. |
| |
| library linter.src.rules.sort_unnamed_constructors_first; |
| |
| import 'package:analyzer/dart/ast/ast.dart'; |
| import 'package:analyzer/dart/ast/visitor.dart'; |
| import 'package:linter/src/linter.dart'; |
| |
| const desc = r'Sort unnamed constructor declarations first'; |
| |
| const details = r''' |
| **DO** sort unnamed constructor declarations first, before named ones. |
| |
| **Good:** |
| ``` |
| abstract class CancelableFuture<T> implements Future<T> { |
| factory CancelableFuture(computation()) => ... |
| factory CancelableFuture.delayed(Duration duration, [computation()]) => ... |
| ... |
| } |
| ``` |
| |
| **Bad:** |
| ``` |
| class _PriorityItem { |
| factory _PriorityItem.forName(bool isStatic, String name, _MemberKind kind) => ... |
| _PriorityItem(this.isStatic, this.kind, this.isPrivate); |
| ... |
| } |
| |
| ``` |
| '''; |
| |
| class SortUnnamedConstructorsFirst extends LintRule { |
| SortUnnamedConstructorsFirst() |
| : super( |
| name: 'sort_unnamed_constructors_first', |
| description: desc, |
| details: details, |
| group: Group.style); |
| |
| @override |
| AstVisitor getVisitor() => new Visitor(this); |
| } |
| |
| class Visitor extends SimpleAstVisitor { |
| final LintRule rule; |
| Visitor(this.rule); |
| |
| @override |
| visitClassDeclaration(ClassDeclaration decl) { |
| // Sort members by offset. |
| List<ClassMember> members = decl.members.toList() |
| ..sort((ClassMember m1, ClassMember m2) => m1.offset - m2.offset); |
| |
| bool seenConstructor = false; |
| for (ClassMember member in members) { |
| if (member is ConstructorDeclaration) { |
| if (member.name == null) { |
| if (seenConstructor) { |
| rule.reportLint(member.returnType); |
| } |
| } else { |
| seenConstructor = true; |
| } |
| } |
| } |
| } |
| } |