| // 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. |
| |
| import 'package:analyzer/dart/ast/ast.dart'; |
| import 'package:analyzer/dart/ast/visitor.dart'; |
| |
| import '../analyzer.dart'; |
| |
| const _desc = r'Sort constructor declarations before other members.'; |
| |
| const _details = r''' |
| |
| **DO** sort constructor declarations before other members. |
| |
| **GOOD:** |
| ``` |
| abstract class Animation<T> { |
| const Animation(this.value); |
| double value; |
| void addListener(VoidCallback listener); |
| } |
| ``` |
| |
| **BAD:** |
| ``` |
| abstract class Visitor { |
| double value; |
| visitSomething(Something s); |
| Visitor(); |
| } |
| ``` |
| |
| '''; |
| |
| class SortConstructorsFirst extends LintRule implements NodeLintRule { |
| SortConstructorsFirst() |
| : super( |
| name: 'sort_constructors_first', |
| description: _desc, |
| details: _details, |
| group: Group.style); |
| |
| @override |
| void registerNodeProcessors( |
| NodeLintRegistry registry, LinterContext context) { |
| final visitor = _Visitor(this); |
| registry.addClassDeclaration(this, visitor); |
| } |
| } |
| |
| class _Visitor extends SimpleAstVisitor<void> { |
| final LintRule rule; |
| |
| _Visitor(this.rule); |
| |
| @override |
| void visitClassDeclaration(ClassDeclaration node) { |
| // Sort members by offset. |
| final members = node.members.toList() |
| ..sort((ClassMember m1, ClassMember m2) => m1.offset - m2.offset); |
| |
| var other = false; |
| for (var member in members) { |
| if (member is ConstructorDeclaration) { |
| if (other) { |
| rule.reportLint(member.returnType); |
| } |
| } else { |
| other = true; |
| } |
| } |
| } |
| } |